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Resin Mold Shrink Rate

Molding shrinkage refers to the percentage reduction in room temperature dimensions of a plastic part after being released from its mold and allowed to cool to room temperature, when compared with its initial uncooled dimensions. Shrinkage occurs both due to thermal expansion/contraction within resin itself as well as various molding factors; hence its rate after molding should be known as molding shrinkage – this term is popularly employed within polymer science.

MaterialDensity g/cm3Molding Shrinkage (%)
LDPE0.92-0.931.5-5.0%
LLDPE0.92-0.942.0-2.2%
EVA0.92-0.940.7-3.5%
HDPE0.95-0.971.5-4.0%
HDPE (30%GF)1.18-1.280.2-0.6%
PP (homopolymer)0.90-0.921.0-2.5%
PP (copolymer)0.89-0.911.0-2.5%
PP (10~40% Talc)0.97-1.270.8-2.2%
PP (10~40% CaCO3)0.97-1.250.7-1.8%
PP (10~40% Mica)0.99-1.330.5-1.5%
PP (10~30% GF)0.97-1.140.2-0.8%
PP (40% GF)1.22-1.230.3-0.5%
PS1.04-1.050.4-0.8%
PS (20%GF)1.20.1-0.3%
PS (30%GF)1.290.1-0.2%
HIPS1.03-1.060.4-0.7%
SAN1.06-1.080.3-0.5%
SAN (20%GF)1.22-1.400.1-0.3%
ABS1.04-1.080.4-0.9%
ABS (20%GF)1.18-1.220.1-0.2%
ABS (30%GF)1.290.2-0.3%
PMMA1.17-1.20MD 0.1-0.4% / TD 0.2-0.8%
PMMA1.150.3-0.8%
MXD6 (20%GF)1.520.43%
MXD6 (30%GF)1.460.51-0.57%
MXD6 (40%GF)1.560.42-0.49%
MXD6 (50%GF)1.65-1.670.35-0.47%
MXD6 (55%GF)1.70.21%
MXD6 (60%GF)1.790.40%
MXD6 (20%CF)1.430.15%
MXD6 (30%CF)1.350.23%
MXD6 (20%MR)1.640.44%
PC (10%GF)1.27MD 0.3-0.5% / TD 0.4-0.6%
PC (20%GF)1.35MD 0.1-0.3% / TD 0.3-0.5%
PC (30%GF)1.43MD 0.5-0.25% / TD 0.25-0.45%
PC (40%GF)1.52MD 0.05-0.25% / TD 0.2-0.4%
PC (50%GF)
PC (10%CF)1.24MD 0.1-0.3% / TD 0.3-0.5%
PC (20%CF)1.28MD 0.05-0.2% / TD 0.2-0.4%
PC (30%CF)1.31MD 0.01-0.15% / TD 0.2-0.4%
PC (10%GF 10%CF)1.31MD 0.1-0.3% / TD 0.2-0.4%
PC (10%GF 20%CF)1.35MD 0.02-0.15% / TD 0.15-0.35%
PC (10%PTFE)1.280.70%
PC (30%PTFE)1.390.90%
PC/ABS1.250.5-0.7%
PC/ABS1.130.4-0.6%
PC/ABS1.120.3-0.5%
PC/ABS (10%GF)1.28MD 0.2-0.4% / TD 0.3-0.5%
PC/ABS (20%GF)1.34MD 0.1-0.3% / TD 0.2-0.4%
PC/ABS (30%GF)1.44MD 0.05-0.25% / TD 0.2-0.4%
PC/PET1.2-1.260.5-1.9%
PC/PBT1.30.5-0.7%
PA61.13-1.16MD 1.0-1.8% / TD 1.3-2.2%
PA6 (10%GF)1.2MD 0.4% / TD 1.3%
PA6 (15%GF)1.23MD 0.4% / TD 1.3%
PA6 (20%GF)1.27MD 0.3% / TD 1.2%
PA6 (30%GF)1.36MD 0.3% / TD 1.0%
PA6 (33%GF)1.39MD 0.3% / TD 1.0%
PA6 (35%GF)1.41MD 0.3% / TD 1.0%
PA6 (40%GF)1.49MD 0.2% / TD 0.8%
Toughed PA61.02-1.07MD 1.5% / TD 2.2%
PA661.13-1.150.7-1.8%
PA66 (15%GF)1.21-1.230.5-0.98%
PA66 (30~33%GF)1.25-1.400.2-0.6%
PA66 (50%GF)1.560.2-0.7%
PA66 (30%CF)1.3-1.310.30%
PA66 (40%CF)1.36-1.380.20%
PA66 (30%PTFE)1.21.00%
PA66 (10%PTFE)1.340.70%
PA461.181.8-2.0%
PA46 (15%GF)1.30.5-0.9%
PA46 (30%GF)1.410.4-0.6%
PA46 (50%GF)1.620.2-0.4%
PPA (33%GF)1.48MD 0.2-0.4% / TD 0.4-0.8%
PPA (45%GF)1.59MD 0.2% / TD 0.6%
PPA (30%MD)1.45MD 1.1% / TD 1.1%
PPA (45%MD)1.53MD 1.0% / TD 1.0%
PPA (65%MD)1.9MD 0.3% / TD 0.5%
PA111.03-1.051.20%
PA121.01-1.020.3-1.5%
PA6101.08-1.10.5-1.5%
PA6121.06-1.11.10%
PA612 (30%GF)1.30-1.380.2-0.5%
PA612 (10%PTFE)1.131.20%
PPA1.171.5-2.0%
PPA (15%GF)1.260.5-0.7%
PPA (33%GF)1.430.2-0.5%
PPA (45%GF)1.560.2-0.3%
POM (homopolymer)1.421.8-2.5%
POM (copolymer)1.42.0-2.2%
POM (10%GB)1.47MD 1.9% / TD 1.6%
POM (25%GB)1.58MD 1.8% / TD 1.5%
POM (10%GF)1.461.10%
POM (25%GF)1.59MD 0.4% / TD 1.2%
POM (10%MF)1.491.70%
POM (20%MF)1.55-1.590.90%
POM (20%CF)1.460.40%
POM (10%PTFE)1.462.00%
POM (20%PTFE)1.512.0-2.5%
IM POM1.29-1.351.2-1.7%
mPPE1.06-1.100.5-0.7%
mPPE (10%GF)1.15-1.17MD 0.2-0.4% / TD 0.3-0.5%
mPPE (15%GF)1.19-1.21MD 0.2-0.4% / TD 0.3-0.5%
mPPE (20%GF)1.22-1.24MD 0.1-0.2% / TD 0.2-0.4%
mPPE (30%GF)1.31-1.33MD 0.1-0.2% / TD 0.2-0.4%
mPPE (25%GF 15%Filler)1.42MD 0.05-0.25% / TD 0.1-0.3%
mPPE (5%PTFE)1.110.5-0.7%
mPPE (10%PTFE)1.120.5-0.7%
mPPE (15%PTFE)1.150.5-0.7%
PPE/PA6 alloy1.11MD 1.2-1.4% / TD 1.1-1.3%
PPE/PA6 (20%GF)1.26MD 0.3-0.5% / TD 0.4-0.6%
PPE/PA66 alloy1.10-1.13MD 1.1-1.3% / TD 1.1-1.3%
PET1.29-1.400.2-3.0%
PET (15%GF)1.330.1-0.4%
PET (30%GF)1.55-1.700.2-0.9%
PET (45%GF)1.58-1.740.2-0.9%
PETG1.270.2-0.5%
PCTG1.230.2-0.5%
PBT1.3-1.431.2-2.5%
PBT (UL-HB)1.26-1.30(3mm) MD 2.2-2.3% TD 2.0-2.1%
PBT (UL-HB)1.26-1.31(1mm) MD 1.5-1.6% TD 1.4-1.5%
PBT (UL-V2-V0)1.42(3mm) MD 2.2-2.4% TD 2.0%
PBT (UL-V2-V0)1.42(1mm) MD 1.4% TD 1.4%
PBT (15%GF)1.41(3mm) MD 0.4-0.7% TD 1.3-1.5%
PBT (15%GF)1.41(1mm) MD 0.5% TD 1.0%
PBT (20%GF)1.480.4-1.4%
PBT (30%GF)1.52(3mm) MD 0.2-0.3% TD 0.5-1.3%
PBT (30%GF)1.52(1mm) MD 0.1-0.3% TD 0.4-0.8%
PBT (45%GF)1.67(3mm) MD 0.2% TD 0.9%
PBT (45%GF)1.67(1mm) MD 0.1% TD 0.6%
PPS1.31-1.35MD 1.1-1.6% TD 1.6-1.8%
PPS (30%GF)1.57MD 0.3-0.4% TD 0.6-07%
PPS (40%GF)1.68MD 0.3% TD 0.5-0.7%
PPS (50%GF)1.75MD 0.4% TD 0.6%
PPS (65%GF/MF)1.91-1.98MD 0.2-0.3% TD 0.4-0.6%
PPS (30%CF)1.44MD 0.1% TD 0.6%
LCP1.35-1.840.1-0.6%
LCP (15%GF)1.5MD 0.1% TD 0.4%
LCP (30%GF)1.62MD 0.2% TD 0.4%
LCP (30%GF)1.62MD 0-0.2% TD 0.1-0.78%
LCP (50%GF)1.79MD 0.2% TD 0.4%
LCP (30%CF)1.49MD 0.1% TD 0.3%
PAI1.420.6-0.85%
PAI (30%GF)1.610.1-0.25%
PEI1.270.5-0.7%
PSF1.230.6-0.7%
PSF (25%MD)1.48MD 0.5% TD 0.5%
PSF (40%MD)1.61MD 0.5% TD 0.8%
PSF (10%GF)1.41MD 0.4% TD 0.5%
PSF (20%GF)1.47MD 0.3% TD 0.5%
PSF (30%GF)1.52MD 0.2% TD 0.6%
PSF (40%GF)1.66MD 0.2% TD 0.6%
PES1.370.6-0.7%
PES (10%GF)1.450.5-0.6%
PES (20%GF)1.510.4-0.6%
PES (30%GF)1.53-1.600.4-0.6%
PPSF1.29-1.370.5-0.8%
PI1.33-1.430.80%
PI (30%GF)1.560.40%
PI (30%CF)1.430.20%
TPU (Shore A 72)1.040.8-1.2%
TPU (Shore A 92)1.090.6-1.0%
TPU (Shore D 67)1.110.4-0.6%
TPU (20%GF)1.22-1.360.4-1.0%
TPU (30%LGF)1.430.2-0.6%
TPU (40%LGF)1.520.1-0.5%
TPU (60%LGF)1.760.1-0.3%
TPU (20%BaSO4)1.24-1.320.4-1.2%
TPU (40%BaSO4)1.48-1.550.4-1.2%
PVC1.65-1.700.5-2.5%
Silicone1.08-1.140-0.5%
TPO0.95-1.00.8-1.0%
TPV0.94-1.051.5-2.5%

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