Its phenol formaldehyde resin used as cold setting bonding agent for foundry sand to steel and iron Properties:- 1.Appearance: Clear ( From yellow to dark red ) Liquid 2.Viscosity/ 20 C : (1.5-5) p 3.Nitrogen content : Non 4.Solid content : (70+2) % 5.PH : (4.8-5.8 ) 6.storage life : (6) months at a temp below 25 C at least Uses:- Mix 100 PBW clean and dry silica sand with PBW hardner (Para toluene sulphonic acid) for 2 min. and add 2PBW cold set resin for 3 min put the mixture in the clean mould and released after 30 min This gives the following bending strengths: