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The buoyance of natural cork is used to good effect in petrol and oil level gauges, but the most important application of cork in the automotive industries is in cork-and-rubber gaskets. Today, these are as essential as petrol or diesel fuel to the car and truck industries. The material used combine the compressibility and resilience of cork with the high mechanical strength and dimensional stability of rubber, making them the best substances of such automotive applications as oil pan gaskets, valve cover gaskets and timing gear cover gaskets. |
Another important application of cork-and-rubber is as a seal to retain lubricants in crank shaft bearings when pressure is applied, the air within cork cells is compressed, thus exerting a reverse pressure on the restraining faces. This is termed 'fight back' and is a primary requirement in all good gasket materials. Cork-and-rubber can be cut easily, and because it is strong and flexible, it can be used for making gaskets with narrow flanges. A wide variety of formulations used for making gaskets with narrow flanges. A wide variety of formulations using different types of rubber like Natural Rubber, Synthetic Rubber, Nitrile, Neoprene, EPDM Silicone and sizes of cork granuals are available to meet the industry's various requirements. |
| Cork in Electrical Industry |
Special cork-and-rubber have been developed to prevent leakage of the very searching cooling fluids used in modern electrical transformer, similar material are also widely used in switch gear circuit breakers, lightning arresters, and other transmission equipment, as well as in conduit fittings, gear cases and cover plates in washing machines. |
| Rubbers cork gasket materials specification as per is - 4253 part -II 1988 ( ASTM - F-104 ). |
| Mechanical Properties | GR/GCS-R&B | GR/GCS-S&P | GR/GCS-I&II | ||||||
| (Moderate Oil Resistant) | (Good Oil Resistant) | (Very good Oil Resistant) | |||||||
| Grade | RC-50 | RC-70 | RC-80 | RC-50B | RC-70B | RC-80B | RC-50C | RC-70C | RC-80C |
| Hardness IRDH | 50±5 | 70±5 | 80±5 | 50±5 | 70±5 | 80±5 | 50±5 | 70±5 | 80±5 |
| Dimensional change percent max. | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 |
| Tensile Strength Kg/Cm2 (KPa*) Min. | 6.63 (650) | 9.18 (900) | 12.75 (1250) | 7.14 (700) | 12.75 (1250) | 15.50 (1550) | 12.75 (1250) | 15.50 (1550) | 19.50 (1900) |
| Compressibility at 28 Kg/Cm2 (2800 KPa) Percent | 45-60 | 35-50 | 25-35 | 45-60 | 35-50 | 25-35 | 35-45 | 25-35 | 15-25 |
| Recovery Percent Min. | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 |
| Compression Set Percent Max. | 80 | 85 | 90 | 80 | 85 | 90 | 80 | 85 | 90 |
| Chemical Test on water extracts | |||||||||
| a. pH where applicable | 5.0 to 8.5 | 5.0 to 8.5 | 5.0 to 8.5 | ||||||
| b. Chloride content (as chloride ion) | 0.2 Percent Max. | 0.2 Percent Max. | 0.2 Percent Max. | ||||||
| c. Sulphate content (as sulphate ion) | 0.2 Percent Max. | 0.2 Percent Max. | 0.2 Percent Max. | ||||||
| Volume change after immersion in ASTM Oil No.3 for 70 hours at 100°C Temp. | 40 Percent Max. | 25 Percent Max. | 15 Percent Max. | ||||||
| • 1 Kg/cm2=98.0665 KPa | |||||||||
| • Variation in thickness at any point on the sheet is ± 10% for thickness upto 2.50 mm and ±0.25 mm | |||||||||
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