| HS Code | 692966 |
| Product Name | Winlite PFDT 1.52 mm |
| Product Type | Polyethylene Foam Double-Sided Tape |
| Thickness | 1.52 mm |
| Width | Various (e.g., 10 mm to 1000 mm) |
| Length | Various (e.g., 5 m to 50 m) |
| Color | White |
| Carrier Material | Crosslinked Polyethylene Foam |
| Adhesive | Acrylic |
| Density | 80 kg/m³ |
| Adhesion Strength | ≥ 8 N/25 mm |
| Temperature Resistance | -30°C to +80°C |
| Elongation At Break | ≥ 120% |
As an accredited Winlite PFDT 1.52 mm factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Winlite PFDT 1.52 mm is supplied in sealed polyethylene bags, 25 kg per bag, palletized and shrink-wrapped for safe transport. |
| Container Loading (20′ FCL) | One 20′ FCL container loaded with Winlite PFDT 1.52 mm, securely packed and stowed for safe transport. |
| Shipping | Winlite PFDT 1.52 mm ships as a rolled interlayer film on protective cores, wrapped in moisture-barrier packaging with desiccant. Use dry, ventilated containers to prevent condensation and deformation. Keep rolls upright or horizontally supported; avoid sharp impacts, direct sunlight, and extreme temperatures. Handle with clean gloves and lift equipment as needed. |
| Storage | Store Winlite PFDT 1.52 mm film in its original sealed packaging in a cool, dry, and dust-free area. Avoid direct sunlight, heat sources, and moisture. Maintain temperatures between 5–30°C with relative humidity below 60%. Lay rolls flat on shelves, free from compression or deformation, and use within the manufacturer’s recommended shelf life. |
| Shelf Life | Shelf life is typically 1 year from manufacture when stored in original packaging in a cool, dry place. |
In chemical-service valve production, Winlite PFDT 1.52 mm is dry-blended at ambient temperature without plasticizer. The granular resin is filled into a preform die at a uniform fill height because particle-size segregation above 0.15 mm across the fill depth can create density gradients and localized porosity. Press closure speed is limited to 5–10 mm/s during initial compaction to allow trapped air to escape before full pressure is applied. Peak preform pressure for unfilled resin is held at 15–25 MPa for 5–10 min per 100 mm of compact thickness. Press platens are checked for parallelism within 0.05 mm/m; deviation beyond that value causes uneven pressure transmission and incipient shear planes in the unsintered preform. Sintering is performed in an electrically heated air-circulation oven with spatial uniformity of ±2°C. Preforms are ramped from 200°C to 370°C at 60–80°C/h. The upper limit is critical because degradation products and the onset of depolymerization occur above 375°C, and an oven overshoot greater than 5°C can propagate an exotherm through the preform. Hold time at 370°C is 1 h/25 mm of maximum cross-section. Cooling is controlled at 5–10°C/h down to 200°C, then 20°C/h to ambient. Slow cooling yields 65–70% crystallinity; rapid cooling yields approximately 50% crystallinity and softer parts but greater creep under load. Filled compounds for valve seats use 15–25 wt% milled E-glass fiber, 5 wt% graphite, or 20–40 wt% bronze blended with the remainder PFDT resin; preform pressure increases by 5 MPa for filled grades because fillers reduce particle interlocking and require additional compaction. Sintered properties are tested per ASTM D4894 and ASTM D4895, with unfilled sintered parts typically above 29 MPa tensile strength and above 300% elongation. Terminal parts include ANSI B16.5 full-face gaskets in hydrochloric acid service, ball-valve seats, and pneumatic pump diaphragms.
| Preform cross-section | Oven ramp to 370°C | Hold time at 370°C | Cooling rate to 200°C | Approximate crystallinity |
|---|---|---|---|---|
| <10 mm | 100°C/h | 1.0 h | 20°C/h | 55–60% |
| 10–25 mm | 60–80°C/h | 1.5–2.5 h | 10–15°C/h | 60–65% |
| 25–50 mm | 40–60°C/h | 2.5–5.0 h | 8–12°C/h | 62–67% |
| >50 mm | 20–40°C/h | 5.0–8.0 h | 5–8°C/h | 65–70% |
Skived film from PFDT 1.52 mm is produced from pre-sintered cylindrical billets with wall thickness above 75 mm. The billet is cooled to below 50°C before mounting on a rotary skiving lathe. Blade geometry is set with a rake angle of 25–35°, a front clearance of 0.5–1.0°, and a sharpness maintained by diamond honing. Cutting speed is kept between 20 m/min and 60 m/min; above 60 m/min, blade chatter produces thickness variation greater than ±0.015 mm and surface roughness above Ra 0.9 µm. Film thickness ranges from 0.05 mm to 1.50 mm in a single pass. Thinner film below 0.05 mm is limited by the resin’s fibrillation resistance and the billet crystallinity; published data for this specific 1.52 mm PFDT configuration is limited, but granular PTFE of equivalent particle-size distribution typically requires crystallinity of 55–60% for stable thin-web skiving. Properties are verified per ASTM D882 for film tensile, with typical values above 29 MPa and elongation above 300%. Dielectric strength at 0.10 mm thickness exceeds 60 kV/mm per ASTM D149. Terminal film is die-cut into thread seal tape at 0.075–0.25 mm, capacitor dielectric films, and lined flange tape. Process conflict arises when billet crystallinity exceeds 65%: the film becomes too stiff, skiving vibration increases, and pinholes appear under 5 kV dielectric testing.
Because PFDT 1.52 mm granular resin does not form a true melt, rod and thick-wall tubing production is routed through ram extrusion. The extruder uses a hydraulic ram operating at 20–35 MPa to push the resin through a heated die. Die zones are maintained at 350–390°C, and the sintered section is controlled with ±3°C band heaters. Die land length is set at 10–15× the final diameter to provide sufficient back-pressure for consolidation. Output speed for unfilled rods is 10–30 mm/min. Extruded forms are cut to length, then post-sintered in a continuous oven at 360–375°C for 1 h/25 mm of wall thickness. Rod diameter capability spans 6–150 mm; thick-wall tube is limited to wall thickness above 3 mm because thin-wall ram extrusion without paste extender cannot maintain concentricity better than ±0.13 mm. Feedstock is dried to less than 0.05 wt% moisture before loading; moisture above that level produces steam porosity in the sintered rod and reduces tensile strength below 20 MPa. Products are tested per ASTM D792 for density 2.14–2.18 g/cm³ and ASTM D4895 for tensile. Terminal parts include rotary pump wear rings, reciprocating compressor seal rings, and electrical standoffs for high-voltage rail systems.
Envelope gaskets manufactured from PFDT 1.52 mm sheet require a skived or compression-molded film with thickness between 1.52 mm and 3.00 mm. The resin is selected when flange services contain 37% hydrochloric acid at 80°C, 50% sodium hydroxide at 100°C, or 85% phosphoric acid at 100°C. The fluoropolymer envelope is filled with a compressed synthetic fiber insert or a corrugated stainless steel core, and the outer film must have no pinholes. Stress relaxation is tested per ASTM F38 after 22 h at 100°C; retention above 65% is required for glass-lined flanges. Sealability is tested per ASTM F37 with nitrogen at 0.6 MPa, and leakage is monitored by pressure drop. Installation torque must not exceed 60 N·m on DN 50 flanges because excessive bolt load cold-flows the envelope and extrudes it beyond the raised face. The material’s upper service limit is 260°C for continuous exposure, but oxidizing acid services above 150°C require inert-gas blanketing to prevent surface oxidation. The resin is incompatible with molten alkali metals, fluorine gas at elevated pressure, and chlorine trifluoride; published data for this specific PFDT formulation is limited, but PTFE incurs rapid mass loss in those media. Terminal products include ISO 7005-1 lined pipe flanges, ASME B16.5 full-face gaskets, and PTFE-lined expansion joint bellows.
Semiconductor-grade PFDT 1.52 mm resin is converted only with virgin material; regrind is excluded because metal contamination from handling or machining can appear as extractable iron. Conversion is performed in an ISO 14644-1 Class 7 cleanroom or better. Compression-molded billets are machined wet with deionized water, and no external cutting lubricant is permitted. Degreasing uses isopropyl alcohol followed by 18 MΩ·cm deionized water rinse and ultrasonic cleaning at 40 kHz for 30 min. The sintered material is tested to SEMI F57 for ultrapure water extractables, with total organic carbon increase below 50 µg/L and surface metal extraction below 1 µg/m². After machining, the part is heat-cleaned at 120°C for 4 h to desorb volatile residues. Use is limited by mechanical creep at elevated clamp loads; flanges must be supported by metallic backing rings. Terminal parts include wet bench tanks, chemical distribution manifolds, and valve bodies for SC1/SC2 cleaning chemistries at 80–150°C.
| Application | Standard | Test condition | Typical result |
|---|---|---|---|
| Food contact | FDA 21 CFR 177.1550 | Extraction in heptane and water at 21°C | Pass |
| Food contact | EU 10/2011 | Overall migration | <10 mg/dm² |
| Electrical insulation | ASTM D257 | Volume resistivity at 500 V DC | >10¹⁸ Ω·cm |
| Mechanical | ASTM D4895 | Tensile strength / elongation | >29 MPa / >300% |
| Flammability | UL 94 | Vertical burn | V-0 |
For dry-food release contact, the 1.52 mm granular resin is compression molded into sheet and skived to 1.52 mm before mechanical fastening onto dough hopper walls, chute liners, and conveyor belt return slides. The nonporous surface maintains release with no added grease or silicone. Continuous service is limited to 260°C for the unfilled resin; intermittent excursions to 290°C are possible only for short oven cleaning cycles with no mechanical load. Compliance is established under FDA 21 CFR 177.1550, EU 10/2011, and NSF/ANSI 51 for food equipment materials. Washdown with sodium hypochlorite solution up to 200 ppm is acceptable, but abrasive cleaning pads with aluminium oxide grit above 80 µm scratch the surface and create bacterial entrapment sites. Surface roughness after skiving is held below Ra 0.8 µm per ISO 4287. Mechanical fasteners require slotted bolt holes because the sheet expands above 180°C by 0.12 mm/m. Terminal products include bakery release sheets, powder silo liners, and chute wear strips.
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Winlite PFDT 1.52 mm is supplied as a semi-crystalline polyvinylidene fluoride homopolymer sheet with a nominal thickness of 1.52 mm and a typical solid density of 1.78 g/cm³ when measured under ISO 1183-1:2019. The PFDT designation identifies a controlled-melt-viscosity extrusion grade intended for chemical process equipment linings, semiconductor wet-bench panels, and high-purity water distribution components. Stock formats include sheets at 1220 mm × 2440 mm and slit coils from 25 mm to 1524 mm; thickness tolerance is generally specified as ±5% or ±0.05 mm, whichever is greater, at 23 °C and 50% relative humidity. Published data specific to the Winlite PFDT lot range is limited; where exact lot data are not available, the values below are representative unfilled PVDF homopolymer data from ISO 12086-2 designations for preliminary screening and must be replaced by lot-specific certificates before cutting, forming, or hot-gas welding.
Thermoforming of the 1.52 mm gauge is constrained by the crystalline melting interval and the onset of thermal dehydrofluorination. The sheet surface temperature should be maintained between 200 °C and 220 °C. Below 195 °C, the crystalline phase remains insufficiently mobilized, producing stress whitening and incomplete replication of weld-prep profiles. Above 225 °C, bubble formation and local degradation occur in unshielded atmosphere, with carbonyl and conjugated double-bond formation detectable by FTIR after 180 s dwell. The practical forming window is therefore ≤ ±5 °C. A shuttle thermoformer with ceramic surface heaters and non-contact IR pyrometry at 8–14 μm wavelength is recommended. Batch-to-batch melt-flow variation of ±2 g/10 min at 230 °C/5 kg has been observed to shift sag time by 15–20%; the heat-soak curve must therefore be re-established for each lot rather than relying on fixed timer settings.
At 23 °C and 50% relative humidity, representative unfilled PVDF sheet of this gauge shows tensile yield strength near 50 MPa with elongation at yield 8–10% under ISO 527-2:2012. Flexural modulus is 2100 MPa under ISO 178:2019, and notched Izod impact strength is 8–12 kJ/m² under ISO 180:2019. Shore D hardness is normally 77–80. The continuous service temperature in air is 150 °C, with intermittent excursions to 160 °C limited by oxidative embrittlement. Water absorption after 24 h immersion under ISO 62:2008 is 0.03%. Long-term tensile creep of unfilled PVDF at 23 °C follows a log-linear relationship; at 10 MPa stress, the creep modulus at 10,000 h is approximately 800 MPa, falling to 300 MPa at 80 °C. Designers should apply a safety factor of 2.5 on long-term stress because published data for the exact PFDT configuration is limited.
Fire-safety classification for the 1.52 mm sheet is typically UL 94 V-0 at the minimum reported gauge; limiting oxygen index is 44% under ASTM D2863-19. Unexposed surfaces release hydrogen fluoride under fire conditions, and extraction systems must be designed for acidic gas and particulate fluorides. Combustion gas pH and HF yield are not suitable for applications requiring halogen-free cables or plenum-rated non-halogenated channels; the material must not be confused with polyetherimide or polyphenylene sulfide in those designs.
| Property | Winlite PFDT 1.52 mm | Unfilled PTFE | Unfilled FEP |
|---|---|---|---|
| Density, ISO 1183-1:2019 | 1.78 g/cm³ | 2.15 g/cm³ | 2.15 g/cm³ |
| Tensile strength, ISO 527-2 | 50 MPa | 25 MPa | 23 MPa |
| Flexural modulus, ISO 178 | 2100 MPa | 500 MPa | 600 MPa |
| Continuous service temperature | 150 °C | 260 °C | 204 °C |
| Hot-gas weldability | Yes, PVDF rod, 350 °C gas | No; PFA welding assistance required | Yes, FEP rod, 370 °C gas |
The 1.52 mm sheet is joined by hot-gas welding, butt fusion, or extrusion welding. Hot-gas welding uses a clean, dry gas stream at 350 °C, a 3 mm round or triangular PVDF rod, and a gas flow of 30 L/min. The weld zone reaches a hot-gas jointing temperature of 230–250 °C; weld factor measured by tensile test across the seam under ISO 527-2:2012 is generally 0.7 for manual work and 0.85 for automated high-speed tip welders. Solvent cementing is not applicable because PVDF is insoluble in common solvents at room temperature. Joint preparation requires removal of the 0.05 mm oxidized skin by mechanical scraping or plane milling immediately before welding. Relative humidity above 60% requires pre-drying at 80 °C for 4 h; entrapped moisture produces microporosity and reduces weld elongation at break below 5%. Spark testing at 15 kV DC after fabrication detects pinholes; acceptance criterion for chemical process equipment is no discharge for 5 s. Hydrotesting of lined vessels is typically performed at 1.3× design pressure for 30 min; the liner must be vented to atmosphere during test to avoid vacuum-induced collapse.
Immersion testing under ASTM D543-21, Method A, 7-day exposure at 23 °C, shows retention of tensile elongation above 90% in 98% sulfuric acid, 37% hydrochloric acid, and 50% sodium hydroxide. At 120 °C, continuous exposure to 50% sodium hydroxide is normally limited to 72 h based on retained elongation criteria. The sheet must not be placed in direct contact with primary amines, strong organic bases, or polar aprotic solvents such as dimethylformamide at elevated temperature, because dehydrofluorination and embrittlement occur. In mixed-acid service containing nitric acid and hydrofluoric acid, published data for this specific configuration is limited; qualification by ASTM D543-21 immersion with lot-specific thickness and weight-change measurement is required before use. Adhesive bonding to steel requires sodium-ammonia etch or atmospheric plasma treatment; untreated surfaces show lap-shear strength below 1 MPa. Epoxy adhesives with amine hardeners should not contact the PVDF surface directly because interfacial dehydrofluorination reduces peel strength after 60 °C hot-water exposure.
Dielectric strength through the 1.52 mm sheet is approximately 16 kV/mm under ASTM D149-20 at 60 Hz in oil; volume resistivity is 2 × 10¹⁴ Ω·cm under ASTM D257-14. The extractable cation load from unpigmented sheet yields a conductivity contribution below 1 μS/cm in 18 MΩ·cm deionized water after 24 h at 23 °C in dynamic extraction tests. These values support use in semiconductor equipment where ionic contamination must remain below SEMI F57-0601 limits, but the sheet is not inherently antistatic; surface static decay is not controlled without an antistatic coating, which itself would alter chemical resistance.
The central difference is weldability and rigidity. PTFE cannot be melt-processed or hot-gas welded without aggressive surface treatment and PFA interlayers; PFDT accepts direct hot-gas welding and thermoforming. PTFE and FEP provide higher continuous service temperatures of 260 °C and 204 °C, respectively, but lower mechanical load-bearing capacity and higher creep. PFDT is preferred where abrasion resistance, dimensional stability, and weldability at 1.52 mm gauge are more important than maximum temperature. FEP is more transparent and has lower extractables but is not rigid enough for self-supporting tank panels. The flexural modulus of PFDT is roughly 3–4 times that of unfilled PTFE or FEP; in cyclonic scrubber internals, this permits thinner wall sections without stiffener brackets. Compared with PVC and polypropylene, PFDT remains serviceable in strong acids at temperatures above 60 °C and below 150 °C, where PVC softens and polypropylene undergoes oxidative embrittlement. PFDT is not a direct substitute for high-temperature PFA or MFA in high-purity semiconductor processes above 150 °C.
Extrusion of the 1.52 mm sheet is performed on a single-screw extruder with L/D 30:1 and a barrier screw with compression ratio 2.5:1. Barrel set points range from 190 °C at the feed throat to 240 °C at the metering section, with die temperature 250 °C and melt temperature measured at the die lip 245 °C. Residence time above 260 °C must not exceed 10 min; after this, chain scission and discoloration become measurable. Melt pressure at the breaker plate is typically 150–200 bar; higher pressure with a blocked screen pack raises shear heating and can shift the effective melt temperature by 5 °C or more. The extrudate is polished through a vertical three-roll stack with middle roll temperature 90 °C and lower roll 70 °C; cooling too rapidly produces residual stress that later relaxes during thermoforming.
The compliance position is verified through standard designations rather than blanket statements. Restricted substances are assessed under RoHS Directive 2011/65/EU Annex II, with cadmium below 0.01 wt% and lead, mercury, hexavalent chromium, PBB, and PBDE below 0.1 wt% per homogeneous material. REACH SVHC candidate-list substances are controlled below 0.1 wt% per article under EC 1907/2006. Food-contact suitability is evaluated under FDA 21 CFR 177.2510 for polyvinylidene fluoride resins. Cytotoxicity for medical device components may be assessed under ISO 10993-5. The table below summarizes applicable standard designations.
| Requirement | Standard or regulation | Threshold or test condition |
|---|---|---|
| RoHS restricted substances | RoHS Directive 2011/65/EU Annex II | Cd 0.01 wt%; Pb, Hg, Cr VI, PBB, PBDE 0.1 wt% |
| REACH SVHC | EC 1907/2006 | 0.1 wt% per article |
| Flammability | UL 94 | V-0 at 1.52 mm thickness |
| Chemical resistance | ASTM D543-21 | 7-day immersion, 23 °C |
| Food contact | FDA 21 CFR 177.2510 | Extraction limits per section |
| Cytotoxicity | ISO 10993-5 | L929 cell line, extract dilution |
Operational boundaries include maximum continuous service temperature 150 °C, minimum ambient service temperature -40 °C without notch-sensitive impact loading, and maximum water-hammer surge pressure in lined steel of 1.5× the design pressure for 5 s cycles. The product must not be exposed to elemental alkali metals, fluorine gas, or concentrated hot sulfuric acid above 98% at temperatures above 60 °C. Incompatibility with amine-based additives, phosphate ester hydraulic fluids, and low-molecular-weight ketones should be checked by ASTM D543-21 before use; the absence of weight change alone is insufficient because selective extraction can embrittle the surface without mass loss. Packaging is typically interleaved with polyethylene film and sealed in moisture-barrier bags; storage should be on flat, rigid pallets at 15–30 °C and below 60% relative humidity to prevent surface condensation and out-of-plane distortion.
