Rubber Material Special material HNBR - Hydrogenated Nitrile Butadiene Rubber
HNBR - Hydrogenated Nitrile Butadiene Rubber
Hydrogenated nitrile butadiene rubber, also known as HNBR, is a synthetic polymer that is a modified form of nitrile rubber. It is produced by applying a hydrogenation process to nitrile rubber, resulting in improved properties such as increased resistance to heat, oils, and chemicals.
The properties of hydrogenated nitrile depend on the acrylonitrile content and the degree of hydrogenation of the butadiene copolymer. The main difference between NBR and HNBR is that HNBR has better oil and chemical resistance, and it can also withstand much higher temperatures.
Like NBR, HNBR has excellent resistance to oils and fuels, but it also has excellent resistance to many chemicals, heat (steam/hot water) and ozone. The mechanical properties such as tensile and tear strength, elongation, and abrasion resistance are also excellent. In addition, HNBR has good dynamic behavior at elevated temperatures.
Disadvantages include limited resistance to aromatic oils and polar organic solvents, poor electrical properties and poor flame resistance.
HNBR combines the advantageous properties of oil resistance and chemical resistance with improved heat resistance and ozone resistance. Hydrogenated nitrile rubber is therefore used in applications subjected to prolonged exposure to heat, oils, and chemicals.
Characteristics
HNBR - Hydrogenated Nitrile Butadiene Rubber
HNBR is in most respects a better version of NBR. Primarily with improved properties when it comes to heat and ozone resistance.
- Maximum temperature: 125°C
- Minimum temperature: -25°C
- Tensile strength: 3
- Compression set at -30 to +70°C: 2-3
- Compression set at +70 to +150°C: 4
- Abrasion resistance: 3
- Oil and gas resistance: 3-4
- Weather and ozone resistance: 5
- Heat aging: 4
- Adhesion to metal: 3
- Adhesion to textile: 3
Rating scale for table
5 - Excellent / 4 - Very good / 3 - Good / 2 - Fair / 1 - Poor
Products in HNBR - Hydrogenated Nitrile Butadiene Rubber
Hydrogenated Nitrile Butadiene Rubber (HNBR) bridges the gap between NBR and FKM in many applications where resistance to heat and aggressive media is simultaneously required. Hydrogenated nitrile is very commonly found in the automotive industry, but it is also common in other industries.
Below are some examples of products made with hydrogenated nitrile rubber:
Seals and gaskets: HNBR is used for the manufacturing of seals and gaskets in the automotive industry, oil and gas sector, and chemical industry. Its properties, such as high temperature tolerance, oil resistance, and chemical resistance, make it a material used when the requirements are high to create sealing properties in, for example, engines, hydraulic systems, and piping systems.
O-rings and seals: Nitrile rubber is used in the manufacturing of O-rings and seals that are exposed to high temperatures and chemicals. Therefore, they are commonly found in the oil and gas industry and in processing plants where seals need to withstand aggressive chemicals and extreme temperatures.
Hoses and pipes: HNBR can also be used for the production of hoses and pipes and is suitable for applications where, for example, oils, fuels, and chemicals are transported.
Membrane and Sealing Systems: Hydrated nitrile is an important component in the manufacture of membranes and sealing systems that require high performance and safety, such as valves, pumps, and compressed air and gas applications.
Driving belts: HNBR is also used for manufacturing driving belts for automotive engines. Its high temperature resistance, aging resistance and mechanical strength make it a suitable material for this particular application.