Dichtomatik N70249 75100178 NBR 70 O-Rings

Dichtomatik Dichtomatik N70249

UPC: | UNSPSC: 31401503 | GTIN:

Gaskets & Packing > O-Rings & O-Ring Kits > O-Rings

DICHTOMATIK O-Ring, 4.859 in Inside Dia, 5.137 in Outside Dia, Cross Section: 0.139 in, Circular Torus Cross Section, Dash Number: 249, 70 Shore A Durometer, 40 to 120 deg F, Nitrile Rubber, Black, Import

Features:

• Good chemical resistance to mineral oils and greases
• The physical and chemical resistance properties of NBR materials are determined by the acrylonitrile (ACN) content of the base polymer which can vary between 18 and 50%
• Low ACN content ensures good flexibility at low temperatures, but offers limited resistance to oils and fuels
• As the ACN content increases, the low temperature flexibility reduces and the resistance to oils and fuels improves
• Physical and chemical resistance properties of NBR materials are also affected by the cure system of the polymer
• Peroxide cured materials have improved physical properties, chemical resistance and thermal properties as compared to sulfur-donor-cured materials
• Standard grades of NBR are typically resistant to mineral oil-based lubricants and greases, many grades of hydraulic fluids, aliphatic hydrocarbons, silicone oils and greases and water to about 80 deg C
• NBR is generally not resistant to aromatic and chlorinated hydrocarbons, fuels with a high aromatic content, polar solvents, glycol based brake fluids and non-flammable hydraulic fluids (HFD)
• NBR also has low resistance to ozone, weathering and aging, but in many applications this has no negative effect

Specs:

Certifications/Standards:

DNV Approved | FDA Compliant | ISD Certified | NFPA Listed | PTDA Certified