East Materials
MESIL®

MESIL 107 — Hydroxyl Terminated Polydimethylsiloxane (OH Polymer)

MESIL 107 polymers are intermediates for most room temperature vulcanizeable (RTV) silicones, available in 20,000, 50,000, and 80,000 cps viscosity grades.

CAS
70131-67-8
Category
silicone-oils
Updated
2026-05-14

Overview

MESIL 107 polymers are intermediates for most room temperature vulcanizeable (RTV) silicones. The product is a hydroxyl terminated polydimethylsiloxane (CAS 70131-67-8), supplied as a colorless clear liquid in three viscosity grades: 107-20K (20,000 cps), 107-50K (50,000 cps), and 107-80K (80,000 cps).

Technical Specifications

PropertyUnitValue
CAS No.70131-67-8
Color and AppearanceColorless clear liquid
Density (25/25°C)g/cm³0.96–0.98
Refractive Index (25°C)1.401–1.403
Viscosity (107-20K)cps20,000
Viscosity (107-50K)cps50,000
Viscosity (107-80K)cps80,000
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Applications

  • Electronics, semiconductors, automobiles, machinery, textiles, plastics, printing, construction
  • Condensation cure one-part and two-part RTV systems
  • Filler treatments and structure control additives in silicone rubber compounding
  • Textile applications as durable fabric softeners
  • Matrix component in tackifiers and pressure-sensitive adhesives

Packaging & Storage

Supplied in 200 kg steel drums or 950 kg IBC drums. 20' GP FCL capacity: 80 steel drums (16,000 kg) or 18 IBC drums (17,100 kg). Shelf life: 12 months stored unopened in dry, cool conditions.

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