Plastic Material: Shrinkage Rate

To ensure the mold is built to best fit your needs, material used for injection molding is one of the most important elements to create a perfect mold design, the mold cavity shape and dimension can be calculated by the size of finished products and material shrinkage rate. 

Below is a list of plastic material shrinkage rate by percent, the information are only for references use, the rates may differ due to humidity, temperature, brands of plastic material, or many other reasons, for exact shrinkage rate, please check material data sheet with your material supplier:

Plastic Material Abbrev. Shrinkage Rate(%)
Acrylonitrile Butadiene Styrene ABS 0.6~1.6
Acrylonitrile-Butadiene Styrene High Heat ABS HIGH HEAT 0.4~0.9
Acrylonitrile-Butadiene Styrene High Impact ABS HIGH IMPACT 0.4~0.9
Acrylonitrile-Butadiene Styrene Flame Retardant ABS FR 0.3~0.8
Acrylonitrile Butadiene Styrene/Polycarbonate ABS/PC 0.5~0.7
Acrylonitrile Butadiene Styrene/Polycarbonate 205 Glass Fiber ABS/PC 20% GF 0.2~0.3
Acrylonitrile-Butadiene Styrene/Polycarbonate Flame Retardant ABS/PC FR 0.3~0.6
Amorphous Thermoplastic Polyimide Blend, Ultra-high heat, Chemical Resistant (High Flow) TPI 0.8~1.0
Amorphous Thermoplastic Polyimide Blend, Ultra-high heat, Chemical Resistant (Standard Flow) TPI 0.8~1.0
Amorphous Thermoplastic Polyimide, High Heat, Transparent, Lead-Free Solderable (High Flow) TPI 1.0~1.2
Amorphous Thermoplastic Polyimide, High Heat, Transparent, Lead-Free Solderable (Standard Flow) TPI 1.0~1.2
Amorphous Thermoplastic Polyimide, Moderate Heat, Transparent TPI 0.5~0.7
Amorphous Thermoplastic Polyimide, Moderate Heat, Transparent (Food Contact Approved) TPI 0.5~0.7
Amorphous Thermoplastic Polyimide, Moderate Heat, Transparent (Mold Release Grade) TPI 0.5~0.7
Amorphous Thermoplastic Polyimide, Moderate Heat, Transparent (Powder Form) TPI 0.5~0.7
Acrylonitrile Styrene Acrylate ASA 0.4~0.7
Acrylonitrile Styrene Acrylate/Polycarbonate ASA/PC 0.3~0.7
Acrylonitrile Styrene Acrylate/Polycarbonate Flame Retardant ASA/PC FR 0.4~0.8
Acrylonitrile Styrene Acrylate/Polyvinyl Chloride ASA/PVC 0.3~0.7
Cellulose Acetate CA 0.3~1.0
Cellulose Acetate Butyrate CAB 0.2~0.9
Cellulose Diacetate-Pearlescent Films - 1.0~1.5
Cellulose Diacetate-Matt Film - 1.0~1.5
Carboxymethyl Cellulose CMC 0.1~0.3
Cellulose Propionate CP 0.1~0.9
Chlorinated Polyvinyl Chloride CPVC 0.3~0.7
Polyepoxide Epoxy 0.1~0.5
Ethylene Tetrafluoroethylene ETFE 3.0~4.0
Ethylene Vinyl Acetate EVA 0.4~3.5
Fluorinated Ethylene Propylene FEP 3.0~6.0
High Density Polyethylene HDPE 1.5~4.0
High Density Polyethylene 30% Glass Fiber HDPE 30% GF 0.4
High Impact Polystyrene HIPS 0.2~0.8
High Impact Polystyrene Flame Retardant V0 HIPS FR V0 0.3~0.6
Liquid Crystal Polymer LCP 0.1~0.6
Liquid Crystal Polymer Carbon Fiber LCP CF 0.1~0.5
Liquid Crystal Polymer Glass Fiber LCP GF 0.1~0.4
Liquid Crystal Polymer Mineral LCP MINERAL 0.1~0.5
Low Density Polyethylene LDPE 2.0~4.0
Low Density Polyethylene 30% Glass Fiber LDPE 30% GF 0.5
Linear Low Density Polyethylene LLDPE 2.0~2.5
Transparent Acrylonitrile Butadiene Styrene MABS 0.4~0.7
Melamine resin MF 0.5~1.5
Polyamide 6 PA6/NY6 0.5~1.5
Polyamide 6-6 PA66/NY66 0.7~3.0
Polyamide 6-6 30% Glass Fiber PA66/NY66 30% GF 0.5~0.5
Polyamide 6-6 30% Mineral Filled PA66/NY66 30% MINERAL FILLED 0.6~1.0
Polyamide 6-6 Impact Modified PA66/NY66 IM 1.2~3.0
Polyamide 6-6 Impact Modified 15-30% Glass Fiber PA66/NY66 IM 15-30% GF 0.2~0.6
Polyamide 66 Carbon Fiber, Long, 30 % Filler by Weight PA66/NY66 30% CF 0.3~0.3
Polyamide 66 Carbon Fiber, Long, 40 % Filler by Weight PA66/NY66 40% CF 0.3~0.3
Polyamide 66 Glass Fiber, Long, 50 % Filler by Weight PA66/NY66 50% GF 0.3~0.3
Polyamide 66 Glass Fiber, Long, 60 % Filler by Weight PA66/NY66 60% GF 0.3~0.3
Polyamide 6-10 PA6-10/NY6-10 1.0~1.3
Polyamide 11 30% Glass Fiber PA11/NY11 30% GF 0.5~0.5
Polyamide 11 Conductive PA11/NY11 CONDUCTIVE 0.7~2.0
Polyamide 11 Flexible PA11/NY11 FLEXIBLE 1.4~1.8
Polyamide 11 Rigid PA11/NY11 RIGID 0.7~2.0
Polyamide 12 Conductive PA12/NY12 CONDUCTIVE 0.7~2.0
Polyamide 12 Fiber Reinforced PA12/NY12 FIBER REINFORCED 0.7~2.0
Polyamide 12 Flexible PA12/NY12 FLEXIBLE 0.7~2.0
Polyamide 12 Glass Filled PA12/NY12 GLASS FILLED 0.7~2.0
Polyamide 12 Rigid PA12/NY12 RIGID 0.7~2.0
Polyamide 46 PA46/NY46 1.5~2.0
Polyamide 46 30% Glass Fiber PA46 30% GF/NY46 0.3~1.3
Polyamide Imide PAI 0.6~1.0
Polyamide Imide 30% Glass Fiber PAI 30% GF 0.1~0.3
Polyamide Imide Low Friction PAI LOW FRICTION 0.1~0.5
Polyacrylonitrile PAN 0.2~0.5
Polyarylate PAR 0.9~1.2
Polyarylamide 30-60% Glass Fiber PARA 30%~60% GF 0.1~0.4
Polybutylene Terephthalate PBT 0.5~2.2
Polybutylene Terephthalate 30% glass fiber PBT 30% GF 0.2~1.0
Polycarbonate PC 0.6~0.8
Polycarbonate 20-40% Glass Fiber PC 20-40% GF 0.1~0.5
Polycarbonate 20-40% Glass Fiber Fire Retardant PC 20-40% GF FR 0.1~0.5
Polycarbonate High Heat PC HIGH HEAT 0.7~1.0
Polycarbonate/Polybutylene Terephthalate PC/PBT 0.6~1.1
Polymonochlorotrifluoroethylene PCTFE 0.5~1.5
Polyethylene PE 0.5~2.5
Polyethylene 30% Glass Fiber PE 30$ GF 0.2~0.6
Polyether Ether Ketone PEEK 1.2~1.5
Polyether Ether Ketone 30% Glass Fiber Reinforced PEEK 30% GF REINFORCED 0.4~0.8
Polyether Ether Ketone 30% Carbon Fiber Reinforced PEEK 30% CF 0.0~0.5
Polyetherimide PEI 0.7~0.8
Polyetherimide 30% Glass Fiber PEI 30% GF 0.2~0.4
Polyetherimide Mineral Filled PEI MINERAL FILLED 0.5~0.7
Polyetherketoneketone- Low Crystallinity Grade PEKK LOW CRYSTALLINITY GRADE 0.004~0.005
Polyethersulfone PES 0.6~0.7
Polyethersulfone 10~30% Glass Fiber PES 10~30% GF 0.2~0.3
Polyethylene Terephtalate PET 0.2~3.0
Polyethylene Terephtalate 30% Glass Fiber PET 30% GF 0.2~1.0
Polyethylene Terephtalate 30/35% Glass Fiber Impact Modified PET 30%/35% GF IM 0.2~0.9
Polyethylene Terephtalate Glycol PET G 0.2~1.0
Polyethylene-Ultra High Molecular Weight PE-UHMW 4.0~4.0
Phenolic Resins PF 0.4~0.9
Perfluoroalkoxy PFA 3.0~5.0
Polyhydroxybutyrate PHB 1.2~1.6
Polyimide PI 0.2~1.2
Polylactide-Injection Molding PLA 0.3~0.5
Polymethylmethacrylate(Acrylic) PMMA 0.2~0.8
Polymethylmethacrylate(Acrylic) High Heat PMMA HIGH HEAT 0.2~0.8
Polymethylmethacrylate(Acrylic) Impact Modified PMMA IM 0.2~0.8
Polymethylpentene PMP 1.6~2.1
Polymethylpentene 30% Glass Fiber PMP 30% GF 0.3~1.2
Polymethylpentene Mineral Filled Impact Modified PMP MINERAL FILLED IM 1.4~1.7
Polyoxymethylene(Acetal) POM 1.8~2.3
Polyoxymethylene(Acetal) Low Friction POM LOW FRICTION 1.8~3.0
Polyoxymethylene(Acetal) Impact Modified POM IMPACT MODIFIED 1.0~2.5
Polyoxymethylene(Acetal) Mineral Filled POM MINERAL FILLED 1.0~2.5
Polypropylene PP 1.0~2.5
Polypropylene Impact Modified PP IM 2.0~3.0
Polypropylene 10-20% Glass Fiber PP 10~20% GF 1.0~2.5
Polypropylene 10-40% Mineral Filled PP 10~40% MINERAL FILLED 0.6~1.4
Polypropylene 10-40% Talc Filled PP 10~40% TALC FILLED 0.9~1.4
Polypropylene 30-40% Glass Fiber Reinforced PP 30~40% GF REINFORCED 0.1~1.0
Polypropylene Homopolymer PP Homopolymer 1.0~3.0
Polypropylene Copolymer PP Copolymer 2.0~3.0
PP Homopolymer, Long 30% Glass Fiber, Filler by Weight PP Homopolymer 30% GF 0.4~0.4
PP Homopolymer, Long 40% Glass Fiber, Filler by Weight PP Homopolymer 40% GF 0.3~0.3
PP Homopolymer, Long 50% Glass Fiber, Filler by Weight PP Homopolymer 50% GF 0.3~0.3
Polypropylene 10-40% Mineral Filled PP 10~40% MINERAL FILLED 0.6~1.4
Polyphthalamide PPA 1.5~2.2
Polyphthalamide 30% Mineral PPA 30% MINERAL 1.0~1.2
Polyphthalamide 33% Glass Fiber Reinforced PPA 33% GF REINFORCED 0.5~0.7
Polyphthalamide 33% Glass Fiber Reinforced (High Flow) PPA 33% GF REINFORCED 0.74~0.76
Polyphthalamide 45% Glass Fiber Reinforced PPA 45% GF REINFORCED 0.1~0.3
Polyphenylene Ether PPE 0.5~0.8
Polyphenylene Ether Flame Retardant PPE FR 0.6~1.0
Polyphenylene Ether Impact Modified PPE IM 0.6~1.0
Polyphenylene Ether 30% Glass Fiber Reinforced PPE 30% GF REINFOCED 0.1~0.4
Polyphenylene Ether Mineral Filled PPE MINERAL FILLED 0.3~0.7
Polyphenylene Oxide PPO 0.6
Polyphenylene Oxide 30% Glass Fiber PPO 30% GF 0.1
Polyphenylene Sulfide PPS 0.6~1.4
Polyphenylene Sulfide 20-30% Glass Fiber PPS 20-30% GF 0.2~0.5
Polyphenylene Sulfide 40% Glass Fiber PPS 40% GF 0.2~0.5
Polyphenylene Sulfide Conductive PPS CONDUCTIVE 0.3~1.0
Polyphenylene Sulfide Glass Fiber & Mineral PPS GF & MINERAL 0.3~0.7
Polyphenylene Sulfone PPSU 0.7~0.7
Polystyrene PS 0.3~0.6
Polystyrene 30% Glass Fiber PS 30% GF 0.2~0.2
Polystyrene Crystal PS CRYSTAL 0.1~0.7
Polystyrene High Heat PS HIGH HEAT 0.2~0.7
Polysulfone PSU 0.7~0.7
Polysulfone 30% Glass Fiber PSU 30% GF 0.1~0.6
Polysulfone Mineral Filled PSU MINERAL FILLED 0.4~0.5
Polytetrafluoroethylene PTFE 3.0~6.0
Polytetrafluoroethylene 25% Glass Fiber PTFE 25% GF 1.8~2.0
Polyurethane PU 0.6~0.8
Polyvinyl Chloride-Plasticized PVC-PLASTICIZED 0.2~4.0
Polyvinyl Chloride-Plasticized Filled PVC-PLASTICIZED FILLED 0.8~5.0
Polyvinyl Chloride-Rigid PVC RIGID 0.1~0.6
Polyvinyl Chloride 20% GF Reinforced PVC 20% GF REINFORCED 0.1~0.2
Polyvinylidene Chloride PVDC 0.5~2.5
Polyvinylidene Fluoride PVDF 0.5~2.5
Styrene Acrylonitrile SAN 0.3~0.7
Styrene Acrylonitrile 20% Glass Fiber SAN 20% GF 0.1~0.3
Polysiloxanes/Silicone SI 0.5~2.5
Styrene Maleic Anhydride SMA 0.4~0.8
Styrene Maleic Anhydride 20% Glass Fiber SMA 20% GF 0.2~0.3
Styrene Maleic Anhydride Flame Retardant V0 SMA FR V0 0.5~0.5
Thermoplastic Elastomer TPE 2.5
Thermoplastic Starch Injection General Purpose TPS GP 0.6~1.5
Thermoplastic Starch Injection Water Resistant TPS WR 0.6~0.9
Urea-Formaldehyde Resin UF 0.6~1.4
Crosslinked Polyethylene XLPE 0.7~5.0