When your product requires a soft touch, elastic recovery, shock absorption, sealing capabilities, or the overmolding of soft and hard materials, TPE is typically the material of choice for injection molding. However, “TPE” is neither a specific grade nor a resin with fixed properties; rather, it refers to an entire family of thermoplastic elastomers, with significant variations across different types regarding heat resistance, oil resistance, compression set, abrasion resistance, and cost.
Therefore, simply specifying “TPE 70A” when selecting a material is far from sufficient. Two TPE materials with the same hardness may differ significantly: one might be suitable for overmolding onto PP while the other is compatible only with ABS; one might withstand long-term contact with lubricating oil, whereas the other could swell and soften within just a few days.
This article will help product engineers, procurement professionals, R&D teams, and hardware startups address several practical issues:
- What exactly is TPE plastic?
- How should one choose between different types of TPE?
- Which projects are suitable—or unsuitable—for TPE plastic?
- How can risks associated with TPE plastic injection molding, overmolding, and mass production be managed?
- How does TPE compare to PVC?
What Is TPE?
TPE stands for Thermoplastic Elastomer. TPE plastic exhibits rubber-like softness, elasticity, and resilience at room temperature, yet when heated, it melts, flows, and can be injection molded just like ordinary thermoplastics.。
This is the most important engineering benefit of TPE material: it combines, to a certain extent, the characteristics of elastomers and thermoplastics.
Traditional rubber typically requires vulcanization. Once vulcanization is complete, the molecular chains form a permanent cross-linked structure, and the material cannot be remelted. TPE plastic derives its elasticity from a reversible physical structure: when heated, the rigid phase softens, allowing the material to flow; upon cooling, the structure reforms, and elasticity is restored. As a result, it can be processed using techniques such as injection molding, extrusion, blow molding, two-color injection molding, and overmolding.
“TPE rubber” is a common informal term used in the market to emphasize the material’s rubber-like feel and elasticity, but strictly speaking, TPE plastic is not the same as natural rubber, EPDM, NBR, or silicone rubber.
TPR and TPE are not two parallel concepts either. TPR typically refers to styrene-based thermoplastic elastomers in the SBS or SEBS systems, which are a branch of the TPE family. To learn more about the relationship between the two, you can read Dimud’s TPR Plastic Guide.
How Does TPE Plastic Work?
Most TPE plastics contain both “hard phases” and “soft phases.”
The soft phase is responsible for stretching, bending, cushioning, and resilience; the hard phase forms structures resembling physical cross-links at room temperature, restricting permanent molecular chain slippage and enabling the material to return to its original shape after deformation.
When TPE is heated to processing temperatures, the hard phase softens or melts, causing the original physical cross-linked structure to temporarily disappear; this allows the material to flow through the gate and fill the mold cavity under the propulsion of the screw. Upon cooling, the hard phase re-aggregates, restoring the part’s elasticity and dimensional stability.
The structure of TPV is slightly different. TPV typically consists of dynamically vulcanized EPDM rubber particles dispersed within a thermoplastic matrix, such as PP. Although the rubber phase is chemically cross-linked, the continuous thermoplastic matrix remains capable of melt flow, allowing the TPE material to be processed using conventional thermoplastic equipment.
This is also why different TPE compounds cannot be compared solely based on hardness. Base polymers, plasticizing oils, PP content, fillers, flame retardants, UV stabilizers, color masterbatches, and adhesion modifiers all influence the final properties.
Key Properties and Technical Specifications of TPE Plastic
| Leistungsspezifikationen | Common scope or manifestations | Auswirkungen auf das Produktdesign |
|---|---|---|
| Härte | Approximately Shore A 5–95, with some grades reaching the Shore D scale | Determines tactile feel, deformation, demolding, and sealing pressure |
| Dichte | 0.85–1.30 g/cm³ | Affects part weight and material cost per unit volume |
| Zugfestigkeit | 2–50 MPa | TPU and TPC values are typically higher than those of standard TPS |
| Dehnung bei Bruch | 200%–800% | It cannot independently represent long-term resilience |
| Operating temperature | -50°C to above 150°C, depending on the system | There are significant differences between standard TPS and high-performance TPC/TPA |
| Schrumpfungsrate beim Spritzgießen | Approximately 0.3%–2.5% for styrene systems | SEBS and ultra-soft formulations typically exhibit greater shrinkage |
| Chemikalienbeständigkeit | From Good to Great | Testing must incorporate combinations of oil, fuel, cleaning agents, and contact time |
| UV resistance | Depends on the polymer and stabilizer | SBS is not suitable for direct, long-term outdoor use |
| Colorability | Im Allgemeinen besser | Natural-colored TPS is particularly suitable for the aesthetic design of consumer products |
| Elektrische Isolationseigenschaften | Generally good | The grade must still be selected based on voltage, temperature, and UL requirements |
In projects, we typically do not look solely at tensile strength. For handles, buttons, seals, or vibration-damping components, more valuable metrics are:
- Shore A or Shore D hardness (refer to ASTM D2240 or ISO 868 standards);
- Compression set (temperature, compression ratio, and duration must be specified);
- Tensile strength and elongation at break;
- Tear strength;
- Abrasion resistance;
- Low-temperature resilience and high-temperature aging;
- Peel strength (adhesion to substrate);
- Resistance to UV, ozone, sweat, oils/grease, and cleaning agents;
- UL 94, food contact, or biocompatibility requirements.
In my experience, simply telling a supplier you need “70A TPE plastic” does not constitute a proper material specification. Hardness is merely a starting point, not the final conclusion for material selection.
Advantages of TPE Plastic
No vulcanization required; suitable for high-efficiency mass production
Traditional rubber requires a curing period, whereas TPE plastic is primarily shaped through cooling after being injected into the mold. For small- and medium-sized parts with a well-designed structure, production cycles are typically shorter, and automation is easier to implement.
Capable of co-molding soft and hard materials
TPE plastic can be overmolded onto PP, ABS, PC, PC/ABS, PA, or metal structures to provide non-slip, sealing, cushioning, and insulation functions. A well-designed overmolding solution can eliminate the need for adhesives, screws, or separate soft components, thereby reducing assembly costs and potential points of failure.
Hardness, feel, and color are adjustable
By adjusting the base polymer, oil, fillers, and additives in the TPE compound, it is possible to achieve a range of hardness levels—from gel-like to semi-rigid—as well as dry, silky, high-friction, or matte textures.
Production waste can be remelted
TPE plastic sprue material and test mold material that is homogeneous, clean, and has not undergone severe thermal degradation can typically be reused in controlled proportions. However, “reprocessable” does not mean it can be recycled indefinitely. Thermal history, contamination, color, and multi-material structures can all limit the proportion of recycled material that can be used.
Helps reduce the number of parts
At the right production volume, TPE plastic overmolding can integrate a rigid skeleton, a soft-touch surface, a sealing edge, and a cushioning structure into a single component. While the unit cost of the material may increase, the overall costs associated with assembly, inventory, and quality control for the product may decrease.
Limitations of TPE Plastic
TPE plastic is not a universal substitute for silicone, EPDM, or all types of soft PVC.
The property of TPE that is most often overestimated is its long-term sealing ability. Just because a part springs back quickly when pressed by hand does not mean it will still maintain its sealing force after 1,000 hours of compression at 80°C. The feel of the material at room temperature and its permanent deformation under high-temperature compression are two distinct metrics.
Other common limitations include:
- Standard TPS grades have limited heat, oil, and solvent resistance;
- Ultra-soft grades are prone to mold sticking, deformation, and ejector pin marks;
- Low-hardness TPEs typically exhibit higher shrinkage and poorer dimensional stability;
- High temperatures, high shear, or excessive residence times can lead to degradation, odors, and discoloration;
- Oils or low-molecular-weight components in certain formulations may migrate to the surface;
- Materials do not naturally bond simply because they are both classified as “TPE”;
- Specialized grades are required for flame retardancy, medical applications, food contact, and low-odor requirements;
- TPEs are generally unsuitable for use as high-rigidity, load-bearing structural components.
What Are the Types of TPE Plastic?
The six main types of TPE commonly found in the industry are as follows.
| Typ | Wichtigste Merkmale | Typische Anwendungen | Key Limitations |
|---|---|---|---|
| TPS, TPE-S, or SBC | Soft, easy to dye, relatively inexpensive, and easy to process | Handles, toys, buttons, and everyday items with rubber coating | Average heat resistance, oil resistance, and compression set |
| TPO | Low density, weather-resistant, and has good chemical resistance | Automotive interior and exterior trim, protective components, and architectural components | They are generally less elastic and softer to the touch than TPS |
| TPV | Heat-resistant, weather-resistant, and fatigue-resistant, with good long-term resilience | Automotive Seals, Sleeves, Bellows, and Gaskets | It costs more than a standard TPS, and the design options are relatively limited |
| TPU | Abrasion-resistant, tear-resistant, high-strength, and reasonably oil-resistant | Casters, protective covers, cables, moving parts | Hygroscopic; must usually be thoroughly dried before injection molding |
| TPC or TPE-E | Heat-resistant, fatigue-resistant, oil-resistant, and with excellent dynamic performance | Automotive Bellows, Hoses, and Industrial Fittings | The hardness is typically high, and the material cost is relatively high |
| TPA, PEBA, or COPA | Low-temperature flexibility, lightweight, and fatigue resistance | Medical catheters, sports equipment, precision flexible tubing | High cost; stringent requirements for drying and processing control |
TPS: The most common soft-touch TPE
TPS encompasses SBS, SIS, SEBS, and other styrene block copolymer systems. SBS offers lower costs and ease of processing but exhibits relatively poor resistance to UV and thermal aging. SEBS, being hydrogenated, demonstrates superior weather, heat, and oxidation resistance, making it better suited for high-end consumer goods, medical-grade formulations, and components intended for long-term use.
TPO: Suitable for lightweight applications and outdoor environments
TPO is based primarily on polyolefins and offers low density, as well as good water, chemical, and weather resistance. While TPO is frequently used for automotive bumpers, interior skins, and large protective components, it is generally not the first choice when an ultra-soft tactile feel is desired.
TPV: Closer to rubber for long-term service
TPV is particularly well-suited for parts requiring repeated compression, thermal aging resistance, weather resistance, and long-term shape retention. If a project involves automotive seals, under-the-hood protective boots, or industrial bellows, I typically prioritize evaluating TPV rather than resorting to trial-and-error with low-cost TPS.
TPU: Superior wear resistance and mechanical strength
TPU is often more reliable than standard TPE rubber when parts must withstand abrasion, stretching, impact, or repeated bending. It is suitable for applications such as casters, drive belts, sports equipment, mobile phone protective cases, and cable sheaths. However, TPU is sensitive to moisture; inadequate drying can lead to silver streaks, air bubbles, and hydrolysis of the molecular chains
TPC and TPA: For projects with higher performance ceilings
TPC and TPA are suitable for environments involving high fatigue, wide temperature ranges, low-temperature impact, or contact with oils. Due to their higher material costs and processing complexity, they are not appropriate choices when the sole objective is achieving a “better feel.”
Under What Circumstances Should TPE Plastic Be Chosen for Injection Molding?
The following applications are generally worth prioritizing for the evaluation of TPE plastics:
The product requires a soft touch or anti-slip functionality
Tool handles, gripping areas on medical equipment, control knobs, and sports equipment can benefit from soft-touch surface layers that enhance friction and comfort. In this context, hardness alone is not the only factor; frictional performance must also be tested under conditions involving dry hands, wet hands, sweat, and oily residue.
The product requires cushioning, shock absorption, or noise reduction.
TPE plastic can be used to absorb shock and vibration in applications such as robot limit blocks, electronic device cushioning pads, automotive interior components that prevent noise, and protective parts for transport.
The part requires repeated bending or elastic deformation
TPE elastomers are suitable for cable end caps, flexible hinges, dust caps, and buttons. However, sharp corners and localized stress concentrations should be avoided during design; otherwise, even the best materials will tear at their weakest points.
The product requires an integrated hardware-software design
When soft components need to be permanently attached to a rigid frame, consider overmolding services oder two-shot injection molding. Medium production volumes are typically suitable for overmolding, while stable, high-volume projects make it easier to spread the cost of the two-color mold investment.
The project needs to rapidly scale up production
Once the design is finalized and the materials have been validated, TPE plastic can be produced reliably using multi-cavity molds and automated equipment, making it suitable for a gradual transition from low-volume validation to mass production.
Under What Circumstances Should TPE Plastic Not Be Chosen?
The component needs to withstand high-temperature compression over the long term
For high-temperature seals, steam valves, and components subjected to repeated high-temperature sterilization, silicone rubber, FKM, EPDM, or specialized TPV should be prioritized for evaluation. Just because a standard TPE plastic can withstand a certain temperature for a short period does not mean it is suitable for long-term use at that temperature.
The product is in continuous contact with fuel, aromatic solvents, or highly corrosive media
Standard SBS and SEBS formulations may experience swelling, softening, or a decline in performance. Such applications should undergo immersion testing, and comparisons should be made with TPU, TPC, TPV, FKM, or other engineering materials.
The part bears the primary structural load
TPE plastic is suitable for providing elasticity but is not suitable for replacing PA, PBT, PC, or metal in bearing primary structural loads. Products combining hard and soft materials should typically consist of a rigid base material that bears the load, with TPE plastic providing the surface and elastic properties.
The tolerance requirements are very strict
Ultra-soft parts are susceptible to shrinkage, post-shrinkage, clamping force, and ambient temperature. Imposing tolerances on low-hardness TPE plastic that are comparable to those for POM or metal parts typically results in high mold adjustment and screening costs.
Demand is very low, and the design has not yet been finalized
If only a few prototype parts are needed, it is generally not cost-effective to develop an injection mold right away. Instead, you can first use soft 3D printing, vacuum casting, or machining to validate the structure using alternative materials, and then use small-batch injection molding to validate the production-grade materials.
No specific grade was found that meets the regulatory requirements
“Food-grade TPE” and “medical-grade TPE” cannot be relied upon based solely on verbal statements from suppliers. Mass production should not begin without specific grades, compliance statements, batch traceability, and the necessary testing.
What Are the Uses of TPE Plastic?
Kfz-Teile
TPE plastic can be used for door seals, wire harness sleeving, cup holders, dust covers, interior knobs, shock-absorbing pads, glass trim, and flexible components around the engine compartment. For interior applications, attention must be paid to odor, VOCs, and misting; for exterior applications, attention must be paid to UV exposure, ozone, and temperature cycling; and for engine compartment applications, resistance to oil and high-temperature aging must also be verified.
Unterhaltungselektronik
Common applications include headphone components, cell phone cases, buttons, wearable device wristbands, charger sleeves, and non-slip footpads. Consumer electronics projects often require a combination of aesthetic appeal, tactile feel, low odor, sweat resistance, and good adhesion to PC/ABS substrates.
Medizinische Geräte
Medical-grade TPE plastic can be used for tubing, seals, drip chambers, face masks, grip areas, and connectors; however, safety must be verified for specific formulations and end uses. Suppliers of medical-grade materials typically provide specific ISO 10993 test reports or regulatory documentation, but these documents do not automatically replace the risk assessment and validation required for the final medical device. Teknor Apex’s medical-grade TPE documentation also explicitly links compliance to specific product lines and formulations, rather than to the general term “TPE.”
Industrial and Robotic Components
TPE plastic can be used for bellows, dust boots, vibration-damping feet, flexible connectors, cable sheaths, sensor protective coatings, and mechanical stop blocks. For industrial applications, lubricants, cleaning agents, cyclic stress, and ambient temperature should be specifically verified.
Consumer Goods and Tools
TPE plastic is widely used in toothbrushes, razors, kitchen utensils, power tools, toys, and sports equipment to provide a soft feel and slip-resistant properties. When these products come into contact with skin, food, or children, it is necessary to verify compliance with the relevant regulations of the target market.
Key Parameters for TPE Plastic Injection Molding
There is no one-size-fits-all set of parameters for TPE plastic that applies to all systems. The ranges below are suitable as a starting point for trial molding; settings for mass production must be based on the material supplier’s Technical Data Sheet (TDS).
| Material Systems | Common Melt Temperature References | Anforderungen an die Trocknung | Major Processing Risks |
|---|---|---|---|
| SBS/SEBS-Type TPS | 170–230°C | Most standard grades do not require this; special moisture-absorbing grades are an exception | Flash, shrinkage, sticking to the mold, thermal degradation |
| TPO | 180–230°C | It is usually not necessary | Runoff marks, weld lines, and surface irregularities |
| TPV | 190–240°C | Not required for most grades; for special formulations, refer to the TDS | Rough surface, insufficient filling |
| TPU | 190–230°C | A dehumidifying dryer is usually required | Hydrolysis, silver threads, bubbles, brittleness |
| TPC | 210–250°C | It must usually be thoroughly dried | Hydrolysis, excessively long retention time |
| TPA | 220–280°C | It usually must be dried | Moisture Absorption, Degradation, and Dimensional Changes |
Do not assume that the material is fully dried just because the hopper has been heated. For TPU, TPC, and TPA, the dew point and temperature of the drying air, the drying time, the material bed thickness, and the exposure time of the material after it enters the machine all affect the final moisture content.
TPE Plastic Injection Molding Process
Material Verification and Pre-Treatment
Prior to mass production, verify the material name, full grade designation, batch number, color, recycled material ratio, and drying requirements. When changing materials, thoroughly clean the hopper, screw, and hot runner to prevent cross-contamination between different TPE compounds or other resins.
Plasticization and Melt Control
Most TPEs exhibit shear thinning behavior, meaning their viscosity decreases at higher shear rates, allowing for the filling of thinner sections. However, high injection speeds cannot compensate for improper gate and vent designs. Excessively high speeds may cause scorching, spatter marks, and flash.
The temperature in the rear section of the barrel should generally not be set too high, as this can easily lead to bridging at the feed inlet or premature softening of the material. Avoid leaving TPE plastic in the barrel or hot runner for extended periods when the machine is shut down.
Filling and Holding Pressure
The injection speed should aim to be fast, stable, and free of excessive shear. Holding pressure is only necessary until the gate freezes. Excessive holding pressure does not resolve all shrinkage issues; instead, it may cause flash, internal stress, and difficulty in demolding.
Cooling and Demolding
Even when the surface of soft TPE plastic has cooled, the interior may still be prone to deformation. Premature ejection can leave ejector pin marks, scratches, or permanent deformation. The mold should use larger ejector pins, ejector plates, or air-assisted ejection to reduce localized pressure.
Key Considerations for TPE Plastic Parts and Mold Design
Gleichmäßige Wandstärke gewährleisten
Sudden changes in wall thickness can cause flow stagnation, cavitation, sink marks, and uneven cooling. Generally, 1–3 mm can serve as a preliminary design range for many small- and medium-sized TPE plastic parts, but the actual thickness still depends on flow length, hardness, and functionality.
Thick sections should be hollowed out
Increasing thickness does not necessarily improve the reliability of soft parts. Excessively thick areas can prolong cooling time, increase shrinkage, and reduce dimensional stability. A better approach is typically to provide support through ribs, fillets, and rigid frames.
Provide Sufficient Draft Angles
Soft materials have high friction and are prone to clinging to the core. For long core-pull areas, it is recommended to start by evaluating a draft angle of 3°–5° on one side; deeply textured surfaces require larger draft angles.
Venting Must Be Sufficiently Fine
For styrene-based TPE plastics, Avient recommends a typical end vent groove depth of approximately 0.012–0.025 mm. Excessively deep vents can cause flash, while vents that are too shallow can lead to scorching, short shots, and reduced weld line strength.
Gates Should Prioritize Entry into Thicker Areas
Gate locations should ensure the flow path is as balanced as possible while avoiding high-stress areas and critical appearance surfaces. Soft materials are prone to stringing; therefore, hidden gates and pin-point gates must be validated for specific grades.
Common Causes of Failure in TPE Plastic Overmolding
The most common cause of overmolding failure is not insufficient injection pressure, but rather an incorrect material pairing from the outset.
It is usually easy to find a suitable polyolefin-based TPE for bonding to PP substrates; however, ABS, PC, PC/ABS, and PA require adhesive-modified grades developed specifically for these polar materials. Metal or low-surface-energy materials often require mechanical interlocks, surface treatment, or a primer.
Reliable bonding also depends on:
- Whether the substrate surface contains oil, release agent, or moisture;
- Whether the substrate temperature is sufficient;
- The dwell time between secondary injection molding cycles;
- Whether the TPE melt temperature promotes interfacial diffusion;
- The overmolding thickness and flow direction;
- Whether through-holes, undercuts, and grooves are designed to provide mechanical interlocking;
- Peeling, sweat, and temperature cycling in the product’s actual operating environment.
Compatibility charts can only help narrow down material options; they are not a substitute for mold testing. For critical products, test specimens should be made using the final substrate and the final TPE plastic to undergo 90° or 180° peel, aging, and environmental testing.For more information on structural design methods, see “Was ist Overmolding? Verfahren, Design und Anwendungen.”
Common Defects in TPE Plastic Injection Molding and Solutions
| Defects | Common Causes | Priority Inspection Areas |
|---|---|---|
| Blitzlicht | Low material viscosity, excessive degassing, and insufficient clamping force | Reduce local speed and temperature, and inspect the parting line |
| Material shortage | Low melt temperature, small gate, and insufficient venting | Improve effective fluidity, enlarge the gate, and improve venting |
| Trail | Variations in filling speed, sudden changes in wall thickness, and improper gate placement | Optimizing Speed Curves and Flow Paths |
| Charred | Stagnant air, high-speed compressed air, materials left in place for too long | Increase end-of-line exhaust to reduce residence time |
| Silver threads or bubbles | Moisture absorption or thermal degradation of the material | Check the Actual Moisture Content and the Drying System |
| Thimble Mark | The part is too soft, insufficient cooling, and the ejection area is too small | Extend the cooling time, increase the ejector pin diameter, or use an ejector plate |
| Sticking to the mold | Insufficient draft angle, core tightly encased, surface too smooth | Increase the slope, adjust the texture, and use air release |
| Delamination of the rubber coating | Material incompatibility, substrate contamination, or low temperature | Change the adhesive grade and add mechanical interlocks |
| Warping | Differences in flow contraction, excessive holding pressure, and uneven cooling | Adjust the gate, holding pressure, and cooling circuits |
TPE vs. PVC: Which One Should You Choose?
When comparing TPE and PVC, one should not focus solely on the unit price of the materials. Instead, one should compare performance, regulatory compliance, and processing and assembly costs throughout the product’s entire life cycle.
| Comparison Items | TPE Plastic | Weich-PVC |
|---|---|---|
| Elastic recovery | Usually better | Depending on the plasticizer system, changes may occur over time |
| Low-Temperature Flexibility | Most compatible models performed well | Some formulations become hard at low temperatures |
| Flame Retardancy | A specialized flame-retardant formulation is required | PVC has good inherent flame retardancy |
| Material Density | Usually lower | Usually higher |
| Plasticization Method | Based on elastomer structures or compounding systems | Softness is achieved primarily through the use of plasticizers |
| Umspritzen | Adhesive formulations can be developed for materials such as PP, ABS, PC, and PA | It bonds easily to PVC substrates |
| Processing Risks | The main issues are moisture absorption, shrinkage, flash, and sticking to the mold | Overheating causes it to degrade and release corrosive gases |
| Reuse of Production Waste | Cleaning a single material is usually easier | It can be recycled, but sorting and thermal stability control are more complex |
| Kosten | Standard grades are typically higher than soft PVC | Usually lower |
| Die wichtigsten Vorteile | Rebound, Feel, Low-Temperature Performance, Soft and Hard Rubber Coating | Cost-effective, flame-retardant, and proven cable and tubing systems |
If a product prioritizes resilience, low-temperature flexibility, soft or hard coating, low density, or a PVC-free material strategy, I tend to prioritize TPE.
If a project places a high priority on raw material costs or inherent flame retardancy, or if existing products and certification systems are already based on soft PVC, PVC may be the more reasonable choice. Modern soft PVC can also use non-phthalate plasticizers, so the assumption that “all PVC is harmful” should not be used as a basis for material selection.
Similarly, TPE plastic is not inherently safe, additive-free, or biodegradable. One must verify the specific TPE compound rather than relying on the general material category name. For information regarding the properties and processing limitations of PVC, please consult Dimud’s article on PVC materials and the relevant data in the injection molding materials database.
How Can We Control the Total Cost of a TPE Plastic Project?
Relying solely on price-per-kilogram comparisons can easily lead to the wrong material choice. True per-unit cost comprises:
Per-unit cost = Material usage + Injection cycle time + Mold amortization + Scrap loss + Secondary processing + Assembly + Quality verification
A cheaper TPE grade might ultimately cost more than a more stable-performing one if it requires longer cooling times, produces excessive flash, or leads to overmolding delamination. Conversely, a bonding-grade TPE with a higher unit price could actually lower the total product cost by eliminating the need for adhesives, screws, and manual assembly.
For startups and new product projects, I recommend conducting small-batch validation with actual materials before committing to multi-cavity molds and automation solutions. For mature products, the focus should be on evaluating cycle times, cavity counts, regrind strategies, automated part removal, and assembly integration.
Dimud supports the entire process—from DFM, mold development, and trial validation to mass production—through its Dienstleistungen im Bereich Kunststoff-Spritzgießen.
FAQ
TPE behaves more like rubber in terms of performance but more like a thermoplastic in terms of processing. It is elastic, but it can be heated until it melts and processed via injection molding or extrusion.
There is no single material that is universally superior. When resilience, low-temperature flexibility, and overmolding are required, TPE plastic is generally a better choice; when low cost, inherent flame retardancy, or a proven PVC system are needed, soft PVC may be more suitable.
It cannot be generally stated that all TPE rubber is safe. Suitability can only be confirmed after a specific grade has been shown to meet the food contact, medical, biocompatibility, or chemical restriction requirements for the intended application and has undergone the necessary finished product validation.
A whole TPE plastic part is not the same as a microplastic particle, but cutting, wear, aging, or improper disposal may result in polymer particles smaller than 5 mm. The fact that a material can be remelted does not mean it is biodegradable. The European Commission also defines microplastics as plastic particles that are typically smaller than 5 mm and difficult to remove from the environment.
Moving From Material Names to Verifiable Mass-Production Solutions
When selecting TPE plastic, the real question isn’t “Which TPE is the best?” but rather:
How flexible does this part need to be? At what temperature will it operate? What media will it come into contact with? How long does it need to maintain its sealing force? What substrate will it be overmolded onto? What is the target production volume? Which market is the product intended for?
Only after these questions are answered can the TPE plastic’s material system, hardness, adhesion level, mold structure, and testing standards be accurately determined.
Dimud possesses integrated capabilities in mold manufacturing, CNC machining, injection molding, and electronic assembly. For TPE projects, we can conduct DFM analysis starting from the product design phase to evaluate material compatibility, overmolding structures, shrinkage, venting, demolding, and mass production cycle times. This helps customers transition smoothly from prototype validation to stable production, rather than discovering—only after the mold is complete—that the materials cannot bond or that the parts cannot function reliably over the long term.
