Overview
The PTFE Gasket (GB Standard White) is a critical sealing component manufactured from pure polytetrafluoroethylene, adhering to Chinese national standards (GB). Its white color indicates uncompounded PTFE, ensuring purity for sensitive applications. As a semi-finished product, it is typically cut into sheets or custom shapes to fit flanges and joints. PTFE gaskets are indispensable in industries requiring corrosion-resistant seals, such as chemical plants, oil refineries, and food processing. The GB standard guarantees dimensional accuracy and material consistency, making it a reliable choice for B2B procurement in standardized systems.
Structure and Working Principle
The gasket's structure is homogeneous, with no reinforcing layers, providing uniform sealing performance. Its working principle relies on PTFE's cold flow properties: under compression, the material deforms slightly to fill surface imperfections between mating flanges. Unlike rubber gaskets, PTFE does not require high compression forces, reducing bolt stress. The material's microporous structure remains stable across temperatures from -200°C to +260°C, maintaining seal integrity without hardening or cracking. This makes it ideal for systems with thermal cycling.
Key Features
Chemical inertness is the standout feature, with resistance to almost all acids, alkalis, and solvents except molten alkali metals and fluorine gas. The material's non-stick surface prevents adhesion of process media, simplifying maintenance. PTFE gaskets exhibit low friction coefficients (0.05–0.10), reducing wear on mating surfaces. They are also electrically insulating and FDA-compliant for food contact. However, creep resistance is limited, so designs must account for stress relaxation over time, especially in high-load applications.
Application Areas
Primary applications include chemical processing equipment (reactors, heat exchangers), where they seal aggressive media like sulfuric acid or chlorinated solvents. Pharmaceutical industries use them in sterile piping systems due to their non-reactive nature. In food and beverage production, PTFE gaskets prevent contamination in CIP (clean-in-place) systems. They are also common in water treatment plants and semiconductor manufacturing, where purity is critical. For general industrial use, they replace asbestos gaskets in older systems due to safer handling.
Maintenance and Precautions
Inspect gaskets periodically for signs of extrusion or thinning, which indicate over-compression. Replace if the material shows permanent deformation exceeding 10% of original thickness. Avoid using sharp tools during installation to prevent cuts. Storage should be in a cool, dark place away from UV exposure, which can degrade PTFE over years. Do not reuse gaskets after disassembly, as cold-flow deformation compromises resealing capability. For high-vibration environments, consider adding a backup ring to limit movement.
B2B Procurement Guide
When procuring GB-standard PTFE gaskets, confirm compliance with specific standards like GB/T 9126 for dimensions. Request material certification (e.g., purity ≥99%) and batch test reports for density and tensile strength. Bulk purchases typically offer 15–30% cost savings. Lead times vary by thickness: 1–3mm sheets are often stocked, while thicker profiles may require 2–4 weeks. For custom shapes, provide CAD drawings with tolerance specifications. Reputable suppliers will offer die-cutting services to minimize waste.
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