’TECHNICAL DATA» ’TECHNICAL DATA» ABBREVIATIONS FOR VARIOUS PLASTIC MATERIALS TYPICAL MOLDING PROBLEMS AND POSSIBLE CAUSES

I List of Abbreviations for Plastic Materials In alphabetical order Cause Condition Molding machine Mold Material Abbreviations Resins (1 ) Low material temperature ( 1 ) Small gate or runner (1) Low fluidity ABS Acrylonitrile–butadiene–styrene (2 ) Low injection pressure ( 2 ) Inadequate gate position (2) Low lubricity AS Styrene–acrylonitrile GSAN in ISO (3) Material feed shortage ( 3 ) Inadequate position of or no air vent CA Cellulose acetate Filling miss (4 ) Too small nozzle hole diameter ( 4 ) Low mold temperature CAB Cellulose acetate butyrate Cresol–formaldehyde (5 ) Cylinder nozzle clogging ( 5 ) Cold slag clogging in runner or gate CF Carboxymethyl celluloss CMC Cellulose nitrate CN Casein (1 ) Weak clamping force (1) Flaw or a foreign body on parting plane (1) Excessive fluidity CS Ethyl cellulose (2) High injection pressure (2) Wide project area to the machine Fin EC Epoxide; epoxy (3) Material overfeed (3) High mold temperature Ethylene vinylalcohol (4) High material temperature EP Liquid Crystal Polymer EVA Melamine–formaldehyde (1) Low injection pressure (1) High mold temperature (1) Material, too supple LCP Polyamide ( ) Slow injection ( ) ( ) G 2 2 Products thickness uneven 2 High contraction coefficient MF Poly butyrene terephthalate Also PBT Shrinkage (3) High material temperature (3) Small gate PA Polycarbonate cavity Polychlorotriflu oroethylene (4) Short pressure retaining (4) Cooling time shortage PBTP Poly diallyl phthalate GAlso PDA (5) Material feed shortage (5) Inadequate ejection PC Polyethylene PCTFE High density Polyethylene (1) Low material temperature (1) Small gate or runner (1) Rapid curring PDAP Medium density Polyethylene (2) Low injection pressure (2) Low mold temperature (2) Insufficient drying Low density Polyethylene Weld line PE (3) Slow injection (3) Inadequate gate position (3) Low lubricity Polyethylene terephthalate GAlso PET ( 4 ) Inadequate air vent HDPE Phenol–formaldehyde MDPE Polyimide (1) Nozzle clogging or small diameter (1) Inadequate air vent (1) Insufficient drying LDPE Polyisobutylene No good luster/ (2) Material feed shortage (2) Small gate or runner (2) High volatility PETP Polymethyl methacrylate haze (3) Insufficient measures for corrosion (3) A foreign body mixed PF Polyoxymethylene Polyformaldehyde Polypropylene (4) Excessive mold release agent PI Polyphenylene-oxide PIBPPS Polyphenylene-sulfide (1) Low material temperature (1) Low mold temperature (1) Low fluidity PMMA Polystyrene (2) Low injection pressure (2) Products thickness uneven (2) Low lubricity POM High impact proof Polystyrene Flow mark (3) Slow injection (3) Small gate or runner Polytetrafluoroethylene PP (4) Too small nozzle diameter (4) Small or no slag well Polyurethane PPO Polyvinyl acetate Polyvinyl alcohol (1) Fast injection (1) Inadequate air vent (1) Insufficient drying PS Polyvinyl butyral (2) Low injection pressure (2) Small gate or runner (2) High volatility ( HIPS Polyvinyl chloride Silver streak/ ( ) ( ) PTFE Polyvinyl chloride acetate bubble 3 Small injection capacity 3 Products thickness uneven Polyvinylindene chloride ( ) ( ) PUR 4 Short pressure retaining 4 Small or no slag well Polyvinyl fluoride (5) High material temperature PVAC Polyvinyl formal PVAL Styrene–butadiene (1) High material temperature (1) Inadequate position of or no air vent (1) Excessive lubricant Silicone Black streak/ PVB (2) Long stay inside cylinder (2) Small slag well (2) Insufficient drying Thermoplastic elastomer burned PVC (3) Flaw inside cylinder (3) Oil or something inside cavity Urea–formaldehyde PVCA Unsaturated polyester ( ) ( ) ( ) PVDC 1 High injection pressure 1 Dislocations of nozzle hole and 1 Insufficient lubricant I ( ) sprue hole ReferencePVF 2 Material overfeed Bad release of (2) High mold temperature PVFM sprue or Codes Meaning (3) Low sprue gradient SB products Fiber reinforced plastic (4) Undercut on or low gradient of cavity SI Glass fiber reinforced plastic TPE Boron fiber reinforced plastic UF Carbon fiber reinforced plastic (1) High injection pressure (1) No good ejection mechanism (1) Low fluidity UP Fiber reinforced thermoplastic Warpage/ (2) Long pressure retaining (2) High mold temperature (2) High contraction Glass fiber reinforced thermoplastic deformation (3) Insufficient annealing (3) Big gate coefficient ( ) Carbon fiber reinforced thermoplastic (4) Uneven cooling 3 Low material rigidity

FRP GRP BRP CRP FRTP GRTP CRTP