Rubberised Cork Classified as:- |
Type-A Non Oil Resistent |
Medium Oil Resistent |
Type-B Good Oil Resistent |
Type-C Very Good Oil Resistent |
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Grades & Properties |
RC - 50A TR5 - A |
RC - 70A TR7 - A |
RC - 80A TR8 - A |
RC - 50 TR5 - M |
RC - 70 TR7 - M |
RC - 80 TR8 - M |
RC - 50B TR5 - B |
RC - 70B TR7 - B |
RC - 80B TR8 - B |
RC - 50C TR5 - C |
RC - 70C TR7 - C |
RC - 80C TR8 - C |
Hardness 1RHD | 50+/- 5 | 70+/-5 | 80+/- 5 | 50+/- 5 | 70+/- 5 | 80+/- 5 | 50+/- 5 | 70+/- 5 | 80+/- 5 | 50+/- 5 | 70+/- 5 | 80+/- 5 |
Dimensional Changes % Max | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 |
Tensile Strenght Kpa : Min | 650 | 900 | 1250 | 650 | 900 | 1250 | 700 | 1250 | 1550 | 1250 | 1550 | 1900 |
% Compressibility (at 2800 kpa) | 45 - 65 | 30 - 45 | 15 - 30 | 45 - 60 | 30 - 45 | 15 - 30 | 45 - 60 | 35 - 50 | 25 - 35 | 35 - 45 | 25 -35 | 15 - 25 |
% Recovery - Min | 80 | 80 | 75 | 80 | 80 | 80 | 80 | 80 | 75 | 80 | 80 | 75 |
% Compression Set Max | 90 | 90 | 90 | 85 | 85 | 90 | 80 | 85 | 90 | 80 | 85 | 90 |
Fluid Resistent Test (a) Volume change after immersion in ASTM oil No.3 for 70 HRS at 100 |
N.A. | Max 40% | Max 25% |
Max15% |
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(b) Volume change after immersion in IS.335 oil (transformer oil) |
- | - | - | Max 8% | ||||||||
Chemical Test on Water Extract | ||||||||||||
(a) Ph, Where applicable | 5 - 8.5 | 5 - 8.5 | 5 - 8.5 | 5 - 8.5 | ||||||||
(b) Chloride Content (as chloride ion) |
0.2% Max | 0.2% Max | 0.2% Max | 0.2% Max | ||||||||
(c) Sulphate Content (as Sulphate ion) |
0.2% Max | 0.2% Max | 0.2% Max | 0.2% Max | ||||||||
Gaskets Suitable for |
General Purpose light Electrical & General Automotive industry |
General Purpose Automobile industry |
Automobile industry Light Electrical Industry |
Automobile industry, Heavy Electrical Industry, Ship Building and Aircraft industry |