| HS Code | 972794 |
| Vinyl Acetate Content | 16 wt% |
| Melt Index 190 C 2 16 Kg | 8 g/10 min |
| Density | 0.940 g/cm³ |
| Melting Point Dsc | 77 °C |
| Tensile Strength At Break | 17 MPa |
| Elongation At Break | 750% |
| Flexural Modulus | 40 MPa |
| Shore D Hardness | 44 |
| Brittle Temperature | -76 °C |
| Vicat Softening Point | 58 °C |
As an accredited ELVAX 650Q Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX 650Q Ethylene Vinyl Acetate Copolymer is supplied as free-flowing pellets in 25 kg multi-wall paper bags. |
| Container Loading (20′ FCL) | ELVAX 650Q loaded as 20′ FCL, palletized bags stowed securely, ventilated container, protected from moisture, heat, and direct sunlight. |
| Shipping | ELVAX 650Q is shipped as solid pellets in multi-layer paper bags or drums, protected from moisture and heat. Non-hazardous under normal transport, it requires clean, dry conditions and segregation from strong oxidizers. Standard freight handling suffices, with storage temperatures below 40°C to prevent agglomeration. |
| Storage | Store ELVAX 650Q in a cool, dry, well-ventilated area away from heat, sparks, open flames, and direct sunlight. Keep the original container tightly closed to prevent moisture absorption and contamination. Avoid exposure to oxidizing agents. Maintain moderate temperatures and protect from physical damage. Proper storage preserves product quality and processing characteristics. |
| Shelf Life | Shelf life is typically 2 years from shipment when stored in original, unopened containers in cool, dry conditions. |
Adhesion of ELVAX 650Q to aluminum foil in aseptic packaging is controlled by the 12 wt% vinyl acetate content and the oxidation state of the melt curtain during extrusion coating. For sealant layers on foil, paperboard, and metallised polyester, the resin is processed at 100 wt% solids; where converters require lower seal initiation temperature without sacrificing hot tack, 15–35 wt% of ELVAX 650Q is dry-blended or compounded into an LDPE carrier with a melt index of 7–9 g/10 min. Regulatory compliance for the food-contact layer follows FDA 21 CFR 177.1350(a)(1) and EU Regulation 10/2011, with overall migration tested under EN 1186-1:2002 and heat-seal strength measured according to ASTM F88/F88M-21 after the filled package has passed sterilisation cycles using 35% hydrogen peroxide at 70 °C. Downstream processing uses a single-screw extruder with a 90 mm screw diameter and 30:1 L/D ratio, a barrier screw design, and a coat-hanger slot die with a lip gap of 0.6 mm. Melt temperature is maintained between 260 °C and 288 °C; the air gap between die exit and chill roll is set at 150–200 mm to promote adhesion without excessive surface oxidation, while the chill roll is held at 15–20 °C at line speeds of 180–300 m/min. Operation below 260 °C produces measurable peel-strength variation on foil, and residence time above 10 min at 288 °C increases gel formation risk. Terminal articles include aseptic brick packs for juices and dairy, paperboard cups, pharmaceutical blister lidding, and laminated toothpaste tubes.
ELVAX 650Q enters hot-melt formulations as the polymeric backbone for case and carton closing where substrate wetting must be completed before compression belts engage. The regulatory frame for folded carton and corrugated packaging is FDA 21 CFR 175.105 for indirect food contact and Regulation (EC) No 1935/2004 in EU markets, with migration testing according to EN 1186-1:2002. Formulation addition of ELVAX 650Q falls between 18 wt% and 35 wt%; below 18 wt% cohesive strength in board-to-board bonding is reduced under ASTM D897-08, while above 35 wt% Brookfield viscosity at 175 °C exceeds 1,500 mPa·s under ASTM D3236-88(2014), forcing higher application temperatures and increasing char formation in heated transfer lines. The balance of the formulation comprises a C5 or hydrogenated rosin ester tackifier at 35–50 wt%, a paraffin or Fischer-Tropsch wax at 20–35 wt%, and a hindered phenolic antioxidant at 0.3–1.0 wt%. Production compounding uses a jacketed, nitrogen-blanketed mixer of 200–500 L capacity held at 150–180 °C, with discharge through a heated gear pump and slot or bead applicator at 150–165 °C. Lines operating above 20,000 cases/hour require open time below 4 s and set time below 1.2 s; these values are governed primarily by wax addition rather than EVA concentration. Terminal products include beverage multipack wraps, case erecting and sealing lines, bookbinding spines, and folding cartons for frozen and dry foods.
Twin-screw compounding of pigment concentrates utilizing ELVAX 650Q as carrier resin is deployed because the 12 wt% vinyl acetate content improves pigment wetting without the screw-torque penalty associated with higher-VA copolymers. In polyolefin film and injection moulding masterbatches, ELVAX 650Q is added at 15–40 wt% with organic or inorganic pigment at 20–50 wt%, external or internal lubricant at 5–10 wt%, and the balance as LDPE or LLDPE. Compliance for masterbatches entering food packaging references EU Regulation 10/2011 and, where the concentrate forms a coating component, FDA 21 CFR 175.300; melt mass-flow rate of the carrier is controlled by ISO 1133-1:2022 at 190 °C/2.16 kg. Compounding is performed on a co-rotating twin-screw extruder with a 44:1 L/D ratio and a 50 mm screw diameter, using side feeding of pigments at 400–600 min⁻¹, a melt temperature of 180–220 °C, and a specific mechanical energy input of 0.18–0.25 kWh/kg to limit degradation of low-molecular-weight wax components. Batch-to-batch colour strength is assessed by ISO 787-25:2019 dispersibility and spectrophotometric ΔE values below 1.0 against a sealed reference. Terminal downstream products include polyethylene film masterbatches for retail packaging, injection moulded cap concentrates, and extrusion profile colour compounds.
Closed-cell EVA foam production from ELVAX 650Q occupies the segment where melt strength and expansion ratio must be balanced in compression moulded midsole blanks and technical gaskets. The crosslinkable formulation uses ELVAX 650Q at 100 phr, dicumyl peroxide at 1.0–1.5 phr, azodicarbonamide at 2.0–3.0 phr, zinc oxide at 0.5–1.0 phr, and zinc stearate at 0.5–1.0 phr. Peroxide loadings above 1.5 phr increase crosslink density but can reduce elongation at break measured by ISO 1798:2008 to values below 200%, promoting flex-line cracking in midsole service. The compliance framework includes ISO 845:2006 for apparent density, ISO 1798:2008 for tensile properties of flexible cellular material, and REACH Regulation (EC) No 1907/2006 Annex XVII restrictions on blowing-agent decomposition products; EU processors must verify workplace exposure conditions under Directive 2004/37/EC for residual azodicarbonamide handling. Downstream manufacturing begins with internal mixing at 105–120 °C for 8–12 min to disperse azodicarbonamide and dicumyl peroxide without premature decomposition, followed by two-roll milling at 95–105 °C and pelletisation. Expansion and crosslinking occur in a 1,200–2,000 kN compression press at 165–175 °C and 10–15 MPa for 8–12 min, with part thickness limited to 60 mm to avoid internal temperature gradients. Terminal product categories include footwear midsoles, insoles, gasket strips, and expansion joint filler in construction.
Low-voltage halogen-free cable jackets formulated with ELVAX 650Q accept high filler loadings because the 12 wt% vinyl acetate monomer improves polarity relative to LLDPE and the melt index of 8 g/10 min permits dispersion of aluminium trihydrate without excessive screw torque. The compound typically includes ELVAX 650Q at 60–80 phr, linear low-density polyethylene at 20–40 phr, aluminium trihydrate or magnesium dihydrate at 100–150 phr, vinyl silane coupling agent at 0.5–1.0 phr, and antioxidant at 0.2–0.5 phr; filler loading is adjusted to achieve limiting oxygen index values above 35% under ISO 4589-2:2017. Compliance for the finished jacket follows IEC 60502-1:2021 for low-voltage power cable sheathing, IEC 60332-1-2:2015 for vertical flame propagation on a single wire, and RoHS Directive 2011/65/EU for restricted substances. Compounding uses a co-rotating twin-screw extruder with a 36:1 L/D ratio and a 75 mm screw diameter, with melt temperature limited to 160–200 °C to prevent aluminium trihydrate dehydration. After strand pelletising, the jacket is extruded on a single-screw cable line with a 25:1 L/D ratio, a crosshead die, and melt temperature of 180–220 °C, followed by water cooling at 20–40 °C. Published data for ELVAX 650Q in high-voltage insulation configurations is limited; the resin is specified for sheathing and bedding layers rather than primary insulation. Terminal articles include halogen-free building wire, control cables for rail and shipboard applications, and data-cable jackets requiring low smoke density.
Closure liners injection moulded from ELVAX 650Q provide a deformable seal against glass and PET bottle finishes without external plasticizers that would migrate into the packaged liquid. The formulation uses ELVAX 650Q at 100 wt% or as a 70–85 wt% blend with a high-flow LLDPE when the closure design includes a rigid snap-fit ring; slip and antiblock packages are added at 0.05–0.15 wt% to prevent lid nesting during automated feeding. Compliance for pharmaceutical and food closures references FDA 21 CFR 177.1350 for EVA copolymers, USP <87> cytotoxicity for elastomeric closures where applicable, and ISO 10993-5:2009 for pharmaceutical packaging components; taint and odour testing is conducted according to EN 1230-1:2009. Injection moulding is performed on presses with clamp force between 800 and 2,000 kN and a 24–48 cavity cold-runner mould; melt temperature is set at 180–240 °C, mould temperature at 10–30 °C, injection pressure at 60–100 MPa, and holding pressure at 40–60 MPa for 3–6 s. Warpage in liners with diameter greater than 40 mm is controlled by maintaining a maximum cavity-to-cavity mould temperature difference of 3 °C; cycle times below 15 s can increase gate-stringing defects on cold-runner systems. Terminal parts include beverage cap liners for carbonated soft drinks, pharmaceutical syrup bottle seals, cosmetic jar gaskets, and induction-seal backing liners.
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ELVAX 650Q ethylene vinyl acetate copolymer is a pelletized low-to-medium vinyl acetate resin whose principal specifications define its position between unmodified polyethylene and high-vinyl-acetate EVA grades. The copolymer carries a nominal 12 wt% vinyl acetate comonomer content determined by Fourier-transform infrared spectroscopy according to ASTM D5594. Melt mass-flow rate is 8.0 g/10 min at 190 °C under a 2.16 kg piston load when tested to ISO 1133-1:2022, and solid-state density is 0.933 g/cm³ under ASTM D1505. These three values establish the primary commercial boundary between ELVAX 650Q and adjacent grades such as ELVAX 550 and ELVAX 750. In hot-melt adhesive production, the resin is dry-blended with tackifying esters, hydrocarbon resins, and waxes before high-shear mixing in heated sigma-blade kneaders at 150–170 °C. In coextruded flexible packaging, it is metered into polyethylene sealing layers to reduce seal initiation temperature while retaining melt strength for bubble stability. Published data for exact seal-initiation temperatures of this specific configuration under ASTM F2029 is limited.
The comonomer fraction in an ethylene vinyl acetate copolymer does not act as an inert diluent; it disrupts polyethylene crystallinity and raises the concentration of polar acetate side groups. At 9 wt% vinyl acetate, the polymer retains a higher crystalline fraction, greater stiffness, lower surface polarity, and reduced adhesion to polar substrates. At 15 wt% vinyl acetate, crystallinity drops further, flexural modulus under ASTM D790 decreases, elongation at break under ASTM D638 generally increases, and peel adhesion to corona-treated polyester and aluminum foil improves. ELVAX 650Q at 12 wt% vinyl acetate occupies an intermediate position: it retains enough crystallinity for dimensional stability in paraffin-wax blends and packaging sealants while providing sufficient polar interaction for adhesive wet-out on paperboard and metalized films.
| Grade | Vinyl acetate content (wt%) | Melt mass-flow rate at 190 °C/2.16 kg (g/10 min) |
|---|---|---|
| ELVAX 750 | 9 | 7.0 |
| ELVAX 650Q | 12 | 8.0 |
| ELVAX 550 | 15 | 8.0 |
| ELVAX 660 | 12 | 2.5 |
This comparison has direct consequences for formulation. In a hot-melt adhesive, replacing a 9 wt% vinyl acetate grade with ELVAX 650Q generally improves adhesion to polar cellulosic substrates while reducing the blocking tendency seen with 15 wt% vinyl acetate grades. In wax modification, the 12 wt% acetate content raises paraffin-wax flex temperature and reduces flaking without requiring the higher stabilizer loading often needed for more polar copolymers. In film sealing layers, the same intermediate polarity lowers heat-seal temperature relative to low-vinyl-acetate grades, but the improvement is smaller than that obtained with 18–28 wt% vinyl acetate resins.
Melt processing of ELVAX 650Q in hot-melt adhesive production commonly starts with pre-blending of pellet, tackifier, and wax in a low-intensity ribbon blender. The blend is then fed into a jacketed sigma-blade kneader or continuous twin-screw compounder with screw diameter of 70–90 mm and length-to-diameter ratio of 40:1. Melt temperature at the die should be maintained at 160–180 °C for slot-die coating; exposure above 230 °C accelerates deacetylation and generates acetic acid vapor. Vent ports should be connected to an exhaust system with acid-neutralizing scrubbers. On a 75 mm twin-screw extruder with 40:1 L/D running at 350–500 rpm, high-shear dispersive mixing can create localized melt zones above 220 °C; barrel zones must therefore be profiled to prevent temperature overshoot in the mixing sections. Published data for pressure drop across slot-die coat hangers using this exact grade is limited.
At a constant vinyl acetate content of 12 wt%, melt mass-flow rate becomes the primary rheological variable separating ELVAX 650Q from ELVAX 660 and ELVAX 670. ELVAX 650Q has a melt-flow rate of 8.0 g/10 min; ELVAX 660 is specified at 2.5 g/10 min, and ELVAX 670 at 0.35 g/10 min under the same ISO 1133-1:2022 condition. The higher melt-flow rate of ELVAX 650Q corresponds to lower molecular weight, reduced melt viscosity, and faster flow into porous substrates. This is advantageous in roll-coating and spray-application equipment where the coating head operates at 160–180 °C and requires low viscosity for uniform transfer.
A lower-melt-index alternative such as ELVAX 660 provides higher cohesive strength, improved creep resistance under load, and better hot-tack at elevated temperature. In case-and-carton sealing lines that hold a bond under sustained stress, adhesive formulators may select ELVAX 660 or ELVAX 670 for the same 12 wt% acetate level. The trade-off appears in pumpability and wet-out: ELVAX 650Q generates lower hydraulic pressure in gear pumps at equivalent coat weight, and it can be applied at temperatures 10–20 °C lower than a 2.5 g/10 min grade without viscosity-related transfer defects. The choice between these grades should be governed by measured viscosity-shear-rate profiles under ISO 11443:2021, not by melt index alone.
In continuous adhesive coating lines, ELVAX 650Q is compounded with hydrocarbon tackifiers and microcrystalline waxes to produce a homogeneous melt. Batch-to-batch variation in melt mass-flow rate of ±0.5 g/10 min can shift gear-pump speed by several percent when coat weight is held constant. For this reason, a gravimetric feed system and a positive-displacement gear pump with closed-loop pressure control are preferred. The molten compound is filtered through a 200–250 µm breaker plate and slot-die coated onto kraft paper or polyester film at line speeds of 100–300 m/min. At these speeds, the low melt viscosity of ELVAX 650Q supports leveling, but the formulator must compensate for lower cohesive strength with higher-molecular-weight wax or higher tackifier content when the finished adhesive is exposed to 50–60 °C storage conditions.
Resin handling constraints follow from the acetate side groups rather than from high hygroscopicity alone. ELVAX 650Q is not a highly hygroscopic resin, but condensation on cold pellet surfaces at relative humidity above 60% can introduce surface water into the feed throat. A desiccant hopper dryer with a dew point below -40 °C and inlet air at 60 °C for 2 h is adequate to remove surface condensation before extrusion. Drying should not exceed 70 °C because pellet blocking may occur in the hopper cone.
Thermal degradation of the vinyl acetate units proceeds by deacetylation when the melt is held above 230 °C or when residence time is excessive at lower temperatures. The released acetic acid can corrode non-nitrided steel screws, barrel sections, and die lips. Equipment used for compounding ELVAX 650Q should incorporate nitrided or bimetallic screw elements and stainless-steel downstream melt piping. Direct contact with strong oxidizing agents, chlorinated solvents, or open flames should be avoided. For food-contact applications, compliance must be confirmed against FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers and 21 CFR 175.105 for adhesive components; grade-specific regulatory confirmation should be obtained from the manufacturer before commercial use.
