PTFE Membrane
August 2007
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Schreiner ProTech introduced a new PTFE (polytetrafluoroethylene) membrane that is an air-permeable and waterproof material suited for the ventilation of equipment housings. The company developed the PTFE membrane to enhance the effectiveness of its self-adhesive and nonadhesive pressure compensation seals (PCS), allowing air molecules to pass through the PCS while restricting passage of water, oil, and dirt particles. PTFE is commonly known under the Teflon brand name and has evolved into a material ideal for installation by means of pressure-sensitive adhesives. The company’s PTFE membrane is said to be oil, dirt, and water resistant, critically improving the performance of its PCS labels. The PTFE-enhanced PCS labels have been successfully applied to various industrial applications within the consumer electronics and medical technology industries, and they protect electronic components by providing chemical and thermal resistance to extreme elements.

Pressure compensation seals are made from microporous-membrane material to ensure pressure equalization without allowing water or contaminants to pass through. The seals are designed to withstand extremes such as steam cleaning. A protective laminate is applied over the PCS to protect the sensitive membrane and give it long-lasting functionality. The PTFE product is IP66 and IP67 compliant, thus meeting all the requirements of DIN 40050. High-performance capabilities of the membranes are illustrated by their technical specifications: air permeability is >5 L/hr per square cm (1.32 gal/hr per 0.78 sq in.), and water resistance is >0.6 bar (8.7 psi). In addition, the membrane offers a high degree of oleophobicity (7–8) and a wide temperature tolerance range from –40°C to 160°C.

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