Non-metallic Sealing Products Testing

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Testing of Sheet Material for Non-metallic Sealing Gaskets

The industry of non-metallic sealing gasket sheet materials in China has gradually iterated and upgraded alongside the development of the industrial system. In the 1980s and 1990s, with the rise of basic industries such as chemicals and machinery, these sheet materials entered the stage of mass production. Traditional asbestos paper was the mainstream product, primarily meeting basic sealing needs under conventional working conditions. Since the turn of the century, the deepening of industrialization and the tightening of environmental protection policies have driven the transformation towards non-asbestos materials. Concurrently, the surge in demand for corrosion resistance, non-toxicity, and adaptability to extreme media in sectors such as chemicals, food, and pharmaceuticals has prompted the material to diversify from a single rubber sheet to fluoroelastomer composite sheets, graphite-reinforced sheets, polytetrafluoroethylene (PTFE)-modified sheets, and other materials. In recent years, the rise of emerging industries such as new energy (e.g., hydrogen energy, lithium batteries) and high-end equipment manufacturing has imposed stringent requirements on sheet materials, including resistance to extremely high/low temperatures, strong acid/alkali corrosion resistance, and low leakage rates. Coupled with the iterative updating of standards, the industry is accelerating the phase-out of outdated production capacity and focusing on high-end customization. Currently, China has become a major global producer of non-metallic sealing gasket sheet materials, with products covering all industrial fields, including petrochemicals, food and pharmaceuticals, new energy, and aerospace.

We have established a specialized testing team for sealing materials, offering customized testing services for sealability, media resistance, mechanical properties, and more based on media type and operating parameters, helping products build a competitive advantage in reliability and compliance.

Testing Products

Oil-Resistant Asbestos Rubber Sheets

Asbestos Rubber Sheets

Coated Rubber Sheets for Gaskets

Acid-Resistant Asbestos Rubber Sheets

Asbestos Latex Paper Sheets

Flexible Graphite Sheets

Testing Items

Transverse Tensile Strength (Cross-machine direction)

Compressibility

Recovery (Spring-back)

Density

Flexibility (Softness)

Oil Immersion Properties (Fluid compatibility)

Oil Tightness / Fluid Seal

Nitrogen Leakage Rate

Creep Relaxation Rate (Stress relaxation)

Aging Coefficient (Heat aging)

Heat and Pressure Resistance (Thermal stability under load, optional omission if duplicate: general thermal stability/aging and heat resistance already covered)

Pencil Hardness (Surface)

Heat Resistance / Thermal Resistance

Liquid Resistance (Fluid resistance, duplicate entry below, consolidated)

Loss on Ignition (LOI)

Moisture Content (Water/Moisture)

Ash Content

Thermal Gravimetric Loss / Thermogravimetric analysis (TGA) loss

Sulfur, Chlorine, Fluorine Content (Total/leachable)

Testing Standards

Oil-Resistant Asbestos Rubber Sheets:

GB/T 539, GB/T 20671.7, GB/T 20671.2, GB/T 20671.5, GB/T 22308, GB/T 20671.8, GB/T 20671.3, GB/T 20671.4, GB/T 540

Asbestos Rubber Sheets:

GB/T 3985, GB/T 540, GB/T 20671.8, GB/T 20671.2, GB/T 20671.5, GB/T 22308

Coated Rubber Sheets for Gaskets:

JC/T 2794, GB/T 3512, GB/T 20671.5, GB/T 20671.2

Acid-Resistant Asbestos Rubber Sheets:

JC/T 555

Asbestos Latex Paper Sheets:

JC/T 554

Flexible Graphite Sheets:

JB/T 7758.2, JB/T 9141.1, JB/T 9141.2, JB/T 9141.3, JB/T 9141.4, JB/T 15079

Service Advantages

Specialized in performance testing of non-metallic sealing gasket sheet materials for over twenty years, precisely matching the sealing requirements of extreme working conditions across multiple industries.

Deep engagement with the sealing material standard system, leading comparative research on domestic and international standards (covering GB and ASTM series).

Lead drafter of key industry standards, including GB/T 539-2008 "Oil-resistant asbestos rubber sheets" and GB/T 3985-2008 "Asbestos rubber sheets".

A long-term strategic partner for numerous leading sealing material manufacturers and high-end equipment producers in core industrial regions, including the Yangtze River Delta, Pearl River Delta, and Bohai Rim. Provided specialized testing support to companies such as Guotai, Hengda, and Ishikawa, earning high industry trust through a deep understanding of industrial sealing scenarios.