PTSA is comparable in strength to mineral acids such as Sulphuric acid, but are especially suitable for organic reactions where an inorganic, mineral acid could cause charring, oxidation, or an unwanted chemical reaction. It is most useful as acid-catalyst reaction such as esterification condensation acetylation polymerization alkylation’s hydrolysis dehydration. It is also used as curing agent for many thermosetting resin system such as varnishes minophenolicfoundry resinacrylic resinsresoles epoxies amino-Plastics and furniture lacquers.