| HS Code | 434556 |
| Vinyl Acetate Content | 18% |
| Melt Flow Rate 190 C 2 16 Kg | 2.0 g/10min |
| Density | 0.938 g/cm³ |
| Melting Point | 85°C |
| Vicat Softening Temperature | 65°C |
| Brittleness Temperature | -70°C |
| Tensile Strength At Break | 18 MPa |
| Elongation At Break | 700% |
| Shore A Hardness | 90 |
| Softening Point | 64°C |
| Vinyl Acetate Content | 18% |
| Melt Flow Rate | 2.0 g/10min |
| Density | 0.938 g/cm³ |
| Melting Point | 85°C |
| Vicat Softening Temperature | 63°C |
| Tensile Strength At Break | 18 MPa |
| Elongation At Break | 800% |
| Hardness | 92 Shore A |
| Brittleness Temperature | -70°C |
| Flexural Modulus | 60 MPa |
| Vinyl Acetate Content | 33% |
| Melt Flow Rate | 2.0 g/10 min |
| Density | 0.960 g/cm³ |
| Melting Point | 65°C |
| Vicat Softening Point | 40°C |
| Tensile Strength At Break | 14 MPa |
| Elongation At Break | 900% |
| Hardness | 70 Shore A |
| Brittle Temperature | -75°C |
| Glass Transition Temperature | -45°C |
As an accredited EVATHENE UE3302 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | 25 kg net weight in polyethylene-lined paper bags, palletized and stretch-wrapped to protect during storage and transit. |
| Container Loading (20′ FCL) | 20′ FCL container loading of EVATHENE UE3302 EVA copolymer, securely palletized bags, ensuring safe, efficient transport and product integrity. |
| Shipping | EVATHENE UE3302 (EVA copolymer) ships as solid pellets in multi-ply paper bags or bulk containers. It is not classified as dangerous goods, but keep dry, avoid high temperatures and sharp impact. Standard dry van, rail, or container transport is suitable. Handle with care to prevent bag damage and dust accumulation. |
| Storage | Store EVATHENE UE3302 in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture contamination and physical damage. Avoid storage near oxidizing agents. Recommended storage temperature is below 30°C. Under proper conditions, shelf life is typically 12 months from receipt. |
| Shelf Life | Shelf life is typically 2 years when stored in a cool, dry place, away from direct sunlight and moisture. |
EVATHENE UE3302 is charged to the extruder as a 33 wt% vinyl acetate grade with a melt flow rate of 2.0 g/10 min (ASTM D1238, 190°C/2.16 kg) and density near 0.95 g/cm³ (ASTM D1505). In photovoltaic encapsulation film production, the resin is not processed as a neat pellet stream on the film line. A separate compounding step disperses 0.5–1.5 phr dicumyl peroxide or equivalent organic peroxide, 0.3–0.8 phr organosilane adhesion promoter such as vinyltrimethoxysilane, and 0.1–0.3 phr hindered phenolic antioxidant into the EVA matrix. Compounding is typically performed on a co-rotating twin-screw line with L/D 40:1 to 44:1 and melt temperature controlled below 110°C to prevent premature peroxide decomposition. The resulting pelletized compound is then cast into film at thicknesses of 400–800 µm on a cast film extruder equipped with a gear pump, chilled roll, and contact winding. At relative humidity above 60%, pellets are pre-dried to below 0.1 wt% moisture because retained surface moisture can produce void defects during lamination. Module assembly uses a vacuum laminator at 140–160°C for 10–20 min, followed by edge trimming and frame mounting. Gel content after curring, measured by solvent extraction in boiling xylene adapted from ISO 10147, is held in the 70–90% range for production release. Compliance is verified under IEC 61215-1:2021 thermal cycling, IEC 61215-2:2021 damp heat exposure at 85°C/85% RH for 1000 h, and UL 1703 module electrical safety. Terminal articles are glass/encapsulant/cell/encapsulant/backsheet photovoltaic modules, predominantly monocrystalline or polycrystalline panels.
Hot melt adhesive formulations using UE3302 are produced in horizontal kneaders or co-rotating twin-screw extruders with barrel temperatures maintained between 130–170°C. Starting-point addition ratios are 25–35 wt% EVA, 20–40 wt% hydrocarbon tackifier, 15–25 wt% Fischer-Tropsch or paraffin wax, and 0.1–0.5 wt% antioxidant. The 33 wt% vinyl acetate content permits homogeneous dispersion of C5/C9 hydrocarbon resins without phase separation, but melt temperature must not exceed 200°C for extended residence periods because deacetylation can produce acetic acid and gel bodies. Viscosity at 180°C is controlled in the 500–2,000 mPa·s range by wax grade selection and tackifier softening point. Application is completed through slot-die coating, roller coating, or spray systems onto roll-fed boardstock or book spines at 150–170°C. Open time is determined more by wax crystallization rate than by EVA addition level; formulations with higher Fischer-Tropsch wax content shorten open time to 3–8 seconds, while lower wax levels extend open time to 10–15 seconds. For indirect food-contact packaging adhesives, formulation components are assessed under FDA 21 CFR 175.105 and for overall migration under EU 10/2011. Terminal product forms include granulated hot melt, pillow packs, and 12 mm glue sticks for case sealing, bookbinding, and nonwoven assembly.
Formulations used in low-smoke zero-halogen cable sheathing combine 100 phr UE3302 with 100–180 phr aluminum trihydroxide having a median particle size of 1–2 µm and 20–60 phr magnesium dihydroxide. A vinyl silane coupling agent at 0.5–1.5 phr is added to improve filler-matrix adhesion and to reduce water uptake at the filler interface. Mixing is carried out on a reciprocating single-screw co-kneader or twin-screw extruder with L/D 40:1 to 48:1; melt temperature is held below 150°C because ATH begins to release water of hydration near 180–200°C, causing porosity and surface bumps on the finished sheath. Cable extrusion can be performed on a 90 mm single-screw extruder with 24:1 L/D and head pressure of 2.5–3.5 MPa. Crosslinking uses dicumyl peroxide at 0.8–2.0 phr in a continuous vulcanization line or silane grafting with vinyltrimethoxysilane at 1.0–1.8 phr. Compliance benchmarks include IEC 60332-1-2 for vertical flame propagation, IEC 61034-2 for smoke density, IEC 60754-2 for halogen acid gas emission, and IEC 60502-1 for rated cables up to 1.8/3 kV. Terminal articles are halogen-free sheathed photovoltaic cables, railway control cables, and building wire with limiting oxygen index values above 30% measured by ASTM D2863.
| Test standard | Measured property | Typical LSZH pass criterion | UE3302 compound control point |
|---|---|---|---|
| IEC 60332-1-2 | Vertical flame propagation | Char height ≤ 425 mm | Combined ATH+MDH ≥ 140 phr |
| IEC 61034-2 | Smoke density | Light transmittance ≥ 60% | Low-smoke filler system |
| IEC 60754-2 | Halogen gas emission | pH ≥ 4.3; conductivity ≤ 10 µS/mm | Halogen-free formulation |
| ASTM D2863 | Oxygen index | ≥ 30% | Vinyl silane coupling at 0.5–1.5 phr |
At addition levels of 5–10 wt% in straight-run bitumen, UE3302 is dispersed in a high-shear mixer at 170–190°C for 2–4 h. The high vinyl acetate content of 33 wt% improves compatibility with the maltene phase and delays phase separation during storage at 150–170°C. The polymer-modified binder is then applied to a polyester or glass-fiber mat and calendered into a membrane of 3–5 mm thickness. Compliance is evaluated under ASTM D5147 for polymer-modified bitumen membranes, EN 13707 for roofing sheets, and ASTM D6084 for elastic recovery. Published plant-scale torque and phase-separation data for UE3302 in SBS-free bitumen formulations is limited; mixing trials should validate stability under site-specific shear and storage temperatures before full production. Terminal products are torch-applied waterproofing membranes and self-adhesive roofing underlayments.
A 33 wt% vinyl acetate carrier grade such as UE3302 finds use in flame-retardant masterbatches at carrier loadings of 30–50 wt% with 50–70 wt% magnesium hydroxide or ATH concentrate. On a 52 mm co-rotating twin-screw extruder with L/D 44:1, screw speed is set between 350–450 rpm and melt temperature is held at 110–140°C. The high vinyl acetate content lowers melt viscosity and improves particle wetting; die-hole freeze-off is less frequent than with LDPE carriers. Let-down ratio into base polyolefin cable compounds is 20–40 wt%. Melt flow rate is checked per ISO 1133-1:2022, and REACH SVHC absence is documented in the safety data sheet. Terminal products are free-flowing granular masterbatches used in cable sheathing and automotive interior compounds.
Five-layer blown film or cast film lines use UE3302 at 20–40 wt% of the tie-layer formulation, blended with LDPE or maleic anhydride-modified polyolefin at 60–80 wt%. Tie-layer thickness is 8–25 µm in a total film thickness of 60–150 µm. Processing on blown film lines uses die gap 1.8–2.4 mm, blow-up ratio 2.2–2.8, and melt temperature 170–190°C. Adhesion to nylon or EVOH is evaluated by ASTM F904 flat-plate peel; target lamination bond strength exceeds 2 N/15 mm depending on film structure. Food-contact compliance is assessed under EU 10/2011 and FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers. Terminal products are vacuum skin packages, modified atmosphere lidding films, and retort pouches limited to 121°C for 30 min unless crosslinked.
Medical pouches and device overwrap made from UE3302-based cast film at 100 phr EVA with 0.05–0.15 phr erucamide slip and 0.1–0.2 phr silica antiblock. Film thickness is 100–250 µm. Sterilization by ethylene oxide or steam at 121°C is typical; radiation sterilization requires antioxidant and anti-rad additive screening to avoid yellowing and tensile loss. Biological evaluation is performed according to ISO 10993-5 and ISO 10993-10, with USP Class VI testing for plastic components. Packaging integrity is validated under ISO 11607. Terminal articles are peelable medical device pouches and flexible fluid-containment components that are phthalate-free.
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EVATHENE UE3302 is a pelletised ethylene-vinyl acetate copolymer supplied by USI Corporation. The grade is specified with a nominal vinyl acetate comonomer content of 33 wt%, a melt index of 2.0 g/10 min measured at 190 °C under 2.16 kg load by ISO 1133-1:2022, and a density of approximately 0.95 g/cm³ by ISO 1183-1:2019. The material is used in hot melt adhesives, crosslinked and uncrosslinked foam, footwear compounding, and as a polar modifier in polyolefin and PVC systems. Relative to lower vinyl acetate EVA grades, the 33 wt% acetate content suppresses crystallinity, lowers the melting point, increases surface polarity, and shifts mechanical response from stiff thermoplastic to flexible elastomer.
Because the vinyl acetate side groups disrupt ethylene chain packing, semicrystalline order is reduced. Differential scanning calorimetry at 10 °C/min in accordance with ASTM D3418-21 places the main melting endotherm for this comonomer level between 60 °C and 75 °C, whereas an 18 wt% vinyl acetate grade typically melts between 85 °C and 90 °C. Hardness for the 33 wt% class commonly falls between 70 Shore A and 80 Shore A when measured by ASTM D2240-15, and tensile elongation at break exceeds 600% under ASTM D638-14 at 500 mm/min. The acetate side groups increase cohesive energy density and promote wetting of aluminium, polyester, and polyurethane surfaces, but they also make the chain more sensitive to thermal deacetylation. Above 230 °C, acetic acid elimination increases, producing gel specks, discoloration, and equipment corrosion in continuous extrusion.
In a 25:1 to 30:1 L/D single-screw extruder, UE3302 is processed with a temperature profile from 160 °C in the feed zone to 210 °C at the die. Melt temperature should remain below 230 °C; on high-shear twin-screw lines, kneading blocks can raise local melt temperature 20–40 °C above the barrel set point. This thermal excursion is a common cause of batch-to-batch viscosity drift because deacetylation generates free acetic acid that catalyses further degradation. Drying is not required for pellets stored in sealed packaging at 25 °C and 50% relative humidity, but exposure to ambient air above 60% relative humidity requires desiccant drying at 70–80 °C for 4–6 h. Moisture-induced splay in EVA is less severe than in polyamide or PET, but surface condensation can still produce bubbles and streaks in extruded sheet.
Rheological characterisation is typically performed by parallel-plate oscillation at 180 °C under 1% strain and 100 rad/s. EVA grades with melt index 2.0 g/10 min display shear-thinning behaviour, and the storage modulus at 1 rad/s is lower than that of an 18 wt% vinyl acetate grade at the same melt index, which increases melt relaxation and reduces die swell. For hot melt adhesive production, this translates into reduced stringing at high application speeds, although published UE3302-specific rheological curves are limited.
Product selection is based on the balance between adhesion, low-temperature flexibility, heat resistance, and melt handling. The following values are class-typical ranges derived from EVA copolymer literature and compounding trials; they are not a substitute for a UE3302 certificate of analysis or lot-specific test data.
| Parameter | Low-VA EVA (18 wt%) | EVATHENE UE3302 (33 wt%) | High-VA EVA (40 wt%) |
|---|---|---|---|
| DSC melting peak range | 85–90 °C by ASTM D3418-21 | 60–75 °C by ASTM D3418-21 | 45–60 °C by ASTM D3418-21 |
| Shore A hardness | 90–95 A | 70–80 A | 50–60 A |
| Melt processing window | 150–190 °C | 170–210 °C | 120–160 °C |
| Polar substrate adhesion | moderate | high | very high |
| Thermal degradation tendency | low | intermediate | high |
Relative to an 18 wt% vinyl acetate grade of equivalent melt index, UE3302 shows lower flexural modulus measured by ISO 178:2019, higher probe tack, and stronger adhesion to aluminium and polyester in hot melt bonding. Peel strength measured by ASTM D1876-08 typically increases when the lower-VA grade is replaced by UE3302, but published UE3302-specific values are limited. Against a 40 wt% vinyl acetate grade, UE3302 retains greater cohesive strength and is less prone to pellet blocking during warehouse storage because the surface tack is lower. The thermal degradation tendency lies between the two reference points, making melt temperature control more critical than in low-VA EVA but less critical than in 40 wt% high-VA EVA.
Compared with ethylene-methyl acrylate or ethylene-ethyl acrylate copolymers of equivalent comonomer content, UE3302 provides higher surface polarity and better adhesion to aluminium and polyester, but lower continuous-use temperature. The vinyl acetate unit undergoes acetic acid elimination at 230 °C; acrylate copolymers do not release an equivalent acidic by-product, giving them better thermal stability but less efficient hot tack on polar surfaces. Against metallocene polyethylene plastomers with density below 0.900 g/cm³, UE3302 may offer easier bonding and lower modulus but exhibits lower tensile toughness measured by ASTM D638-14 and poorer UV stability.
In hot melt adhesive production, UE3302 is charged to a jacketed sigma-blade mixer at 160–180 °C with tackifier and wax. Viscosity is measured by ASTM D3236-15 using a Brookfield thermosel at 180 °C; a starting formulation containing 30–35 wt% UE3302, 40–45 wt% rosin ester tackifier, and 20–25 wt% Fischer-Tropsch wax typically falls between 800 mPa·s and 2000 mPa·s. The 33 wt% acetate content increases compatibility with rosin esters and improves adhesion to polar packaging films, but it narrows the compatibility window for paraffinic waxes. Paraffinic wax levels above 10 phr can exude and cause bond failure under cold flex; open time and set time are controlled primarily by wax carbon number distribution and tackifier softening point. Supplier-specific design-space data for UE3302 hot melt formulations are limited.
In crosslinked EVA foam, UE3302 is compounded on a two-roll mill at 90–100 °C to incorporate dicumyl peroxide, activated azodicarbonamide, and fillers without scorch. Dicumyl peroxide is added at 0.7–1.2 phr, while activated azodicarbonamide is used at 2–5 phr depending on density target. The blowing agent decomposition is adjusted with zinc oxide or zinc stearate into the 160–180 °C cure range, and compression press platens are held at 150–170 °C to synchronise crosslinking with gas evolution. If the melt viscosity rises too slowly, cell coalescence produces an irregular open-cell structure; if the viscosity rise is too rapid, the foam cannot expand to full thickness. A peroxide loading below 0.5 phr is associated with low crosslink density and cell collapse, while loadings above 1.5 phr increase gel content, surface embrittlement, and shrinkage after demoulding. The window is narrower than for low-VA EVA because the acetate groups already lower crystallinity and raise melt tack. On a production scale, the main failure mode is batch-to-batch variation in two-roll mill temperature, which causes uneven peroxide dispersion and hot spots that initiate premature crosslinking.
Injection moulding of UE3302 is run at melt temperatures between 170 °C and 200 °C, with mould temperatures between 20 °C and 40 °C. The material does not require the same clamping force as rigid polyolefins of equivalent melt index because the hydraulic pressure needed to fill the cavity is lower; however, gate freeze-off is slower than semicrystalline polyethylene, and hot-runner systems should avoid stagnant zones above 230 °C. Sprue and runner systems with sharp turns can generate local shear heating that produces acetic acid odour and brown specks. Production lines equipped with hydraulic injection units with clamp force below 100 tonnes can accommodate a wide range of UE3302 parts, but rapid ejection may cause surface defects if the part has deep undercuts.
Outdoor weathering is not a primary design space for UE3302 because neat EVA undergoes photolytic deacetylation and surface cracking. Where external applications require resistance, 0.2–0.5 wt% of a high-molecular-weight hindered phenolic antioxidant and 0.2–0.5 wt% of a hindered amine light stabiliser are standard. The stabiliser package should be added before the melt exceeds 180 °C to limit oxidative chain scission during compounding. Carbon black at 2–3 wt% provides UV shielding in foam and film, but it complicates colour matching and raises dielectric loss.
Filled compounds based on UE3302 can accept calcium carbonate and talc, but the higher vinyl acetate content increases surface polarity and can promote filler agglomeration. In a 40:1 L/D co-rotating twin-screw extruder with side feeding, total filler addition is typically held below 30 wt% to avoid a discontinuous melt phase and pressure oscillations exceeding 20% of the set point. At filler loadings above this value, the elongational viscosity drops and the melt may tear at the die lip during strand pelletising. Paraffinic or naphthenic plasticisers reduce hardness but migrate to the surface at levels above 10 phr; accelerated storage at 40 °C for 48 h can reveal surface haze and tack. Aromatic plasticisers are generally avoided because they can accelerate deacetylation and generate odour. UE3302 should not be dry-blended with amine-based additives that may initiate premature crosslinking through reaction with residual acetoxy species; such systems require the amine additive to be introduced after the EVA has been fully melted and sufficiently diluted.
Converters requiring food-contact or medical-grade status should obtain a grade-specific compliance letter from USI Corporation. EVA copolymers of this comonomer level are commonly assessed under FDA 21 CFR 177.1350 and EU Regulation (EU) No 10/2011, including the overall migration limit of 10 mg/dm²; final compliance depends on the complete formulation and converting conditions. REACH registration documentation and RoHS screening for heavy metals must also be verified at lot level. No grade-specific statement should be inferred from generic class data.
