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Four-Sided Structural Glazing Over OPACI-COAT-300®: The ASTM Data, the Approvals Path, and the Certification Program Behind It

ICD now approves OPACI-COAT-300® silicone spandrel coating for use in four-sided structural glazing (4SSG) — without the edge deletion (cutback) that has constrained design teams for decades. The basis is hard data: independent ASTM C1135 testing through two third-party laboratories averaged 152.15 psi tensile adhesion across all required test conditions — over three times the 50 psi industry minimum.