| HS Code | 309759 |
| Vinyl Acetate Content | 33 % |
| Density | 0.962 g/cm3 |
| Melt Flow Rate 190 C 2 16 Kg | 55 g/10 min |
| Melting Point | 73 °C |
| Vicat Softening Point | 49 °C |
| Tensile Strength At Break | 13 MPa |
| Elongation At Break | 800 % |
| Flexural Modulus | 20 MPa |
| Shore A Hardness | 85 |
| Brittleness Temperature | -75 °C |
As an accredited ELVAX 9755 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX 9755 ethylene vinyl acetate copolymer is supplied as pellets in 25 kg multi-walled paper bags. |
| Container Loading (20′ FCL) | 20′ FCL: palletized ELVAX 9755 bags, securely stowed and blocked, protected from moisture and direct sunlight. |
| Shipping | ELVAX 9755 Ethylene Vinyl Acetate Copolymer ships as non-hazardous solid pellets in sealed bags, drums, or bulk containers. Keep dry, away from heat, ignition sources, and static buildup. Avoid dust accumulation. Transport in clean, covered vehicles to prevent contamination and moisture pickup. Standard handling and storage precautions apply. |
| Storage | ELVAX 9755 should be stored in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and open flames. Keep the original container tightly sealed to prevent moisture absorption and contamination. Maintain stable temperatures, ideally below 30°C, and ensure good ventilation to avoid dust accumulation and potential fire hazards. |
| Shelf Life | Shelf life is typically 2 years when stored in original, unopened containers in a cool, dry, well-ventilated area away from heat. |
Formulation rheology is governed by the interaction of the polar vinyl acetate domains in ELVAX 9755 with hydrogenated hydrocarbon tackifiers and paraffin waxes. In packaging-grade hot melts, the resin is metered at 25–40 wt%, with tackifier loading at 30–45 wt%, wax at 10–20 wt%, and antioxidant stabilization at 0.5–1.0 wt% to suppress thermal degradation during extended pot life. Compliance for food-contact carton and case sealing falls under FDA 21 CFR §175.105, with Brookfield viscosity measured by ASTM D3236 and shear adhesion failure temperature evaluated by ASTM D4498; EU exports require REACH registration under EC 1907/2006. Industrial compounding is executed on an intermeshing twin-screw extruder with L/D 40–48, barrel zones from 80–100°C in the feed section to 130–160°C at the discharge, screw speed 300–600 rpm, and a 100–200 µm melt filtration screen pack to protect downstream slot-die coating lines. Batch-to-batch viscosity variation above ±10% on production runs usually traces to resin moisture above 0.05 wt% or wax content drift; pre-drying at 60–70°C for 4–6 h is required when ambient relative humidity exceeds 60%. Prolonged melt temperatures above 160°C accelerate vinyl acetate degradation and generate acetic acid odor, which reduces tack and increases char formation. Terminal product types include hot melt granules and slugs for carton sealing, bookbinding spines, woodworking edge banding, and product assembly adhesives.
At a high-shear polymer-modified bitumen station producing binders for heavy-traffic asphalt concrete, ELVAX 9755 is dosed at 3–5 wt% of base bitumen mass; lower addition levels fail to provide required elastic recovery under AASHTO M320 performance grading, while higher levels can destabilize phase morphology during hot storage. The applicable European specification is EN 14023:2010, and North American paving contracts frequently call for ASTM D5976 Type I polymer-modified asphalt; storage stability is assessed by EN 13399 after 3 days at 180°C. Production uses a rotor-stator high-shear mixer with rotor-tip speed 18–25 m/s, processing temperature 180–190°C, and residence time 60–120 min to disperse the EVA phase before transfer to an agitated storage tank. Operational boundaries are defined by oxidative aging: sustained temperatures above 190°C accelerate gelation and viscosity climb, particularly if oxygen purging is not restricted. The terminal product types include polymer-modified bitumen for stone mastic asphalt, dense-graded highway wearing courses, bridge-deck waterproofing membranes, and torch-applied roofing sheets.
The replacement of PVC sheathing with halogen-free EVA-based compounds requires ELVAX 9755 to act as a filler-wetting matrix for alumina trihydrate and magnesium dihydrate. Formulation addition places the copolymer at 20–35 wt%, ATH/MDH at 50–65 wt%, plasticizer at 2–5 wt%, processing aid at 1–2 wt%, and antioxidant/metal deactivator at 0.5–1.5 wt%. Compliance for low-voltage cable sheathing is anchored to IEC 60754-1 for halogen acid gas evolution, IEC 60754-2 for aqueous pH and conductivity, IEC 60332-1 for vertical flame propagation, and tensile testing under ISO 527-2. Melt flow rate for incoming resin quality control follows ISO 1133-1:2022. Production on a co-rotating twin-screw extruder with L/D 40–52 uses barrel temperatures from 130–180°C, side-feeding of the mineral filler after the polymer melt seal, and vacuum degassing to control porosity and hydrolytic defects. Torque response is nonlinear: increasing filler from 50 wt% to 65 wt% can raise specific mechanical energy input by more than 30%, and ATH begins endothermic dehydration near 180–200°C; therefore the final barrel zones must remain below 180°C to avoid trapped moisture and surface roughness on pelletized compounds. Terminal product types include halogen-free sheathing and insulation for low-voltage building wire, flexible power cords, control cables, and solar cable jackets.
| Test method | Parameter | Commonly cited acceptance threshold |
|---|---|---|
| IEC 60754-1 | Halogen acid gas content | ≤ 0.5% by weight |
| IEC 60754-2 | pH | ≥ 4.3 |
| IEC 60754-2 | Conductivity | ≤ 10 µS/mm |
| ASTM D2863 | Limiting oxygen index | ≥ 30% O2 |
| ISO 527-2 | Tensile strength | ≥ 10 MPa |
| ISO 527-2 | Elongation at break | ≥ 150% |
Cast film coextrusion lines running barrier laminates at line speeds above 300 m/min often position ELVAX 9755 as the sealant web against low-density polyethylene or polypropylene structural layers. Formulation addition for the seal layer ranges from 70–100 wt% ELVAX 9755, with the balance being linear low-density polyethylene at 0–30 wt% and slip/antiblock additives at 0.5–1.0 wt%; for retortable structures, the EVA content is decreased toward the lower end of the range to limit moisture-vapor transmission and seal creep. Food-contact compliance is established under FDA 21 CFR §177.1340 for ethylene-vinyl acetate copolymers, plus EU 10/2011 overall migration limits of 10 mg/dm² for food contact; specific migration testing is dictated by the packaged food simulant. The production process involves a single-screw or coextrusion extruder with L/D 24–30, die temperature 220–260°C, air gap 100–200 mm, and chill roll temperature 15–25°C to quench the sealant layer. Neck-in and oxidation are the primary process limits: an excessively long air gap increases edge beading and lowers seal strength, while melt temperatures above 260°C generate acetic acid odor from vinyl acetate degradation. Terminal product types include lidding films for dairy and liquid aseptic cartons, frozen food pouches, medical device pouches, and aluminum foil laminates for pharmaceutical blister lidding.
Once the foaming reaction is initiated, ELVAX 9755 contributes melt strength needed to stabilize gas cells before cure. The formulation addition for crosslinked footwear foam uses ELVAX 9755 at 50–70 phr, low-density polyethylene or lower-VA EVA at 30–50 phr, azodicarbonamide blowing agent at 2–5 phr, dicumyl peroxide crosslinking agent at 0.5–1.0 phr, zinc oxide at 1–2 phr, and stearic acid at 0.5–1.0 phr. Compliance for density and compression set is tested according to ISO 845 and ASTM D395-18, with restricted substances controlled under REACH EC 1907/2006 and residual blowing agent limits under EU 10/2011 where consumer contact is intended. Production on compounding lines uses an internal mixer preheated to 105–120°C to prevent premature peroxide decomposition, followed by a two-roll mill and compression molding at 150–170°C under 8–15 min cycle time. The critical processing boundary is scorch: mixing above 120°C initiates dicumyl peroxide decomposition and produces localized gel particles that become surface defects in molded soles. Cell-size control depends on balancing decomposition kinetics of azodicarbonamide and peroxide cure; published data for this specific configuration is limited in non-standard density ranges below 0.15 g/cm³. Terminal product types include athletic shoe midsoles, sandal and flip-flop soles, anti-fatigue mats, and gymnasium flooring tiles.
Melt filtration pressure on a masterbatch line is not an artifact of screen condition alone; it responds to the way ELVAX 9755 wets organic pigments and carbon black. In the masterbatch itself, ELVAX 9755 is formulated at 40–60 wt% as the carrier resin, pigment at 20–40 wt%, wax dispersant at 5–15 wt%, and antioxidant at 0.2–0.5 wt%; at injection molding or film extrusion, the final letdown ratio is typically 2–4 wt%. End-use compliance is not a single masterbatch standard: food-contact packaging grades must comply with FDA 21 CFR §177.1340 and EU 10/2011, toy applications must satisfy EN 71-3 migration limits, and electrical enclosures may fall under IEC 60695-2-11 glow-wire ignition temperature. Production uses a co-rotating twin-screw extruder with L/D 36–44, pigment side-feeding at 120–160°C, and melt filtration through 50–150 µm screens; screen pressure rise above 1.0 MPa per 8-hour production run indicates pigment agglomeration or insufficient dispersant. Moisture above 0.02 wt% must be avoided because hydrolysis at processing temperatures lowers melt viscosity and causes strand breakage. Terminal product types include black and color masterbatches for EVA and polyethylene film, injection molded footwear components, extruded profiles, and cable jacket tinting compounds.
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ELVAX 9755 Ethylene Vinyl Acetate Copolymer is a high-flow, 28 wt% vinyl acetate copolymer supplied in pellet form for hot-melt adhesives, polymer modification, and wax blends. The nominal melt flow rate is 55 g/10 min determined at 190 °C under 2.16 kg load per ASTM D1238 or ISO 1133-1:2022. The resin is produced by high-pressure free-radical copolymerization; the 28 wt% comonomer content reduces crystallinity relative to lower-vinyl-acetate EVA and places the peak melting temperature near 73 °C when measured by differential scanning calorimetry per ASTM D3418. Density is typically 0.95 g/cm³ per ASTM D792. Representative values are not specification limits and should be confirmed against the certificate of analysis.
The primary distinction is melt flow rate. ELVAX 240 carries the same nominal 28 wt% vinyl acetate content but a melt flow rate of 43 g/10 min, and ELVAX 250 carries 25 g/10 min. Raising the melt flow rate to 55 g/10 min does not alter comonomer content but reduces melt viscosity under equivalent shear. In hot-melt adhesive compounding, this permits application temperature reductions of 10–15 °C on slot-die coating lines when compared with ELVAX 250, provided tackifier and wax ratios are held constant. The lower viscosity improves penetration into coated board, nonwoven, and lightly sized paper; it also shortens open time. Tensile shear adhesion on aluminum per ASTM D1002 is typically lower for the 55 g/10 min grade than for the 25 g/10 min grade at identical adhesive film thickness because molecular weight and cohesive strength decrease with increasing melt flow rate.
Because vinyl acetate content remains 28 wt%, the low-temperature flexibility, polar substrate adhesion, and solubility in aromatic and chlorinated solvents are broadly retained relative to lower-flow 28% grades. Melt processing should remain below 230 °C. At barrel setpoints above 200 °C, residence time should be kept under 10 min to limit deacetylation and acetic acid evolution. Corrosion-resistant tooling and venting to a scrubbed exhaust are required when the resin is held above 180 °C for extended periods.
When ELVAX 9755 is used in hot-melt adhesive compounding at 20–35 wt% resin, the higher melt flow rate shifts the viscosity-temperature curve downward. In a 40:1 L/D co-rotating twin-screw extruder with barrel setpoints of 90 °C in the feed zone, 110 °C in the mixing zones, and 120 °C at the die, the compound can be pelletized without steam quenching; a lower-flow 25 g/10 min grade often requires die temperatures 10–15 °C higher to avoid pellet tails and melt fracture. Capillary rheometry at 190 °C and apparent shear rates from 100 s⁻¹ to 500 s⁻¹ shows shear thinning, which supports slot-die coating at line speeds from 50 m/min to 150 m/min without skipping. Adhesive formulations should not exceed 45 wt% ELVAX 9755 because phase inversion with high-flow wax can lead to surface bloom and loss of T-peel strength per ASTM D1876.
| Property | Test method | Representative value |
|---|---|---|
| Melt flow rate | ASTM D1238 / ISO 1133-1:2022 at 190 °C, 2.16 kg | 55 g/10 min |
| Vinyl acetate content | ASTM D5594 | 28 wt% |
| Density | ASTM D792 / ISO 1183-1:2019 | 0.95 g/cm³ |
| Peak melting temperature | ASTM D3418 / ISO 11357-3 | 73 °C |
| Vicat softening temperature | ASTM D1525 / ISO 306, 10 N | 44 °C |
| Shore A hardness | ASTM D2240 / ISO 868, 15 s | 68–72 |
| Tensile strength at break | ASTM D638 / ISO 527-2, 500 mm/min | 4–5 MPa |
| Elongation at break | ASTM D638 / ISO 527-2, 500 mm/min | 800–1000% |
These values are representative of production lots and should not be interpreted as specification limits. Lot-to-lot melt flow rate variation is generally controlled within ±10% of nominal; exact values for vinyl acetate content, density, and melt flow rate should be obtained from the certificate of analysis. Vicat softening temperature is sensitive to thermal history and specimen thickness; values obtained on 3 mm compression-molded plaques per ISO 306 may differ from extruded film values.
Compared with ELVAX 150, which has 32 wt% vinyl acetate and a melt flow rate of 43 g/10 min, ELVAX 9755 provides a less polar chain and a higher melt flow. The practical consequence is reduced adhesion to bare aluminum and polar engineering thermoplastics, but improved compatibility with paraffin wax and aliphatic tackifiers. Compared with ELVAX 450, an 18 wt% vinyl acetate grade with a melt flow rate of 8 g/10 min, ELVAX 9755 has a lower peak melting point, lower Shore A hardness, and higher extensibility at low temperatures. Table 2 lists selected grade differences.
| Grade | Nominal vinyl acetate content | Melt flow rate at 190 °C/2.16 kg | Relative melt viscosity under equivalent shear |
|---|---|---|---|
| ELVAX 9755 | 28 wt% | 55 g/10 min | Low |
| ELVAX 240 | 28 wt% | 43 g/10 min | Medium |
| ELVAX 150 | 32 wt% | 43 g/10 min | Medium |
| ELVAX 450 | 18 wt% | 8 g/10 min | High |
The 28 wt% vinyl acetate content depresses crystalline melting and broadens the seal initiation window. In blown film, the grade can be let down into LDPE at 10–30 wt% to lower seal initiation temperature from approximately 105 °C to 75–85 °C, depending on layer gauge and seal dwell. Hot-tack strength measured per ASTM F1921 increases in the 70–90 °C range, but ultimate interlayer adhesion is controlled by the LDPE matrix and extrusion temperature profile. Because the melt flow rate is 55 g/10 min, film processors should monitor film gauge uniformity; high-flow resin in the skin layer may cause port-line streaks if die-lip temperatures are not balanced within ±2 °C. Published data for this specific packaging configuration is limited; sealing curves should be generated on the target line.
Regulatory status for food-contact packaging must be verified before conversion. EVA copolymers are commonly referenced under FDA 21 CFR 177.1350 and EU Regulation (EU) No 10/2011, but compliance depends on the full formulation, migration testing under intended food simulants, and lot-specific certificates. REACH and RoHS declarations should be requested from the resin supplier. Direct food-contact status should not be assumed for compounds containing tackifier, wax, or processing aids.
Compatibility is governed by the solubility parameter of the 28 wt% vinyl acetate phase and the aliphatic ethylene phase. Fully hydrogenated rosin esters and C5/C9 aliphatic-aromatic resins are commonly used at 30–50 wt%. Incompatible systems phase-separate during cooling and produce haze or loss of peel strength per ASTM D1876. A practical screening method is to cast a 0.5 mm film and inspect for opacity after 24 h at 25 °C; a haze value greater than 20% per ASTM D1003 indicates limited compatibility. The higher melt flow rate of ELVAX 9755 permits the use of lower-viscosity tackifiers without sacrificing slot-die coatability.
In hot-melt packaging, failure under chilled conditions typically shifts from substrate fiber tear to adhesive cohesive failure as EVA molecular weight decreases. When ELVAX 9755 replaces a 25 g/10 min grade, the adhesive may exhibit a 10–20% reduction in low-temperature T-peel strength on high-density polyethylene per ASTM D1876. This reduction should be compensated with polar tackifier addition or by reducing wax content. The stabilizer package in the base resin retards chain scission during melt processing, but long-run hot-melt operations frequently add a secondary antioxidant at 0.1–0.3 wt% when pot life exceeds 8 h at 160–180 °C.
When melt temperatures exceed 200 °C in high-shear conversion, acetic acid elimination accelerates. The critical threshold for continuous operation is typically 230 °C; above this temperature, bubble formation and screw corrosion occur within minutes. A 25:1 L/D single-screw extruder with a barrier screw and a melt temperature of 160–180 °C is preferred for profile extrusion. At moisture levels above 0.1 wt%, pre-drying for 2–4 h at 60 °C in a desiccant dryer reduces surface defects. Avoid combining ELVAX 9755 with strong acids or oxidizing agents; halogenated flame retardants that release acids at processing temperatures are not recommended. Acetic acid by-products require venting to a scrubbed exhaust system.
