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PTFE Gaskets deliver reliable sealing for petrochemical operations, oil and gas applications, chemical processing, and high-pressure flanges. Available in Virgin PTFE, Carbon-Filled PTFE, and Glass-Filled PTFE grades, they provide low friction, minimal creep, and excellent resistance to corrosive media. These gaskets perform consistently in high-temperature, cryogenic, and FDA-approved sealing environments.
PTFE and CNAF Gaskets serve distinct roles. While PTFE Gaskets are ideal for aggressive chemical and thermal conditions, CNAF Gaskets, made from aramid fibre and CNAF sheet material, are preferred for steam, water, and boiler sealing where controlled compression and mechanical stability are required.
As a reliable gasket manufacturer and supplier, we support precise gasket selection for demanding industrial conditions.
Usage of industries
Oil and Gas
Chemical Industry
Power Generation
Mining
Marine
PTFE and CNAF Gaskets
PTFE Gaskets deliver reliable sealing for petrochemical operations, oil and gas applications, chemical processing, and high-pressure flanges. Available in Virgin PTFE, Carbon-Filled PTFE, and Glass-Filled PTFE grades, they provide low friction, minimal creep, and excellent resistance to corrosive media. These gaskets perform consistently in high-temperature, cryogenic, and FDA-approved sealing environments.
PTFE and CNAF Gaskets serve distinct roles. While PTFE Gaskets are ideal for aggressive chemical and thermal conditions, CNAF Gaskets, made from aramid fibre and CNAF sheet material, are preferred for steam, water, and boiler sealing where controlled compression and mechanical stability are required.
As a reliable gasket manufacturer and supplier, we support precise gasket selection for demanding industrial conditions.
Usage of industries
Oil and Gas
Chemical Industry
Power Generation
Mining
Marine
Request A Quote
By submitting this form, you agree to the privacy policy and terms of use.
PTFE and CNAF Gasket Types
At Asian Sealing Products, we supply a comprehensive range of high-performance industrial gaskets engineered to withstand demanding chemical, thermal, and high-pressure environments. Our product lineup includes Industrial-Grade PTFE Gaskets, Corrosion-Resistant PTFE Gaskets, General CNAF (Non-Asbestos Fibre) Gaskets, Reinforced Graphite Gaskets, and Expanded PTFE (ePTFE) Gaskets. Each gasket is manufactured to meet international sealing standards, ensuring superior durability, operational safety, and reliable leak-proof performance in critical industrial applications.
At Asian Sealing Products, we supply a comprehensive range of high-performance industrial gaskets engineered to withstand demanding chemical, thermal, and high-pressure environments. Our product lineup includes Industrial-Grade PTFE Gaskets, Corrosion-Resistant PTFE Gaskets, General CNAF (Non-Asbestos Fibre) Gaskets, Reinforced Graphite Gaskets, and Expanded PTFE (ePTFE) Gaskets. Each gasket is manufactured to meet international sealing standards, ensuring superior durability, operational safety, and reliable leak-proof performance in critical industrial applications.
ReinforCedGraphite
Gasket Reinforcements
General Compressed
Non-Asbestos Fibre
Your Trusted Partner for Reliable Sealing Solutions
Chemical Resistance
The PTFE gaskets are highly resistant to acids, solvents, and corrosive fluids; therefore, they are the best chemical-resistant gasket in the industrial, petrochemical, and process gasket.
Wide Temperature Tolerance
PTFE and CNAF gaskets are durable depending on the sealing temperature, -200degC to +260 °C, which is effective in cryogenic and high-temperature sealing systems.
Non-Stick & Low Friction
The PTFE gaskets have a natural, smooth, low-friction surface that minimizes wear, accumulation, and promotes the life of equipment in chemical and water-line sealing.
FDA-Approved for Sensitive Use
Our FDA-based PTFE gaskets are safe, contamination-free, and are relied upon to provide safe, non-asbestos-contaminated seals in the processing of food, beverages, and pharmaceutical products.
PTFE and CNAF Gasket Applications
Asian Sealing Products produces PTFE and CNAF gaskets that are designed to be used in highly industrialized applications. The PTFE Gaskets ( Polytetrafluoroethylene Gaskets) provide chemical-resistant, temperature-resistant sealing of food, pharma, and process industries. CNAF gaskets (Compressed Non-Asbestos Fibre Gaskets) are durable high-pressure gaskets, which are used in boilers, refineries, and marine systems- making sure of safety, purity, and efficient performance.
Asian Sealing Products produces PTFE and CNAF gaskets that are designed to be used in highly industrialized applications. The PTFE Gaskets ( Polytetrafluoroethylene Gaskets) provide chemical-resistant, temperature-resistant sealing of food, pharma, and process industries. CNAF gaskets (Compressed Non-Asbestos Fibre Gaskets) are durable high-pressure gaskets, which are used in boilers, refineries, and marine systems- making sure of safety, purity, and efficient performance.
Pharmaceutical
- PTFE gasket provides high-purity sealing for medical devices and drug production.
Petrochemical Resilience
- PTFE gaskets are used in pipelines and chemical storage for leak-proof sealing.
Food and Beverage Prowess
- Using PTFE gaskets in these industries ensures contamination-free processing with FDA-compliant materials.
Aerospace Precision
- A PTFE gasket enhances durability in fuel systems and engine components.
Oil and gas industries
- CNAF gaskets provide reliable sealing in pipelines, refineries, and offshore platforms.
Boilers, pipelines, and heat exchangers
- CNAF gasket ensures heat and pressure resistance for uninterrupted operation.
Marine and shipbuilding
- Using CNAF gaskets prevents leaks in water, fuel, and hydraulic systems.
Mining and heavy machinery
- Non-asbestos Gaskets offers strong sealing solutions for extreme operational environments.
PTFE and CNAF Gasket Materials
PTFE and CNAF gaskets are manufactured using various materials based on the application’s requirements. The material selection depends on factors such as the type of fluids being sealed, operating conditions (including temperature and pressure), and the overall environment. Here are some common materials used for manufacturing PTFE and CNAF gaskets:
Ring gaskets are manufactured using various materials based on the application’s requirements. The material selection depends on factors such as the type of fluids being sealed, operating conditions (including temperature and pressure), and the overall environment. Here are some common materials used for manufacturing ring gaskets:
Natural Rubber
Natural Rubber offers excellent flexibility and sealing for low-temperature applications, performing reliably up to 80°C.
Neoprene Rubber
Neoprene provides good resistance to oils, weathering, and moderate chemicals, suitable for applications up to 100°C.
Silicone Rubber
Silicone delivers superior heat resistance and stability, making it ideal for high-temperature sealing up to 215°C.
EPDM Rubber
EPDM offers outstanding resistance to steam, water, and weathering, functioning effectively up to 148°C.
Butyl Rubber
Butyl rubber features low gas permeability and strong chemical resistance, supporting applications up to 100°C.
Nitrile Rubber (NBR)
NBR is well-suited for oil, fuel, and hydrocarbon sealing, with a maximum temperature tolerance of 105°C.
Viton Rubber
Viton provides exceptional resistance to chemicals, solvents, and high temperatures, operating safely up to 204°C.
SBR Rubber
SBR rubber delivers good abrasion resistance and durability for general-purpose sealing in moderate-temperature environments.
Aramid fibres
Provide high strength, heat resistance, and durability, forming the core reinforcement of CNAF gaskets.
Mineral fibres
Enhance thermal stability and pressure resistance for reliable sealing in harsh industrial conditions.
Inorganic fillers
Improve density, compressibility, and performance under high temperature and chemical exposure.
Elastomeric binders
Act as the bonding agent, ensuring flexibility, sealing integrity, and structural cohesion in CNAF gasket sheets.
Product Details
PTFE Gasket Types and Their Properties
PTFE Gaskets are designed for high-performance industrial applications that require chemical resistance, temperature, and pressure. These gaskets are manufactured in Virgin PTFE, Carbon-Filled PTFE, and Glass-Filled PTFE and have low creep, high dielectric properties, and long service life in a wide range of operating conditions.
Raised-Face PTFE Gaskets
These PTFE Gaskets are designed to be used in high-pressure flange joints (high-pressure) where uniform distribution of loads is necessary, and leak-free sealing is required.
Full-Face PTFE Gaskets
These PTFE Gaskets are used on flat-face flanges, and they cover the whole surface of the flange, eliminate flange damage, and offer uniform chemical resistance.
Custom PTFE Gaskets
PTFE Gaskets of non-standard flanges and equipment are made in custom cut forms, to specific mechanical and sealing needs.
PTFE Envelope Gaskets
These PTFE Gaskets are a combination of a compressible core and chemical protection, which is why the Gaskets are applicable in aggressive media with moderate pressure and temperature.
Expanded PTFE Gaskets (ePTFE)
The ePTFE Gaskets have a micro-fibrous design that provides high compressibility, low creep, and reliable sealing of irregular or damaged flanges, with temperatures ranging between -200 °C and 260 °C.
CNAF Gasket Types and Their Properties
The CNAF Gaskets (Compressed Non-Asbestos Fibre Gaskets) are applied in tight compressibility as well as cost-efficient sealing. These non-asbestos gaskets are made using aramid fibres, glass fibres, and elastomeric binders to ensure a good service in thermal and pressure-based systems.
Aramid Fibre with NBR Binder
Applicable in the oil, fuel, and hydrocarbon services, it provides stability and consistency in sealing under pressure.
Glass Fibre with NBR Binder
A cost-effective CNAF Gasket solution with good compression recovery in a moderate temperature and pressure environment.
SBR/NR Binder CNAF Gaskets
Applicable best when flexibility and low installation cost are needed, and steam, water, and boiler sealing are required.
Reinforced Graphite Gaskets
Graphite gaskets are reinforced with a view to dealing with harsh pressure and temperature conditions. They are designed using expanded graphite, reinforced with stainless steel inserts; they are very chemically resistant and stable in dimensions. These gaskets are typically applied together with PTFE Gaskets and CNAF Gaskets in intricate sealing systems that deal with steam, oil, and chemical processing.
Expanded PTFE Materials
PTFE Gaskets are often paired with elastomer-backed systems depending on application needs:
- Natural Rubber – High elasticity for dynamic sealing
- Neoprene Rubber – Resistant to oil and weathering
- Silicone Rubber – Stable at high and low temperatures, food-grade compatible
- EPDM Rubber – Ideal for water, steam, and outdoor use
- Butyl Rubber – Excellent gas impermeability
- Nitrile Rubber (NBR) – Strong oil and fuel resistance
- Viton Rubber – Premium chemical and heat resistance
- SBR Rubber – Cost-effective for general-purpose sealing
Why Choose Us?
Our product specialises in precision-engineered PTFE Gaskets that are used in critical sealing applications in chemical, petrochemical, oil and gas, boiler, and flange systems. Also included in our solutions are PTFE and CNAF Gaskets, which provide reliable sealing in high-pressure and high-temperature as well as chemically hostile conditions.
High-tech Material Expertise
Virgin PTFE, Carbon-Filled PTFE, Glass-Filled PTFE, and Expanded PTFE (ePTFE Gaskets) are used to produce our PTFE Gaskets with low creep, good dielectric properties, and high chemical resistance. Complementary Non-Asbestos Gaskets are CNAF sheet material that is guaranteed to provide controlled compressibility where needed.
Designed to Operate in Extreme Conditions
PTFE Gaskets are used in sealing systems that require high temperatures, cryogenic, and in food and pharmaceutical systems that are FDA-compliant. CNAF Gaskets give steady sealing to water and steam, oil, and boiler use where control of pressure is vital.
Industrial Focus
We have the ability to supply the petrochemical sealing, oil and gas gaskets, high-pressure flange gaskets, and chemical processing units. High-Pressure Non-Asbestos Gaskets come in at a price that fits in cost-conscious, but demanding, environments.
Self-managed Gasket Choice Support
A gasket selection guide is organized to assist in identifying when to apply PTFE Gaskets or CNAF Gaskets and provides a guideline to the maximum temperature, media compatibility, and pressure levels.
Quality, Consistency, and Reach
Our PTFE Gaskets and CNAF Gaskets are manufactured in accordance with ISO standards. They will provide consistent quality, traceability, and reliable supply with an established network of gasket manufacturers and distributors.
Specifications
PTFE Gaskets Material Grade Types
| Sl.No | Grade | Filler Content by Weight (%) | Properties |
|---|---|---|---|
| 1 | Virgin PTFE | Nil | Hygienic. Excellent Chemical Resistance. Outstanding electrical properties. |
| 2 | Glass filled PTFE | 15 – 25 | High compressive strength. Excellent chemical resistance. Improved wear resistance under load & permanent deformation. |
PTFE Gaskets – Requirement of Material Properties
| Sl.No | Material | Shore Hardness | Maximum Operating Temperature |
|---|---|---|---|
| 1 | PTFE (Polytetrafluoroethylene) | 50° – 65° Shore D | 240°C |
| 2 | 25% Glass filled PTFE (Polytetrafluoroethylene) | 60° – 75° Shore D | 240°C |
| 3 | 25% Carbon filled PTFE (Polytetrafluoroethylene) | 60° – 75° Shore D | 240°C |
PTFE gaskets vs CNAF Gaskets
| Feature | PTFE Gaskets | CNAF Gaskets |
|---|---|---|
| Material | Polytetrafluoroethylene | Compressed Non-Asbestos Fiber (Aramid, Glass, etc.) |
| Temperature Range | -200°C to +260°C (-328°F to +500°F) | Up to +400°C (typically +350°C / +662°F) |
| Chemical Resistance | Excellent (highly resistant to most chemicals and corrosive fluids) | Good (resistant to oils, fuels, gases, and some chemicals) |
| Pressure Resistance | Moderate to High (depending on type and design) | High (especially in reinforced types) |
| Flexibility & Conformability | Good to Excellent (especially expanded PTFE) | Good |
| Friction Coefficient | Very Low (non-stick properties) | Moderate |
| Applications | Pharmaceutical, chemical processing, food & beverage, aerospace, electrical insulation | Oil & gas, boilers, pipelines, heat exchangers, marine, mining, general industrial |
| Cost | Generally Higher | Generally Lower |
| FDA Compliance | Available for food and pharmaceutical applications | Not typically FDA compliant |
| Electrical Properties | Excellent dielectric properties | Poor Dielectric Properties |
| Mechanical Strength | Moderate, enhanced with fillers | High tensile strength and durability |
| Creep Resistance | Expanded PTFE has excellent creep resistance | Good |
Rubber Types Used in PTFE and CNAF Gaskets
| Rubber Type | Shore Hardness | Max Operating Temperature |
|---|---|---|
| Natural Rubber | 50° – 80° Shore D | 80°C |
| Neoprene Rubber | 50° – 80° Shore D | 100°C |
| Silicone Rubber | 50° – 80° Shore D | 215°C |
| EPDM Rubber | 50° – 80° Shore D | 148°C |
| Butyl Rubber | 50° – 80° Shore D | 100°C |
| Nitrile Rubber (NBR) | 50° – 80° Shore D | 105°C |
| Viton Rubber | 50° – 80° Shore D | 204°C |
| SBR Rubber | 50° – 80° Shore D | 100°C |
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Answers to all your possible questions.
What applications are PTFE and CNAF gaskets suitable for?
PTFE gaskets are ideal for highly corrosive chemicals, acids, solvents, and aggressive media. They perform well in pharma, chemical processing, food & beverage, and semiconductor industries.
CNAF gaskets are used in steam lines, oil & gas, petrochemical plants, pipelines, compressors, and general industrial sealing where moderate temperature and pressure resistance is required.
How do PTFE and CNAF gaskets differ in performance?
- PTFE: Excellent chemical resistance, low friction, non-contaminating, withstands temperatures up to ~260°C but not suited for high pressure.
- CNAF: Higher pressure capability, good for steam and hydrocarbon service, temperature resistance up to ~400°C depending on grade, but limited chemical compatibility compared to PTFE.
What standards or certifications do these gaskets comply with?
Depending on manufacturer and grade, PTFE and CNAF gaskets may comply with:
- ASME B16.21 / B16.5
- EN 1514 / EN 12560
- ASTM F36, F37, F38
- FDA compliance (PTFE grades)
Always check the specific datasheet for certification details.
How do I choose the right gasket thickness?
Gasket thickness depends on:
- Flange surface condition
- Operating pressure and temperature
- Desired compressibility
What is "cold flow" and how does it affect PTFE gaskets?
Cold flow (also known as creep) is the permanent deformation of PTFE material when subjected to a constant compressive load, particularly at elevated temperatures. Because PTFE is a thermoplastic, it tends to squeeze out from between the flange faces, leading to a loss of bolt load and, eventually, a leak.
Mitigation: This is largely solved by using filled PTFE grades (e.g., glass, carbon, silica fillers) or structured PTFE (e.g., ePTFE), which significantly improve creep resistance.
Can CNAF gaskets be used on damaged or warped flanges?
CNAF gaskets are highly conformable and can seal on minor imperfections better than rigid materials like PTFE or metal gaskets. Their inherent resilience allows them to compensate for slight flange separation or warpage during temperature cycling. However, severe damage requires flange repair for optimal sealing integrity.
What media are PTFE and CNAF not suitable for?
- PTFE: Generally compatible with all media but not ideal for molten alkali metals and fluorine at high temperatures.
- CNAF: Not recommended for strong oxidizing acids, concentrated alkalis, or aggressive chemicals.
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