Choosing the right materials There is a wide choice of vacuum pad materials available on the market, however, Nitrile Rubber and Silicone cover the majority of applications. The most common materials are covered below, however, when in doubt please contact our Technical Office. NBR (Nitrile Rubber) Nitrile is the most commonly used material for vacuum pads, being an all purpose rubber with good resistance to oils and greases. The wear resistance is good. Silicone Silicone have very good high and low temperature resistance and does not leave marks on shiny/colourless surfaces. The wear resistance is medium. Other Materials Special vacuum pads can be moulded from other materials such as Viton (which has excellent chemical resistance but only a medium wear resistance) and Polyurethane (a relatively hard material with very good wear and chemical resistance). For further information please contact our Technical Office. Think about safety When designing a vacuum system always remember to build in a safety factor when sizing your pads, particularly in instances where the vacuum pad is mounted in the vertical position Safety short-list • Size vacuum pad using the appropriate safety factor • Choose a vacuum ejector with ample capacity • Do not use a bellows type pad for heavy loads • Install an in-line filter between vacuum pad and Ejector • Do not use Quick Release fittings between pad and Ejector • Where necessary, use a vacuum sensing switch to ensure an adequate level of suction holding force.