| Tetrabromobisphenol A | |
|---|---|
|
2,2',6,6'-Tetrabromo-4,4'-isopropylidenediphenol |
|
|
Other names
2,2',6,6'-Tetrabromobisphenol A, 2,2-Bis(3,5-dibromo-4-hydroxyphenyl)propane, 4,4'-Isopropylidenebis(2,6-dibromophenol) |
|
| Identifiers | |
| Abbreviations | TBBPA, TBBP-A, TBBA |
| CAS number | 79-94-7 |
| Properties | |
| Molar mass | 543.9 g·mol−1 |
| Density | 2,12 g·cm−3 (20 °C)[1] |
| Melting point |
178 °C[1] |
| Boiling point |
250 °C (decomposition)[1] |
| Hazards | |
| R-phrases | R50/53[1] |
| S-phrases | S60 S61[1] |
| Main hazards | N[1] |
| (verify) (what is: /?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
|
| Infobox references | |
Tetrabromobisphenol A (TBBPA) is a brominated flame retardant.
Contents |
TBBPA is a derivative of bisphenol A and is synthesized from this substance. Most commercial TBBPA products are of a relatively low purity, in fact containing a mixture of products brominated to varying extents. This is not generally considered to be a drawback, since in most applications of this substance (i.e. flame-retarding) it is the average %Br that is of importance. The mixture resulting from the bromination of bisphenol A is therefore not purified, allowing a more efficient, lower cost product.
TBBPA can be used as reactive and additive flame retardant. In the reactive application, TBBPA is bound chemically to the polymers. The main use are epoxy resins of printed circuit boards. As an additive flame retardant it is used in acrylonitrile butadiene styrene, which are used e.g. in TVs. The annual consumption worldwide has been estimated as 119,600 tons in 2001, of which 11,600 tons were used by the European industry.[2]
TBBPA emits from different processes to the environment and can be found in trace concentration in the atmosphere, hydrosphere, soil, and sediments. It also occurs in sewage sludge and house dust.[3] TBBPA has been the subject of an eight year evaluation under the EU Risk Assessment procedure which reviewed over 460 studies. The Risk Assessment was published on the EU Official Journal in June 2008.[4] TBBPA will now go through REACH registration.