k-flex Sealing system: Uniquely durable

Seals must ensure trouble-free operation of the valves and connections at high loads. Guth valves and components also benefit from the k-flex seals  developed by KIESELMANN.

This material has a very high resistance even with aggressive media. Even higher temperatures, which are frequently used in CIP cleaning, cannot affect the material. When it comes to production safety and long maintenance intervals, it is clearly superior to conventional sealing materials.

Only Guth and KIESELMANN offer valves and components with these particularly robust and durable k-flex sealing elements. In conjunction with the aseptic retrofit kit, even conventional DIN 11851 fittings can be inexpensively and quickly converted into a sterile pipe connection - longevity included.


• Low sealing pressure required

• High resistance to temperature and aggressive media

• FDA compliant

• Due to excellent cleanability (anti-adhesive), suitable for aseptic use

• Considerably longer service life, resulting in longer maintenance intervals (lower costs due to production downtime)

• Very good resilience

• Uniform distribution of pressure on the seal circumference

Field of application of sealing materials


Application area

Max Temp. long-term | short-term

Silicone rubber peroxide crosslinked, grey

Hot water mineral oil

+100° C | +120° C +120° C | +150° C - 40° C | - 50° C

Fluo-rubber carbon-black filled, black (FKM)

Hot water mineral oil

+90° C | +110° C +165° C | +190° C - 10° C | - 15° C

EPDM, peroxide-crosslinked, black (with incorporated lubricant)

Air, dry hot steam

+120° C | +145° C +145° C | +170° C - 35° C | - 40° C

HNBR peroxide-crosslinked, dark grey

Hot water mineral oil

+130° C | +150° C +150° C | +170° C - 15° C | - 20° C