TECHNOLOGY

Material

HNBR (Hydrogenated Nitrile Butadiene Rubber)

Hydrogenated nitrile butadiene rubber (HNBR) or highly saturated nitrile rubber (HSN)
  • Due to the high temperature of the conditions of use and the request for life, this material has highly hydrogenated the double bond of butadiene, which was a weakness of NBR. H-NBR has a different acrylonitrile (ACN) content for each polymer, and the content of ACN is various ranging from 17% to 49%.
  • Low ACN content improves the properties at low temperatures, decreases resistance to fuel and polar lubricants, while high ACN content decreases the properties at low temperatures but improved resistance to fuel and polar lubricants. Typically, standard H-NBR contains 36% ACN.
  • It has satisfactory aging resistance and oil resistance as well as excellent weather resistance, ozone resistance, and abrasion resistance. Its use is expected to further expand, and recently, a third substance has been added for copolymerization to develop H-NBR with improved resistance to low temperatures.
Application
  • It is used in automotive air conditioning and shaft systems with R134 refrigerant gas or new eco-friendly refrigerants such R401a, R404a, R410a, R507 and R774.
Property table of materials (ASTM D2000)

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Raw material name Hardness (±5) Tensile strength (kg/cm2) Elongation ratio (%) Commercial temperature (°C)
H-NBR 40 ~ 90 71 ~ 204 100 ~ 300 -32 ~ 135