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Item Properties Materials | Neoprene Rubber (Apply to -25ºC~ 60ºC areas) | Natural Rubber (Apply to -35ºC~ 60ºC areas) | Neoprene Rubber (Apply to -40ºC~ 60ºC areas) | ||
Hardness (IRHD) | 60±5 | 60±5 | 60±5 | ||
Tensile Strength (Mpa) | >=15 | >=16 | >=14 | ||
Elongation at break (%) | >= 400 | >= 400 | >= 350 | ||
Brittleness temperature (ºC) | <=-40 | <=-50 | <=-60 | ||
Compression set constant (Room temperature ×24h) | <=20 | <=20 | <=20 | ||
Resistant Ozone aging (25~50pphm) 20% Elongation 40ºC×96h | No cracks | No cracks | No cracks | ||
Hot air aging test (Compared with the previous unaged value occurred biggest change ) | Test conditions(ºC×h) | 70ºC×96h | 70ºC×96h | 70ºC×96h | |
Tensile Strength (%) | ±15 | ±15 | ±10 | ||
Elongation at break (%) | ±25 | ±25 | ±20 | ||
Hardness change(IRHD) | 0~+10 | -5~+10 | 0~+10 | ||
Rubber and steel bonding peel strength(kN/m) | >7 | >7 | >7 | ||
Salt water(23ºC×14d, 4% Concentration) | Volume Change (%) | <=+10 | <=+10 | <=+10 | |
Hardness Change(IRHD) | <=+10 | <=+10 | <=+10 | ||
oil resistance(No.1 Standard Oil, 23ºC×168h) | Volume Change (%) | -5~+10 | <+45 | <+45 | |
Hardness Change(IRHD) | -10~+5 | <-25 | <-25 | ||
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