Silicone coated fabric and PTFE coated fabric are two commonly used coated fiberglass materials for high-temperature industrial applications. Both use woven fiberglass cloth as the reinforcing base, but their different surface coatings give them distinct performance characteristics.

Silicone coated fabric is valued for its flexibility, weather resistance and mechanical durability, while PTFE coated fabric is especially suitable for applications requiring a non-stick surface, low friction and strong chemical resistance.

This article compares their properties, applications and selection factors to help you choose the right coated fiberglass fabric for your project.

What Is Silicone Coated Fabric?

Silicone coated fiberglass fabric is manufactured by coating one or both sides of woven fiberglass cloth with silicone rubber.

The fiberglass substrate provides strength, dimensional stability and heat resistance. The silicone coating improves flexibility, weather resistance, surface protection and resistance to water, oils and abrasion.

Silicone coated fabric is commonly used for:

Removable insulation jackets

Welding blankets and fire curtains

Fabric expansion joints

Flexible connectors and ducts

Equipment protection covers

Smoke curtains

Pipe and valve insulation

Electrical insulation barriers

Different thicknesses, colors, coating weights and roll widths can be supplied according to the intended application.

What Is PTFE Coated Fabric?

PTFE coated fiberglass fabric is produced by coating woven fiberglass cloth with polytetrafluoroethylene, commonly abbreviated as PTFE.

The fiberglass base provides mechanical strength and dimensional stability, while the PTFE surface offers excellent release properties, low friction and resistance to many industrial chemicals.

PTFE coated fabric is frequently used for:

Heat-sealing equipment

Release sheets

Conveyor belts

Drying machinery

Food-processing equipment

Packaging machinery

Laminating and heat-pressing processes

Chemical-resistant protective layers

Electrical insulation components

Where air circulation is required, an open-grid PTFE coated fiberglass mesh fabric may be used for drying, curing and conveying processes.

Silicone Coated Fabric vs PTFE Coated Fabric: Key Differences

The information above provides a general comparison. Actual performance depends on the coating formulation, fiberglass structure, thickness and operating conditions.

1. Temperature Resistance

Both silicone and PTFE coated fiberglass fabrics are used in high- and low-temperature environments. Many standard grades are designed for continuous operation at approximately -70°C to +260°C.

However, the exact operating limit should be confirmed for each product. Buyers need to distinguish between:

Continuous operating temperature

Maximum short-term temperature

Temperature of the fiberglass base cloth

Temperature limit of the coating

Direct and indirect heat exposure

Contact heat and radiant heat

Frequency of temperature cycling

The fiberglass substrate may tolerate a higher temperature than the coating, but the selection must be based on the performance of the complete coated material.

For insulation jackets, welding protection and flexible heat barriers, silicone coated fabric is often the more practical option because it retains good flexibility and can be fabricated around irregular equipment.

For heat-sealing, baking, drying and conveyor applications, PTFE coated fabric is often preferred because it combines temperature resistance with a non-stick surface.

2. Flexibility and Handling

Silicone coated fiberglass fabric has a rubber-like surface and generally offers good flexibility. It can be cut, sewn, folded and fabricated into covers or protective components.

This makes silicone coated fabric particularly suitable for products that must follow curved or irregular surfaces, such as:

Valves

Flanges

Pumps

Turbines

Exhaust pipes

Industrial ducts

Machinery housings

For applications exposed on only one side, single-side silicone coated fiberglass fabric can provide a flexible and relatively lightweight solution.

PTFE coated fabric is also flexible, especially in lighter thicknesses, but its main advantages are surface release and low friction rather than softness. It is more frequently selected for flat sheets, conveyor surfaces and machine components.

Choose silicone coated fabric when repeated folding, wrapping or fabrication around complex shapes is important.

3. Non-Stick and Release Properties

PTFE coated fabric provides significantly better non-stick performance than silicone coated fabric. Adhesives, molten plastics, food products and other processed materials are less likely to bond to its surface.

Its low-friction surface makes it suitable for:

Heat-press release sheets

Packaging machinery

Plastic bag sealing equipment

Laminating machines

Food-processing belts

Drying conveyors

Release liners

Mould-release applications

Silicone coated fabric can be cleaned and offers good resistance to many surface contaminants, but it does not provide the same level of release performance as PTFE.

If the primary requirement is preventing hot, sticky or adhesive material from bonding to the surface, PTFE coated fiberglass fabric is usually the better choice.

4. Chemical Resistance

PTFE is known for its resistance to a broad range of chemicals and solvents. This makes PTFE coated fiberglass fabric suitable for industrial processes where the material may be exposed to corrosive substances.

Silicone coated fiberglass fabric also offers useful resistance to water, oils, weak acids, alkalis and many common contaminants. However, its compatibility depends more strongly on:

Chemical type

Concentration

Exposure time

Operating temperature

Continuous contact or occasional splashing

Cleaning chemicals

For aggressive chemical environments, PTFE coated fabric is generally preferred. Chemical compatibility should nevertheless be verified against the actual substance and working conditions.

For general factory environments involving moisture, lubricants and occasional oil splashes, silicone coated fabric may provide sufficient protection while offering greater flexibility.

5. Weather and Outdoor Performance

Silicone coatings offer excellent resistance to ozone, oxidation, sunlight and temperature changes. Therefore, silicone coated fiberglass fabric is often selected for outdoor insulation covers, equipment protection and flexible connections.

Its weather resistance makes it suitable for:

Outdoor valves and pipelines

Power-generation equipment

Marine installations

Exhaust systems

Ventilation equipment

Industrial machinery covers

PTFE coated fabric also has good resistance to weathering and UV exposure. However, when the finished product must be frequently folded, removed or wrapped around equipment, silicone coated fabric may offer more convenient handling.

For long-term outdoor use, buyers should also consider seam construction, fasteners, drainage, wind load and exposure to standing water.

6. Water and Moisture Resistance

Both coatings can improve the water resistance of fiberglass cloth.

Silicone coated fabric is widely used as the outer layer of removable insulation jackets because it helps protect the internal insulation from moisture, oil and outdoor exposure.

A double-sided coating can provide additional surface protection when both sides of the material may come into contact with moisture. For less demanding applications, a one-side silicone coated fiberglass fabric may be sufficient.

PTFE coated fabric also provides excellent water resistance because of its low surface energy. It is useful when water resistance must be combined with non-stick or chemical-resistant performance.

However, the coating alone does not make a complete cover or belt waterproof. Seams, joints, eyelets and other openings must also be correctly designed.

7. Abrasion and Mechanical Durability

Silicone coated fiberglass fabric provides good resistance to repeated handling, folding and surface abrasion. Heavier coating weights can provide additional mechanical protection, although they may also increase stiffness and finished-product weight.

It is often suitable for:

Reusable insulation jackets

Flexible connectors

Removable equipment covers

Industrial curtains

Fabric expansion joints

PTFE coated fabric offers a durable working surface, but scratches or coating damage may reduce its non-stick performance. Proper belt tension, alignment and handling are therefore important in conveyor applications.

The fiberglass weave, coating thickness and finished material weight should be evaluated together. A thicker fabric is not automatically better, especially when flexibility is essential.

8. Welding and Fire Protection

For welding curtains, welding blankets and spark barriers, silicone coated fabric is generally the more appropriate choice.

Its flexibility allows it to be installed as a curtain or protective cover, while the fiberglass substrate helps withstand sparks and radiant heat. A specialized fireproof silicone fiberglass cloth fabric can be considered for welding and industrial fire-protection applications.

When selecting material for welding protection, confirm:

Welding process

Spark and spatter intensity

Distance from the heat source

Continuous or occasional exposure

Required flame-resistance standard

Fabric thickness and weight

Vertical or horizontal installation

PTFE coated fabric is normally not the first choice for direct welding-spatter protection because its key benefits are release performance, low friction and chemical resistance.

9. Removable Insulation Jackets

Silicone coated fiberglass fabric is commonly used as the external fabric of removable insulation jackets for valves, pumps, turbines, flanges and pipelines.

For this application, silicone fabric offers several advantages:

Good flexibility around irregular shapes

Resistance to water and oil

Good mechanical strength

Easy cutting and sewing

Resistance to weathering

Suitable for repeated installation and removal

Available in different colors and thicknesses

PTFE coated fabric may be considered when exceptional chemical resistance or a low-friction surface is required. For most standard removable insulation jackets, however, silicone coated fiberglass fabric provides a better balance of flexibility, protection and fabrication performance.

10. Conveyor Belts and Drying Equipment

PTFE coated fabric is usually the better choice for industrial conveyor belts, drying equipment and heat-processing machinery.

Its non-stick surface helps reduce product adhesion, while its low friction supports smooth material movement. PTFE coated mesh allows airflow through the belt, which can improve drying efficiency.

Typical applications include:

Textile drying machines

Screen-printing dryers

Food-processing ovens

Packaging lines

UV curing equipment

Heat-shrink tunnels

Microwave drying systems

For open-grid conveyor applications, PTFE coated fiberglass mesh fabric is generally more suitable than solid coated fabric.

Silicone coated fabric may be used for some flexible industrial belts or protective components, but it cannot match PTFE's non-stick and low-friction properties.

11. Expansion Joints and Flexible Connectors

Fabric expansion joints must accommodate thermal expansion, vibration and equipment movement. Silicone coated fiberglass fabric is often selected because it is flexible, tough and resistant to weathering.

It can be used as one layer in expansion-joint systems for:

Power plants

Steel mills

Cement plants

Chemical facilities

Industrial boilers

Ventilation systems

Exhaust-gas ducts

PTFE coated fabric may be selected where stronger chemical resistance or a low-friction barrier layer is needed. Some demanding expansion-joint structures use multiple layers, with each material performing a different function.

Selection should consider temperature, pressure, movement, gas composition and chemical exposure rather than relying on a single material property.

Application Comparison

Which Material Should You Choose?

Choose silicone coated fiberglass fabric when your application requires:

Good flexibility

Repeated folding or handling

Outdoor weather resistance

Fabrication around irregular equipment

Welding or spark protection

Removable insulation jackets

Flexible connectors or expansion joints

Resistance to moisture, oils and general industrial contaminants

Choose PTFE coated fiberglass fabric when your application requires:

Excellent non-stick performance

Very low surface friction

Strong chemical resistance

Easy release of adhesive or processed materials

Conveyor-belt operation

Heat sealing or laminating

Drying and curing processes

A smooth and easy-to-clean working surface

In some complex systems, both materials may be used in different layers or components. The correct solution depends on the full operating environment.

Information to Provide When Requesting a Quotation

Before requesting a coated fiberglass fabric quotation, prepare the following information:

Intended application

Continuous operating temperature

Maximum short-term temperature

Direct or indirect heat exposure

Required thickness and weight

Roll width and length

One-sided or double-sided coating

Solid fabric or open mesh

Required color

Indoor or outdoor installation

Exposure to water, oil or chemicals

Required flame or safety standards

Fabrication method

Order quantity

Providing complete operating conditions helps the supplier recommend a suitable coating, fiberglass weave and finished thickness.

Frequently Asked Questions

Is PTFE coated fabric more heat resistant than silicone coated fabric?

Both materials are commonly available for continuous operation at temperatures up to approximately 260°C, depending on the product grade. The correct choice should consider not only temperature but also flexibility, chemical exposure, surface friction and fabrication requirements.

Which fabric is better for insulation jackets?

Silicone coated fiberglass fabric is generally better for removable insulation jackets because it is flexible, weather-resistant and easy to sew around valves, pumps and irregular equipment.

Which material has better non-stick performance?

PTFE coated fiberglass fabric provides significantly better non-stick and release performance. It is the preferred option for heat sealing, food processing, packaging and laminating applications.

Can silicone coated fabric be used outdoors?

Yes. Silicone coated fabric offers good resistance to ozone, sunlight, oxidation, moisture and temperature changes, making it suitable for many outdoor industrial applications.

Which material is better for chemical environments?

PTFE coated fabric generally offers broader chemical resistance. However, compatibility should always be confirmed using the actual chemical type, concentration, temperature and exposure time.

Can both materials be customized?

Yes. The silicone fiberglass fabric range and PTFE fiberglass fabric range can be supplied in different thicknesses, widths, roll lengths, colors and coating structures. Availability depends on the selected product and order quantity.

Conclusion

Silicone coated fabric and PTFE coated fabric share a strong, heat-resistant fiberglass base, but their surface properties make them suitable for different applications.

Silicone coated fiberglass fabric is generally the better choice for insulation jackets, welding protection, outdoor covers, flexible connectors and expansion joints. It offers a practical combination of flexibility, durability and weather resistance.

PTFE coated fiberglass fabric is more suitable for conveyor belts, release sheets, heat-sealing machinery and chemical-processing applications because of its excellent non-stick properties, low friction and chemical resistance.

Instead of choosing solely by temperature rating or price, evaluate the application, movement, surface contact, chemical exposure and fabrication method. This will help ensure that the selected coated fiberglass fabric delivers reliable long-term performance.