The Universal Selection Source: Plastics & Elastomers


Shrinkage

The shrinkage of plastics designates 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. Shrinkage is a rate, so it is expressed in percent. Semi-crystalline polymers (e.g: PBT or PP) always show a higher shrinkage than amorphous polymers (e.g: PS or PC) because when cooled down semi-crystalline polymers will see part of their macromolecular chains re-arranged to form crystallite, that is a well-organized structure, leading to less space needed for the same amount of atoms. This volume contraction of polymers often leads to wrapped parts and dimension differences between manufactured parts and the mold (the die if we consider extrusion as the processing technique). The shrinkage rate is strongly depending on the polymer itself but also on the processing conditions applied and part design. A standard method to measure “mold shrinkage”, ie contraction compared to the injection molding tool, is the ASTM D955. Other international standard methods related to plastic shrinkage are: ISO 294-4 (for thermoplastics) and ISO 2577 (for thermosets).

Name of the polymer Explicit name of the polymer Min Value(%) Max Value(%)
ABS Acrylonitrile-Butadiene Styrene 0.700 1.600
ABS FR Acrylonitrile-Butadiene Styrene flame retardant 0.300 0.800
ABS High Heat Acrylonitrile-Butadiene Styrene High Heat 0.400 0.900
ABS High Impact Acrylonitrile-Butadiene Styrene High Impact 0.400 0.900
ABS/PC Acrylonitrile-Butadiene Styrene/Polycarbonate 0.500 0.700
ABS/PC 20% GF Acrylonitrile-Butadiene Styrene/Polycarbonate 20% glass fiber 0.200 0.300
ABS/PC FR Acrylonitrile-Butadiene Styrene/Polycarbonate flame retardant 0.300 0.600
Amorphous TPI Blend, Ultra-high heat, Chemical Resistant (High Flow) Amorphous TPI Blend, Ultra-high heat, Chemical Resistant (High Flow) 0.800 1.000
Amorphous TPI Blend, Ultra-high heat, Chemical Resistant (Standard Flow) Amorphous TPI Blend, Ultra-high heat, Chemical Resistant (Standard Flow) 0.800 1.000
Amorphous TPI, High Heat, High Flow, Transparent, Lead-Free Solderable (High Flow) Amorphous TPI, High Heat, High Flow, Transparent, Lead-Free Solderable (High Flow) 1.000 1.200
Amorphous TPI, High Heat, High Flow, Transparent, Lead-Free Solderable (Standard Flow) Amorphous TPI, High Heat, High Flow, Transparent, Lead-Free Solderable (Standard Flow) 1.000 1.200
Amorphous TPI, Moderate Heat, Transparent Amorphous TPI, Moderate Heat, Transparent 0.500 0.700
Amorphous TPI, Moderate Heat, Transparent (Food Contact Approved) Amorphous TPI, Moderate Heat, Transparent (Food Contact Approved) 0.500 0.700
Amorphous TPI, Moderate Heat, Transparent (Mold Release grade) Amorphous TPI, Moderate Heat, Transparent (Mold Release grade) 0.500 0.700
Amorphous TPI, Moderate Heat, Transparent (Powder form) Amorphous TPI, Moderate Heat, Transparent (Powder form) 0.500 0.700
ASA Acrylonitrile Styrene Acrylate 0.400 0.700
ASA/PC Acrylonitrile Styrene Acrylate/Polycarbonate 0.300 0.700
ASA/PC FR Acrylonitrile Styrene Acrylate/Polycarbonate flame retardant 0.400 0.800
ASA/PVC Acrylonitrile Styrene Acrylate/Polyvinyl Chloride 0.300 0.700
CA - Cellulose Acetate Cellulose Acetate 0.300 1.000
CAB - Cellulose Acetate Butyrate Cellulose Acetate Butyrate 0.200 0.900
Celllulose Diacetate- Pearlescent Films Celllulose Diacetate- Pearlescent Films 1.000 1.500
Celllulose Diacetate-Matt Film Celllulose Diacetate-Matt Film 1.000 1.500
CP - Cellulose Proprionate Cellulose Proprionate 0.100 0.900
CPVC - Chlorinated Polyvinyl Chloride CPVC - Chlorinated Polyvinyl Chloride 0.300 0.700
ETFE Ethylene Tetrafluoroethylene 3.000 4.000
EVA Ethylene Vinyl Acetate 0.400 3.500
FEP Fluorinated Ethylene Propylene 3.000 6.000
HDPE - High Density Polyethylene HDPE - High Density Polyethylene 1.500 4.000
HIPS - High Impact Polystyrene HIPS - High Impact Polystyrene 0.200 0.800
HIPS FR V0 High Impact Polystyrene flame retardant V0 0.300 0.600
LCP Liquid Crystal Polymer 0.100 0.600
LCP CF Liquid Crystal Polymer carbon fiber 0.100 0.500
LCP GF Liquid Crystal Polymer glass fiber 0.100 0.400
LCP MINERAL Liquid Crystal Polymer mineral 0.100 0.500
LDPE - Low Density Polyethylene LDPE - Low Density Polyethylene 2.000 4.000
LLDPE - Linear Low Density Polyethylene LLDPE - Linear Low Density Polyethylene 2.000 2.500
MABS Transparent Acrylonitrile Butadiene Styrene 0.400 0.700
PA 11 30% Glass fiber reinforced Polyamide 11 30% Glass fiber reinforced 0.500 0.500
PA 11 conductive Polyamide 11 conductive 0.700 2.000
PA 11 flexible Polyamide 11 flexible 1.400 1.800
PA 11 rigid Polyamide 11 rigid 0.700 2.000
PA 12 conductive Polyamide 12 conductive 0.700 2.000
PA 12 fiber reinforced Polyamide 12 fiber reinforced 0.700 2.000
PA 12 flexible Polyamide 12 flexible 0.700 2.000
PA 12 glass filled Polyamide 12 glass filled 0.700 2.000
PA 12 rigid Polyamide 12 rigid 0.700 2.000
PA 46 Polyamide 46 1.500 2.000
PA 46 30% GF Polyamide 46 30% glass fiber 0.300 1.300
PA 6 Polyamide 6 0.500 1.500
PA 6-10 Polyamide 6-10 1.000 1.300
PA 66 Polyamide 6-6 0.700 3.000
PA 66 30% GF Polyamide 6-6 30% glass fiber 0.500 0.500
PA 66 30% mineral filled Polyamide 6-6 30% mineral filled 0.600 1.000
PA 66 IM 15-30% GF Polyamide 6-6 impact modified 15-30% glass fiber 0.200 0.600
PA 66 impact modified Polyamide 6-6 impact modified 1.200 3.000
PAI Polyamide-Imide 0.600 1.000
PAI 30% GF Polyamide-Imide 30% glass fiber 0.100 0.300
PAI low friction Polyamide-Imide low friction 0.100 0.500
PAN Polyacrylonitrile 0.200 0.500
PAR Polyarylate 0.900 1.200
PARA 30-60% GF Polyarylamide 30-60% glass fiber 0.100 0.400
PBT Polybutylene Terephthalate 0.500 2.200
PBT 30% GF Polybutylene Terephthalate 30% glass fiber 0.200 1.000
PC 20-40% GF Polycarbonate 20-40% glass fiber 0.100 0.500
PC 20-40% GF FR Polycarbonate 20-40% glass fiber flame retardant 0.100 0.500
PC high heat Polycarbonate high heat 0.700 1.000
PC/PBT Polycarbonate/Polybutylene Terephthalate blend 0.600 1.100
PCTFE Polymonochlorotrifluoroethylene 0.500 1.500
PE 30% GF Polyethylene 30% glass fiber 0.200 0.600
PEEK Polyetheretherketone 1.200 1.500
PEEK 30% CF Polyetheretherketone 30% carbon fiber 0.000 0.500
PEEK 30% GF Polyetheretherketone 30% glass fiber 0.400 0.800
PEI Polyetherimide 0.700 0.800
PEI 30% GF Polyetherimide 30% glass fiber 0.200 0.400
PEI mineral filled Polyetherimide mineral filled 0.500 0.700
PEKK– Low cristallinity grade Polyetherketoneketone– Low cristallinity grade 0.004 0.005
PESU Polyethersulfone 0.600 0.700
PESU 10-30% GF Polyethersulfone 10-30% glass fiber 0.200 0.300
PET Polyethylene Terephtalate 0.200 3.000
PET 30% GF Polyethylene Terephtalate 30% glass fiber 0.200 1.000
PET 30/35% GF Impact modified Polyethylene Terephtalate 30/35% glass fiber impact modified 0.200 0.900
PET G Polyethylene Terephtalate Glycol 0.200 1.000
PE-UHMW Polyethylene -Ultra High Molecular Weight 4.000 4.000
PFA Perfluoroalkoxy 3.000 5.000
PHB - Polyhydroxybutyrate Polyhydroxybutyrate 1.200 1.600
PI Polyimide 0.200 1.200
PLA-injection molding Polylactide-injection molding 0.300 0.500
PMMA Polymethylmethacrylate (Acrylic) 0.200 0.800
PMMA high heat Polymethylmethacrylate (Acrylic) high heat 0.200 0.800
PMMA Impact modified Polymethylmethacrylate (Acrylic) impact modified 0.200 0.800
PMP Polymethylpentene 1.600 2.100
PMP 30% GF Polymethylpentene 30% glass fiber 0.300 1.200
PMP mineral filled Polymethylpentene mineral filled 1.400 1.700
Polyamide 66 (Nylon 66)/Carbon Fiber, Long, 30 % Filler by Weight Polyamide 66 (Nylon 66)/Carbon Fiber, Long, 30 % Filler by Weight 0.300 0.300
Polyamide 66 (Nylon 66)/Carbon Fiber, Long, 40 % Filler by Weight Polyamide 66 (Nylon 66)/Carbon Fiber, Long, 40 % Filler by Weight 0.300 0.300
Polyamide 66 (Nylon 66)/Glass Fiber, Long, 40 % Filler by Weight Polyamide 66 (Nylon 66)/Glass Fiber, Long, 40 % Filler by Weight 0.300 0.300
Polyamide 66 (Nylon 66)/Glass Fiber, Long, 40 % Filler by Weight Polyamide 66 (Nylon 66)/Glass Fiber, Long, 40 % Filler by Weight 0.300 0.300
Polyamide 66 (Nylon 66)/Glass Fiber, Long, 50 % Filler by Weight Polyamide 66 (Nylon 66)/Glass Fiber, Long, 50 % Filler by Weight 0.300 0.300
Polyamide 66 (Nylon 66)/Glass Fiber, Long, 50 % Filler by Weight Polyamide 66 (Nylon 66)/Glass Fiber, Long, 50 % Filler by Weight 0.300 0.300
Polyamide 66 (Nylon 66)/Glass Fiber, Long, 60 % Filler by Weight Polyamide 66 (Nylon 66)/Glass Fiber, Long, 60 % Filler by Weight 0.300 0.300
Polyamide 66 (Nylon 66)/Glass Fiber, Long, 60 % Filler by Weight Polyamide 66 (Nylon 66)/Glass Fiber, Long, 60 % Filler by Weight 0.300 0.300
Polypropylene Homopolymer (PP Homopolymer)/Glass Fiber, Long, 30 % Filler by Weight Polypropylene Homopolymer (PP Homopolymer)/Glass Fiber, Long, 30 % Filler by Weight 0.400 0.400
Polypropylene Homopolymer (PP Homopolymer)/Glass Fiber, Long, 40 % Filler by Weight Polypropylene Homopolymer (PP Homopolymer)/Glass Fiber, Long, 40 % Filler by Weight 0.300 0.300
Polypropylene Homopolymer (PP Homopolymer)/Glass Fiber, Long, 40 % Filler by Weight Polypropylene Homopolymer (PP Homopolymer)/Glass Fiber, Long, 40 % Filler by Weight 0.300 0.300
Polypropylene Homopolymer (PP Homopolymer)/Glass Fiber, Long, 50 % Filler by Weight Polypropylene Homopolymer (PP Homopolymer)/Glass Fiber, Long, 50 % Filler by Weight 0.300 0.300
Polypropylene Homopolymer (PP Homopolymer)/Glass Fiber, Long, 50 % Filler by Weight Polypropylene Homopolymer (PP Homopolymer)/Glass Fiber, Long, 50 % Filler by Weight 0.300 0.300
POM Polyoxymethylene (acetal) 1.800 2.500
POM impact modified Polyoxymethylene (acetal) impact modified 1.000 2.500
POM low friction Polyoxymethylene (acetal) low friction 1.800 3.000
POM mineral filled Polyoxymethylene (acetal) mineral filled 1.500 2.000
PP 10-20% GF Polypropylene 10-20% glass fiber 0.300 1.000
PP 10-40% mineral filled Polypropylene 10-40% mineral filled 0.600 1.400
PP 10-40% TALC Polypropylene 10-40% talc 0.900 1.400
PP 30-40% GF Polypropylene 30-40% glass fiber 0.100 1.000
PP copo Polypropylene copolymer 2.000 3.000
PP homo Polypropylene homopolymer 1.000 3.000
PP impact modified Polypropylene impact modified 2.000 3.000
PPA Polyphthalamide 1.500 2.200
PPA – 30% mineral Polyphthalamide– 30% mineral 1.000 1.200
PPA – 33% glass fiber Polyphthalamide – 33% glass fiber 0.500 0.700
PPA – 33% glass fiber – high flow Polyphthalamide– 33% glass fiber – high flow 0.740 0.760
PPA – 45% glass fiber Polyphthalamide– 45% glass fiber 0.100 0.300
PPE Polyphenylene Ether 0.500 0.800
PPE 30% GF Polyphenylene Ether 30% glass fiber 0.100 0.400
PPE FR Polyphenylene Ether flame retardant 0.600 1.000
PPE impact modified Polyphenylene Ether impact modified 0.600 1.000
PPE mineral filled Polyphenylene Ether mineral filled 0.300 0.700
PPS Polyphenylene Sulfide 0.600 1.400
PPS 20-30% GF Polyphenylene Sulfide 20-30% glass fiber 0.200 0.500
PPS 40% GF Polyphenylene Sulfide 40% glass fiber 0.200 0.500
PPS conductive Polyphenylene Sulfide conductive 0.300 1.000
PPS GF & mineral Polyphenylene Sulfide glass fiber & mineral 0.300 0.700
PS 30 % GF Polystyrene 30% glass fiber 0.200 0.200
PS crystal Polystyrene crystal 0.100 0.700
PS high heat Polystyrene high heat 0.200 0.700
PSU Polysulfone 0.700 0.700
PSU 30% GF Polysulfone 30% glass fiber 0.100 0.600
PSU mineral filled Polysulfone mineral filled 0.400 0.500
PTFE Polytetrafluoroethylene 3.000 6.000
PTFE 25% GF Polytetrafluoroethylene 25% glass fiber 1.800 2.000
PVC 20% GF Polyvinyl Chloride 20% glass fiber 0.100 0.200
PVC plasticized Polyvinyl Chloride plasticized 0.200 4.000
PVC plasticized filled Polyvinyl Chloride plasticized filled 0.800 5.000
PVC rigid Polyvinyl Chloride rigid 0.100 0.600
PVDC Polyvinylidene Chloride 0.500 2.500
PVDF Polyvinylidene Fluoride 2.000 4.000
SAN Styrene Acrylonitrile 0.300 0.700
SAN 20% GF Styrene Acrylonitrile 20% glass fiber 0.100 0.300
SMA Styrene Maleic Anhydride 0.400 0.800
SMA 20% GF Styrene Maleic Anhydride 20% glass fiber 0.200 0.300
SMA FR V0 Styrene Maleic Anhydride flame retardant V0 0.500 0.500
TPS-Injection General Purpose Thermoplastic Starch GP 0.600 1.500
TPS-Injection Water Resistant Thermoplastic Starch WR 0.600 0.900
XLPE - Crosslinked Polyethylene XLPE - Crosslinked Polyethylene 0.700 5.000

Disclaimer: all data and information obtained via the Polymer Selector including but not limited to material suitability, material properties, performances, characteristics and cost are given for information purpose only. Although the data and information contained in the Polymer Selector are believed to be accurate and correspond to the best of our knowledge, they are provided without implied warranty of any kind. Data and information contained in the Polymer Selector are intended for guidance in a polymer selection process and should not be considered as binding specifications. The determination of the suitability of this information for any particular use is solely the responsibility of the user. Before working with any material, users should contact material suppliers in order to receive specific, complete and detailed information about the material they are considering. Part of the data and information contained in the Polymer Selector are genericised based on commercial literature provided by polymer suppliers and other parts are coming from assessments of our experts.

Copyright SpecialChem SA
Back to Top