Guide To Suppliers

The Gerromatic radial shaft seal from Freudenberg Sealing Technologies comprises a stainless-steel retaining element and a high-performance PTFE wave-shaped sealing lip that runs in a novel sinusoidal pattern on the shaft surface.

Based on a proprietary and patented crosslinking system that has been developed specifically for the chemical processing industry, DuPont Kalrez Spectrum 7275 seals exhibit minimal swelling and improved retention of physical properties when exposed to aggressive chemicals.

The DuPont Kalrez LS390 series of perfluoroelastomer sanitary seals have been designed specifically for use in sectors that include life science, food and beverage, and pharmaceutical.

The deformation of metal O-ring seals can occur where process operating conditions reach temperatures up to 300°C, with liquid pressures also as high as 100 bar. This form of seal failure can result in leaks, causing safety concerns while also necessitating clean-up operations and the interruption or total suspension of production line activities.

Two of the latest speciality types of DuPont Viton fluoroelastomers (FKM) sealing products, made with APA (Advanced Polymer Architecture), are available in the UK from Dichtomatik.

Wherever aggressive biodiesel and alcohol additives are utilised in motor fuels, it poses particular problems associated with unstable chemistry for any of the companies involved in production, blending, transportation and dispensing of such fuels.

Pharmaceutical and food process lines which are required to operate at the highest hygiene levels, utilise pure, high temperature aggressive water (WFI) systems for their SIP (Steam in Place) and CIP (Clean in Place) processes. The operation of repeated steam recycling, however, places severe demands upon any sealing products incorporated within control valves utilised in the process pipework.

Chemically resistant Kalrez O-ring seals from Dichtomatik are rated for operation at temperatures down to -42°C. These products are the latest in the DuPont Kalrez Spectrum perfluoroelastomer range, which has proven capability with over 1,800 chemicals, solvents and aggressive fluids, combining excellent sealing performance and elasticity at such low temperatures. The seals are a suitable replacement for less chemically resistant elastomers such as silicone or fluoroelastomers.