Sikasil® WS-305 AM is a neutral curing silicone sealant with high movement capability and excellent adhesion to a wide range of substrates. It is particularly suited as a weather seal for curtain walls and windows. Sikasil® WS-305 AM is typically used for weathersealing curtain walls and glass butt joints or as a perimeter weather seal for windows, doors, and window walls.
Meets the requirements of ASTM C920 Type S, Grade NS, Class 50, Use NT, M,G,A
Meets the requirements of ASTM C1184, Type S, Use G,A
Meets the requirements of AAMA 803.3 and 808.3
ASTM E84 with a Flame Spread Index of 15 (Class A acc. to IBC)
Los Angeles Research Report (LARR) approved
Good UV and weathering resistance
Adheres well to many substrates including concrete, glass, metals, coated and painted metals, vinyl, and wood.
