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Brominated flame retardants - tetrabromobisphenol A
Tetrabromobisphenol A short TBBA or TBBPA, a brominated aromatic flame retardants commonly used. Tetrabromobisphenol A can be manufactured as a reactive flame retardant containing bromine and bromine-containing polycarbonate resin, can be used as intermediates in the synthesis of other complex flame retardants, in addition tetrabromobisphenol A type of resistance can also be added as flame retardants for ABS, HIPS, unsaturated polyester, rigid polyurethane foam, adhesives and coatings.

The dangers of brominated flame retardants
Tetrabromobisphenol A with polybrominated biphenyls (PBB), polybrominated diphenyl ethers (PBDE), six bromo-dodecane (HBCDD), are often used as flame retardants are halogen compounds, halogen compounds such flame retardants can not be recycled, although in the combustion process in the dissemination of halogenated gases can quickly absorb oxygen, the fire extinguished, but the release of chlorine gas is highly toxic, affecting the respiratory system. In addition, halogen-containing polymers released from the combustion of halogen compounds in combination with water vapor, will produce corrosive gases (such as hydrogen halide), for some equipment and buildings caused by corrosion.

Tetrabromobisphenol A limit
Tetrabromobisphenol A with polybrominated biphenyls (PBB), polybrominated diphenyl ethers (PBDE) flame retardants such as brominated flame retardant is used more, mainly used in electrical and electronic industries, including: circuit boards, computers, fuel batteries, televisions and printers.
The halogen-containing flame retardant materials, produce dioxins when burned, and in the environment can exist for years or even life-long accumulated in the organism, can not be discharged. Therefore, many large international companies are actively promoting the complete abolition of halogen-containing materials, such as the prohibition on the use of halogen flame retardants and other products.

At present the requirements for halogen-free, the major basic well-known enterprises limited by the following criteria:
· IEC 61249-2-21 halogen limited requirements: chlorine limit of 900PPM, bromine limit of 900PPM, total halogen (bromine + chlorine) shall not exceed 1500PPM;
· PCB board substrate, plastic, solder resist in the halogen content of the test based on the standard EN14582, IEC61189-2 2006;
* In particular, for the halogen-free cable:
Resulting from the combustion of hydrogen halide content <100PPM (according to standard EN 50267-2-1);
Burning hydrogen halide generated from water soluble PH value ≧ 4.3 (weak acid) (according to standard EN 50267-2-2);
* Products after combustion in a closed container through a beam of light transmittance rate ≧ 60% (according to standard EN 50268-2);