Perma constructions aids private ltd. Offers modern construction chemicals to cater to all critical applications in the civil engineering industry. Perma plast-ex manufactured by the company is a general purpose plasticiser for concrete. It is a product based upon lingo sulphonates. It is used in areas of congested enforcement where high workability is beneficial, in pre-cast concrete manufacture and in concrete brick and block manufacture. The salient features of perma plast-ex are,