Fosroc Thioflex 600 Gun Grade is a three‑part polysulphide joint sealant intended for sealing construction joints. It is applied as a gun‑grade material and provides chemical resistance to dilute acids, dilute alkalis and petrol, making it suitable for environments where occasional spillage may occur. The sealant cures chemically, achieving full hardness within 28 days at 25 °C.
