From Graces Guide
of Chase Road, London, NW10 of Bracknell of Trafford Park Road, Manchester (1965) of 3 William Street, South Gosforth, Newcastle-upon-Tyne (1965) of Greenhills Road, Walkinstown, Dublin 12 - Expandite (Ireland) Ltd
1934 Private company formed as Expandite Products Ltd.
1946 Name changed.
1955 Company made public.
1961 Engaged in the manufacture of building mastics, hot poured sealing compounds, rubber and plastic extrusions, extruded sealing strips, liquid waterproofing compounds and mechanical appliances. 
1965 Expandite Mastic gun.