The elastomer named, not "rubber"
NBR, FKM, EPDM, silicone and PTFE suit different fluids and temperatures. We get the compound named and matched to what the seal actually sits in.
What we can help you buy on 1688
Seals and gaskets
Last updated
A seal is defined by three things: the compound, the hardness, and the dimensions. Listings usually give the third and call the first "rubber".
That matters because NBR, FKM, EPDM and silicone fail in completely different conditions, and a seal in the wrong compound fails quickly rather than immediately.
Request a quote for seals and gaskets
What we check before you pay
Hardness in Shore A
Hardness decides whether a seal extrudes under pressure or fails to seal at all. It is a number the factory has and rarely publishes.
Temperature and chemical compatibility
A compound rated for the temperature but not for the fluid degrades quietly. Both need checking against the application, not just one.
Measuring a used seal correctly
A seal that has been in service is swollen or compressed. We work from the housing dimensions where possible, and adjust for wear when only the old part is available.
Cross-section, not just diameter
An O-ring is inside diameter and cross-section. Getting the cross-section wrong by half a millimetre produces a part that fits the groove and does not seal.
Moulding quality and flash
Parting line flash, voids and under-cure are what separate a cheap seal from a working one. All three are visible under inspection.
How an order runs
- Send the seal or the housing dimensions A part number, a photograph with a calliper in frame, or the housing measurements. Housing dimensions beat a worn seal.
- Compound and hardness established We match the elastomer and hardness to the application and confirm both with the seller in writing.
- Dimensions confirmed Inside diameter, cross-section and any lip geometry checked against your reference, with wear accounted for.
- Quote and approval Goods, any tooling for a non-standard size, our service fee, inspection and freight, itemised.
- Inspection with parts measured Sampled seals measured and checked for flash, voids and cure, and photographed.
- Consolidate and ship Seals are small and light; they usually travel with the rest of your order rather than alone.