| HS Code | 938315 |
| Product Name | Winlite PFVT 0.76/1.14 mm |
| Material | Polyvinyl butyral (PVB) |
| Form | Roll film for glass lamination |
| Thickness Available | 0.76 mm and 1.14 mm |
| Color | Clear/transparent |
| Light Transmittance | ≥88% |
| Haze | ≤1% |
| Tensile Strength | ≥20 MPa |
| Elongation At Break | ≥250% |
| Adhesion To Glass | 8-12 N/mm |
| Moisture Content | ≤0.5% |
| Glass Transition Temperature | Approx. 30°C |
| Application | Laminated safety glass for architectural glazing |
As an accredited Winlite PFVT 0.76/1.14 mm factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Winlite PFVT 0.76/1.14 mm is packaged in 25 m rolls, 12 per carton, individually wrapped. |
| Container Loading (20′ FCL) | Winlite PFVT 0.76/1.14 mm loaded in 20′ FCL as palletized rolls, evenly distributed and secured to prevent shifting. |
| Shipping | Winlite PFVT 0.76/1.14 mm is packaged on sturdy pallets, protected with edge guards and stretch wrap for safe transport. Keep dry, avoid direct sunlight, and store upright during shipping. It is generally non-hazardous; include SDS, batch documentation, and follow standard handling and local transport regulations. |
| Storage | Store Winlite PFVT 0.76/1.14 mm in its original packaging in a dry, well-ventilated indoor area, protected from direct sunlight, rain, and excessive humidity. Keep rolls upright on a clean, level surface, away from sharp objects and chemicals. Avoid stacking excessively to prevent deformation, and handle with care to preserve the foil facing and product integrity. |
| Shelf Life | Shelf life is typically 12 months from manufacture date when stored unopened, dry, cool, and protected from sunlight and moisture. |
Winlite PFVT 0.76 mm sheet is converted into 1 200 mm × 2 400 mm panels for bonded and brick-backed internal linings in hydrochloric acid storage vessels operating at 37% concentration and 85°C continuous service. The sheet is cut on a CNC flatbed router with a 6 mm cemented carbide compression bit at 18 000 rpm and 4 200 mm/min feed; a 0.15 mm sawtooth kerf allowance is added to each weld edge to accommodate hot gas welding shrinkage. Hot gas welding is performed with a 3.2 mm PFA welding rod at 340–360°C using a Leister TRIAC S or equivalent with travel speed regulated to 80–110 mm/min; weld root bend tests must show no delamination at 180° over a 25 mm mandrel. The bonded system is specified under EN 14879-1:2020 for organic lining systems, with substrate preparation to Sa 2½ per ISO 8501-1 and surface dust below 2 mg/m² per ISO 8502-3. For brick-backed configurations, a potassium silicate mortar is applied over the Winlite PFVT membrane at a formulation addition ratio of 10–12 wt% silica filler to binder and a 3:1 powder-to-liquid ratio; silica content above 12 wt% leads to shrinkage cracking during the 24-hour ambient cure and is not permitted. The downstream process includes panel cutting, hot gas welding, spark testing at 15 kV/mm, vacuum box testing at −25 kPa, and final hydrotest at 1.5 times design pressure. Terminal product types are hydrochloric acid storage tanks, sulphuric acid pickling tanks, chromic acid plating solution containment liners, and scrubber internals. The operational boundary is set at 120°C for bonded adhesive systems; above this temperature, only loose or mechanically fastened liners should be considered.
Production-scale failures observed on actual lining lines are dominated by weld-root porosity caused by gas flow below 25 L/min or travel speed above 130 mm/min; both conditions produce insufficient interdiffusion and are detected only by vacuum box testing. The 0.76 mm grade is preferred for small-diameter manways and nozzle sleeves because it forms to 45 mm radius bends without local thinning; the 1.14 mm grade is reserved for large flat sidewalls where deflected panel movement under vacuum must stay below 3 mm over 1 000 mm span. Batch-to-batch thickness variation is held to ±0.05 mm, but incoming sheets must be re-measured with a non-contact laser gauge after 48-hour conditioning because moisture adsorption on unetched surfaces can alter weld melt flow by 2–4%.
Fabrication of homogeneous flange gaskets from 1.14 mm Winlite PFVT begins with CNC kiss cutting on a flatbed drag knife machine at 4 000 mm/min, with inner diameter burr height held below 50 µm to prevent stress concentration during bolt-up. The material is used unfilled; the formulation addition ratio is therefore 0 wt% filler, but when an envelope construction is required for glass-lined flanges, a 0.76 mm virgin sheet is wrapped over a 1.5 mm compressed aramid fibre core at a 1.5:1 envelope-to-core thickness ratio. Compliance is verified to ASME B16.21-2021 for nonmetallic flat gaskets and EN 13555:2021 for sealability. Installation on raised-face flanges requires surface finish 3.2–6.3 µm Ra, gasket stress of 18–22 MPa, and torque control within ±5% of calculated bolt stress. The downstream process is completed by cut gaskets being cleaned in 99.9% isopropyl alcohol and packaged in polyethylene film to prevent particulate contamination. Terminal product types are chlorine electrolyser flange gaskets, sodium hydroxide piping gaskets, hydrochloric acid transfer line gaskets, and sodium hypochlorite pump flange seals. For creep-sensitive service above 100°C, the 1.14 mm grade is preferred because thicker cross-section reduces gasket relaxation under 20 MPa initial stress; published multi-cycle creep data for this specific sheet pair is limited, so validation by EN 13555 room-temperature and 100°C tests is required before final gasket stress limits are fixed.
| Check | Standard | Acceptance |
|---|---|---|
| Thickness tolerance | ISO 13000-1:2021 | ±0.05 mm |
| Sealability at 40 bar He | EN 13555:2021 | ≤1.0×10⁻⁴ mg/(m·s) |
| Compression set 22 h at 100°C | ASTM D395-18 Method B | ≤35% |
| Flange dimensions | ASME B16.21-2021 | Class 150 and Class 300 flat ring |
Dielectric breakdown of Winlite PFVT 0.76 mm is verified at 25 kV/mm by ASTM D149-20 after 48-hour conditioning at 23°C and 50% RH; the 1.14 mm grade is selected for phase barriers in medium-voltage switchgear to meet IEC 60664-1:2020 pollution degree 2 clearance and creepage requirements. The sheet is cut with a 50 W CO₂ laser at 10.6 µm wavelength and 150 mm/s traverse speed, with extraction at 0.8 m/s face velocity to remove hydrogen fluoride; cut edges are then rounded with 240-grit alumina abrasive to reduce partial discharge initiation. In transformer slot liner fabrication, a 28% solids polyesterimide impregnating varnish is diluted with xylene at a 4:1 resin-to-solvent ratio for the first coat; the varnish solids formulation addition ratio is controlled between 27% and 30% to avoid excessive viscosity during vacuum impregnation at 0.08 MPa. The downstream process includes die cutting, edge rounding, insertion into busbar assemblies, varnish impregnation, and 2-hour cure at 150°C. Terminal product types are air-insulated bus duct separators, dry-type transformer slot liners, and motor terminal block phase barriers. Operational boundary: continuous service above 260°C should not be specified because thermal oxidation of the sheet surface may occur, even though dielectric strength remains measurable.
Acid exhaust plenum liners are thermoformed from 1.14 mm Winlite PFVT on a vacuum forming machine with aluminium tooling heated to 200°C; the sheet surface temperature is maintained at 330–335°C by infrared pyrometer, and a sag window of 35–45 mm over a 600 mm draw depth is used before vacuum engagement. The PFA welding rod formulation for joining formed sections contains 0.5–1.0% pigment-grade TiO₂; the addition ratio is limited to 1.0% because higher TiO₂ loading interferes with interdiffusion at the 345°C weld interface. Welding is performed with a 4.0 mm rod at 340–360°C and 90–120 mm/min travel speed, followed by spark testing at 15 kV/mm and pressure decay testing at −30 kPa for 10 minutes with a maximum pressure rise of 0.15 kPa. Compliance with semiconductor fabrication requirements is addressed through SEMI S2 for equipment safety, NFPA 318 for cleanroom fire protection, and ASTM E84-21 for surface flame spread, with the sheet meeting Class A flame spread index ≤25 and smoke developed index ≤450 when specified. The downstream process includes thermoforming, CNC trimming, hot gas welding, spark testing, pressure decay testing, and cleanroom packaging. Terminal product types are acid exhaust plenums, wet bench liners, wafer cleaning bath covers, and spent solvent drain trays. Amine-cured epoxy adhesives are not recommended for bonded joints because residual amine compounds can migrate to the sheet interface and reduce adhesion.
On manufacturing lines, the most frequent thermoforming defect is corner thinning below 0.65 mm when the sheet surface temperature exceeds 335°C or when vacuum draw rate exceeds 0.6 bar/s; parts with corner thickness below 0.65 mm are rejected by ultrasonic A-scan. The 1.14 mm starting blank is preheated in a two-stage oven at 200°C and 330°C for 15 minutes to equalise core temperature without surface oxidation.
Food-contact release conversion of Winlite PFVT 0.76 mm is limited to repeated-use non-stick applications up to 260°C, with compliance assessed under EU Regulation 10/2011 and applicable FDA clearances for the specific fluoropolymer. No release agent, plasticiser, or filler is added during conversion; the formulation addition ratio is explicitly 0 wt% external lubricant. The sheet is cut on a 300 MPa waterjet machine with 1.2 mm nozzle diameter and 120 mm/min cutting speed, then thermally stress-relieved in a convection oven at 260°C for 3 hours to reduce residual stress before use. The downstream process includes waterjet cutting, edge trimming, stress relieving, degreasing with 99.9% isopropyl alcohol, and final inspection under 500 lux illumination for surface defects larger than 0.2 mm. Terminal product types are non-stick bakery tray liners, heat-seal release sheets for flexible packaging, and conveyor belt covers for chocolate moulding lines. Operation above 260°C is not recommended for food contact because decomposition products may form and migration testing per EU 10/2011 becomes mandatory.
At service temperatures below −40°C, elastomer gaskets stiffen and lose compression recovery; 0.76 mm Winlite PFVT is substituted in unhoused flange seals for liquid oxygen and nitrogen transfer lines. The fabrication uses no adhesive or filler, but when a rigid backing ring is required, a 1.5 mm 304L stainless steel ring is inserted between two 0.76 mm Winlite PFVT plies at a 1:1:1 ply ratio. Compliance is governed by ASME B31.3 for process piping and CGA G-4.4 for oxygen system cleanliness; cleaning before installation uses 99.9% isopropyl alcohol with particle count below 1 000 particles/m³ at 0.5 µm. The cut gasket is tested according to EN 13555:2021 for leakage at 40 bar helium; operational boundary is established at 40 bar and −196°C, above which blowout resistance decreases. The downstream process includes laser cutting, solvent cleaning, particle counting, gasket assembly with backing ring, and leak testing. Terminal product types are liquid oxygen flange gaskets, LNG sampling probe seals, and cryogenic valve bonnet gaskets. For oxygen service, hydrocarbon contamination on the cut edges must remain below 100 mg/m², and any marking ink must be oxygen-compatible.
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The product designation Winlite PFVT identifies a polymeric pressure-sensitive adhesive tape family in which the suffix 0.76/1.14 mm denotes two nominal backing thicknesses: 0.76 mm and 1.14 mm. The dimensional pair is part of the ordering key and should not be interpreted as roll width, core diameter, or adhesive coating weight. On production-scale busbar and cable-joint assemblies, the product is used where a single-wrap polymer layer must provide a measurable dielectric barrier, cut-through resistance, and a strippable or repairable covering. In comparison with conventional PVC electrical insulation tape supplied at 0.15 mm to 0.19 mm nominal thickness, the PFVT gauge range shifts the material toward bulk dielectric build-up and mechanical protection rather than lightweight identification and jacketing. Published data for this specific PFVT configuration is limited; therefore, qualification under ASTM D1000, IEC 60454-2, and the applicable system-level insulation coordination standard is required before approving the material for production use.
Tape thickness controls bending stiffness, edge-lift behaviour, unwind tension, overlap edge height, and electric field distribution at the tape edge. The 0.76 mm gauge is typically assigned to wrapped joints with small bend radii and to automated wrapping heads that cannot tolerate high web stiffness. The 1.14 mm gauge is assigned when a single pass must build significant insulation thickness, when screw-head cut-through is the dominant mechanical risk, or when the conductor geometry is broad enough that conformability is not limiting. Thickness verification should be carried out with a dead-weight micrometer under ASTM D3652/D3652M at 23 ± 2 °C and 50 ± 5 % RH; the measurement is taken on the backing excluding release liner and adhesive transfer. A gauge that is outside the manufacturer’s declared tolerance changes the wrap sequence and can alter insulation coordination even though the tape chemistry remains unchanged. On spiral wrapping machines with 25 mm to 50 mm tape heads, changing from 0.76 mm to 1.14 mm increases web stiffness and typically requires lower unwind back tension; otherwise edge buckling can propagate from the overlap edge and generate a non-uniform lap. For a 50 % overlap schedule, one pass of 0.76 mm tape yields a theoretical 1.52 mm double-layer build, while one pass of 1.14 mm tape yields 2.28 mm. This arithmetic is often the primary reason for selecting the heavier gauge in low-voltage busbar assemblies.
Because PFVT is applied to copper and aluminium surfaces in switchgear, motor terminal boxes, and busbar trunking, substrate preparation controls final peel adhesion more than the visual surface gloss of the conductor. Oxidised copper and weathered aluminium should be wiped with a clean-room-grade solvent such as isopropyl alcohol and allowed to flash off before tape placement. Where the oxide layer is heavy, a nonwoven aluminium-oxide pad can be used, but it may create scoring on soft copper busbar faces; a 1.0 mm to 1.5 mm edge break is usually more effective for minimising tape lift at corners. Adhesion should be measured after 24 h dwell at 23 ± 2 °C and 50 ± 5 % RH using ASTM D3330/D3330M Method A or B depending on the construction. Production trials on existing PVC tape lines show that a gauge increase often reveals a limitation in the dancer-arm payout system rather than in the adhesive itself; the higher modulus of the thicker PFVT backing can produce acceleration-sensitive tearing if the unwind tension is not controlled by a servo-driven constant-tension head. Operators should not compensate by increasing tape wrap tension at the point of application, because this stretches the backing and reduces the effective thickness of the deposited layer.
Electrical qualification of PFVT should be based on measured dielectric breakdown after conditioning at 23 ± 2 °C and 50 ± 5 % RH under ASTM D1000. The electrode configuration, whether cylindrical or parallel plate, must be recorded because the measured breakdown path is influenced by the test geometry. A favourable dielectric breakdown result on a flat sample does not automatically satisfy the creepage and clearance requirements of IEC 60664-1:2020; the final busbar or cable-joint assembly remains subject to system-level insulation coordination. Chemical exposure cannot be predicted from the polymer family alone because the backing and adhesive may respond differently. Before use in transformer oil, glycol-based coolant, or metalworking fluid environments, immersion screening should be performed under ASTM D543-21 with changes in tensile strength, elongation, and peel adhesion recorded after 7-day and 30-day exposure. A peel adhesion loss that drops below the acceptance limit of IEC 60454-2 for the intended class indicates incompatibility. Ketones, chlorinated solvents, and some glycol ethers can swell or plasticise vinyl adhesives; the PFVT grade should not be assumed to resist these fluids solely because it is specified as an electrical tape. For UV and weathering exposure, ASTM G154 and ISO 4892-2 provide comparative test methods, but the tape should not replace UV-stable covering systems unless supported by long-term weathering data from the manufacturer.
Replacing 0.76 mm tape with 1.14 mm tape changes both the thermal resistance of the finish and the edge geometry of the wrapped busbar. The thicker backing reduces the surface heat transfer relative to the thinner construction; for high-current busbar runs, a thermal derating calculation should be performed using the measured thermal conductivity of the backing under ASTM C177 or ISO 8302. The benefit is a reduction in the number of wraps required for a given total build-up. A total build-up of 2.28 mm can be achieved with two wraps of 1.14 mm tape at 50 % overlap, whereas the same build-up requires three wraps of 0.76 mm tape. Fewer wraps reduce the number of spiral edge interfaces, which is advantageous in partial-discharge-sensitive low-voltage assemblies, but the stiffer 1.14 mm backing can bridge concave fillets at bolted lugs and trap air pockets unless heat is applied or the tape is slit to a narrower width in the transition zone. The 0.76 mm gauge therefore remains the preferred option on braided flexible connectors, motor terminal boxes, and curved busbar risers; the 1.14 mm gauge is preferred on straight horizontal busbar runs and large connection pads where flat-surface geometry dominates.
On an automated harness line running at low to moderate throughput, the acceptance test for PFVT wrapping should include a visual overlap check, a wrap continuity check, and a dielectric high-potential test on the wrapped assembly. The high-potential test voltage is not derived from tape thickness alone; it is derived from the equipment standard and the intended overvoltage category, with many low-voltage assemblies tested at 3 kV alternating current for 1 s. Production records should capture roll lot number, adhesive batch, unwind tension setting, measured tape thickness, and conditioning time. Rolls exposed to high humidity can absorb moisture at the core or at the adhesive interface; conditioning at 23 ± 2 °C and 50 ± 5 % RH for at least 24 h before unwinding reduces edge tear and adhesive transfer in high-speed wrapping heads. The tape should not be applied below 0 °C unless the manufacturer has confirmed low-temperature adhesive flow; low-temperature mechanical testing can be performed according to ASTM D3759/D3759M to quantify the reduction in elongation before specification.
The PFVT product family is not a drop-in replacement for thin polyimide, soft PVC, or chemically inert PTFE tape systems. The primary distinction is gauging: PFVT is supplied in 0.76 mm and 1.14 mm nominal thicknesses, whereas conventional PVC electrical tape is typically 0.15 mm to 0.19 mm, polyimide tape is typically 0.025 mm to 0.05 mm, and many PTFE construction tapes are below 0.13 mm. The heavier PFVT gauges provide greater resistance to screw-head cut-through and abrasion, but they reduce conformability on small-radius contacts. Polyimide tape retains dimensional stability at high temperature and is selected for temporary masking or thin high-temperature wrap, while PFVT is selected for bulk electrical and mechanical protection. PTFE tape offers lower surface energy and superior chemical inertness but generally requires specialised backing treatment for bond strength; PFVT should not be assumed to match PTFE resistance to aggressive solvents. The comparative table below lists the major architectural and test differences for specification screening.
| Attribute | Winlite PFVT | Conventional PVC tape | Polyimide tape | PTFE tape |
|---|---|---|---|---|
| Nominal backing thickness | 0.76 mm / 1.14 mm | 0.15 mm – 0.19 mm | 0.025 mm – 0.05 mm | < 0.13 mm typical |
| Principal application | busbar and joint bulk insulation | general electrical insulation and colour coding | high-temperature wrap and masking | chemical release and high-temperature protection |
| Dielectric test standard | ASTM D1000 | IEC 60454-2 | ASTM D149 | ASTM D149 |
| Conformability | moderate to high; reduces with 1.14 mm gauge | very high | low to moderate | moderate |
| Chemical resistance | application test required; limited published data | moderate | high | very high |
| Continuous temperature class | manufacturer-declared; verify UL 510 | Class A typical 105 °C | Class C typical 240 °C | typically up to 260 °C |
Roll stock should remain sealed in the original polyethylene pouch until the point of use. Pressure-sensitive adhesive systems can migrate or absorb moisture under elevated storage temperature; warehouse storage should remain below 30 °C and below 70 % RH. Exceeding these boundaries can produce edge blocking, adhesive ooze, and a measurable reduction in unwind peel. Shelf-life control is lot-specific and should be based on ASTM D3330/D3330M peel adhesion and ASTM D1000 dielectric breakdown; a lot should not be accepted beyond the manufacturer’s shelf-life without retest. Because the 1.14 mm gauge is thicker and heavier than standard PVC tape, roll edge damage from drop impact is a practical failure mode. A crushed edge can create a local adhesive transfer site that propagates as a web tear through the unwinding station, contaminating the guide rollers and producing non-uniform overlap on the harness line.
| Document / Standard | Relevant Method / Clause | Application |
|---|---|---|
| ASTM D1000-17 | dielectric breakdown, elongation, adhesion | electrical tape qualification |
| IEC 60454-2:2017 | pressure-sensitive adhesive tape test methods | electrical tape classification |
| ASTM D3652/D3652M | thickness measurement | gauge verification for 0.76 mm and 1.14 mm |
| ASTM D3330/D3330M | peel adhesion of pressure-sensitive tape | substrate adhesion verification |
| IEC 60664-1:2020 | insulation coordination | system-level clearance and creepage design |
| UL 510 | insulating tape construction and performance | component recognition where required |
| REACH | SVHC documentation | EU market compliance |
| RoHS 2011/65/EU | restricted substance limits | electrical and electronic equipment |
In a motor control centre busbar assembly, the PFVT wrapping station should be positioned after bolt torque verification and before any heat-shrink sleeve placement. If the tape is wrapped over a bolted joint before torque verification, removal for re-torque destroys the material and introduces adhesive contamination. The product should not be used as a torque seal or as a moisture barrier for outdoor terminations unless the manufacturer has provided documented water-vapour transmission data. For maintainable busbar joints that will be re-opened, a release layer or taping after final torque is preferred. Final inspection should include a high-potential withstand check at the voltage specified by the equipment standard, an overlap gauge check at the highest-curvature position, and a visual check for edge lift or adhesive ooze. Failed units should be re-taped with a fresh roll; partially unwound tape that has contacted the conductor should not be re-used because dielectric contamination cannot be visually detected.
