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Abbreviations for Various Plastic Materials Typical Molding Problems and Possible Causes

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