Struktol Strukrez 220 Resin Struktol Tackifier >> Hydrocarbon resin Rubber - Elastomer (Chloroprene, Butyl …) STRUKTOL ® STRUKREZ 220 PROCESSING ADDITIVE A molecular assembled resin designed for unique qualities in polymer processing. STRUKTOL ® STRUKREZ 220 is an effective tackifier for rubber compounds. Green tack is improved with STRUKTOL ® STRUKREZ 220, while important physical properties also show directional im-provements. 4 - 10 phr Molecular assembled resin designed for unique qualities in polymer processing. Used as an effective tackifier for rubber compounds. Improves green tack and important physical properties. Use level: 4-10 phr.