Future trends methods of improving membrane properties

11 Future trends methods of improving membrane properties 

A high bending resistance is already required for making up, handling, transporting and setting up and is indispensable for a long life-span of 

33 PTFE-coated samples (a) before soiling, (b) after soiling, and (c) after cleaning. 

The top-coats are responsible for the durability and resistance to water and chemical impacts from the environment. Mainly acrylic and fluori-nated polymers are used for top-coats on various base coats (PVC, PUR, PTFE, silicone rubber, etc.) to enhance resistance to soiling and ageing. Certain additives for UV protection can be added. Due to its self-cleaning non-adhesive surface the top-coat is often hard and brittle. On PVC coatings the top-coat gives not only protection against environmental influences but also a barrier against emission of plasticizer out of the PVC. 

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