O-Ring Technical Resources & Guides

Size charts, material guides, chemical compatibility, failure analysis and FAQs for engineers specifying O-Rings and sealing components.

Tool

Interactive configurator for AS568, Metric, ISO 3601, BS 4518, GB/T 3452.1 and JIS B2401 — select standard, CS and ID, get instant OD readout.

Compare operating temperature range and ASTM No.3 oil resistance across 18 elastomers — NBR, FKM, FFKM, EPDM, Silicone and more.

Which elastomer to use with diesel, brake fluid, ammonia, acids, hydraulic oil, steam and 40+ common fluids.

NBR vs FKM, EPDM vs NBR, when to use FFKM — a practical decision framework for elastomer selection.

Extrusion, compression set, chemical attack, spiral failure — how to diagnose a failed O-Ring and fix the root cause.

Imperial vs metric O-Ring standards explained — which to use for US, European and Indian drawings.

Material datasheets (NBR 70/90, FKM 75/90, HNBR, EPDM, FFKM, Silicone, AFLAS) and product catalogues — all PDF downloads.

Temperature range, chemical resistance and cost comparison — when to use NBR and when to switch to FKM.

The critical mis-specification that causes catastrophic failure — EPDM for water/steam, NBR for oil.

When standard FKM is not enough — the case for FFKM (Kalrez alternative) and the cost trade-off.

Gland design, compression, surface finish and compound selection — static and dynamic differ significantly.

Step-by-step fitting guide — groove inspection, lubrication, fitting without damage, first pressurisation.

How to measure ID, CS and OD with calipers — including tips for used or deformed O-Rings.