SP-103 is a heat-reactive, alkylphenolic resin in solid form. SP-103 is soluble in aromatic and aliphatic hydrocarbons, esters, ketones and partially in higher alcohols. SP-103 is extensively employed in the preparation of general-purpose and heat-activating polychloroprene cements. It can also be used in formulating adhesives with NBR, SBR, natural and reclaimed rubbers SP-103 is completely compatible with polychloroprene and nitrile rubbers. It has a compatibility limit of approximately 25 parts by weight in combination with 100 parts by weight of SBR, natural, and reclaimed rubbers.