... Trans-PolyIsoprene, TPI, White or light yellow particles Trans-PolyIsopreneQuality Indexes of Trans-l,4-PolyIsoprene, TPIAppearance: White or light yellow particles Trans ... : 20~100 (Different from each model) Models of Trans-l,4-PolyIsoprene, TPITPI-I: Mooney viscosity maximum 20 ... performance, used in tyres and shock absorption products. TPI-V: Mooney viscosity 80~100, good dynamic performance, ...