Brominated flame retardants
Brominated flame retardants (BFRs) are mixtures of man-made chemicals that are added to a wide variety of products, including for industrial use, to make them less flammable. They are used commonly in plastics, textiles and electrical/electronic equipment.
There are five main classes of BFRs, listed here with their common uses:
- Polybrominated diphenyl ethers (PBDEs) – plastics, textiles, electronic castings, circuitry.
- Hexabromocyclododecanes (HBCDDs) – thermal insulation in the building industry.
- Tetrabromobisphenol A (TBBPA) and other phenols – printed circuit boards, thermoplastics (mainly in TVs).
- Polybrominated biphenyls (PBBs) – consumer appliances, textiles, plastic foams.
- Other brominated flame retardants.
These classes have been marketed as technical mixtures under different commercial brands.
In the European Union the use of certain BFRs is banned or restricted; however, due to their persistence in the environment there are still concerns about the risks these chemicals pose to public health. BFR-treated products, whether in use or waste, leach BFRs into the environment and contaminate the air, soil and water. These contaminants may then enter the food chain where they mainly occur in food of animal origin, such as fish, meat, milk and derived products.
Between October 2010 and October 2012, EFSA’s Panel on Contaminants in the Food Chain (CONTAM Panel) completed a series of six scientific opinions on the main groups of BFRs and potential risks to public health from their presence in food.
October 2012 The scientific opinion on emerging and novel BFRs looks at lesser-known BFRs not covered in the five other scientific opinions. Whereas emerging BFRs have been identified in materials and/or goods and in wildlife, food or humans, novel BFRs have been identified only in materials and/or goods but not in wildlife, food or humans. Limited and widely varying data on 17 emerging and 10 novel BFRs were collected. Due to the lack of data and limited information on occurrence, exposure and toxicity for all these BFRs, a risk characterisation was not possible. Using available information and a modelling exercise, experts identified some emerging and novel BFRs that could be a potential health concern and should be considered first for future investigations. There is convincing evidence (including more extensive toxicity data) that the emerging BFR tris(2,3-dibromopropyl) phosphate (TDBPP) and the novel BFR 2,2-Bis(bromomethyl)-1,3-propanediol (DBNPG) are genotoxic and carcinogenic, warranting further surveillance of their occurrence in the environment and in food. Based on the limited experimental data on environmental behaviour, 1,2-bis(2,4,6-tribromophenoxy)ethane (BTBPE) and hexabromobenzene (HBB) were identified as compounds that could raise a concern as reports indicate that they can accumulate in the body over time.
April 2012 EFSA publishes an opinion on Brominated phenols and their derivatives (other than TBBPA or its derivatives). Due to the lack of occurrence data and toxicity studies, the risk assessment focuses on 2,4,6-tribromophenol (2,4,6-TBP). It is unlikely that current dietary exposure to 2,4,6-TBP in the EU would raise a health concern. Also, exposure of infants to 2,4,6-TBP via breast feeding is unlikely to raise a health concern. Due to lack of data a risk assessment of the other brominated phenols or their derivatives was not possible.
December 2011 Current dietary exposure to Tetrabromobisphenol A (TBBPA) in the EU does not raise a health concern. No occurrence data for TBBPA derivatives were submitted to EFSA and no information on their toxicity was identified. Therefore a risk assessment on TBBPA derivatives was not possible.
July 2011 EFSA concludes that current dietary exposure to Hexabromocyclododecanes (HBCDDs) in the EU does not raise a health concern. Furthermore, additional exposure, particularly of young children, to HBCDDs from house dust is unlikely to raise a health concern.
May 2011 EFSA considers eight polybrominated diphenyl ethers (PBDEs) of primary interest. Relevant toxicity data are available for four of them (BDE-47, -99, -153 and -209). The risk assessment is limited to these four, for which the margin of exposure (MOE)A tool used in risk assessment to explore safety concerns arising from the presence of a potentially toxic substance in food or animal feed. approach is used. For BDE-99, the MOE indicates a potential health concern with respect to the current dietary exposure. This was notable for young children (aged 1-3 years old), although the presence of one food sample in the category ‘Food for infants and small children’ with a high concentration of BDE-99 could have led to overestimation of the exposure for this specific age group. For BDE-47, -153 and -209 the current dietary exposure is unlikely to raise a health concern. As numerous products containing PBDEs are still in use, the surveillance of PBDEs should continue.
October 2010 EFSA experts conclude that the risk to the European population from exposure to Polybrominated biphenyls (PBBs) through food is of no concern. PBBs are no longer produced or used in Europe and environmental concentrations are low and declining, therefore PBBs should be a low priority for further research or monitoring efforts.
February 2006 EFSA identifies some compounds to be monitored in food and feed, based on knowledge on the production volumes, the occurrence of each chemical compound in food and feed, their persistence in the environment and their toxicity. This follows a request from the European Commission to determine the chemical compounds within the groups of BFRs that may be a concern for human and/or animal health to monitor their possible presence in food and feed.
Subsequently, EU-wide collection of occurrence data on these compounds in food began in October 2006. These monitoring results are made available to EFSA for its risk assessment work through cooperation with the Member States and calls for data.
EFSA provides scientific advice and risk assessments on BFRs for EU risk managers to help them assess the need for regulatory measures as regards the safety of BFR-contaminated food. EFSA is required to:
- Evaluate the toxicity of BFRs for humans considering all relevant toxicological information available.
- Carry out exposure assessments on the basis of occurrence data obtained in food monitoring activities, in particular, from EU Member States.
- Consider the exposure of specific population groups (e.g. infants and children, people following specific diets, etc.) to BFRs through food and indicate the relative importance of other non-dietary sources.
- Explore whether individual compounds can be used as markers for dietary exposure to BFRs.
- Identify potential data gaps for the five groups of BFRs.
The EU has adopted legislation to reduce or halt the sale and use of certain BFRs to protect health and the environment.
Directive 2003/11/EC, which amends Directive 76/769/EEC on the marketing and use of certain dangerous substances and preparations, bans the sale of two commercial mixtures of PBDEs, known as PentaBDE and OctaBDE, in concentrations higher than 0.1% by mass.
From July 2006, under Directive 2002/95/EC, all new electrical and electronic equipment can no longer contain PBBs and PBDEs in any concentration. In July 2008, a third PBDE mixture, DecaBDE, originally exempted from the restrictions, was also banned by the European Court of Justice (ECJ).
In June 2009, to assess the need for regulatory measures as regards BFRs in food, the Commission asked EFSA for five scientific opinions on the risks to human health related to the presence of BFRs in food.