NC 96 CW_ARCHITECTURAL

AWNING and CASEMENT ALL PERFORMANCE GRADES ALL SASHES Glass Gasket Silicone Structural Sealant Dow Corning ® 993 Silicone Weatherproofing Sealant Dow Corning ® 895 Dow Corning ® 995 Dow Corning ® 791 Dow Corning ® 797 Dow Corning ® 756 SMS ALL GLASS THICKNESS Glass Spacer Insulating glass sealant Setting Block * STRUCTURAL SILICONE GLAZING: Silicone structural glazing utilizes a high-performance silicone sealant to attach glass, metal or other panel materials to a metal frame in lieu of gaskets and mechanical attachments. The windload stresses are transferred through the structural silicone sealant to the structure of the building. The structural silicone sealant must maintain its adhesive and cohesive properties in order to support the panels under windload. Only silicone sealants are suitable for use in structural glazing applications. Whenever a silicone sealant is used to structurally attach panels, a comprehensive quality control procedure must be established to ensure the smooth, efficient, trouble-free completion of the project. Specific quality control procedures must be followed on all structural glazing projects in order to obtain Manufacturer's Structural Warranty. Silicone structural seal must be performed by an authorized glasswork manufacturer. Structural Silicone Suppliers, as Dow Corning, Sika and others, provide a series of testing procedures that must be followed to ensure product quality and bonding efficiency during time. Adhesion testing under modified ASTM C794 standards must be performed before manufacturing, using profile samples including project finishings if not previously tested by Metra. Chemically incompatible glazing accessories (gaskets, spacers, setting blocks, etc.) can lead to sealant discoloration and/or loss of sealant adhesion to the substrate. To ensure a product's suitability, Silicone Sealant Manufacturers perform compatibility tests of job site representative accessory materials with its silicone sealants using ASTM Cl087. Silicone sealant would yellow when in contact with EPDM, neoprene, bitumen, asphalt and other organic based membranes, coatings and gaskets. Dark-colored sealants will typically mask the yellowing. Performing an ASTM C1087 compatibility test will confirm the degree of yellowing; testing may be performed by most Silicone Sealant Manufacturers upon request. Sealant Suppliers can accommodate special, non-standard testing requirements. Please consult your local Sealant Representative at the beginning of the project to determine whether the supplier is capable of such testing services. Mock-up Testing Curing Minimums for Structural Load Testing - The structural sealant must be fully cured and adhered to the substrates prior to running structural load testing. With one-part structural sealants, it is best to leave the weatherseal open until complete cure and adhesion occurs for “exterior applied” designs. Closing off the joint opening with a weatherseal immediately will drastically slow down the cure of the structural sealant if shot and applied from the exterior. Glazings Structural silicone glazing rev 2018/01 1 72EV001 NC 96 CW Glazings