Octabromodiphenyl ether

  • Octa-BDE
  • Octa -BDE
  • 2,4,5- tribromophenoxy - pentabromobenzene

White solid

Fixed

2.9 g · cm -3

> 300 ° C ( decomposition)

6.59 uPA (21 ° C)

Very poorly soluble in water

Risk

Template: Infobox chemical / molecular formula search available

Octabromodiphenylether ( octa-BDE ) is a flame retardant, and belongs to the group of polybrominated diphenyl ethers ( PBDE).

Use

Octa-BDE was used with antimony trioxide as a synergist especially in black ABS plastic. Other plastics, which were flame retardant with the substance were HIPS, PBT and polyamide polymers. Typical use concentrations were 12-15%. The annual consumption in 2001 was estimated at 3790 tons worldwide, of which about 610 tons were used in European industry. Used here was a mixture consisting of various congeners, which in addition to diphenyl ethers with eight well as those with five ( pentabromodiphenylether ), six ( hexabromodiphenyl ), seven ( Heptabromodiphenyl ether ), nine ( Nonabromdiphenylether ) and ten bromine atoms ( decabromodiphenyl ether ) were included.

There are shown only congeners with more than 1%.

In electrical an average concentration of 530 ppm was found in a 2003 study, which confirmed the widespread occurrence of octa-BDE in electrical equipment.

Environmental relevance

Because of its toxicity, persistence and tendency to bioaccumulate, the substance in 2004 in the EU, Switzerland, Norway, and other countries was banned. In the U.S., 10 states have outlawed the use of octa-BDE (California, Hawaii, Illinois, Maine, Maryland, Michigan, New York, Oregon, Rhode Iceland, and Washington ). Some congeners of commercially occupied octa-BDE have been added to the list of the Stockholm Convention on Persistent Organic Pollutants ( POPs ). The recycled material, for some products, contain, granted exceptions. In Germany, the industry has already decided in 1986, a voluntary agreement to refrain from using. Octa-BDE passes through various processes in the environment and is found in the environmental air, water, soil, river sediments. In the sewage sludge and in the house dust, it is found. In the U.S. and Canada, the values ​​in house dust are much higher than in Europe. In a survey conducted by WWF study octa-BDE was found in the blood of European parliamentarians. Also in breast milk, it can be proven.

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