Custom Compounders Since 1973

Polifil® RP-HIPS

Polifil RP-HIPS

Reprocessed High Impact Polystyrene

Polifil® RP-High Impact Polystyrene (HIPS) combines the good stiffness properties of polystyrene, with enhanced impact properties gained by the addition of impact modifiers, usually butadiene rubber. An amorphous resin, HIPS has low post-molding shrinkage, good melt strength, and a wide melt processing window, making the resin ideal for many sheet and thermoforming applications. Injection molding applications include cutlery, appliance parts, and furniture components. Sheet extrusion applications include thermoformed plates, cups, and trays.

The property values listed in the PDF document(s) have been obtained using laboratory controlled test methods. They are offered without guarantee since conditions under which the product is used are beyond our control. Mold shrinkage is intended as a guide only, as specific shrinkage is affected by part design, mold design and molding conditions. Therefore, The Plastics Group disclaims any liability for loss or damage incurred in connection with the use of this product.

Reinforcement content (%) TPG WI -
Specific gravity D 792 1.05
Melt flow 200/5.0 (g/10 min) D 1238 3-8*
Water absorption, 24 hours (%) D 570 <0.1
Mold shrinkage - 1/8" specimen (in/in) D 955 0.005
Mechanical @ 73°F    
Tensile strength (psi) D 638 3,600
Elongation @ yield (%) D 638 5
Elongation @ break (%) D 638 20
Tensile modulus (kpsi) D 638 260
Flexural modulus, tangent (kpsi) D 790 310
Flexural strength (psi) D 790 7,200
Izod impact, notched (ft-lbs/in) D 256 2.0
Gardner impact, 1/2" tup (in-lbs) D 5420 60
Rockwell hardness (R-scale) D 785 92
Deflection temperature, 66psi (°F) D 648 195
Deflection temperature, 264psi (°F) D 648 170
* melt flow may be specified