GRADE

Binder

Nitrile

Nitrile

Nitrile

Nitrile

Cork Grain Size

1 to 2mm

0.5 to 1mm

0.5 to 2mm

0.5 to 1mm

Hardness IRHD

500+5

700+5

700+5

700+5

Tensile Strength

(Kgf/cm2)

12.75 min

12.75 min

15.50 min

15.50 min

Flexibility (thickness x 4)

No Cracks

No Cracks

No Cracks

No Cracks

Compressibility

At 28 kg/cm2 (%)

35 – 45

35 – 50

25 – 35

25 – 35

Density (gm/cc)

0.65 – 0.75

0.75 – 0.85

0.85 – 0.95

0.75 – 0.85

Compression Set at

(110+5)0 C for 24+0/-2 hrs. (Recovery 1hr)

80 % max

85 % max

85 % max

85 % max

pH Value

5.0 – 8.5

5.0 – 8.5

5.0 – 8.5

6.0 – 8.5

Recovery

80% min

80% min

80% min

80% min

Volume change after Immersion in ASTM OIL no.3 /transformer oil for 70 hrs at (100+2)0 C

15% max

Recommended as a high quality material for use extensively where the application requires both good oil and heat resistance. Ideally suitable for Distribution Transformer Switchgears and Oil immersed starter.

25% max

A good oil resistant material having good flex properties and high hardness. This is ideally suitable for Automotive and Transformer Gaskets Excellent sealing and rebound resilience properties are offered due to incorporation of Virgin Cork Granules with a combination of Nitrile Polymers. This Material is best for use in the Automotive and Transformer Industry.

15% max

This is suitable for the Transformers and Engineering Application Material having high hardness manufactured from Cork Granules providing excellent oil and heat resistant properties & excellent Compression Set. Widely used by Electricity boards and transformer manufacturers.

8% max

This is suitable for heavy engineering applications. A material having high hardness manufactured from fine cork granules providing excellent oil heat and ozone resistant properties. Its excellent Compression Set and side flow properties control lateral spread tendency of ordinary cork sheets and is therefore, best suited for Outdoor transformers. Widely used by Electricity Authority and Transformer Manufacturers