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 Fiberglass Gasket Technical Introduction

PTFE fiberglass gaskets are high-performance sealing materials composed of polytetrafluoroethylene (PTFE) compounded with high-strength glass fibers. Through special processes, the glass fiber mesh is fully encapsulated within the PTFE matrix, forming a "sandwich" structure that combines both chemical inertness and mechanical strength. This product perfectly addresses the shortcomings of traditional PTFE gaskets, such as susceptibility to creep and poor pressure resistance, and has become the preferred sealing solution in demanding conditions within the chemical, energy, and other industries.

Core Value Proposition

1. Breakthrough Mechanical Performance

   · Tensile strength reaches 45-60 MPa, three times that of pure PTFE gaskets.

   · Creep resistance improved by 5 times (<1% deformation at 200°C).

   · Bolt stress retention >90% (5000-hour test).

2. Comprehensive Chemical Protection

   · Resists highly corrosive media like 98% sulfuric acid and 37% hydrochloric acid.

   · Certified per NACE MR0175 for sour service environments.

   · Metal ion leachables <0.1 ppm (semiconductor grade).

3. Intelligent Upgrade Options

   · Optional embedded pressure-sensing fibers (monitoring accuracy ±0.1 MPa).

   · Conductive version with adjustable surface resistance (10³-10⁶ Ω).

Technology Evolution Milestones

· Third-generation products use supercritical fluid impregnation technology, increasing the glass fiber-PTFE bond strength by 200%.

· Nano-ceramic modified versions break the 10 MPa pressure resistance barrier.

· Self-healing gaskets can automatically repair mechanical damage within 0.3 mm.

Typical Application Scenarios

· Chemical Industry: Sulfuric acid concentration units, chlor-alkali electrolyzers.

· Energy Equipment: LNG cryogenic pump seals, nuclear power primary circuits.

· Electronics Manufacturing: Wafer etching equipment, LCD panel production lines.

· Special Vessels: Seawater desalination systems, SCR denitrification units.

Current Technology Frontiers:

· 4D Printed Smart Gaskets: Temperature-responsive automatic sealing force adjustment.

· Graphene Reinforced Type: Thermal conductivity up to 15 W/(m·K) for heat-dissipating sealing solutions.

· Biodegradable Type: 60% biodegradable PTFE composite materials (experimental stage).

This product series achieves full size coverage from DN15 to DN3000, has passed 23 international certifications including ASME and PED, and holds a market share exceeding 65% among the global top 50 petrochemical companies. The latest released "Zero Leakage Commitment" technical white paper indicates a maintenance-free seal life of 10 years under correct selection and installation conditions.

Core Performance Parameters

Performance Indicator	Parameter Range	Test Standard
Operating Temperature	-100°C ~ +260°C	ASTM D5740
Max. Working Pressure	8.0 MPa (with metal core type)	EN 13555
Compression Rate	12-18%	DIN 28090-2
DIN 28090-2	≥ 13%	ASTM F36
Glass Fiber Content	25-35 wt%	25-35 wt%

Basic Performance Parameters

Item	Standard  Type	High-Pressure Conductive Type Test	xonductive Type	Test Standard
Material Composition	PTFE+25% GF	PTFE+35% GF+SS Core	PTFE+30% GF+10%	CF ISO 13000
Thickness Range (mm)	1.5-6.0	2.0-8.0	1.8-5.0	DIN 28090
Operating Temp. (°C)	-100 ~ +260	-80 ~ +280	-100 ~ +250	ASTM D696
Max. Pressure (MPa)	4.0	8.0	5.0	EN 13555
Compression Rate (%)	15 ±3	12 ±2	14 ±2	ASTM F36
Recovery Rate (%)	≥ 13	≥ 15	≥ 12	ASTM F36
Density (g/cm³)	2.15-2.35	2.40-2.60	2.20-2.45	ISO 1183

Specification Parameter Comparison

Nominal Diameter DN	Gasket ID (mm)	Gasket OD (mm)	Standard Thickness (mm)	High-Pressure Thickness (mm)
25	26.5	54	1.5 /3.0	2.0 / 4.0
50	53	102	2.0/3.0	3.0 / 5.0
100	104	158	2.5 / 4.0	4.0 / 6.0
300	306	370	3.0 / 5.0	5.0 / 8.0
600	610	685	4.0 / 6.0	6.0 / 10.0

Certification Standards List

Certification Type	Certification Standard	Applicable Models	Certifying Body
Industrial General	ISO 9001	Full Series	SGS
Food Grade	FDA 21 CFR 177.1550	BioClean Series	US FDA
Semiconductor	SEMI F57	Ultra-Pure Series	SEMI
Explosion-proof	ATEX 2014/34/EU	Conductive Type TÜV	TÜV
Nuclear Power	RCC-M	Nuclear-Grade	AFCEN

Technical Advantage Comparison

Characteristic	Traditional PTFE Gasket	PTFE Fiberglass Gasket	Improvement
Creep Resistance	Poor (>5% deformation)	Excellent (<1% deformation)	500% ↑
Cold Flow Resistance	Starts flowing at 40°C	Maintains shape up to 120°C	Temp. threshold ↑ 200%
Bolt Load Retention	Requires frequent retightening	Requires frequent retightening	Maintenance cost ↓ 70%
Pressure Resistance	≤ 2.5 MPa	≤ 8.0 MPa	320% ↑

Innovative Process Breakthroughs

1. Gradient Impregnation Technology

   Uses supercritical CO₂ to penetrate PTFE into the glass fiber mesh (penetration depth ≥95%), increasing interfacial bond strength by 3 times.

2. Surface Functionalization Treatment

   · Corona Treatment: Surface energy reaches 50 dyn/cm (original 38 dyn/cm).

   · Laser Micro-texturing: Friction coefficient reduced to 0.03.

3. Intelligent Composite Technology

   Embedded carbon nanotube sensor network (optional) for real-time monitoring of:

   · Sealing surface pressure distribution (accuracy ±0.1 MPa).

   · Temperature gradient changes (resolution 0.5°C).

Industry Customized Solutions

Industry	Special Model	Special Treatment	Certification Standard
Chemical	HF-Resist Type	Special surface passivation for HF acid	NACE MR0175
Pharmaceutical	BioClean Grade	Electropolished surface (Ra ≤ 0.6 μm)	FDA 21 CFR 177.1550
Semiconductor	Ultra-Pure Type	Metal ion content < 0.05 ppb	SEMI F57
Nuclear Power	Nuclear-Grade	Radiation resistance dose 10⁶ Gy	RCC-M Standard

Selection Guide

1. Low-pressure corrosive environment (≤ 2.5 MPa)

   → Choose Standard Fiberglass Reinforced Type (Thickness 1.5-3 mm)

2. High-pressure dynamic sealing (≤ 8 MPa)

   → Choose 304SS Internal Core Reinforced Type

3. Extreme temperature fluctuations (-100 ~ 260°C)

   → Specify Graphite Modified Fiberglass Composite Type

4. Anti-static requirements

   → Choose Carbon Fiber Blended Fiberglass Type (Surface Resistance 10⁴ Ω)