Teflon high-temperature fabric is a composite material made by using fiberglass fabric as the substrate, impregnating it with polytetrafluoroethylene (PTFE) dispersion, and then sintering it at high temperature.
2. Definition of the Phenomenon
Delamination refers to the separation and peeling between the surface PTFE coating and the internal fiberglass base fabric, or between multiple coating layers, where they no longer remain tightly bonded.
II. Visual Manifestations of Delamination
1. Blistering and Bulging
Raised bubbles appear on the fabric surface, with a hollow feel when pressed—this is an early sign of delamination.
2. Interlayer Peeling
The surface coating can be easily peeled off in sheets like a thin film, exposing the white fiberglass beneath.
3. Localized Whitening and Flaking
After exposure to heat or friction, the surface first turns white, followed by cracking and flaking of the coating in chunks.
III. Main Causes of Delamination
1. Thermal Stress Damage
Prolonged high-temperature operation creates internal stress between PTFE and fiberglass due to their differing coefficients of thermal expansion. Rapid heating and cooling cycles can also cause the coating to detach.
2. Production Quality Defects
Inadequate surface treatment of the fiberglass fabric, poor PTFE impregnation, or insufficient sintering can result in inherently weak interfacial bonding.
3. Adhesive Failure
For some products where PTFE film is bonded to the base fabric using adhesives, the adhesive may not withstand high temperatures, leading to direct delamination.
4. Mechanical Fatigue
Repeated flexing, high-tension stretching, and other external forces continuously damage the interface between the coating and the base fabric.
5. Chemical Attack
Strong acids, strong alkalis, or solvents may penetrate into the coating interface, causing corrosion and loss of bonding strength.
IV. Direct Hazards of Delamination and Simple Identification Methods
1. Loss of Non-Stick Performance
Once the coating peels off, the fiberglass becomes exposed, and materials will firmly adhere to the fabric surface, losing its release function.
2. Sharp Decline in Strength
The fiberglass, now unprotected by the coating, becomes prone to breakage and loosening, causing the high-temperature fabric to fail quickly.
3. Product Contamination
Detached coating debris can directly contaminate the materials being processed, such as food or textiles.
4. Simple Identification Method
Use a blade to lightly scratch an inconspicuous area. If the coating can be easily lifted like a plastic skin, delamination can be confirmed.
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