silicone – treated back paper.
Prevents premature swelling
Resist hydrostatic pressures of up to 70 metres of water column = 7 bar
Highly durable and s hows no detrimental effect in performance during wet/dry cycling (25 cycles @ 70m)
Will not dissolve in water and is non – polluting
Designed for use in reinforced structural concrete utilising two rows of reinforcing steel with a minimum thickness of 200mm , provi ding the Surestop BWB with no less than 75mm concrete cover to all sides. Refer PUDLO Concrete Standards & Best Practice installation manual