All our cord can be supplied in bulk on spools or cut to length as required. Spool lengths vary by size, so please ask when ordering. But joined rings are also available upon request.
Nitrile, Buna-N O-Rings Cord (NBR):
Nitrile, also known as Buna-N or NBR, is a copolymer of Butadiene and Acrylonitirle. It is the most commonly used elastomer for sealing products. It has a temperature range of -40F to +250 F and is exceptionally resistant to petroleum base oils and hydrocarbon fuels. Nitrile materials also exhibit excellent tensile strength and abrasion resistance properties. The material performs well with most dilute acids, silicone oils and lubricants and in water applications. It is not recommended for use with ketones, aromatic hydrocarbons and phosphate ester hydraulic fluids. More than 50% of the Orings sold are Nitrile Orings, commonly used in hydraulic/pneumatic motors, cylinders, pumps and valves.
Buna-N / Nitrile Recommended uses:
Ethylene glycol base fluids (Hydrolubes)
Di-ester base lubricants (MIL-L-7808)
Silicone greases and oils
General purpose sealing.
Petroleum oils and fluids.
Hydraulic fluids
Cold Water.
Nitrile is not recommended for:
Halogenated hydrocarbons (carbon tetrachloride, trichloroethylene)
Phosphate ester hydraulic fluids (Skydrol, Fyrquel, Pydraul).
Nitro hydrocarbons (nitrobenzene, aniline)
Ketones (MEK, acetone)
Automotive brake fluid
Strong Acids Ozone
70 Shore A NBR O Ring Cord Properties
|
Item |
Viton/FKM |
Test Method |
|
Color |
Brown |
- |
|
Specific gravity |
1.3/cm3 |
ASTM D297 |
|
Hardness |
70 Shore A |
ASTM D2240 |
|
Tensile strength |
10 MPa (min) |
ASTM D412 |
|
Elongation at break |
250% (min) |
ASTM D412 |
|
Size |
3mm to 50mm diameter |
- |
|
Compression set 22hrs @100oC % |
6 |
ASTM D 395B |
|
Low temperature resistance |
-20 °C |
ASTM D1329 |
|
Temperature range |
-25°C to +120°C |
ASTM D2000 |
