Tetrabromobisphenol A

• 2,2 ', 6,6' -tetrabromo -4, 4' -isopropylidenediphenol
• 2,2 ', 6,6'- tetrabromobisphenol A
• 3,3 ', 5,5'- tetrabromobisphenol A
• 2,2- bis (3,5- dibromo-4 -hydroxyphenyl) propane
• 4,4 '- isopropylidenebis (2,6- dibromophenol )
• TBBPA
• TBBP -A
• TBBA

Colorless crystalline substance

Fixed

2.12 g · cm -3 ( 20 ° C)

178 ° C

From 250 ° C decomposition

Insoluble in water (0.24 mg · l-1 at 25 ° C)

Attention

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Tetrabromobisphenol A (TBBPA ) is a flame retardant, that is, a substance which is present in some plastic materials. This is achieved in particular that a local fire can slowly develop into an apartment or building fire. Persons present in the building get more time to get to safety.

Production and representation

TBBPA is a derivative of bisphenol A and is made ​​of this.

Use

TBBPA can be used as reactive and as an additive flame retardant. In reactive applications it is chemically bound into polymers, such as epoxy and polycarbonate resins. The main application of this technique is the manufacture of printed circuit boards which are incorporated into various electronic devices. As an additive flame retardant ( admixture without chemical reaction) TBBPA is used in plastics such as ABS. These are, inter alia on televisions used. The annual consumption in 2001 was estimated at 119,600 tons worldwide, of which about 11,600 tons were used by European industry. In electrical an average concentration of 1.42 g / kg was found in a 2003 study, what the widespread use of TBBPA in electrical equipment confirmed. Since only additive, added, not reactively bound TBBPA could be measured, the effective use of this flame retardant is likely to be considerably higher.

Environmental relevance

TBBPA can pass through various processes in the environment and is present in trace concentrations in the environmental air, water, soil and river sediments. In the sewage sludge and in the house dust, it is found. However, the concentrations are lower than those of other flame retardants. In a survey conducted by WWF study TBBPA was also found in the blood of European parliamentarians. A detailed risk assessment under the EU Existing Substances Regulation 793/93/EEC has reviewed these findings, among others, and found no risk to the health of tetrabromobisphenol A.

TBBPA has been subjected to an eight-year EU risk assessment, in the course of more than 460 studies were evaluated. The results of the risk assessment were published in June 2008 in the EU Official Journal. TBBPA is now going through the REACH registration process.