PTFE  Gasket/ PTFE Filled  Gasket

Ⅰ、Features

   PTFE envelope gasket is a kind of static seals.It is composed of elastic materials such as compressed asbestos sheet,rubber,ceramics,etc. And PTFE envelope cover.

   PTFE has superior properties against chemical(not affected by all chemicals except molten alkali metal and fluorine at elevated temperature) and temperature(from - 180℃ ~ +250℃）The coefficient of static and dynamic friction of PTFE are every low.PTFE is the best of the “non-stick”material. It has excellent anti weathering and aging characteristics.

Ⅱ、Types and Specifications:

PTFE Envelope Gasket

Note: （Thickness）Gasket slot width

PTFE Flange Gasket

Different standards of different specifications gasket, according to customer drawings for processing

Ⅲ、Applications

PTFE envelope gasket is used to seal pipe flange anti joint of industrial machinery apparatus which is lined with rubber,plastic ceramics graphite etc.

PTFE Spiral Wound Gasket Technical Description

PTFE spiral wound gaskets are metal-nonmetal composite sealing elements manufactured through a specialized process, formed by alternately winding PTFE tape with metal骨架材料. This innovative structural design perfectly combines the exceptional chemical stability of PTFE with the superior mechanical properties of metal materials, making it a key solution in modern industrial sealing.

Product Core Advantages

1. Exceptional Sealing Performance

   · Withstands working pressures up to 26 MPa (Enhanced Type)

   · Adapts to various flange surface roughnesses (Ra ≤ 6.3 μm)

   · Extremely low leakage rate (< 1×10⁻⁶ mbar·L/s)

2. Broad Operating Condition Adaptability

   · Ultra-wide temperature range (-196°C to +260°C)

   · Resists corrosive media like strong acids and alkalis

   · Excellent creep resistance (< 0.8% deformation at 260°C)

3. Diverse Structural Options

   · Offers Basic, Enhanced, Inner Ring types, among others

   · Optional metal winding strip materials (304SS/316LSS/Titanium alloy, etc.)

   · Optional special surface treatments (Electropolishing/Plasma treatment, etc.)

Typical Application Fields

· Petrochemicals: Hydrogenation units, acid gas treatment systems

· Power Energy: Nuclear main pumps, steam turbine seals

· Pharmaceutical/Food: Bioreactors, sterile piping systems

· Aerospace/Military: Propellant transfer systems, cryogenic storage tanks

Technological Innovation Highlights

· Smart Preload Technology: Integrates shape memory alloys for automatic sealing force adjustment

· Nano Surface Treatment: Significantly reduces friction coefficient (≤ 0.02)

· Eco-Design: Utilizes recyclable metal winding strip structure (Recycling rate > 95%)

Quality Certification System

This product series has passed:

· API 6A (Oil and Gas Equipment)

· PED 2014/68/EU (Pressure Equipment)

· FDA 21 CFR 177.1550 (Food & Pharmaceutical)

· RCC-M (Nuclear Power Equipment) and other international certifications

Selection Advice

Select the appropriate model based on specific operating conditions (pressure, temperature, medium, etc.). Customized solutions are available for special conditions. The newly developed graphene-modified model achieves a thermal conductivity of 18 W/(m·K), meeting special heat dissipation requirements.

Note: Product performance data is based on standard test conditions. For practical applications, consult professional technical personnel for selection confirmation.

Basic Performance Parameters

Parameter Item	Basic Type	Enhanced Type	Inner Ring Type	Test Standard
Structure Composition	PTFE+304SS	PTFE+316LSS	PTFE+Inner Ring	ASME B16.20
Operating Temp. (°C)	-196 ~ +260	-196 ~ +300	-196 ~ +260	ASTM D696
Rated Pressure (MPa)	10	26	15	EN 13555
Compression Rate (%)	18-25	15-20	20-28	DIN 28090
ecovery Rate (%)	≥ 17	≥ 20	≥ 15	ASTM F36
Tape Thickness (mm)	0.3-0.5	0.4-0.6	0.3-0.5	ISO 13000
Metal Strip Profile	V-shape	W-shape	Flat Type	DIN 2690

Physical Characteristics Comparison

Characteristic	Basic Type	Enhanced Type	Improvement Effect
Tensile Strength (MPa)	60-80	90-120	50% ↑
Thermal Deformation (@260°C)	< 2%	< 0.8%	150% ↓
Min. Gasket Stress (MPa)	40	70	75%↑
Fatigue Life (cycles)	50,000	100,000	100% ↑
Permeability (mbar·L/s)	1×10⁻⁶	1×10⁻⁷	10x ↓

Dimension Parameter Table

Nominal Diameter DN	ID (mm)	OD (mm)	Basic Type Thickness (mm)	Enhanced Type Thickness (mm)
50	54	102	3.2	4.5
100	108	158	3.5	5.0
300	325	370	4.2	6.0
600	620	685	5.0	7.5
1000	1025	1100	6.0	9.0

Certification Standards List

Certification Type	Certification Standard	Applicable Models	Certifying Body
Oil & Gas	API 6A	Enhanced Series	API
Pressure Equipment	PED 2014/68/EU	Full Series	TÜV
Semiconductor	SEMI F57	Ultra-Pure Type	SEMI
Nuclear Power	RCC-M	Nuclear Special Type	AFCEN
Food & Pharmaceutical	FDA 21 CFR 177.1550	Pharmaceutical Grade	US FDA

Selection Reference Guide

Operating Requirement	Recommended Model	Key Advantage
Strong Acid + High Pressure (≤26 MPa)	316LSS Enhanced Type	Resists Intergranular Corrosion
Cryogenic (-196°C)	Titanium Alloy Strip Type	Excellent Cryogenic Toughness
Frequent Disassembly	Graphite Filled Type	Good Self-lubricating Properties
Nuclear Radiation Environment	Inconel Strip Type	Radiation Resistance Dose > 10⁶ Gy
Food & Pharmaceutical	Electropolished Pharmaceutical Grade	Ra ≤ 0.8 μm

Innovative Technology Parameters

Technology Name	Technical Indicator	Commercial Application Stage
Shape Memory Alloy Ring	Temp. Response Sensitivity ±2°C	Mass Production
Nano-textured Surface	Contact Angle > 150°	Contact Angle > 150°
Quantum Dot Marking	Leak Detection Sensitivity 0.01 mm²	Laboratory Stage
Self-healing Coating	Repairs Cracks ≤ 0.2 mm	Pilot Stage
4D Printed Winding Core Mold	Forming Accuracy ± 0.05 mm	R&D Stage

Typical Application Scenarios

Industry	Typical Equipment	Special Requirements
Petrochemical	Hydrogenation Reactor	H₂S Corrosion Resistance
Power Energy	Nuclear Main Pump	Radiation Resistance 10⁶ Gy
Pharmaceutical/Food	Fermentation Tank	FDA Certification
Aerospace/Military	Rocket Fuel System	-196°C Sealing

Structure Type Comparison

Type	Structural Feature	Pressure Rating	Applicable Standard
Basic Type	V-shape Metal Strip + PTFE	≤ 10 MPa	ASME B16.20
Enhanced Type	W-shape Metal Strip + Graphite Filled	≤ 26 MPa	EN 1514-1
Inner Ring Type	Metal Inner Ring Reinforcement	≤ 15 MPa	DIN 2690
Teflon Composite Type	PTFE + PFA Composite Tape	≤ 6 MPa	SEMI F57

Innovative Technology Highlights

1. Smart Preload Technology

   · Integrated Shape Memory Alloy Ring

   · Automatically increases sealing force by 15% per 100°C temperature rise

2. Super Surface Treatment

   · Plasma Nano-texturing (Contact Angle > 150°)

   · Friction coefficient reduced to 0.02

3. Environmental Breakthrough

   · Recyclable Metal Strip Design (Recycling Rate > 95%)

   · Fluorine-free Eco-friendly Coating Under Development (Experimental Stage)

Current Technology Frontiers:

· 4D Printed Winding Core Molds: Enable complex asymmetric structure forming

· Quantum Dot Marking Technology: Rapid leak point localization

· Self-healing Coatings: Automatic repair of micro-cracks (< 0.2 mm)

This product series has passed 17 international certifications including API 6A and PED 2014/68/EU, with successful application cases in extreme environments such as deep-sea oil fields (3000m water pressure) and space station liquid oxygen systems. The newly released "Zero Leakage 2.0" technical solution enables a 15-year maintenance-free seal life.