| HS Code | 311571 |
| Product Name | ELVAX 220W Ethylene Vinyl Acetate Copolymer |
| Resin Type | Ethylene Vinyl Acetate (EVA) Copolymer |
| Vinyl Acetate Content | 28 wt% |
| Melt Index 190 C 2 16 Kg | 2 g/10 min |
| Density | 0.951 g/cm³ |
| Melting Point Dsc | 64°C |
| Crystallization Point | 40°C |
| Vicat Softening Point | 37°C |
| Shore A Hardness | 80 |
| Tensile Strength At Break | 20 MPa |
| Elongation At Break | 800% |
| Brittleness Temperature | -100°C |
As an accredited ELVAX 220W Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX 220W Ethylene Vinyl Acetate Copolymer is supplied as resin pellets in 25 kg polyethylene bags, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | Packed in palletized woven bags, shrink-wrapped and securely stowed in a 20′ FCL container to prevent shifting during transit. |
| Shipping | ELVAX 220W is shipped as non-hazardous thermoplastic pellets in sealed bags, bulk bags, or hopper trucks. Keep dry, away from heat sources and direct sunlight to prevent clumping. Avoid contamination and static buildup; store in a cool, ventilated area before processing. Standard handling with dust control is recommended. |
| Storage | Store ELVAX 220W in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep containers tightly sealed to prevent moisture pickup and contamination. Avoid creating dust clouds; keep away from strong oxidizers. Under these conditions, the material remains stable with good shelf life. |
| Shelf Life | Shelf life is typically 2 years from date of shipment when stored in original, unopened packaging under recommended conditions. |
In high-speed case-sealing and carton-closing lines operating with gear-pump or piston-pump hot-melt delivery at 160–180 °C, ELVAX 220W is compounded into EVA/tackifier/wax hot-melt adhesives at 25–35 wt% to lower application viscosity and maintain rapid substrate wet-out. The grade carries a nominal vinyl acetate content of 28 wt% and melt index of 150 g/10 min determined under ASTM D1238 at 190 °C and 2.16 kg. Finished adhesive viscosity is measured per ASTM D3236 using SC4-27 or SC4-29 spindles; formulations in the region of 30 wt% ELVAX 220W, 40 wt% C5/C9 tackifying resin, and 30 wt% paraffin/microcrystalline wax typically require melt temperatures above 150 °C to hold application viscosity below 1,500 mPa·s for nozzle deposition. Bond performance is assessed by fibre-tear evaluation on corrugated stock after conditioning at 23 °C and 50% RH for 24 h, while heat resistance is ranked by shear adhesion failure temperature under ASTM D4498. The high melt index of ELVAX 220W supports low-viscosity gun application through 0.25–0.51 mm nozzle orifices and heated hoses up to 3 m, but it lowers cohesive strength and SAfT relative to an equivalent formulation using a 43 g/10 min or 25 g/10 min EVA grade. Where sealed cases are exposed to warehouse or truck-trailer temperatures above 60 °C, 10–20 wt% of a lower-MI EVA or a higher crystalline wax fraction is blended to restore high-temperature creep resistance. Continuous melt exposure should be kept below 220 °C; deacetylation above 230 °C releases acetic acid and corrodes unplated carbon steel. Heated hoses, slot-nozzle heads, and tank interiors should use stainless steel or nickel-plated surfaces, and inert-gas blanketing during shutdowns limits oxidative skinning in the melt tank.
The addition of ELVAX 220W to paraffin or microcrystalline wax at 5–20 wt% modifies crystallinity and extends the flexural performance of moisture-resistant corrugated and folding carton board. Melt blending is conducted in jacketed scraped-wall kettles at 120–150 °C; the ethylene segments co-crystallise with paraffin while vinyl acetate domains restrict large crystal growth, reducing brittle fracture when coated board is scored or folded at 0–5 °C. Water vapour transmission rate is measured according to ASTM E96/E96M at 23 °C and 50% RH; at equal coat weight, EVA-modified paraffin coatings generally reduce WVTR relative to unmodified paraffin, though the magnitude depends on substrate porosity, wax penetration, and applied coat weight in the 5–15 g/m² range. Coating viscosity is determined by ASTM D3236; increasing ELVAX 220W content raises low-shear viscosity, which helps limit strike-through into recycled linerboard, but can destabilise curtain coater or slot-die flow when the addition exceeds 20 wt%. For food-contact packaging, the finished coated board must meet extractive limits under 21 CFR 177.1350 for ethylene-vinyl acetate copolymers and the relevant sections of 21 CFR 176.170 for paper and paperboard in contact with aqueous and fatty foods. Low-temperature flexibility is screened by bending conditioned samples around mandrels at 0–5 °C, but published data for ELVAX 220W-specific wax coating flexibility are limited; plant trials should benchmark the grade against a lower-MI EVA reference with similar 28 wt% VA content. Because high-MI EVA can reduce heat-blocking resistance on stacked warm board, wax compounders frequently increase microcrystalline wax content by 5–10 wt% when ELVAX 220W replaces a lower-MI EVA grade. Equipment surfaces in wax kettles are typically plain carbon steel below 200 °C, but any extended excursion above 220 °C requires stainless steel to resist acetic acid attack and gel formation from degraded polymer.
Solvent-borne lamination adhesives formulated with ELVAX 220W are prepared at 20–40 wt% solids in toluene, methylcyclohexane, or toluene/MEK blends, with solution viscosity measured on a Brookfield RV spindle at 25 °C under ASTM D1084. The vinyl acetate content contributes solubility in aromatic and ketone systems and promotes wetting on corona-treated PET, aluminium foil, and oriented polypropylene film. T-peel adhesion is assessed per ASTM D1876 using 25 mm wide strips after solvent removal and 7-day conditioning at 23 °C and 50% RH. Coating viscosity is maintained below 800–1,200 mPa·s for direct gravure or roller application; excessive viscosity produces transfer stars and film-weight variation on cylinders with 100–200 lines per inch, while over-reduction lowers dry film weight below the 2–5 g/m² target required for flexible packaging laminates. Dry-film cohesive strength at 60 °C is limited by the high melt index of ELVAX 220W compared with lower-MI EVA binders, so the grade should not be used as the sole binder in hot-filled or steam-sterilised laminate structures without crosslinking or blending. VOC compliance must be verified against EU REACH restrictions and applicable national coating or solvent-emission regulations; dryer exhaust systems on production lines are specified with activated-carbon beds sized for at least 95% solvent capture. Mix-room and coating-pan grounding is required to prevent static accumulation, and electrical classification follows local ATEX directive requirements for solvent atmospheres. Solvent recovery condensers on three-zone dryers operate with zone temperatures staged from 50 °C to 90 °C to avoid surface skinning before complete solvent release.
Compounding ELVAX 220W as a carrier for white, black, or additive masterbatches is performed on co-rotating twin-screw extruders with L/D 40:1, zone temperatures from 80 °C at the feed throat to 150–170 °C at the die, and screw designs containing two or three kneading blocks for high-shear dispersion. The 150 g/10 min melt flow index under ASTM D1238 enables rapid wet-out of TiO₂ or carbon black at loadings up to 40–60 wt%, while the vinyl acetate comonomer reduces interfacial tension against polar pigments and fillers, improving colour strength after letdown. The same high flow character reduces melt strength, so strand pelletising requires water bath temperatures of 10–20 °C, and a die-face pelletiser is preferred over underwater pelletising to avoid irregular pellet geometry and polymer fines. In polyethylene film letdown at 2–6 wt%, the carrier can shift heat-seal initiation temperature upward by several degrees depending on the antiblock and slip package; seal strength is measured according to ASTM F88/F88M with 0.5 s dwell and 0.275 MPa pressure on a laboratory heat sealer. ELVAX 220W should be predried below 0.05 wt% moisture in a desiccant hopper dryer at 60–80 °C for 3–4 h to prevent hydrolysis in the extruder barrel. Residence time distribution in the twin-screw extruder is kept below 120 s at barrel temperatures above 220 °C to minimise acetic acid evolution from VA-group degradation; downstream metallurgy should be stainless steel. Filter packs with 80–120 mesh screens are typical, and screen-pressure monitoring detects incomplete dispersion of carbon black agglomerates above 20 µm, which may be analysed by film surface inspection. When masterbatches are used in electrical or electronic packaging applications, the finished compound must be screened under RoHS 2011/65/EU for restricted substances; the base EVA resin does not provide self-certification.
In roofing membrane and road asphalt modification, ELVAX 220W is dispersed at 2–5 wt% into 180–200 °C bitumen using high-shear rotor-stator mixers or paddle stirrers with tip speeds of 4–8 m/s for 60–120 min. The addition raises ring-and-ball softening point per ASTM D36 or EN 1427 and reduces penetration per ASTM D5 at 25 °C, while improving low-temperature flexibility in modified bitumen membranes tested by bending at -10 °C. Brookfield viscosity at 135 °C per ASTM D4402 is increased by EVA addition; road-grade binders with unmodified viscosity below 0.3 Pa·s may shift into the 0.5–1.5 Pa·s working range recommended for pumping and compaction in hot-mix asphalt. Phase separation remains the critical limitation: static storage of EVA-modified bitumen at 160–180 °C for more than 24 h can produce a polymer-rich top layer, so tank farms must use slow horizontal agitators at 20–40 rpm and daily recirculation. Published data for ELVAX 220W in paving-grade asphalt are limited compared with lower-MI EVA grades, and laboratory storage stability tests under EN 13399 and elastic recovery tests under ASTM D6084 should be completed before commercial deployment. Processing above 220 °C must be avoided because degradation of the vinyl acetate segment releases acetic acid into the bitumen fume stream; scrubber and ventilation systems should be designed for acid gas removal. The compound should not be combined with amine-based antistrip additives in the same premix without compatibility screening, as acid-base reactions can destabilise the polymer dispersion and reduce storage homogeneity.
Perfect-binding lines running at 8,000–15,000 cycles/h use ELVAX 220W in spine and side-glue formulations at 35–45 wt% EVA content to obtain melt viscosity low enough to penetrate folded paper signatures without excessive squeeze-out at the clamp station. Viscosity is measured on a Brookfield RVT with Thermosel at 150 °C according to ASTM D3236; spine formulations may fall between 2,000 and 4,500 mPa·s, while side-glue applied at higher shear may be formulated in the 1,500–3,000 mPa·s range. The high melt index of ELVAX 220W supports rapid fibre wetting and fast setting on high-speed clamps, but it reduces SAfT values under ASTM D4498. Books exposed to direct sunlight in closed vehicles or heated display shelves above 60 °C can lose page-pull resistance if the formulation is not adjusted with lower-MI EVA or a higher crystalline wax fraction. Cold-flex resistance is screened by opening bound books at -10 °C in a cold chamber after 24 h conditioning; the vinyl acetate content contributes flexibility, but the low molecular weight limit of the high melt flow grade may not meet all cold-crack thresholds without blending. Substrate moisture above 6 wt% in coated paper can reduce adhesion by generating steam at the glue line; sheet moisture is maintained between 4–6 wt%, and glue-pot temperature should not exceed 170 °C to avoid excessive surface skinning. Paper coating pH above 8.5 may retard adhesion development due to calcium carbonate buffering; this is not specific to ELVAX 220W but must be controlled through primer application or increased open time. Continuous melt exposure on perfect-binding lines should be limited to 8–12 h; after 12 h at 160 °C, viscosity may drift upward due to oxidation and char formation, so nitrogen blanketing or daily shutdown cleaning is required to maintain consistent adhesive add-on weight.
Competitive ELVAX 220W Ethylene Vinyl Acetate Copolymer prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615380400285 or mail to sales2@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615380400285
Email: sales2@liwei-chem.com
Flexible payment, competitive price, premium service - Inquire now!
ELVAX 220W is an ethylene vinyl acetate copolymer supplied in pellet form with a nominal vinyl acetate comonomer content of 22 wt% and a melt index of 2.0 dg/min as measured at 190 °C under 2.16 kg load in accordance with ASTM D1238 or ISO 1133-1. The specified density is 0.951 g/cm³ under ASTM D1505 or ISO 1183-1. The vinyl acetate distribution is quantified in supplier technical literature by Fourier transform infrared spectroscopy per ASTM D5594. These properties place the product within the intermediate-polarity segment of the EVA family, where the comonomer content is high enough to suppress polyethylene crystallinity without generating the low-temperature creep and persistent surface tack associated with ethylene-vinyl acetate copolymers above 28 wt% vinyl acetate.
Because the product is a semicrystalline copolymer, thermal history controls the crystalline fraction. Differential scanning calorimetry per ASTM D3418 on unconditioned pellets typically exhibits a broad melting endotherm in the range of 70 °C to 80 °C; this is lower than unmodified low-density polyethylene and lower than EVA grades containing 9–15 wt% vinyl acetate. The melt index value of 2.0 dg/min indicates higher melt viscosity than 25 dg/min high-flow EVA grades, which has direct consequences for hot-melt adhesive pump pressure and wax-blend processing.
At the compounding line, the melt index of 2.0 dg/min imposes only moderate torque in a corotating twin-screw extruder with a 44:1 L/D ratio and screw diameters from 25 mm to 75 mm, provided the feed throat temperature is kept below 100 °C to prevent premature pellet fusion. Barrel setpoints between 120 °C and 170 °C are typical; die melt temperature should not exceed 200 °C for continuous runs. The relatively high vinyl acetate content lowers the threshold for thermal deacetylation compared with lower-VA grades, so vacuum venting at −0.08 MPa gauge or deeper is commonly applied at the penultimate barrel to strip acetic acid and moisture. If atmospheric venting only is used, residual acid can accelerate corrosion of downstream dies and produce surface defects in extrudate.
| Property | Nominal value | Test method |
|---|---|---|
| Vinyl acetate content | 22 wt% | ASTM D5594 |
| Melt index | 2.0 dg/min | ASTM D1238 / ISO 1133-1 |
| Density | 0.951 g/cm³ | ASTM D1505 / ISO 1183-1 |
| DSC peak melting endotherm | 70–80 °C | ASTM D3418 |
Nominal values in Table 1 derive from supplier technical literature and should not be read as lot-to-lot specification limits. Batch-to-batch variation in melt index is typically controlled within supplier specification, but the formulator should verify each lot because EVA viscosity drift can alter wax-blend penetration and adhesive open time. Storage conditions also influence downstream feeding. Pellets stored above 40 °C or conveyed over long distances with high shear can develop surface tack and bridge in the feed throat. Silo cone angles of 70° or greater and low-friction coatings reduce funnel flow and stagnant regions.
When ELVAX 220W is used in hot-melt adhesives for case and carton sealing, it is generally compounded at 15–35 wt% with microcrystalline wax, a C5 or hydrogenated hydrocarbon tackifier, and a hindered phenolic antioxidant. The mixing sequence is critical: the polymer is first swollen or dissolved in the molten wax at 160–180 °C under a nitrogen blanket, then tackifier is added incrementally with low-speed agitation to avoid polymer agglomerates. Application viscosity is commonly measured on a Brookfield thermosel at 180 °C using ASTM D3236; the measured viscosity is not an intrinsic property but a formulation-dependent response. In production-scale heated-hose adhesive systems, pressure-driven filtration through 150–250 μm mesh filter packs is recommended to remove char and undissolved gels; premature filter blockage is an early indicator of thermal degradation.
Substrate adhesion is evaluated by ASTM D1876 T-peel on kraft board, with failure mode recorded because cohesive failure of the adhesive and adhesive transfer to the substrate are distinct quality outcomes. Published data for this specific formulation configuration is limited; adhesion values depend on tackifier softening point, wax type, and coating weight. The 22 wt% vinyl acetate content increases polar interactions with paper and board relative to 18 wt% vinyl acetate EVA, but the same polarity reduces resistance to oil and nonpolar grease.
Thermal deacetylation of ethylene vinyl acetate proceeds by β-elimination and accelerates sharply above 200 °C. Acetic acid evolution is autocatalytic in the melt; once acid concentration builds, chain scission and discoloration become self-accelerating. Production-scale evidence shows that melt temperatures above 200 °C for extended residence can create gel specks, yellowing, and corrosion at die lips. Heated hoses and gear pumps should therefore be operated with forward flow rather than static soak. If a line stops for more than 30 min, the adhesive melt should be dropped or the hose temperature reduced to 150 °C.
For hot-melt mixing, vertical mixers with close-clearance helical impellers are preferred over high-shear dispersers because high-shear can generate frictional heat above 200 °C and initiate deacetylation. Jacket temperature should be limited to 180 °C while the melt temperature is monitored by an immersed probe; if the melt temperature exceeds 195 °C, the heating medium should be throttled. Nitrogen blanketing at 0.02–0.05 MPa positive pressure suppresses oxidative skin formation.
Pre-drying at 60 °C for 4 h is applied when pellets have been exposed to relative humidity above 60%. The target moisture content is below 0.05 wt%; higher moisture causes hydrolysis and foaming at melt temperatures above 180 °C. Incompatibilities include strong acids, strong bases, and chlorinated solvents, which accelerate ester cleavage or swell the copolymer. Amine-based additives should be carefully evaluated because residual alkalis can catalyze deacetylation and shift pH in water-contact formulations.
Compared with an EVA containing 18 wt% vinyl acetate and a similar melt index, ELVAX 220W has a lower degree of crystalline polyethylene order, a lower peak melting endotherm, and a lower modulus at ambient temperature. This shifts performance in hot-melt adhesives toward increased adhesion to polar paper and board surfaces and improved low-temperature flexibility, but it also lowers heat resistance and increases residual tack at 60–70 °C. The lower crystallinity is measurable by ASTM D3418 as a smaller melting enthalpy; formulation adjustments, such as higher-melting wax or increased filler, are required where heat resistance under load is a critical requirement.
Compared with an EVA containing 28 wt% vinyl acetate, ELVAX 220W displays higher melt viscosity at equivalent temperature because the residual crystallites persist as physical crosslinks until the melt temperature exceeds the crystalline melting range. As a result, it may require higher application temperatures or greater pump pressure in hot-melt grain systems, but it contains less of the tacky amorphous fraction than higher-VA copolymers. The 22 wt% vinyl acetate level is therefore selected for applications that require wax compatibility and moderate polar adhesion without the creep and blocking tendency of higher-VA copolymers.
In polymer modification of paraffin wax for investment casting patterns, ELVAX 220W is dissolved at 170 °C to raise viscosity and reduce brittle fracture of the wax pattern. The addition level is typically 10–20 wt%. The low melt index of 2.0 dg/min provides higher melt viscosity than a 25 dg/min EVA grade, which reduces slumping when the pattern is cooled under pressure. Dimensional stability should be checked by thermomechanical analysis according to ASTM E831 or differential scanning calorimetry per ASTM D3418.
For food-contact uses, the polymer class is subject to 21 CFR 177.1350; compliance of the final article depends on extractive limitations and the full formulation, not on the base resin alone. Processing sites should consult the supplier’s food-contact statement for grade-specific data. For industrial uses, standard safety data sheet guidance applies; decomposition products include acetic acid, carbon monoxide, and low-molecular-weight hydrocarbons.
