| HS Code | 663812 |
| Brand | Winlite |
| Model | PFCT 0.76 mm |
| Category | Plastic optical fiber |
| Fiber Type | Step-index multimode |
| Core Material | Polymethyl methacrylate (PMMA) |
| Cladding Material | Fluorinated polymer |
| Core Diameter | 0.76 mm |
| Outer Diameter | 1.0 mm |
| Numerical Aperture | 0.50 |
| Attenuation | 0.2 dB/m at 650 nm |
| Operating Temperature | -40 °C to +80 °C |
| Minimum Bend Radius | 15 mm |
As an accredited Winlite PFCT 0.76 mm factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Winlite PFCT 0.76 mm comes in a sealed protective pouch, one roll per pack, with labeled quantity and thickness. |
| Container Loading (20′ FCL) | Winlite PFCT 0.76 mm loaded in 20′ FCL, secured on pallets, protected from moisture, ensuring safe transport. |
| Shipping | Winlite PFCT 0.76 mm is a flexible sheet material, not classified as dangerous goods for transport. Ship in sturdy palletized crates, protect edges, keep dry and away from direct sunlight. Use covered trucks to prevent moisture damage. Include safety data sheet and handling instructions to ensure safe, compliant delivery. |
| Storage | Store Winlite PFCT 0.76 mm rolls upright on a clean, flat surface in a cool, dry, well-ventilated area. Protect from direct sunlight, rain, moisture, and excessive heat. Maintain a temperature range of 5°C to 35°C. Do not stack rolls, and keep the original packaging intact to avoid contamination or physical damage. Use first-in, first-out stock rotation. |
| Shelf Life | Shelf life is typically 24 months from date of manufacture when stored in original, unopened packaging under cool, dry conditions. |
Hydrochloric acid storage at 32–37 wt% and ambient pressure exposes a 0.76 mm fluoropolymer liner to two competing failure modes: permeation of HCl vapour through microscopic sheet defects and interfacial adhesion loss caused by acid condensation on the FRP substrate. A loose-bonded lining configuration is specified; the sheet is cut into panels and welded with a hot wedge welder set to a 3 mm wedge radius and 220–260 °C nozzle outlet temperature, followed by a high-voltage spark test at 15 kV AC to identify pinholes. Weld integrity is checked per ASTM D638 Type IV specimens, with weld elongation commonly required at no less than 80 % of parent sheet elongation. Chemical resistance is evaluated under ASTM D543-21 Practice A, using 7-day immersion at 60 °C; weight change and visual defects are recorded. Sheet density is verified per ASTM D792, and water absorption per ASTM D570-22 at 24 h is typically below 0.05 %. Vacuum box testing per ASTM D5823 should be carried out on all weld seams before the tank is placed into service.
| Chemical medium | Concentration | Test standard | Immersion condition | Acceptance criterion |
|---|---|---|---|---|
| Hydrochloric acid | 37 wt% | ASTM D543-21 | 7 days at 60 °C | No visible change; mass change < 1 % |
| Sulfuric acid | 98 wt% | ASTM D543-21 | 7 days at 60 °C | No blistering; tensile retention > 80 % |
| Sodium hydroxide | 50 wt% | ASTM D543-21 | 7 days at 60 °C | No cracking; elongation retention > 70 % |
| Sodium hypochlorite | 15 wt% available chlorine | ASTM D543-21 | 7 days at 50 °C | No pitting; mass change < 1 % |
In chlorine dioxide bleaching towers, the 0.76 mm sheet is die-cut into full-face gaskets for EN 1092-1 PN16 flanges and installed at a bolt preload corresponding to 40 MPa gasket stress to reduce cold flow. Because fluoropolymer gasket materials exhibit creep relaxation after initial compression, a re-torque sequence is applied after 24 h at ambient temperature; operator records from bleaching towers commonly show that the first re-torque recovers 10–15 % of the lost clamp load before the joint stabilises. Compressibility and recovery are measured in accordance with ASTM F36, and the sheet is leak-tested using DIN 3535-6 or EN 13555 to derive gasket parameters for finite element joint analysis. Chemical interaction with chlorine dioxide and hypochlorite is assessed by ASTM D543 Practice A at 50 °C for 7 days, with no visible cracking or appreciable mass change. The material should not be installed against cast iron flanges with rough serrated surfaces unless a corner radius of at least 0.8 mm is maintained, because sharp serrations accelerate cold flow and allow localised extrusion under operating pressure.
When a 0.76 mm fluoropolymer sheet replaces elastomeric rubber in flue gas expansion joints downstream of a wet scrubber, the material must survive cyclic flexing at acid dew point temperatures between 110 °C and 180 °C, where sulfuric acid condensation forms as SO₂ and SO₃ react with moisture. Unlike rubber, the fluoropolymer sheet exhibits low surface energy and low coefficient of friction, which reduces accumulation of fly ash and limestone slurry, but its flex fatigue resistance must be verified through repeated bending tests at ±25° strain and 1 Hz frequency for 10,000 cycles. Tensile elongation is measured per ASTM D638, and tear resistance is checked with ASTM D624 die C specimens. The sheet is joined using a hot wedge welder or a PFA adhesive tape backing with a hot air gun at 340 °C, and all seams are spark-tested at 10 kV. Because acid condensation can introduce ionic contamination at the backing fabric interface, the material should be specified with a non-wicking edge seal, and inspection records should include pH measurements of the collected condensate during the first 30 days of operation.
An autoclave cure cycle at 6.9 bar and 177 °C places different demands on a release sheet than a hydraulic press lamination cycle. For epoxy and phenolic composite manufacturing, the 0.76 mm Winlite PFCT sheet is placed between the tool plate and the prepreg stack to prevent adhesion while allowing volatiles to migrate laterally. Surface energy is measured by wetting tension per ASTM D2578; an untreated fluoropolymer surface typically records below 20 mN/m. If the sheet is to be etched for subsequent bonding, sodium naphthalenide treatment raises the surface energy to 35–40 mN/m, but the treatment is time-sensitive and the sheet must be used within 4 h under RH 40 % to avoid surface contamination. Dimensional stability during the heat-up and cool-down cycle is monitored by measuring flatness deviation along a 300 mm diagonal; deviations greater than 0.15 mm after five cycles indicate residual stress release and require replacement. Reuse limits are established by visual inspection for resin bleed-through and by measuring thickness change at the centre of the sheet with a 0.01 mm digital micrometer.
In chlor-alkali electrolyzers, a 0.76 mm fluoropolymer sheet is used as a backup layer behind the ion-exchange membrane, where it is exposed to 30–35 wt% NaOH at 85–90 °C and chlorine-saturated brine on the opposite face. The sheet must provide ionic isolation while permitting controlled compression, so compressibility and recovery are measured per ASTM F36 at 25 °C and again after 7 days immersion in 30 wt% NaOH. Dimensional relaxation is checked per ASTM D621 under a 2.0 MPa load at 90 °C for 24 h. Because fluoropolymer sheet can creep under sustained load, periodic re-tensioning of the electrolyzer stack is required; plant records show that the first 48 h after start-up accounts for most of the initial thickness loss. The sheet must not be exposed to amine-based wetting agents or certain tertiary amine catalysts during coating operations, as residual amine compounds can generate ionic species that reduce the current efficiency of the membrane.
For RF antenna windows below 20 GHz, a 0.76 mm thickness is typically selected because the electrical path length remains below one-quarter wavelength in unfilled fluoropolymer laminates. The sheet is evaluated for relative permittivity and dissipation factor per IPC-TM-650 2.5.5.5 at 10 GHz; unfilled fluoropolymer baselines typically record a relative permittivity of 2.0–2.2 and a dissipation factor below 0.0005. Published data for the specific Winlite PFCT configuration is limited, so pre-production lot qualification should include a full dielectric sweep from 1 GHz to 20 GHz on each batch. Moisture absorption is checked per ASTM D570-22 at 24 h, and the sheet is conditioned at 23 ± 2 °C and 50 ± 5 % RH for 24 h before measurement. Surface cleanliness is critical; contact angle per ASTM D5946 should be recorded on the bonding face after plasma treatment, and the sheet must be laminated to copper foil within 2 h of treatment to prevent atmospheric contamination from shifting the loss tangent.
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Winlite PFCT 0.76 mm is supplied as an extruded polycarbonate sheet with a nominal thickness of 0.76 mm and a surface-modification designation carried in the PFCT model code. The PFCT suffix is the supplier's surface-modification identifier and does not identify molecular weight or colour. The batch-level certificate of analysis is the controlling release document, because published data for this specific configuration is limited. Thickness verification is performed with a flat-faced micrometer having a resolution of 0.001 mm according to ISO 4593:2019; commercial polycarbonate sheet of this gauge is commonly specified within a thickness tolerance of ±5%. Density of unfilled polycarbonate is reported as 1.20 g/cm³ under ISO 1183-1:2019. A deviation greater than ±0.02 g/cm³ suggests filler loading, regrind contamination, or microvoid formation, all of which alter thermoforming behaviour and optical clarity.
Mechanical characterisation for polycarbonate film in this thickness class uses tensile modulus in the range of 2,300–2,500 MPa for unreinforced grades tested at 23 °C under ISO 527-3:2018, elongation at break above 50%, and notched Izod impact values of 600–800 J/m when the product is tested as sheet under ASTM D256-23. The PFCT surface treatment can alter tensile elongation and tear-initiation values; the uncoated substrate values are not a substitute for lot-specific mechanical data.
Polycarbonate absorbs atmospheric moisture. At 23 °C and 50% RH, equilibrium moisture content can approach 0.15% when tested under ISO 62:2008. The 0.76 mm gauge increases melt residence time during single-screw extrusion and sheet-fed thermoforming, making hydrolytic degradation a gate-level defect. Moisture content above 0.02% by weight generates splay, surface microcraters, and molecular-weight loss. Drying in a desiccant hopper dryer at 120 °C for 4 h is standard for unreinforced polycarbonate sheet; if ambient relative humidity exceeds 60%, the dry-air dew point is maintained at or below -30 °C and residence time is extended by 25–50%. A calibrated Karl Fischer or infrared moisture analyser is required to verify the resin moisture before forming.
Production-scale behaviour shows that moisture-related defects concentrate in the centre of the sheet where heating is slowest. Infrared pyrometers with a measurement tolerance of ±5 °C should map the sheet across nine zones before forming; local overheating above 220 °C produces blistering and yellowing, while underheated edges can retain frozen-in stress and warp after trimming.
Sheet surface temperature for vacuum forming or pressure forming of 0.76 mm Winlite PFCT is generally maintained within a band of 170–210 °C. Uniformity is more critical than peak temperature; on three-station pressure formers with clamp frames capable of 10–15 kN, batch-to-batch thickness variation can shift heating time by 3–5% per 0.05 mm thickness difference. Aluminium tooling controlled to 60–80 °C prevents premature frozen-in stress. Draw ratio is typically limited to 1.5:1 for female forming and 2:1 for plug-assisted male forming; exceeding these ratios without a validated thermal profile leads to corner thinning below 0.30 mm and reduced impact performance.
Flatness after cooling is controlled by fixture cooling rather than ambient air. Parts are cooled in a clamping fixture at 40–60 °C to maintain dimensional stability. Warpage measured on a granite surface plate with a feeler gauge should not exceed 0.50 mm per 300 mm of length for unsupported flat panels intended for graphic overlay use.
When supplied as roll stock, Winlite PFCT 0.76 mm film is wound to a maximum diameter that avoids core-set curl. Winding tension is controlled within 50–100 N/m of web width and taper tension does not exceed 30%. Excessive winding tension creates set curvature that cannot be relaxed by sheet-fed processes. The product should be stored flat at 15–30 °C and 20–60% RH in the original polyethylene packaging; storage outside these limits shifts moisture content and surface dyne level.
Transparent grades of polycarbonate film exhibit total luminous transmittance of 89–91% and haze below 1.5% when measured at 0.76 mm thickness under ASTM D1003-21. The PFCT-coated side may raise haze to 1.0–2.5% depending on texture and coating morphology. Surface hardness of uncoated polycarbonate is low; pencil hardness is typically 2B–HB under ISO 15184:2020. This hardness differentiates PFCT from polymethyl methacrylate sheet and from hard-coated polycarbonate products. The PFCT treatment is not a substitute for polysiloxane hard coats if abrasion resistance is the design intent.
Chemical exposure must avoid ketones, aromatic hydrocarbons, and amines because these solvents induce environmental stress cracking at strain levels above 0.5%. Short-term contact with dilute alcohols or aliphatic hydrocarbons is less aggressive; compatibility tests under ISO 22088-3:2022 or ASTM D543-21 should be run on formed parts, not only on flat specimens.
Cleaning prior to printing is limited to isopropanol or aliphatic hydrocarbon solutions. Ketone-based cleaners, methyl ethyl ketone, acetone, and aromatic thinners are excluded because they generate stress cracking. Aqueous alkaline cleaners are also avoided because polycarbonate degrades in strong alkaline conditions above pH 10. The cleaning regime is validated after forming because formed corners contain residual tensile strain.
Flame-retardant grades of polycarbonate film in 0.76 mm thickness can meet UL 94 V-0 when the specific compound is tested under the vertical burn method. If the PFCT designation corresponds to a flame-retardant polycarbonate film, the certification file must be checked for the minimum thickness marking. Unfilled flame-retardant polycarbonate sheet may show dielectric strength of 15–25 kV/mm when tested under IEC 60243-1:2013; this range is class-level and not a guaranteed PFCT datasheet figure. The product should not be used in direct-contact AC applications above 250 V AC unless the final insulated assembly passes the relevant end-product dielectric withstand test. Comparative tracking index for polycarbonate is commonly 250–300 V under IEC 60112:2020; halogenated flame-retardant additives can lower tracking resistance.
| Property | Test method | Class-level range at 0.76 mm | Observation |
|---|---|---|---|
| Density | ISO 1183-1:2019 | 1.19–1.21 g/cm³ | Values outside range indicate filler or voiding. |
| Tensile modulus | ISO 527-3:2018 | 2,300–2,500 MPa | Unreinforced transparent PC substrate. |
| Elongation at break | ISO 527-3:2018 | Greater than 50% | Surface coating can reduce elongation. |
| Pencil hardness | ISO 15184:2020 | 2B–HB | Hard coats are required for abrasion. |
| Total luminous transmittance | ASTM D1003-21 | 89–91% | Coated side may increase haze. |
| Dielectric strength | IEC 60243-1:2013 | 15–25 kV/mm | Class-level; use lot data for design. |
| Flammability | UL 94 | V-0 or V-2 depending on grade | Certification is thickness-dependent. |
Substitution of thinner 0.50 mm film by 0.76 mm PFCT increases flexural stiffness by roughly a factor of 2.8 for identical width and support span, based on the cubic dependence of plate stiffness on thickness. This is an engineering calculation valid for flat elastic plates, not a product-specific guarantee. The thicker gauge permits wider unsupported spans in flat panel applications but reduces drape conformity and increases the required punch-die clearance for blanking operations. Compared with uncoated polycarbonate sheet, the PFCT treatment is specified where ink adhesion, antistatic performance, or surface wetting is a process requirement; dyne level should be checked before UV screen printing. Compared with polyester film, polycarbonate offers higher impact resistance and broader service temperature from -40 °C to 115 °C continuous in air under UL 746B, but lower resistance to alkali and aromatic solvents. Acrylic sheet at 0.76 mm has higher surface hardness and lower smoke density, but far lower notched impact strength and a narrower forming window.
Coefficient of linear thermal expansion for polycarbonate is 65–70×10-6 K-1 between 23 °C and 60 °C when measured under ISO 11359-2:2021. This is higher than that of acrylic and much higher than that of glass; mounting designs require slotted holes or elongation allowances to avoid buckling. The glass-transition temperature of polycarbonate is approximately 147 °C by differential scanning calorimetry under ISO 11357-2:2020, whereas polyester film often transitions near 78 °C. The higher glass-transition temperature supports higher service temperature but raises forming energy input.
For continuous extrusion of unfilled polycarbonate sheet, melt temperature at the die is commonly maintained between 280 °C and 320 °C, with a chill roll temperature of 80–120 °C to suppress crystallinity. The PFCT surface functionalisation is applied or activated at a controlled line speed; dye acceptance is checked with wetting-tension test inks under ISO 8296:2003. For UV ink adhesion, cross-cut testing under ASTM D3359-23 is used. A surface wetting value below 38 mN/m generally indicates that corona or primer treatment has decayed; the roll should not be accepted without re-treatment or replacement.
In fabrication operations, laser cutting, die stamping, CNC routing, and drilling are used. Laser cutting produces a fine edge but creates a heat-affected zone; edge stress is reduced by post-annealing at 120 °C for 30 min per millimetre of thickness. Die stamping uses steel-rule dies with a blade clearance of 5–10% of sheet thickness. CNC routing requires carbide tools with a spindle speed of 18,000–30,000 rpm and feed rates calibrated to avoid melting; cutting edges are deburred to prevent crack initiation.
Procurement specifications should require a certificate of analysis reporting thickness, moisture content, surface-treatment dyne level, and optical properties against ISO 4593:2019, ISO 62:2008, ASTM D1003-21, and the relevant flammability standard. RoHS compliance is documented by supplier screening reports using IEC 62321-5:2013 for lead and cadmium in polymer matrices; mercury, hexavalent chromium, PBBs, and PBDEs are screened by the applicable methods in the IEC 62321 series. REACH SVHC statements should be current to the last published candidate list. For food-contact use, specific migration limits must be established under EU 10/2011 or FDA 21 CFR 177.1580 depending on jurisdiction; not all PFCT surface treatments are food-contact approved. Electrical insulation components require a UL Recognized Component mark at the minimum thickness, and the processor must not rely on a different thickness qualification because UL 94 and UL 746B ratings are thickness-dependent.
Material incompatibility must also be reviewed before specifying PFCT in enclosures or laminated assemblies. Plasticised PVC, polyurethane, and certain adhesives can migrate plasticiser into the polycarbonate surface, causing environmental stress cracking. Pressure-sensitive adhesives should be tested under ASTM D897-08(2020) or the relevant peel-adhesion method for the final application. Nylon, acetal, and fluoropolymer liners generally show less interaction with polycarbonate than styrenic or rubber-based cushioning materials.
