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  • No : 5689
  • Date of Issue : 2021/04/28 13:40
  • Last Updated : 2021/05/20 08:52
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(EDX) Is it possible to distinguish PBB and PBDE with EDX?

I am performing a RoHS analysis with the EDX. With the EDX, is it possible to distinguish PBB and PBDE?
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Answer

• With the EDX, compounds cannot be distinguished.
  Perform screening analysis with respect to total Br content.
• If knowing the total Brcontent of a sample is not enough, it can be analyzed with a different instrument in order to identify the compound.
 
PBB and PBDE
PBB: Polybrominated biphenyls: C12H (10−n) Brn (1≦n≦10)
PBDE: Polybrominated diphenyl ether: C12H (10−n) BrnO (1≦n≦10)
 
Relationship Between Maximum Permitted PBB/PBDE Content and Br Concentration
- Br concentration less than 1,000ppm mono-BB: 1000×80/233 = 343ppm
- Br concentration less than 1,000ppm mono-BDE: 1000×80/249 = 321ppm
If the Br content in resin is definitely under 320ppm, then the value will be less than 1,000ppm whatever the PBB/PBDE bromine substitution.
Even if the Br analysis value obtained with the EDX is 640ppm for example, conformity is not a certainty. If this Br is due entirely to mono-BDE, then the PBDE concentration will be 2,000ppm.

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