- O-Rings: O-rings are circular elastomer rings with a round cross-section, typically fixed in grooves and compressed by two or more components to create a sealing interface. They are commonly used in places like oil cylinders, chain links, pipelines, and pistons. In addition to general industrial O-rings, LeeKuma provides customers with material selection for automotive O-rings according to the JASO standard.
- Material Types (7 Types for Automotive O-Rings): Class 1A (for general mineral oils), Class 2 (for gasoline resistance), Class 3 (for brake oil), Class 4C (for heat resistance), Class 4D (for heat resistance), Class 4E (for heat resistance), Class 5 (for coolant use).
This specification has clear requirements for temperature resistance and oil immersion tests to ensure vehicle safety during operation. - Basic Physical Properties of Common Materials:
| Test Item | 1A | 2 | 4C | 4D | |
|---|---|---|---|---|---|
| Aging | Temperature | 120°C | 100°C | 230°C | 230°C |
| Time | 70h | 70h | 24h | 24h | |
| Hardness Change | 10 | 10 | 10 | 5 | |
| Tensile Strength (%) | -15 | -15 | -10 | -10 | |
| Elongation Change (%) | -45 | -40 | -25 | -25 | |
| Compression Set | Temperature | 120°C | 100°C | 175°C | 175°C |
| Time | 70h | 70h | 22h | 22h | |
| Compression Set (%) | 40 | 25 | 30 | 40 | |
| Cold Test | Brittle, Non-cracking Temperature | -13 | -10 | -50 | -15 |
| Immersion Test 1 | Temperature | 120°C | 23°C | 175°C | 175°C |
| Time | 70h | 70h | 70h | 70h | |
| Test Oil | Lubricating Oil No.1 | Lubricating Oil No.1 | Lubricating Oil No.1 | Lubricating Oil No.1 | |
| Hardness Change | -5~+8 | -8~0 | -10~+5 | -10~+5 | |
| Tensile Strength (%) | -15 | -15 | -20 | -20 | |
| Elongation Change (%) | -40 | -25 | -20 | -20 | |
| Volume Change (%) | -8~+5 | -3~+5 | 0~+10 | -5~+5 | |
| mmersion Test 2 | Temperature | 120°C | 23°C | - | 175°C |
| Time | 70h | 70h | - | 70h | |
| Test Oil | 潤滑油No.3 | 燃料油No.2 | - | 潤滑油No.3 | |
| Hardness Change | -15~0 | -20~0 | - | -10~+5 | |
| Tensile Strength (%) | -25 | -45 | - | -20 | |
| Elongation Change (%) | -35 | -45 | - | -20 | |
| Volume Change (%) | 0~+20 | 0~+30 | - | ~5+5 | |
(This excerpt is from JASO F404-96)
LeeKuma offers O-rings with sizes conforming to JIS-B-2401 and AS-568 standards for customer selection.
LeeKuma offers O-rings with sizes conforming to JIS-B-2401 and AS-568 standards for customer selection.