ISOLENE® 400-S is a low-molecular-weight liquid polymer derived from synthetic polyisoprene rubber. It offers the performance and processing characteristics of natural rubber with the added benefit of a lighter color and none of the natural impurities inherent in natural rubber products. ISOLENE® 400-S is a high-viscosity liquid at room temperature. 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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Identification & Functionality

Chemical Family
Chemical Name
Polymer Name
CASE Ingredients Functions
Fluids & Lubricants Functions
Plastics & Elastomers Functions

Features & Benefits

Labeling Claims

Applications & Uses

Compatible Polymers & Resins
Cure Method
Adhesive & Sealant Type
Plastics & Elastomers End Uses


Physical Form
Light amber
Technical Data
ValueUnitsTest Method / Conditions
Typical Viscosity Range (at 38°C)300,000 - 500,000cP-
Colormax. 8-Visual, Gardner
Glass Transition Temperature-65.0°C-
Specific Gravity0.92-ASTM D1875
Density7.7lb/galASTM D1875
Average Molecular Weight65000.0-GPC
Volatiles0.47wt %ASTM D1416
Ash Content0.1wt %ASTM D1416
Solid Content100.0%-
Unsaturation92.0Mole %Ozone Analysis
Flash Point240.0°C-

Technical Details & Test Data


ISOLENE® 400-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 1,000,000
66°C 380,000
93°C 170,000
80°C 110,000
121°C 50,000
149°C 23,000
38°C 13,000
52°C 8,000

Packaging & Availability

Packaging Type
Regional Availability
  • Global (Excluding Russia)

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.