Retardant Safety Testing Service – Comprehensive Evaluation of Health, Environmental and Thermal Stability Risks for Flame Retardants and Fire‑Resistant Materials
As an ISO/IEC 17025 accredited independent testing laboratory, we offer specialised safety testing services for flame retardants and fire‑resistant materials to manufacturers, regulatory compliance teams, and product developers across the plastics, textiles, electronics, automotive, construction, and aerospace sectors. Flame retardants – including brominated, chlorinated, phosphorus‑based, nitrogen‑based, inorganic, and intumescent systems – are essential for meeting fire safety standards. However, their safety profile must be rigorously evaluated to address concerns related to toxicity, persistence, bioaccumulation, environmental release, and thermal decomposition by‑products. Our testing platform assesses the full spectrum of safety parameters – from chemical composition and impurity screening to thermal stability, decomposition products, leachability, and ecotoxicological impact – ensuring that your flame retardant formulations meet the most stringent global regulatory requirements and industry‑specific safety standards. All methods are aligned with REACH (EC 1907/2006), RoHS (2011/65/EU), POPs (EU 2019/1021), IEC 61249‑2‑21, ISO 10993, ASTM D2843, EN 71‑3, GB/T 26125, and GB/T 26572. Our reports are recognised by the National Medical Products Administration (NMPA), the State Administration for Market Regulation (SAMR), the Ministry of Ecology and Environment (MEE), the European Chemicals Agency (ECHA), and the U.S. Environmental Protection Agency (EPA) for product registration, compliance certification, and supply chain due diligence.
Flame Retardant Types and Products We Regularly Test
Our laboratory handles a wide range of flame retardant chemistries, formulations, and product applications. Typical test articles include:
- Halogenated flame retardants – brominated compounds (e.g., deca‑BDE, hexabromocyclododecane – HBCD, tetrabromobisphenol A – TBBPA), chlorinated compounds (e.g., Dechlorane Plus, chlorinated paraffins), and mixed halogen‑based systems
- Phosphorus‑based flame retardants – organophosphates (e.g., triphenyl phosphate – TPP, resorcinol bis‑diphenyl phosphate – RDP), phosphinates, and red phosphorus
- Nitrogen‑based flame retardants – melamine, melamine cyanurate, melamine polyphosphate, and guanidine salts
- Inorganic flame retardants – aluminium hydroxide (ATH), magnesium hydroxide (MDH), antimony trioxide (Sb₂O₃), zinc borate, and ammonium polyphosphate
- Intumescent flame retardants – acid sources (e.g., ammonium polyphosphate), carbon sources (e.g., pentaerythritol), and blowing agents (e.g., melamine)
- Flame retardant masterbatches and concentrates – for polymer compounding
- Flame‑retardant finished products – plastics, textiles, foams, coatings, adhesives, and sealants
- Recycled and recovered flame retardant materials – for verifying the safety of recycled content
Chemical Composition and Impurity Screening – Identifying Restricted and Hazardous Substances
- Restricted substances analysis – RoHS, REACH and POPs – IEC 62321 / GB/T 26125 – We screen for the presence of restricted substances, including polybrominated biphenyls (PBBs), polybrominated diphenyl ethers (PBDEs), hexabromocyclododecane (HBCD), short‑chain chlorinated paraffins (SCCPs), and other persistent organic pollutants (POPs). The analysis is performed using GC‑MS, LC‑MS/MS, and XRF. For each restricted substance, we report the concentration (in ppm) and provide a clear pass/fail verdict against the regulatory limit.
- Heavy metal screening – EN 71‑3 / ISO 8124‑3 / GB/T 26125 – We quantify the concentration of heavy metals in the flame retardant formulation, including lead (Pb), cadmium (Cd), mercury (Hg), hexavalent chromium (Cr⁶⁺), antimony (Sb), arsenic (As), barium (Ba), and selenium (Se). The analysis is performed using ICP‑MS and UV‑Vis spectrophotometry. For consumer products, the heavy metal content must be below the limits specified in EN 71‑3 (for toys) and RoHS (for electronics).
- Phthalate and plasticiser screening – REACH / GB/T 22048 – We screen for the presence of phthalates (e.g., DEHP, DBP, BBP, DINP, DIDP, DNOP) that may be used as plasticisers in flame retardant formulations. The analysis is performed using GC‑MS, and the results are compared to the REACH limits.
- Bromine and chlorine content determination – IEC 61249‑2‑21 / GB/T 26125 – We determine the total bromine and chlorine content (in ppm) using combustion ion chromatography (CIC) or XRF. The total halogen content is used to classify the material as halogen‑free (≤ 900 ppm for Br, ≤ 1 500 ppm for Cl, and ≤ 1 500 ppm for total halogens).
- Identification of unknown substances and impurities – using GC‑MS, LC‑MS/MS and FTIR – For custom formulations and for investigating contamination, we perform non‑targeted screening to identify unknown substances and impurities. The results are reported as a qualitative and semi‑quantitative analysis.
Thermal Stability and Decomposition Products – Assessing the Release of Toxic Fumes
- Thermogravimetric analysis (TGA) – ISO 11358 / ASTM E1131 / GB/T 27761 – We measure the thermal stability of the flame retardant by heating the sample at a controlled rate (typically 10 °C/min) and monitoring the mass loss as a function of temperature. The decomposition temperature (Td5, Td10, Td50) and the residue at 600 °C are reported. A low decomposition temperature (< 200 °C) indicates that the flame retardant may release toxic fumes during processing or low‑temperature fires.
- Differential scanning calorimetry (DSC) – ISO 11357 / ASTM E1356 / GB/T 19466 – We use DSC to measure the melting temperature, the glass transition temperature (Tg), and the curing temperature (for reactive systems). The thermal transitions are correlated with the thermal stability and the processing conditions.
- Decomposition products analysis – using GC‑MS, FTIR, and ion chromatography – ISO 19702 / ASTM E800 / GB/T 16157 – We analyse the decomposition products (volatile and semi‑volatile compounds) released during thermal decomposition of the flame retardant at 300‑800 °C. The major decomposition products (including HBr, HCl, POx, CO, HCN, and organic fragments) are identified and quantified. The toxicity of the decomposition products is assessed using the fire toxicity index (FTI) and the lethal concentration (LC₅₀).
- Smoke density and corrosivity – ASTM D2843 / ISO 5659‑2 / GB/T 17657 – We measure the smoke density (the optical density of the smoke) and the corrosivity (the pH and electrical conductivity of the smoke condensate) during thermal decomposition. The test is performed in a smoke density chamber or a cone calorimeter. A smoke density of > 300 (at 4 minutes) is considered a high smoke hazard.
- Hydrogen halide release – for halogenated flame retardants – EN 50267‑2‑2 / IEC 60754‑1 / GB/T 17650 – We measure the release of hydrogen halides (HBr, HCl, HF) during thermal decomposition at 600 °C. The hydrogen halide concentration (in ppm or mg/g) is reported. A high hydrogen halide release (> 10 mg/g) indicates a potential risk of corrosion and acid gas inhalation.
Leaching and Extractability Testing – Assessing the Release into the Environment
- Leaching test – EN 12457 / ISO 21268 / GB/T 15555 – for determining the release of flame retardant components into the environment – We perform a leaching test by immersing the flame retardant (or the flame‑retardant‑treated material) in water (or a specified leachant) at a specified pH, temperature, and liquid‑to‑solid ratio. The leachate is analysed for the concentration of the flame retardant components (or their degradation products) using LC‑MS/MS, GC‑MS, and ICP‑MS. The leachability is expressed as the percentage of the total content that is released.
- Extractability test – ISO 10993‑12 / USP <661> – for assessing the extractables from flame‑retardant materials in medical device and food contact applications – We perform extraction using a range of solvents (water, ethanol, hexane, and simulated body fluids) to simulate the release of flame retardant components during use. The extract is analysed for the concentration of the flame retardant components, and the cumulative extractable amount (in mg/device or µg/cm²) is reported.
- Mobility and migration testing – ASTM D4754 / EN 13130 / GB/T 5009 – for assessing the transfer of flame retardants from packaging to food – For flame retardants used in food contact materials (e.g., packaging), we perform migration testing using food simulants (e.g., 3 % acetic acid, 10 % ethanol, olive oil). The concentration of the flame retardant components in the simulant is measured, and the migration rate (in mg/kg or mg/dm²) is calculated and compared to the specific migration limit (SML).
- Sediment and soil leaching test – OECD 106 / ISO 11266 – for assessing the environmental fate – For flame retardants that may be released into the environment, we perform a sediment or soil leaching test to assess the adsorption/desorption behaviour. The partition coefficient (Koc) is calculated, and the mobility is classified as high, medium, or low.
Ecotoxicological and Human Health Risk Assessment – Evaluating the Toxicological Profile
- Acute toxicity test – OECD 201 / OECD 202 / OECD 203 – for assessing the aquatic toxicity – We perform acute toxicity tests on algae (e.g., Pseudokirchneriella subcapitata), daphnia (e.g., Daphnia magna), and fish (e.g., Danio rerio) to determine the 48‑h EC₅₀ and 96‑h LC₅₀. The test is performed on the flame retardant formulation (or the leachate) at a range of concentrations. The results are used to classify the material for aquatic toxicity (e.g., Category 1, 2, or 3).
- Chronic toxicity and bioaccumulation potential – OECD 211 / OECD 305 / REACH Annex XIII – For substances that are persistent, bioaccumulative, and toxic (PBT) or very persistent and very bioaccumulative (vPvB), we perform chronic toxicity tests (on daphnia and fish) and bioaccumulation tests (on fish). The bioconcentration factor (BCF) and the bioaccumulation factor (BAF) are determined. A BCF of > 2 000 is considered to indicate a high bioaccumulation potential.
- Developmental toxicity and reproductive toxicity screening – OECD 414 / OECD 421 – for assessing the human health risk – For flame retardants that are used in consumer products, we perform developmental toxicity and reproductive toxicity screening tests (in vitro or in vivo). The test assesses the potential for teratogenicity and reproductive harm.
- Endocrine disruption screening – OECD 455 / OECD 456 – for assessing the hormonal activity – We screen the flame retardant for endocrine‑disrupting activity using in vitro assays (e.g., the estrogen receptor (ER) and androgen receptor (AR) transactivation assays). The results are reported as the relative potency (compared to the reference compound) and the EC₅₀.
- Mutagenicity and genotoxicity testing – OECD 471 / OECD 487 / ISO 10993‑3 – We perform the Ames test (OECD 471) and the in vitro micronucleus test (OECD 487) to assess the mutagenicity and genotoxicity of the flame retardant. The results are reported as positive, negative, or equivocal.
Regulatory Compliance and Product Certification – Supporting Global Market Access
Our flame retardant safety testing services are aligned with the most widely used international and national regulations. The most commonly requested include:
- REACH (EC 1907/2006) – Registration, Evaluation, Authorisation and Restriction of Chemicals – we perform the required testing for REACH registration, including the physicochemical properties, the toxicological and ecotoxicological data, and the exposure assessment.
- RoHS (2011/65/EU) – Restriction of Hazardous Substances in Electrical and Electronic Equipment – we screen for the RoHS‑restricted substances (Pb, Cd, Hg, Cr⁶⁺, PBBs, PBDEs, and the phthalates DEHP, BBP, DBP, and DIBP).
- POPs (EU 2019/1021) – Persistent Organic Pollutants Regulation – we screen for the POPs‑listed substances, including PBDEs, HBCD, and SCCPs.
- GB/T 26572 – Requirements of concentration limits for certain hazardous substances in electrical and electronic products – the Chinese standard for RoHS compliance.
- IEC 61249‑2‑21 – Halogen‑free materials for printed wiring boards – for determining the halogen‑free status.
- ISO 10993 – Biological evaluation of medical devices – for flame retardants used in medical device applications.
- EN 71‑3 – Safety of toys – Migration of certain elements – for flame retardants used in toy applications.
- GB/T 26125 – Determination of certain substances in electrical and electronic products – for screening of restricted substances.
Report Acceptance and Regulatory Recognition
All retardant safety tests are conducted under our ISO/IEC 17025 accreditation and in compliance with Good Laboratory Practice (GLP) principles, where applicable. Our final test reports include: a complete description of the flame retardant (product name, chemical composition, formulation), the test methods used, the measured parameters (concentration of restricted substances, thermal stability, decomposition products, leachability, ecotoxicity, cytotoxicity), a statistical summary (mean, standard deviation), and a clear pass/fail verdict against your specified acceptance criteria (e.g., RoHS compliance, REACH registration, halogen‑free status). These reports are accepted by the National Medical Products Administration (NMPA), the State Administration for Market Regulation (SAMR), the Ministry of Ecology and Environment (MEE), the European Chemicals Agency (ECHA), the U.S. Environmental Protection Agency (EPA), and other global regulatory authorities for product registration, compliance certification, and supply chain due diligence. Bilingual (English/Chinese) versions are available to facilitate submissions to domestic and international regulatory bodies and to support your global market access.
