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-Rubber Composite Gasket Technical Description

PTFE-Rubber composite gaskets are innovative sealing materials created by perfectly bonding a Polytetrafluoroethylene (PTFE) film to a high-performance rubber substrate through a special process. This product combines the excellent chemical inertness of PTFE with the good elasticity of rubber materials, offering a novel solution for modern industrial sealing.

Product Core Characteristics

1. Dual Material Advantages

   · PTFE surface layer provides exceptional corrosion resistance, tolerating strong corrosive media like 98% concentrated sulfuric acid and 37% hydrochloric acid.

   · Rubber base layer ensures excellent compression recovery (Recovery Rate ≥ 25%), effectively compensating for flange unevenness.

2. Exceptional Sealing Performance

   · Working Pressure Range: 0.6 - 4.0 MPa

   · Operating Temperature: -40°C ~ +150°C (short-term up to 180°C)

   · Instant sealing effect, no need to wait for creep recovery after installation.

3. Significant Economic Benefits

   · 40% cost reduction compared to pure PTFE gaskets.

   · Installation torque only 35 N·m, a 42% reduction.

   · Service life extended by 2-3 times.

Typical Application Fields

· Petrochemicals: Pump/Valve flanges, heat exchanger seals.

· Food/Pharmaceutical: Filling equipment, bioreactors (FDA certified).

· Automotive Manufacturing: New energy battery cooling system seals.

· Water Treatment: Seawater desalination equipment, wastewater treatment units.

Technological Innovation Highlights

· Laser Micro-perforation Anchoring Technology: PTFE-to-rubber bond strength ≥ 8 N/mm.

· Smart Sensing Series: Optional pressure-sensing labels for real-time seal status monitoring.

· Eco-Design: Recyclable material content > 90%, compliant with RoHS standards.

Quality Assurance

Products are certified under the ISO 9001 Quality Management System and offer the following professional certifications:

· Food Grade: FDA 21 CFR 177.1550

· Drinking Water: NSF/ANSI 61

· Automotive Industry: IATF 16949

Selection Advice

This product offers various specifications including Standard Type (NBR core), Acid-Resistant Type (EPDM core), and Food Grade (Silicone core). Selection can be based on medium characteristics, operating temperature, and pressure conditions. The newly launched graphene-modified series achieves a thermal conductivity of 5.8 W/(m·K), suitable for scenarios with special heat dissipation requirements.

Note: Product sizes cover the full range from DN15 to DN2000. A professional technical team provides selection support and customization services. For practical applications, verification testing based on specific operating parameters is recommended.

Basic Performance Parameters

Parameter Item	Standard Type (NBR Core)	Acid-Resistant Type (EPDM Core)	Food Grade (Silicone Core)	Test Standard
Operating Temp. (°C)	-40 ~ +150	-30 ~ +180	-50 ~ +200	ASTM D2000
Rated Pressure (MPa)	2.5	4.0	1.6	EN 1514-1
Compression Rate (%)	20 ±5	18 ±4	25 ±5	DIN 28090
Recovery Rate (%)	≥ 25	≥ 28	≥ 30	ASTM F36
PTFE Thickness (mm)	0.2 ~ 0.3	0.3 ~ 0.5	0.1 ~ 0.2	0.1 ~ 0.2
Surface Roughness Ra (μm)	≤ 3.2	≤ 3.2	≤ 0.8	ISO 4287

Dimension Specification Table

Nominal Diameter DN	ID (mm)	OD (mm)	Standard Thickness (mm)
15	16.5	54	1.5 / 2.0
50	53	102	2.0 / 3.0
100	104	158	2.5 / 3.5
300	306	370	3.0 / 4.5
600	610	685	4.0 / 6.1

Certification Standards List

Certification Type	Certification Standard	Applicable Models
Industrial General	ISO 9001	Full Series
Food Grade	FDA 21 CFR 177.1550	Food Grade
Automotive Industry	IATF 16949	Standard / Acid-Resistant Type
Environmental	RoHS 2.0	Full Series
Drinking Water	NSF/ANSI 61	Food Grade

Selection Reference Guide

Operating Condition Characteristics	Recommended Model	Core Advantage
Oil Media + Medium Temperature	Standard Type (NBR Core)	Excellent Oil Resistance
Strong Acid/Alkali Environment	Acid-Resistant Type (EPDM Core)	Comprehensive Chemical Corrosion Resistance
Ultra-high Cleanliness Requirements	Food Grade (Silicone Core)	Ultra-smooth Surface (Ra ≤ 0.8 μm)
Anti-static Requirements	Conductive Type (CR Core)	Controllable Surface Resistance
Frequent Disassembly Conditions	Super Elastic Type (FKM Core)	Strong Anti-permanent Deformation Ability

Innovative Technology Parameters

Technology Name	Technical Indicator	Application Status
Laser Micro-perforation Anchoring	Peel Strength ≥ 8 N/mm	Mass Production
Graphene Modified PTFE	Thermal Conductivity 5.8 W/(m·K)	Small Batch Production
Biodegradable Rubber	Degradation Rate 65%/year under Compost Conditions	R&D Stage
Smart Sensing Technology	Pressure Monitoring Accuracy ± 0.1 MPa	Optional Configuration

Technical Parameters

Item	Parameter
Compression Rate	15 - 30%
Peel Strength	≥ 3.5 N/mm
Surface Roughness Ra	≤ 3.2 μm (Food Grade 0.8 μm)
Instant Sealing Performance	Effective Immediately After Installation

Material Combination Schemes

· Standard Type: PTFE + NBR (Good Oil Resistance)

· Acid-Resistant Type: PTFE + EPDM (Acid/Alkali Resistant)

· Food Grade: PTFE + Silicone (FDA Certified)

· Conductive Type: PTFE + CR (Surface Resistance 10⁴ - 10⁶ Ω)

Typical Applications

· Chemical Pipeline Flange Seals

· Food/Pharmaceutical Equipment Connections

· Automotive Manufacturing Sealing Systems

· Water Treatment Equipment Interfaces

Quality Certifications

· ISO 9001 Quality Management System

· FDA 21 CFR 177.1550

· RoHS 2.0 Environmental Certification

· NSF/ANSI 61 Drinking Water Standard

Selection Advice Summary

Select the appropriate material combination based on medium characteristics. Custom services are available for special operating conditions. The latest graphene-modified series (Thermal Conductivity 5.8 W/(m·K)) has entered small-batch production.