| HS Code | 906399 |
| Product Name | SINOPEC EVA UE2815GA |
| Material | EVA Copolymer Resin |
| Grade | Hot Melt Adhesive Grade |
| Va Content | 28% |
| Melt Index | 15 g/10 min |
| Density | 0.95 g/cm³ |
| Melting Point | 70 °C |
| Vicat Softening Point | 50 °C |
| Hardness | 80 Shore A |
| Tensile Strength | 12 MPa |
| Elongation At Break | 700% |
| Form | Pellets |
As an accredited SINOPEC EVA UE2815GA EVA Copolymer Resin,28% VA,15 MI,Hot Melt Adhesive Grade factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packed in 25 kg net kraft paper bags. SINOPEC EVA UE2815GA, 28% VA, 15 MI, hot melt adhesive grade resin. |
| Container Loading (20′ FCL) | 20′ FCL of Sinopec EVA UE2815GA resin, 28% VA, 15 MI, hot melt adhesive grade, packed in bags on pallets. |
| Shipping | SINOPEC EVA UE2815GA is supplied as virgin pellets in 25 kg woven bags, palletized and shrink-wrapped for export. Ship via dry container or covered truck, keeping away from heat, moisture, and direct sunlight. Ensure proper ventilation and handling to preserve product integrity during transit. |
| Storage | Store SINOPEC EVA UE2815GA in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture absorption and contamination. Avoid high stacking to prevent pellet deformation. Maintain moderate temperatures to avoid softening; use within recommended shelf life. |
| Shelf Life | Shelf life is typically 2 years when stored in original sealed packaging, in a cool, dry area away from sunlight and heat. |
In corrugated case and carton sealing applications, the 28% vinyl acetate content of SINOPEC EVA UE2815GA shifts the polymer solubility parameter toward polar cellulose and starch surfaces, while the melt index of 15 g/10 min under ISO 1133-1:2022 conditions limits melt-pool viscosity during long residence times in 160–180 °C heated supply tanks. Formulation addition ratios observed on high-speed packaging lines fall between 25 wt% and 35 wt% for the EVA resin, with hydrogenated hydrocarbon or rosin ester tackifier at 35–45 wt%, paraffin or microcrystalline wax at 20–30 wt%, and hindered phenol/phosphite antioxidant at 0.3–0.8 wt%. Amine-based adhesion promoters are excluded from this formulation class because they accelerate vinyl acetate hydrolysis and generate acetic acid during prolonged tank residence. The downstream conversion process starts with twin-screw compounding at an L/D of 40:1 and barrel temperatures below 150 °C to avoid vinyl acetate side-group elimination, followed by slot-die or bead application on case erectors and tray formers at 160–175 °C. Open time is set between 0.5 s and 2.5 s on recycled kraft board, and fibre-tear retention is verified by ASTM D1876 T-peel testing. For food-contact corrugated packaging, the compounded adhesive is screened under FDA 21 CFR 175.105 for indirect additive status, with REACH Regulation (EC) No 1907/2006 SVHC documentation supplied for European Union shipments. Terminal finished products include RSC and die-cut shipping cases, wraparound trays, and cluster-pack cartons; UE2815GA-rich packaging formulas are not specified for frozen-food cases subjected to flexural stress below −20 °C because low-temperature cracking resistance is inferior to metallocene polyolefin grades.
Production records from carton-sealing lines indicate that viscosity drift exceeding 10% within an 8 h shift is the first practical sign of thermal degradation, especially when tank level falls below the heating element height and creates a recirculating hot zone. Char particles as small as 200 µm can pass through coarse filters and block slot-die lips, producing intermittent adhesive skips on the carton minor flap. To limit this failure mode, heated hoses are maintained below 170 °C and tank standby temperatures are reduced by 10–15 °C during production pauses. Batch-to-batch variance in wax melting point of only 3 °C is sufficient to shift fibre-tear pass rates on clay-coated board; therefore, wax quality is controlled by R&B softening point according to ASTM E28-18.
Because the adhesive film on the book block spine must penetrate milled paper pores while retaining enough green strength to survive guillotine trimming, the 28% vinyl acetate repeat unit is selected for its adhesion to cellulose and clay-coated covers. SINOPEC EVA UE2815GA is typically compounded at 30–38 wt% with rosin glycerol ester tackifier at 40–45 wt%, paraffin wax at 10–15 wt%, and antioxidant at 0.3–0.5 wt%; this addition ratio yields a viscosity profile that can be applied through wheel pot or slot die systems at 170–185 °C. The downstream binding process sets the adhesive in the spine cavity of gathered signatures after milling and notching at line speeds between 8,000 and 15,000 cycles per hour, then side glues the hinge. Heat-fail temperature in shear is measured by ASTM D4498-07, and page-pull results are compared on coated paper at 23 °C and 5 °C to ensure that the adhesive does not embrittle under warehouse stacking conditions. Regulatory compliance requires REACH Annex XVII restrictions screening for European export; children’s books additionally require lead and phthalate testing under U.S. CPSIA or REACH Annex XVII Entries 51 and 52. Terminal finished products include perfect-bound trade softcovers, paperback spines, and hardcover book blocks; the EVA system is not a substitute for polyurethane-reactive adhesives in hardcover bindings expected to withstand −30 °C repeated flex cycles without crack initiation.
On gathering lines with intermittent stops, the same adhesive must remain pumpable in the heated pot without skin formation for up to 12 h. Operators observe that surface skinning can be reduced by maintaining a nitrogen blanket over the glue pot and by keeping the pot temperature no more than 5 °C above the open-time requirement. Because the spiral cavity fills from the centre outward, premature solidification at the low temperature boundary produces a concave spine profile that can telegraph through the cover after backforming; the process control therefore relies on continuous applicator temperature monitoring with tolerance of ±5 °C.
Cabinet lines running thin ABS, PVC, and melamine-faced edge tapes over particleboard or MDF use the polar vinyl acetate repeat units of SINOPEC EVA UE2815GA to promote immediate wetting when the ribbon is pressed against the profiled panel edge. Production recipes in this segment use 32–40 wt% UE2815GA combined with 28–38 wt% glycerol rosin ester tackifier, 5–10 wt% Fischer-Tropsch or microcrystalline wax, 8–15 wt% calcium carbonate filler, and 0.2–0.5 wt% antioxidant. The edge-banding machine applies the melt at 190–210 °C through a rectangular slot or duo roller, after which a consolidating pressure roller sets the tape at 0.15–0.35 MPa and line speed between 12 m/min and 30 m/min. Particleboard moisture is maintained below 8% to prevent steam blow during tape consolidation. The main process conflict is that char formation from vinyl acetate degradation accelerates above 210 °C, while ABS and thick PVC tape wetting is inadequate below 180 °C; cartridge filters of 200–500 µm and nitrogen-blanketed premelt reservoirs are therefore used to control carbonized gel particles. Compliance is anchored to EN 204 class D3 for interior damp environments and is screened through EN 14257/WATT 91 lap-shear heat resistance. The terminal finished products include laminated kitchen cabinet doors, office desk tops, and wardrobe side panels; wet-area furniture edge joints are outside the service envelope unless sealed with a polyurethane overcoat.
Field reports from edge-banding operators show that TiO₂-filled ABS tapes with high surface tension variability can shift the peel failure mode from fibre tear to adhesive interfacial failure when the melt temperature drops by 3–5 °C below the setpoint. The corrective action is not to raise the pot temperature uniformly but to increase the temperature of the application head alone by 5 °C while reducing line speed by 2–3 m/min, preserving the lower melt reservoir at 180 °C to avoid bulk degradation. In such lines, batch-to-batch MFR variation in the EVA lot above ±1.5 g/10 min may cause visible adhesive squeeze-out on thin 0.4 mm tapes; therefore, incoming resin is tested by ASTM D1238-20 at 190 °C/2.16 kg rather than relying solely on supplier certificates.
Wrap lines applying decorative PVC, PET, and paper foils to MDF, HDF, aluminium, and wood-plastic composite profiles require a hot melt with a broad wetting window and a moderately delayed set time. SINOPEC EVA UE2815GA is compounded at 20–30 wt% with rosin glycerol ester or terpene-phenolic tackifier at 30–40 wt%, paraffin wax at 8–12 wt%, low-density polyethylene or ethylene wax at 3–8 wt%, filler at 10–20 wt%, and antioxidant at 0.3–0.5 wt%. The downstream production line applies the adhesive through a slot nozzle at 170–190 °C either to the reverse side of the foil or directly to the profile, followed by calendar rolls that consolidate the laminate at 0.2–0.5 MPa while line speed is held between 10 m/min and 25 m/min. Peel adhesion on PVC foil is tested by ASTM D1876 at 23 °C, and lap shear on MDF is assessed according to ISO 4587:2003; a decline in shear below the substrate fracture limit is commonly caused by over-waxing or by preheating the foil above its plasticizer migration threshold. Compliance for adhesive components in wrapped interior panels includes REACH Regulation (EC) No 1907/2006, and final article indoor air quality may be tested under EN 16516 for furniture and flooring products. Terminal finished products are wrapped architraves, skirting boards, picture frames, and furniture mouldings; delamination from primed PVC after 48 h water immersion is a known failure mode when wax content exceeds 12 wt% or when the foil is applied at nip pressures below 0.2 MPa.
In automotive interior lamination for low-stress trim components, SINOPEC EVA UE2815GA is typically restricted to applications where polar adhesion to PVC skins, nonwoven scrims, and polyurethane foam outweighs the fogging penalty inherent to EVA-based systems. In slot-die or swirl-spray lamination lines, the addition ratio ranges from 20 wt% to 28 wt%, combined with hydrogenated hydrocarbon tackifier at 35–45 wt%, microcrystalline wax at 8–15 wt%, calcium carbonate at 5–12 wt%, and a low-volatile stabilizer package at 0.4–0.8 wt%. The lamination process for door trim inners and package trays uses heated roll or flat-bed presses at 160–180 °C and 0.3–0.6 MPa, with total press closure times of 20–60 s and adhesive coverage levels of 80–120 g/m². Heat resistance is improved by adding 5–10 wt% functionalized polyolefin or high-melting wax to raise the heat-fail temperature above 75 °C, but the EVA backbone loses shape stability above 70 °C unless crosslinkable additives are introduced. Compliance includes FMVSS 302 flammability resistance and IATF 16949:2016 process-control documentation; SVHC screening under REACH is mandatory for EU-bound parts. Terminal finished products include door trim lower panels, package trays, and acoustic insulation mats; instrument panel skins with high grain retention are outside the practical limit for an unmodified EVA hot melt.
Published production-scale fogging data for this specific SINOPEC grade in OEM Class A trim is limited; therefore, qualification is performed on a per-part basis using VDA 278 thermodesorption for condensable emissions and VDA 277 for volatile organic compounds. Lines that must pass stringent OEM limits typically replace mineral oil plasticizer with high-molecular-weight wax and select rosin-free tackifiers, but this shifts open time shorter and may require higher application temperatures of 5–10 °C to restore wetting on low-surface-energy nonwoven scrims.
Roll coating systems for mattress ticking, furniture upholstery, and nonwoven reinforcement use the polar VA groups of SINOPEC EVA UE2815GA to bond polyester, rayon, polypropylene, and cotton scrims to polyurethane foam or nonwoven backings. The addition ratio in this segment is lower by polymer weight than packaging: 18–25 wt% EVA, 35–45 wt% hydrogenated rosin or C9 hydrocarbon tackifier, 8–15 wt% wax, 5–10 wt% naphthenic or paraffinic oil, and 0.3–0.5 wt% antioxidant. The adhesive is applied by engraved roller or slot nozzle at 150–170 °C to the moving fabric, followed by nip lamination at 0.3–0.8 MPa and line speeds of 50–150 m/min; for open-pore nonwovens, gravure roll pickup of 2–5 g/m² prevents strike-through. Compliance testing aligns with REACH Regulation (EC) No 1907/2006 Annex XVII restrictions, and where textile certification is required, the finished laminate is screened under OEKO-TEX Standard 100 limits for residual monomers and sensitisers. Terminal finished products are quilted mattress cover laminates, upholstered furniture cushion reinforcements, and technical nonwoven composites; creping or peaking on polypropylene nonwovens occurs when application temperature exceeds 175 °C and the melt is too aggressive for low-melting spunbond fibres.
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SINOPEC EVA UE2815GA is an ethylene-vinyl acetate copolymer resin specified with a nominal vinyl acetate comonomer content of 28 wt% and a melt index of 15 g/10 min under ISO 1133-1:2022 at 190 °C and 2.16 kg. The pelletized resin has a nominal density of 0.950 g/cm³ tested according to ISO 1183-1:2019. The grade is supplied as a hot melt adhesive backbone polymer; its melt flow and comonomer content are intended for compounded formulations with tackifier resins, waxes, and stabilizers rather than for direct adhesive use. The 28 wt% VA level lowers polyethylene crystallinity and increases polar substrate wetting compared with 18 wt% VA EVA resins, while the 15 g/10 min melt index provides a medium viscosity that is processed through standard hot melt mixers and applicators.
Thermal analysis of EVA copolymers with 28 wt% VA generally records a broad melting endotherm from approximately 55 °C to 80 °C when tested by differential scanning calorimetry at 10 K/min under nitrogen according to ASTM D3418-21; the peak melting temperature is commonly near 70 °C. Because the comonomer distribution is largely random, a defined crystalline fraction persists and provides heat resistance, while the amorphous phase retains mobility below −20 °C. The glass transition temperature of the amorphous EVA phase is not a single value; it is observed as a broad loss peak in dynamic mechanical analysis, generally between −30 °C and −10 °C depending on VA content and test frequency. The low-temperature flexibility of finished hot melt adhesives is therefore maintained under refrigeration and freezing conditions. Thermal degradation proceeds through acetate elimination, not random polyethylene-like chain scission. The measured onset of thermal weight loss in EVA copolymers is frequently near 330 °C under nitrogen at 10 K/min; however, sustained processing at 230 °C already accelerates deacetylation. The formation of acetic acid and polyenes causes discoloration, viscosity reduction, and potential corrosion of steel applicator parts. Published kinetic data for EVA deacetylation report activation energies in the range of 170–220 kJ/mol under inert conditions, with exact values dependent on VA content and antioxidant package. Consequently, melt compounding and application should be confined to 150 °C–180 °C whenever possible.
Melt index is determined under ISO 1133-1:2022 at 190 °C and 2.16 kg; a value of 15 g/10 min places the resin in the medium-flow category. For capillary rheometry, the apparent melt viscosity may be evaluated under ISO 11443:2021; published data for this specific grade are limited, but the standardized melt index indicates that the unfilled resin requires less temperature reduction than 3–5 g/10 min grades, while retaining higher cohesive strength than 43–800 g/10 min grades. In hot melt formulation, the low-shear viscosity of the compounded adhesive is typically measured at 180 °C with a Brookfield Thermosel under ASTM D3236-15; viscosity targets vary with application, commonly from 1,000 mPa·s to 8,000 mPa·s. The polymer contribution to this viscosity is influenced by tackifier molecular weight, wax melt point, and plasticizer level.
On a production-scale twin-screw extruder having L/D 40:1 and side feeding, UE2815GA is introduced at the main feed throat while tackifier resin and wax are metered downstream. In batch compounding, a sigma-blade kneader operating at 160 °C–180 °C provides sufficient shear to disperse tackifier without excessive chain degradation. The resin is hydrophobic; pre-drying is generally not required for moisture control, but cold pellets exposed to high humidity can carry surface condensation into the feed throat, causing feed instability. The critical processing risk is oxidative and thermal degradation in stagnant zones of the melt path. Operators monitor screw torque, head pressure, and melt temperature; pressure excursions above 60 bar in short heated hoses may indicate screens, gear pumps, or applicator nozzles beginning to build char. Addition of 0.2–1.0 phr hindered phenolic antioxidant with a phosphite secondary stabilizer is standard in hot melt formulations to limit viscosity drift. Published data for this specific equipment configuration are limited; the stated pressure limit is equipment-dependent and must be confirmed for the installed screw, filter, and hose arrangement. Amine-based additives should be avoided in many formulations because they can interact with tackifiers and contribute to discoloration or viscosity instability.
Compared with an 18 wt% VA EVA copolymer at similar melt index, UE2815GA exhibits lower crystallinity, lower hardness, and greater elongation at break. Representative Shore A hardness values shift from roughly 90 Shore A to 80 Shore A as VA content increases from 18 wt% to 28 wt% when determined by ISO 868:2003; tensile strength under ISO 527-2:2012 decreases while elongation increases. These are broad literature ranges for random EVA copolymers, and supplier datasheet values for UE2815GA should be consulted for exact specifications. The higher VA concentration improves adhesion to cellulose, polyester, polyamide, and lightly plasticized PVC because the polar acetate groups raise the surface energy of the polymer and reduce interfacial tension against polar substrates. This differentiates UE2815GA from lower-VA grades used in less demanding packaging or non-polar substrates. Compared with 28 wt% VA grades at melt index 43 g/10 min or 800 g/10 min, the 15 g/10 min resin has higher melt strength, longer open time, and greater cohesive strength. A 43 g/10 min product may be chosen for low-add-on, high-speed carton closing where fast set and low application viscosity are required, but it often has higher odor potential and lower heat resistance. A 33 wt% VA grade provides softer films and improved compatibility with certain tackifiers, yet lowers heat resistance and may increase surface tack, requiring formulation adjustment with higher-melting waxes. The differences are not purely additive; tackifier compatibility at elevated turret temperatures may shift because higher VA content can accept higher rosin ester loadings without phase separation.
In hot melt adhesive compounding, the choice of a 28 wt% VA, 15 g/10 min EVA is driven by the need for medium viscosity at application temperatures between 160 °C and 180 °C. The resin contributes to peel adhesion on kraft paper and wood fiber under tests such as ASTM D903-98 or ASTM D1876-08, depending on the laminate and conditioning history. Its higher polarity compared with 18 wt% VA grades reduces wettability failure on cellulose and reduces the need for polar tackifiers. However, adhesion to untreated polyethylene and oriented polypropylene remains limited; substrates with surface energy below 32 mN/m require corona or plasma pretreatment. This limitation is characteristic of EVA-based hot melts and is not resolved by VA content alone.
Tackifier compatibility follows the polarity imparted by the 28 wt% VA units. Rosin ester tackifiers with ring-and-ball softening points from 90 °C to 115 °C per ASTM E28-18 form homogeneous melts at 170 °C; high levels of hydrocarbon tackifiers may reduce clarity and increase tackifier migration. Paraffin waxes lower viscosity and set time but can reduce adhesion if the wax domain becomes continuous. Fischer-Tropsch waxes with melting points around 100 °C provide a narrower set temperature range and better heat resistance than paraffin waxes. The resin accepts these additives under high-shear mixing; no separate coupling agent or grafting step is required.
Hot melt adhesives formulated with UE2815GA are applied by slot-die, roll, wheel, or bead extrusion equipment. The 15 g/10 min melt index limits the temperature required to reach acceptable viscosity. At deposition weights of 50–200 g/m², slot-die lips are commonly held at 160 °C–180 °C; die pressure is maintained below manufacturer limits and may range from 10 bar to 40 bar depending on lip gap, coat weight, and line speed. Spiral spray application with this grade may require additional heating or lower add-on to avoid filament breakage and misting. Open time is formulation-dependent, but the medium MI and high VA content typically extend open time compared with lower-VA grades at the same wax loading, allowing assembly of large surfaces before compression. Set time is a function of wax melting point, substrate temperature, and adhesive thickness, not of the polymer alone; measured set times are therefore reported only for a fully compounded adhesive. Published data for this specific application configuration are limited; die pressure and open time must be characterized on the target line.
The base resin may be used in adhesive formulations intended for food-contact compliance under FDA 21 CFR 175.105 if the finished adhesive meets extraction limitations; the copolymer itself is a food-contact polymer under FDA 21 CFR 177.1350 when specified conditions are met. These statements are formulation-dependent and do not transfer automatically from resin to finished hot melt. The grade is assessed under REACH Regulation (EC) No 1907/2006 and RoHS Directive 2011/65/EU; compliance must be verified with the supplier's safety data sheet and regulatory declaration.
| Standard / framework | Test or scope | Applicability to UE2815GA |
|---|---|---|
| ISO 1133-1:2022 | Melt flow index at 190 °C, 2.16 kg | Characterization of 15 g/10 min |
| ISO 1183-1:2019 | Density of non-cellular plastics | Nominal density 0.950 g/cm³ |
| ASTM D3418-21 | Transition temperatures by DSC | Melting range and crystallinity |
| ASTM D3236-15 | Hot melt adhesive apparent viscosity | Formulated adhesive viscosity at application temperature |
| FDA 21 CFR 175.105 | Adhesive components in food contact | Finished adhesive must comply with extraction limits |
| FDA 21 CFR 177.1350 | Ethylene-vinyl acetate copolymers | Applicable to base resin under specified use conditions |
| REACH Regulation (EC) No 1907/2006 | Registration, evaluation, authorization, restriction | Supplier declaration required |
| RoHS Directive 2011/65/EU | Hazardous substances in electrical equipment | Verification required for final article |
Bookbinding and packaging adhesives based on UE2815GA are compounded to target viscosities from 1,500 mPa·s to 5,000 mPa·s at 180 °C under ASTM D3236-15; the rosin ester tackifier level is adjusted to increase peel adhesion on paper and board. The adhesive is applied by polyurethane roller or slot nozzle at 160 °C–175 °C. Page pull strength and flex resistance after conditioning at −20 °C are improved by the 28 wt% VA content because the copolymer retains flexibility below the glass transition of the polyethylene crystalline phase. In carton closing, the same resin is compounded with Fischer-Tropsch wax to shorten set time; board stock with surface energy below 32 mN/m may require corona treatment to achieve acceptable fiber tear. Published data for this specific adhesive configuration are limited; performance values are generated through internal product qualification using the substrate and line speed of the intended packaging operation.
