| HS Code | 265093 |
| Vinyl Acetate Content | 9.5 wt% |
| Melt Flow Index | 8 g/10 min at 190°C/2.16 kg |
| Density | 0.930 g/cm³ |
| Melting Point | 99°C |
| Tensile Strength At Break | 14 MPa |
| Elongation At Break | 750% |
| Flexural Modulus | 35 MPa |
| Shore D Hardness | 43 |
| Vicat Softening Point | 67°C |
| Brittleness Temperature | -100°C |
| Freezing Point | 88°C |
As an accredited ELVAX 9770 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX 9770 EVA copolymer supplied as free-flowing pellets in 25 kg multi-wall paper bags, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL: palletized ELVAX 9770 resin bags loaded neatly, secured, ventilated, dry, protected from moisture and contamination. |
| Shipping | ELVAX 9770 (Ethylene Vinyl Acetate Copolymer) ships as solid pellets in sealed bags, gaylords, or bulk containers. It is non-hazardous under normal transport conditions. Keep dry, away from extreme heat, ignition sources, and direct sunlight. Avoid compaction or sharp impacts to preserve pellet quality and prevent bag damage. |
| Storage | Store ELVAX 9770 in its original, tightly sealed container in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Avoid exposure to excessive humidity and temperatures above recommended limits to prevent caking or degradation. Keep out of reach of unauthorized personnel and protect from physical damage. |
| Shelf Life | Shelf life is at least one year when stored in a cool, dry place, away from direct sunlight and moisture. |
Compounds based on ELVAX 9770 are processed through two-stage mixing to prevent scorch before the final expansion step. The resin is supplied with a nominal vinyl acetate content of 24–25 wt% and a melt mass-flow rate of approximately 2.0 g/10 min at 190 °C/2.16 kg per ISO 1133-1. A production-scale two-roll mill with friction ratio 1:1.2 and roll temperature 100–110 °C is used to flux the resin, followed by addition of zinc oxide 1.5–2.5 phr, zinc stearate 0.5–1.0 phr, and calcium carbonate 5–15 phr. Azodicarbonamide at 4–8 phr and dicumyl peroxide at 0.6–1.2 phr are introduced as pre-dispersed masterbatch below 110 °C to avoid premature decomposition. The prepared compound is sheeted to 3–5 mm thickness and transferred to a hydraulic compression press with platens controlled at 150–165 °C and dwell time 8–12 min. Mold pressure is held at 10–15 MPa until the peroxide decomposition exotherm is complete. Gel content is measured by solvent extraction in boiling xylene for 24 h according to ASTM D2765; production stock typically falls within 60–75%. Foam density is determined by ASTM D3575, with footwear midsoles commonly targeted at 0.12–0.20 g/cm³. The operational window is narrow because residual amine-based stabilizers can lower the onset of azodicarbonamide decomposition below 110 °C; therefore formulations containing amine antidegradants require additional cooling and batch-age monitoring. Terminal products include single-density and dual-density footwear midsoles, EVA foam rolls for yoga mats, protective padding, and marine flotation blocks.
In low-smoke, halogen-free insulation compounds for building and railway cables, ELVAX 9770 functions as the polar matrix into which alumina trihydrate and magnesium dihydrate are dispersed. The vinyl acetate content increases dipole interaction with metal hydroxide surfaces, permitting filler loadings of 150–180 phr without complete loss of elongation. Compounding on a Buss MDK/E 70 kneader with screw temperature 90–110 °C and discharge die 120–140 °C produces pellets suitable for continuous vulcanization lines. Barrel temperatures are set in increasing profile from 110 °C to 125 °C before the head, and the melt is extruded onto copper or aluminum conductor. Peroxide levels of 1.0–2.0 phr are used with steam curing at 1.5 MPa and 180–190 °C. The cured insulation is evaluated by IEC 60754-1 for acid gas evolution, IEC 60754-2 for pH and conductivity, IEC 61034 for smoke density, and ISO 4589 for oxygen index above 30%. Tensile elongation after ageing for 7 days at 100 °C is required to exceed 150% under IEC 60811-501. The critical formulation conflict is between flame retardancy and mechanical toughness: increasing ATH above 180 phr raises oxygen index but can reduce elongation below 150% and sharply increase screw torque. Vinyl silane at 1.0–2.0 phr is applied as coupling agent, but storage humidity above 60% RH initiates hydrolysis and causes viscosity drift. Pre-drying at 70–80 °C for 2–4 h is required if surface moisture exceeds 0.1%. Terminal products include LSZH building riser cables, railway control cables, and photovoltaic array cable sheathing.
| Downstream segment | Reference method | Production checkpoint |
|---|---|---|
| Crosslinked EVA foam | ASTM D3575, ASTM D2765 | Density 0.12–0.20 g/cm³; gel content 60–75% |
| LSZH cable insulation | IEC 60754-1, IEC 60754-2, IEC 61034, ISO 4589 | pH > 4.3; conductivity < 10 µS/mm; oxygen index > 30% |
| Extrusion lamination | FDA 21 CFR 177.1350, EU 10/2011, ASTM F88 | Overall migration < 10 mg/dm²; seal strength > 2.5 N/15 mm |
| Masterbatch carrier | ISO 1133-1, ISO 3451-1, IEC 62321 | MFR 2.0 g/10 min; ash by target; heavy metals per RoHS |
| Automotive interior sheet | VDA 277, ISO 62, ISO 7619-1 | Total carbon emission < 50 µg C/g; water absorption < 1%; Shore A 75–85 |
| Bitumen modification | EN 1427, ASTM D4402, EN 1109 | Softening point rise 20–35 °C; viscosity < 2000 mPa·s at 180 °C; no cracking at -20 °C |
Extrusion coating of ELVAX 9770 onto aluminum foil, corona-treated PET, or paperboard is performed at die temperatures of 230–260 °C. The melt flow rate near 2.0 g/10 min requires a flat die with internal deckles and a die gap of 0.6–0.8 mm; the air gap between die exit and chill roll is set at 150–200 mm to allow surface oxidation and increase bond strength. Coating weight is controlled between 15 g/m² and 30 g/m², corresponding to 15–30 µm thickness. The chill roll is maintained at 15–20 °C, and the laminate is wound at 50–80 m/min. Seal strength is evaluated after 24 h conditioning at 23 °C and 50% RH using ASTM F88 with 15 mm strip width; aseptic carton structures typically require heat seal strength above 2.5 N/15 mm at jaw temperature 160–180 °C and dwell time 0.2–0.3 s. The EVA sealant layer also contributes interfacial adhesion to aluminum foil; peel testing per ASTM D1876 after conditioning often shows cohesive failure within the EVA layer rather than adhesive delamination when the foil surface is free of rolling oil. Food contact status is governed by FDA 21 CFR 177.1350 and EU 10/2011; overall migration into food simulants for the finished multilayer structure must remain below 10 mg/dm². Because ELVAX 9770 has lower melt flow than conventional extrusion coating grades, draw resonance may occur above 150 m/min; line speed is balanced against neck-in performance and coating weight uniformity. Terminal products include aseptic brick packs, toothpaste and pharmaceutical laminate tubes, and flexible sachets for liquid dairy products. Published data for this specific line configuration is limited, so production settings are confirmed through trial coating runs.
In masterbatch production, ELVAX 9770 is used as a carrier resin for mineral flame-retardant concentrates and polar color concentrates. The resin is dry-blended with 50–70 wt% alumina trihydrate or magnesium hydroxide, 0.5–1.0 wt% processing stabilizer, and optional coupling agent. Mixing is performed in a co-rotating twin-screw extruder with 44:1 L/D and side-feeding of filler after the resin melting zone to limit screw torque. Barrel temperatures from feed to die are 90/120/130/140/130 °C, and the melt is pelletized by an underwater die-face cutter. The resulting masterbatch is let down at 20–30 wt% into LLDPE, EVA, or EPDM cable compounds. The relatively low melt index of ELVAX 9770 reduces binder migration during storage and preserves pellet hardness; the vinyl acetate groups reduce interfacial tension between the polyolefin phase and mineral filler surfaces. Quality control includes ash content by ISO 3451-1, melt flow rate by ISO 1133-1, and volatiles by Karl Fischer titration. Compliance with REACH and RoHS 2011/65/EU is verified by XRF screening per IEC 62321. Terminal products are dust-free flame-retardant concentrates and color masterbatches used in cable, footwear, and construction film plants. When filler loading exceeds 70 wt%, extrusion current rises and melt pressure at the screen changer may exceed 15 MPa; published data for this specific configuration is limited, so line trials are required before full-scale adoption.
When thermoformable automotive interior sheet is required, ELVAX 9770 is blended with linear low-density polyethylene or polyolefin elastomer to maintain low-temperature ductility. A typical sheet formulation contains ELVAX 9770 60–80 phr, polyolefin elastomer 20–40 phr, calcium carbonate 20–40 phr, antioxidant 0.1–0.3 phr, and processing aid 0.5–1.0 phr. The compound is fluxed in an internal mixer at 120–140 °C and discharged at 125–135 °C, then fed to a three-roll calender with roll temperatures 95/105/110 °C to produce 1.5–3.0 mm sheet. Embossing is applied inline at the third roll. Shore A hardness is measured by ISO 7619-1 and is typically 75–85 in the finished sheet. Water absorption after 24 h immersion is tested by ISO 62 and is held below 1% for interior trim applications. Volatile organic compound emission is tested by VDA 277; many OEM specifications require total carbon emission below 50 µg C/g. Increasing calcium carbonate above 45 phr reduces gloss and cost, but tensile strength declines to levels unsuitable for load-bearing components. The sheet is thermoformed at surface temperatures of 110–130 °C, with mold vacuum and plug assist adjusted to wall thickness variation below 15%. Terminal products include door panel inserts, console mats, trunk liners, and scuff plates. Published data for this specific configuration is limited, and part approvals require validation against vehicle OEM performance specifications.
For polymer-modified bitumen waterproofing membranes, ELVAX 9770 is added to hot oxidized bitumen at 170–190 °C in a high-shear rotor-stator mixer. The EVA content is 3–6 wt% relative to bitumen; below 3 wt% the softening point increase is insufficient, and above 6 wt% the melt viscosity at 180 °C may exceed 2000 mPa·s, causing pumping and coating difficulties. Softening point before and after modification is measured by ring-and-ball method per EN 1427; a shift of 20–35 °C is typical for EVA-modified bitumen at 5 wt% loading. Brookfield viscosity at 180 °C is tested per ASTM D4402 or EN 13302. The modified bitumen is coated onto polyester or fiberglass reinforcement at 160–180 °C and then surfaced with mineral granules or sand. Low-temperature flexibility of the finished membrane is assessed by bending around a mandrel at -15 °C to -25 °C according to EN 1109; cracking indicates insufficient EVA dispersion or excessive filler addition. Terminal products include torch-applied and self-adhesive waterproofing membranes, bridge deck membranes, and roofing underlayments. Compliance is referenced to EN 13707 for roofing sheets, and production batches are released only after softening point, viscosity, and cold bend results fall within the declared specification band.
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ELVAX 9770 is a high-pressure free-radical copolymer of ethylene and vinyl acetate, supplied as translucent pellets. The grade identifier denotes a product within the manufacturer’s ELVAX line; the numerical designation does not provide a direct reading of comonomer content or melt flow rate. Current supplier technical documentation lists a nominal vinyl acetate content of 25 wt% and a melt flow rate of 4 g/10 min measured at 190 °C under a 2.16 kg dead load in accordance with ISO 1133-1:2022. Typical density is 0.95 g/cm³ at 23 °C per ISO 1183-1:2019. Differential scanning calorimetry according to ASTM D3418-21 records a broad melting endotherm between 72 °C and 78 °C, consistent with disruption of polyethylene crystallinity by the acetate side groups. Tensile testing of 2 mm compression-moulded plaques per ASTM D638-14 typically indicates tensile strength at break of 15–20 MPa and elongation at break above 700%. These values are typical lot averages, not release limits; the lot-specific certificate of analysis is the controlling specification.
The 25 wt% vinyl acetate in ELVAX 9770 introduces polar ester side groups that reduce crystallinity and increase specific adhesion to aluminium, polyester, and cellulose. Compared with low-density polyethylene, the comonomer lowers the peak melting endotherm from roughly 110 °C to below 80 °C, broadens the melting range, and shifts the low-temperature transition measured by ISO 6721-1:2019 to between -30 °C and -20 °C. In adhesion testing according to ASTM D1876, EVA resins in this vinyl acetate range typically produce higher flexible-packaging peel strengths than 12 wt% vinyl acetate grades such as ELVAX 660, because the polar acetate groups interact with surface oxides and hydroxyl groups on metal foils and corona-treated films. The same polarity reduces the methylene sequence length and lowers flexural modulus; comparative ISO 178:2019 three-point flexure data should be evaluated on conditioned specimens because EVA modulus is humidity-dependent through plasticisation of the amorphous phase. Relative to 40 wt% vinyl acetate resins such as ELVAX 40W, ELVAX 9770 exhibits higher tensile strength and heat resistance but lower tack and slower substrate wet-out on high-surface-energy substrates; surface energy of corona-treated film should be checked by ASTM D2578 and maintained above 38 mN/m for lamination.
Capillary rheometry according to ISO 11443:2021 at 190 °C characterises ELVAX 9770 as a pseudoplastic melt; apparent shear viscosity declines as shear rate increases from 100 s⁻¹ to 1,000 s⁻¹, although exact curves are lot-dependent. On single-screw extrusion lines with 24:1 to 30:1 L/D and corrosion-resistant screw and barrel metallurgy, barrel set points from 150 °C to 230 °C are typical. The feed throat must be water-cooled because pellet softening occurs above approximately 50 °C, and pellet bridging in the throat is a known production bottleneck. Screw designs with compression ratios of 2.5:1 to 3.5:1 and without severe Maddock mixing elements are used to limit shear heating. Extrusion coating lines with a 90 mm single-screw extruder and flat die generally operate at melt temperatures from 220 °C to 240 °C; the higher temperature improves draw-down but residence time above 230 °C should stay below 20 min to reduce deacetylation. Desiccant drying at 60 °C for 4 h is recommended when pellet surface moisture exceeds 0.05 wt%, particularly at ambient relative humidity above 60%; published supplier moisture-threshold data for ELVAX 9770 is limited and should be confirmed with a Karl Fischer moisture analyser calibrated to ISO 15512:2019.
EVA copolymers with 25 wt% vinyl acetate are swollen by aromatic hydrocarbons, chlorinated solvents, ketones, and esters; solubility parameter approximations place the resin in the 8.5–9.0 (cal/cm³)0.5 region, but published data for ELVAX 9770 is limited. Exposure to methyl ethyl ketone, ethyl acetate, or toluene in printing and laminating lines therefore requires dry-bond or wiped lamination cell design with controlled extraction ventilation. The resin maintains acceptable service resistance in contact with dilute acids, alkalis, and alcohols at ambient temperature, although environmental stress-cracking performance should be evaluated under ASTM D1693 for aggressive service environments. Because the vinyl acetate comonomer increases oxygen and moisture permeability relative to LDPE, barrier specifications in packaging must be confirmed by oxygen transmission rate under ASTM D3985 and water vapour transmission rate under ASTM F1249 on the finished laminate, not on the resin alone.
Thermogravimetric analysis under ISO 11358-1:2022 in nitrogen typically positions the onset of mass loss above 280 °C for EVA grades with 25 wt% vinyl acetate; the exact value varies with heating rate, sample mass, and purge-gas flow. Thermal deacetylation of the acetate side group begins at lower temperatures and becomes process-relevant above 230 °C, releasing acetic acid. Continuous production lines therefore specify nitrided steel, bimetallic barrel liners, or corrosion-resistant alloys for adapters, melt pipes, and dies. Batch-to-batch variance in surface moisture and residual stabiliser concentration can shift the observable degradation onset; stabiliser consumption should be monitored by melt flow retention after multiple extrusion passes. Primary amine-based stabilizers are generally avoided in EVA formulations because reaction with acetic acid degradation products can reduce their long-term thermal stabilising efficiency. Acid scavengers such as zinc stearate or calcium stearate at 0.5–1.5 wt% are incorporated in hot-melt adhesive compounds to buffer residual acidity. In peroxide-crosslinked systems, compounding must remain below the dicumyl peroxide decomposition threshold of approximately 120 °C to prevent scorching; cure behaviour should be characterised by a moving-die rheometer according to ASTM D6601-21.
In hot-melt adhesive compounding, ELVAX 9770 is melt-blended with hydrocarbon tackifiers and paraffin or microcrystalline waxes in heated sigma-blade mixers or twin-screw kneaders at 170–190 °C. Brookfield viscosity is measured according to ASTM D3236-15 at 180 °C; a ternary formulation containing 30 wt% ELVAX 9770, 35 wt% tackifier, and 35 wt% paraffin wax may produce viscosities in the 1,500–2,500 mPa·s range, though supplier-published data for this specific ternary formulation is limited. Open time and set time depend on wax crystallisation and thermal diffusivity of the substrate; comparative measurements should be carried out with the same coat weight and substrate temperature. In extrusion coating and lamination of aluminium foil and polyester film, ELVAX 9770 is applied at coat weights from 12 g/m² to 25 g/m², and bond strength is tested by ASTM D1876 after conditioning at 23 °C and 50% relative humidity for 24 h.
In polymer modification and masterbatch carrier applications, the polar acetate groups improve wetting of mineral fillers and organic pigments; dispersion quality can be assessed as filter pressure rise on a 40:1 L/D twin-screw extruder fitted with a screen pack, but published data for ELVAX 9770 in masterbatch carrier service is limited. The grade is also used in wax modification, where its addition raises melt viscosity and low-temperature flexibility of paraffin systems. Food-contact compliance is not intrinsic to the resin; finished articles must be evaluated under 21 CFR 177.1350 or EU Regulation 10/2011 for migration limits appropriate to the intended food type and use temperature. Electrical and electronic applications require supplier declarations for RoHS Directive 2011/65/EU and REACH SVHC obligations, preferably assessed against IEC 63000; these declarations are supplier- and lot-specific and should be verified against current documentation.
Unlike ethylene methyl acrylate copolymers, ELVAX 9770 has higher hydrocarbon character and a stiffer backbone at equivalent comonomer content; unlike metallocene polyolefin plastomers, it provides greater polarity for adhesion to polar substrates but lower thermal oxidative stability. These differences affect stabiliser selection and maximum continuous service temperature; oxidative stability should be assessed by ISO 11357-6:2018 or ASTM D3895-19 using the specific stabiliser package, not the base resin.
The following comparative data place ELVAX 9770 between lower-vinyl-acetate and higher-vinyl-acetate resins in the same manufacturer line. The entries are nominal typical values, not release limits.
| Grade | Nominal vinyl acetate content | Nominal melt flow rate | Comparative position |
|---|---|---|---|
| ELVAX 660 | 12 wt% | 2.5 g/10 min | Higher stiffness, lower adhesion to polar substrates, higher melt processing temperature |
| ELVAX 9770 | 25 wt% | 4 g/10 min | Intermediate polarity; improved low-temperature flexibility over 12 wt% grade |
| ELVAX 40W | 40 wt% | 57 g/10 min | High tack, high surface wet-out, lower tensile strength and heat resistance |
Relative to ELVAX 660, ELVAX 9770 reduces melt processing temperature and improves adhesion to aluminium and corona-treated polyester, but lowers tensile strength and creep resistance. Relative to ELVAX 40W, ELVAX 9770 offers higher cohesive strength and better heat resistance, but lower initial tack and slower wet-out on high-surface-energy substrates. The melt flow rate of 4 g/10 min is higher than that of low-MFR 25 wt% grades such as ELVAX 360, which increases substrate penetration and may improve wetting in porous board at the cost of reduced melt strength. In extrusion coating, ELVAX 9770 exhibits greater neck-in than low-MFR grades; the difference is managed by reducing the air gap, increasing draw ratio, or adjusting die lip geometry, with coating-width stability measured optically at the chill roll.
