Laser Marking Additives: 6 Types, Mechanisms, Dosage and Selection

Laser marking additives are laser-absorbing particles compounded into a plastic so that it converts the beam of a 1,064 nm fibre or Nd:YAG laser into local heat, which writes a permanent dark mark by carbonization or a light mark by foaming. Polycarbonate and polystyrene carbonize on their own, while polyethylene, polypropylene, thermoplastic polyurethane and epoxy barely absorb at that wavelength, so which absorber belongs in which polymer, and how much of it? Six absorber classes answer that question, and only one substance sold specifically as a laser marking absorber carries its own entry on the European Union list for food-contact plastics.

The 6 classes, in the order used throughout this page, are antimony-based absorbers such as antimony-doped tin oxide, bismuth-based absorbers such as bismuth oxide, copper hydroxide phosphate, mica-based and effect-pigment carriers, carbon-based absorbers such as carbon black and graphene, and clay, layered-double-hydroxide and mineral boosters such as organoclay. This page separates the compounded additive from the marking process, from laser transmission welding, which is an infrared absorber job, and from laser marking spray, a surface consumable applied to finished parts.

This reference sets out the two mechanisms and the wavelength ladder behind them, describes the 6 classes with their CAS numbers and European regulatory status, matches them to polymers and applications, publishes the three measured dosage values our sources support, gives 7 selection steps, explains how contrast is measured and how colorants and flame retardants change it, and names the suppliers and substances in the family. Our source library holds research dosages and no commercial loading range here, so wherever a number is missing this page says so.

The table below compares the 6 absorber classes on example substances, the mark they produce, the host polymers our sources name, and their position under Regulation (EU) No 10/2011.

Antimony trioxide and carbon black are covered in full by their own families, flame retardants and colorants, and appear here only in their laser-marking role.

What Is a Laser Marking Additive?#

A laser marking additive is a particle compounded into a plastic that absorbs laser energy the host polymer does not absorb, usually at 1,064 nm, and converts it into local heat that carbonizes or foams the polymer around it. The same product carries five names: laser-sensitive additive and LMA in technical documentation, laser additive in compounding shorthand, laser marking pigment where the absorber is sold as a powder, and laser marking masterbatch where it arrives as a let-down concentrate. The spelling splits by region as well, since fiber laser and carbonization appear in North American documents where fibre laser and carbonisation appear in European ones.

If the laser already melts and burns plastic, why does a compound need an additive at all? Without an absorber the beam at 1,064 nm mostly passes through the part or spreads its energy across the whole surface, so the mark comes out blurred, shallow or absent. Laser marking additives are one of the 43 families of plastic additives on this site, and the only one whose job is to make a polymer respond to a machine it would otherwise ignore.

Laser marking, laser engraving and laser welding: three different jobs#

Laser marking changes the colour of the plastic without removing material, laser engraving and ablation remove material or a coating layer, and laser transmission welding uses an absorber in one of two parts so that the joint, not the surface, heats up. The three processes share an equipment family and almost nothing else. Marking needs an absorber in the compound, or at least in the skin the beam reaches; engraving needs none, because the beam removes what it hits; welding needs one only in the part that must heat at the interface.

A fourth route belongs in the same separation: a laser can remove a printed or painted top layer to expose a contrasting substrate, which is ablation of a coating rather than laser marking of a compound. Laser transmission welding uses IR absorbers and reheat additives in the absorbing part rather than a marking additive, and those materials have their own family on this site.

Laser marking spray and laser marking paste are surface consumables applied before marking, mainly on metal and ceramic. They are not compounded additives and are out of scope; see the question at the end of this page.

Which plastics mark without an additive, and which do not#

Polycarbonate and polystyrene carbonize readily enough to mark without any additive, while polyethylene, polypropylene, thermoplastic polyurethane and epoxy absorb so little at 1,064 nm that the mark is blurred or absent unless an absorber is compounded in. Cao and co-workers reported the polycarbonate and polystyrene case in ACS Omega in 2021, and Kościuszko, Czyżewski and Rojewski at Bydgoszcz University of Science and Technology reported the same division in Materials in 2021 while studying polypropylene.

Polyamide is a special case, because the colour of the compound decides the achievable contrast before the absorber does: it is commonly coloured with nigrosine and carbon black, and a dark background leaves little room for a dark mark. Flame-retardant polyamide compounds based on aluminium diethylphosphinate are described by their supplier as laser-markable, the clearest published case of an engineering compound designed to take a mark.

Absent rows are gaps in our source library, not evidence that the polymer cannot be marked.

Each polymer's full formulation package, of which the absorber is one line, sits under additives by polymer.

How Do Laser Marking Additives Work?#

Every laser marking additive works the same way in three steps: the particle absorbs photons at a wavelength the polymer transmits, it turns that energy into heat in a volume of a few micrometres, and the polymer around it either carbonizes into a dark mark or foams into a light one. The chain is the same for every absorber on this page, and the absorption efficiency and the thermal behaviour of the host decide which outcome dominates.

1. Absorb the beam at a wavelength the unfilled polymer transmits, most often 1,064 nm.
2. Convert that energy into heat inside a volume of a few micrometres around each particle.
3. Change the polymer: carbonize it into a dark residue, or foam it into light-scattering bubbles.

Carbonization: how a dark mark forms#

A dark mark is carbon: the absorber heats a few micrometres of polymer past the point where the chains break down and leave a carbon-rich residue, which is why dark marks read best on light-coloured parts. Kościuszko, Czyżewski and Rojewski described carbonization and foaming as the two laser-marking effects in Polymers in 2022, and the substance data for antimony-doped tin oxide states the same chain explicitly: the particle absorbs 1,064 nm light and heats the surrounding polymer, causing carbonization.

Contrast is a difference, not a property of the mark alone, so the background decides how much of the carbon the reader sees: a white or pale compound gives the most legible dark code, and a black compound removes the difference entirely. Our source library holds no carbonization temperature and no char yield for these systems, so this page publishes neither.

Foaming: how a light or raised mark forms#

A light mark is foam: the same local heating releases gas that freezes in as micro-bubbles, and the bubbles scatter light, so the mark appears white or grey and can be raised enough to feel. Foaming and carbonization come from one mechanism and differ in degree, which is why the laser parameters and the absorber together decide the outcome.

The light mark is the answer wherever the background is dark. A black cable jacket, a nigrosine-coloured polyamide connector and a carbon-filled housing all need one, because a dark mark would be invisible against them. A raised foamed mark also changes the surface, so the code can be read by touch as well as by a camera. A third route sits in the definition of this family, a colour change in the absorber itself rather than in the matrix around it, and that is the mechanism behind the effect-pigment carriers in class 4.

Why the wavelength decides the additive#

Industrial plastics marking runs mostly at 1,064 nm, the line of Nd:YAG and fibre lasers, and every commercial absorber class on this page is built to absorb there. Chen, Wang, Evans and O'Hare at the University of Oxford set out the laser ladder used on polymers in ACS Applied Polymer Materials in 2024: TEA CO2 lasers at 10,640 nm, Nd:YAG at 1,064, 532 and 355 nm, Nd:YVO4 at 532 and 355 nm, and excimer sources at 308, 248 and 193 nm, with 1,064 nm dominating industry.

At 10,640 nm most polymers absorb directly, so the far-infrared case is not the same absorber problem at all. In the ultraviolet the photon energy is high enough to break bonds, and UV-laser marking is the route named for fluorinated ethylene propylene in wire and cable. The absorption gap that creates this additive family is specific to the near infrared, and specifically to 1,064 nm.

Wavelengths from Chen, Wang, Evans and O'Hare, ACS Applied Polymer Materials, 2024. No absorption coefficients are published here because our source library holds none.

6 Types of Laser Marking Additives#

The 6 types of laser marking additives are antimony-based absorbers, bismuth-based absorbers, copper hydroxide phosphate, mica-based and effect-pigment carriers, carbon-based absorbers, and clay, layered-double-hydroxide and mineral boosters. The order runs from the class the literature treats as the industry reference down to the research-stage materials, and it repeats in every table, image and list on this page. Core-shell particles such as antimony-doped tin oxide in a polyimide shell are a particle-engineering format inside classes 1 and 2, not a seventh type.

1. Antimony-based absorbers (antimony-doped tin oxide, antimony trioxide)#

Antimony-based absorbers are doped metal oxides, mainly antimony-doped tin oxide and antimony trioxide, that absorb at 1,064 nm and carbonize the polymer around them. Antimony-doped tin oxide carries CAS 128221-48-7, has no EC number and appears in ECHA CHEM under list identifier A15-721-5, and its recorded mechanism is absorption of 1,064 nm light followed by heating of the surrounding polymer. Its documented use is polypropylene, as core-shell particles inside a polyimide shell, and the core-shell and dosage detail sits on antimony tin oxide.

The regulatory position splits sharply between the two substances in this class. Our ECHA CHEM query found no active REACH dossier and no food-contact entry for antimony-doped tin oxide, while the antimony limit of 0.04 mg/kg in Annex II of Regulation (EU) No 10/2011 applies to what it is made of. Antimony trioxide, CAS 1309-64-4 and EC 215-175-0, is a separate substance: it is FCM No 398 under the same 0.04 mg/kg limit, it carries a harmonised Carc. 2 H351 classification, and it is also the standard synergist for halogenated flame retardants, so its full classification and flame-retardant role are on antimony trioxide.

2. Bismuth-based absorbers (bismuth oxide, bismuth oxychloride)#

Bismuth-based absorbers are bismuth oxide and bismuth oxychloride, heavier metal oxides that absorb in the near infrared and produce dark marks, and bismuth oxide is the absorber named in the literature for thermoplastic polyurethane. Dibismuth trioxide carries CAS 1304-76-3, EC 215-134-7 and a molar mass of 465.96 g/mol, and its recorded mechanism is near-infrared absorption followed by carbonization. Bismuth oxychloride appears in the same absorber list without a substance record of its own, so it is named here and not characterised further.

Bismuth is the substitution route the industry reaches for, and the evidence does not make it the safe option. Our verification found 26 active REACH dossiers and no SVHC, Annex XIV, Annex XVII or food-contact entry, which makes it registered and unlisted rather than cleared. Lu and co-workers, in ACS Omega in 2020, call bismuth-containing and arsenic-containing oxides a toxicity concern in the same passage that flags antimony, and the identity and registration data are on bismuth oxide.

3. Copper hydroxide phosphate#

Copper hydroxide phosphate is the one dedicated laser marking absorber with its own entry on the EU Union list: it is FCM No 972, it carries no substance-specific migration limit, and the copper limit of 5 mg/kg in food applies to it. Dicopper hydroxide phosphate has the formula Cu2(OH)PO4, CAS 12158-74-6 and EC 235-285-2, and its recorded function in plastics is laser marking. PubChem lists LAZERFLAIR 8840 among its synonyms, which ties the substance directly to a commercial laser-marking line.

That entry, FCM No 972 under reference 45197 of Regulation (EU) No 10/2011, is the strongest differentiator in this family and is not a clean bill of health. Our verification found two active full REACH dossiers, and the aggregated PubChem GHS profile carries H302, H315, H319, H335, H400, H410 and H411, three of them aquatic hazards. A Union-list entry is a permission to use under stated conditions, not a claim that a compound is food safe, and the entry and the GHS profile are on copper hydroxide phosphate.

4. Mica-based and effect-pigment carriers#

Mica-based carriers are platelet mineral particles coated with an absorbing metal oxide, the construction behind most of the pearlescent and effect-pigment style laser additives on the market. The carrier mineral is mica in plastics, a platelet with an aspect ratio of 20 to 100: a thin coating spread over a large flat face absorbs far more of the beam than the same mass on a compact particle. Commercial laser-marking literature names polypropylene, polyamide, POM and PC/ABS as the polymers these carriers serve.

The coating decides everything the carrier does not, and our source library does not hold what is in it. Mica itself is FCM No 597 in Regulation (EU) No 10/2011 with no specific migration limit, and 21 CFR 178.3297 lists it as aluminium and potassium silicate. The composition of the named commercial grades, including whether the coating is antimony-based, is an open verification item and is stated nowhere here. The coated-platelet construction is the same one used by effect pigments.

5. Carbon-based absorbers (carbon black, graphene, carbon nanotubes)#

Carbon-based absorbers use the simplest chemistry in the family: carbon black, graphene and carbon nanotubes absorb across the near infrared and convert it to heat, and a study on white polypropylene produced dark marks with graphene at 50 ppm. Kościuszko and co-workers reported that 50 ppm figure in Polymers in 2022, and it is a laboratory result on a white compound rather than a supplier recommendation. Carbon black is the awkward member of this class because it does five jobs at once, and the five roles of carbon black in plastics, colorant, ultraviolet screen, conductive filler, PET reheat additive and laser absorber, are compared on its own page.

The three carbons do not share a regulatory position. Carbon black is FCM No 411 in Regulation (EU) No 10/2011 with specifications on primary particle size, 10 to 300 nm, and on toluene extractables, which must not exceed 0.1 %. Graphene carries CAS 1034343-98-0 and EC 801-282-5 with 9 active REACH dossiers in our check, and it is not on the EU Union list, where nanoforms require explicit authorisation under Article 9(2). Registration and nanoform status are on graphene.

6. Clay, LDH and mineral boosters#

Clay and layered-double-hydroxide boosters are the research edge of the family: they are cheap minerals that raise contrast rather than absorb strongly on their own. Lu and co-workers reported in ACS Omega in 2020 that organically modified montmorillonite at 1 to 8 wt% in ABS raised the colour difference ΔE from 7 to 25 at a laser current of 7 A, a research result on one polymer at one setting. Molybdenum disulfide and silica appear in the same absorber list, with MoS2 studied in polypropylene by Cao and co-workers in 2021, and the food-contact conditions for modified montmorillonite are on its own page.

The layered double hydroxides carry the most striking recent result and the one most easily over-read. Chen, Wang, Evans and O'Hare at the University of Oxford reported in ACS Applied Polymer Materials in 2024 that a Mg2Al-CO3 layered double hydroxide replaced 95 % of a commercial laser additive in epoxy while QR codes stayed readable, and that the commercial additive has particles of 50 to 200 nm and poses toxicity concerns. That 95 % is a substitution result in one epoxy system, not a general replacement ratio. The same family works as a PVC co-stabilizer and a polyolefin acid scavenger under the name hydrotalcite.

Which Polymers and Applications Use Laser Marking Additives?#

Laser marking additives exist because parts need a permanent, machine-readable identity: lot and date codes on packaging, part numbers on cable and connectors, unique device identification codes on medical devices, and durable markings on automotive safety parts. The host polymers named in commercial laser-marking literature are polypropylene, PC/ABS, polyamide and POM, and the mark can be white or dark depending on the formulation. In each case the code has to outlive handling, cleaning, sterilisation or installation.

Medical devices carry unique device identification codes, and our source library holds no legal instrument requiring them, so this page treats UDI as an application and not as a regulatory duty; device compounds are covered on additives for medical plastics. Wire and cable is where the laser reaches material nothing else will mark, including fluorinated ethylene propylene jackets marked with ultraviolet lasers, and cable identification sits inside the wider package on additives for wire and cable compounds.

Automotive interiors carry function symbols on belt buckles, pillars and knobs, where an ink legend wears off. Electrical and electronics compounds for electric-vehicle and connector applications list laser-marking additives among their requirements alongside halogen-free flame retardants and high comparative tracking index grades, the hardest case on this list: the absorber has to share the compound with a full flame-retardant package. Aluminium diethylphosphinate compounds for glass-filled PA6 and PA66 are the published example that works, with supplier-stated UL 94 V-0 from 0.4 to 3.2 mm, a glow-wire ignition temperature of 775 °C, a glow-wire flammability index of 960 °C and a comparative tracking index up to 600 V.

How Much Laser Marking Additive Does a Plastic Need?#

There is no published industry-wide dosage range for laser marking additives that we can source to a primary document, so this page gives the measured research values with their polymer and laser conditions and says plainly where the data stops. That absence is a finding rather than an omission: our sources record the missing commercial loading range as an explicit open question, and the three numbers that do exist come from three laboratories working on three polymers with three absorbers.

The loading therefore comes from the supplier's technical data sheet and from a marking trial, not from a family rule, and the families where published ranges do exist are collected on additive dosage levels.

What the published dosage evidence actually shows#

The three dosage figures our sources support span four orders of magnitude, which is the clearest evidence that loading depends on the absorber, the polymer and the laser rather than on a family rule. Fifty parts per million of graphene marked white polypropylene in one study, while 1 to 8 wt% of organoclay was needed to lift contrast in ABS in another. The third result is not a loading at all but a substitution ratio in an epoxy system.

Every one of these numbers was measured at a stated laser condition, and none of them is transferable. The organoclay range was measured at a laser current of 7 A, and the colour difference it produced, ΔE rising from 7 to 25, is meaningful only against that setting and that ABS grade. For a commercial mica-based grade our source library holds no primary dosage document at all, so the correct action is to ask the supplier for the technical data sheet rather than to scale a research value.

Every row is the condition it was measured under. None of them is a formulation recommendation.

Masterbatch, let-down and where the absorber has to sit#

Laser marking additives reach the processor as an additive masterbatch, because the active level in a part is the masterbatch concentration multiplied by the let-down ratio, and at these loadings weighing the powder directly is impractical. An additive masterbatch typically carries 40 to 65 wt% of active, with extremes from 15 to 80 wt%, and is let down at 1 to 5 % of the base polymer. A 5 % let-down is the same statement as a 19:1 ratio, and both forms appear on supplier data sheets.

The three routes by which an absorber reaches the part are listed below.

• Direct compounding. The absorber goes in at the extruder, which suits a captive compounder running one recipe at volume.
• Masterbatch let-down at the moulding machine. The concentrate meets the natural polymer in the hopper, the flexible route and the one most suppliers sell.
• Surface or skin layer only. The mark forms in the top layer the beam reaches, so in a multilayer or skin-core part the absorber only has to be where the beam lands.

Convert a masterbatch percentage into an active level with the let-down ratio calculator. Dispersion carries more weight here than in most families, because an agglomerate shows up as a speckle in the code, which makes mark quality a plastic compounding question.

How Do You Select a Laser Marking Additive? 7 Steps#

Select a laser marking additive in 7 steps: start from your laser, check whether the polymer absorbs at all, decide whether the mark is dark or light, check the base colour, screen the regulations for the end use, check the rest of the additive package, then trial it at production settings. Each step removes options the next one would otherwise have to test.

1. Start from the laser you already run. At 1,064 nm the six classes on this page apply; a CO2 or ultraviolet source changes the question entirely.
2. Check whether the polymer needs an absorber. Polycarbonate and polystyrene carbonize unaided, while polyethylene, polypropylene, TPU and epoxy need one.
3. Decide dark or light. Dark is carbonization and light or raised is foaming, and the choice drives the absorber and the laser parameters together.
4. Check the base colour and the contrast you can reach. A white compound gives the largest dark-mark contrast and a black compound almost none.
5. Screen the regulatory route for the end use. Among the dedicated absorbers only copper hydroxide phosphate holds its own Union-list entry, FCM No 972, while antimony absorbers sit under the 0.04 mg/kg limit of Annex II.
6. Check the rest of the additive package. Carbon black, titanium dioxide and a flame-retardant system all change the result, and antimony trioxide is already an absorber.
7. Run a marking trial at production parameters and record the settings with the dosage. No published dosage range exists for this family, so the trial record is the specification.

The general framework behind these steps is on how to select plastic additives. A specification that records the additive and the loading but not the laser power, speed and frequency is not reproducible, because the same compound foams at one setting and carbonizes at another.

How Do Laser Marking Additives Interact with Colorants and Other Additives?#

A laser mark is a contrast between the mark and the background, so every additive that changes colour, opacity or surface texture changes the result, and the two that matter most are carbon black and titanium dioxide. The base colour comes from the colorants for plastics already in the compound, so the colour decision precedes the absorber decision. Carbon black is the extreme case in both directions: it absorbs across the near infrared, so a black compound already contains an absorber, and it is the darkest pigment available, so a dark mark has nowhere to go. The answer for a black part is a light foamed mark.

Titanium dioxide works the other way and brings its own interaction. A white background maximises the contrast of a dark mark, which is why the published graphene result was obtained on white polypropylene, but low-treated titanium dioxide with a phenolic antioxidant produces the pinking reaction, so the whiteness that carries the mark is itself a stability question. Talc, kaolin and silica add a third effect unrelated to colour: their acid sites adsorb antioxidants and hindered amine light stabilizers.

Flame-retardant systems interact in both directions. Antimony trioxide is the standard synergist with halogen donors and sits in many flame retardants for plastics packages, so such a compound may carry an absorber before anyone specifies one. The positive case runs the other way: aluminium diethylphosphinate compounds are described by their supplier as laser-markable and laser-weldable.

How Is Laser Mark Quality Measured?#

Laser mark quality is measured as a colour difference between the mark and the untouched surface, reported as ΔE and calculated with the formulas in ASTM D2244-25. That standard covers the CIELAB, CMC, CIE94, DIN99o and CIEDE2000 formulas, which do not return the same number for one pair of colours, so a ΔE specification is incomplete until it names the formula. The ΔE formulas and the instrument geometry are explained on color measurement.

Two further properties belong in a marking specification and only one of them has a standard we can cite. Yellowness of the background is measured by ASTM E313-20; the older ASTM D1925 was withdrawn in 1995 and is never cited as current on this site. Code readability is the property customers actually buy, and our source library holds no standard for grading laser-marked barcodes or two-dimensional codes, so this page cites none and recommends agreeing acceptance criteria with the customer against the production reader. Every method this site does hold is indexed under testing plastic additives.

How Are Laser Marking Additives Regulated?#

No regulation mentions laser marking: an absorber is regulated like any other additive, as a registered chemical under REACH, as a food-contact substance under Regulation (EU) No 10/2011 where it touches food, and through the metal limits that apply to what it is made of. Three layers therefore apply at once, and the metal limits decide most cases, because five of the eight substances below are metal compounds. All the instruments are summarised in plastic additive regulations.

Status checked 22 September 2026. "No entry found" means our verification found none, not that none can exist.

Food contact: EU 10/2011 and the metal limits#

A laser marking additive used in food packaging has to be on the Union list of Regulation (EU) No 10/2011 or covered by an Article 6 route, and the metal it is made of then sets the practical limit. The framework sets a generic migration limit of 60 mg/kg and an overall migration limit of 10 mg/dm2, and Annex II adds the metal limits that bite far harder here: copper 5 mg/kg, antimony 0.04 mg/kg, zinc 5 mg/kg, iron 48 mg/kg and aluminium 1 mg/kg. The Union list and those metal limits are explained on EU 10/2011.

Four absorbers hold a Union-list position and three do not. Copper hydroxide phosphate is FCM No 972 with no substance-specific limit, so the 5 mg/kg copper limit applies; mica is FCM No 597 with no limit; carbon black is FCM No 411; modified montmorillonite is FCM No 1030 at a maximum of 12 % w/w in polyolefins for dry foods. Graphene is not on the Union list, where nanoforms require explicit authorisation under Article 9(2), and neither antimony-doped tin oxide nor dibismuth trioxide has an entry our verification could find.

A substance qualifies in the United States either by a listing in a named section of 21 CFR, such as mica under 21 CFR 178.3297, or by an effective food-contact notification, and neither is an approval of a finished compound. The US route runs through FDA food contact rules, which is why "FDA approved" is never the right phrase for an additive.

Antimony, bismuth and copper: classification and Proposition 65#

The regulatory pressure in this family sits on antimony: antimony trioxide carries a harmonised Carc. 2 classification, has been on the California Proposition 65 list for cancer since 1 October 1990, and was placed in IARC Group 2A for trivalent antimony in 2022. The harmonised entry under Regulation (EC) No 1272/2008 is Carc. 2 H351 at index number 051-005-00-X, the IARC placement appears in Monographs Volume 131 of 2022, and the ACGIH threshold limit value is 0.5 mg/m3 as antimony. The listing and the resulting warning duties are explained on Proposition 65.

Substance identity has to stay strict here, because three different statements are routinely collapsed into one. Antimony-doped tin oxide is not antimony trioxide and does not inherit its classification: our verification found no harmonised entry for it. Neither statement says anything about antimony as an element, and neither absorber is banned in plastics. Registration status under Regulation (EC) No 1907/2006 differs just as sharply, with 26 active dossiers for dibismuth trioxide, 9 for graphene, 2 full dossiers for the copper compound and none for antimony-doped tin oxide, and what registration means in practice is set out on REACH.

Bismuth and copper carry files of their own rather than a clean record. Our verification found no SVHC, Annex XIV or Annex XVII entry for dibismuth trioxide, while the literature flags bismuth-containing oxides in the same sentence as antimony. The copper compound carries three aquatic hazard statements, H400, H410 and H411, which matter for waste and effluent handling in a compounding plant rather than for the finished part. Device parts add a further layer, set out on plastic additives in medical devices.

Who Makes Laser Marking Additives? Brands and Suppliers#

Laser marking additives reach the market on two levels: a small number of speciality pigment makers produce the absorbers, and masterbatch producers compound them into carriers that a moulder can dose. The companies our research names are Merck with the Iriotec line, Avient with Cesa Laser, Americhem, Tosaf and Lifocolor, and company profiles sit in the directory of plastic additive manufacturers and suppliers.

We hold no market-size figure for laser marking additives and quote none, because our sources record the absence of primary market data for this family as an explicit open question; the figures we do hold for the additive market as a whole are on plastic additives market. This page also states no composition for any named commercial grade and names no owner for the Merck surface-solutions portfolio, both open verification items rather than settled facts.

Companies are listed because a source names them, not because they pay. We hold no market-size figure for this family and quote none.

Avient was formed as PolyOne on 31 August 2000, acquired the Clariant masterbatch business in 2020, and runs the brand lines Cesa, OnColor, ColorMatrix, Smartbatch and Hydrocerol. Tosaf runs 22 sites with about 1,600 employees in more than 50 countries.

Complete List of Laser Marking Substances (3 Pages)#

Three substances have their own page in this family, and five more act as laser absorbers or contrast boosters while belonging to another family. The table repeats identity and role only; every fact in it is sourced earlier on this page.

All eight substance pages, with their CAS numbers, functions and regulatory status, sit in the plastic additives database.

What Are the Health, Recycling and Sustainability Questions Around Laser Marking Additives?#

Two questions follow laser marking additives out of the compounding room: the heavy metals most absorbers are made of, and what a carbon-rich mark does to a part that is meant to be recycled. The heavy-metal question is documented in classification files and in the substitution literature; the recycling question is documented for colourants and not for marks, a distinction the sources make and this page keeps.

Regulation (EU) 2025/40, the Packaging and Packaging Waste Regulation, is the pressure upstream of both: it applies from 12 August 2026, its recycled-content targets start on 1 January 2030, and its design-for-recycling criteria are due by delegated act by 1 January 2028. None of those provisions names laser marking, and none is quoted here as if it did.

Why antimony is the pressure point#

Antimony is the reason this family has a substitution literature at all: antimony trioxide carries a harmonised carcinogenicity classification, sits on the California Proposition 65 list and was placed in IARC Group 2A in 2022, and the EU food-contact limit for antimony is 0.04 mg/kg. That is the tightest metal limit in play for this family by two orders of magnitude, since the copper limit governing the one Union-listed absorber is 5 mg/kg. A limit is not a prohibition, and nothing in the record makes antimony absorbers illegal in plastics.

What the record does show is a direction of travel visible in the research. The Oxford group that replaced 95 % of a commercial laser additive with a layered double hydroxide gave toxicity concerns about that additive as their motivation, and Lu and co-workers flagged bismuth-containing and arsenic-containing oxides in the same breath as antimony in 2020. The second point is the one most often lost: the substitution literature does not present bismuth as the safe alternative, it presents both metals as the problem the mineral boosters are meant to solve. No substitute here is established as safe, and none of these studies tests a finished article.

Laser marks, carbon and NIR sorting#

Near-infrared sorters read the polymer by its reflectance, and carbon absorbs there, which is why black packaging often fails sorting: the relevant question for a laser-marked part is what the whole compound contains, not what the code covers. The Association of Plastic Recyclers design guide sets the threshold in SORT-S-01 at an L value below 40 or a near-infrared reflectance of 10 % or less, and a package below that threshold is not identified. Carbon black is the cause in almost every documented case, which makes it a colourant decision rather than a marking decision.

The mark covers a small fraction of a part's surface, and our sources describe the colourant problem rather than a marking problem, so this page does not claim that laser marking makes a part unrecyclable. Where a black part has to be sortable, the answer is NIR-sortable black colorants, and a compound built for a second life needs the stabilizer package covered under additives for recycled plastics. The wider sorting rules are part of design for recycling.

Is a laser marking additive the same as laser marking spray?#

No: a laser marking additive is compounded into the plastic before the part is moulded, while laser marking spray is a surface coating applied to a finished part, most often a metal one, and the two are not interchangeable. The additive becomes part of the polymer, which is why the mark survives as long as the part does. Our source library holds no data on what marking sprays contain, how they perform or how long they last, so this page makes no claim about them beyond the definition and covers the compounded additive only.

Does laser marking replace ink, labels and pad printing?#

Laser marking replaces ink where the code has to survive the part's whole life: the mark is a change in the polymer itself, so there is nothing to rub off, dissolve or migrate. That is why it appears on medical device identification, cable part numbers, automotive safety symbols and food-packaging lot codes, and why it removes both an ink migration pathway and a consumable from the line. The limits are equally concrete: the mark is restricted to the colours the contrast allows, and the absorber has to be in the compound before the part exists, which makes it a design decision. The neighbouring identification family is tracer and anti-counterfeiting additives.