The unsaturation in the side chain can be the basis for addition polymerization using free radicals or ionic initiators. ![]() The presence of aliphatic side chains gives these resins increased hydrophobicity, which is a valuable property for many end-uses. CNSL can be polymerized by a variety of techniques. Polymerization is the most important reaction of CNSL from the point of its applications. It can replace phenol in many applications with equivalent or better results. It is a cheap and renewable substance and can be employed for the manufacture of a multitude of useful products. It is a naturally occurring substituted phenol which can take part in a variety of reactions. Massive literature is available on applications of cashew nut shell liquid.Ĭashew nut shell liquid (CNSL) is a by-product of the cashew industry. CNSL by itself is useful for insecticidal, fungicidal, and medicinal applications, and as an additive, in many plastic formulations. CNSL is used for the treatment of acne vulgaris. It is used traditionally as a cure for fungal attack of the feet in Kerala. It is used as a raw material to produce other derivatives which in turn have many different applications.ĬNSL is used in tropical folk medicine and for anti-termite treatment of timber. TABLE 2: CNSL SPECIFICATIONS OF AFRICAN COUNTRY CHARACTERISTICSĬashew nut shell liquid (CNSL) has a wide range of useful applications. Slightly different CNSL specifications are used in another country (in Africa), as shown in the following table. Viscosity after acid washing at 30 deg.TABLE 1: INDIAN STANDARD SPECIFICATIONS FOR CNSL CHARACTERISTICS The following table lists Indian Standard Specifications for CNSL. The characteristics of this treated CNSL are different from the original, i.e., raw CNSL. CNSL produced by using cold press solvent extraction method needs to be treated to remove metallic impurities as well as traces of sulphur compounds. ![]() The present article discusses specifications and applications of cashew nut shell liquid (CNSL).Ĭharacteristics of cashew nut shell liquid (CNSL) obtained from different manufacturing processes vary to some extent.
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