In semiconductor fabrication, contamination is measured in parts per million and particle sizes in microns. A single stray ion, a trace volatile organic compound, or a microscopic particle can scrap an entire wafer batch – costing hundreds of thousands of dollars.
PTFE high-temperature tape, with its heat resistance, chemical inertness, non-stick surface, and electrical properties, plays a critical role in this environment. But not just any PTFE tape will do. Semiconductor-grade tapes must meet ultra-high cleanliness standards that far exceed those of general industrial tapes.
Aokai PTFE manufactures PTFE tape specifically for semiconductor applications. This guide covers three core application areas – wafer-level processing, packaging and testing, and equipment maintenance – and the stringent cleanliness requirements that apply to each.
During wafer fabrication, the tape serves as a temporary protective layer for high-value devices.
Process
Tape Function
Critical Requirement
Plasma cleaning & etching
Mask non-process areas, protect wafer edges from ion bombardment
Must not outgas or leave residue; withstand plasma environment
Thin-film deposition (CVD/PVD)
Block regions not requiring coating
Seamless adhesion to prevent deposition gas infiltration
Chemical mechanical planarization (CMP)
Shield wafer backsides from slurry and abrasive debris
Resist strong acids, alkalis, and oxidizing agents
2. Packaging and testing processes
Lead frame / substrate fixation: Heat-resistant positioning during wire bonding, die attach, and plastic encapsulation – holds components steady at high temperatures.
Masking for wave soldering & reflow soldering: Protects gold fingers and contact points on PCBs from solder contamination during high-temperature soldering processes.
High-temperature tape carrier sheets: Flexible carriers to secure miniature substrates on production lines without releasing particles or residues.
3. Equipment maintenance and auxiliary uses
Anti-static roller wrapping: Clads transport rollers to provide high-temperature resistant, non-stick, and static-dissipative contact surfaces – prevents wafer damage from friction and static discharge.
Cleanroom temporary marking & maintenance: For labeling, temporary cable fixing, and minor repairs without introducing contaminants.
These are the standards that distinguish semiconductor-grade PTFE tape from general-purpose tape. Non-compliance may lead to full batch scrapping. Aokai PTFE validates all these parameters for our semiconductor-grade tapes.
1. Raw material purity and low outgassing
Requirement
Why It Matters
Typical Limit
Low total halogen content (halogen-free preferred)
Halogens corrode aluminum bond pads and copper interconnects on chips
<900 ppm (halogen-free: <50 ppm each for Cl/Br)
Strict control of siloxane content
Siloxanes volatilize under heat and form insulating particles, causing bonding failure and poor electrical contact
Typically <500 ppm or non-detectable
Extremely low TVOC emissions
Volatile organics fog optical components and condense on wafer surfaces
<50 µg/g (varies by process)
Aokai PTFE note: Our semiconductor-grade PTFE tapes are formulated with high-purity PTFE and silicone PSA to minimize outgassing at typical processing temperatures (up to 260°C).
2. Particulate and ionic contamination control
Slitting and packaging: Must be completed in ISO Class 4 (or higher) cleanrooms to minimize particle shedding from the tape itself.
Ultra-low metal ion content: Alkali metals such as sodium (Na⁺) and potassium (K⁺) alter semiconductor electrical characteristics. Single metal ion levels are generally limited to <1 ppm.
Residue-free adhesive: No surface contamination or damage to hydrophobic passivation layers on wafers after tape peeling.
3. Anti-static performance
Surface resistivity: 10⁶ – 10⁹ Ω
Requirement: Stable static dissipative properties, uniform and consistent regardless of ambient humidity
Why: Prevents instantaneous high-voltage electrostatic discharge that destroys delicate chips
4. Chemical and dimensional stability
Chemical resistance: Withstand strong acids (hydrofluoric acid, nitric acid), strong alkalis (developer solutions), and organic solvents (acetone, isopropyl alcohol) – common in semiconductor wet processing.
Dimensional stability: Minimal thermal shrinkage under alternating high and low temperatures to eliminate masking misalignment and adhesive residue. Overall thickness tolerance controlled within ±5% or ±0.01 mm.
Aokai PTFE provides full documentation for our semiconductor-grade PTFE tapes, including cleanroom certification, ion chromatography (IC) reports for halogens, ICP-MS for metal ions, and GC-MS for outgassing. Contact us with your process requirements for a detailed datasheet.
If you require detailed specifications, application cases and customized solutions for our full product portfolio, including PTFE high-temperature cloth, PTFE high-temperature adhesive tape, PTFE high-temperature mesh belt, seamless heat press belt, single-sided PTFE fabric, high-temperature resistant conveyor belt and heat-resistant fiberglass cloth, please reach out to us via the contact information below:
