Odor Absorbers and Odor Control Additives: 6 Types, Mechanisms, Dosage and Selection

Odor control additives are substances compounded into a plastic to bind, trap or chemically react with the volatile compounds that make it smell, and the largest single use is post-consumer recyclate. Martijn Roosen and colleagues at Ghent University counted 169 odorous compounds on post-consumer plastic packaging in 2021, so which additive chemistries take them out? The strongest published counter-measure inside a real recyclate is mineral: 4 wt% of a zeolite cut the average odour intensity of mixed polyolefin waste by 45 % in the 2023 study by Emilia Garofalo and Loredana Incarnato at the University of Salerno.

Six approaches reach the market under that label: chemisorbing zinc salts such as zinc ricinoleate, physisorbing minerals such as zeolites and activated carbon, inclusion hosts such as the cyclodextrins, reactive scavengers such as anthranilamide, masking fragrances, and antimicrobial odor control built on product-type 9 biocides. The last two change what a nose registers without taking a single odorant out of the article.

This page sets out where the odor comes from, how an absorber binds an odorant, the 6 types with their identity data, which polymers need one, what the record holds on dosage, 7 selection steps, formulation interactions, measurement under VDA 270 and VDA 278, the EU food-contact and biocidal rules, the suppliers, and the complete substance list held in the plastic additives database.

The table below compares the 6 approaches on mechanism, chemistry, main case, food-contact route and the question that separates them: does it remove the odorant?

Approaches 5 and 6 are sold under the same commercial label but do not remove odorants. The distinction is set out in the next section.

What Is an Odor Absorber in Plastics?#

An odor absorber is a plastic additive that binds volatile malodorous compounds inside the polymer, either by physical adsorption in a porous mineral, by chemisorption at a metal centre, by inclusion in a molecular cavity or by an irreversible chemical reaction. The additive does not destroy the smell in the air around the article: it lowers the quantity of odorant free to leave the polymer and reach a nose, which is why every claim on this page is tied to a measurement of the volatile load rather than to an impression.

The commercial vocabulary is wider than the mechanism. Odor absorber, odor scavenger, odour neutraliser, deodorising masterbatch, anti-odor additive and VOC reduction additive all appear on supplier pages for products that work in at least four ways, and odor control is one of the 43 families of plastic additives catalogued in this reference. Which products sold as odor control additives bind nothing? Two: a masking fragrance adds a second smell over the first, and an antimicrobial additive stops bacteria producing odorants rather than removing those that exist.

Absorb, react, mask or prevent: which term is correct?#

Four different jobs are sold as odor control: physical adsorption, chemical reaction, masking with a fragrance and preventing bacteria from producing odour in the first place, and only the first two take the odorant out of the article. The distinction matters commercially as well as technically, because one masterbatch producer markets its range explicitly against masking, and a buyer who cannot tell the four apart cannot compare two quotations.

Masking is not a failure, it is a different product. A fragrance masterbatch changes the perceived smell of an article without lowering its volatile load, so a VDA 278 VOC measurement taken before and after the fragrance is added returns the same value. Antimicrobial odor control is different again in law: Annex V of Regulation (EU) No 528/2012, the Biocidal Products Regulation, defines product-type 9 as fibre, leather, rubber and polymerised materials preservatives and explicitly includes products that antagonise the settlement of micro-organisms on surfaces and so prevent the development of odour. An additive that works that way is a biocidal active with its own approval route, not an absorber.

Where the Odor of a Plastic Comes From#

A plastic smells for four reasons: residues of what the article previously contained, volatile products of thermal and oxidative degradation, degradation products of the additives themselves, and residual monomers or process chemicals. An additive is the right answer to only some of them. Martijn Roosen and colleagues at Ghent University put the scale of the first on record in 2021, identifying 169 odorous compounds on post-consumer plastic packaging, mostly alkanes, terpenes and oxygenated compounds.

The third source is the one formulators overlook, because the odor comes out of the stabiliser package rather than out of the waste. Qian and colleagues measured 2,4-di-tert-butylphenol at up to 45.6 mg/kg in BOPP and LDPE products in 2018, and the compound is a degradation product of a phosphite from the antioxidants for plastics package rather than a contaminant from the previous contents. PET adds a fourth case of its own: photo-oxidation by the Norrish type II route yields acetaldehyde, so the polymer manufactures its own odorant without any help from waste or from an additive.

The table below maps the four sources against what each releases, where it dominates and what removes it.

Which compounds cause the odor of recycled plastics?#

The odor of recycled polyolefins comes from the packaging's former contents more than from the polymer: Martijn Roosen and colleagues at Ghent University identified 169 odorous compounds on post-consumer plastic packaging, mostly alkanes, terpenes and oxygenated compounds. A second Ghent University survey, published in Chemosphere in 2023, counted 203 VOCs on food flexible packaging bales against 142 on non-food, with the highest load on chilled convenience food packaging.

The four contributors to a recyclate odor are listed below.

• Food residues and their oxidation products, which dominate on food packaging bales.
• Degradation products of the polymer and of a consumed stabiliser package: aldehydes, ketones and carboxylic acids formed during each reprocessing pass.
• Inks, labels, adhesives and coating residues from the printed film surface.
• Foreign polymers and contaminants that survive sorting and add their own volatile profile.

The same work modelled what sorting alone could deliver: excluding the categories with the highest volatile load could cut VOC content by 56 % across 17 packaging categories, a projection rather than a line result. The stream-by-stream picture is on odor removal and odor absorbers for recycled plastics.

Does the smell come from the polymer or from what the packaging held?#

The contents dominate: post-consumer film bales from food packaging carried 203 volatile compounds against 142 on non-food packaging in the Ghent University survey, with chilled convenience food packaging the worst category. The gap of 61 compounds between the two bale types is contamination, not polymer chemistry, and it is the reason washing and sorting come before any additive decision.

The polymer contributes through its own degradation once the antioxidant package is consumed, which is why a third-pass recyclate smells stronger than a first-pass one at the same contamination level. PET is the named exception in the other direction. Acetaldehyde forms in PET by the polymer's own chemistry, so a PET bottle can develop an off-taste without ever having held anything but water.

How does an odor absorber work? Adsorption, chemisorption and inclusion#

An odor absorber works in 4 steps: the odorant diffuses through the melt or the solid polymer to the additive particle, it is held there by physical adsorption, by chemisorption at a metal centre or inside a molecular cavity, it stops partitioning into the air above the article, and in the reactive case it is chemically bound and can never be released.

1. Diffuse. The odorant travels through the matrix, quickly in the melt and slowly in the solid article.
2. Bind. Four chemistries capture it: physisorption in the pores of a zeolite or activated charcoal, chemisorption at the zinc of a zinc carboxylate, inclusion in a cyclodextrin cavity, or reaction with a scavenger.
3. Stop partitioning. A bound odorant no longer leaves the surface for the headspace.
4. Stay bound, or not. A chemical reaction is irreversible, while physical adsorption is reversible in principle, so behaviour at processing temperature matters.

The mechanism of the flagship chemistry is not settled: the public record describes that of zinc ricinoleate as unclear and attributes it to binding of nitrogen- and sulfur-containing odorants, such as amines and thiols, at zinc. No capacity, pore size or binding constant is on file.

Whether a physically bound odorant can come back out is the same question as additive migration in plastics, and it depends on temperature, time and the partition behaviour of the molecule. That is the practical difference between the physical and the reactive route.

6 Types of Odor Control Additives for Plastics#

Odor control additives for plastics fall into 6 types: chemisorbing zinc salts, physisorbing minerals, inclusion hosts, reactive scavengers, masking fragrances and antimicrobial odor control. The order runs from the chemistry that the distributor layer actually sells, through the only class with a measured effect in real recyclate, to the two approaches that are not absorption at all.

Grade and trade names are deliberately absent below. Several product names circulate on producer and distributor pages, none backed by a technical datasheet on file here, so this reference names companies and chemistries only.

1. Chemisorbing zinc salts: zinc ricinoleate#

Chemisorbing zinc salts are zinc carboxylates of castor-oil fatty acids, and the reference substance is zinc ricinoleate (CAS 13040-19-2), a zinc salt of ricinoleic acid with a molar mass of 660.3 g/mol. Its systematic name is zinc bis((Z,12R)-12-hydroxyoctadec-9-enoate), its EC number 235-911-4 and its formula C36H66O6Zn, and its recorded function is odor absorber.

Zinc ricinoleate is registered under REACH with 7 active full dossiers on ECHA CHEM, checked on 22 September 2026, and no Candidate List, Annex XIV, Annex XVII, FDA, POPs or TSCA entry was found on the same date. Its GHS profile is mostly not classified, with H319 in 60 % of notifications. Two things this reference cannot give are a host-polymer list and a dosage: neither exists here for the chemistry the distributor layer names most often. Its food-contact position is equally open. Ricinoleic acid holds its own Union list entry, and zinc salts of authorised acids are permitted under Article 6(3)(a) of Regulation (EU) No 10/2011 subject to the Annex II zinc limit of 5 mg/kg, but the applicability of that route to zinc ricinoleate is not confirmed.

2. Physisorbing minerals: zeolites, activated carbon and silica#

Physisorbing minerals are porous solids that hold odorants in their pore structure, and they are the only class with a measured effect in real recyclate: 4 wt% of a 13X or Z310 zeolite cut the average odour intensity of mixed polyolefin waste by 45 %. Emilia Garofalo and Loredana Incarnato at the University of Salerno melt compounded mixed polyolefin waste with the zeolite and published the result in Polymers in 2023: the additive outperformed degassing alone, and zeolite plus degassing brought film recyclate close to virgin LDPE at an average odour intensity 22 % above it.

Activated charcoal belongs to the same class and is widely used as an odor absorber in compounds that never touch food, yet its only European food-contact entry is for something else. Regulation (EU) No 10/2011 authorises it as FCM substance 713 for PET only, at a maximum of 10 mg/kg of polymer, where its technical function is reheat and infrared absorption during preform heating rather than odor control, a job covered under IR absorbers and reheat additives. Silica completes the class as a third porous carrier, and no pore size or capacity figure for any of the three is recorded here.

3. Inclusion hosts: cyclodextrins#

Inclusion hosts are ring-shaped sugar molecules whose central cavity traps a whole odorant molecule, and triacetyl-beta-cyclodextrin in electrospun LDPE fibres removed up to 90 % of dimethyl disulfide in the study collected by the 2022 cyclodextrin review in Polymers. The same work reports removal of dimethyl sulfide and carbon disulfide, which places the class against sulfur odorants specifically rather than against a broad mixed load.

The matrix limits how far that number travels. Electrospun fibres are a laboratory geometry with an extreme surface-to-volume ratio, not a moulded part, so the 90 % figure describes what the host chemistry can do under favourable access conditions. No commercial cyclodextrin odor masterbatch is documented here, and no dosage for the class in a thermoplastic compound is on file. Beta-cyclodextrin also appears as the encapsulant in capsaicin-based rodent-repellent systems, the same host chemistry in another additive family.

4. Reactive scavengers: acetaldehyde scavengers for PET#

Reactive scavengers bind the odorant chemically instead of holding it, and the reference substance is 2-aminobenzamide (anthranilamide, CAS 88-68-6), which reacts with the acetaldehyde that gives PET-bottled mineral water its off-taste. Its EC number is 201-851-2, its formula C7H8N2O and its molar mass 136.15 g/mol, it is an aromatic amide, it melts at 109 to 111.5 °C with decomposition around 110 °C, and its diffusion coefficient in PET is 4.2e-16 cm2/s at 23 °C and 4.2e-15 cm2/s at 40 °C. Reaction with acetaldehyde binds the odorant in the polymer, so it cannot be released again. The second named chemistry of this class is m-xylylenediamine.

This is the only type with a numeric European food-contact restriction: anthranilamide is FCM substance 164 (Ref 34895) of Regulation (EU) No 10/2011, with a specific migration limit of 0.05 mg/kg and use only in PET for water and beverages. It is registered under REACH with 11 active dossiers, is TSCA Active, has no 21 CFR section on record, and carries notified GHS statements H302, H315, H317, H318/H319 and H335. An oligomeric variant was assessed by EFSA in 2025 at up to 650 mg/kg in PET. The full dosing and preform data sit on acetaldehyde scavengers for PET bottles.

5. Masking fragrances and fragrance masterbatch#

Masking fragrances are scented concentrates that add a stronger, pleasant smell over the malodour, which changes what a user perceives without lowering the volatile load of the article. They reach the compounder as fragrance masterbatch and are filed in this reference inside the odor control family rather than as a family of their own.

The measurable consequence is straightforward. A VDA 278 VOC value does not fall because a fragrance was added, since the odorants that produced the original value are still in the polymer and still partitioning into the headspace. A masking product is the right choice where the specification is a user impression and the wrong choice where it is a number. No fragrance supplier, dosage or efficacy figure for the class is on file here.

6. Antimicrobial odor control: biocides against odour-forming bacteria#

Antimicrobial odor control does not remove odorants: it stops the bacteria that generate them from settling on the surface, which EU law treats as biocidal product-type 9 under Annex V of the Biocidal Products Regulation. Annex V defines product-type 9 as fibre, leather, rubber and polymerised materials preservatives and includes products that antagonise the settlement of micro-organisms on surfaces and so prevent the development of odour.

One point confuses buyers more than any other: a silver-loaded zeolite is a biocidal active with a named approval, while a plain zeolite odor absorber is not a biocide and may carry no antimicrobial claim. Silver zinc zeolite is approved for product-types 2, 7 and 9 by Implementing Regulation (EU) 2024/2635, valid from 1 March 2026 to 29 February 2036. Those actives belong to the antimicrobial additives for plastics family and carry its legal duties.

Which Plastics and Applications Need an Odor Absorber?#

An odor absorber belongs in any compound whose smell blocks the application it is meant for: recycled polyolefins first, then PET bottles for water and beverages, then automotive interior parts that have to pass an OEM odour rating. The application map here assigns odor absorbers and tracers to post-consumer PE and PP, acetaldehyde scavengers to PET bottles, and odor absorbers to automotive interiors alongside scratch and slip additives. The recyclate case is compliance-driven as well as commercial, because the recycled-content targets of the European packaging rules push more post-consumer material into packaging from 2030.

The table below matches each application to its polymer, odor source, documented approach and governing constraint.

Recycled polyolefins: rPP, rPE and post-consumer film#

Recycled polyolefins are the reason this family is growing: odour and volatile organic compounds are, in the words of the Ghent University survey, one of the main reasons why large volumes of recycled plastic currently cannot be used. Odor is one item on the longer list of additives for recycled plastics, because a recyclate arrives with less residual antioxidant, more carbonyl and hydroperoxide groups and metal contamination than virgin resin. Restabilization blends of a phenolic antioxidant with a phosphite are dosed at 0.1 to 0.3 wt% for the oxidative defect; the odour defect needs a separate additive.

The volume pressure is regulatory. Article 7 of the EU Packaging and Packaging Waste Regulation sets minimum recycled content per plastic part of packaging from 1 January 2030, at 30 % for contact-sensitive PET, 10 % for other contact-sensitive packaging, 30 % for single-use plastic beverage bottles and 35 % for other packaging, with higher figures from 2040, and applies from 12 August 2026. Those recycled-content targets of the EU Packaging and Packaging Waste Regulation (PPWR) put more post-consumer material into packaging whose smell a consumer will notice.

PET bottles: acetaldehyde and off-taste in mineral water#

PET is the one polymer that generates its own odorant: acetaldehyde forms in the resin and is detectable as an off-taste in bottled water at 10 to 20 parts per billion. The documented formation route here is photo-oxidation, where the Norrish type II pathway yields acetaldehyde, and no generation rate per processing temperature or residence time is on file. The consequence is a taste problem rather than a smell problem, most visible in still mineral water, where nothing else masks it.

The reactive scavenger route was built for this case. A patent range of 200 to 500 ppm is claimed for effective scavengers, and at 500 ppm anthranilamide gave a 71 % acetaldehyde reduction in screening; industrial preforms held 1.25 ppm against 7.5 ppm in the control, and bottled water after 52 days held 5 ppb against 79 ppb. Those figures come from the scavenger literature and the patent record, not from a supplier specification. The rest of the bottle package is set out under additives for PET resin.

Automotive interiors: VDA 270 odour and VDA 278 VOC#

Automotive interiors are graded on smell: VDA 270 puts a sample in a closed vessel at 80 °C for 2 hours and a trained panel rates the result from 1, not perceptible, to 6, intolerable. VDA 278 sits beside it, quantifying what the panel reacts to by thermal desorption GC-MS with the VOC fraction taken at 90 °C for 30 minutes and reported as toluene equivalents. Patil and colleagues screened interior materials in the Journal of Chromatography A in 2026 and found composites and foams carried the highest total VOC, up to 3,713 ng/g, with toluene dominant.

In this application the first lever is the additive package, not the absorber. Low-molecular-weight phenolic antioxidants such as BHT raise VOC emissions and fogging, which is why interior formulations move to high-molecular-weight antioxidants, polymeric plasticizers and trimellitates before anything is added to capture what remains. Odor absorbers appear in the interior package without named grades or levels, so no interior dosage is published. The whole low-emission package is compared on additives for automotive interiors.

How Much Odor Absorber Does a Compound Need? Dosage, Masterbatch and Let-Down#

No verified commercial use level for a zinc ricinoleate or zeolite odor absorber in a polyolefin compound exists in the public record, so the only defensible numbers are research levels and legal caps: 4 wt% zeolite in a laboratory study of mixed polyolefin waste, 200 to 500 ppm for an acetaldehyde scavenger in PET, and 10 mg/kg for activated charcoal in PET under FCM 713. Each belongs to a different evidence class, and none is a recommendation.

A research loading is the level at which a laboratory measured an effect in one matrix by one method. A patent range is what a claim asserts, not what a producer sells. A legal cap says nothing about what works. The nearest published polyolefin figure to a practical dosage, 0.1 to 0.3 wt% for a restabilization blend, belongs to antioxidants and not to odor absorbers, and the general conventions are on additive dosage levels in plastics. The percentage circulating on supplier and social posts for an unnamed white powder is not reproduced here, and neither is a producer claim of a 25 to 50 % odor reduction published without a method.

Research loadings are not recommendations and legal caps are not dosages. Percentages are weight of the compound unless stated otherwise.

Odor control reaches a compound almost entirely as masterbatch, which puts a second number between the buyer and the active: the let-down ratio. A masterbatch percentage is not an additive level, and converting one into the other requires the active content of the concentrate, a figure that appears on a datasheet rather than in a catalogue.

Converting a masterbatch addition rate into an active level is what the let-down ratio calculator does. This reference will publish a use-level range for zinc ricinoleate and zeolite odor absorbers in polyolefins once a producer datasheet confirms one.

How Do You Select an Odor Control Additive? 7 Steps#

Select an odor control additive in 7 steps: measure the baseline odour and volatile load, identify where the odorant comes from, exhaust washing, sorting and degassing first, match the binding mechanism to the odorant class, screen the food-contact route in every target market, decide whether an antimicrobial claim is intended, then trial and re-measure with the same method.

1. Measure the baseline. Record a VDA 270 grade, a VDA 278 VOC value or a panel result with GC-MS identification, so every later comparison uses the same method and geometry.
2. Identify the source. A contents-derived odour, a degradation odour and an additive-derived odour have different answers, and the last is solved by changing the stabiliser package.
3. Fix the upstream levers first: washing, sorting and degassing before the extruder, a lower-volatility additive package in an interior compound.
4. Match the mechanism to the odorant class: chemisorption for nitrogen- and sulfur-containing odorants, physisorption for a broad mixed load, reaction for a single molecule such as acetaldehyde.
5. Screen the food-contact route in every target market: anthranilamide is restricted to PET for water and beverages, activated charcoal to PET at 10 mg/kg, and the zinc salt route is unconfirmed.
6. Decide whether an antimicrobial claim is intended, because that turns the article into a treated article under the Biocidal Products Regulation.
7. Trial at a research-backed level and re-measure by the method of step 1, because no verified commercial use level exists for this family.

The same logic behind how to select plastic additives applies, with one difference: because the published dosage record is thin, the measurement step carries more weight here than in any other family.

How Do Odor Absorbers Work with the Rest of the Formulation?#

An odor absorber is one part of a recyclate package: restabilization restores the oxidative stability the polymer lost, a desiccant removes water, a compatibilizer handles foreign polymers, and the odor absorber deals with what is left in the melt after washing and degassing. Three measures work alongside it.

• Antioxidant blends, because a recyclate carries less residual antioxidant and more carbonyl and hydroperoxide groups than virgin resin: that side of the package is restabilization of recycled plastics at 0.1 to 0.3 wt% of phenolic plus phosphite.
• Compatibilizers, which handle the foreign polymers that survive sorting and persist into the next recycling loop.
• Degassing during compounding, which acts with the absorber rather than instead of it.

Two neighbouring products are routinely confused with an odor absorber.

• Water is a separate defect in washed feedstock, handled by a calcium oxide desiccant masterbatch that reacts with moisture rather than with an odorant, at no dosage recorded here.
• A silver-loaded zeolite is a biocide and a plain zeolite is an absorber, so confusing the two changes the legal status of the article.

The additive package can also be the odour source rather than the cure: a phosphite that generates 2,4-di-tert-butylphenol works against the odour target, and phenolics such as BHT raise VOC and fogging. No synergy or antagonism beyond these recorded relationships is claimed, and the full set of additive interactions is catalogued separately.

How Is Odor Measured? VDA 270, VDA 278, GC-MS and Sensory Panels#

Odor is measured two ways at once: a trained panel grades the smell under VDA 270 at 80 °C for 2 hours on a scale of 1 to 6, and thermal desorption GC-MS under VDA 278 quantifies the volatiles behind it at 90 °C as toluene equivalents. The two answer different questions, and a claim citing only one is incomplete. The method index for testing plastic additives lists every standard used here.

A published variant of VDA 270 places 40 g of sample in a Nalophan bag with 4 litres of nitrogen, and the Salerno study reported its result as an Average Odour Intensity rather than a VDA grade, which is why the 45 % figure here is an intensity reduction and not a grade improvement. Below the panel methods sit the identification methods: GC-MS and thermal desorption GC-MS tell a formulator which compound class to target, and py-GC-MS distinguishes an additive-derived odour from a contents-derived one. OEM odour limits vary, so no pass limit is stated as a general requirement.

How Are Odor Control Additives Regulated?#

Odor control additives are regulated in 4 layers: chemical registration under REACH, food-contact positive lists under Regulation (EU) No 10/2011, the separate recycled-plastics regime of Regulation (EU) 2022/1616, and the Biocidal Products Regulation as soon as the additive works by killing or repelling micro-organisms. The layer model is explained under plastic additive regulations, and this family sits in all four at once.

Both substances with their own pages here are registered under REACH, zinc ricinoleate with 7 active full dossiers and anthranilamide with 11, checked on ECHA CHEM on 22 September 2026. Neither appears on the Candidate List, in Annex XIV, in Annex XVII or on the POPs list checked on that date, and each statement carries that check date rather than standing as a permanent absence. No Proposition 65 status is stated for either substance.

The third layer applies to the material rather than the additive. A recycled plastic for food contact is authorised as a recycling process, with suitable and novel technologies, a public register of recyclers, installations and processes, and EFSA evaluation against a baseline misuse contamination of 3 mg/kg for PET, assessed under recycled plastics regulations independently of the odor absorber.

EU food contact: the Union list entries for odor and taste additives#

Two odor control substances hold their own entries in the EU Union list: anthranilamide is FCM substance 164 with a specific migration limit of 0.05 mg/kg and may be used only in PET for water and beverages, and activated charcoal is FCM substance 713, permitted only in PET at up to 10 mg/kg of polymer. Both values were verified against the consolidated text of Regulation (EU) No 10/2011 of 14 July 2026, and later amendments have not been checked.

The Union list mechanism is explained on EU 10/2011: a substance may be used in a food-contact plastic only if it appears in Annex I, and each entry carries its own restrictions on polymer, food type and migration. Zinc ricinoleate has no entry of its own. Ricinoleic acid appears as FCM substance 324 (Ref 83700) with a specific migration limit of 42 mg/kg under a group restriction, and Article 6(3)(a) permits zinc salts of authorised acids subject to the Annex II zinc limit of 5 mg/kg, but the applicability of that route to this salt is not confirmed. This reference therefore does not describe zinc ricinoleate as authorised for food contact.

Two generic limits apply on top of every entry: an overall migration limit of 10 mg/dm2 and a generic specific migration limit of 60 mg/kg. All specific migration limits (SML) for plastic additives are tabulated together elsewhere.

Biocidal odor control: BPR product-type 9 and treated articles#

The moment an odor claim rests on killing bacteria, the additive becomes a biocidal active: Annex V of the Biocidal Products Regulation defines product-type 9 to include products that antagonise the settlement of micro-organisms on surfaces and so prevent the development of odour. That definition separates the four absorbing types from the sixth and changes the compliance work completely.

Article 58 of Regulation (EU) No 528/2012 sets the duties: every active must be approved for the relevant product type, the label names all actives and adds "(nano)" where a nanomaterial is present, and consumer information follows on request within 45 days. Those duties for treated articles follow from that article. The United States runs a different route, the FIFRA treated-article exemption at 40 CFR 152.25(a).

The approval record is narrow. Silver zinc zeolite is approved for product-types 2, 7 and 9 by Implementing Regulation (EU) 2024/2635, valid from 1 March 2026 to 29 February 2036, with skin-contact area limits of 300 cm2 for adults and children over 2 years and 200 cm2 for toddlers and infants in non-textile polymer articles. Silver zeolite and silver copper zeolite were refused for product-types 2 and 7 by Decisions (EU) 2019/1960 and 2019/1973, upheld in T-122/20 on 16 November 2022. A plain zeolite odor absorber carries no approval and may make no antimicrobial claim.

Who Makes Odor Absorbers and Odor-Absorbing Masterbatch?#

Odor control reaches the processor almost exclusively as masterbatch, from masterbatch houses rather than from the chemical producers who make the active. That structure explains why the family is hard to compare: the buyer sees a concentrate with a brand name, and the active chemistry, its loading and its identity data sit one step upstream with a supplier who does not sell to the converter.

Six companies recorded here operate in the space, and company profiles sit in the directory of plastic additive manufacturers and suppliers. What this reference cannot yet publish is a grade list: no technical datasheet for an odor absorber or an odor-absorbing masterbatch is on file, so grade designations circulating on producer and distributor pages are not reproduced as facts, and no market size and no price for this family exists here either.

Company data comes from our source library supplier file. Grade names circulating on producer and distributor pages are not reproduced here until a technical datasheet is on file.

Complete List of Odor Control Substances (2 Pages)#

The complete list of odor control substances below gives the 2 substances documented in this reference with their own pages, with CAS and EC numbers, chemical class, mechanism and food-contact status.

Four further chemistries have no substance page of their own: activated charcoal, zeolite 13X, beta-cyclodextrin and triacetyl-beta-cyclodextrin are covered on this hub rather than in the directory. Each substance with a page carries its full regulatory matrix, physical data and supplier record in the plastic additives database.

How Does Odor Control Fit Among the Other Functional Additives?#

Odor control is 1 of the 12 functional additive families in this reference, and the group is defined by what each family adds or takes away: oxygen scavengers remove oxygen, barrier additives slow gas through the wall, antimicrobials stop micro-organisms, and odor absorbers take out the volatile compounds that reach the nose. The group also holds flame retardants, blowing agents, laser marking additives, IR absorbers, tracers, repellents, biodegradation additives and tribological additives.

Two families sit closest. Inside a package, oxygen scavengers for plastic packaging remove the oxygen that would otherwise oxidise the contents, a reactive job much like acetaldehyde scavenging. One layer out, barrier additives for plastic packaging slow the gas through the wall instead of consuming it, a physical job closer to what a zeolite does. Odor control is the only one of the three whose target is a human sense rather than a chemical species.

Is a plastics odor absorber the same as a household odor eliminator?#

No: a household odor eliminator works in the air or on a surface, while a plastics odor absorber is compounded into the melt, has to survive processing temperatures and dispersion, and, in a food-contact article, has to sit within a migration limit. The two share raw materials and almost nothing else. Activated charcoal is the clearest case: as a room deodoriser it is an unregulated consumer good, and as an additive in a food-contact plastic it is FCM substance 713, permitted only in PET at a maximum of 10 mg/kg and authorised there for reheat and infrared absorption rather than for odour.

Three constraints separate the plastics product from the household one: it must disperse in a melt without agglomerating, it must be thermally stable at compounding and moulding temperatures, and it must not migrate above a regulatory limit. A baking soda box faces none of the three, yet search results mix the two markets freely.

Can washing, degassing or better sorting replace an odor absorber?#

Partly, and the order matters: washing and sorting remove part of the load before the extruder, degassing removes another part in the melt, and the additive deals with what is left. Degassing happens during plastic compounding, before the additive has to do anything, which is why a formulator who reaches for the absorber first pays for capacity that a vacuum port would have provided more cheaply.

The published evidence puts numbers on both halves. In the Salerno study, 4 wt% zeolite in mixed polyolefin waste beat degassing alone, and the two combined brought film recyclate close to virgin LDPE at an average odour intensity 22 % above it, so they act together rather than as alternatives. On the sorting side, the Ghent University survey modelled that excluding the categories with the highest volatile load could cut VOC by 56 %, a scenario across 17 categories rather than a result achieved on a line. Washing removes part of the odorants and deodorising masterbatches are sold for the remainder.

Do odor absorbers affect recyclability and food-contact status?#

An odor absorber does not make a recyclate food-contact compliant: that is decided by Regulation (EU) 2022/1616 for the recycling process itself, and separately by the Union list status of every substance in the compound. Under that regulation a process is authorised as suitable or novel technology, recyclers, installations and processes are entered in a public register, and EFSA evaluates the process through challenge tests against a baseline misuse contamination of 3 mg/kg for PET. An additive added afterwards changes none of that.

The recyclability question runs the other way. Everything added to a recyclate stays in the next loop, which is the subject of design for recycling, so 4 wt% of a mineral absorber is 4 wt% of mineral in every later generation of that material. Neither zinc ricinoleate nor anthranilamide appears on the Candidate List, in Annex XIV, in Annex XVII or on the POPs list in the sources checked on 22 September 2026, and no Proposition 65 position is stated for either substance.