Compressed Non-Asbestos (CNA) Sheet Gaskets
Durlon® offers 11 grades of compressed non-asbestos (CNA) sheet gasket materials for industrial sealing applications involving fluids such as water, steam, oils, hydrocarbons, and selected chemicals. Each grade has its own material composition, chemical compatibility, and operating limits. Available sheets can be fabricated into gaskets for suitable flanges and equipment designs. Review the individual product specifications or consult Durlon's technical team to identify a grade that meets your application requirements.
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What Are Compressed Non-Asbestos (CNA) Gaskets?
Compressed non-asbestos gaskets are flat sheet sealing materials manufactured from a blend of synthetic fibers, elastomeric binders, and rubber compounds, combined under high pressure to produce a consistent, high-performance sealing material. They were developed as a direct, safer replacement for asbestos-based gaskets, matching or exceeding asbestos performance in chemical resistance, compressibility, and temperature tolerance, without the associated health and environmental risks.
How Durlon® CNA sheet gasket material is manufactured:
• Synthetic fibers, rubber compounds, and non-asbestos fillers are combined in precise formulations.
• The material is compressed under high pressure to create a uniform, dense gasket sheet.
• Each batch is produced under strict quality control measures to ensure consistency and reliability.
• Available in a range of grades and thicknesses to meet specific temperature, pressure, and chemical requirements.
• Sheets can be die-cut or water-jet cut to custom gasket dimensions.
Key Performance Advantages of Compressed Non-Asbestos Gaskets:
• Excellent chemical resistance across a broad range of acids, alkalis, and solvents.
• Available in grades designed for different temperature, pressure, and chemical service requirements.
• Consistent sealability across 11 product grades within the Durlon® CNA sheet gasket range.
• Manufactured without asbestos, with product-specific certifications and compliance information available for applicable grades.
• Available with FDA, NSF®, and other global certifications depending on grade.
Compressed Non-Asbestos Gasket Materials for Demanding Applications
Durlon® compressed non-asbestos gasket sheet material is suited to high-temperature applications, including steam services, heat exchangers, and high-pressure piping across power generation, refining, and chemical processing. Each sheet grade is formulated to perform within defined chemical and thermal limits, with full technical data available in the corresponding Product Data Sheets. The Durlon® range spans 11 grades from the 5000 series through to the 8900, covering a wide range of sealing environments. For applications above standard limits, see our High-Temperature Gaskets.
Non-Asbestos Gasket Material: Grades and Selection
Selecting the right non-asbestos gasket material depends on the operating media, temperature, pressure, flange conditions, and applicable material certifications. Compare the available Durlon® CNA sheet gasket grades using their Product Data Sheets to assess their suitability for your application. If you need assistance, consult Durlon®’s engineering team or complete the Gasket Application Data Form to get started.
Industry Applications for a Non-Asbestos Gasket
• Oil and gas: Suitable grades for selected hydrocarbon, pipeline, and process equipment applications.
• Chemical processing: Gaskets for compatible fluids in pumps, valves, piping, and heat exchangers.
• Power generation: Grades designed for specified steam, water, and other plant services.
• Food and beverage: Selected materials with applicable documented food-contact compliance, subject to the product and service conditions.
• Water and wastewater: Suitable grades for specified water-treatment and plumbing applications, including products with relevant potable-water certification.
• Mining, pulp and paper, and general industry: Grade-specific solutions for process piping and equipment.
CNA Sheet Gasket FAQs
How Thick Should a CNA Sheet Gasket Be?
Gasket thickness depends on flange condition, surface finish, operating pressure, and installation requirements. Thinner gaskets may offer advantages in suitable assemblies, while thicker materials can accommodate certain flange irregularities. Refer to the relevant Durlon® Product Data Sheet and application guidance before selecting a thickness.
What Temperature Can Compressed Non-Asbestos Gaskets Withstand?
The limit depends on the grade, the fluid, and the operating pressure. Each Durlon® grade of compressed non-asbestos gaskets has its own temperature and pressure ratings in its Product Data Sheet. Check the pressure and temperature combination together, not temperature alone, before you specify a grade.
What Is the Difference Between CNA and PTFE Sheet Gaskets?
CNA gaskets are manufactured using fibres, fillers, and elastomeric binders, making them suitable for various industrial sealing applications. PTFE gaskets offer broad chemical resistance and are often selected for aggressive chemical services. The appropriate choice depends on chemical compatibility, temperature, pressure, and flange conditions.
Can You Reuse a Non-Asbestos Gasket?
No. A compressed gasket takes a permanent set once the bolts are tightened, so it may not reseal when the flange is reopened. Replace the non-asbestos gasket material every time you break a joint to prevent leaks. Proper gasket installation also helps reduce the risk of leaks.
How Much Bolt Load Does a CNA Sheet Gasket Need?
The required bolt load depends on the gasket grade, dimensions, flange design, and operating conditions. Applicable assembly guidance, such as ASME PCC-1, can help inform the tightening procedure. Consult the relevant product data sheet and Durlon's technical team for application-specific recommendations.
What Information Is Needed to Request a Quote for a CNA Sheet Gasket?
Send the fluid or media, operating temperature and pressure, flange size, type and rating, and the thickness or grade you currently use. Complete the Gasket Application Data Form to provide the technical details needed for an initial assessment. Durlon's engineering team may request additional information before recommending a suitable grade.
Trust Durlon® for CNA sheet gaskets that deliver proven chemical resistance, thermal stability, and long-term sealing reliability across the world’s most demanding industries. Our engineering team is ready to assist with grade selection, custom fabrication, and technical support at every stage of your project.
Contact us today to find the right compressed non-asbestos gaskets for your application and ensure a secure, long-lasting seal.
