It is a versatile by product of the Cashew industry. The nut has a shell of about 1/8 inch thickness inside which is a soft honey comb structure containing a dark reddish brown viscous liquid. It is called CASHEW NUT SHELL LIQUID or CNSL which is the pericarp fluid of the Cashew Nut.
CNSL has innumerable applications, such as friction linings, paints, laminating resins, rubber compounding resins, cashew cements, polyurethane based polymers, surfactants, epoxy resins, foundry chemicals, and intermediates for chemical industry. CNSL is used for manufacturing of CNSL Resin, Cardanol, Cashew Friction Dust, Anti corrosive hiring (lining) chemicals, Acid resistant Paints,
varnishes, Enamels, etc.