HNBR Hydrogenated Nitrile Butadiene Rubber Sheet
Hydrogenated Nitrile Butadiene Rubber (HNBR), also known as Highly Saturated Nitrile (HSN), is a special class of nitrile rubber (NBR) that has been hydrogenated to increase saturation of the butadiene segment of the carbon polymer backbone. By hydrogenating the nitrile copolymer, HNBR fills the gap left between NBR, EPDM and FKM elastomers where high temperature conditions require high tensile strength while maintaining excellent resistance to motor oils, sour gas, amine/oil mixtures, oxidized fuels, and lubricating oils.
HNBR is resistant to mineral oil-based hydraulic fluids, animal and vegetable fats, diesel fuel, ozone, sour gas, dilute acids & bases. HNBR also resists new bio-oils (biological oils). HNBR is suitable for high dynamic loads and has a good abrasion resistance
Limitations:
Like Nitrile, Hydrogenated Nitrile is not recommended for exposure to ethers, esters, ketones, or chlorinated hydrocarbons.
Advantages
• High tensile strength and good physical properties at high temperatures
• High strength, helps reduce extrusion and wear
• Good abrasion resistance and oil resistance
• Superior heat resistance up to 140°C
• Superior mechanical characteristics
• Superior environmental resistance
• Improved resistance to polar fluids
• Good Chemical resistance
• Cold flexibility
• Cars
Application
• Dilute acids, bases and salt solutions at moderate temperature
• Actuator seals for gear box applications
• HFA, HFB and HFC hydraulic fluids
• Vegetable and animal fats and oils
• Water and steam up to 149°C
• Air conditioning applications
• Used for general purpose
• Automotive applications
• Refrigerents
• Gaskets., etc
HNBR Properties
|
Item |
HNBR |
Test Method |
|
Color |
Black |
|
|
Specific gravity |
1.3-1.6g/cm3 |
ASTM D297 |
|
Hardness |
55°-85° Shore A |
ASTM D2240 |
|
Tensile strength |
18 MPa (min) |
ASTM D412 |
|
Elongation at break |
300% (min) |
ASTM D412 |
|
Size |
Varies |
|
|
Compression set 150°C 22 hrs |
Permanent set 18%(max) |
ASTM D 395B |
|
Low temperature resistance |
-30 |
ASTM D1329 |
|
Temperature range |
-35°C to +150°C |
ASTM D2000 |
Chemical Compatibility Overview
|
HNBR |
Excellent |
Good |
Fair |
Poor |
|
Aliphatic Hydrocarbons |
1 |
|
|
|
|
Automatic Transmission Fluid |
1 |
|
|
|
|
Automotive refrigerants |
1 |
|
|
|
|
Brake Fluids Non-Petroleum |
|
|
3 |
|
|
Chlorinated Hydrocarbons |
|
|
|
4 |
|
Dilute Acids |
1 |
|
|
|
|
Hydraulic Fluids HFA, HFC, HFB |
1 |
|
|
|
|
Polar Solvents (Keytones) |
|
|
|
4 |
|
Salt Solutions |
|
2 |
|
|
|
Silicone Oils |
1 |
|
|
|
|
Strong Acids |
|
|
|
4 |
|
Vegetable & Animal Fats / Oils |
1 |
|
|
|
|
Water & Steam up to 300ºF |
1 |
|
|
