Shrinkage of various plastics

Gaurav Goel October 17, 2020 Tags:

What is shrinkage - Contraction of Plastics Molded Part

The shrinkage of plastics signifies the volume contraction of polymers during the cooling step of the processing of polymers. This contraction is partly due to the difference of density of polymers from the melt state and the cooled, rigid state.

plastic material shrinkage
plastics shrinkage

Most of the plastic molded part shrinkage occurs in the mold while cooling in Injection Molding. A small amount of shrinkage occurs after ejection as the part continues to cool and after that the part may continue to shrink very slightly until the temperature and moisture content stabilize. In higher shrink materials such as acetal and nylon, the post-mold shrinkage can be significant. 

If the regions of the part shrink unequally (called as warpage) stresses are created within the part which, depending on part stiffness, may cause the part to deform or change shape and hence leading to cracks in parts during long term use.

Shrinkage is a rate, so it is expressed in percent, %.

Shrinkage Values (%) of Various Plastics




Polymer Name Min Value (%) Max Value (%)
ABS - Acrylonitrile Butadiene Styrene 0.71.6
ABS Flame Retardant 0.30.8
ABS High Heat 0.40.9
ABS High Impact 0.40.9
ABS/PC Blend - Acrylonitrile Butadiene Styrene/Polycarbonate Blend 0.50.7
ABS/PC Blend 20% Glass Fiber 0.20.3
ABS/PC Flame Retardant 0.30.6
Amorphous TPI Blend, Ultra-high heat, Chemical Resistant (High Flow) 0.81
Amorphous TPI Blend, Ultra-high heat, Chemical Resistant (Standard Flow) 0.81
Amorphous TPI, High Heat, High Flow, Transparent, Lead-Free Solderable (High Flow) 11.2
Amorphous TPI, High Heat, High Flow, Transparent, Lead-Free Solderable (Standard Flow) 11.2
Amorphous TPI, Moderate Heat, Transparent 0.50.7
Amorphous TPI, Moderate Heat, Transparent (Food Contact Approved) 0.50.7
Amorphous TPI, Moderate Heat, Transparent (Mold Release grade) 0.50.7
Amorphous TPI, Moderate Heat, Transparent (Powder form) 0.50.7
ASA - Acrylonitrile Styrene Acrylate 0.40.7
ASA/PC Blend - Acrylonitrile Styrene Acrylate/Polycarbonate Blend 0.30.7
ASA/PC Flame Retardant 0.40.8
ASA/PVC Blend - Acrylonitrile Styrene Acrylate/Polyvinyl Chloride Blend 0.30.7
CA - Cellulose Acetate 0.31
CAB - Cellulose Acetate Butyrate 0.20.9
Celllulose Diacetate-Pearlescent Films 11.5
Celllulose Diacetate-Matt Film 11.5
CP - Cellulose Proprionate 0.10.9
CPVC - Chlorinated Polyvinyl Chloride 0.30.7
ETFE - Ethylene Tetrafluoroethylene 34
EVA - Ethylene Vinyl Acetate 0.43.5
FEP - Fluorinated Ethylene Propylene 36
HDPE - High Density Polyethylene 1.54
HIPS - High Impact Polystyrene 0.20.8
HIPS Flame Retardant V0 0.30.6
LCP - Liquid Crystal Polymer 0.10.6
LCP Carbon Fiber-reinforced 0.10.5
LCP Glass Fiber-reinforced 0.10.4
LCP Mineral-filled 0.10.5
LDPE - Low Density Polyethylene 24
LLDPE - Linear Low Density Polyethylene 22.5
MABS - Transparent Acrylonitrile Butadiene Styrene 0.40.7
PA 11 - (Polyamide 11) 30% Glass fiber reinforced 0.50.5
PA 11, Conductive 0.72
PA 11, Flexible 1.41.8
PA 11, Rigid 0.72
PA 12 (Polyamide 12), Conductive 0.72
PA 12, Fiber-reinforced 0.72
PA 12, Flexible 0.72
PA 12, Glass Filled 0.72
PA 12, Rigid 0.72
PA 46 - Polyamide 46 1.52
PA 46, 30% Glass Fiber 0.31.3
PA 6 - Polyamide 6 0.51.5
PA 6-10 - Polyamide 6-10 11.3
PA 66 - Polyamide 6-6 0.73
PA 66, 30% Glass Fiber 0.50.5
PA 66, 30% Mineral filled 0.61
PA 66, Impact Modified, 15-30% Glass Fiber 0.20.6
PA 66, Impact Modified 1.23
PAI - Polyamide-Imide 0.61
PAI, 30% Glass Fiber 0.10.3
PAI, Low Friction 0.10.5
PAN - Polyacrylonitrile 0.20.5
PAR - Polyarylate 0.91.2
PARA (Polyarylamide), 30-60% glass fiber 0.10.4
PBT - Polybutylene Terephthalate 0.52.2
PBT, 30% Glass Fiber 0.21
PC (Polycarbonate) 20-40% Glass Fiber 0.10.5
PC (Polycarbonate) 20-40% Glass Fiber Flame Retardant 0.10.5
PC - Polycarbonate, high heat 0.71
PC/PBT Blend - Polycarbonate/Polybutylene Terephthalate Blend 0.61.1
PCTFE - Polymonochlorotrifluoroethylene 0.51.5
PE - Polyethylene 30% Glass Fiber 0.20.6
PEEK - Polyetheretherketone 1.21.5
PEEK 30% Carbon Fiber-reinforced 00.5
PEEK 30% Glass Fiber-reinforced 0.40.8
PEI - Polyetherimide 0.70.8
PEI, 30% Glass Fiber-reinforced 0.20.4
PEI, Mineral Filled 0.50.7
PEKK (Polyetherketoneketone), Low Cristallinity Grade 0.0040.005
PESU - Polyethersulfone 0.60.7
PESU 10-30% glass fiber 0.20.3
PET - Polyethylene Terephthalate 0.23
PET, 30% Glass Fiber-reinforced 0.21
PET, 30/35% Glass Fiber-reinforced, Impact Modified 0.20.9
PETG - Polyethylene Terephthalate Glycol 0.21
PE-UHMW - Polyethylene -Ultra High Molecular Weight 44
PFA - Perfluoroalkoxy 35
PHB - Polyhydroxybutyrate 1.21.6
PI - Polyimide 0.21.2
PLA,injection molding 0.30.5
PMMA - Polymethylmethacrylate/Acrylic 0.20.8
PMMA (Acrylic) High Heat 0.20.8
PMMA (Acrylic) Impact Modified 0.20.8
PMP - Polymethylpentene 1.62.1
PMP 30% Glass Fiber-reinforced 0.31.2
PMP Mineral Filled 1.41.7
Polyamide 66 (Nylon 66)/Carbon Fiber, Long, 30 % Filler by Weight 0.30.3
Polyamide 66 (Nylon 66)/Carbon Fiber, Long, 40 % Filler by Weight 0.30.3
Polyamide 66 (Nylon 66)/Glass Fiber, Long, 40 % Filler by Weight 0.30.3
Polyamide 66 (Nylon 66)/Glass Fiber, Long, 50 % Filler by Weight 0.30.3
Polyamide 66 (Nylon 66)/Glass Fiber, Long, 60 % Filler by Weight 0.30.3
PP Homopolymer, Long Glass Fiber, 30% Filler by Weight 0.40.4
PP Homopolymer, Long Glass Fiber, 40% Filler by Weight 0.30.3
PP Homopolymer, Long Glass Fiber, 50% Filler by Weight 0.30.3
POM - Polyoxymethylene (Acetal) 1.82.5
POM (Acetal) Impact Modified 12.5
POM (Acetal) Low Friction 1.83
POM (Acetal) Mineral Filled 1.52
PP - Polypropylene 10-20% Glass Fiber 0.31
PP, 10-40% Mineral Filled 0.61.4
PP, 10-40% Talc Filled 0.91.4
PP, 30-40% Glass Fiber-reinforced 0.011
PP (Polypropylene) Copolymer 23
PP (Polypropylene) Homopolymer 13
PP, Impact Modified 23
PPA - Polyphthalamide 1.52.2
PPA - 30% Mineral 11.2
PPA, 33% Glass Fiber-reinforced 0.50.7
PPA, 33% Glass Fiber-reinforced - High Flow 0.740.76
PPA, 45% Glass Fiber-reinforced 0.10.3
PPE - Polyphenylene Ether 0.50.8
PPE, 30% Glass Fiber-reinforced 0.10.4
PPE, Flame Retardant 0.61
PPE, Impact Modified 0.61
PPE, Mineral Filled 0.30.7
PPS - Polyphenylene Sulfide 0.61.4
PPS, 20-30% Glass Fiber-reinforced 0.20.5
PPS, 40% Glass Fiber-reinforced 0.20.5
PPS, Conductive 0.31
PPS, Glass fiber & Mineral-filled 0.30.7
PPSU - Polyphenylene Sulfone 0.70.7
PS (Polystyrene) 30% glass fiber 0.20.2
PS (Polystyrene) Crystal 0.10.7
PS, High Heat 0.20.7
PSU - Polysulfone 0.70.7
PSU, 30% Glass finer-reinforced 0.10.6
PSU Mineral Filled 0.40.5
PTFE - Polytetrafluoroethylene 36
PTFE, 25% Glass Fiber-reinforced 1.82
PVC (Polyvinyl Chloride), 20% Glass Fiber-reinforced 0.10.2
PVC, Plasticized 0.24
PVC, Plasticized Filled 0.85
PVC Rigid 0.10.6
PVDC - Polyvinylidene Chloride 0.52.5
PVDF - Polyvinylidene Fluoride 24
SAN - Styrene Acrylonitrile 0.30.7
SAN, 20% Glass Fiber-reinforced 0.10.3
SMA - Styrene Maleic Anhydride 0.40.8
SMA, 20% Glass Fiber-reinforced 0.20.3
SMA, Flame Retardant V0 0.50.5
TPS, Injection General Purpose 0.61.5
TPS, Water Resistant 0.60.9


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Gaurav Goel

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