O-Ring Materials - NBR, Buna N
Nitrile rubber is a copolymer of acrylonitrile and butadiene. It has good resistance to petroleum-based fuels and lubricants and is low-priced, making it the most commonly used rubber raw material. However, it has weak resistance to oxidants such as acetone, butanone and other ketones.
Material properties:
● It has excellent wear resistance.
● Good resistance to petroleum-based fuels and lubricants.
● Not resistant to polar solvents, climate and ozone.
Applicable industries:
● Clamping, seals and gaskets, O-rings, sealing washers, pipe fittings, etc.
Best● Better○ Good△ BadX
| Rubber type (ASTM Abbreviation ) | Nitrile Rubber NBR, Buna N | ||
| Chemical structure | Butadiene、Acrylic gel copolymer | ||
| Main feature | Oil resistant, water resistant, abrasion resistant, high oil pressure resistant, non-polar solvent resistant. | ||
| Pure rubber properties | proportion Muni viscosity ML1+ (100℃) | 1.00 ∼ 1.20 30 ∼ 100 | |
| Physical properties of synthetic rubber | Possible JIS hardness range General temperature range(℃) Special temperature range(℃) Tensile strength (kg/cm2) Elongation (%) Anti-elastic Cracking Wear resistance Bending resistance | 40 ∼ 90 -30 ∼ 100 -50 ∼ 120 50 ∼ 250 800 ∼ 100 ○ ○ ● ○ | |
| Various properties of synthetic rubber | lubricating oil | Engine oil Gear Oil Motor oil Shaft lubricant Refrigeration oil Butter Lithium oil Oyster sauce | ● ● ● ● ○ ● ● ● |
| Working oil | Pot shaft oil Oil + Water emulsion system Water + Glycol Phosphate ester Si Brake Fluid Gear oil | ● ● ○ X ● △ △ | |
| Fuel oil | Light oil、kerosene Heavy oil Gasoline | △ △ △ | |
| Water | Water、Warm water Water vapor、Hot water Antifreeze water Water cutting oil | ○ ○ ○ ○ | |
| Drug | Hydrochloric acid 20% | △ ○ X ● X X ○ ● X ● X ∼△ X X ∼△ | |
| Gas | LPG Urban gas Ozone Freon 12 Freon 22 | ○ ○ △ ○ △ | |
| Other | Food Sanitation Law | ○ ● | |
| The main purpose | Fuel tank、Hydraulic oil、Oyster sauce、Grease、Water...Seals。 | ||