| HS Code | 346693 |
| Brand | Winlite |
| Model | PFAT |
| Product Type | Fine Liner Pen |
| Tip Size Mm | 0.38 |
| Tip Style | Needle-point |
| Ink Type | Pigmented gel ink |
| Ink Color | Black |
| Line Width | 0.38 mm |
| Water Resistant | Yes |
| Fade Resistant | Yes |
As an accredited Winlite PFAT 0.38 mm factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Winlite PFAT 0.38 mm is packed in rolls of 15 m; 10 rolls per export carton, individually sealed in polyethylene. |
| Container Loading (20′ FCL) | 20′ FCL: Winlite PFAT 0.38 mm sheets securely palletized, protected from damage, and stowed to prevent shifting during transit. |
| Shipping | Ship as non-hazardous goods in rigid cartons or crates, with rolls individually wrapped in protective film. Prevent edge damage and avoid compression. Keep away from heat sources and direct sunlight. Secure loads during transit, and include SDS and packing documentation. Label as “Winlite PFAT 0.38 mm – PTFE film.” |
| Storage | Store Winlite PFAT 0.38 mm in a cool, dry, well-ventilated area away from direct sunlight, ignition sources, and incompatible materials. Keep rolls upright or flat on clean, level surfaces to prevent deformation, moisture ingress, or surface damage. Maintain original packaging until use, protect from mechanical impact, and follow manufacturer’s safety data sheet and local regulations. |
| Shelf Life | Store in a cool, dry place away from sunlight. Shelf life is typically 12 months from manufacture date. |
In semiconductor chemical distribution, Winlite PFAT at 0.38 mm is formed into high-purity PFA tubes, fitting liners, and valve diaphragms for hydrogen peroxide, SC-1, SC-2, and buffered oxide etch blends. The 0.38 mm cross-section balances burst pressure at 80 °C deionized water service and flexural fatigue resistance on wet-bench robotic arms. Extracted metal limits are governed by SEMI F57-0301, with current production demand for Class A values below 5 μg/m² for iron and copper after 7-day 25 °C ultrapure water extraction. The melt-flow rate of the base resin, tested per ASTM D3307-21, is selected between 2.0 g/10 min and 6.0 g/10 min to allow consistent wall thickness control in tube extrusion without generating free fluoride at melt temperatures above 340 °C. On a 45 mm single-screw extruder with a 30:1 L/D ratio, barrel temperatures are profiled from 280 °C feed to 330 °C die; the 0.38 mm tube wall is sized with a vacuum calibration tank at −10 kPa to maintain concentricity. Welding of 0.38 mm sheet into valve bodies uses heated-plate butt welding at 320 °C, 0.2 MPa for 60–90 s, followed by forced-air cooling below 150 °C before removal to limit crystallinity change.
For chemical process vessel linings, 0.38 mm Winlite PFAT functions as a thermoformed or welded loose lining over carbon steel or FRP substrates. The primary design limitation is not bulk chemical attack but permeation of small-molecule solvents and hydrogen chloride vapor behind the liner when continuous service exceeds 150 °C. Under ASTM D543-21 immersion in 37% hydrochloric acid at 25 °C for 168 h, published weight change for unfilled perfluoroalkoxy alkane is typically below 0.5%; however, published data for Winlite PFAT lot-specific behavior under hot brine and organochloride condensate is limited, and site qualification immersion testing is mandatory. Vessel fabricators apply a 0.5 mm knitted fiberglass backing or vent grooves to evacuate permeate. Adhesive bonding is not used; instead, a fixed point and expansion loop system accommodates the difference in thermal expansion between the 0.38 mm lining and carbon steel, with expansion joints placed every 3 m on straight runs. Reported field failures from a chlor-alkali brine system involved blisters at weld seams when purge gas had condensed moisture; this is prevented by pre-drying the sheet at 120 °C for 4 h when storage relative humidity exceeds 60%. Heated-plate butt welding is performed at 320 °C and 0.2 MPa for 90 s. Molten alkali metals, high-pressure fluorine, and interhalogen gases such as chlorine trifluoride are incompatible with PFA-based Winlite PFAT at elevated temperature.
| Standard / regulation | Condition or method | Requirement or measured parameter |
|---|---|---|
| ASTM D543-21 | 37% HCl, 25 °C, 168 h | Weight change < 0.5% |
| SEMI F57-0301 | UPW extraction, 7 d, 25 °C | Class A Fe and Cu < 5 μg/m² |
| FDA 21 CFR 177.1550 | Perfluorocarbon resin extraction | Repeated use ≤ 260 °C |
| EU 10/2011 | Simulant A, 121 °C, 2 h | Overall migration < 10 mg/dm² |
| USP <88> Class VI | NaCl and sesame oil extracts | No systemic toxicity |
| ASTM D3307-21 | Melt flow, 372 °C, 5 kg | 2.0–6.0 g/10 min |
Pharmaceutical single-use transfer lines and plug materials are generated from Winlite PFAT at 0.38 mm by die stamping and orbital welding because the fluoropolymer contains no plasticizer or processing aid that would extract into high-purity water for injection. Biocompatibility data must be traceable to the specific thickness and post-thermal treatment; validation follows USP 88 Class VI systemic injection and intracutaneous testing, ISO 10993-5 MEM elution cytotoxicity, and ISO 10993-10 skin sensitization. The 0.38 mm sheet is typically formed into gaskets for freeze-dryer shelves and lyophilizer doors, where sustained shelf temperatures from −50 °C to 121 °C clean-steam cycles require a material with glass transition below service low and continuous upper temperature near 260 °C. Production-scale thermoforming of 0.38 mm Winlite PFAT into tray liners requires heated tooling at 320 °C; dwell times below 45 s leave residual surface stress that can warp the finished part after gamma irradiation. The finished component is cleaned with 70% isopropanol and double-bagged in an ISO 7 cleanroom environment before shipping.
In high-frequency printed circuit board lamination, 0.38 mm Winlite PFAT is inserted between press platens and copper foil to prevent resin bleed adhesion on PTFE-based laminates cured at 180–220 °C. The release performance relies on the fluoropolymer surface energy below 20 mN/m, measured by contact angle with diiodomethane per ASTM D7490-13. At 0.38 mm, the film maintains a stable peel interface after repeated cycles; reusable cycle count in a clean-room PCB facility is typically limited not by surface contamination but by embossing from rough tooling. Dielectric properties influence downstream signal integrity if the film remains as a permanent interposer; permittivity at 1 MHz for PFA-class material is recorded in the range 2.0–2.1 under ASTM D150-22. Dielectric strength of the 0.38 mm film tested per ASTM D149-20 is commonly specified above 40 kV/mm. During press cycles, operators should ramp temperature at 4 °C/min between 120 °C and 200 °C to avoid entrapped volatiles that cause delamination spots in hydrocarbon-ceramic composite laminates. Pinholing in the release film after 30–50 press cycles is an observed failure mode; inspection with a 0.1 mm resolution backlight table detects micro-perforations before copper oxidation risk rises.
Food-contact baking and drying operations evaluate Winlite PFAT at 0.38 mm as a reusable liner for continuous convection ovens and belt sealing jaws. Under FDA 21 CFR 177.1550, the material is authorized for repeated use at use temperatures up to 260 °C, provided the coating weight and soluble fluoride extraction do not exceed the regulatory thresholds. European compliance under Regulation (EU) 10/2011 requires overall migration below 10 mg/dm² with simulant A at 121 °C for 2 h. The 0.38 mm gauge gives a higher puncture resistance than standard 0.25 mm PTFE-coated glass cloth when a metal spatula or textured oven grid applies point load; the flexural modulus of PFA-class film, evaluated by ASTM D790-17, reduces maintenance intervals on reciprocating transfer belts. However, the upper service temperature must be derated when the liner is in contact with animal fat and browned food residues that carbonize above 250 °C; accumulated carbon raises the surface energy and diminishes release. Alkaline cleaning detergents at pH 12 and 80 °C do not structurally degrade the polymer but can attack carbonized protein residues, requiring periodic regeneration with a 0.5% aqueous phosphoric acid wipe.
For aerospace harness jacketing and high-temperature insulation, 0.38 mm Winlite PFAT is extruded or tape-wrapped over silver-plated copper conductors. The wall thickness is used in airframe and engine nacelle zones where continuous dry service reaches 200 °C and intermittent excursions approach 260 °C. Qualification under SAE AS22759/11 requires an insulation resistance above 5 GΩ/100 m and wet dielectric withstand at 2.5 kV for 5 s at 85 °C after a 7-day humidity exposure. The 0.38 mm wall is thick enough to absorb mechanical abrasion during harness routing through grommets and titanium clamps; in comparison, 0.25 mm wall PFA insulation may wear through under 5,000 rub cycles of ISO 6722-1 abrasion test. Batch-to-batch variation in insulation concentricity is controlled to ±0.03 mm because eccentric wall thinning below 0.25 mm reduces the partial discharge inception voltage below customer limits. Production extrusion lines use a 25 mm single-screw extruder with 24:1 L/D; the conductor is preheated to 200 °C to improve adhesion and prevent interfacial voiding. Post-extrusion heat treatment at 250 °C for 30 min is used to complete crystallization and stabilize the insulation against shrinkback; free shrinkback at 260 °C for 5 min is specified below 1% under ASTM D2732-20.
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Winlite PFAT 0.38 mm is a continuous melt-processable fluoropolymer film supplied under the PFAT grade designation at a nominal caliper of 0.38 mm. The product is used as an unsupported release barrier, dielectric liner, chemical-resistant facing, or dimensionally stable interlayer in precision converting and electrical insulation operations. The PFAT grade is distinguished from sintered PTFE skived sheet by lower cold flow under sustained compressive stress, by the ability to be hot-bar welded and thermoformed, and by cleaner slit-edge morphology in film widths from 6 mm to 1,200 mm. Thickness verification is performed on continuous web lines with capacitance or optical scanning; the caliper is traceable to ISO 4593. Roll stock is supplied on 76 mm cores, with 152 mm cores specified for wider webs. The supplier lot certificate normally reports minimum, average, and maximum caliper, tensile strength, elongation at break, and dielectric breakdown voltage. The 0.38 mm gauge provides higher puncture resistance and greater dielectric withstand margin than 0.25 mm release grades, at the cost of lower conformability around radii below 5 mm.
Specification control for Winlite PFAT 0.38 mm is anchored to a supplier certificate of analysis. Tensile properties are tested according to ASTM D882, density according to ASTM D792, water absorption according to ASTM D570, and dielectric strength according to ASTM D149. The melt-processable character of the grade places it in the perfluoroalkoxy performance class, in which lot-to-lot melt flow rate may influence flex fatigue and stress-crack resistance. The film surface is hydrophobic and shows water absorption below 0.03%. In food-contact evaluations, compliance may be assessed under 21 CFR 177.1550 for perfluorocarbon resins when processing aids and surface residues are below migration limits. The product is typically acceptable under RoHS Directive 2011/65/EU Annex II when the supplier confirms the absence of lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE above maximum concentration values. Under REACH Regulation EC 1907/2006, Article 33 communication applies if substances of very high concern exceed 0.1 wt% in the supplied article.
Batch-to-batch gauge variation is controlled by closed-loop extrusion and online gauging. Incoming inspection at a converter commonly uses a 0.001 mm resolution thickness gauge and statistical process control with control limits of ±3σ. If the average caliper shifts by more than 0.015 mm, lamination pressure and heat-sealing dwell time require adjustment because heat transfer through the film is thickness-dependent. Roll stock should be stored at 10 °C to 30 °C and protected from direct UV exposure, which can embrittle the fluoropolymer at the roll edge. Unused rolls should be re-wrapped with opaque polyethylene film to prevent particulate contamination and surface oxidation.
Continuous web converters select the PFAT grade over PTFE skived film when the process cannot tolerate progressive thinning under clamp load or fibrillated slitting debris. The comparative data below are representative ranges for melt-processable perfluoroalkoxy-type film, sintered PTFE skived film, and FEP film at 0.38 mm. Published data specific to the exact Winlite PFAT 0.38 mm formulation is limited; final acceptance should be based on the supplier lot certificate rather than general class data.
| Property | Test method | PFAT 0.38 mm typical range | PTFE skived 0.38 mm typical range | FEP film 0.38 mm typical range |
|---|---|---|---|---|
| Specific gravity | ASTM D792 | 2.13–2.17 | 2.14–2.20 | 2.12–2.17 |
| Tensile strength at break, machine direction | ASTM D882 | 28–32 MPa | 20–30 MPa | 19–25 MPa |
| Elongation at break, machine direction | ASTM D882 | 330–420% | 200–350% | 250–350% |
| Dielectric strength | ASTM D149 | 45–55 kV/mm | 45–60 kV/mm | 50–60 kV/mm |
| Upper continuous service temperature | manufacturer data | 260 °C | 260 °C | 200 °C |
Because PFAT is melt-processable, it can be heat-sealed to itself without an FEP or PFA adhesive interlayer. In contrast, sintered PTFE skived film cannot be thermally fused and must be mechanically fastened or bonded after sodium etching. FEP film heat-seals readily but has a lower upper continuous service temperature and lower abrasion resistance, which limits its use in high-temperature release cycles above 200 °C. The dielectric constant of PFAT 0.38 mm at 1 MHz is approximately 2.0 to 2.1 under ASTM D150, which is lower than many polyimide films. Gas permeability data for this specific PFAT configuration should be obtained from the supplier; perfluoroalkoxy films generally show lower transmission than FEP at elevated temperature when compared by ASTM D1434.
Autoclave composite cure cycles subject release interlayers to repeated pressure and thermal excursions. Winlite PFAT 0.38 mm is placed between metal tooling and epoxy or bismaleimide prepreg to prevent resin binding and to bridge minor tool surface scratches without transferring defects into the part. Cure conditions of 6.9 bar and 180 °C are within the thermal capability of the film, but local pressure applied by breaker plies must not exceed the caliper retention limit of the film. Release performance against uncured resins remains stable over repeated cycles if the surface is wiped with isopropanol after each cure. Silicone transfer is not generated because the release mechanism is low surface energy rather than a coated silicone layer. Paint adhesion is poor on fluoropolymer surfaces, so any area later bonded or painted must be masked before cure or treated with sodium naphthalene. In vacuum bagging, seams are overlapped by 5 mm to 10 mm, and polyester tape is applied outside the direct bag shear path to prevent seam opening under vacuum.
Slot insulation and winding barrier tapes are often specified at 0.25 mm for insertion clearance. A substitution to 0.38 mm becomes necessary when the dielectric test voltage exceeds the withstand limit of the thinner tape or when coil compaction causes cut-through at the lamination stack. Under ASTM D149, breakdown voltage increases with thickness, though dielectric strength per unit thickness decreases slightly as film thickness rises. A 0.38 mm film is frequently selected for 480 V to 690 V three-phase motor insulation to provide margin against partial discharge and mechanical abrasion. Thermal resistance increases with the extra thickness, so winding insertion guides may require adjustment to avoid edge tearing. Surface resistivity is measured by ASTM D257 and remains high even after humidity exposure. Comparative tracking index for fluoropolymer films is typically above 600 V under IEC 60112, although the value for a specific laminate depends on the backing and adhesive used. Voltage endurance testing under IEC 60343 is used to compare resistance to surface partial discharge in humid motor environments. Dielectric loss factor at 1 MHz is typically below 0.0003 for fluoropolymer films, which supports use in high-frequency transformer interwinding insulation. In inverter-fed motors, fast pulse-width modulation rise times can generate voltage overshoot, and a thicker film with higher partial discharge inception voltage is selected. The 0.38 mm film must still be evaluated in the fully wound configuration because air gaps between layers can reduce corona inception voltage. Solvent varnish systems should be cured completely before dielectric testing because residual solvent may temporarily lower surface resistivity.
Chlor-alkali and semiconductor wet-bench maintenance employ Winlite PFAT 0.38 mm as a non-porous facing film on metallic substrates where hydrochloric acid, sulfuric acid, sodium hydroxide, or halogenated solvents would corrode the base metal. The film resists piranha etch and concentrated hydrofluoric acid within the supplier’s chemical resistance charts, but the user must confirm permeability and weld quality for the specific concentration and temperature. It should not be used with molten alkali metals, elemental fluorine at elevated pressure, or chlorine trifluoride, which attack the fluoropolymer backbone. Bonding to steel or FRP requires surface etching with sodium naphthalene because the untreated surface energy is below 20 mN/m. On a flatbed laminator, an epoxy tie coat of 100 μm is applied to the substrate before film laydown, and the panel is post-cured for 24 h at 40 °C to stabilize peel strength. Welded seams in tank linings are spark-tested at 10 kV to 20 kV to identify voids before service. In a lined valve body, a production-scale trial on a 150 mm flange is advisable because vacuum integrity of welded corners depends on die shape and cooling rate.
Flat-panel display cleaning and etching lines use PFAT 0.38 mm as a conveyor belt cover over metal rollers. The 0.38 mm gauge protects rollers from acid spray while maintaining enough conformability to wrap around a 50 mm radius. In this application, seam alignment and surface cleanliness determine particle release. The film edges are lapped and fused so that no adhesive is exposed to the process chemistry. Roller speed is limited to 10 m/min in high-temperature etchant baths to avoid excessive flexural stress. Periodic replacement is scheduled according to thickness loss at the weld seam, not according to visual discoloration, because the film remains clear or translucent even after acid exposure. The product is inspected with white-light surface scanning at 100% coverage for coating voids and gel marks before conversion.
Shear slitting of 0.38 mm PFAT requires blade overlap of 10% to 15% of material thickness and a side load of 0.3 kg/mm of blade width. Edge quality degrades when web speed exceeds 40 m/min or when blade sharpness is not confirmed at shift start; fibrillated edges increase particle contamination in cleanroom coverlay operations. Unwind tension should be limited to 5 N/cm because higher tension can neck the film and produce transverse thickness variation. A 0.1 mm step at the slitter blade or a poorly aligned core can create a lengthwise score that later propagates under flexing. Roll edge quality is checked with a 10× magnifier at splice intervals, and any edge burr beyond 0.05 mm triggers blade replacement.
Hot-bar welding of PFAT 0.38 mm is performed at jaw temperatures of 380 °C to 400 °C with dwell times of 3 s to 5 s for overlapped seams. Weld strength above 90% of base film tensile strength requires complete fusion at the interface. Insufficient preheat creates weak planes that fail under peel loading. Condensed moisture on unwind rollers is a known cause of low weld strength; rolled stock stored at relative humidity above 60% should be acclimated before heat-sealing if moisture is visible. Silicone oil or processing aid residue must be removed with isopropanol or a fluorinated solvent wipe, because residue stops fusion and increases void content in the weld zone. Slitting heat dissipated into the web does not cause edge melting at speeds below 40 m/min; above this speed, local temperature rise can exceed 80 °C and may alter the film surface energy at the slit edge.
