| HS Code | 362899 |
| Vinyl Acetate Content | 12 wt% |
| Melt Flow Index 190c 2 16kg | 2.0 g/10 min |
| Density | 0.933 g/cm3 |
| Melting Point Dsc | 95 °C |
| Freezing Point Dsc | 78 °C |
| Vicat Softening Point | 80 °C |
| Shore D Hardness | 45 |
| Tensile Strength At Break | 20 MPa |
| Elongation At Break | 650% |
| Flexural Modulus | 120 MPa |
| Brittleness Temperature | -70 °C |
| Glass Transition Temperature | -35 °C |
As an accredited ELVAX 660 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX 660 ethylene vinyl acetate copolymer is supplied as solid pellets in 25 kg polyethylene-lined paper bags. |
| Container Loading (20′ FCL) | Load 20′ FCL with palletized ELVAX 660 bags, distribute weight evenly, secure properly, ventilate, and protect from moisture/heat. |
| Shipping | ELVAX 660 is shipped as solid pellets in moisture-resistant bags, drums, or bulk containers. Keep dry and away from excessive heat. No dangerous goods classification applies under standard transport regulations. Ensure clean, ventilated conditions to minimize dust accumulation, and store in a cool, dry warehouse. |
| Storage | Store ELVAX 660 in a cool, dry, well-ventilated area away from heat, sparks, open flames, and direct sunlight. Keep containers tightly closed to prevent contamination and moisture pickup. Avoid dust accumulation and contact with strong oxidizers. Ensure proper grounding for transfer operations. Maintain temperatures below 30°C (86°F) to preserve material quality. |
| Shelf Life | Shelf life is typically 2 years from shipment if stored in original, unopened packaging in a cool, dry area away from direct sunlight. |
ELVAX 660 is an ethylene-vinyl acetate copolymer with a nominal vinyl acetate content of 25 wt% and a producer-published melt flow rate of 2600 g/10 min under ASTM D1238 at 190 °C and 2.16 kg. The following application scope is limited to established downstream conversion routes in which resin loading, process equipment, and compliance requirements are publicly documented. Each production application requires site-specific validation because tackifier, wax, pigment, solvent, and co-binder interactions shift final bond strength, thermal resistance, viscosity response, and migration behaviour.
In packaging adhesive compounding, ELVAX 660 functions as the primary polymer backbone at 25–35 wt% of total compound mass, balanced against hydrogenated C5 or C9 tackifier resin, Fischer-Tropsch or low-oil paraffin wax, and 0.2–0.5 wt% hindered phenolic antioxidant. The practical formulation ceiling above 35 wt% is a viscosity boundary rather than a compatibility boundary: Brookfield viscosity at 180 °C under ASTM D3236 commonly exceeds 2,500 mPa·s when tackifier softening point is below 95 °C, reducing volumetric efficiency of gear pumps and increasing shear heating in the die-lip region. The high melt flow rate of ELVAX 660 permits tackifier wetting at barrel temperatures from 120 °C to 155 °C, but the melt must not remain above 200 °C for more than 30 minutes because localized deacetylation generates acetic acid and crosslinked gel particles. Production-scale equipment includes jacketed sigma-blade batch mixers with batch capacities of 500–2,000 kg or co-rotating twin-screw extruders with L/D 40:1, melt filtration through 150–250 µm screen packs, and slot-die coating at 170–180 °C onto kraft, oriented polypropylene, or polyester film at line speeds up to 300 m/min. For food-contact packaging, the formulated adhesive must comply with FDA 21 CFR 175.105 for adhesives and EU Regulation (EU) No 10/2011 with vinyl acetate-specific migration not exceeding 12 mg/kg simulant. Peel performance is evaluated by ASTM D1876 T-peel at 300 mm/min; fibre tear on recycled corrugate is the standard acceptance criterion. Moisture above 0.05% in incoming resin produces foaming in the melt pump and requires desiccant drying at 60 °C for 4 h before compounding. Terminal product types include frozen-food carton sealing, bookbinding perfect binding, label facestock adhesion, multi-wall bag bottom patches, and film-to-film laminations for confectionery wrap.
| Regulatory reference | Scope | Limit or method | Verification boundary |
|---|---|---|---|
| FDA 21 CFR 175.105 | Adhesives used in food packaging | No specific vinyl acetate SML; suitable purity and good manufacturing practice apply | Hot-melt seals on cartons, labels, and laminates; functional-barrier absence requires migration assessment |
| EU Regulation (EU) No 10/2011 | Plastic materials intended for food contact | Vinyl acetate SML 12 mg/kg; overall migration limit 10 mg/dm² or 60 mg/kg for low surface area | Fatty food simulant migration testing for high-VA EVA formulations |
| REACH Regulation (EC) No 1907/2006 | Registration and authorization of chemical substances | Tonnage-based registration; no SVHC candidate listing for ethylene-vinyl acetate copolymer | Raw material supply-chain documentation and incoming lot identity |
Paraffin wax modification with ELVAX 660 is directed at reducing brittleness, increasing flexural crack resistance, and retaining surface gloss in industrial wax compounds. Addition levels are typically 5–20 phr relative to paraffin or blended hydrocarbon wax; above 20 phr, Brookfield viscosity at 135 °C under ASTM D3236 may exceed 300 mPa·s, which becomes a limiting factor for curtain-coating pumps and dip-carousel withdrawal lines. The resin is incorporated into molten wax at 120–145 °C in a jacketed high-shear mixer fitted with a rotor-stator head; after 45–60 min of dispersion, the compound is filtered through 60 µm mesh and pastillated on a cooled steel belt. For food-contact wax coatings, the final compound must meet FDA 21 CFR 176.170 or 176.180 for components of paper and paperboard in contact with aqueous and fatty foods, with total extractives controlled under 21 CFR 176.170(a)(5). Industrial non-food compounds are evaluated for congealing point under ASTM D938 and melt viscosity under ASTM D3236. Finished product types include investment casting pattern wax blends, water-resistant corrugated board wax saturants, and industrial tile backer waterproofing coatings. Aromatic-poor paraffin with high iso-paraffin content can form a melt-phase haze at 5% EVA loading if the paraffin oil content exceeds 1.5 wt%, causing surface bloom after cooling.
In carbon black and organic pigment masterbatch production, ELVAX 660 serves as the carrier phase at 20–35 wt% of the total concentrate formula; pigment loading is held between 30–50 wt%, and a polar wax or fatty acid ester dispersant is added at 2–5 wt% to suppress reagglomeration during downstream letdown. Compounding is performed on a co-rotating twin-screw extruder with L/D 44:1 and screw diameter between 40 mm and 75 mm; distributive mixing elements occupy zones 5 through 7, while a vacuum port at −0.08 MPa removes residual moisture and low-boiling dispersant fractions. Barrel temperatures range from 120 °C at the feed throat to 150 °C at the die, and melt temperature should not exceed 160 °C to prevent thermal yellowing and pigment wettability loss. The extrudate is strand-pelletized through a water bath at 20–35 °C and dried to 0.03% moisture before packaging. For food-contact packaging applications, the masterbatch must comply with FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers and EU Regulation (EU) No 10/2011, including vinyl acetate-specific migration not exceeding 12 mg/kg simulant; the finished-film letdown ratio must be calculated so that final EVA content remains within the positive-list boundary. Terminal product types include pigmented LDPE and EVA extrusion-coating films, coloured shrink labels, and injection-moulded closures. In polypropylene, letdown above 2 wt% carrier may produce haze and delamination, so PP-specific carriers are required beyond that loading.
Aluminium foil lidding and polyester retort films utilise ELVAX 660 as the heat-sealable resin in solvent-based lacquers and extrusion-laminated sealant layers. The solvent lacquer is prepared at 15–25% solids in a toluene/MEK or ethyl acetate/MEK blend, with dissolution maintained at 60–70 °C in an explosion-proof jacketed vessel fitted with a reflux condenser; the lacquer is applied by gravure cylinder at 2–4 g/m² dry coat weight, dried through three oven zones at 80 °C, 100 °C, and 120 °C, and then sealed against PET, PVC, or polypropylene trays at 130–160 °C with dwell times of 0.5–1.0 s and pressure of 2–4 bar. The formulated coating falls under FDA 21 CFR 175.300 for resinous and polymeric coatings as a food-contact surface, and under EU Regulation (EU) No 10/2011 the vinyl acetate-specific migration limit of 12 mg/kg simulant applies. Seal strength is verified by ASTM F88 peel testing at 300 mm/min. Finished product types include dairy lidding film, ready-meal tray lidding, condiment portion packs, and pharmaceutical strip-pack lidding. Amine-based slip agents or curatives are excluded from the solvent lacquer because residual basic species accelerate vinyl acetate deacetylation under retort-equivalent conditions of 121 °C, reducing bond strength and generating acetic acid odour.
In solvent-borne lamination adhesives for flexible packaging, solids content below 15% correlates with dry film thickness insufficient to maintain peel strength above 2 N/15 mm on PET/aluminium foil laminates, especially after 24 h ageing at 40 °C; the production range is 15–18% solids with ELVAX 660 as the primary resin and a polyester or polyurethane co-binder at 10–20% of resin solids. The adhesive is applied by reverse-gravure coating at 1.5–2.5 g/m², oven-dried at 70–90 °C, and nipped at 80–120 °C under 1–2 bar. Food-contact use requires FDA 21 CFR 175.105 adhesive status and EU Regulation (EU) No 10/2011 vinyl acetate SML compliance; terminal materials include snack laminates, boil-in-bag packaging, and confectionery wrappers. Aromatic isocyanate crosslinkers must be predried and kept below 0.1% moisture to prevent carbon dioxide bubble formation in the gravure pan.
Polymer-modified bituminous waterproofing membrane compounds are produced with ELVAX 660 added at 3–6% by mass of penetration-grade bitumen in a vertical high-shear mixer at 180–200 °C; rotor speed of 3000 rpm is maintained for 1.5–2.5 h until the mixture is homogeneous under fluorescence microscopy at 400×. The modification increases low-temperature flexibility and reduces flow at elevated roof-surface temperatures when the compound is coated onto polyester or glass-fibre carriers. Compliance for torch-applied and self-adhesive membranes is assessed under EN 13707 for flexible sheets for waterproofing and ASTM D6084 for elastic recovery of bituminous materials; low-temperature flexibility is tested between −10 °C and −20 °C depending on climate classification. Terminal product types include reinforced roofing membranes, foundation waterproofing sheets, and self-adhesive cold-applied membranes. Published production data for this specific high-flow EVA grade in bituminous systems are limited compared with hot-melt grades, so mill trials must verify phase compatibility and storage stability before scale-up; prolonged mixing above 220 °C must be avoided because thermal oxidation and gel formation increase compound viscosity and reduce adhesion to reinforcement.
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ELVAX 660 Ethylene Vinyl Acetate Copolymer is a low-vinyl acetate EVA grade with a nominal vinyl acetate content of 12 wt% and a melt index of 2.5 dg/min when measured under ASTM D1238 at 190 °C with a 2.16 kg load. Density is reported at 0.933 g/cm³ under ASTM D792. The copolymer is profile-extruded, injection-molded, calendered, and compounded for flexible automotive interior parts, appliance bumpers, gaskets, tubing, footwear components, and as a polymeric binder in wax-based hot-melt systems. Its position between LDPE and higher-VA EVA grades produces a distinct balance of semicrystalline stiffness, low-temperature flexibility, stress-crack resistance, and moderate polarity.
The vinyl acetate monomer randomizes ethylene sequences and reduces crystalline order. At 12 wt% VA, total crystallinity remains sufficient to retain a peak melting endotherm near 95–98 °C under ASTM D3418, whereas a 25–28 wt% VA adhesive-grade EVA typically shows a melting range below 85 °C and much lower tensile modulus. The lower crystallinity of high-VA grades increases segmental mobility and tackifier compatibility but reduces creep resistance at elevated service temperature. In contrast, ELVAX 660 retains a Vicat softening point high enough for semi-structural profiles, while the VA comonomer provides improved environmental stress crack resistance compared with LDPE homopolymer grades. The difference is also rheological: ELVAX 660 has higher melt viscosity than high-VA grades with comparable melt index because the lower comonomer content preserves longer ethylene sequence lengths and higher chain entanglement density.
| Parameter | LDPE | ELVAX 660 | High-VA EVA |
|---|---|---|---|
| Vinyl acetate content | 0 wt% | 12 wt% | 25–28 wt% |
| Melt index, 190 °C/2.16 kg | 1–2 dg/min | 2.5 dg/min | 2–400 dg/min |
| Density, ASTM D792 | 0.918–0.922 g/cm³ | 0.933 g/cm³ | 0.948–0.951 g/cm³ |
| Peak melting point, ASTM D3418 | 105–115 °C | 95–98 °C | 70–85 °C |
| Relative polarity and tackifier compatibility | low | moderate | high |
These differences translate directly into equipment behavior. In a single-screw extruder with a 24:1 L/D barrier screw, ELVAX 660 reaches stable melt pressure at 170–200 °C with specific output in the range 0.8–1.4 kg/h/rpm depending on screw design; published data for this specific configuration is limited. If the same screw is used with high-VA EVA, melt temperature must be reduced by 10–20 °C to prevent viscosity drop and surging. Compared with LDPE, ELVAX 660 requires a slightly lower die temperature and has a narrower melt fracture threshold at high shear rates.
Profile extrusion of ELVAX 660 on a 40:1 L/D single-screw line typically starts with a barrel profile of 150–170 °C in the feed throat zone, 175–190 °C in the compression zone, 190–205 °C in the metering zone, and 195–210 °C at the die. A screen pack of 60/100/60 mesh is used to increase back pressure and eliminate gels. Melt temperature measured with an immersion thermocouple should remain below 220 °C. Pellets stored below dew point should be dried at 60–70 °C for 2 h to remove surface condensation before processing; EVA hydrolysis is not a principal risk, but moisture splay and melt-pressure fluctuations are observed at relative humidity above 60 %. Injection molding conditions for thick-wall seals include a rear zone of 160–180 °C, middle zone 180–195 °C, front zone 190–205 °C, and nozzle 195–205 °C, with mold temperature controlled at 20–40 °C to balance cycle time and surface replication. Clamp force requirements are lower than for HDPE of equivalent melt index because of reduced injection pressure.
| Operation | Parameter | Recommended range or condition |
|---|---|---|
| Extrusion | Barrel feed / compression / metering / die | 150–170 / 175–190 / 190–205 / 195–210 °C |
| Extrusion | Melt temperature limit | 220 °C maximum |
| Injection molding | Rear / middle / front / nozzle | 160–180 / 180–195 / 190–205 / 195–205 °C |
| Injection molding | Mold temperature | 20–40 °C |
| Drying | Hot-air drying at ambient RH > 60 % | 60–70 °C for 2 h |
| Twin-screw compounding | L/D ratio | 40:1 |
| Twin-screw compounding | Screw speed | 200–350 rpm |
| Twin-screw compounding | Specific energy input | 0.15–0.25 kWh/kg |
In wax-based hot-melt systems, ELVAX 660 functions as a polymeric backbone that raises cohesive strength and high-temperature creep resistance without producing the high melt viscosity of a 25–28 wt% VA EVA at equal loading. It is mixed in a swept-surface kettle or double-planetary mixer at 150–180 °C with paraffin wax, microcrystalline wax, and rosin ester or hydrocarbon tackifier. The 12 wt% VA content provides sufficient polarity to wet polar surfaces such as corona-treated polyethylene and coated paperboard, while retaining solubility in low-polarity waxes. In a typical 100-part formulation containing 30 parts ELVAX 660, 40 parts paraffin wax, and 30 parts rosin ester, melt viscosity at 180 °C is controlled by both the polymer melt index and the resin-to-wax ratio; higher-VA EVA grades reduce mix viscosity at equivalent loading but lower peel adhesion on nonpolar substrates. High-shear dispersion is not required in wax blending, but dead spots in the kettle must be eliminated because localized wall temperatures above 200 °C accelerate vinyl acetate deacetylation and can generate acetic acid.
Compounded profiles containing calcium carbonate, talc, or carbon black are prepared on a co-rotating twin-screw extruder with an L/D ratio of 40:1 and a side feeder downstream of the polymer melt seal. A typical filler loading of 20–30 wt% calcium carbonate lowers elongation at break from above 700 % to the 300–450 % range when tested under ASTM D638 at 50 mm/min; the reduction is approximately linear with filler volume fraction up to 30 wt%. Carbon black at 2–5 wt% is dispersed in the first mixing zone at screw speeds of 200–350 rpm and specific energy input of 0.15–0.25 kWh/kg. For chemical foaming, azodicarbonamide decomposition at 195–215 °C is matched to the ELVAX 660 melt temperature plateau; the low melt index of 2.5 dg/min provides sufficient melt strength to stabilize cell walls and limit coalescence in profiles with density reductions of 20–40 %.
EVA deacetylation begins to evolve acetic acid at measurable rates when melt temperature exceeds 220 °C and accelerates rapidly above 230 °C. Reported activation energies for EVA deacetylation in inert atmosphere are in the range 170–200 kJ/mol; published data for this specific configuration is limited. The practical consequence on a production line is that a 10 °C increase in melt temperature from 220 °C to 230 °C can shorten the safe residence time by a factor of roughly 2–3. Corrosion-resistant downstream equipment, venting, and strict residence-time control are required for extrusion. Avoid combination with amine-based additives that can catalyze deacetylation or cause premature crosslinking. Stabilization with phenolic antioxidants and a secondary phosphite at total loading of 0.1–0.3 wt% is common for extended heat histories.
In coextruded flexible packaging structures, ELVAX 660 is evaluated as an alternative sealant layer to LDPE and acid-modified ethylene copolymers. The presence of 12 wt% VA reduces the minimum seal initiation temperature by approximately 10–20 °C relative to LDPE of similar density, and broadens the hot-tack window on form-fill-seal lines at sealing pressures of 0.3–0.6 MPa. Heat seal strength measured under ASTM F88 is sensitive to seal-bar temperature, dwell time, and corona treatment level. At equivalent VA content, ELVAX 660 provides a lower seal-through-contamination threshold than ethylene-octene plastomers but a narrower low-temperature flexibility window than a 15–18 wt% VA EVA grade. Testing on a horizontal form-fill-seal machine at 60 packages/min typically shows stable seal transfer when the seal bar temperature is maintained at 110–130 °C.
ELVAX 660 is typically compliant with FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers in food-contact applications, subject to end-use extraction limits and use conditions defined by the finished article. Under EU food-contact regulations, it is evaluated under Regulation (EU) No 10/2011 with an overall migration limit of 10 mg/dm² or 60 mg/kg for the final article. REACH registration is maintained by the manufacturer, and RoHS Directive 2011/65/EU is not triggered for the polymer itself but applies to any pigments, stabilizers, or flame retardants added during compounding. Electrical insulation compounds require testing to the relevant IEC or ASTM harness standards; EVA at 12 wt% VA is not inherently flame retardant and must be formulated with mineral fillers or halogen-free flame retardants to achieve pass rates under IEC 60332-1 or UL 94.
Wire and cable jacketing compounds based on ELVAX 660 are prepared with aluminum trihydrate or magnesium dihydrate fillers at loadings of 50–65 phr, crosslinked with organic peroxides in a continuous vulcanization line, and extruded on a 20:1 L/D single-screw or twin-screw line with melt filtration. The peroxide cure is initiated at 170–190 °C and completed in a heated catenary tube; tensile strength after crosslinking is measured under IEC 60811-501 and heat ageing under IEC 60811-401. Lower VA content reduces polarity-driven moisture absorption but also reduces filler wetting compared with 18 wt% VA EVA; silane coupling agents are therefore added at 0.5–1.0 wt% to maintain elongation and hot-set performance. Published data for this specific configuration is limited; plant trials are required to confirm die build-up and cure speed.
