This article covers core performance indicators for PTFE high-temperature tape used in vacuum coating, vacuum heat treatment and similar environments. Key requirements differ greatly from atmospheric use: outgassing is most critical (TML≤1%, CVCM≤0.1%; aerospace/optical grades require TML≤0.5%, CVCM≤0.01%); temperature resistance must be verified for both PTFE substrate (260°C) and adhesive layer; specially purified low-outgassing silicone PSA is required to prevent siloxane contamination; high-temperature holding power prevents creep and edge lifting; cleanliness demands no fiber shedding and low ionic content; anti-static tape (surface resistivity 10⁶-10⁹ Ω/sq) prevents ESD damage; plasma resistance must be evaluated for sputtering/PECVD processes; thermal shrinkage below 2% ensures masking precision.

This article compares room-temperature and high-temperature maturation of silicone pressure-sensitive adhesive for PTFE tape. High-temperature maturation (120-180°C) creates dense crosslinked networks with strong cohesive strength, preventing adhesive residue after peeling. It forms chemical anchoring bonds with PTFE substrates via primer co-curing, eliminating delamination risks. High-temperature maturation also removes low-molecular volatiles before delivery, preventing bubbling and silicone oil contamination during first heating.

This guide covers PTFE high-temperature tape selection for injection molding demolding and anti-stick applications. Temperature-based selection: ≤260°C for general plastics (standard silicone PSA tape, 0.13-0.18mm); 260-300°C for high-temperature engineering plastics like PC, PA66, POM (high-temp silicone adhesive, 0.18-0.25mm); 300-400°C for PEEK, LCP, PPS near hot runners (adhesive tape fails; use adhesive-free PTFE cloth or PFA film). Material-based selection: tacky materials need high-release pure PTFE surfaces; glass/mineral filled materials require heavy-duty 0.25mm+ wear-resistant tape; corrosive additives demand chemically resistant adhesive and dense substrate; static-sensitive applications need anti-static black PTFE tape.

PTFE-coated fiberglass cloth is widely used in rubber processing for its heat resistance, non-stick property, and low friction. Key applications include: release liners for plate/vacuum vulcanization and tire molding; non-stick conveyor belts for open mills, calenders, and cooling lines; interleave cloth for semi-finished rubber storage; specialized handling of silicone and fluororubber; and oven trays for post-curing. Benefits include eliminating mold adhesion, reducing release agent use, preventing roller wrapping, and ensuring smooth demolding.

The glass transition temperature (Tg) of silicone pressure-sensitive adhesive is around -120°C – far lower than acrylic adhesives. This ultra-low Tg keeps PTFE high-temperature tape flexible and sticky even at -70°C, preventing brittle cracking and enabling reliable adhesion in cryogenic applications.

The choice of release paper or film substrate and release agent directly impacts the storage stability and peeling performance of PTFE high-temperature tape. This article compares PET vs. kraft paper substrates and silicone vs. fluorinated release agents, recommending the optimal combination for zero-residue peeling and long-term reliability.