| HS Code | 775546 |
| Product | SINOPEC EVA UE2860TF |
| Material | Ethylene-Vinyl Acetate (EVA) copolymer |
| Vinyl Acetate Content | 28% |
| Melt Flow Rate 190 C 2 16 Kg | 60 g/10min |
| Density | 0.95 g/cm3 |
| Melting Point | 75 °C |
| Vicat Softening Point | 55 °C |
| Tensile Strength | 8 MPa |
| Elongation At Break | 800% |
| Hardness | 85 Shore A |
| Appearance | White pellets |
| Typical Applications | Hot melt adhesives, coatings, polymer modification |
As an accredited SINOPEC EVA UE2860TF factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SINOPEC EVA UE2860TF is supplied in 25 kg multi-wall paper bags, sealed with a moisture barrier for safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL shipment of SINOPEC EVA UE2860TF, palletized bags securely stowed, ensuring safe, efficient transport. |
| Shipping | SINOPEC EVA UE2860TF is shipped as virgin granules in 25 kg bags on pallets, shrink-wrapped for stability. Standard 20-ft containers are used for sea freight, with dry, ventilated storage to prevent moisture absorption. Avoid direct sunlight and high temperatures during transport to maintain product quality and flowability. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep the original sealed packaging intact to prevent moisture absorption and contamination. Avoid stacking excessively high to prevent bag deformation. Maintain moderate temperatures and low humidity. Use within the recommended shelf life for optimal processing and performance. |
| Shelf Life | Shelf life is typically 24 months when stored unopened in a cool, dry place, protected from direct sunlight and moisture. |
Ethylene-vinyl acetate resin designated SINOPEC EVA UE2860TF has a nominal vinyl acetate content of 28 wt% and a melt mass-flow rate of 6 g/10 min measured at 190°C/2.16 kg under ISO 1133-1:2022. In photovoltaic encapsulant film production, this VA level places the material in the high-VA segment where the copolymer contributes visible light transmittance and melt adhesion to glass while retaining sufficient modulus retention after peroxide crosslinking. The primary compliance framework for finished modules is IEC 61215-1:2021 for design qualification and IEC 61730-1:2023 for safety qualification; encapsulant-specific optical measurement procedures are defined in IEC 62788-1-4. For film mechanical property tracking on production lines, ASTM D882-18 is applied to thin-sheet tensile elongation, while gel fraction after cure is measured by ASTM D2765-16 to confirm crosslinking density. In a typical encapsulant formulation, UE2860TF is loaded at 96–98 wt% of the total film compound; the balance consists of an organic peroxide initiator at 0.6–1.2 phr, a vinyl silane adhesion promoter at 0.3–0.8 phr, a hindered phenolic antioxidant at 0.1–0.3 phr, and a UV stabilizer at 0.1–0.4 phr. Compounding is performed on a co-rotating twin-screw extruder with an L/D ratio of 40–48, barrel temperatures 120–150°C, and a strand pelletizer feeding vacuum-sealed aluminum foil packaging. Film casting uses a single-screw extruder with L/D 30–36, a 800–1600 mm flat die, and melt temperatures of 90–115°C; thickness is controlled at 0.40–0.60 mm with optical haze maintained below 5% for high-transmission module construction. Module lamination runs at 145–152°C for 12–18 min under vacuum and atmospheric pressure cycles, producing terminal products that include single-glass crystalline silicon modules, double-glass modules, and building-integrated photovoltaic laminates. Pre-drying at 60–70°C for 4–6 h is required when pellet surface humidity exceeds 60% relative humidity because water retained in the resin generates lamination bubbles. Compounded film should be stored below 25°C and consumed within 4–6 months to avoid peroxide decay.
| Qualification area | Standard designation | Applied property |
|---|---|---|
| Module design qualification | IEC 61215-1:2021 | Damp heat, thermal cycling, humidity freeze |
| Module safety qualification | IEC 61730-1:2023 | Electrical insulation, flammability response |
| Encapsulant optical measurement | IEC 62788-1-4 | Solar-weighted transmittance, yellowness index |
| Film tensile testing | ASTM D882-18 | Tensile strength and elongation at break |
| Crosslinking verification | ASTM D2765-16 | Gel content and swelling ratio |
When the copolymer enters a hot-melt adhesive formulation as a thermoplastic backbone, the 28 wt% vinyl acetate content provides broader compatibility with hydrogenated and non-hydrogenated hydrocarbon tackifier resins than lower-VA grades while retaining melt viscosity low enough for high-speed carton sealing lines. Regulatory compliance for food-contact packaging joints is established under FDA 21 CFR 175.105 for adhesive components used in indirect food contact, with REACH Regulation EC 1907/2006 applying to European industrial shipments and RoHS Directive 2011/65/EU applicable when the adhesive is used in electronics packaging. Typical addition ratios place UE2860TF at 18–35 wt% of the final adhesive mass, combined with 30–50 wt% hydrocarbon tackifier, 15–30 wt% paraffin or microcrystalline wax, 0.2–1.0 wt% hindered phenolic antioxidant, and 0–5 wt% plasticizer or naphthenic oil where low-temperature flexibility is required. Compounding is executed in jacketed sigma-blade mixers or co-rotating twin-screw extruders at 150–180°C under nitrogen blanketing; the melt is then passed through a hot-melt filter with 100–200 mesh screens to remove char. Application equipment is typically high-speed nozzle or roller systems operating at 160–190°C, with open time governed by wax type and coat weight controlled between 0.20–0.50 g/m² for case sealing. Terminal products include bookbinding adhesives, corrugated packaging hot melts, label attachment adhesives, and edge-banding adhesives for furniture. The operational boundary is a maximum melt temperature of 190°C and maximum residence time of 6–8 h; prolonged heating accelerates chain scission, leading to viscosity drift and char accumulation in application heads.
Closed-mold peroxide-cured foam requires that the blowing agent decomposition temperature be matched to the cure kinetics of the EVA phase to prevent pore collapse at the mold surface. The process window for UE2860TF is governed by the decomposition of azodicarbonamide at approximately 195–215°C in the compounded matrix and the half-life of dicumyl peroxide at 160–180°C. In a typical crosslinked foam formulation, UE2860TF is used at 50–80 phr, low-density polyethylene at 20–50 phr, calcium carbonate filler at 5–20 phr, azodicarbonamide at 2.5–6 phr, dicumyl peroxide at 0.5–1.2 phr, zinc oxide at 1–2 phr, and zinc stearate at 0.5–1.5 phr. Compounding is performed in an internal mixer with a drop temperature not exceeding 105°C to avoid premature blowing agent decomposition, followed by sheeting on a two-roll mill at 85–95°C. Molding uses hydraulic compression presses at 155–170°C and 150–200 bar for 8–15 min, after which the mold is opened in successive stages to allow controlled expansion and cooling. Compliance for flexible cellular products is assessed under ASTM D3575-20 for compressive deflection and stiffness, ASTM D395-18 for compression set, and REACH plus RoHS Directive 2011/65/EU for restricted substances. Terminal products include molded footwear midsoles, industrial cushioning sheets, thermal insulation tubes, and antifatigue mats. The practical upper VA content imposes lower hardness but also increased shrinkage after demolding; published data for this specific grade in highly filled expanded profiles is limited, and pre-trials should confirm blow ratio stability before continuous production.
In halogen-free cable jacket compounding, magnesium hydroxide and alumina trihydrate loadings above 150 phr are required to pass vertical flame propagation tests, and a high-VA EVA matrix is used to achieve filler wetting without excessive melt fracture. UE2860TF is formulated at 20–40 wt% of the polymer phase, blended with linear low-density polyethylene at 25–45 wt%, a maleic anhydride grafted compatibilizer at 5–10 wt%, alumina trihydrate or magnesium dihydroxide at 120–180 phr total, zinc borate at 5–15 phr, a processing aid at 1–3 phr, and a hindered phenolic antioxidant at 0.5–1.5 phr. Mixing is conducted on a Banbury mixer or co-rotating twin-screw extruder with L/D 44–52, barrel temperatures 140–180°C, and a die head temperature held below 190°C because ATH begins releasing water of crystallization near that threshold. The pelletized compound is then extruded onto cable cores through a single-screw extruder at 120–160°C with a draw-down ratio of 1.5–2.5:1 and a screw compression ratio of 2.0–2.5:1. Compliance for the jacket is verified under IEC 60332-1-2 for flame spread on a single vertical wire, IEC 60332-3-24 for flame spread on a vertical cable bundle, IEC 60754-1 for halogen acid gas content, IEC 60754-2 for pH and conductivity of evolved gases, and IEC 61034-2 for smoke density. Terminal products include low-smoke halogen-free jackets for residential building wire, transit vehicle control cables, marine cables, and data-center power distribution cables. Pre-drying at 60–70°C for 4 h is required when moisture content exceeds 0.05 wt% to avoid surface porosity during extrusion.
Because the vinyl acetate comonomer in UE2860TF reduces crystallinity and raises melt polarity, the grade functions as a carrier resin in additive masterbatches where high filler acceptance and pelletization consistency are required. Carrier loading is typically 100 phr, with active additives at 20–60 phr for pigment or flame-retardant masterbatches and up to 80 phr when processing aids and internal lubricants are added to control melt pressure. The compounding line is a co-rotating twin-screw extruder with L/D 40–48, screw speed 300–600 rpm, barrel temperatures 120–180°C, and underwater pelletizing to maintain spherical pellet geometry at high filler loadings. Regulatory compliance for masterbatch exports is established under REACH Regulation EC 1907/2006 and RoHS Directive 2011/65/EU; when the masterbatch is intended for food-contact packaging, downstream converters must verify the final article against EU 10/2011 and FDA 21 CFR 177.1350. Terminal products include flame-retardant concentrates for polyolefin cable compounds, color concentrates for EVA foams, and processing-aid masterbatches for polyethylene film lines. The material should not be blended with amine-based additives in masterbatch production because residual amine functionality can catalyze acid-catalyzed EVA ester hydrolysis at elevated temperatures.
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Among the ethylene-vinyl acetate copolymers produced by Sinopec’s petrochemical platform, the grade designated SINOPEC EVA UE2860TF is supplied as a film-grade EVA resin with a vinyl acetate content of 28 wt% and a melt mass-flow rate of 6.0 g/10 min when measured at 190 °C under 2.16 kg in accordance with ISO 1133-1:2022. The grade is used in photovoltaic encapsulation film, high-clarity cast film, and multi-layer extrusion coating, where the combination of polar vinyl acetate functionality, low-temperature flexibility, and controlled melt draw is required. Density is reported as 0.950 g/cm³ by ISO 1183-1:2019, with a differential scanning calorimetry melting peak near 72 °C under ISO 11357-3:2018 and a Vicat softening temperature of approximately 45 °C under ISO 306:2022. These values position UE2860TF in the 28 wt% VA class typically selected for encapsulant-grade EVA rather than in the lower-VA classes used for general packaging film.
The resin’s property balance is most frequently compared with lower-VA EVA copolymers and with higher-MFI grades from the same producer. Lower-VA grades reduce adhesion and low-temperature flexibility but increase stiffness and heat resistance; higher-MFI grades improve throughput at the expense of melt strength and gauge stability. The processing and application distinctions are addressed through the material benchmarks and comparative data that follow.
The following table consolidates representative datasheet values for SINOPEC EVA UE2860TF. Values are typical rather than guaranteed limits, and the batch certificate should govern for lot acceptance. Methods listed are used by polymer converters to set incoming inspection, extrusion parameters, and lamination profiles.
| Property | Method | Typical value |
|---|---|---|
| Vinyl acetate content | ASTM D5594-18a | 28 wt% |
| Melt mass-flow rate | ISO 1133-1:2022 | 6.0 g/10 min at 190 °C/2.16 kg |
| Density | ISO 1183-1:2019 | 0.950 g/cm³ |
| Melting peak temperature | ISO 11357-3:2018 | 72 °C |
| Vicat softening temperature A50 | ISO 306:2022 | 45 °C |
| Shore A hardness, 3 s | ISO 868:2003 | 75 |
| Tensile stress at break, 100 µm film | ISO 527-3:2018 | 12 MPa |
| Tensile strain at break, 100 µm film | ISO 527-3:2018 | 700% |
| Light transmittance, 2 mm moulded plaque | ISO 13468-1:2019 | >90% |
| Volume resistivity | IEC 60093:1980 | 1.0 × 1015 Ω·cm |
Lot-to-lot variation for EVA resins of this type is routinely monitored by the producer through gel count, yellowness index, and melt flow rate. Published data for exact gel-particle counts in UE2860TF is limited, so converter validation should include screen-pack pressure-rise tests or optical gel counting on 50 µm cast film.
On cast-film lines, UE2860TF is processed through a single-screw extruder with an L/D ratio of 25:1 to 30:1, a barrier screw, a screen changer, and a gear pump feeding a slot die. Melt temperature is normally maintained between 180 °C and 220 °C; the die is held at 200–220 °C to reduce resin viscosity at the lips and to improve gauge stability. For photovoltaic encapsulant sheet, chill-roll temperature is commonly set from 15 °C to 25 °C to control crystallinity and tack; thickness is measured by beta-gauge or laser-gauge feedback and held within ±5% of nominal. Film thickness from 400 µm to 800 µm is typical for photovoltaic encapsulant, and the grade’s melt strength permits stable drawing at commercial line speeds, though exact draw-resonance limits for this grade have not been published.
Because ethylene-vinyl acetate undergoes deacetylation at elevated temperature, residence time above 220 °C must be minimised; stagnant zones in the adapter or die can produce gel particles, die-lip buildup, and yellowing that become visible as optical defects in laminated modules. When ambient relative humidity exceeds 60%, pellets are pre-dried in a desiccant hopper dryer at 70–80 °C for 3–4 h to reduce surface moisture below 0.05 wt%, measured off-line by ISO 15512:2019 if required. Production-scale failures associated with inadequate drying include micro-voids in thick encapsulant sheet, unstable melt pump suction, and reduced peel-adhesion after lamination. In blown-film operations, UE2860TF is processed with a blow-up ratio of 2:1 to 3:1; cast film is preferred for photovoltaic encapsulant because it minimises orientation and gel streaks. Internal and external slip-agent levels are controlled because migration kinetics in the polymer matrix affect lamination adhesion; excessive erucamide or oleamide levels can reduce glass peel strength after lamination.
Direct substitution of UE2860TF for a lower-VA EVA changes the adhesion, optical, and low-temperature impact characteristics of the converted film. A lower-VA EVA such as SINOPEC EVA 14-2 has a vinyl acetate content of 14 wt% and a melt mass-flow rate of 2.0 g/10 min; its higher crystallinity increases stiffness and melting point but reduces glass adhesion and transparency. A higher-MFI grade in the same VA family, such as SINOPEC EVA UE2825 with 28 wt% VA and 25 g/10 min, reduces melt pressure and can increase throughput, but its lower melt strength makes cast film more susceptible to draw resonance and gauge variation. The comparison below summarises process-relevant variables.
| Resin | VA content | MFR by ISO 1133-1:2022 | Processing consequence |
|---|---|---|---|
| SINOPEC EVA UE2860TF | 28 wt% | 6.0 g/10 min | High melt strength; cast film and photovoltaic encapsulant use |
| SINOPEC EVA 14-2 | 14 wt% | 2.0 g/10 min | Higher stiffness and heat resistance; reduced glass adhesion |
| SINOPEC EVA UE2825 | 28 wt% | 25 g/10 min | High throughput; lower melt strength; draw-resonance risk in cast film |
The substitution effect is not limited to melt rheology. In laminated glass or photovoltaic structures, peel adhesion to glass after lamination is strongly influenced by VA content and peroxide formulation; 28 wt% VA copolymers typically provide interfacial wetting that lower-VA grades do not develop under the same lamination cycle. For high-speed film converting, lower-MFR UE2860TF generates higher extruder head pressure than UE2825 at the same throughput; a melt pump and pressure-limited screw design are therefore required when replacing a higher-MFR grade. Concerning optical performance, a 28 wt% VA polymer with controlled gel content and stabiliser package produces light transmittance above 90% on a 2 mm moulded plaque, whereas lower-VA film grades can show higher haze due to spherulitic crystallisation.
Photovoltaic encapsulant lines impose specific melt-quality requirements that the 28 wt% VA and 6.0 g/10 min melt flow rate combination is intended to address. In vacuum lamination, the encapsulant sheet must soften and flow under heat and pressure to fill spaces around cell interconnects and glass edge features, then crosslink by peroxide-initiated chemistry. The 28 wt% vinyl acetate provides polar acetate groups for wet adhesion to glass and polyester backsheet, while the 6.0 g/10 min melt flow rate keeps lamination flow within the process window without excessive squeeze-out. Encapsulant-grade EVA must retain high light transmittance and low haze after peroxide cure; formulations based on this resin are typically combined with silane adhesion promoters, peroxide, and UV stabilisers. Film quality depends heavily on gel-particle control, because visible gels in the encapsulant act as optical defects and can become localised electrical weak points. Module-level qualification is conducted under IEC 61215-1:2021, though the encapsulant itself is not certified under that standard; volume resistivity of 1.0 × 1015 Ω·cm by IEC 60093:1980 is relevant to module insulation requirements. Typical peroxide-cured EVA encapsulant formulations target a gel fraction above 70% after lamination by solvent extraction, but the exact value depends on peroxide type and cure cycle. Published data for UE2860TF-specific peel strength and gel count are limited, so batch validation is required.
High-shear compounding of UE2860TF in a co-rotating twin-screw extruder with 40:1 L/D requires a barrel temperature profile below 200 °C across the mixing zones to limit deacetylation and prevent vent-port fouling. Production-scale issues reported with EVA copolymers of this VA class include torque instability when acidic fillers or high-surface-area silicas are added without neutralisation, and screw wear when abrasive fillers are fed at high concentration. For peroxide masterbatches or silane-modified adhesion packages, the resin is typically fed in the main throat, liquid silane or peroxide is injected after the melt seal, and the devolatilisation port is operated at -0.08 MPa to remove acetic acid and moisture. The grade should not be combined with amine-based additives that can cause discolouration or premature gelation unless thermal stabiliser compatibility is verified by oxidative-induction-time testing at 200 °C under ISO 11357-6:2018. In multi-layer coextrusion, UE2860TF can serve as a tie layer between ethylene-acrylate seal layers and polyolefin skins; adhesion to corona-treated polyester or glass is influenced by surface energy, with corona treatment commonly specified at 40–50 mN/m wetting tension by ISO 8296:2003. Published data for exact torque-temperature relationships for this specific grade is limited, but the deacetylation threshold of EVA is documented in polymer processing literature.
Regarding regulatory status, grade-specific documentation from Sinopec should be obtained before use in food-contact, medical, or photovoltaic module applications. EVA copolymers of this type are generally candidate materials for assessment under FDA 21 CFR 177.1350 when formulated with compliant additives, but the commercial grade may contain processing antioxidants that require confirmation. Under REACH, the polymer itself is exempt from registration, though its monomers and additives must be registered; a supplier material declaration should confirm RoHS limits for cadmium, lead, mercury, and hexavalent chromium. Storage in unopened bags at temperatures below 30 °C and away from ultraviolet light is required to prevent moisture pickup and oxidative changes that increase gel accumulation; opened material should be consumed within 12 months of delivery. The resin is not recommended for direct contact with copper-containing surfaces during long melt residence because transition-metal ions can accelerate oxidative degradation; this operational boundary is particularly relevant to injection moulding barrels with copper-alloy feed throat components.
