Polymeric Flame Retardants: Brominated Polystyrene, PolyFR and Polyphosphonates (5 Types Compared)

Polymeric flame retardants are flame retardants that are themselves polymers or oligomers, such as brominated polystyrene, PolyFR (molecular weight about 100,000) and poly(pentabromobenzyl acrylate) (about 600,000), built to stay in the plastic instead of blooming to the surface like small molecules such as DBDPE at 971.2 g/mol. That size difference decides how they process, how they are regulated and where they are used; so which of the 5 types fits which plastic?

Flame retardants are the third-largest group of plastic additives by weight, 13 % of additive consumption, and the polymeric grades are their high-molecular-weight branch: 4 brominated types plus the halogen-free polyphosphonates.

This page defines the class, explains why compounders choose it and how it stops a flame, compares the 5 types, matches each to glass-filled PA66, PBT, EPS and XPS foam and styrenic housings, and sets out the synergists, the fire tests and the suppliers. It also dates the regulatory position: the EU restriction of non-polymeric aromatic brominated flame retardants, mandated on 11 November 2025 with a draft Annex XV dossier planned for December 2026, leaves polymeric grades out of scope. The hub on flame retardants for plastics compares every flame-retardant family by mechanism and loading.

Four figures that define polymeric flame retardants

• 5 types: brominated polystyrene, PolyFR, poly(pentabromobenzyl acrylate) (PBB-PA), brominated epoxy oligomers and polyphosphonates
• About 100,000: the molecular weight of PolyFR (ICL FR-122P), against 641.7 g/mol for HBCD, which it replaced in EPS and XPS
• 71 wt% and 65 wt%: bromine in PBB-PA (ICL FR-1025) and PolyFR (ICL FR-122P)
• December 2026: the planned draft Annex XV dossier of the EU restriction that leaves polymeric grades out of scope

What Is a Polymeric Flame Retardant?#

A polymeric flame retardant is a flame retardant whose own molecule is a polymer or oligomer, such as brominated polystyrene, a brominated butadiene-styrene copolymer (PolyFR), poly(pentabromobenzyl acrylate), a brominated epoxy oligomer or a polyphosphonate, which is blended into another plastic to slow ignition and flame spread. The class is defined by molecular size, not by element: 4 types carry bromine and the fifth carries phosphorus.

A polymeric flame retardant is the additive; a flame-retardant polymer is the finished plastic. PEEK, PPS and aramid resist flame by their own structure, while glass-filled PA66 with 15-20 wt% of a phosphinate blend is a flame-retardant compound, and neither is a polymeric flame retardant. So what separates a polymeric grade from the other two ways a flame retardant enters a plastic?

Polymeric, additive and reactive flame retardants: what is the difference?#

Additive flame retardants are small molecules blended into the melt, reactive flame retardants are bonded into the polymer chain, and polymeric flame retardants are blended like additives but are polymers themselves, so they combine the easy compounding of the first with the low mobility of the second. The difference between additive and polymeric grades is size, not chemistry: DBDPE and brominated polystyrene both release bromine in a fire, but only the first is a molecule small enough to diffuse through the host. Table 1 compares the 3 routes.

A reactive flame retardant changes the host polymer itself, while a polymeric one leaves it unchanged, so one grade can serve 2 or more hosts, such as brominated polystyrene in PA66 and PBT. The two older categories are defined in full under reactive vs additive flame retardants.

How large is a polymeric flame retardant molecule?#

A polymeric flame retardant molecule is 100 to 600 times heavier than a small-molecule one: PolyFR has a molecular weight of about 100,000 and poly(pentabromobenzyl acrylate) about 600,000, against 971.2 g/mol for DBDPE and 641.7 g/mol for HBCD. PolyFR is therefore about 100 times heavier than DBDPE and about 150 times heavier than HBCD, as the chart at the top of this page shows on a logarithmic scale. Table 2 lists the recorded molecular weight and bromine content of each substance.

Molecular weights of commercial polymers are supplier values for one grade, not fixed constants.

Does that size make polymeric grades less efficient? Per kilogram of product, yes: they carry 65 to 71 wt% bromine against at least 82 wt% for DBDPE, so a compound needs more of them for the same bromine. Per kilogram of bromine, the flame chemistry is the same, because the released hydrogen bromide, not the molecule that carried it, traps the flame radicals.

Are ammonium polyphosphate and melamine polyphosphate polymeric flame retardants?#

Ammonium polyphosphate and melamine polyphosphate are inorganic polymers, APP phase II with chains of more than 1,000 units, but the trade classes them as phosphorus and nitrogen-phosphorus flame retardants, not as polymeric flame retardants, because the term is reserved for organic high-molecular-weight flame retardants. APP is [NH4PO3]n, CAS 68333-79-9, with 97.01 g/mol per repeat unit and decomposition from about 240 °C (464 °F); melamine polyphosphate, CAS 218768-84-4, is (C3H6N6·HPO3)n, and red phosphorus, CAS 7723-14-0, is an amorphous polymeric allotrope. Chain length and phase II grades are on ammonium polyphosphate.

Is a polyphosphonate the same as a polyphosphate?#

No: a polyphosphonate is an organic polymer with phosphorus bonded directly to carbon in its backbone, whereas a polyphosphate such as ammonium polyphosphate is an inorganic chain of phosphate units, and the two belong to different flame-retardant classes. The same phosphorus-carbon bond appears in the small liquid phosphonates DMMP and DEEP. A phosphate, polymeric or not, holds its phosphorus only through phosphorus-oxygen bonds.

Why Use Polymeric Flame Retardants? Migration, Blooming, Heat and Regulation#

Compounders choose polymeric flame retardants for 4 reasons: they do not migrate or bloom, they survive the processing heat of glass-filled PA66 and PBT, they keep connectors' tracking and ageing performance, and they sit outside the EU restriction now being prepared for non-polymeric aromatic brominated flame retardants. The 4 reasons are listed below.

1. Low migration and no blooming. A polymeric grade is designed so that its high molecular weight keeps it from blooming to the part surface, and ICL markets PBB-PA (FR-1025) as non-blooming. Diffusion of small molecules out of the matrix is explained under additive migration in plastics.
2. Stability at engineering-plastic processing temperatures. Brominated polystyrene is the thermally stable bromine source for glass-filled PA66 and PBT, and PBB-PA loses only 5 % of its weight at 330 °C (626 °F) in thermogravimetric analysis (ICL FR-1025).
3. Electrical and ageing performance in connectors. ICL markets FR-1025 for thermal ageing resistance and a high comparative tracking index (CTI).
4. A regulatory position outside the planned EU restriction. The restriction mandated on 11 November 2025 covers non-polymeric aromatic brominated flame retardants only, while DBDPE, the main small-molecule competitor, has been an SVHC (vPvB) since 5 November 2025.

The class also has costs: less bromine per kilogram than DBDPE, the same need for an antimony synergist, and a second polymer in the blend whose dispersion and compatibility with the host matter as much as its bromine. The surface crystallisation that polymeric grades avoid is covered in blooming and exudation in plastics. How, then, does a polymer stop a flame?

How Do Polymeric Flame Retardants Work?#

Polymeric brominated flame retardants work exactly like small brominated ones: the heat of a fire releases hydrogen bromide, which traps the H· and OH· radicals that keep the flame burning, and antimony trioxide multiplies the effect by forming volatile antimony bromides. Hydrogen bromide replaces the reactive H· and OH· radicals with the less reactive Br· radical, slowing combustion in the gas phase, and antimony trioxide, which has no flame-retardant effect alone, forms antimony oxybromide and then volatile antimony tribromide (SbBr3) that carries the bromine into the flame. The bromine chemistry is the same as in all brominated flame retardants, polymeric or not.

Polyphosphonates work like other phosphorus flame retardants, in 2 phases. Bernhard Schartel at the German Federal Institute for Materials Research and Testing (BAM) showed in 2010, in Materials ("Phosphorus-based flame retardancy mechanisms: old hat or a starting point?"), that phosphorus flame retardants act in the condensed phase through charring, intumescence and inorganic glassy layers, and in the gas phase through flame inhibition that lowers combustion efficiency and raises the carbon monoxide yield. No polyphosphonate-specific result is recorded in our sources, so this is the class mechanism only.

What does the polymer backbone add? Nothing to the flame chemistry: a polystyrene or butadiene-styrene backbone is itself fuel, so the bromine does the work, and the molecular weight changes where the flame retardant sits, not how it acts in the fire. The full gas-phase and condensed-phase picture is under how flame retardants work.

What Are the 5 Types of Polymeric Flame Retardants?#

The 5 types of polymeric flame retardants are brominated polystyrene, PolyFR (a brominated butadiene-styrene copolymer), poly(pentabromobenzyl acrylate), brominated epoxy oligomers and polyphosphonates; the first 4 carry bromine and need an antimony synergist, while polyphosphonates carry phosphorus and are halogen-free. Table 3 compares the 5 types.

Physical data are supplier values for the named grade. "Not recorded in our sources" means the value has not been verified against a primary source yet, not that it does not exist.

1. Brominated polystyrene (BrPS)#

Brominated polystyrene is polystyrene whose aromatic rings carry bromine, CAS 88497-56-7, sold as Saytex HP-3010 and HP-7010 by Albemarle, and it is the thermally stable bromine source for glass-filled PA66 and PBT connectors, used with antimony trioxide or zinc stannate. Its formula is (C8H8-xBrx)n, its ECHA list number 618-171-0, and inventories also name it poly(bromostyrene) or "benzene, ethenyl-, homopolymer, brominated". High-temperature polyamides are its second market, and a 2020 study in Polymers (doi 10.3390/polym12071543) examined ZnW and SnW synergists with it in PA66. Grades and the regulatory matrix are on brominated polystyrene.

Firemaster PBS-64, a historic grade, is poly(dibromostyrene), a related but distinct polymer. Brominated polystyrene competes in the same connectors with 4 alternatives: aluminium diethylphosphinate at 15-20 wt% (with MPP in glass-filled PA6 and PA66), red phosphorus in dark-coloured glass-filled PA66, DBDPE and PBB-PA. It is not on the REACH Candidate List and is outside the scope of the planned restriction of non-polymeric aromatic brominated flame retardants. The phosphinate and red-phosphorus routes for the same connectors are compared under halogen-free flame retardants.

2. PolyFR (brominated butadiene-styrene copolymer)#

PolyFR is a brominated butadiene-styrene block copolymer, CAS 1195978-93-8, with about 65 wt% bromine and a molecular weight of about 100,000, and it is the polymeric flame retardant that replaced HBCD in EPS and XPS building insulation. Its synonyms are brominated SBS and butadiene styrene brominated copolymer, and ICL's FR-122P grade softens at 120 to 140 °C (248 to 284 °F) and has a density of 1.6 g/cm3. PolyFR is sold under 3 trade names for the same CAS number.

• Emerald Innovation 3000 (LANXESS), for EPS and XPS; LANXESS also sells Emerald Innovation 5000 for polyolefins and styrenics
• FR-122P (ICL Industrial Products)
• GreenCrest (Albemarle)

Identity, grades and the HBCD comparison are on PolyFR (brominated butadiene-styrene copolymer).

HBCD is a cycloaliphatic molecule of 641.7 g/mol with 74.7 wt% bromine and a density of 2.40 g/cm3, so the switch traded a small molecule for a polymer about 150 times heavier. The substance PolyFR replaced, HBCD (hexabromocyclododecane), has been a Stockholm Convention POP since 2013. No loading level for PolyFR in polystyrene foam is recorded in our source library, and PolyFR is not on the REACH Candidate List.

3. Poly(pentabromobenzyl acrylate) (PBB-PA)#

Poly(pentabromobenzyl acrylate), PBB-PA, is a brominated polyacrylate with 71 wt% bromine and a molecular weight of about 600,000, sold by ICL as FR-1025 (CAS 59447-57-3) for glass-filled PA66 and PBT connectors. Two CAS numbers apply: 59447-57-3 identifies the polymer (ECHA list no. 639-977-9) and 59447-55-1 the monomer, pentabromobenzyl acrylate (EC 261-767-7, C10H5Br5O2, 556.7 g/mol). FR-1025 has a density of 2.50 g/cm3, softens at 190 to 220 °C (374 to 428 °F) and loses 5 % of its weight at 330 °C (626 °F), and PBB-PA is not on the REACH Candidate List. ICL markets FR-1025 for 4 properties.

• Thermal ageing resistance in electrical and electronic parts
• High comparative tracking index (CTI) in connectors
• Recyclability of the compound
• No blooming to the part surface

These are supplier claims. Identifiers for the polymer and its monomer are on poly(pentabromobenzyl acrylate).

4. Brominated epoxy oligomers (BEO)#

Brominated epoxy oligomers are short chains built from TBBPA and epichlorohydrin, CAS 68928-70-1, used as polymeric flame retardants in PBT and PET compounds and in ABS and PC/ABS housings. Its ECHA list number is 614-817-0, its synonyms include TBBPA epoxy oligomer and end-capped brominated epoxy, and it is also used in epoxy. End-capped variants carry other CAS numbers, which our sources do not yet record. Grades and CAS variants will be listed on brominated epoxy.

Does the monomer's classification carry over to the oligomer? TBBPA, the building block, has been on the REACH Candidate List since 17 January 2023 and carries a harmonised Carc. 1B classification under the CLP Regulation (EC) No 1272/2008 from 1 September 2025, but the oligomer is assessed as its own substance and is not on the Candidate List. The building block's own status is on TBBPA (tetrabromobisphenol A).

5. Polyphosphonates and other phosphorus polymers#

Polyphosphonates are organic polymers with phosphorus-carbon bonds in their backbone, the high-molecular-weight members of the phosphonate family that also includes the liquid DMMP, and they are the only halogen-free type among the 5 polymeric flame retardants. DMMP, the small relative, is a liquid phosphonate with about 25 % phosphorus used in rigid PU/PIR foam and unsaturated polyester, and DEEP completes the small-molecule end of the group. Phosphonates sit in the wider family of phosphorus flame retardants.

Grade names, loadings and regulatory data for polyphosphonates are not yet verified against primary sources in our library, so this page names the class only, with the dual-phase mechanism that Schartel (BAM, 2010) described for phosphorus flame retardants as a class.

Which other oligomeric flame retardants exist?#

Brominated carbonate oligomers based on TBBPA are a sixth, smaller group, reported for PBT compounds, and older TBBPA copolycarbonates were used in polycarbonate itself. Our sources name the type only, with no CAS number, supplier or regulatory status, so this page lists the 2 as reported uses. Both are built from TBBPA, the same building block as the brominated epoxy oligomers.

Which Polymeric Flame Retardant Suits Each Polymer?#

The host plastic decides the polymeric flame retardant: brominated polystyrene or PBB-PA with antimony trioxide for glass-filled PA66 and PBT connectors, PolyFR for EPS and XPS insulation boards, and brominated epoxy oligomers for PBT, PET and styrenic housings. Table 4 maps 7 polymer groups to a type, synergist, parts and halogen-free competitor.

No loading for any polymeric flame retardant is recorded in our sources; the halogen-free column shows published supplier loadings for comparison only.

Glass-filled polyamide (PA66) and high-temperature polyamides#

Glass-filled PA66 is the main market for brominated polystyrene and PBB-PA, because both stay stable at polyamide processing temperatures and, with antimony trioxide, are specified against the glow-wire and tracking targets of connectors in unattended appliances: GWFI of at least 850 °C (1562 °F) and GWIT of at least 775 °C (1427 °F) under IEC 60335-1. Clause 30.2.3 of IEC 60335-1 sets those 2 values for parts carrying connections of more than 0.2 A.

Why is glass-filled nylon hard to flame-retard? The research literature names a "wick effect" of the glass fibres, and lists 4 routes for glass-filled PA6 and PA66: aluminium diethylphosphinate with MPP (and zinc borate), red phosphorus, brominated polystyrene with antimony trioxide, and polymeric brominated flame retardants with zinc sulfide. Unfilled and glass-filled grades, halogen-free ones included, are compared under flame retardants for nylon.

No glow-wire, CTI or UL 94 result for a brominated polystyrene or PBB-PA compound is recorded in our sources, so the benchmark is halogen-free: Clariant's Exolit OP 1312 at 15-20 wt% reaches UL 94 V-0 from 0.4 to 3.2 mm, a GWIT of 775 °C, a GWFI of 960 °C and a CTI of 600 V in PA6 and PA66. In PA 6T/66, brominated polystyrene competes with about 15 wt% of Exolit OP 1230. Glass content and its effect on burning are covered under glass-filled nylon.

PBT and PET compounds#

PBT and PET compounds use brominated epoxy oligomers or brominated polystyrene, often with sodium antimonate instead of antimony trioxide, because the antimony(V) salt is less likely to catalyse depolymerisation of the polyester during processing. Sodium antimonate, CAS 15432-85-6, is less acidic and less catalytically active towards polyester depolymerisation than antimony trioxide, which matters in a polymer such as PBT that is sensitive to hydrolysis above 60 °C (140 °F). Brominated epoxy oligomers, brominated polystyrene and the reported TBBPA carbonate oligomers are the 3 polymeric options named for polyesters in our sources.

The halogen-free benchmark in glass-filled PBT is 18 wt% aluminium diethylphosphinate (Exolit OP 1260) for UL 94 V-0. Halogen-free and brominated systems for polyesters are compared under flame retardants for PBT and PET.

EPS and XPS insulation foam#

EPS and XPS insulation boards are made flame retardant with PolyFR, the polymeric replacement for HBCD, which is added during bead or board production because unmodified expanded polystyrene has a limiting oxygen index of only about 18 % while ASTM C578 requires more than 24 %. The US insulation standard ASTM C578 measures the oxygen index by ASTM D2863, and EPS boards are 95-98 % air at 11-32 kg/m3 (about 0.7-2.0 lb/ft3). In Europe the targets are EN 13501-1 class E and, in Germany, DIN 4102 class B1.

HBCD was the foam flame retardant until it became an SVHC (28 October 2008), a Stockholm Annex A POP (2013) and reached its REACH Annex XIV sunset date (21 August 2015); the Stockholm exemption for EPS and XPS in buildings has since expired, and the POPs Regulation (EU) 2019/1021 caps HBCD at 100 mg/kg as an unintentional trace contaminant. Foam-grade systems, expandable graphite included, are on flame retardants for polystyrene, EPS and XPS.

Polymeric flame retardants in foam get their own stabiliser packages, such as Songwon's SONGXTEND 1301 for EPS and XPS. The halogen-free route is expandable graphite (CAS 12777-87-6), which starts to expand at about 200 °C (392 °F). The rest of the foam formulation is on additives for polystyrene.

HIPS, ABS and PC/ABS housings#

In HIPS, ABS and PC/ABS housings, brominated epoxy oligomers are the polymeric alternative to small-molecule DBDPE, which reaches UL 94 V-0 at 0.8 mm in HIPS with 10.7 wt% bromine plus 5 wt% antimony trioxide. The brominated routes for ABS and HIPS in our sources are 4: DBDPE, FR-245, brominated epoxy oligomers and additive TBBPA, each with antimony trioxide, and LANXESS sells the PolyFR-type Emerald Innovation 5000 for styrenics.

Why does DBDPE's SVHC listing matter to housing compounders? DBDPE became an SVHC on 5 November 2025 and is one of the 3 mandated substances in the planned EU restriction, while polymeric grades sit outside its scope. Display housings are the exception: Ecodesign Regulation (EU) 2019/2021 bans all halogenated flame retardants in electronic display enclosures and stands from 1 March 2021, polymeric grades included, and halogen-free V-0 there runs mainly through PC/ABS or PPE/HIPS with aryl phosphates such as BDP and RDP. Brominated and halogen-free ABS systems are compared under flame retardants for ABS.

How Much Polymeric Flame Retardant Does a Plastic Need?#

Our sources publish no loading level for any polymeric flame retardant: the level is set by the grade's bromine content (65 to 71 wt% against at least 82 wt% for DBDPE), the antimony synergist, and the rating and wall thickness the part must pass. The nearest published benchmark is a small-molecule one: HIPS reaches UL 94 V-0 at 0.8 mm with 10.7 wt% bromine plus 5 wt% antimony trioxide, about 8-12 wt% DBDPE. The benchmark comes from Albemarle's data for DBDPE (decabromodiphenyl ethane).

A polymeric grade with 65 to 71 wt% bromine has to be added at a higher mass than DBDPE to carry the same bromine, and trials against the part's rating and thickness set the actual level; across all chemistries, flame retardants make up 2-28 wt% of a plastic product (Chea et al., 2025, adapted from Hahladakis et al., 2018). The 3 drivers of the loading are listed below.

• Bromine content of the grade: 65 wt% for PolyFR, 71 wt% for PBB-PA, not published for the other 2 brominated types
• Synergist type and ratio: antimony trioxide, sodium antimonate in polyesters, or zinc stannate as a partial replacement
• Target rating and wall thickness: the UL 94 class, glow-wire temperature and part thickness to pass

Antimony trioxide and other synergists for polymeric brominated flame retardants#

Every polymeric brominated flame retardant needs a synergist, normally antimony trioxide, because antimony trioxide turns the released hydrogen bromide into volatile antimony bromides that trap far more flame radicals than the bromine alone. Antimony trioxide (CAS 1309-64-4) carries a harmonised Carc. 2 (H351) classification, an EU 10/2011 specific migration limit of 0.04 mg/kg as antimony (FCM No 398), a Proposition 65 cancer listing since 1 October 1990 and IARC Group 2A (Volume 131, 2022), and it is not an SVHC. Its Carc. 2 classification and food-contact limit are on antimony trioxide. Table 5 compares the 3 synergists used with polymeric brominated grades.

Antimony supply is the commercial reason to look at tin-based partial replacements: the USGS Mineral Commodity Summaries 2026 put the average antimony price at USD 25 per pound (about USD 55 per kg) in 2025, up from USD 10.24 per pound in 2024, after China introduced export licences in August 2024 and banned exports to the United States in December 2024. Zinc stannate (Flamtard S, William Blythe) acts as a halogen synergist and char promoter, and the EU ENFIRO project (concluded 2012) found it to have a good environmental profile. The tin-based partial replacement is profiled on zinc stannate.

How Are Polymeric Flame-Retardant Compounds Tested?#

Polymeric flame-retardant compounds are tested with the same tools as any flame-retardant plastic: UL 94 for housings and connectors, the glow-wire and comparative tracking index tests for electrical parts, and the limiting oxygen index and EN 13501-1 for insulation foam. UL 94 V-0 requires a single afterflame of no more than 10 s, no more than 50 s in total for 10 flame applications, an afterglow of no more than 30 s and no flaming drips that ignite the cotton; V-1 and V-2 allow 30 s and 250 s, and HB allows up to 76 mm/min (about 3 in/min) below 3 mm. V-0, V-1, V-2 and 5VA criteria are on UL 94 flammability ratings. Table 6 lists the 6 tests.

The oxygen index is read against the 20.9 % oxygen content of air, which is why unmodified EPS at about 18 % burns. Comparative tracking index matters more for connector grades: ICL markets PBB-PA for a high CTI, a supplier claim, and no test result for any polymeric flame-retardant compound is recorded in our sources. Why bromine and tracking interact is explained under comparative tracking index (CTI).

What Is the Regulatory Status of Polymeric Flame Retardants?#

Polymeric brominated flame retardants are not restricted in the EU and none is on the REACH Candidate List, because the restriction now being prepared covers only non-polymeric aromatic brominated flame retardants, but the Ecodesign ban on halogenated flame retardants in display housings applies to them like any other. That status holds as of October 2026 for the 4 brominated types; polyphosphonates have no regulatory record in our sources.

Why polymeric brominated flame retardants fall outside the EU ABFR restriction#

Polymeric brominated flame retardants fall outside the EU restriction because ECHA's 18 December 2024 report recommended restricting non-polymeric additive aromatic brominated flame retardants as a group, and the restriction work mandated by the Commission on 11 November 2025 keeps that scope. ECHA's report counted about 60 aromatic brominated flame retardants (ABFRs) potentially on the EU market, 25 registered and more than 40 PBT or vPvB or likely to be. The scope now names DBDPE, TBPH and BTBPE as the mandated SVHCs plus 19 further ABFRs under interim PBT/vPvB assessment, with a broader option covering 24 non-polymeric ABFRs, in electrical and electronic equipment, construction products and textiles. Table 7 dates the 6 steps so far.

Polymeric grades were not the target because of their size: ECHA framed the group restriction around non-polymeric additive ABFRs, which is a statement of scope, not a finding that polymeric grades are safe. The dossier is planned, not adopted, so "out of scope" describes the restriction as currently framed. Each step, consultation and date is tracked under EU restriction of aromatic brominated flame retardants.

Which rules still apply to polymeric brominated flame retardants?#

4 rules still reach polymeric brominated flame retardants: the EU Ecodesign ban on halogenated flame retardants in display enclosures since 1 March 2021, the New York and Washington organohalogen rules for electronics enclosures, RoHS testing for PBB and PBDE, and the POPs limits that apply to recycled feedstock. The 4 rules are listed below.

• EU Ecodesign display ban: Regulation (EU) 2019/2021 bans all halogenated flame retardants in electronic display enclosures and stands from 1 March 2021, upheld by the EU General Court; "all" includes polymeric grades.
• New York and Washington organohalogen rules: New York's Environmental Conservation Law bans organohalogen flame retardants in display enclosures and stands from 1 January 2024, and Washington's Safer Products rule (chapter 173-337 WAC, Cycle 1) restricts them in electronics enclosures from 1 January 2025; both cover organohalogen flame retardants as a class, so check the statutory definition for polymeric grades.
• RoHS screening: Directive 2011/65/EU restricts only PBB and PBDE, at 0.1 % per homogeneous material, and the planned addition of TBBPA and MCCP was dropped in 2024, so RoHS does not restrict polymeric grades, but PBB and PBDE screening still applies to the part. Why polymeric BFRs pass RoHS while PBDEs do not is covered under RoHS and plastic additives.
• EU POPs limits for recycled feedstock: Regulation (EU) 2019/1021 caps HBCD at 100 mg/kg and the PBDE sum at 10 mg/kg, which matters for recycled plastics, not for new polymeric grades.

US state laws and furniture rules are collected under flame retardant regulations.

REACH registration and the polymer exemption#

Polymeric flame retardants are exempt from REACH registration as polymers under Article 2(9) of Regulation (EC) No 1907/2006, while the monomers they are made from must be registered, which is why poly(pentabromobenzyl acrylate) is identified by an ECHA list number and its monomer by the EC number 261-767-7. The ECHA list numbers 618-171-0 (brominated polystyrene), 639-977-9 (PBB-PA) and 614-817-0 (brominated epoxy oligomer) are identifiers that ECHA assigns, not registration numbers.

Whether each commercial grade, oligomers in particular, meets the REACH polymer definition is decided grade by grade, so this page states the rule, not a per-grade status. The European Commission set aside the full REACH revision, including a registration requirement for polymers, on 27 April 2026. Registration duties for additives and their monomers are explained under REACH and plastic additives.

Are polymeric flame retardants SVHCs?#

No: none of the 4 polymeric brominated flame retardants is on the REACH Candidate List of 253 entries (last updated 4 February 2026), while 6 small-molecule brominated flame retardants are, from HBCD in 2008 to DBDPE in 2025. The 6 are HBCD (2008), decaBDE (2012), TBBPA, TBPH and BTBPE (17 January 2023) and DBDPE (5 November 2025); all flame-retardant entries are on the SVHC Candidate List.

Who Makes Polymeric Flame Retardants?#

Polymeric brominated flame retardants come from the 3 large bromine producers: Albemarle (Saytex HP-3010 and HP-7010 brominated polystyrene, GreenCrest), LANXESS (Emerald Innovation 3000 and 5000) and ICL (FR-1025 and FR-122P). Bromine explains the concentration: world bromine production outside the United States was about 400,000 t in 2024 (estimate), 140,000 t of it in Israel, and brominated flame retardants are its main use (USGS Mineral Commodity Summaries 2026). Table 8 lists the 3 producers and their brands.

LANXESS, which acquired Chemtura on 21 April 2017, also owns the Firemaster brand. Buyers should compare grades by CAS number, bromine content and molecular weight on the datasheet, not by brand, because 3 brand names cover the same PolyFR CAS number. No polyphosphonate producer is recorded in our sources. Plants and certifications by company are in the directory of flame retardant manufacturers and suppliers.

─── The sections below cover health, substitution history and recycling, outside the core selection and regulatory guidance above. ───

Are Polymeric Flame Retardants Safer Than Small-Molecule Flame Retardants?#

Polymeric flame retardants are designed to be less mobile than small brominated molecules, because a molecular weight of 100,000 or more keeps them from blooming and limits uptake, but no listing or study in our sources yet shows that they are safer over their whole life cycle. Producers describe the high molecular weight as limiting bioavailability, and absence from the Candidate List is a regulatory status, not a safety verdict.

Studies of how polymeric brominated flame retardants degrade are not yet in our source library, so this page states no finding on them. Exposure evidence for the whole class is reviewed under flame retardants and human health.

From HBCD and decaBDE to polymeric grades: the substitution timeline#

Polymeric grades replaced small brominated molecules in two waves: PolyFR took over EPS and XPS after HBCD reached the Stockholm Convention in 2013, and polymeric options became the alternative in housings and connectors after DBDPE, the decaBDE substitute, became an SVHC on 5 November 2025. Polymeric grades took over in 5 dated steps.

1. 28 October 2008: HBCD added to the REACH Candidate List as a PBT substance.
2. 19 December 2012: decaBDE added to the Candidate List.
3. 2013 to 21 August 2015: HBCD listed in Stockholm Annex A (COP-6), banned in Japan in May 2014 and past its Annex XIV sunset date; PolyFR takes over EPS and XPS.
4. 2017: decaBDE listed in Stockholm Annex A (COP-8); DBDPE takes over housings, with brominated polystyrene and PolyFR among the later substitutes.
5. 5 and 11 November 2025: DBDPE added to the Candidate List and the ABFR restriction mandated, leaving polymeric grades out.

The Stockholm listings and EU limits are on POPs in plastics.

Polymeric flame retardants in recycled plastics#

Recyclers screen for the legacy small molecules, not the polymeric grades: recycled EPS must stay below 100 mg/kg HBCD and recovered material below 350 mg/kg of PBDEs from 30 December 2025, while ICL markets its PBB-PA as suited to recycling. Delegated Regulation (EU) 2025/1482 sets the PBDE sum at 10 mg/kg in mixtures and articles, with 350 mg/kg for articles made from recovered material from 30 December 2025 and 200 mg/kg from 30 December 2027. ICL's recyclability claim is a supplier statement, not a recorded study. Sorting and legacy-additive limits are on how additives affect plastic recyclability.

Is PolyFR the same as HBCD?#

No: HBCD is a small cycloaliphatic molecule of 641.7 g/mol and a Stockholm POP since 2013, while PolyFR is a brominated butadiene-styrene copolymer of about 100,000 that replaced it in EPS and XPS and is not on the Candidate List. Both carry bromine, 74.7 wt% in HBCD and about 65 wt% in PolyFR, and both act in the gas phase.

What are flame-retardant polymers?#

Flame-retardant polymers are plastics that resist ignition, either by their own structure, like PEEK and PPS, or because a flame retardant has been compounded in, like PA66 with a phosphinate; a polymeric flame retardant is one of the additives that can do the compounding. UL 94 ratings by polymer are listed under flame-retardant plastics.

Are polymeric flame retardants and polymeric plasticizers related?#

Only by name: polymeric plasticizers are polyesters of dibasic acids and glycols that soften PVC and resist extraction, while polymeric flame retardants are brominated or phosphorus polymers that slow burning; both use high molecular weight to stay in the plastic. The PVC additive with the same prefix is described under polymeric plasticizers.

---