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Custom-made Kalrez ® o-rings (FFKM)

Kalrez ® o-rings (FFKM) have the best chemical resistance and temperature resistance of all available o-rings in the market. Ridderflex manufactures these super o-rings custom-made for you by vulcanising compounds in a mould. If desired, we can supply Kalrez ® o-rings with a quality guarantee or certificate. For the oil and gas industry and the valve industry we offer the explosive decompression o-ring.

FFKM o-ring: properties

The FFKM o-ring is our absolute star in terms of resistance properties. The Viton ® o-ring also performs very well, but the FFKM o-ring has an even better chemical resistance and temperature resistance. The material is similar to the fluoroplastic PTFE. The advantage of a FFKM o-ring  compared to a PTFE ring is its elasticity. A PTFE ring can not be pulled over a groove in an axle. Because of it’s flexibility, a Kalrez ® o-ring can.

Kalrez ® rubber is a fluoropolymer with an exceptionally good chemical resistance. The mechanical properties remain intact at temperatures of more than 300 ºC. Kalrez ® o-rings are therefore often applied in (petro) chemical industry. Kalrez ® has the very best resistance to hydrocarbons, acids, alkalis and even oxidants.

Custom-made Kalrez ® o-rings

Ridderflex manufactures Kalrez ® o-rings (FFKM) by vulcanising compounds in a mould. We also supply the exclusive explosive decompression o-ring for gas and high pressure applications.

We supply Kalrez ® o-rings in any desired dimension. Are you curious about the possibilities? Please contact our sales department!

O-rings with a quality guarantee

We supply Kalrez ® o-rings with a quality guarantee. If desired, we can supply a certificate. We work closely with, amongst others, Precision Polymer Engineering (PPE). This UK-based company manufactures the most exclusive o-rings in high-quality grades. Would you like to know more about the different grades of o-rings we can offer? Please consult the o-rings materials overview of PPE.

Explosive decompression o-ring

In gas applications and high-pressure applications where pressure suddenly drops, the gas that has penetrated into the o-ring wants to go out. As a result, the ring tears apart. For these critical applications we have a solution: the explosive decompression o-ring. We would be happy to advise you on this. Please call +31 (0) 180 46 34 71 or mail to

Kalrez ® o-ring (FFKM)

ISO including co-engineering

Ridderflex complies with international quality management requirements. We are now also certified for co-engineering – our strength – . Read more


Any questions about products or make an enquiry? Simply call us or send us an e-mail. +31 (0) 180 46 34 71