TPE-S, TPE-E, TPE-R, and TPE-U all belong to the category of thermoplastic elastomers (TPE), with the core differences being the type of substrate polymer, molecular structure, and performance characteristics, which lead to significant differences in insulation application scenarios and process adaptability. The following is a structured comparative analysis:
Core Definition and Substrate
|
Material code |
Full name |
Substrate polymer | Structural characteristics |
| TPE-S | Styrenic thermoplastic elastomer |
Styrene butadiene styrene block copolymer (SBS) Styrene isoprene styrene block copolymer (SIS) |
Two phase structure: styrene segment (hard segment, physical cross-linking point)+rubber segment (soft segment, providing elasticity) |
| TPE-E | Polyester thermoplastic elastomer | Polybutylene terephthalate (PBT) hard segment+polyether/polyester soft segment | Block copolymer, with crystalline polyester as the hard segment and amorphous polyether/polyester as the soft segment |
| TPE-R | Rubber based thermoplastic elastomer | Dynamic vulcanized rubber (EPDM/nitrile rubber)+polypropylene (PP) matrix | Thermoplastic vulcanizate (TPV) formed by dynamic vulcanization, with the rubber phase dispersed in the PP continuous phase at the micrometer level |
| TPE-U | Polyurethane thermoplastic elastomer | Polyurethane hard segment (diisocyanate+chain extender)+polyether/polyester soft segment | The hard segment is the amino ester group (chemical cross-linking point), and the soft segment is the polyether/polyester polyol |
Key performance comparison
| Performance dimension | TPE-S | TPE-E | TPE-R | TPE-U |
| Temperature resistance range | -50℃~+80℃ (short-term) | -40℃~+120℃ (long-term) | -50℃~+135℃ (long-term) | -40℃~+100℃ (long-term) |
| Oil resistance | Poor (not resistant to mineral oil, gasoline) | Medium (resistant to vegetable oil, not resistant to mineral oil) | Excellent (resistant to mineral oil, hydraulic oil) | Excellent (resistant to mineral oil, fuel oil) |
| Weather resistance (UV/ozone) | Poor (prone to aging, requiring the addition of UV resistant agents) | Medium (polyester type has better weather resistance than polyether type) | Excellent (EPDM substrate has strong weather resistance) | Medium (polyether type is better than polyester type) |
| Elastic resilience | Medium (easy to creep after deformation) | Good (low creep) | Excellent (close to vulcanized rubber) | Excellent (high rebound, low permanent deformation) |
| Machinability | Excellent (good injection/extrusion flowability, recyclable) | Good (requires high temperature processing, easy hydrolysis) | Medium (poor flowability, requires high shear) | Good (injection/extrusion can be done, requires drying treatment) |
| Electrical insulation | Good (volume resistivity 10¹⁴~10¹⁶Ω· cm) | Good (volume resistivity 10¹³~10¹⁵Ω· cm) | Excellent (volume resistivity 10¹⁵~10¹⁷Ω· cm) | Good (volume resistivity 10¹⁴~10¹⁶Ω· cm) |
Differences in insulation application scenarios
TPE-S
Features: Low cost, easy to process, high flexibility, insulation performance meets low-voltage requirements.
Application of wires and cables: insulation of low-voltage weak current cables (such as headphone cables, data cables, toy connection cables), and temporary power cord sheaths.
Limitations: Poor temperature resistance, oil resistance, and weather resistance, not suitable for harsh environments such as industrial/automotive.
TPE-E
Features: High temperature resistance, creep resistance, high mechanical strength, good insulation stability.
Application of wires and cables: insulation for internal wiring of household appliances (such as air conditioning, washing machine motor leads), insulation for industrial control cables (temperature resistance level 125℃).
Attention: Polyester TPE-E is prone to hydrolysis and needs to be thoroughly dried before processing to avoid long-term use in humid environments.
TPE-R
Features: excellent temperature resistance, oil resistance, weather resistance, stable insulation and strong anti-aging ability.
Application of wires and cables: insulation/sheath for automotive cables (such as engine compartment wiring harness, door wiring harness), oil resistant cables for industrial equipment, and sheath for outdoor photovoltaic cables.
Advantages: It can replace traditional vulcanized rubber, achieve halogen-free environmental protection, and can be recycled and reused.
TPE-U
Features: High rebound, wear resistance, chemical corrosion resistance, excellent insulation performance.
Application of wires and cables: special cable insulation (such as robot arm cables, drag chain cables), medical cables (polyether TPE-U with good biocompatibility), and mining cable sheaths.
Limitations: Poor hydrolysis resistance, easy decomposition at high temperatures, not suitable for long-term use in humid and hot environments.
Core principles of selection
Low cost, low-voltage weak current scenarios
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-
TPE-S
Medium high temperature, home appliance/industrial control scenarios
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TPE-E
Strict oil resistance, weather resistance, automotive/outdoor scenes
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-
TPE-R
High rebound, wear-resistant, special/medical cable scenarios
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TPE-U
Industry certification adaptability
TPE-R/TPE-U: Easy to pass UL certification (such as UL 1581 temperature rating 105℃/125℃) and VDE certification (applicable to European wire standards).
TPE-E: Some grades can meet the ISO 6722 automotive cable standard.
TPE-S: Mostly used for non certified civilian cables.
