Suzhou Volsun Electronics Technology Co., Ltd.
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TZRS-PTFE
VOLSUN
In the demanding world of high-performance cable insulation and protection, the Double-Layer PTFE FEP Heat Shrink Tube represents a technological advancement that bridges chemical resistance and ease of installation. This innovative tubing combines a chemically inert PTFE inner layer with a heat-shrinkable FEP outer layer, creating a composite solution that delivers the best properties of both fluoropolymers. Designed for applications where extreme chemical exposure, high temperatures, and reliable insulation are critical, it outperforms single-material alternatives in industries ranging from chemical processing to medical device manufacturing.
The tubing's unique dual-layer construction pairs a PTFE inner layer (polytetrafluoroethylene) with an FEP outer layer (fluorinated ethylene propylene) . PTFE provides exceptional chemical resistance to virtually all industrial solvents, acids, and bases, while FEP offers easier processing with a lower shrink temperature and superior mechanical strength . This combination creates a tube that resists chemical attack from the inside while maintaining structural integrity and easy installation from the outside.
This heat shrink tube operates continuously at -200°C to 200°C (-328°F to 392°F) and withstands short-term exposure up to 260°C (500°F) , making it suitable for cryogenic applications as well as high-heat environments . The PTFE inner layer maintains flexibility at extremely low temperatures, preventing cracking in cold conditions, while the FEP outer layer provides dimensional stability at elevated temperatures.
With a dielectric strength of 25 kV/mm and volume resistivity exceeding 10¹⁶ ohm·cm, the tubing provides exceptional electrical insulation for high-voltage applications up to 30 kV . Its non-stick surface (surface energy <20 dynes/cm) prevents adhesion of contaminants, while the 3:1 shrink ratio ensures a tight, uniform fit around complex shapes, creating an IP68-rated moisture barrier when properly installed .
Category | Specification | Value | Test Method |
Thermal Properties | Continuous Operating Range | -200°C to 200°C | ASTM D638 |
Short-Term Exposure Limit | 260°C (500°F) | ASTM D648 | |
Shrink Temperature Range | 150°C - 200°C | ASTM D2671 | |
Shrink Ratio | 3:1 | ASTM D2671 | |
Mechanical Properties | Tensile Strength | 20 MPa | ASTM D638 |
Elongation at Break | 300% | ASTM D638 | |
Hardness | 55 Shore D | ISO 868 | |
Electrical Properties | Dielectric Strength | 25 kV/mm | ASTM D149 |
Volume Resistivity | >10¹⁶ ohm·cm | IEC 60093 | |
Dielectric Constant (1 MHz) | 2.1 | ASTM D150 | |
Material Properties | Construction | PTFE Inner/FEP Outer | Manufacturer Spec |
Chemical Resistance | Virtually All Chemicals | ASTM D543 | |
Water Absorption | <0.01% | ASTM D570 |
Protects sensors, thermocouples, and electrical connections in chemical reactors and piping systems. Resists corrosion from acids, bases, and organic solvents that would degrade conventional tubing.
Used in sterilization equipment and surgical instruments where high-temperature autoclaving (134°C) and chemical disinfection require inert, non-contaminating materials.
Provides insulation for wiring in aircraft engine compartments and missile guidance systems. Withstands extreme temperature fluctuations and exposure to aviation fuels and hydraulic fluids.
Protects cables and connections in cleanroom environments where exposure to aggressive etchants and high-purity water requires ultra-chemically resistant materials.
While solid PTFE tubing offers excellent chemical resistance, it lacks heat-shrink capabilities and requires complex installation methods . Our double-layer design provides the same chemical resistance through the PTFE inner layer while adding the convenience of heat-shrink installation via the FEP outer layer . This reduces installation time by up to 70% compared to adhesive-bonded PTFE sleeves.
A heat gun or oven capable of reaching 150-200°C is needed to activate the shrink process . The tubing begins shrinking at 150°C and achieves full recovery at 200°C, with typical installation times of 60-90 seconds per section. Unlike pure PTFE tubing, no special adhesives or primers are required for proper bonding to most substrates.
Yes, the tubing is designed for compatibility with automated heat-shrink systems commonly used in cable assembly operations . Its consistent wall thickness and predictable shrink behavior ensure uniform results in high-volume production environments, while its clear FEP outer layer allows visual inspection of underlying components.
Expanded inner diameters range from 2 mm to 50 mm, covering finished diameters from 0.7 mm to 16.7 mm after shrinking at the 3:1 ratio . Standard lengths include 1m, 5m, and 25m spools, with custom cutting services available for specific project requirements. Color options include natural clear and black for light-sensitive applications.
Technical index of polytetrafluoroethylene (PTFE) outer layer
Performance project | representative value | test method |
Melting point | 327℃ | / |
Use temperature | -65-260℃ | / |
Density | 2.15g/cm3 | ASTM D792 |
Tensile strength | 24MPa | ASTM D638 |
Elongation at break | 300% | ASTM D638 |
Fire resistance | VW-1 | UL-224 |
Dielectric constant | 2.1 | ASTM D150 |
Volume resistivity | >1015Ω·cm | ASTM D257 |
Technical index of the inner layer of polyperfluoroethypropene (FEP)
Performance project | representative value | test method |
Melting point | 260-270℃ | / |
Use temperature | -65-200℃ | / |
Density | 2.15g/cm3 | ASTM D792 |
Tensile strength | 20MPa | ASTM D638 |
Elongation at break | 300% | ASTM D638 |
Fire resistance | VW-1 | UL-224 |
Dielectric constant | 2.1 | ASTM D150 |
Volume resistivity | >1015Ω·cm | ASTM D257 |
Specifications | The inner diameter before contraction D（mm) | After contraction the inner diameter D（mm) | Thickness before shrinkage W（mm) | Thickness after shrinkage W（mm) | Packaging length |
Outer layer: Ф 4.0 | 4.0+0.3 | ≤2.1 | 0.20±0.08 | 0.30±0.08 | 1m/pcs |
Inner layer : Ф 3.0 | 3.0±0.1 | Melt | 0.5±0.08 | Melt |
Note: Special sizes and packaging can be customized as required.
In the demanding world of high-performance cable insulation and protection, the Double-Layer PTFE FEP Heat Shrink Tube represents a technological advancement that bridges chemical resistance and ease of installation. This innovative tubing combines a chemically inert PTFE inner layer with a heat-shrinkable FEP outer layer, creating a composite solution that delivers the best properties of both fluoropolymers. Designed for applications where extreme chemical exposure, high temperatures, and reliable insulation are critical, it outperforms single-material alternatives in industries ranging from chemical processing to medical device manufacturing.
The tubing's unique dual-layer construction pairs a PTFE inner layer (polytetrafluoroethylene) with an FEP outer layer (fluorinated ethylene propylene) . PTFE provides exceptional chemical resistance to virtually all industrial solvents, acids, and bases, while FEP offers easier processing with a lower shrink temperature and superior mechanical strength . This combination creates a tube that resists chemical attack from the inside while maintaining structural integrity and easy installation from the outside.
This heat shrink tube operates continuously at -200°C to 200°C (-328°F to 392°F) and withstands short-term exposure up to 260°C (500°F) , making it suitable for cryogenic applications as well as high-heat environments . The PTFE inner layer maintains flexibility at extremely low temperatures, preventing cracking in cold conditions, while the FEP outer layer provides dimensional stability at elevated temperatures.
With a dielectric strength of 25 kV/mm and volume resistivity exceeding 10¹⁶ ohm·cm, the tubing provides exceptional electrical insulation for high-voltage applications up to 30 kV . Its non-stick surface (surface energy <20 dynes/cm) prevents adhesion of contaminants, while the 3:1 shrink ratio ensures a tight, uniform fit around complex shapes, creating an IP68-rated moisture barrier when properly installed .
Category | Specification | Value | Test Method |
Thermal Properties | Continuous Operating Range | -200°C to 200°C | ASTM D638 |
Short-Term Exposure Limit | 260°C (500°F) | ASTM D648 | |
Shrink Temperature Range | 150°C - 200°C | ASTM D2671 | |
Shrink Ratio | 3:1 | ASTM D2671 | |
Mechanical Properties | Tensile Strength | 20 MPa | ASTM D638 |
Elongation at Break | 300% | ASTM D638 | |
Hardness | 55 Shore D | ISO 868 | |
Electrical Properties | Dielectric Strength | 25 kV/mm | ASTM D149 |
Volume Resistivity | >10¹⁶ ohm·cm | IEC 60093 | |
Dielectric Constant (1 MHz) | 2.1 | ASTM D150 | |
Material Properties | Construction | PTFE Inner/FEP Outer | Manufacturer Spec |
Chemical Resistance | Virtually All Chemicals | ASTM D543 | |
Water Absorption | <0.01% | ASTM D570 |
Protects sensors, thermocouples, and electrical connections in chemical reactors and piping systems. Resists corrosion from acids, bases, and organic solvents that would degrade conventional tubing.
Used in sterilization equipment and surgical instruments where high-temperature autoclaving (134°C) and chemical disinfection require inert, non-contaminating materials.
Provides insulation for wiring in aircraft engine compartments and missile guidance systems. Withstands extreme temperature fluctuations and exposure to aviation fuels and hydraulic fluids.
Protects cables and connections in cleanroom environments where exposure to aggressive etchants and high-purity water requires ultra-chemically resistant materials.
While solid PTFE tubing offers excellent chemical resistance, it lacks heat-shrink capabilities and requires complex installation methods . Our double-layer design provides the same chemical resistance through the PTFE inner layer while adding the convenience of heat-shrink installation via the FEP outer layer . This reduces installation time by up to 70% compared to adhesive-bonded PTFE sleeves.
A heat gun or oven capable of reaching 150-200°C is needed to activate the shrink process . The tubing begins shrinking at 150°C and achieves full recovery at 200°C, with typical installation times of 60-90 seconds per section. Unlike pure PTFE tubing, no special adhesives or primers are required for proper bonding to most substrates.
Yes, the tubing is designed for compatibility with automated heat-shrink systems commonly used in cable assembly operations . Its consistent wall thickness and predictable shrink behavior ensure uniform results in high-volume production environments, while its clear FEP outer layer allows visual inspection of underlying components.
Expanded inner diameters range from 2 mm to 50 mm, covering finished diameters from 0.7 mm to 16.7 mm after shrinking at the 3:1 ratio . Standard lengths include 1m, 5m, and 25m spools, with custom cutting services available for specific project requirements. Color options include natural clear and black for light-sensitive applications.
Technical index of polytetrafluoroethylene (PTFE) outer layer
Performance project | representative value | test method |
Melting point | 327℃ | / |
Use temperature | -65-260℃ | / |
Density | 2.15g/cm3 | ASTM D792 |
Tensile strength | 24MPa | ASTM D638 |
Elongation at break | 300% | ASTM D638 |
Fire resistance | VW-1 | UL-224 |
Dielectric constant | 2.1 | ASTM D150 |
Volume resistivity | >1015Ω·cm | ASTM D257 |
Technical index of the inner layer of polyperfluoroethypropene (FEP)
Performance project | representative value | test method |
Melting point | 260-270℃ | / |
Use temperature | -65-200℃ | / |
Density | 2.15g/cm3 | ASTM D792 |
Tensile strength | 20MPa | ASTM D638 |
Elongation at break | 300% | ASTM D638 |
Fire resistance | VW-1 | UL-224 |
Dielectric constant | 2.1 | ASTM D150 |
Volume resistivity | >1015Ω·cm | ASTM D257 |
Specifications | The inner diameter before contraction D（mm) | After contraction the inner diameter D（mm) | Thickness before shrinkage W（mm) | Thickness after shrinkage W（mm) | Packaging length |
Outer layer: Ф 4.0 | 4.0+0.3 | ≤2.1 | 0.20±0.08 | 0.30±0.08 | 1m/pcs |
Inner layer : Ф 3.0 | 3.0±0.1 | Melt | 0.5±0.08 | Melt |
Note: Special sizes and packaging can be customized as required.
