← Back to Basic Seal

O-ring

O-ring product photo

O-rings are used in a wide range of static and dynamic applications, and are the most widely used seal in terms of efficiency and cost.

O-ring ID / CS dimension diagram
O-ring dimensions — Inside Diameter (ID) / Cross Section (CS)

Standards

AS568 (American Standard)G, P, S, V (Japanese Industrial Standard) Metric SizesCustom Spec (Spliced O-rings)

Materials

MaterialApplicationTemp. Range
NBR (Nitrile-butadiene)Oil resistance, abrasion resistance, hydraulic-35~100°C
HNBR (Hydrogenated NBR)Cold resistance, new refrigerants-35~130°C
FKM (Fluorocarbon) = Viton®(Dupont)Heat & chemical resistance-25~230°C
EPDM (Ethylene-Propylenediene)Water resistance, weathering, steam-45~130°C
VMQ (Silicone) & FVMQ (Fluorosilicone)Heat/cold resistance, food-grade-55~200°C
CR (Chloroprene) = Neoprene(Dupont)Excellent weathering & ozone/heat aging resistance-40~100°C
PU (Polyurethane)Abrasion resistance, high pressure-40~80°C
PA, ACM (Polyacrylate)Weathering & ozone resistance-15~150°C
PTFE = TeflonHeat/chemical resistance, solid O-ring-180~230°C
TFE/P, AflasChemical resistance, steam-40~250°C
FFKM (PerFluorocarbon) = Kalrez®(Dupont)Outstanding chemical & heat resistanceMax 330°C
AED grade HNBR, FKM, FFKM (-60°C)Custom to customer environment-

Certifications

AED (Anti-Explosive Decompression) — NORSOK M710, NACE TM0297/TM0187 Food-Grade O-rings (NSF, FDA)
NSF certification logo FDA certification logo KIWA certification logo