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PTFE Expansion Tape

Publisher：Hansa seal Pubtime：2026-01-19 13:53:00 Close
 PTFE Expansion Tape Product Introduction
PTFE expansion tape is an expandable sealing material made from pure PTFE as the base material through special processing. Its unique thermal expansion characteristic makes it an ideal sealing solution for high-temperature and high-pressure conditions.
Core Features
· Intelligent Expansion: Begins expanding at 150°C, with a maximum expansion rate of up to 200%.
· Superior Temperature Resistance: Stable long-term operation from -200°C to +260°C.
· Dual Sealing Mechanism: Combines mechanical compression sealing and thermal expansion sealing.
· Safe & Eco-Friendly: Asbestos-free, FDA certified (21 CFR 177.1550).
Product Advantages
· Emergency Sealing: Automatically compensates for seal gaps when temperature rises.
· Easy Installation: Can be directly wound without pre-forming.
· Long-lasting Stability: Service life of 3-5 years at 260°C.
· High Versatility: Suitable for irregular sealing surfaces.
Typical Applications
· Industrial Sealing:
   Emergency sealing for high-temperature flanges (sudden leaks)
   Supplemental sealing for valve stuffing boxes
· Energy Equipment:
   Compensation sealing for steam pipelines
   Maintenance sealing for heat exchangers
· Specialized Fields:
   Pipeline sealing in nuclear power plants (RCC-M certified)
   Fuel line sealing for spacecraft
Usage Guide
1. Installation Steps:
   · Clean sealing surface (Ra ≤ 3.2μm)
   · Spiral winding (50% overlap)
   · Initial tightening force of 10-15 N/mm²
2. Activation Conditions:
   · Minimum activation temperature: 150°C
   · Optimal activation range: 180-220°C
   · Full expansion time: 30-60 minutes
3. Maintenance Recommendations:
   · Check expansion state annually
   · Re-tighten during system shutdown
   · Do not reuse more than 3 times
Quality Certifications
· API 6A (Petroleum Equipment Certification)
· ISO 9001 Quality Management System
· PED 2014/68/EU (Pressure Equipment Directive)
· ASME B16.20 (Pipe Flange Gaskets)
Selection Advice
· Standard Sealing: Choose 1.0 mm thick standard type.
· High-Pressure Conditions: Recommend 1.5 mm reinforced type.
· Rapid Emergency Response: Choose low-temperature activation type (starts at 120°C).
· Nuclear Applications: Specify special type with barrier layer.
Important Notes:
1. Reserve 20% compression allowance during installation.
2. Do not allow direct contact with strong oxidizing agents.
3. Pre-high-temperature devolatilization treatment required for food-grade applications.
4. Cannot be disassembled in reverse after expansion.
This product has been successfully applied in:
· High-temperature oil pumps in a refinery (380°C/5 MPa conditions)
· Main steam isolation valves in nuclear power plants (RCC-M nuclear-grade certified)
· Space station fluid pipeline systems (NASA standard)

Specification Parameters

 Parameter Standard Specifications    Special Customization
 Width   10 mm/15 mm/20 mm   5-50 mm
 Length  5 m/10 m/20 m per roll  5 m/10 m/20 m per roll
 Expansion Pressure  0.5-3.0 MPa   Adjustable expansion formula
 Color  White (Standard)  Red (High-Temp Warning)



Detailed Technical Parameters of PTFE Expansion Tape

 Item  Parameter Range / Description  Test Standard
 Chemical Composition  Chemical Composition  ASTM D4894
 Density  2.14 - 2.20 g/cm³  ISO 1183
 Tensile Strength  Longitudinal ≥15 MPa, Transverse ≥10 MPa  ASTM D638
 Elongation at Break  200 - 400%  ASTM D638
 Dielectric Constant  1.8 - 2.2 (1MHz)  ASTM D150
 Volume Resistivity  ASTM D150 ASTM D257 
 Coefficient of Friction  0.05 - 0.10 (dynamic, steel vs. PTFE)  ASTM D1894
 Thermal Expansion Coefficient  0.05 - 0.10 (dynamic, steel vs. PTFE)  ASTM E831
 Flammability  Non-flammable (Oxygen Index ≥95%)  ASTM D2863

In-depth Specification and Selection Comparison Table

 Specification Parameter Ultra-thin Type (Precision)  Standard Type  Thickened Type (High Pressure)  Wide-width Type (Large Diameter) 
 Thickness (mm)  0.04 - 0.07  0.08 - 0.12  0.15 - 0.30  0.10 - 0.15
 Width (mm)  12  19, 25  0.15 - 0.30  0.10 - 0.15
 Applicable Pressure (MPa)  ≤5  ≤16  ≤40  ≤16
 Applicable Temp. (°C)  -100 ~ +200  -200 ~ +260  -200 ~ +300  -200 ~ +260
 Typical Application  Instrument tubing, electronic components  -200 ~ +260  High-pressure water/gas pipes  Chemical large-diameter flanges

Special Media Compatibility Table

 Media Type  Tape Selection Requirement  Prohibited Scenarios
 Prohibited Scenarios  Grease-free grade (pink), residual grease ≤0.1mg/m²  Ordinary white tape
 Ordinary white tape  Pure PTFE without additives, thickness ≥0.15mm  Graphite-modified type
 Food / Pharmaceutical  FDA certified, heavy metal content ≤0.005%  Industrial general-purpose type
 Cryogenic (LNG)  Low-temperature toughened for -200°C, no cracking risk  Recycled material tape

Application Field Classification Table

 Industry Specific Application Scenarios   Special Requirements
 Petroleum & Chemical  Reactor flange sealing, corrosive media pipelines (e.g., sulfuric acid, hydrochloric acid)  High pressure resistance (≥10MPa), stress corrosion resistance
 Food & Pharmaceutical  Sterile pipelines, fermenter threaded connections  FDA certification, non-leachable
 Energy & Power  Steam turbine piping, nuclear plant cooling systems  Radiation resistance, high-temp resistance (300°C short-term)
 Semiconductor  High-purity gas delivery (e.g., silane, helium)  Dust-free & oil-free, ESD protective
 Aerospace  Hydraulic systems, fuel lines  MIL-STD-27730A standard
 Civil Construction  HVAC, gas inlet pipes  Flame retardancy (UL94 V-0)

Detailed Physical Property Parameters Table

 Performance Indicator  Test Conditions  Typical Value Unit   Test Standard
 Density  23°C  2.15 - 2.20  g/cm³  ISO 1183
 Tensile Strength  23°C, 50mm/min  15 - 30  MPa  ASTM D638
 Elongation at Break  23°C  200 - 400  %  ASTM D638
 Compression Set  10MPa, 24h, 23°C  ≤15  %  ASTM D395
 Thermal Conductivity  100°C  0.24 - 0.28  W/(m·K)  ASTM E1461
 Linear Expansion Coeff.  20-100°C  12 × 10⁻⁵  /°C  ASTM E1461
 Coefficient of Friction  Steel vs. PTFE, 0.5 m/s  0.05 - 0.08  -  ASTM D1894

Chemical Resistance Performance Table

 Chemical Media  Concentration  Resistance (23°C)  Max. Tolerated Temp. Failure Manifestation 
 Sulfuric Acid  98%  Excellent 200°C   Decomposes above 260°C producing HF
 Sodium Hydroxide  50%  Good (≤100°C)  80°C  Permeation and swelling at high temps
 Acetone  100%  Excellent  100°C  Slight swelling above 150°C
 PTFE High-Temperature Fabric (PTFE Fabric)
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