Pressure range analysis of O-rings with different materials and hardness

01 Nitrile butadiene rubber (NBR) O-ring

When the hardness range of nitrile rubber O-rings is 40-90±5 Shore A, the use pressure value will increase with the increase of hardness. Lower hardness O-rings are softer and suitable for low pressure and low stress sealing applications, while higher hardness O-rings are more suitable for high pressure applications. The following is A rough reference to the pressure range of O-rings with different hardness: 

Hardness 40±5 Shaw A: Suitable for low pressure applications, usually can withstand pressure of 1-5 MPa (10-50 bar). · Hardness 50±5 Shaw A: The tolerable pressure is usually around 5-10 MPa (50-100 bar). · Hardness 60±5 Shaw A: The tolerable pressure is usually around 10-15 MPa (100-150 bar). · Hardness 70±5 Shaw A: The tolerable pressure is usually around 15-20 MPa (150-200 bar). · Hardness 80±5 Shaw A: The pressure is usually around 20-35 MPa (200-350 bar). Hardness 90±5 Shaw A: The tolerable pressure is usually around 35-50 MPa (350-500 bar).

02 Fluorine rubber (FKM) O-ring

When the hardness range of fluorine rubber O-rings is 50-90±5 Shore A, its use pressure value is similar to that of nitrile butadiene rubber (NBR), and it also increases with the increase of hardness. Fluororubber has better resistance to high temperature and chemical corrosion, and is suitable for use in harsh environments. The following is A rough reference to the pressure range of fluorine rubber O-rings with different hardness: 

Hardness 50±5 Shaw A: suitable for low pressure applications, usually can withstand the pressure of 5-10 MPa (50-100 bar). · Hardness 60±5 Shaw A: The tolerable pressure is usually around 10-15 MPa (100-150 bar). · Hardness 70±5 Shaw A: The tolerable pressure is usually around 15-20 MPa (150-200 bar). · Hardness 80±5 Shaw A: The pressure is usually around 20-35 MPa (200-350 bar). Hardness 90±5 Shaw A: The pressure is usually around 35-50 MPa (350-500 bar).

03 Silicone O-ring

When the hardness range of silicone O-rings is 30-90 Shore A, the use pressure value will generally increase with the increase of hardness. Due to the softness and high temperature resistance of silicone materials, silicone O-rings are usually suitable for low to medium pressure and sealing occasions that require greater elasticity. The following is A rough reference to the pressure range of silicone O-rings with different hardness: 

Hardness 30-40 Shore A: suitable for very low pressure occasions, usually can withstand the pressure of 1-3 MPa (10-30 bar).  

Hardness 50 Shore A: The tolerable pressure is usually around 3-7 MPa (30-70 bar). · Hardness 60 Shore A: The tolerable pressure is usually around 7-10 MPa (70-100 bar). · Hardness 70 Shore A: The tolerable pressure is usually around 10-15 MPa (100-150 bar). Hardness 80 Shore A: The tolerable pressure is usually around 15-20 MPa (150-200 bar). Hardness 90 Shore A: The tolerable pressure is usually around 20-25 MPa (200-250 bar)

04 Ethylene propylene diene rubber (EPDM) O-ring

When the hardness range of EPDM O-ring is 40-90 Shore A, the use pressure value changes with the increase of hardness. EPDM O-rings are widely used in the automotive, industrial and construction industries because of their excellent weather resistance, ozone resistance and chemical resistance. The following is A rough reference to the pressure range of EPDM O-rings with different hardness: 

Hardness 40±5 Shaw A: Suitable for low pressure applications, usually can withstand pressure of 1-5 MPa (10-50 bar). · Hardness 50±5 Shaw A: The tolerable pressure is usually around 5-10 MPa (50-100 bar). · Hardness 60±5 Shaw A: The tolerable pressure is usually around 10-15 MPa (100-150 bar). · Hardness 70±5 Shaw A: The tolerable pressure is usually around 15-20 MPa (150-200 bar). · Hardness 80±5 Shaw A: The pressure can withstand is usually around 20-25 MPa (200-250 bar). Hardness 90±5 Shaw A: The pressure is usually around 25-35 MPa (250-350 bar). It should be noted that although EPDM O-rings have good weather resistance and chemical stability, their pressure resistance is weaker than fluorine rubber (FKM) and nitrile butadiene rubber (NBR). As a result, EPDM O-rings are typically used more in low - and medium-pressure systems, especially in environments that require high temperature resistance, UV resistance, or exposure to oxidizing chemicals.

05 Hydrogenated nitrile butadiene rubber (HNBR) O-ring

When the hardness range of hydrogenated nitrile rubber O-rings is 55-90 Shore A, its use pressure value usually increases with the increase of hardness. HNBR O-rings are better than ordinary nitrile butadiene rubber (NBR) in terms of oil resistance, high temperature resistance and wear resistance, so they perform well in more high-pressure applications. The following is A rough reference to the pressure range of HNBR O-rings with different hardness: 

Hardness 55±5 Shaw A: Suitable for low pressure applications, usually can withstand pressure of 5-10 MPa (50-100 bar). · Hardness 60±5 Shaw A: The tolerable pressure is usually around 10-15 MPa (100-150 bar). · Hardness 70±5 Shaw A: The tolerable pressure is usually around 15-20 MPa (150-200 bar). · Hardness 80±5 Shaw A: The pressure is usually around 20-35 MPa (200-350 bar). Hardness 90±5 Shaw A: The tolerable pressure is usually around 35-50 MPa (350-500 bar).

06 Fluorine silicone rubber (FVMQ) O-ring

When the hardness range of fluorine silicone rubber (FVMQ) O-ring is 45-80 Shore A, its use pressure value will increase with the increase of hardness. Fluorine silicone rubber combines the advantages of silicone rubber and fluorine rubber, has good high and low temperature resistance and chemical corrosion resistance, but its pressure resistance is usually not as good as other rubber materials, such as hydrogenated nitrile butadiene rubber (HNBR) or fluorine rubber (FKM). The following is A rough reference to the pressure range of different hardness fluoro-silicon O-rings: 

Hardness 45±5 Shaw A: Suitable for low pressure applications, usually can withstand pressure of 1-5 MPa (10-50 bar). Hardness 55±5 Shaw A: The pressure is usually around 5-10 MPa (50-100 bar). Hardness 65±5 Shaw A: The tolerable pressure is usually around 10-15 MPa (100-150 bar). · Hardness 75±5 Shaw A: The pressure is usually 15-20 MPa (150-200 bar). · Hardness 80±5 Shaw A: The pressure can withstand is usually around 20-25 MPa (200-250 bar).

07 Tetrapropyl fluoro Rubber (AFLAS)

Tetrapropylfluorinated rubber (AFLAS), also known as perfluorinated rubber, is a high-performance material with extremely high chemical stability and high temperature resistance. When the hardness range of its O-ring is 60-90 Shore A, it can withstand the use of pressure is usually higher, and with the increase of hardness, its pressure resistance will also be improved. The following is A rough reference to the pressure range of the four propyl fluoride O-rings with different hardness: 

Hardness 60±5 Shaw A: Suitable for medium pressure applications, usually can withstand pressure of 10-15 MPa (100-150 bar). · Hardness 70±5 Shaw A: The tolerable pressure is usually around 15-20 MPa (150-200 bar). · Hardness 80±5 Shaw A: The tolerable pressure is usually around 20-30 MPa (200-300 bar). Hardness 90±5 Shaw A: The pressure is usually around 30-40 MPa (300-400 bar).

08 Perflurane O-ring (FFKM, Perflurane elastomer)

When the hardness range of perflurane rubber O-rings is 75-90 Shore A, its use pressure value is usually higher, and with the increase of hardness, the pressure resistance will be improved accordingly. Perflurane rubber is known for its excellent chemical and high temperature resistance and is suitable for use in extremely demanding environments. The following is A rough reference to the use pressure range of perflurane O-rings with different hardness: 

Hardness 75±5 Shore A: Suitable for medium and high pressure applications, usually can withstand pressure of 20-30 MPa (200-300 bar). Hardness 80±5 Shaw A: The pressure is usually around 30-35 MPa (300-350 bar). Hardness 90±5 Shaw A: The pressure is usually around 35-40 MPa (350-400 bar).