Density of Plastic, Shrinkage, & Draft Angle Reference Charts
Shrinkage Values
| Shrinkage Values for Miscellaneous Resins | |
| Material | Shrink in/in |
| ABS High Impact | 0.005 – 0.007 |
| ABS Heat Resistant | 0.004 – 0.005 |
| ABS Medium Impact | 0.005 |
| Acetal | 0.020 – 0.035 |
| Acrylic General Purpose | 0.002 – 0.009 |
| Acrylic Heat Resistant | 0.003 – 0.010 |
| Acrylic High Impact | 0.004 – 0.008 |
| Ethylene Vinyl Acetate | 0.010 – 0.030 |
| Ionomer | 0.003 – 0.020 |
| Nylon 6/6 | 0.010 – 0.025 |
| Nylon 6/6 | 0.007 – 0.015 |
| Nylon 6/10 | 0.010 – 0.025 |
| Nylon 11 | 0.010 – 0.025 |
| Nylon 12 | 0.008 – 0.020 |
| Nylon Glass Filled | 0.005 – 0.010 |
| Polybutylene | 0.020 (molded) |
| Polybutylene | 0.040 (aged) |
| Polycarbonate | 0.005 – 0.007 |
| PET (Amorphous, petg, pctg) | 0.003 – 0.005 |
| Polyester .025 – .050 THICK | 0.006 – 0.012 |
| Polyester .050 – .100 THICK | 0.012 – 0.017 |
| Polyster .100 – .180 THICK | 0.016 – 0.022 |
| Polyester PBT | 0.010 – 0.020 |
| Polyester PET 30% GF | 0.001 – 0.002 |
| Polyester PBT 30% GF | 0.003 – 0.005 |
| POLYETHERIMIDE | 0.005 – 0.007 |
| Polyethylene Low Density | 0.015 – 0.035 |
| Polyethylene High Density | 0.015 – 0.030 |
| PPO/Styrene CO (NORYL) | 0.005 – 0.007 |
| Polypropylene | 0.010 – 0.030 |
| PPO/Styrene G.P. | 0.002 – 0.008 |
| PPO/Styrene Heat Resistant | 0.002 – 0.008 |
| PPO/Styrene Impact Mod | 0.003 – 0.006 |
| Polysulfone | 0.008 |
| Polyurethane | 0.010 – 0.020 |
| PVC Rigid | 0.002 – 0.004 |
| PVC Semi-Rigid | 0.005 – 0.025 |
| PVC Flexible | 0.015 – 0.030 |
| SAN | 0.002 – 0.006 |
Density of Plastic Values
| Density Values – Selected Resins | ||
| Material |
70°F DENSITY
gr/cc |
MELT DENSITY
gr/cc |
| ABS (Injection Grade) | 1.05 | 0.97 |
| ABS 30% GR | 1.28 | |
| Acetal | 1.42 | 1.17 |
| Acetal 20% GF | 1.55 | |
| Acrylic General Purpose) | 1.16 | 1.04 |
| Cellulose Acetate | 1.26 | 1.13 |
| Cellulose Butyrate | 1.20 | 1.07 |
| Cellulose Propionate | 1.22 | 1.10 |
| Ethylene Vinyl Acetate | 0.95 | |
| Ionomer | 0.95 | 0.73 |
| Nylon 6/6 | 1.14 | 0.97 |
| Nylon 6 | 1.13 | 0.97 |
| Nylon 6/10 | 1.08 | 0.97 |
| Nylon 6/12 | 1.07 | 0.97 |
| Nylon 11 | 1.04 | 0.97 |
| Nylon 12 | 1.02 | 0.97 |
| Nylon 30% GF | 1.36 | |
| Polybutylene | 0.92 | |
| Polycarb/Ester Alloy | 1.20 | |
| Polycarbonate | 1.20 | 1.02 |
| Polycarbonate 30% GF | 1.42 | |
| Co-Polyester PETG | 1.27 | 1.12 |
| Co-Polyester PCTG | 1.24 | 1.08 |
| Polyester PBT | 1.34 | 1.11 |
| Polyester PBT/PET 30% GF | 1.58 | |
| Polyester PET (Bottle) | 1.40 | 1.20 |
| Polytherimide | 1.27 | |
| Polyethylene Low Density | 0.92 | 0.76 |
| Polyethylene Medium Density | 0.92-0.94 | 0.74 |
| Polyethylene High Density | 0.94-0.97 | 0.72 |
| Polythyl 30% GF HDPE | 1.18 | |
| PPO/Styrene (NORYL) | 1.07 | 0.90 |
| PolyphenYlene Sulfide | 1.35-1.80 | |
| Polyphen Sulfide 40% GF | 1.65 | |
| Polypropylene | 0.90 | 0.70 |
| Polypropylene 30% GF | 1.13 | |
| POLYStyrene GP | 1.05 | 0.97 |
| POLYStyrene Impact Mod | 1.04 | 0.96 |
| Polysulfone | 1.25 | 1.16 |
| Polyurethane | 1.20 | 1.13 |
| PVC – Rigid | 1.39 | 1.30 |
| PVC – Pipe | 1.44 | 1.32 |
| PVC – Flexible | 1.29 | 1.20 |
| SAN | 1.08 | 1.00 |
| T/P Ruber (Santoprene) | 1.08 | 1.00 |
| T/P Elastomer (Urethane) | 0.97 | 0.93 |
| 0.83 | 0.82 | |
Common Abbreviations
| Common Abbreviations for Misc Resins | |
| Resin Generic Name | Common ABBR |
| Acrylonitrile-Butadiene-Styrene | ABS |
| Cellulose Acetate | CA |
| Cellulose Acetate Butyrate | CAB |
| Cellulose Acetate Propionate | CAP |
| Chlorinated Polyethylene | CPE |
| Chlorinated Polyvinyl Chloride | CPVC |
| Ethylene-Propylene Diene Rubber | EPDM |
| Expandable Polystyrene | EPS |
| Ethylene Vinyl Acetate | EVA |
| Fiber Reinforced Plastic | FRP |
| High Density Polyethylene | HDPE |
| High Impact Polystyrene | HIPS |
| Low Density Polyethylene | LDPE |
| Linear Low Density Polyethylene | LLDPE |
| Maleic Anhydride | MA |
| Medium Density Polyethylene | MDPE |
| Polyamide (Nylon) | PA |
| Polyacrylonitrile | PAN |
| Polybutylene | PB |
| Polybutylene Terephalicate | PBT |
| Polycarbonate | PC |
| Polyethylene | PE |
| Polyetheretherketone | PEEK |
| Polyetherimide | PEI |
| Polyetherketone | PEK |
| Polyethylene Terephalicate | PET |
| Polyethylene Terephalic Clycol | PETG |
| Polyimide | PI |
| Polymethyl Methacrylate | PMMA |
| Polyoxymethylene | POM |
| Polypropylene | PP |
| Chlorinated Polypropylene | PPC |
| Polyphenylene Oxide | PPO |
| Polyphenylene Sulfide | PPS |
| Polyphenylene Sulfone | PPSU |
| Polystyrene | PS |
| Polysulfone | PSU |
| Polyurethane | PU |
| Polyurethane | PUR |
| Polyvinyl Chloride | PVC |
| Reinforce Polybutylene Terephthalateic | RPBT |
| Reinfor Polyethylene Terephalic | RPET |
| Reaction Injection Molding | RIM |
| Styrene Acrylonitrile | SAN |
| Styrene Butadiene Rubber | SBR |
| Styrene Maleic Anhydride | SMA |
| Sheet Molding Compound | SMC |
| Thermoplastic Elastomer | TPE |
Draft Angle Calculation Reference Chart
Download or Print Our Draft Angle Reference Chart for 1° – 30° draft angles
How much draft angle do you need in your plastic part?
Below are draft angles commonly used from 1/32″ to 1″ are noted in degrees in the table below.
Each block is the amount of draft with the corresponding angle and depth of the cavity.
As a plastic injection molding company, we hope this information is helpful to you.
Please note our other topics related to plastic injection molding:
Why draft angles need to be considered in part design for plastic injection molding
Hot Runner and Cold Runner Systems for Plastic Injection Molding
Ultrasonic Welding of Plastic Parts: Design Considerations
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