Project details

NBR and HNBR are both types of nitrile rubber, but their molecular structure and properties are different.

NBR is a conventional type of nitrile rubber that does not contain hydrogen atoms in its molecular structure, thus possessing good oil resistance and heat resistance. Its operating temperature range is -30 ℃ to+110 ℃, and it can maintain good sealing performance in most common oils and chemicals. However, it is not resistant to chemical substances such as high temperature, low temperature, acid and alkali, and is also not tolerant to polar solvents.

HNBR is a hydrogenated type of nitrile rubber that contains hydrogen atoms in its molecular structure, resulting in better high-temperature and oil resistance. Its operating temperature range is -20 ℃ to+150 ℃, which has a wider operating temperature range than NBR. In addition, HNBR also has better acid and alkali resistance, aging resistance, ozone resistance, and good resistance to polar solvents.

Therefore, when selecting NBR and HNBR O-rings, it is necessary to make the selection based on the actual usage requirements. If better high-temperature and oil resistance are needed, it is recommended to choose HNBR O-ring; If you don't need such high temperature and oil resistance, you can choose a cheaper NBR O-ring.