Sikaflex-1a is a premium-grade,high-performance,moisture-cured,1-component,polyurethane-based,non-sag elastomeric sealant. Meets Federal specification TT-S-00230C, Type II, Class A. Meets ASTM C-920, Type S, Grade NS, Class 35, use T, NT, O, M, G, I, A; Canadian standard CAN/CGSB 19.13-M87. 2-Pack