Sealing Design Guide Rogers Corp（罗杰斯公司密封设计指南）.pdfVIP

Sealing Design Guide ® ® PORON Urethane | BISCO Silicone Materials Sealing Design Guide SUCCESSFUL ENCLOSURES RELY ON ALL ASPECTS OF THE DESIGN TO MAKE AN EFFECTIVE SEAL. This guide presents comparison test data on sealing materials while highlighting essential criteria for long-term sealing solutions in many enclosure applications. The accompanying research acts as a reference for material selection, while serving to better educate the market on Rogers’ materials. ENCLOSURE STANDARDS Seals are used in industrial, electrical, and electronic applications to keep in what’s meant to be in and keep out what’s meant to be out. Four types of gaskets – strip, die-cut, form-in-place and bulb extrusion – help to seal according to the requirements of four of the most common standards: p National Electrical Manufacturer’s Association (NEMA)*: Ratings are numbered. Most common for indoor applications are 12 and 13, while 3, 4, 4x, 6 and 6P are most common for outdoor applications. p Underwriters Laboratories® (UL): Ratings are similar to NEMA. p International Electrotechnical Commission (IEC): IP-XX (ingress protection) codes specify protection required. p Canadian Standards Association (CSA) *Note: NEMA only provides guidelines, not certification Multiple factors, including enclosure and gasket design, contribute to successful sealing, but material selection is also critical. If the gasket leaks or must be replaced, enclosure certification can be lost, resulting in lost time and increased expenses, in addition to the damage incurred to the components within. Materials Specifications MATERIAL SPECIFICATIONS Many engineers prefer to use gasketing materials like PORON® Urethanes and BISCO® Silicones that are already certified for use under several standards, including UL-508 (industrial control eq