Overview
TPU (Thermoplastic Polyurethane) is a high-performance elastomeric thermoplastic that combines the flexibility of rubber with the processability of plastic. TPU is renowned for its exceptional abrasion resistance, elasticity, impact strength, tear resistance, oil resistance, and durability.
Unlike traditional thermoset rubbers, TPU can be repeatedly melted and reshaped, making it highly suitable for injection molding, extrusion, and additive manufacturing. TPU is available in a wide range of hardness levels, from soft flexible grades to semi-rigid engineering materials.
TPU is widely used in:
- Consumer Electronics
- Automotive Components
- Medical Devices
- Industrial Equipment
- Footwear
- Sporting Goods
- Protective Cases
- Flexible Tubing
Due to its outstanding balance of flexibility, toughness, and wear resistance, TPU has become one of the fastest-growing engineering elastomers worldwide.
Material Specification
| Property | Value |
|---|---|
| Material Designation | TPU |
| Full Name | Thermoplastic Polyurethane |
| Material Family | Thermoplastic Elastomer (TPE) |
| Density | 1.10–1.30 g/cm³ |
| Appearance | Transparent, Translucent, Colored |
| Hardness Range | Shore A 60 – Shore D 75 |
| Typical Manufacturing Methods | Injection Molding, Extrusion, Blow Molding, 3D Printing |
| Standard Forms | Pellets, Sheets, Film, Tubing, Filament |
Chemical Composition
TPU is produced through the reaction of polyols, diisocyanates, and chain extenders.
| Component | Function |
|---|---|
| Polyol | Flexibility |
| Diisocyanate | Structural Backbone |
| Chain Extender | Mechanical Strength |
| Additives | Processing & Performance Enhancement |
The segmented molecular structure provides a combination of elasticity and toughness.
Common TPU Grades
| Grade | Characteristics |
|---|---|
| Polyester TPU | Excellent Wear Resistance |
| Polyether TPU | Superior Hydrolysis Resistance |
| Aliphatic TPU | UV Stability & Color Retention |
| Medical Grade TPU | Biocompatibility |
| Flame Retardant TPU | Enhanced Fire Performance |
| TPU 95A | Popular Flexible Grade |
Mechanical Properties
Typical Values
| Property | Value |
|---|---|
| Tensile Strength | 25–60 MPa |
| Elongation at Break | 300–700% |
| Tear Strength | 60–200 kN/m |
| Compression Set | Low |
| Hardness | Shore A 60–98 |
| Impact Resistance | Outstanding |
Typical Mechanical Performance
| Property | Performance |
|---|---|
| Elasticity | Outstanding |
| Abrasion Resistance | Outstanding |
| Tear Resistance | Outstanding |
| Fatigue Resistance | Excellent |
TPU provides some of the highest abrasion resistance among thermoplastic elastomers.
Physical Properties
| Property | Value |
|---|---|
| Density | 1.10–1.30 g/cm³ |
| Water Absorption | Low |
| Thermal Conductivity | 0.20–0.30 W/m·K |
| Transparency | Available |
| Surface Finish | Smooth |
TPU offers excellent aesthetics and tactile properties.
Thermal Properties
| Property | Value |
|---|---|
| Continuous Service Temperature | -40°C to 90°C |
| High-Performance Grades | Up to 120°C |
| Melting Temperature | 160–220°C |
| Brittleness Temperature | Below -40°C |
TPU maintains flexibility across a wide temperature range.
Strength-to-Weight Ratio
| Material | Density (g/cm³) | Tensile Strength |
|---|---|---|
| TPU | 1.20 | 45 MPa |
| Silicone | 1.20 | 8 MPa |
| EPDM | 1.10 | 12 MPa |
| NBR | 1.20 | 18 MPa |
TPU offers significantly higher mechanical strength than most conventional elastomers.
Chemical Resistance
| Chemical Environment | Performance |
|---|---|
| Oils & Greases | Excellent |
| Lubricants | Excellent |
| Hydrocarbons | Good |
| Water | Good |
| Dilute Acids | Good |
| Dilute Alkalis | Moderate |
| Solvents | Moderate |
| Strong Acids | Poor |
Polyether TPU grades generally offer superior hydrolysis resistance.
Wear & Abrasion Resistance
| Property | Performance |
|---|---|
| Abrasion Resistance | Outstanding |
| Wear Resistance | Outstanding |
| Scratch Resistance | Excellent |
| Surface Durability | Excellent |
TPU is often selected when long-term wear resistance is critical.
UV & Weather Resistance
| Property | Performance |
|---|---|
| UV Resistance | Good |
| Outdoor Durability | Good |
| Ozone Resistance | Good |
| Weather Resistance | Good |
Aliphatic TPU grades provide significantly improved UV stability.
Electrical Properties
| Property | Value |
|---|---|
| Volume Resistivity | >10¹¹ Ω·cm |
| Dielectric Strength | 15–25 kV/mm |
| Dielectric Constant | 5–7 |
| Electrical Insulation | Good |
TPU is commonly used in cable protection and electronic accessories.
Biocompatibility
| Property | Performance |
|---|---|
| Medical Grades Available | Yes |
| Skin Contact Safety | Excellent |
| Wearable Device Compatibility | Excellent |
| Sterilization Compatibility | Good |
Medical-grade TPU is widely used in healthcare applications.
Manufacturing Characteristics
| Manufacturing Process | Rating |
|---|---|
| Injection Molding | Outstanding |
| Extrusion | Outstanding |
| Blow Molding | Excellent |
| Thermoforming | Good |
| 3D Printing (FDM) | Outstanding |
TPU is one of the most widely used flexible materials for additive manufacturing.
3D Printing Characteristics
| Property | Performance |
|---|---|
| FDM Printability | Excellent |
| Layer Adhesion | Outstanding |
| Flexibility | Outstanding |
| Impact Resistance | Excellent |
TPU 95A is one of the most popular flexible 3D printing materials.
International Equivalent Standards
| Standard | Equivalent |
|---|---|
| ASTM | TPU |
| ISO | Thermoplastic Polyurethane |
| DIN | TPU |
| JIS | TPU |
| GB/T (China) | 热塑性聚氨酯弹性体 |
| USP Class VI | Medical Grades Available |
Available Forms
| Product Type | Availability |
|---|---|
| Pellets | Yes |
| Sheets | Yes |
| Film | Yes |
| Tubing | Yes |
| Filament | Yes |
| Injection Molded Parts | Yes |
Typical Applications
Consumer Electronics
- Phone Cases
- Wearable Device Components
- Cable Protection
- Electronic Housing Overmolds
Automotive Industry
- Seals
- Air Ducts
- Interior Components
- Protective Covers
Medical Industry
- Catheters
- Medical Tubing
- Wearable Devices
- Healthcare Equipment Components
Industrial Equipment
- Rollers
- Belts
- Protective Covers
- Flexible Connectors
Footwear Industry
- Shoe Soles
- Sports Footwear Components
- Cushioning Systems
Sporting Goods
- Protective Equipment
- Flexible Grips
- Athletic Components
Advantages
Outstanding Abrasion Resistance
One of the most wear-resistant elastomeric materials available.
Exceptional Toughness
Maintains performance under repeated impact and flexing.
High Elasticity
Provides excellent flexibility and recovery.
Oil & Grease Resistance
Suitable for industrial and automotive environments.
Excellent Aesthetics
Available in transparent and colored grades.
Recyclable Thermoplastic
Can be reprocessed unlike thermoset rubbers.
Limitations
Moderate Heat Resistance
Not suitable for continuous exposure above 100–120°C.
Moisture Sensitivity During Processing
Requires proper drying before molding.
Chemical Resistance Limitations
Certain solvents and strong acids may cause degradation.
Higher Material Cost
More expensive than many commodity elastomers.
Comparison with Common Elastomers
| Property | TPU | Silicone | EPDM | NBR |
|---|---|---|---|---|
| Abrasion Resistance | Outstanding | Moderate | Good | Excellent |
| Tear Resistance | Outstanding | Good | Good | Excellent |
| Oil Resistance | Excellent | Moderate | Poor | Outstanding |
| Weather Resistance | Good | Outstanding | Outstanding | Poor |
| Flexibility | Outstanding | Outstanding | Excellent | Good |
Comparison with Silicone
| Property | TPU | Silicone |
|---|---|---|
| Abrasion Resistance | Better | |
| Tear Strength | Better | |
| Mechanical Strength | Higher | |
| Heat Resistance | Lower | |
| UV Resistance | Lower |
TPU is often selected when mechanical durability is more important than extreme temperature performance.
Available Surface Finishes
Standard Finishes
- Gloss Finish
- Matte Finish
- Molded Finish
Functional Finishes
- Soft-Touch Finish
- Textured Grip Surface
- Transparent Finish
Specialty Grades
- TPU 85A
- TPU 95A
- Medical Grade TPU
- Flame Retardant TPU
- Aliphatic TPU
Frequently Asked Questions (FAQ)
What is TPU?
TPU (Thermoplastic Polyurethane) is a flexible engineering thermoplastic that combines rubber-like elasticity with plastic processing capabilities.
What is TPU used for?
Typical applications include:
- Phone Cases
- Medical Tubing
- Shoe Soles
- Industrial Rollers
- Automotive Components
Is TPU flexible?
Yes. TPU is highly flexible and available in a wide range of hardness levels.
Is TPU abrasion resistant?
Yes. TPU provides some of the best abrasion resistance among elastomeric materials.
Can TPU be 3D printed?
Yes. TPU is one of the most popular flexible materials for FDM 3D printing.
Why choose TPU?
Because it combines:
- Outstanding Wear Resistance
- High Elasticity
- Excellent Toughness
- Oil Resistance
- Attractive Surface Finish
What is the difference between TPU and Silicone?
TPU offers higher mechanical strength and abrasion resistance, while Silicone provides better temperature resistance and UV stability.
Does GCNOV provide TPU manufacturing services?
Yes. GCNOV provides:
- TPU Injection Molding
- TPU Overmolding
- TPU Extrusion
- TPU 3D Printing
- Medical TPU Components
- Prototype Development
- Low-Volume Production
- Mass Production