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What is TPR material, and is it suitable for your product? TPR combines rubber-like flexibility with the processing advantages of thermoplastics, making it widely used in grips, seals, footwear, wheels, and overmolded parts. This guide explains TPR material properties, applications, processing methods, TPR vs. TPE, and how to choose the right grade for your project.
Table of Contents
| 1. What Is TPR Material? |
2. What Are the Properties of TPR Material? |
| 3. Advantages and Disadvantages of TPR Material |
| 4. How Is TPR Material Processed? |
| 5. What Is TPR Material Used For? |
| 6. TPR vs. TPE: What Is the Difference? |
| 7. How to Choose the Right TPR Material |
| 8. Conclusion |
TPR stands for thermoplastic rubber, a flexible material that combines the rubber-like elasticity of traditional rubber with the processing advantages of thermoplastics. It feels soft, stretches under pressure, and can return close to its original shape. Unlike conventional rubber, TPR material softens when heated and solidifies again when cooled, so it can be processed by injection molding, extrusion, and overmolding without vulcanization.
You may also see TPR described as a type of TPE. TPE is the broader category of thermoplastic elastomers, while TPR commonly refers to styrenic compounds based on materials such as SBS or SEBS. However, suppliers may use these terms differently, so you should always confirm the specific material grade and technical data before production.
Because its hardness, color, elasticity, and surface feel can be adjusted, TPR plastic material is widely used for soft-touch grips, seals, wheels, shoe soles, household products, and overmolded parts.
The properties of TPR material vary according to its formulation, base polymer, additives, and hardness grade. In general, TPR provides a soft rubber-like feel, good flexibility, impact resistance, and easy thermoplastic processing. The following table summarizes its main properties.
Property | Typical Performance |
Flexibility | Flexible and capable of repeated bending |
Elasticity | Recovers close to its original shape after deformation |
Hardness | Available in a wide range of Shore A grades |
Impact resistance | Absorbs impact and vibration effectively |
Abrasion resistance | Moderate to good, depending on the formulation |
Water resistance | Low water absorption and good moisture resistance |
Chemical resistance | Resists many diluted acids and alkalis, but performance varies |
Temperature resistance | Depends strongly on whether the material is SBS- or SEBS-based |
Surface feel | Soft, non-slip, and rubber-like |
Colorability | Can be produced in various colors and surface finishes |
Processing | Suitable for injection molding, extrusion, and overmolding |
Recyclability | Some production scrap can be reheated and reprocessed |
TPR material is widely used because it provides rubber-like flexibility while remaining easy to process with thermoplastic manufacturing methods. However, its performance depends on the material grade and working environment. Understanding both its advantages and limitations can help you determine whether TPR is suitable for your product.
TPR provides a soft, rubber-like feel and can bend or compress without breaking easily. Its flexibility makes it suitable for handles, grips, seals, protective covers, and other products that require comfort or cushioning.
The non-slip surface of TPR improves grip, while its elasticity helps absorb shock, vibration, and impact. These characteristics are useful for tool handles, wheels, sporting goods, household products, and industrial components.
Unlike traditional rubber, TPR does not require vulcanization. It can be processed using common thermoplastic methods such as injection molding, extrusion, and overmolding. This simplifies production and makes TPR suitable for high-volume manufacturing.
Manufacturers can adjust the hardness, elasticity, color, gloss, and surface texture of TPR through different formulations. This flexibility allows the material to meet both functional and appearance requirements.
Because TPR softens again when heated, clean production scrap may be ground and reprocessed in certain applications. The allowable recycled content depends on the product requirements, material grade, and quality standards.
TPR generally has lower heat resistance than silicone and some engineering elastomers. Prolonged exposure to high temperatures may cause softening, deformation, or a reduction in mechanical performance.
Not every TPR grade is suitable for outdoor use or contact with oils, fuels, and solvents. UV exposure, ozone, and chemicals may cause discoloration, surface deterioration, or loss of elasticity unless a suitable formulation is selected.
When TPR remains compressed for an extended period, it may not return completely to its original shape. For seals and load-bearing components, compression set should be checked before selecting the material.
Some very soft TPR grades can feel sticky or attract dust. The final surface quality depends on the formulation, mold finish, processing conditions, and additives used.
TPR can bond with certain rigid plastics, but compatibility varies between grades. Poor material selection or part design may result in peeling or delamination. Chemical bonding should be verified through material data and mold trials, while mechanical interlocks can provide additional support.
Because TPR softens when heated and solidifies again when cooled, it can be processed using conventional thermoplastic equipment. The three common methods are injection molding, extrusion, and overmolding. Each process is suitable for different product structures and production requirements.
TPR injection molding is suitable for producing separate parts with complex shapes, consistent dimensions, and high-volume requirements. Its main processing steps include:
Select the appropriate TPR grade according to the required hardness, color, elasticity, temperature resistance, and product application. Some TPR grades require drying before molding, while others can be processed directly. The material supplier’s instructions should be followed.
TPR pellets are fed into the injection molding machine. The rotating screw moves the material forward while heat and shear gradually melt it into a uniform flowable state.
The molten TPR is injected into the mold cavity under controlled pressure and speed. Proper gate design and mold venting help the material fill thin walls, corners, and detailed surface features without trapping air.
Holding pressure is applied to compensate for material shrinkage and maintain the part’s dimensions. The TPR then cools and solidifies inside the mold. Cooling time depends on the material grade, wall thickness, and part size.
After the part has cooled sufficiently, the mold opens and the product is removed using ejector pins, plates, or another suitable ejection system. Adequate draft angles help prevent deformation or surface damage.
The molded part is inspected for flash, short shots, air traps, deformation, surface defects, and dimensional accuracy. Gates or runners may then be removed, followed by printing, assembly, or other post-processing when required.
TPR extrusion is commonly used for continuous products with the same cross-sectional shape, such as sealing strips, flexible tubes, cable covers, and profiles.
TPR pellets and any required color masterbatch or additives are fed into the extruder hopper. The material must be kept clean and mixed evenly to maintain consistent color and performance.
A rotating screw carries the TPR through the heated barrel. Heat and shear melt and mix the material until it reaches a uniform processing condition.
The molten TPR is pushed through a specially designed die. The die opening determines the cross-sectional shape and basic dimensions of the extruded product.
The extruded profile passes through a cooling and sizing system, usually involving air or water. Proper cooling helps maintain the required shape and reduces twisting, shrinkage, or dimensional variation.
A pulling unit moves the product forward at a controlled speed. The finished profile is then cut to the required length or wound into rolls for storage and shipment.
The finished product is checked for dimensions, surface quality, color consistency, hardness, and continuous profile stability.
TPR overmolding combines a rigid substrate with a soft TPR layer. It can be completed through insert overmolding or two-shot molding, depending on the product structure, production volume, and equipment.
Choose a TPR grade that is compatible with the rigid substrate, such as a specific grade of PP, ABS, PC, or PA. Materials with similar names may still have different bonding performance, so compatibility should be confirmed with the supplier and through testing.
The rigid plastic substrate is molded first. In insert overmolding, it is removed and placed into a second mold manually or by a robot. In two-shot molding, the substrate remains inside the machine and is transferred to the second cavity automatically.
The substrate must be positioned and fixed accurately inside the overmolding cavity. Poor positioning may lead to uneven TPR thickness, flash, deformation, or exposed areas.
Molten TPR is injected around or onto the required area of the rigid substrate. Injection speed, pressure, temperature, and venting must be controlled to ensure complete filling without moving or damaging the substrate.
During molding, the TPR may chemically bond with the substrate. Holes, grooves, undercuts, and other mechanical interlocks can also be used to improve connection strength. The combined part then cools and solidifies inside the mold.
The finished overmolded part is removed and checked for peeling, delamination, flash, incomplete filling, surface defects, and substrate deformation. Peel tests, pull tests, or functional assembly tests may be used to verify bonding strength.
TPR material is widely used in products that require flexibility, cushioning, grip, or a soft-touch surface. Its hardness, color, elasticity, and appearance can be adjusted for different product requirements. The main industries using TPR material include the following.
TPR is commonly used to manufacture shoe soles, heel inserts, protective sections, and other footwear components. It provides flexibility, cushioning, grip, and adequate abrasion resistance while being easier to process than traditional vulcanized rubber. Manufacturers can also adjust its hardness and color for different footwear designs.
In consumer products, TPR is often used for toothbrushes, razors, tool handles, kitchen utensils, and personal-care products. It can be overmolded onto a rigid plastic substrate to create a soft and non-slip surface, improving grip and user comfort without weakening the product’s main structure.
Common automotive TPR applications include interior grips, protective covers, anti-vibration components, flexible mats, cable parts, and dust covers. The material helps absorb impact, reduce vibration, and improve surface feel. Automotive applications may require specially formulated grades with suitable heat, UV, oil, and aging resistance.
TPR is used for equipment wheels, casters, protective sleeves, flexible covers, anti-slip feet, bumpers, and vibration-damping components. Its elasticity can reduce noise and shock while protecting equipment and contact surfaces. The required hardness should be selected according to the load and operating conditions.
Flexible seals, plugs, gaskets, and waterproof covers can also be made from TPR. Its flexibility allows the part to fit closely against the mating surface, while its low water absorption supports use in humid conditions. Applications involving high temperatures, aggressive chemicals, or long-term compression require careful grade selection.
TPR is found in kitchen grips, bathroom accessories, container seals, floor-protection pads, cleaning tools, and other household products. Its soft touch, moisture resistance, colorability, and non-slip surface make it suitable for products used in kitchens, bathrooms, and other everyday environments.
TPR and TPE are often confused because both describe flexible materials that combine rubber-like elasticity with thermoplastic processing. In many markets, the two terms are even used interchangeably. Technically, however, TPE is a broad material category, while TPR commonly refers to certain styrenic thermoplastic compounds, particularly SBS- or SEBS-based materials.
Comparison | TPR | TPE |
Full name | Thermoplastic Rubber | Thermoplastic Elastomer |
Material category | Commonly refers to styrenic rubber-like compounds | Broad category of thermoplastic elastomers |
Typical base materials | SBS or SEBS | TPS, TPU, TPO, TPV, COPE and PEBA |
Flexibility | Soft and flexible | Varies from very soft to relatively rigid |
Hardness | Commonly measured on the Shore A scale | Wide range, depending on the TPE family |
Heat resistance | Usually low to moderate | Varies significantly by material family |
Abrasion resistance | Suitable for general applications | TPU-based TPE generally offers better wear resistance |
Weather resistance | SEBS grades generally perform better than SBS grades | TPO and TPV grades may offer better outdoor durability |
Processing methods | Injection molding, extrusion and overmolding | Injection molding, extrusion, overmolding and other thermoplastic methods |
Typical applications | Shoe soles, grips, wheels, toys and household products | Automotive parts, seals, medical products, cable components and industrial parts |
Cost | Often economical for general-purpose products | Depends on the TPE family and performance requirements |
TPE is an umbrella term covering several families of thermoplastic elastomers. These include styrenic block copolymers, TPU, TPO, TPV and other engineering elastomers. TPR is usually used commercially to describe rubber-like styrenic compounds made from SBS or SEBS, although naming practices vary between manufacturers and regions.
Therefore, it is not always accurate to treat TPR and TPE as two completely separate materials. A TPR grade may technically belong to the broader TPE family.
Because TPE includes several material families, its properties cover a wider range than TPR. For example, TPU generally provides better abrasion resistance and mechanical strength, while TPV can offer better heat resistance and compression performance. SBS-based TPR is usually more economical but may have limited heat and weather resistance. SEBS-based TPR generally provides better aging, temperature and UV performance.
These are general comparisons rather than fixed rules. Actual performance depends on the specific formulation and grade.
Choosing the right TPR material involves more than finding a grade that feels soft enough. You need to match its hardness, mechanical performance, temperature resistance, processing behavior, and regulatory compliance with the actual requirements of your product. The following steps can help you make a more reliable choice.
Start by identifying the product’s function and working conditions. You should ask:
Will the product be used indoors or outdoors?
Will it be bent, compressed, dropped, or rubbed repeatedly?
Will it contact water, oil, cleaning agents, or chemicals?
Will it touch skin or food?
How long is the expected service life?
Is it a standalone TPR part or an overmolded component?
For example, a tool grip mainly requires softness and slip resistance, while a caster wheel needs better abrasion resistance, load capacity, and compression recovery.
TPR hardness is commonly measured on the Shore A scale. Commercial TPR grades may cover a broad range, but approximately 20–90 Shore A is common for many molded applications.
You can use the following values as an initial reference:
Typical Hardness | Suitable Applications |
20–40 Shore A | Soft grips, cushioning layers and flexible covers |
40–60 Shore A | Tool handles, seals and general overmolding |
60–80 Shore A | Wheels, shoe components and protective parts |
80–90 Shore A | Firmer parts requiring better shape retention |
These ranges are only general references. Two materials rated at 50 Shore A may still feel different because their elasticity, surface friction, and compression recovery are not identical. You should request samples whenever touch and softness are important.
Identify the lowest and highest temperatures your product will experience during use, storage, cleaning, and transportation.
As a general reference:
Standard SBS-based TPR may be suitable for approximately −40°C to 70–80°C.
Some SEBS-based grades may perform from approximately −50°C to 100–120°C.
These values vary significantly by formulation and should not be treated as guaranteed operating limits. If your product will remain close to the maximum temperature for long periods, you should review thermal aging data instead of relying only on short-term temperature resistance.
After confirming hardness and temperature, compare the mechanical data of the available grades. Important properties include:
Property | What You Should Check |
Tensile strength | Whether the material can resist being pulled apart |
Elongation at break | How far it can stretch before breaking |
Tear strength | Whether cuts or edges can spread under force |
Abrasion resistance | How quickly the surface wears during friction |
Compression set | How well it recovers after long-term compression |
Flex fatigue | Whether it can withstand repeated bending |
Many general-purpose TPR grades may have an elongation at break of approximately 200%–600%, but this can vary widely. High elongation does not automatically mean better durability. For a seal, compression set may be more important; for a wheel, abrasion and load performance should take priority.
You should list every substance and environmental condition that the part may encounter:
Water and humidity
UV radiation and ozone
Detergents and alcohol
Oils and grease
Fuels and solvents
Acids and alkalis
For an outdoor product, you should request UV-aging and weather-resistance data. For a part that contacts oil or cleaning agents, ask the supplier for chemical immersion results, including changes in weight, hardness, dimensions, and appearance.
A material that performs well in a short contact test may still swell, soften, crack, or lose elasticity after prolonged exposure.
Your TPR grade must be suitable for injection molding, extrusion, or overmolding.
For injection molding, you should review:
Melt flow and filling performance
Recommended processing temperature
Shrinkage rate
Cooling time
Demolding performance
Typical TPR molding shrinkage may fall within approximately 1%–3%, but highly filled or specially formulated grades may behave differently. This value directly affects mold dimensions and final part tolerance, so you should use the shrinkage data for the exact grade during mold design.
For TPR overmolding, you must also confirm compatibility with the rigid substrate. Even two grades both called PP or ABS may produce different bonding results.
If you plan to overmold TPR onto a rigid plastic part, you should confirm both material adhesion and product structure.
As an initial design reference:
A TPR overmold thickness of approximately 1.5–3 mm is common for many soft-touch applications.
Very thin areas may cause incomplete filling or weak bonding.
Large thickness differences may lead to sink marks and uneven cooling.
Holes, grooves, or undercuts can create mechanical interlocks when chemical adhesion is insufficient.
These values are not universal design rules. The final thickness should be evaluated according to the TPR flow, product size, grip requirements, and substrate strength.
Before confirming the material, decide whether you need:
A matte or glossy finish
A smooth or textured surface
A dry or slightly tacky touch
A specific Pantone or RAL color
A non-slip surface
Resistance to dust, staining, or color migration
Very soft or oil-rich TPR grades may feel sticky or attract dust. You should approve molded samples rather than evaluating only raw pellets or color chips because the mold texture and processing conditions can change the final appearance.
Do not assume that every TPR material is automatically non-toxic or food-safe. You should define the product’s target market and request the relevant documents, which may include:
RoHS
REACH
FDA food-contact compliance
EU food-contact compliance
EN 71 or ASTM F963 for toys
Medical or biocompatibility test reports
Skin-contact compliance
Check whether the report applies to the exact material grade and color you intend to purchase. Changing pigments or additives may affect compliance.
Finally, conduct a mold trial using the selected material. You should check:
Hardness and surface feel
Dimensions and shrinkage
Filling and venting
Flash and deformation
Color and surface consistency
Overmolding adhesion
Functional performance
For overmolded parts, peel or pull testing should be used to compare different grades. For wheels or grips, abrasion, repeated loading, and fatigue tests are more relevant. You should test the product under conditions that are as close as possible to its actual use.
Once several grades meet your technical requirements, compare their material price, molding cycle, scrap rate, processing stability, and expected annual production cost. The lowest-priced TPR is not always the most economical choice if it causes a longer cycle time or a higher rejection rate.
TPR material offers rubber-like flexibility, adjustable hardness, comfortable surface feel, and efficient thermoplastic processing. However, selecting the right grade requires you to consider temperature, mechanical performance, chemical exposure, regulatory requirements, and overmolding compatibility—not just hardness or price.
At Alpine Mold, we provide one-stop support from DFM analysis and mold development to injection molding production. If you are developing a TPR injection-molded or overmolded product, send us your STEP, X-T, or IGS drawings, together with the material grade, surface requirements, and estimated production quantity, for project evaluation and quotation.
TPR plastic can be safe for consumer products, but its safety depends on the specific formulation, pigments, processing oils, and additives. You should not assume that every TPR grade is automatically non-toxic, food-safe, or suitable for children. For food-contact, medical, toy, or skin-contact products, verify the exact material grade through relevant FDA, EU, REACH, RoHS, or toy-safety documentation.
No, TPR and PVC are different materials. TPR is a thermoplastic rubber known for its elasticity, soft touch, and flexible processing. PVC is a thermoplastic polymer that can be rigid or made flexible by adding plasticizers. TPR is commonly used for grips, seals, shoe soles, and overmolded parts, while PVC is widely used for pipes, cables, flooring, films, and packaging.
Property | TPR | PVC |
Material type | Thermoplastic rubber | Thermoplastic polymer |
Flexibility | Naturally rubber-like and elastic | Depends on the amount of plasticizer |
Surface feel | Soft and non-slip | Can be rigid or flexible |
Common uses | Grips, soles, seals and wheels | Pipes, cables, flooring and films |
Processing | Injection molding and extrusion | Injection molding, extrusion and calendaring |
Plasticizers | Depends on the formulation | Often required for flexible PVC |
Neither material is universally better; the right choice depends on your product requirements. TPR is often more economical and provides a softer, comfortable feel, making it suitable for grips, toys, shoe soles, and general household products. TPU usually offers better abrasion resistance, tear strength, load capacity, and resistance to oils, making it more suitable for demanding wheels, protective parts, and industrial components.
If you need a soft-touch material at a lower cost, TPR may be the better option. If your product requires higher wear resistance and mechanical strength, TPU is usually more suitable.
TPR is thermoplastic, so clean production scrap can often be ground, reheated, and reprocessed. However, the amount of recycled material that can be added depends on the product’s performance, appearance, color, and regulatory requirements. Repeated heating may reduce elasticity, strength, or surface quality.
TPR that is contaminated, painted, assembled with other materials, or bonded to a rigid substrate through overmolding can be more difficult to separate and recycle.
