Polymers (EVA, SIS, SBS, SEBS)

1. EVA Stabilization
2. SIS Stabilization
3. SBS/ SEBS/ SEPS stabilization

After exposure to temperatures up to 170-200°C, typical adhesive grade ethylene vinyl acetate (EVA) polymers (vinyl acetate content: 18-40%) undergo discoloration together with gel formation and a viscosity increase. During static aging at 170°C, the viscosity increase can be reduced by the use of relatively low levels of antioxidants such as Irganox® 1010 or Irganox® HP 2921. The same antioxidants also reduce gel formation after dynamic aging (Figure 1) and hinder color development. Figure 1: Gel Content of EVA After Compounding in a Sigma Blade Kneader at 170°C To get expert advice on EVA polymer stabilization, use TechDirect.