GUARDIAN 900 SL is a high performance self-leveling one-part, cold applied, moisture curing, 100% silicone sealant that cures to a low durometer. It has ultra-high elongation and remains very durable. It has good flexibility and a low modulus, so it will maintain its integrity on joints with movement.
GUARDIAN 900 SL exhibits excellent unprimed adhesion to concrete, steel and most other construction substrates, provided they are clean, dry and free of dust and frost. It is unaffected by sunlight (ultra-violet rays), ozone, temperature extremes, rain and snow. It has a long service life, under normal conditions it will maintain its physical properties between -60°C to 200°C (-76°F to 392°F).