Hawk White is a pipe jointing compound for all general work. It is suitable for Natural Gas, non-potable water (NB: for potable water use Water Hawk), steam, air (excluding medical lines), brine, alcohol and also L.P. Gas. Hawk White complies with BS EN 751-2 Class A when used in conjunction with an approved reinforcing fibre or, as a sealing material for metallic threaded joints in contact with 1st, 2nd and 3rd family gases to 5 bar and 70 degrees celsius and water up to 7 bar and 130 degrees celsius. It may be used alone on pipe diameters up to 25 mm and is used with reinforcement fibre on pipework over 25 mm. Note that no British Standard exists for testing jointing compounds on pipes in excess of 50 mm diameter.