... weight, used as dispersion additives in granulation. TPI-II: Mooney viscosity 20~40, good machining performance, used in medical ... products and used as shape memory materials. TPI-IV: Mooney viscosity 60~80, good dynamic performance, acceptable machining performance, ... used in tyres and shock absorption products. TPI-V: Mooney viscosity 80~100, good dynamic performance, difficult machining, used ...