What is non-asbestos board? Detailed explanation of eco-friendly industrial sealing and insulation

In industrial piping, boiler equipment, pressure vessels, and pump/valve flange sealing scenarios, traditional asbestos sheets dominated the sealing material market for a long time due to their low cost, pressure resistance, and thermal insulation. However, with the upgrading of national environmental protection policies and the implementation of health and safety standards, asbestos products have been completely restricted from use due to their fatal defects of dust-induced carcinogenicity and environmental pollution. Against the backdrop of this industry iteration non-asbestos sheets (asbestos-free rubber sheets) have become the standardized replacement material for traditional asbestos sheets. They perfectly inherit the sealing, pressure resistance, and thermal insulation of traditional sheets while eliminating the safety hazards of asbestos material, making them the currently universal eco-friendly sealing sheets used in the power, chemical, HVAC, mechanical, and shipbuilding industries Today, we will comprehensively analyze the performance, classification, application scenarios, and selection tips of non-asbestos sheets.
I. What are non-asbestos sheets? full name of non-asbestos sheets is asbestos-free fiber rubber sealing sheets, which is a new type of eco-friendly industrial sealing substrate. The product uses eco-friendly-free fibers such as aramid fiber, glass fiber, and composite mineral fiber as an reinforcing skeleton, paired with high-quality rubber binders like nitrile rubber and ethylene propylene diene monomer (EPDM) rubber, and is manufactured through processes of intensive mixing, calendering, high-temperature vulcanization, and dense shaping. The biggest difference from traditional asbestos sheets: zero addition throughout the entire process, no harmful dust, and compliance with environmental protection and safety supervision standards. The sheets have a dense structure, good flexibility, and excellent compression resilience, and be directly cut to make various sealing gaskets. They are suitable for most medium-to-low pressure, ambient temperature, and medium-temperature industrial sealing working conditions, making them a core for factory environmental protection rectification, equipment maintenance, and old equipment renovation.

II. Core advantages of non-asbestos sheets: Why do they completely replace asbestos sheets? . Safe and environmentally friendly, with extremely strong compliance Non-asbestos sheets eliminate the hazards of asbestos dust at the source. There is no release of toxic and harmful substances during the process of production, installation, use, and disposal, fully complying with national safety production, occupational health, and environmental protection acceptance standards. They completely solve the problems of non-compliant environmental assessments and safety supervision penalties faced by enterprises due to the use of asbestos products, making them a standardized compliant material for industrial use. 2. Stable sealing, resistant to damage and Traditional asbestos sheets are relatively brittle, and after long-term use, they are prone to powdering, cracking, and shedding, leading to flange air, water, or oil. In contrast, non-asbestos sheets have tightly bonded fibers, stronger toughness, and significantly improved pressure and fatigue resistance. They are not easily deformed, hardened, or damaged under-term pressure, providing long-lasting and stable sealing performance, effectively reducing the failure rate of equipment leakage. 3. Compatible with multiple media, maximizing versatility High-quality-asbestos sheets are resistant to water, steam, air, oil products, and weak acid/alkali corrosion, and are not swollen or corroded by conventional industrial media. Whether it is water heating piping, steam equipment, oil transport equipment, or ordinary chemical media working conditions, they can be stably adapted, making them a highly versatile all-purpose sealing sheet4. Easy to process with low cost and outstanding cost-performance ratio The sheets are flat and uniform, for arbitrary cutting, drilling, and stamping. Various customized specifications and irregular gaskets can be produced with zero processing threshold and low waste. Compared to high-end sealing materials like PTFE and, non-asbestos sheets are affordable and suitable for most conventional operating conditions, balancing performance and cost to offer extremely high industrial cost-performance.

III. Main Classifications Non-Asbestos Sheets and Operating Condition Adaptations Commonly used industrial non-asbestos sheets are mainly divided into three categories based on temperature/pressure resistance and media compatibility. selection is essential to avoid sealing failure: - Ordinary Non-Asbestos Sheets (Low-Pressure Type): Suitable for room temperature, low pressure, water, and air media. Wid used in ordinary plumbing equipment, ventilation ducts, and light mechanical seals, serving as the basic model for civil and general industrial use. - Oil-Resistant Non-Asbestos (Medium-Pressure Type): Utilizing an oil-resistant rubber formula, they resist oil swelling and corrosion. Specifically used for oil transport equipment, oil pumps, oil tanks, and oil flange seals involving diesel, engine oil, hydraulic oil, etc. - High-Temperature Resistant Non-Asbestos Sheets (High-Pressure Type): Upgraded with high-strength and high-temperature resistant colloids, offering stronger temperature and pressure resistance. Suitable for high-temperature steam pipelines, boiler flanges, heat exchangers, and medium-pressure industrial equipment, to high-temperature operating conditions in power plants and chemical industries.

IV. Core Application Scenarios, Covering Sealing Needs Across All Industries 1. Power and Thermal Industry Widely for steam pipelines, boiler manholes and handholes, heat exchange equipment, and HVAC thermal network flange seals in power plants. They withstand high-temperature steam and maintain stable pressure resistance adapting to the continuous year-round operation of thermal systems. 2. Chemical and Environmental Protection Industry Used for ordinary chemical pipelines, sewage treatment equipment, and environmental desulfurization equipment gaskets. They resist weak acid/alkali and water vapor corrosion, replacing old asbestos gaskets to meet the environmental technical renovation needs of factories. 3. Machinery Manufacturing and General End-face sealing for various pumps, valves, air compressors, hydraulic equipment, and pressure vessels. They solve minor leaks caused by equipment vibration during operation, adapting to the routine and replacement of mechanical equipment. 4. Shipbuilding and HVAC Engineering Sealing for ship piping, central air conditioning pipelines, and water supply/drainage systems. The material is environmentally friendly odorless, and resistant to water vapor corrosion, meeting the usage standards for equipment in enclosed spaces.

V. Selection and Usage Precautions for Non-Asbestos Sheets Many equipment problems are not caused by product quality, but by improper selection and installation: 1. Select by media: For oil and water conditions, oil-resistant non-asbestos sheets must chosen; for high-temperature steam conditions, high-temperature and high-pressure models should be selected; for ordinary water and gas conditions, regular models are sufficient. This avoids material mismatch to swelling and aging. 2. Standardized installation: Before installation, clean rust and impurities from the flange contact surface to ensure a flat fit. Tighten bolts uniformly in a diagonal to avoid local excessive pressure cracking the sheet or insufficient pressure causing leaks. 3. Regular replacement: Under high-temperature and high-frequency start-stop conditions, the sheets are-term affected by alternating heat and pressure. It is recommended to inspect and replace them regularly to ensure sealing stability