Introduction to Fiberglass Gaskets

Fiberglass gaskets are sealing gaskets made primarily from glass fiber as the reinforcing material, compounded with a resin matrix. They offer excellent high-temperature resistance, corrosion resistance, and mechanical strength, making them an ideal sealing solution for medium to high-temperature working conditions.

 

 Core Characteristics

Characteristic	Description	Advantages
Excellent High-Temperature Resistance	Long-term service temperature up to 550°C	Suitable for medium to high-temperature conditions
Good Corrosion Resistance	Resistant to most acids, alkalis, and organic solvents	Suitable for corrosive media
High Mechanical Strength	Excellent compressive and tensile properties	Can withstand high sealing pressures
Low Thermal Conductivity	Low thermal conductivity, good insulation performance	Suitable for high-temperature equipment sealing
Good Insulation Properties	Excellent electrical insulation performance	Suitable for electrical equipment sealing

 

 Material Composition

Component	Material Type	Function
Function	Alkali-free glass fiber cloth	Provides mechanical strength and temperature resistance
Matrix Material	Silicone rubber, fluoroelastomer, etc.	Provides sealing and flexibility
Filler Material	Graphite, mica, etc.	Improves temperature resistance or sealing performance

 

Performance Parameters Table

Performance Indicator	Silicone Fiberglass Gasket	Fluoroelastomer Fiberglass Gasket	Test Standard
Operating Temperature (°C)	-60~300	-20~400	ASTM D2000
Tensile Strength (MPa)	≥20	≥25	ASTM D638
Compression Rate (%)	10~20	8~15	ASTM F36
Recovery Rate (%)	≥40	≥35	ASTM F36
Density (g/cm3)	1.8~2.2	2.0~2.5	ASTM D792

Type Classification

Type	Structural Features	Applications
Full Fiberglass Type	Pure glass fiber material	High-temperature insulation sealing
Rubber Composite Type	Fiberglass and rubber composite	Sealing requiring elasticity
Graphite Composite Type	Fiberglass and graphite composite	High-temperature and high-pressure sealing
Metal Reinforced Type	Fiberglass and metal composite	Ultra-high strength sealing

Selection Guide

1. Working Condition Analysis:

   · Operating temperature and pressure

   · Media corrosiveness

   · Sealing requirement level

2. Material Selection:

   · Use silicone-based for medium-temperature environments

   · Use fluoroelastomer-based for high-temperature environments

   · Use special resins for specific media

3. Size Determination:

   · Select according to flange standards

   · Consider thermal expansion factors

   · Reserve appropriate compression amount

 

Installation and Usage Requirements

1. Pre-Installation Preparation:

   · Check sealing surface finish (Ra ≤ 3.2 μm)

   · Remove impurities from sealing surfaces

   · Measure flange parallelism

2. Installation Specifications:

   · Use a torque wrench

   · Tighten in diagonal sequence

   · Control compression amount (15-25%)

3. Usage Precautions:

   · Avoid impact and vibration

   · Regularly check tightness status

   · Note the effects of sudden temperature changes

Application Fields

1. Petrochemical Industry: Reactors, cracking furnaces, high-temperature pipelines

2. Power Equipment: Steam turbines, boilers, heat exchangers

3. Aerospace: Engines, combustion chamber sealing

4. Automotive Industry: Exhaust systems, turbochargers

5. Industrial Furnaces: Heat treatment equipment, smelting furnaces

Special Treatments

1. Surface Treatments:

   · Graphite coating treatment

   · PTFE impregnation treatment

   · Anti-stick treatment

2. Reinforcement Treatments:

   · Metal mesh reinforcement

   · Carbon fiber reinforcement

   · Ceramic fiber reinforcement

3. Modification Treatments:

   · Improve flexibility

   · Enhance sealing performance

   · Increase corrosion resistance

 

Fiberglass gaskets, with their excellent temperature resistance, corrosion resistance, and mechanical strength, are important sealing materials for medium to high-temperature working conditions. Through proper material selection and correct installation, they can provide reliable sealing protection for industries such as petrochemicals and power equipment. Understanding their characteristics and selecting the right type is key to ensuring sealing effectiveness.