ISOLENE® 40-S is a low-molecular-weight liquid polymer derived from synthetic polyisoprene rubber. It offers the performance of natural rubber with the added benefit of a lighter color and none of the natural impurities inherent in natural rubber products. ISOLENE® 40-S is a lower viscosity liquid than the other ISOLENE® liquid rubber products. It is a translucent, honey-colored liquid in bulk form and virtually clear in a thin film.

Polymer Name: Polyisoprene (IR)

Chemical Family: Polyisoprenes

Functions: Binder & Resin, Extender, Processing Aid, Rheology Modifier

Labeling Claims: Impurities-free

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Enhanced TDS

Identification & Functionality

Features & Benefits

Applications & Uses


Physical Form
Light amber
Technical Data
ValueUnitsTest Method / Conditions
Typical Viscosity Range (at 38°C)36,000 - 55,000cP-
Colormax. 8-Visual, Gardner
Glass Transition Temperature-65.0°C-
Specific Gravity0.92-ASTM D1875
Density7.7lb/galASTM D1875
Average Molecular Weight32000.0-GPC
Volatiles0.87wt %ASTM D1416
Ash Content0.1wt %ASTM D1416
Solid Content100.0%-
Unsaturation92.0Mole %Ozone Analysis

Technical Details & Test Data


ISOLENE® 40-S is a low molecular weight grades of synthetic polyisoprene. They are viscous liquids at typical processing temperatures. The following table indicates the viscosity (cp) at typical conditions.

Temperature Viscosity (cP)
25°C 120,000
66°C 7,000
93°C 2,300
80°C 1,000
121°C 3,300
149°C 500
38°C 40,000
149°C 15,000

Packaging & Availability

Packaging Type
Regional Availability
  • Global (Excluding Russia)
Typical Packaging

Typical Packaging ISOLENE® 40-S is available in the following standard packages:

  • 34 lb. steel pail
  • 350 lb. steel drum

Storage & Handling

Shelf Life
2 Years
  • ISOLENE® products are viscous polymers. Heating the drums lowers the viscosity for easier handling. Vent the drums before heating to avoid pressure build up.
  • Avoid exposing ISOLENE® products to temperatures above 121°C. The polymer may form a skin and it may darken.
  • ISOLENE® polymers can be compounded with virtually any type of rubber processing equipment. Processing requirements vary with the desired finished properties and with the other formulation ingredients.
Storage Condition

Store in a dry environment to prevent damage to the packaging. The liquid rubber products are stable over a wide temperature range. They are not damaged by freezing temperatures or occasional short-term exposure to temperatures of 66°C.