Features:

Because  of  its  high  corrosion  resistance,  stable  physical  properties,  high  temperature, the  achievements of  its  good sealing  performance,  in the  petroleum, chemical,  pharmaceutical,  power, steel  industry  has  a wide range of applications. Suitable  media  include water, oil,  acid  solution,  alkaline  solution  and  almost  any  chemical  ingredients.

Introduction to PTFE Gaskets

PTFE gaskets are sealing gaskets made primarily from polytetrafluoroethylene (PTFE). They offer excellent chemical stability, temperature resistance, and low friction characteristics, making them an ideal sealing solution for demanding working conditions.

 Core Characteristics

Characteristic	Description	Advantages
Excellent Chemical Inertness	Resistant to all strong acids, alkalis, and organic solvents	Suitable for extreme chemical environments
Wide Temperature Range	Continuous use from -200°C to +260°C	Ideal for alternating high and low-temperature conditions
Extremely Low Friction Coefficient	Dynamic friction coefficient of only 0.04-0.07	Suitable for frequently disassembled applications
Non-Stick Properties	Very low surface energy, does not adhere to any substance	Easy to clean, excellent anti-fouling properties
Excellent Electrical Insulation	Dielectric strength up to 100-200 kV/mm	Suitable for electrical insulation applications

 Manufacturing Processes

Process Type	Characteristics	Applicable Products
Compression Molding	High dimensional accuracy, good density	Standard specification gaskets
Machining	Flexible processing, can produce large-size gaskets	Custom non-standard gaskets
Extrusion Molding	High production efficiency, low cost	Pipe and rod gaskets

Performance Parameters Table

Performance Indicator	Value Range	Test Standard
Density (g/cm3)	2.1-2.3	ASTM D792
Tensile Strength (MPa)	20-40	ASTM D638
Elongation at Break (%)	200-400	ASTM D638
Compression Rate (%)	5-15	ASTM F36
Recovery Rate (%)	Recovery Rate (%)	ASTM F36

Type Classification

Type	Structural Features	Applications
Pure PTFE Gaskets	100%	polytetrafluoroethylene Sealing strongly corrosive media
Filled PTFE Gaskets	Filled PTFE Gaskets	Improved wear and thermal conductivity
Expanded PTFE Gaskets	Microporous structure, soft and compressible	Irregular sealing surfaces
Composite PTFE Gaskets	Combined with other materials	Special performance requirements

Selection Guide

1. Working Condition Analysis:

   · Chemical properties of the medium

   · Temperature and pressure range

   · Sealing surface condition

2. Material Selection:

   · Use pure PTFE for strongly corrosive environments

   · Use filled PTFE for wear resistance requirements

   · Use expanded PTFE for irregular sealing surfaces

3. Size Determination:

   · Select according to flange standards

   · Consider bolt load

   · Reserve appropriate compression amount

 Installation and Usage Requirements

1. Pre-Installation Inspection:

   · Confirm gasket specifications and materials

   · Check sealing surface finish (Ra ≤ 3.2 μm)

   · Remove impurities from sealing surfaces

2. Installation Specifications:

   · Use a torque wrench

   · Tighten in diagonal sequence

   · Control compression amount (20-30%)

3. Usage Precautions:

   · Avoid over-compression

   · Regularly check tightness status

   · Note the effects of temperature changes

Application Fields

1. Chemical Equipment: Reactors, storage tanks, pipeline flanges

2. Pharmaceutical Industry: Clean pipeline systems, bioreactors

3. Food Processing: Food-grade equipment sealing

4. Electronics and Electrical: High-purity chemical delivery systems

5. Aerospace: Fuel systems, hydraulic systems

Special Treatments

1. Reinforcement Treatments:

   · Glass fiber reinforcement

   · Carbon fiber reinforcement

   · Bronze filled reinforcement

2. Modification Treatments:

   · Improved creep resistance

   · Enhanced wear resistance

   · Improved thermal conductivity

3. Surface Treatments:

   · Surface activation treatment

   · Anti-stick treatment

   · Conductive treatment

PTFE gaskets, with their unique chemical inertness, wide temperature adaptation range, and excellent dielectric properties, are the preferred sealing material for strongly corrosive working conditions. Although they have limitations such as cold flow and poor wear resistance, reasonable structural design and correct usage methods can fully leverage their performance advantages, providing reliable sealing solutions for industries such as chemicals, pharmaceuticals, and food processing.