The Universal Selection Source:
Polymer Additives

X 266-S®

Technical DataSheet | Supplied by Evonik

X 266S® by Evonik is bis(triethoxysilylpropyl)polysulfide. Contains organosilane Si 266® and an N 330 type carbon black in the ratio 1:1 by weight. Acts as a filler. The product is applied in the rubber industry in combination with white fillers containing silanol groups. Imparts greater tensile strength, higher moduli, reduced compression set, increased abrasion resistance and optimized dynamic properties. It has a higher temperature stability and therefore allows higher mixing temperatures. X 266S® is suitable for use in low rolling resistance tires. It has a shelf life of 12 months.

X 266-S® Product details

Product Type
Chemical Composition
Physical Form
Product Status
Applications/ Recommended for
Labels/Agency Rating

X 266-S® Properties


Value & Unit
Test Condition
Test Method
Sulfur content, ASTM D6741
xxx %
Active substance
xx %
Average molecular weight of active substance
xxx g/mol
Pour density, ASTM D1513
xxx g/l
Average sulfur chain length of active substance, HPLC, ASTM D 6844
Volatile content, ISO 7872
xxx %
Last edited Nov 29, 2016
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