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The O-ring is a ring-shaped packing with a circular cross-section (O type) and it generally exhibits sealing functionality through stress generated by mounting it in a groove and moderately compressing it.


  • Because the volume of the mounting section is small, only a small space is required.
  • Easy installation and removal due to the simple shape.
  • Options available for nearly any use with the wide variety of material types.
  • Excellent sealing function even if pressure alternates between both sides.
  • Excellent cost performance compared to other packings.
  • With our abundant product stock, we can promise quick delivery.

Chart of O-Ring Rubber Characteristics for Usage Requirements

O-ring applications require rubber characteristics such as excellent elasticity, compression set, abrasion resistance, heat resistance, and durability without being affected by liquids or gases. However, since no material is ideal for all conditions, the most appropriate materials must be chosen according to the application. AIR WATER MACH has a large selection of O-ring types that can be used for a variety of purposes.

Types and characteristics of O-ring materials

JIS symbol or AIR WATER MACH material number Rubber type Feature
NBR-70-1 (1A) Nitrile rubber A general material for hydraulic and pneumatic applications with excellent oil resistance
NBR-90 (1B) Nitrile rubber Similar to 1A but with excellent pressure resistance
NBR-70-2 (2) Nitrile rubber Excellent gasoline resistance
EPDM-70 (3) Ethylene propylene rubber Excellent resistance to brake oil and animal and vegetable oils
VMQ-70 (4C) Silicone rubber Excellent heat and cold resistance for use over a wide temperature range
FKM-70 (4D) Fluororubber Excellent heat and oil resistance.
E7-512 Ethylene propylene rubber Excellent weather and water resistance.
C7-130 Chloroprene rubber Overall balanced physical properties
F7-925 Fluororubber Excellent chemical and steam resistance suitable for food-related applications
F7-305 Fluororubber Fluororubber with excellent cold resistance
F7-644 Fluororubber Excellent alkali resistance
H7-541 Hydrogenated nitrile rubber Better heat resistance than nitrile rubber
Q7-103 Fluorosilicone rubber Excellent cold and fuel oil resistance
PB-70 Perfluoroelastomer Chemical resistance similar to PTFE

General Rubber Properties and Applications

Please test on actual machine before use, as the resistance data in the charts mainly refer to the characteristics of the polymer. Actual resistance may differ depending on the compounding method. (Charts below open in a new window.)