Product Description

NBR Nitrile Buna-N O-Rings Seals Gaskets

Buna O-rings, NBR or Nitrile O-rings offer excellent sealing properties and mechanical properties with low cost. Buna and Nitrile O-rings have a basic resistance to common lubricants and are recommended for crude oil, gasoline, propane, petroleum oils and water. Nitrile and Buna O-rings are used in engines, gearboxes, aircraft pumps, and common water applications.

Nitrile Buna-N NBR O-Rings are used as a face-to-face or shaft seals, and allow rotary and linear movement. Nitrile O-rings have good tear and abrasion resistance with operating temperature: -30° to +250F° (can be increased to higher temperature sealing in special compounds).

Note: Nitrile / Buna / NBR o-rings do have limitations to ozone, sunlight and weathering. They are also not good in strong acids, aircraft or automobile brake systems, or ketones.

Advantages

• Good resitance to Petroleum greases, mineral oils, vegetable oils

• Good chemical compatibility and resistance

• Good abrasion and wear resistance

• Good compression set resistance

• Good Permeation Resistance

• Good oil resistance., etc

Application

• Dilute acids, alkali and salt solutions at low temperature

• Petroleum base oils and fluids, mineral oils,

• Silicone greases, di-ester base lubricants

• HFA, HFB and HFC hydraulic fluids

• Ethylene glycol base fluids

• Chemical resistace

• Water., etc

NBR Properties

Item	NBR	Test Method
Color	Black
Specific gravity	1.35/cm3	ASTM D297
Hardness	40°-95° Shore A	ASTM D2240
Tensile strength	9 MPa (min)	ASTM D412
Elongation at break	350% (min)	ASTM D412
Size	Varies
Compression set 100°C 22 hrs	13-25%	ASTM D 395B
Tear resistance	25 kg/cm (min)	ASTM D624
Temperature range	-25°C to +120°C

Kinds of Rubber Properties

Common name	Neoprene	EPDM	Nitrile	Silicone	Viton	Kalrez
Chemical Compatibility
Lubricating and Fuel Oils		X		X
Hydraulic Oils		X
Fireproof Hydraulic Fluids					X
Vegetable Oils, Animal Fats
Gasoline (high octane)	X	X		X
Kerosene		X		X
Aromatic Hydrocarbons	X	X	X	X
Aliphatic Hydrocarbons		X		X
Alcohols
Ketones	X		X	X	X
Halogenated Solvents	X	X	X	X
Water (>80°C)
Concentrated Acids	X	X	X	X
Diluted Acids			X	X
Alkalis					X
Properties
Max. Continuous temp °C	105	150	121	204	204	316
Low Temperature °C	–50	–54	–25	–85 to –125	–8 to -30	–8
Tensile Strength, MPa	25	17	27	10	20	15
Hardness Shore A	30–95	40–90	40–95	30–90	55–95	65-95