Kroll & Ziller Gaskets

The Kroll & Ziller GST range of gasket are metal re-inforced profiled rubber gaskets designed primarily for water quality pipework & therefore manufactured to the highest quality standards. International water quality standards are some of the most stringent worldwide & as such the GST range of gasket materials meet the main certication requirements such as:

The GST rubber steel gasket is widely used for low stress flange applications such as plastic & Glass Reinforced Epoxy (GRE) flanges. The novel O-ring profile on the inner diameter reduces the seal surface area & therefore drastically reduces bolt torque requirements, making it ideal for low stress flange applications. The range of materials has been thoroughly tested by the major institutions for compatibility with drinking water & foodstuffs. Temperatures from -30°C (NR) up to 200°C (FPM-S) are achievable with the correct rubber selection.


Spiral Wound Gaskets are suitable for a wide range of operating conditions and can be adapted to suit almost all applications. The gaskets can seal fluid pressures up to 250 bar and temperature range of -200°C to in excess of 450°C.

All RS and RSI gaskets for standard flanges have a 4.5mm thick sealing section of windings and filler material, with 3.2mm thick solid metal guide rings.


The standard gasket choice for RF and FF flanges, with the guide ring and sealing element made to ASME B16.20/DIN standards.


Type-2 comes with an extra inner ring fitted, providing an additional compression stop that protects the sealing element from heat and corrosion. Inner rings are standard on all gaskets NPS24" class 900#, NPS12" and above in 1500#, and NPS4" and above in 2500#. All spiral wound gaskets with PTFE filler material have inner rings fitted.


Type-3 gaskets are a sealing element only with a few additional layers of winding strip for use in tongue and groove and male/ female flanges. These gaskets are also available in oval, obround and diamond shape for valve bonnet and handhole applications.


Our Elastomers can be die or waterjet cut to customer specifications. Elastomers insulate and do not deform once compressed, Gaskets' elastomers are available in 1.5mm, 3mm, 5mm and 10mm thickness and can be made thicker on request. A standard roll is 1.2m x 10m with larger available on request. The hardness is 65 shore A + -5 average. Cotton fabric inserts are available on request.

Neoprene (CR )

Good oil and petroleum resistance.940° C / 17 bar.

Nitrile (NBR; Buna-n)

Good resistance to oil, solvents and fuels. 94° C / 17 bar.

Ethylene propylene Diene Monomer (EPDM)

Good resistance to ozone, sunlight, acids, alkalis and ketones. Not suitable for fuels and oils. 120° C / 17 bar.

Fluoroelastomer (FKM)

Excellent resistance to heat and oil combinations and a wide range of concentrated acids and chemicals. 205° C / 17 bar.

Styrene butadiene (SBR; Buna-S)

Good abrasion and impact resistance - general purpose sheet. Not suitable for oils, fuels and solvents. 940° C / 10 bar.