{"id":37440,"date":"2026-06-25T01:09:33","date_gmt":"2026-06-25T01:09:33","guid":{"rendered":"https:\/\/dimud.com\/?p=37440"},"modified":"2026-06-25T01:09:58","modified_gmt":"2026-06-25T01:09:58","slug":"tpr-plastic","status":"publish","type":"post","link":"https:\/\/dimud.com\/ru\/tpr-plastic\/","title":{"rendered":"The Complete Guide to TPR Plastic Injection Molding: Properties, Comparisons, and Industry Applications"},"content":{"rendered":"\t\t
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TPR plastic has a proven track record of mature applications spanning decades in industries such as automotive, consumer electronics, and medical devices. However, engineers often face the same dilemmas when selecting materials: What exactly is the difference between TPR and TPE? In what scenarios is TPR plastic more suitable than silicone? What are the key process considerations for TPR plastic injection molding?<\/p>

Dimud\u2019s engineering team has many years of experience in processing high-performance materials for precision injection molding. This article systematically outlines the complete knowledge framework for TPR plastic from three perspectives\u2014materials science, practical processing, and material selection\u2014to help engineers and procurement teams make informed material decisions.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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What is TPR Plastic?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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TPR plastic stands for Thermoplastic Rubber and is an important subcategory of thermoplastic elastomers (TPE). From a chemical perspective, TPR plastic is typically a blend of styrene-based block copolymers (particularly SBS, or styrene-butadiene-styrene triblock copolymer) and polyolefins such as polypropylene (PP) or polyethylene (PE).<\/p>

The molecular structure of TPR plastic features a typical \u201cA-B-A\u201d block structure: the styrene (S) hard blocks at both ends impart elastic memory and physical strength similar to vulcanized rubber at room temperature, while the butadiene (B) soft block in the middle provides flexibility and elastic deformation capacity. When the temperature rises above the softening point, the hard styrene segments break down, and the material melts into a flowable melt that can be molded using standard thermoplastic processes such as injection molding and extrusion; upon cooling, the hard segments reform, and the molded part regains its elastic properties. This reversible physical cross-linking mechanism is the most fundamental material characteristic of TPR plastic and is what fundamentally distinguishes it from traditional vulcanized rubber (which undergoes chemical cross-linking and is irreversible).<\/p>

The relationship between TPR plastic and TPE often confuses engineers: TPE is a broad category encompassing various thermoplastic elastomers (including SBS-based TPR, SEBS-based TPE, TPU, TPV, etc.), whereas TPR plastic typically refers specifically to SBS-based thermoplastic rubber and its blends. In industrial practice, the two terms are sometimes used interchangeably, but strictly speaking, TPR plastic is a specific member of the broader TPE family.<\/p>

As a professional injection molding manufacturer, Dimud provides customers with end-to-end services ranging from material selection to mass production. If you are evaluating whether TPR plastic is suitable for your project, please visit the Dimud website<\/a> to contact our engineering team for expert advice.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Basic Properties of TPR Plastic<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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A comprehensive understanding of TPR properties is the foundation for selecting the right material. The following is a systematic summary of the core technical parameters of TPR plastic from multiple perspectives:<\/p>

Mechanical and Physical Properties<\/h3>
Performance indicators<\/th>Typical value range<\/th><\/tr><\/thead>
Shore A hardness<\/td>20A\u201390A (adjustable via formulation)<\/td><\/tr>
Tensile strength<\/td>5\u201325 MPa<\/td><\/tr>
Elongation at break<\/td>300%\u2013700%<\/td><\/tr>
Tear strength<\/td>15\u201360 kN\/m<\/td><\/tr>
Compression set (23\u00b0C)<\/td>20%\u201340%<\/td><\/tr>
Density<\/td>0.87\u20131.10 g\/cm\u00b3<\/td><\/tr><\/tbody><\/table><\/div>

TPR plastic has an extremely wide range of hardness (20A\u201390A), which can be flexibly customized by adjusting the SBS\/PP ratio and the amount of plasticizer. This is one of its most valuable engineering properties\u2014the same material system can range from extremely soft (with a gel-like feel) to semi-rigid (similar to hard rubber), covering a wide range of applications.<\/p>

Thermal Properties<\/h3>
Performance Metrics<\/th>Typical values<\/th><\/tr><\/thead>
Continuous operating temperature<\/td>–40\u00b0C to +100\u00b0C<\/td><\/tr>
Short-term peak heat resistance<\/td>120\u00b0C<\/td><\/tr>
Injection molding processing temperature<\/td>180\u00b0C\u2013220\u00b0C<\/td><\/tr>
Vicat softening point<\/td>75\u2013110\u00b0C<\/td><\/tr><\/tbody><\/table><\/div>

The upper heat resistance limit of TPR plastic (100\u00b0C continuously, 120\u00b0C for short periods) is its most notable performance gap compared to silicone (230\u00b0C continuously), and this should be carefully evaluated in high-temperature applications. Its low-temperature performance, however, is quite excellent; it retains good flexibility at -40\u00b0C without becoming brittle, which is a significant advantage in automotive seals and outdoor consumer products.<\/p>

Chemical Resistance<\/h3>

TPR plastic has good resistance to the following media:<\/p>