NC 96 CW_ARCHITECTURAL

A A B B A To be positioned as shown Distance from the edge of the glass: of glass length B To ensure glass stability 1 10 *: Setting blocks are not supplied by Metra. AWNING and CASEMENT ALL PERFORMANCE GRADES ALL SASHES ALL GLASS THICKNESS Setting Block * NC70037 NC70054 NC70112 NC70113 ALL SASHES The spacer material and setting blocks used in structural glazing must be fully compatible with the structural silicone. Most Silicone Suppliers use ASTM C 1087-00 (Standard Method for Determining Compatibility of Liquid-Applied Sealants with Accessories Used in Structurally Glazed Systems) to test the compatibility of various accessories (setting blocks, gaskets, etc.) with their silicone products. This testing only assesses the impact that these accessories may have on the performance of the silicone sealant and does not imply compatibility or performance of the other products used in the curtain wall or window systems (i.e., insulating glass, laminate interlayers, glass coatings, spacer bar materials, etc.) in the presence of the silicone sealant. Most silicone setting blocks, composed of 100% silicone, are found to be compatible for full contact with structural silicones. Other materials such as EPDM, neoprene, Santoprene®, Kraton®, SCR (Silicone Compatible Rubber) and other similar organic materials may cause discoloration of light-colored silicone sealants. For weatherseal and structural glazing applications, only dark- colored (black, charcoal, or bronze, NOT gray) silicone sealants will be recommended for contact with these organic extrusions. Where discoloration is severe, even dark-colored silicone sealants may not be approved for weatherseal applications, due to potential long-term adhesion loss. When using insulating glass, the IG manufacturer should be contacted for their specific recommendation of setting blocks to ensure compatibility with the IG unit components (spacer, PIB, glass coatings, etc.). Note: When applying a weatherseal over the silicone setting block, a 1/8" minimum sealant thickness is required. Min 3.3 [ 1 8 "] Glazings Setting blocks Minimum rev 2018/01 1 72EV003 NC 96 CW Setting blocks