| HS Code | 710614 |
| Material | Polyethylene terephthalate |
| Thickness | 50 µm (available in 50–125 µm) |
| Density | 1.38 g/cm³ |
| Tensile Strength | ≥ 200 MPa |
| Elongation At Break | ≥ 100% |
| Tensile Modulus | 4.2 GPa |
| Light Transmittance | ≥ 90% |
| Haze | < 1% |
| Refractive Index | 1.575 |
| Melting Point | 255 °C |
| Glass Transition Temperature | 70 °C |
| Water Absorption | 0.2% |
| Shrinkage | ≤ 2% at 150 °C |
As an accredited Trosifol PET factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Trosifol PET is packaged in sealed, moisture-barrier drums, supplied in 25 kg quantities, with clear labeling and safety documentation. |
| Container Loading (20′ FCL) | Trosifol PET loaded in 20′ FCL on secured pallets, moisture-protected, properly stowed to ensure safe transport. |
| Shipping | Trosifol PET is shipped as rolls on sturdy pallets, wrapped and protected to prevent surface damage and deformation. It should be transported dry, undercover, and kept away from direct heat. The material is generally non-hazardous, but handling with care prevents edge damage and ensures product integrity. |
| Storage | Store Trosifol PET in its original sealed packaging in a cool, dry, well-ventilated area. Maintain temperature between 5–30°C and relative humidity below 60%. Protect from direct sunlight, UV radiation, heat sources, and solvent vapours. Keep rolls flat or as recommended by manufacturer, avoiding distortion. Use within stated shelf life. |
| Shelf Life | Trosifol PET has a shelf life of 12 months from production date when stored in original packaging in cool, dry conditions. |
In photovoltaic backsheet design, substitution of polyvinyl fluoride outer films with biaxially oriented polyester shifts the primary failure mode from surface chalking to interfacial hydrolysis at the polyester/encapsulant boundary. A three-layer backsheet structure with Trosifol PET as the core typically uses a 125–250 µm gauge film pretreated to 52–56 mN/m surface energy and coated on both faces with a primer or tie layer at 0.5–2.0 g/m² dry deposit. The PET core represents 60–78 vol% of the total backsheet stack, with outer weather-resistant layers and encapsulant-facing adhesion layers forming the balance. Compliance for modules using this construction is tested under IEC 61730-1:2016, IEC 61730-2:2016, and UL 1703, with insulation resistance maintained above 40 MΩ·m² after wet leakage current testing and visual integrity retained after 85°C/85% RH damp heat exposure for 1,000–3,000 h depending on module certification class. Downstream production involves unwinding the PET roll at 80–120 N web tension on a 2,200–2,800 mm wide coating and laminating line, applying two-side primer or adhesive coatings at line speeds up to 150 m/min, curing at 40–60°C for 24–48 h, and laminating to outer weatherable films at nip pressures of 0.4–0.6 MPa. Module manufacturing then laminates the backsheet to encapsulant and cells at 145–150°C for 14–18 min under vacuum. Terminal product types include glass-backsheet crystalline silicon modules, flexible thin-film modules, building-integrated photovoltaics, and floating solar panels. A documented operational boundary is that standard aromatic polyester backsheets lose tensile elongation after 3,000 h damp heat if combined with amine-cured tie layers; polyurethane or epoxy-hybrid primer systems are therefore specified to preserve elongation above 10% after accelerated aging measured by ASTM D882.
The controlling variable in PVB/PET/PVB trilayer interlayer design is not tensile strength but large-area optical distortion and adhesion retention after autoclave exposure. Trosifol PET inserted between two 0.38 mm or 0.76 mm PVB sheets at a core gauge of 100–250 µm typically constitutes 8–15 wt% of the finished interlayer stack. Core thickness above 250 µm introduces measurable birefringence and wedge-shaped stress zones in curved windscreen geometries, while thickness below 100 µm produces negligible tear resistance gains in EN 356 P2A security glazing tests. The downstream process begins with corona treatment to not less than 50 mN/m, followed by nip rolling at 60–80°C with roll gap 0.4–0.8 mm, and then autoclaving at 12–14 bar and 135–140°C for 60–120 min. Adhesion is verified by pummel testing under EN ISO 12543-2, impact performance under ECE R43 Annex 3 or ANSI Z97.1-2015, and moisture resistance under EN ISO 12543-4. Terminal products include automotive windscreens, hurricane-resistant architectural glazing, glass floors, overhead glazing, and ballistic-resistant laminates. Field experience from batch autoclave lines indicates that polyester surface energy below 50 mN/m after 30 days of uncontrolled storage produces edge air penetration and optical haze along busbar regions; corona treatment is therefore performed immediately before interlayer layup rather than at off-line finishing.
Class F rotating machinery insulation uses polyester film slot liners where continuous service temperature does not exceed the 105°C mechanical thermal index and 105°C electrical thermal index shown on the UL yellow card under UL 746B. For Trosifol PET in slot liner applications, thickness is specified from 125–350 µm, with 500–1,200 ppm of inorganic slip/anti-block particles added to improve punched edge cleanliness without reducing dielectric strength below 180 kV/mm at 23°C and 50% RH when tested under IEC 60674-3-2. Downstream processing includes progressive die-cutting, insertion into stator slots, and vacuum-pressure impregnation with solventless polyester or epoxy varnish at 130–140°C. Finished insulation systems are validated under IEC 60034-1, UL 1446, and dielectric breakdown testing per ASTM D149. Terminal product types cover servo motors, hermetic compressor motors, transformer layer insulation, solenoid coil liners, and power tool armatures. The hard boundary is thermal classification: PET slot liners are not acceptable for Class H systems at 180°C or Class N systems at 200°C because embrittlement and dielectric strength loss occur after approximately 20,000 h aging at 150°C. In those service temperatures polyimide or polyamide-imide films are specified instead.
| Standard | Test condition | Minimum or required value |
|---|---|---|
| IEC 60674-3-2 | 23°C, 50% RH | 180 kV/mm dielectric strength |
| ASTM D257 | 23°C | 1×10^15 Ω·cm volume resistivity |
| UL 746B | Thermal index | 105°C electrical / 105°C mechanical |
Sterile-barrier lidding for thermoformed PETG trays imposes simultaneous microbial barrier and peelable seal integrity requirements on polyester film. Trosifol PET at 23–75 µm base gauge is extrusion-coated with a peelable sealant layer at 20–30 µm thickness; the sealant layer therefore represents approximately 30–50 wt% of the finished lidding structure depending on base-gauge selection. Printing is applied by flexographic or rotogravure equipment at 1.5–3.0 g/m² dry ink laydown. Compliance is maintained under ISO 11607-1:2019 for sterile barrier packaging, ISO 10993-5:2009 for cytotoxicity, ISO 10993-10:2010 for sensitization, FDA 21 CFR 177.1630 for polyester in food and drug contact, and EU Regulation 10/2011 with overall migration below 10 mg/dm². Downstream production includes slitting to 50–400 mm widths, lamination to multi-cavity tray sealing lines, and heat sealing at 150–180°C, 0.3–0.6 MPa, and 0.5–1.5 s dwell to achieve a peelable opening force of 3–8 N/15 mm under ASTM F88. Terminal product types include pre-filled syringe pouches, catheter trays, wound care kits, pharmaceutical blister lids, and surgical instrument pouches. A documented operational boundary is that gamma irradiation above 45 kGy can induce ambering and reduce elongation of aromatic polyester film; when irradiation above this dose is specified, the sealant and film stack must be validated for color shift and seal strength retention at the exact sterilization dose.
In outdoor durable label and membrane switch overlay production, biaxially oriented PET face stock is selected for dimensional stability under thermal cycling rather than for initial tear strength. The Trosifol PET surface is pre-treated to 52 mN/m or higher and topcoated with a 2–5 µm acrylic or polyester receptor layer; pressure-sensitive adhesive is coated at 18–25 g/m² dry deposit, with release liner caliper controlled at 50–75 µm. The PET base film constitutes 85–95 wt% of the construction, with coating and adhesive layers contributing the remaining 5–15 wt%. Durable label compliance is verified under UL 969 for marking permanence, ASTM D3330 for peel adhesion, and RoHS 2011/65/EU for restricted substances. Downstream processes include UV inkjet or screen printing, flatbed die-cutting at 60–120 strokes/min, laser kiss-cutting for corner radii down to 0.1 mm, and lamination to UV-resistant overlaminates. Terminal product types include outdoor power tool labels, automotive under-hood identification labels, appliance control panel overlays, industrial warning nameplates, and membrane switch graphic layers. On production lines, adhesive oozing and matrix fracture occur when die-cutting temperature exceeds 35°C; chilled die stations maintained at 10–15°C are used to preserve clean matrix removal and consistent dimensional tolerance.
The forming window for PET carrier tape is narrower than for PVC or polystyrene, requiring a preheat zone of 80–100°C and a forming zone of 110–130°C with temperature variation held within ±3°C to control pocket depth tolerance under 0.10 mm. Trosifol PET at 150–300 µm gauge is slit to 8–24 mm widths; the ESD function is achieved through a conductive carbon-loaded core or an antistatic surface coating that maintains surface resistivity between 10^4–10^8 Ω/sq per ANSI/ESD S11.4 or IEC 61340-5-1. The conductive filler or coating addition is 3–12 wt% in the modified layer depending on target resistivity, with carbon black dispersion controlled above 1 µm to avoid pinholing. Downstream processing includes high-speed thermoforming at 40–80 pockets/min, embossed pocket depths from 0.5 mm to 5.0 mm, and sealing with heat-activatable cover tape at 150–180°C, 0.3–0.6 MPa, and 0.2–0.8 s dwell. Compliance for component packaging is documented under ANSI/EIA-481-D and IEC 60286-3. Terminal products include carrier tape for resistors, capacitors, diodes, LEDs, and small-outline integrated circuits in automated pick-and-place assembly. A process limitation is that repeated thermoforming at the upper end of the forming window causes stress-whitening at pocket corners; tooling with R ≥ 0.5 mm corner radii and plug-assist forming at 0.2–0.4 m/s plug speed reduces defect rates below 0.1%. Published data for Trosifol PET in ESD carrier tape configurations is limited; the forming and static-dissipative parameters above should be confirmed against the grade-specific Kuraray technical datasheet.
Competitive Trosifol PET prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615380400285 or mail to sales2@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615380400285
Email: sales2@liwei-chem.com
Flexible payment, competitive price, premium service - Inquire now!
Trosifol PET is a biaxially oriented polyethylene terephthalate film supplied under the Trosifol brand for use as a rigid interlayer or as a high-modulus component in multi-layer laminated glass and spall-shield inserts. The product is available in clear and surface-treated grades, with nominal thickness designations commonly referenced from 25 µm to 250 µm; grade-specific thickness tolerances and roll formats should be obtained from the current manufacturer datasheet because published data for each Trosifol PET thickness class is limited. The base polymer is high-clarity polyester with a density of 1.38–1.40 g/cm³ when measured according to ISO 1183-1:2019. Differential scanning calorimetry typically shows a glass transition temperature of 70–80 °C and a melting endotherm above 250 °C. These thermal transitions define the upper processing boundary but do not substitute for production lamination trials because glass thickness, vacuum-bag geometry, and edge condition dominate heat transfer. Dimensional stability is anisotropic: machine-direction shrinkage after 30 min at 150 °C is typically 0.5–1.5 % and transverse-direction shrinkage is commonly 0–0.5 % for stabilized industrial grades, using ASTM D1204 as the test method.
Grade nomenclature generally follows the pattern Trosifol PET plus nominal thickness; variants may include untreated film, corona-treated film, adhesion-promoted film, and UV-stabilized film. The corona-treated and adhesion-promoted variants differ in initial surface energy and in storage stability, which affects incoming quality-control practice. Incoming inspection should measure surface energy according to ASTM D2578 and reject stock that falls below the threshold defined by the laminating line qualification. The exact threshold varies with the tie layer, but industrial practice frequently requires an initial wetting surface energy above 50 mN/m for consistent glass adhesion.
Selection of Trosifol PET over plasticized PVB is typically driven by higher tensile modulus, lower equilibrium moisture uptake, and reduced creep under sustained load. In representative biaxially oriented PET film data, tensile strength ranges from 150 MPa to 250 MPa in the machine direction and elongation at break from 50 % to 120 % when tested according to ISO 527-3; plasticized PVB interlayers, by contrast, commonly exhibit tensile strength below 25 MPa and elongation values exceeding 200 %. Ionoplast interlayers such as SentryGlas occupy an intermediate position, with tensile strength near 30–40 MPa and high toughness under impact. The higher modulus of PET, often reported in the range of 2.5–4.5 GPa, increases the flexural rigidity of a laminate but also reduces its ability to redistribute localized stress through large viscoelastic deformation. This distinction matters in security glazing, ballistic laminates, and spall shields, where the PET layer acts as a high-modulus barrier rather than as an energy-absorbing elastomer.
The structural difference between PET and PVB is not limited to mechanical response. Plasticized PVB contains plasticizer that migrates slowly within the polymer matrix, whereas PET is unplasticized and exhibits lower migration-driven property drift over time. PET also has a sharper glass transition and less cold-flow behavior, which means that laminate edge squeeze-out and thickness tolerance control differ from PVB processing. In multi-layer glass configurations, the PET film may be combined with a PVB or ionoplast tie layer to balance adhesion and impact performance; the PET layer contributes dimensional stability and fracture resistance, while the tie layer provides wetting and glass adhesion.
Mechanical property declarations should be obtained from the current Trosifol PET datasheet; the values in the following table are representative of biaxially oriented polyester films of equivalent optical grade and are not product-specific guarantees. For design verification, tensile properties should be measured on conditioned films at 23 ± 2 °C and 50 ± 5 % RH using ISO 527-3 for films below 250 µm thickness, and optical transmission should be determined using ISO 13468-2 or ASTM D1003.
| Property | Test method | Typical range for clear biaxially oriented PET film |
|---|---|---|
| Density | ISO 1183-1:2019 | 1.38–1.40 g/cm³ |
| Tensile strength, machine direction | ISO 527-3 | 150–250 MPa |
| Elongation at break, machine direction | ISO 527-3 | 50–120 % |
| Tensile modulus | ISO 527-3 | 2.5–4.5 GPa |
| Luminous transmittance, clear 50 µm | ISO 13468-2 | >88 % |
| Haze, clear grade | ASTM D1003 | <1.0 % |
| Moisture absorption, 24 h immersion | ISO 62 | 0.2–0.4 % |
| Shrinkage, 30 min at 150 °C, machine direction | ASTM D1204 | 0.5–1.5 % |
Lamination with Trosifol PET is not governed by the same plasticizer migration and moisture control requirements as PVB, but it introduces a narrower temperature tolerance because the polyester film remains dimensionally stable up to its glass transition and does not flow to fill glass surface irregularities in the same manner as a plasticized PVB melt. The stack must be deaired before autoclave consolidation; production-scale vacuum-bag lines typically draw 0.85–0.95 bar vacuum during cold deairing, although published data for this specific product configuration is limited and equipment-dependent. Because PET does not self-adhere to glass without an appropriate adhesion-promoting layer or silane primer, edge seal performance and edge deletion near the laminate perimeter require separate validation on the targeted glass configuration. The autoclave hold temperature reported for PVB-containing laminates is not automatically transferable; PET-containing stacks may require different hold times to prevent optical distortion from residual stresses. Observed failure modes in field-scale trials include mottle, optical wave distortion, and delamination at notched edges when the cooling rate exceeds the stress relaxation capacity of the PET layer.
Process conflicts arise when the autoclave temperature required for PVB or ionoplast adhesion exceeds the thermal stability boundary of adjacent PET films. Excessive hold time at high temperature can induce oligomer migration to the film surface, increasing haze and reducing interfacial adhesion. In addition, PET crystallinity increases when the laminate is held above the glass transition for extended periods; the crystallization rate becomes significant near 130–150 °C, and uncontrolled crystallization can raise haze and reduce impact toughness. The acceptable autoclave setpoint window for low-distortion laminates is often no wider than ±5 °C on load-thermocouple readings. Glass laminators should map autoclave load thermocouples to confirm edge-to-centre temperature uniformity; deviations greater than 5 °C across the stack can generate visible wave distortion. Pre-drying of the film at 60–80 °C for 4–6 h is recommended if the material has been exposed to relative humidity above 60 % for prolonged storage, because retained moisture can hydrolyze the polyester molecular weight during autoclave exposure and reduce film toughness.
Optical performance after lamination is evaluated by measuring luminous transmittance, haze, and yellowness index. Clear Trosifol PET grades are designed to maintain luminous transmittance above 88 % at 50 µm thickness when tested according to ISO 13468-2; haze values below 1.0 % are typical for clean, uncoated film but can increase after autoclave exposure if the film contains oligomer deposits or if glass surface contamination is present. Yellowness index is commonly assessed using ASTM E313 and should remain below 2.0 for indoor glazing applications; however, extended UV exposure can shift yellowness in unprotected PET unless the grade incorporates UV stabilizers. Published data for Trosifol PET weathering under ISO 4892-2 are limited and should be requested for facade or exterior applications.
Equilibrium moisture uptake of biaxially oriented PET is significantly lower than that of plasticized PVB. Immersion data according to ISO 62 commonly show mass gain of 0.2–0.4 % after 24 h at 23 °C, whereas PVB can absorb several percent moisture under equivalent conditions. This lower moisture affinity reduces the risk of edge clouding in humid climates but does not eliminate the need for edge seal protection because water ingress at the glass-interlayer boundary can still propagate interfacial failure. Trosifol PET is resistant to dilute acids and many aliphatic hydrocarbons but is attacked by concentrated strong acids, alkaline solutions, and certain halogenated solvents. Compatibility with silicone sealants, polysulfide systems, and polyurethane edge seals should be tested according to ISO 11431 or ASTM C1087 using the exact sealant chemistry specified for the project. Field data from structural glazing installations indicate that edge delamination occurs primarily when sealant plasticizer migration is combined with cyclic thermal movement; therefore, adhesion-promoting primers and edge deletion procedures must be qualified on the production-scale wet-glazing line.
Compliance documentation for Trosifol PET is supplied through the manufacturer’s certificate of analysis and safety data sheet; the product is not automatically equivalent to all PET films because surface treatment level, oligomer content, and heat stabilization package vary between grades. The table below lists the standard designations commonly used in incoming inspection protocols for polyester film intended for laminated glass or photovoltaic backsheet applications.
| Property | Standard designation | Typical acceptance criterion |
|---|---|---|
| Thickness tolerance | ISO 4593 | ±5 % or grade-specific |
| Tensile strength | ISO 527-3 | Report machine direction and transverse direction |
| Elongation at break | ISO 527-3 | Report machine direction and transverse direction |
| Haze | ASTM D1003 | <1.0 % |
| Luminous transmittance | ISO 13468-2 | >88 % |
| Yellowness index | ASTM E313 | <2.0 |
| Moisture absorption | ISO 62 | 0.2–0.4 % |
| Shrinkage | ASTM D1204 | Report at 150 °C |
| Surface energy | ASTM D2578 | >50 mN/m for coated/corona grades |
Edge deletion is more critical for PET-containing laminates than for monolithic PVB laminates because the high-modulus PET layer does not viscously flow into edge irregularities during autoclave consolidation. If the PET layer extends too close to the glass edge, sealant contact can create a stiff edge constraint that promotes stress concentration under wind load or thermal movement. Production lines should establish edge deletion dimensions by pull-out testing on the actual glass make-up; no single fixed deletion distance applies across all sealant types because modulus, plasticizer content, and cure chemistry differ. Testing according to ASTM C1087 or ISO 11431 provides compatibility data, but the pass/fail criterion must be linked to the specified sealant joint movement capability and not to visual appearance alone.
Unlike PVB, which derives its safety function from high elongation and adhesion to glass, Trosifol PET provides a dimensionally stable, high-modulus layer that resists tearing and limits crack propagation. In spall-shield configurations the polyester layer is often combined with a plasticized PVB or ionoplast layer to balance stiffness and toughness; the PET layer faces the threat side or the back side depending on the specified fragment retention performance. Compared with ionoplast, Trosifol PET has lower tear propagation resistance and lower post-yield elongation, but it offers higher tensile modulus and lower material cost per unit thickness in some insert configurations. Compared with polycarbonate film, Trosifol PET exhibits better resistance to stress cracking from many plasticizers and cleaning agents, but lower impact toughness at equivalent thickness. These differences require that selection be based on standardized ballistics or forced-entry testing such as EN 356, ASTM F1233, or UL 972, rather than on single-point mechanical values. Published datasheet performance for Trosifol PET in specific ballistic configurations is limited; project-specific testing is required.
