Impacts of Fiberglass Cloth Surface Defects on PTFE High-Temperature Cloth Quality

As a leading source manufacturer of PTFE high-temperature cloth, Jiangsu Aokai New Materials gives you professional insights. The surface defects of fiberglass base cloth directly determine the quality ceiling of finished PTFE high-temperature cloth. Broken yarns greatly weaken its mechanical strength, skipped stitches damage structural stability, and oil stains directly cause coating failure under high temperatures. The specific impacts are detailed as follows:

1. Broken Yarns: Hidden Structural Hazards Weakening Overall Strength

Broken yarns lead to a sharp decline in the mechanical properties of PTFE high-temperature cloth. Fracture points become stress concentration areas, significantly reducing tensile strength, tear resistance and impact resistance, making the cloth fragile and prone to damage.Under dynamic stress, cracks first appear at broken yarn positions and expand outward, accelerating wear and aging. Burrs caused by broken yarns also ruin surface flatness, resulting in uneven coating of PTFE or silicone rubber, forming weak anti-stick areas on the fabric surface.Severe broken yarns will even form holes, completely destroying the thermal insulation, filtration and electrical insulation integrity of the high-temperature cloth.

2. Skipped Stitches: Irregular Weave Destroying Structural Stability

Skipped stitches disrupt the regular warp and weft weaving structure, changing local compactness and porosity. For high-temperature filtration applications, this will reduce filtration efficiency and cause uneven fluid distribution.Loose floating yarns generated by skipped stitches are easily hooked and abraded, shortening service life and damaging surface flatness. Loose weaving structure reduces structural rigidity, making the cloth more prone to deformation under heat and force, poor dimensional stability, and causing obvious dense-sparse stripe defects on the surface.

3. Oil Stains: Fatal Inducer of High-Temperature Performance Degradation

Oil stains are the most critical defect for PTFE high-temperature cloth. At temperatures above 250°C, oil stains rapidly carbonize and decompose, leaving charred black marks and seriously damaging the core anti-stick performance.Anti-stick property is the core advantage of PTFE materials. Carbonized oil residues form adhesion starting points. In applications such as plastic-steel door and window welding, welding residues easily accumulate, affecting welding quality and reducing production efficiency.In addition, oil stains drastically reduce the bonding force between the base cloth and impregnated coating, resulting in blistering, peeling and cracking of the surface coating during use, and losing effective protection for the fiberglass substrate.

4. Summary of Defect Impacts

Various surface defects exert comprehensive and fatal impacts on PTFE high-temperature cloth:

· Broken yarns damage mechanical strength and overall integrity, acting as a major killer of mechanical performance;

· Skipped stitches disrupt weaving regularity and dimensional stability, destroying the overall structure;

· Oil stains damage anti-stick performance and coating adhesion under high temperature, causing irreversible functional failure.

Therefore, strict inspection of fiberglass base cloth is the foundation for guaranteeing finished product quality.High-quality PTFE high-temperature cloth requires the defect quantity to be controlled within 40 to 50 pieces per 100 square meters. Higher-standard products prohibit stains and holes that affect normal use, with major defects limited to no more than 4 pieces. Only strict base material control can ensure that PTFE high-temperature cloth is reliable, safe and long-lasting.

The above content is provided by Jiangsu Aokai New Materials Technology Co., Ltd.

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