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Plastic Shrinkage Rate Chart
Below is a detailed plastic shrinkage rate chart table with polymer names (generic and specific) and min/max shrinkage rates (%) by material category for your reference
Commodity Plastics |
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| Name of the Polymer | Explicit Name of the Polymer | Min Value (%) | Max Value (%) |
| Polypropylene (Homopolymer) | PP Homopolymer | 1 | 2.5 |
| Polypropylene (Copolymer) | PP Random Copolymer | 0.8 | 2 |
| High-Density Polyethylene | HDPE | 1.5 | 4 |
| Low-Density Polyethylene | LDPE | 2 | 5 |
| Linear Low-Density Polyethylene | LLDPE | 1.5 | 3.5 |
| Polystyrene (General Purpose) | GPPS | 0.3 | 0.6 |
| High-Impact Polystyrene | HIPS | 0.3 | 0.6 |
| Polyvinyl Chloride (Rigid) | PVC-U | 0.1 | 0.6 |
| Polyvinyl Chloride (Flexible) | PVC-P | 1 | 5 |
Engineering Plastics |
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| Name of the Polymer | Explicit Name of the Polymer | Min Value (%) | Max Value (%) |
| Acrylonitrile Butadiene Styrene | ABS | 0.4 | 0.9 |
| Polycarbonate | PC | 0.5 | 0.7 |
| Polyamide 6 | Nylon 6 (PA6) | 0.7 | 1.5 |
| Polyamide 66 | Nylon 66 (PA66) | 1 | 1.6 |
| Polyoxymethylene (Homopolymer) | POM-H | 1.8 | 2.5 |
| Polyoxymethylene (Copolymer) | POM-C | 1.5 | 2 |
| Polybutylene Terephthalate | PBT | 1.2 | 2.2 |
| Polyethylene Terephthalate | PET (Amorphous) | 0.2 | 1 |
| Polyethylene Terephthalate | PET (Crystalline) | 1.2 | 2 |
| Polymethyl Methacrylate | PMMA (Acrylic) | 0.2 | 0.8 |
High-performance Plastics |
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| Name of the Polymer | Explicit Name of the Polymer | Min Value (%) | Max Value (%) |
| Polyether Ether Ketone | PEEK | 1.2 | 1.5 |
| Polyetherimide | PEI (Ultem) | 0.7 | 0.8 |
| Polyphenylene Sulfide | PPS | 0.6 | 1.4 |
| Liquid Crystal Polymer | LCP | 0.1 | 0.6 |
| Polytetrafluoroethylene | PTFE (Teflon) | 3 | 6 |
Elastomers & TPEs |
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| Name of the Polymer | Explicit Name of the Polymer | Min Value (%) | Max Value (%) |
| Thermoplastic Polyurethane | TPU | 0.8 | 1.8 |
| Styrene-Butadiene-Styrene | SBS (Thermoplastic Elastomer) | 0.5 | 1.5 |
| Thermoplastic Vulcanizate | TPV | 1 | 2.5 |
Filled/Reinforced Plastics |
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| Name of the Polymer | Explicit Name of the Polymer | Min Value (%) | Max Value (%) |
| ABS + 30% Glass Fiber | ABS-GF30 | 0.1 | 0.3 |
| Nylon 6 + 30% Glass Fiber | PA6-GF30 | 0.3 | 0.6 |
| Polypropylene + 40% Glass Fiber | PP-GF40 | 0.2 | 0.5 |
| PBT + 30% Glass Fiber | PBT-GF30 | 0.2 | 0.8 |
| PEEK + 30% Carbon Fiber | PEEK-CF30 | 0.1 | 0.3 |
Key Notes:
Shrinkage Rate Range:
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Min Value: Represents the minimum shrinkage rate of the material under ideal processing conditions.
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Max Value: Represents the maximum shrinkage rate of the material under rapid cooling or in thick-walled parts.
Influencing Factors:
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Crystallinity: Semi-crystalline materials (e.g., PP, POM) exhibit higher shrinkage rates than amorphous materials (e.g., ABS, PC).
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Fillers/Additives: Glass fiber/mineral fillers significantly reduce shrinkage rates (e.g., PA6-GF30 has >50% lower shrinkage than unfilled PA6).
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