O-Ring 018, 18.77x1.78mm NBR 90A Black AS568-018

AS568-018 O-Ring made of 90A NBR (Nitrile), one of the most widely used sealing materials in the industry. Resistant to mineral oils, fuels, hydraulic fluids, and greases.

• ID (inner diameter): 18.77 ± 0.38 mm
• CS (cross-section): 1.78 ± 0.08 mm
• Material: NBR (Nitrile Butadiene) 90 Shore A
• Color: Black
• Standard: AS568-018
• Operating temperature: -40°C to +120°C
• Applications: hydraulic systems, pneumatic systems, pumps, compressors, fittings

✅ Compatible with:

• Mineral and hydraulic oils
• Fuels (gasoline, diesel)
• Water, air, and non-aggressive gases
• Greases and lubricants
• Mineral compressor oils

❌ Not recommended for:

• Aromatic solvents (toluene, benzene, xylene)
• Ketones (acetone, MEK, MIBK)
• Esters (ethyl acetate, butyl acetate)
• Concentrated acids (sulfuric, nitric, hydrochloric)
• PAG and POE oils (used in automotive AC systems)