Release: PET Film vs Glassine vs Kraft

Jiangsu Aokai New Materials, a professional manufacturer of PTFE high-temperature tapes, takes you to learn more. When selecting release materials for PTFE high-temperature fabrics, PET release film, glassine release paper and kraft release paper bring distinct differences in the storage stability and release performance of PTFE high-temperature products. Proper selection of release materials is the key to ensuring adhesive surface quality and service performance of PTFE high-temperature fabrics.

1. Influence of Release Materials on Storage Stability of PTFE High-Temperature Fabrics

The service life of PTFE high-temperature fabrics is directly determined by the weather resistance of release materials.

· PET Release Film: Endows PTFE high-temperature fabrics with excellent storage stability. Its common temperature resistance is below 150℃, and some models can exceed 200℃. Featuring stable dimension, waterproof and moistureproof properties, it can extend the shelf life of sealed-packaged PTFE high-temperature fabrics by more than 30%, and maintain stable release force after long-term storage.

· Glassine Release Paper: Offers average storage stability. Its temperature resistance is generally lower than 120℃, and it tends to absorb moisture and wrinkle in high-humidity environments. PTFE fabrics matched with it need to be stored in strictly temperature and humidity controlled environments to guarantee storage quality.

· Kraft Release Paper: Shows poor storage stability. It has low temperature resistance and strong moisture absorption. Products using kraft release paper must be kept away from moisture during storage to prevent failure of the release layer.

PTFE high-temperature fabrics are mostly coated with silicone pressure-sensitive adhesive, whose small molecular substances are prone to permeation during storage and cause increased release force. With dense internal structure, PET film can form an effective isolation layer to keep stable peeling force of adhesive layers. By contrast, paper-based materials have loose texture and far weaker protection against adhesive layers.

2. Influence of Release Materials on Release Effect in Practical Use

Smooth peeling performance is an important standard to judge the quality of PTFE high-temperature fabrics.

· PET Release Film: Delivers superior release effect. Its release force can be precisely customized with uniform and stable peeling performance. The ultra-smooth surface fits closely with adhesive surfaces, keeping the glue side flat, flawless and highly clean.

· Glassine Release Paper: Provides favorable release effect. It owns good stiffness and offers even support during peeling. Nevertheless, its micro surface is less smooth than PET film, which may leave subtle paper grain on the adhesive surface of PTFE fabrics.

· Kraft Release Paper: Presents ordinary release performance with relatively large release force and uneven peeling effect. Its rough surface may leave indentation textures on adhesive surfaces, and there exists slight powder falling risk.

3. Quick Selection Guide for Release Materials of PTFE High-Temperature Fabrics

Choose suitable release materials according to actual application scenarios:

· PET Release Film: Ideal for PTFE fabrics used in precision electronic die-cutting, high-temperature manufacturing and other scenarios requiring high cleanliness. With high stability and accurate controllable release force, it is the preferred choice for high-grade PTFE products.

· Glassine Release Paper: Suitable for industrial-grade PTFE fabrics and die-cutting products with low moisture resistance requirements. It features high stiffness and cost advantages, perfectly matching high-speed automatic production.

· Kraft Release Paper: Applicable to heavy-duty packaging-grade PTFE fabrics with loose requirements on surface finish and release force. Its high mechanical strength brings prominent cost benefits in such scenarios.

In conclusion, PET release film is the optimal choice to secure long-term storage performance and premium release experience of PTFE high-temperature products, while paper-based release materials are more suitable for cost-sensitive fields with moderate performance requirements.

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

If you need to know detailed parameters, application scenarios and customized solutions of our full-range products including PTFE high-temperature cloth, PTFE high-temperature tape, PTFE high-temperature mesh belt, seamless fusing machine belt, single-sided PTFE fabric, high-temperature resistant conveyor belt and high-temperature resistant fiberglass cloth, please feel free to contact us:

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