DIA SILVER 2

Design Guide 37 Hot spots Improper cooling Venting plugged Barrel too hot Too hot Melt temperature Reduced transfer position Check venting Add a flow leader Insure cushion position Insure proper screw recovery Add a foaming agent Increase hold pressure Reduce mold Increase mold Sink Root cause: Material is shrinking away from mold surface. 38 Gravi-Tech Condensation Wrong screw configuration Residence time too long Excessive decompression Check mold surface for condensation Check for condensation in feed throat Check dry material dew point Increase mold Reduce screw speed Reduce decompression Splay • Silver streaks on part Root cause: Material degradation Design Guide 39 Venting impaired Leaking check ring Heating band burned out Transfer position too high Clean mold surface Check vents Increase melt Increase mold Increase back pressure Decrease transfer Surface Finish Root cause: Material is not reproducing the mold surface finish. 40 Gravi-Tech Tooling damage Heater band overriding Leaking check ring Melt temperature Pack pressure too high Hold time too low Reduce gate size Increase cooling in gate area Check gate for blockage Check thermocouples for continuity Ensure cushion is maintained Dry material Reduce melt temperature Reduce tip temperature Gate Vestige Root cause: Material doesn’t have a clean break at gate.

Geon(TM) DB4961 SILVER PMS 7544 + FLAKE

16285TFX EPIC TFX SILVER GLITTER

OnForce™ Long Glass Fiber Reinforced Thermoplastics: developed for automotive foot pedals, providing high dimensional stability, rigidity and flexibility, cyclic fatigue strength, and long-term creep resistance as well as excellent chemical and UV resistance, shows good colorability (including silver) and ease of processing

SILVER MIST

Surface Defects Silver streaking or splay marks

Surface Defects Silver streaking or splay marks

Design Guide 37 Hot spots Improper cooling Venting plugged Barrel too hot Too hot Melt temperature Reduced transfer Check venting Add a flow leader Insure cushion position Insure proper screw recov- ery Add a foaming agent Increase hold pressure Reduce melt Reduce mold Increase mold Sink Root cause: Material is shrinking away from mold surface. 38 Gravi-Tech Condensation Wrong screw configuration Injection speed too fast Residence time too long Excessive Check mold surface for condensation Check for condensation in feed throat Check dry material dew point Increase mold Reduce melt Reduce screw speed Reduce decompression Splay • Silver streaks on part Root cause: Material degradation Design Guide 39 Venting impaired Leaking check ring Heating band burned out Melt temperature Transfer position too high Clean mold surface Check vents Increase melt Increase mold Increase back pressure Decrease transfer Surface Finish Root cause: Material is not reproducing the mold surface finish. 40 Gravi-Tech Tooling damage Heater band overriding Leaking check ring Melt temperature Pack pressure too high Hold time too low Reduce gate size Increase cooling in gate area Check gate for blockage Check thermocouples for continuity Ensure cushion is maintained Dry material Reduce melt Reduce tip temperature Gate Vestige Root cause: Material doesn’t have a clean break at gate.

Metallic fibers that create electrical conductivity include copper, silver and stainless steel. When molding an electrically conductive compound, create a silver or fibrous surface, not a resin-rich surface, and use a low extruder barrel temperature.1 For electrically nonconductive but thermally conductive compounds, raise the barrel temperature.2