Chempol Products

CHEMPOL P25 Ethylene – Propylene – Copolymer (Viscosity Index Improver)

A solid highly stable pellet form co-polymer with narrow molecular weight distribution, intended for use as a Viscosity Modifier in mineral oil based automotive crankcase lubricants and industrial lubricants. Its excellent low temperature properties and high thickening power make it suitable for a wide range of applications.


Property Value
Appearance White pellets
Density (g/cc), ASTM D4052 0.862
Kinematic Viscosity 10% SN150/100(cSt), ASTM D445 2100
Pour Point 1% SN150 + 0.3% PPD (°C), ASTM D97 -24
Shear Stability Index (SSI), ASTM D6002 45
Ash Content (%), ASTM D1416 <0.09
Ethylene Content (%) 48
Mooney Viscosity ML 1+4 (100°C), MU 65


  • Pellet form
  • High thickening power
  • Good viscosity index improver (VII)
  • Very good pour point characteristics

Typical Applications

Designed to be used as a viscosity index improver (VII) and viscosity modifier/thickener in mineral oil based automotive crank case lubricants and industrial lubricants.

Packaging of  Viscosity Index Improver (Ethylene – Propylene – Copolymer)

Available in 25kg bag

Dissolving Method & Viscosity Levels

Polymers should be dissolved under high agitation in oil at 100°C – 160°C for 3-6 hours until all solids have been dissolved. Treat rates of 6-10% will be required depending upon the viscosity grade required and the base oil used. Use with suitable PPD. Consult the CHEMPOL technical department for specific recommendations.

  • 10% of CHEMPOL P25 in Base Oil SN500 produces a Viscosity of 1900 – 2000cst @ 100°C.
  • 11.5% of CHEMPOL P25 in Base Oil SN 150 produces a Viscosity of 1800 – 1900 Cst @ 100°C.

It is generally recommended to make Liquid VI with SN150 Base Oil for a better low pour point while formulating Motor Oils. The index of the oil will be increased based on the grade of the oil used.

Dissolving time
Approx. 3 -6 hours @ 120°C.

Safety, Handling and Storage

Wear a suitable dust mask & gloves when handling polymers. Avoid storing pellet-type polymers >30°C for prolonged periods, and avoid direct sunlight.