WESTCO™ MMBI 4-and5-methyl-2-mercaptobenzimidazole CAS# 53988-10-6

WESTCO™ MMBI is non-discoloring, non-staining antioxidant for all rubbers. It is particularly effective in NBR and EPDM. It provides very good heat-aging and flex protection when used in combination with WESTCO™ TMQ.


Appearance: Off white to light yellow powder or oiled powder
*Melting Point

270°C Min.


0.5% Max.


0.5% Max.

*Sieve residue (100 mesh)

0.1% Max.

*Sieve residue (230 mesh)


Specific Gravity, typical


Oil Content


*Reported on certificate of analysis.

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  • Western Reserve Chemical
  • 4837 Darrow Road
  • Stow, OH 44224

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