PTFE high-temperature cloth maintains excellent electrical insulation from -180°C to 260°C: volume resistivity >10¹³ Ω·cm at 200°C, dielectric constant stable at 2.0-2.1. Above 260°C, PTFE softens, decomposes above 327°C, losing insulation permanently. Below 0°C, insulation improves but coating becomes brittle. Stay within 260°C for reliable performance.

PTFE high-temperature fabric (PTFE-coated fiberglass) is ideal for food conveyor belts due to its 260°C heat resistance, -70°C cold flexibility, non-stick surface, and FDA compliance. Key applications: bakery ovens (biscuits, bread, pizza), fried food conveyors, candy cooling lines, freezing tunnels, heat sealers, and roller wrapping. Reduces waste and cleaning time.

Surface finishing agents applied to fiberglass fabric before PTFE coating are critical for final PTFE high-temperature cloth performance. Organosilane coupling agents create molecular bridges between inorganic glass fiber and organic PTFE, boosting peel strength from <2 N/cm to 4-8+ N/cm. Proper treatment also enhances heat resistance (260°C+), dielectric performance, and chemical resistance. Untreated fabric leads to delamination, bubbling, and short service life.

Warp and weft density of fiberglass fabric determines PTFE high-temperature cloth performance. Higher density increases tensile strength and surface smoothness but reduces tear strength (inverted U-curve), flexibility, and coating penetration. Optimal density balances penetration, tear resistance, flexibility, and surface finish. Low density suits dynamic bending; high density for non-stick and insulation.

Calendering – pressing PTFE-coated fabric between heated mirror rollers at 360-380°C – dramatically alters surface morphology, release properties, impermeability, and mechanical performance. It reduces roughness from Ra 0.5-1.0 μm to <0.05 μm, seals pinholes, improves wear resistance, but decreases tear strength and flexibility. Essential for release liners and electrical insulation.

Fiberglass weave pattern – plain, twill, or satin – significantly affects PTFE high-temperature fabric properties. Satin weave offers highest tear strength (2-3x plain) and flexibility, ideal for dynamic bending. Plain weave provides best dimensional stability and peel adhesion, suited for static applications. Twill balances all properties for general use.

Coating uniformity of PTFE high-temperature fabric is determined by four factors: coating formulation (particle size 0.15-0.35 μm, viscosity, solid content), coating & sintering process (blade coating preferred for uniformity), substrate quality (weave pattern, pre-treatment), and production environment (20-25°C, <60% RH). Dip + blade combined process balances penetration and surface smoothness.

Proper cleaning and maintenance extend the life of PTFE high-temperature fabric. Clean after use and after cooling. Use soft brushes, neutral detergents, or alcohol for stains. Never use strong acids/alkalis, bleach, or metal scrapers. Regular silicone oil lubrication reduces wear. Follow these guidelines to prevent coating damage.

PTFE high-temperature fabric and silicone fabric both use fiberglass cloth as a base but differ in coating material (PTFE resin vs silicone rubber). PTFE excels in non-stick, wear resistance, and chemical resistance up to 260°C. Silicone fabric offers superior flexibility, electrical insulation, and fire resistance (up to 230°C). Choose based on your priority.

PTFE high-temperature fabric offers exceptional chemical resistance, withstanding strong acids, alkalis, organic solvents, and corrosive gases. This article details its resistant substances, limitations (molten alkali metals, strong fluorinating agents), and key factors like temperature, concentration, and mechanical stress.