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.In Plasticizers industries mainly for DEP DOP DBP – As esterification catalyst .· It is also used as curing agent for many resin system such as minophenolicacrylic resinsresoles epoxies amino-Plastics and furniture lacquers.