| HS Code | 249299 |
| Product Name | ELVAX 3165LGZ |
| Chemical Family | Ethylene Vinyl Acetate (EVA) Copolymer |
| Vinyl Acetate Content | 18 wt% |
| Melt Flow Index 190 C 2 16 Kg | 1.2 g/10 min |
| Density | 0.945 g/cm³ |
| Melting Point Dsc | 77 °C |
| Crystallization Temperature | 63 °C |
| Vicat Softening Point | 62 °C |
| Tensile Strength At Break | 19 MPa |
| Elongation At Break | 750% |
| Hardness Shore D | 40 |
| Brittleness Temperature | -65 °C |
As an accredited ELVAX 3165LGZ Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX 3165LGZ Ethylene Vinyl Acetate Copolymer is supplied as free-flowing pellets in 25 kg bags, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | ELVAX 3165LGZ loaded in 20' FCL: 25kg bags, palletized, about 18–20 metric tons per container, secured for safe transit. |
| Shipping | ELVAX 3165LGZ is shipped as solid pellets in multi-layer paper bags or woven polypropylene bags, typically 25 kg net. Keep dry, away from heat, direct sunlight, and incompatible oxidizers. Standard non-hazardous cargo, but ensure ventilation, avoid dust accumulation, and handle gently to prevent bag damage. |
| Storage | Store ELVAX 3165LGZ in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and ignition sources. Keep containers tightly sealed to prevent moisture absorption and contamination. Maintain temperatures below 30°C (86°F). Avoid stacking excessively to prevent deformation. Use within recommended shelf life to ensure consistent processing and performance. |
| Shelf Life | Shelf life is typically two years from manufacture when stored in original, unopened packaging under cool, dry conditions. |
Continuous hot-melt adhesive coating lines for case and carton sealing require backbone resins whose melt viscosity contributes to cohesive strength without exceeding the pumping capacity of gear-pump melters. A low-gel ethylene vinyl acetate copolymer specified as ELVAX 3165LGZ, with a nominal melt index of 0.70 g/10 min under ASTM D1238 at 190 °C/2.16 kg, a vinyl acetate content near 18 wt% determined by FTIR according to ASTM D5594, and a density of approximately 0.94 g/cm³ per ASTM D792, is compounded with hydrogenated C5/C9 tackifier and Fischer-Tropsch wax. The addition range is typically confined to 8–18 wt% of the finished adhesive because the low melt index raises Brookfield viscosity sharply under ASTM D3236; at 160 °C, viscosity moves from about 1,200 mPa·s at 8 wt% EVA to 3,200–4,500 mPa·s at 18 wt% EVA when wax content is held at 20 wt%. Production-scale melters such as Nordson ProBlue or Robatech Concept with heated hose and slot-die applicators show a defined failure path: sustained reservoir temperatures above 185 °C liberate acetic acid from the acetate comonomer, the pH of the melt drops, and char deposits on filter screens and nozzle tips produce intermittent coating-weight deviation. On lines running more than 8 h with low-MI EVA adhesives, replacement of 100-mesh melt filters with 60-mesh units reduces backpressure at the expense of larger gel passage. Slot-die exit lip cleaning intervals are frequently shortened from 24 h to 8–12 h when the formulation exceeds 15 wt% of this backbone unless a phenolic-phosphite stabilizer package is present. Indirect food-contact packaging falls under FDA 21 CFR 177.1350 for the copolymer component, while the finished adhesive must be evaluated for overall migration under EU 10/2011 with food simulants selected for the package type; the responsibility for end-compliance resides with the adhesive formulator because tackifier and wax migration behavior is formulation-specific.
In hot-dip coating of corrugated board and paperboard, paraffin wax with a drop melting point of 62–66 °C per ASTM D3954 is modified with 4–10 wt% low-gel EVA. Because the melt index of this copolymer is 0.70 g/10 min, the resin does not dissolve rapidly in low-viscosity wax at 120 °C; complete homogenization requires a scraped-wall melt tank or double-planetary mixer operating at 130–150 °C for 60–120 min. At 4 wt% EVA, Brookfield viscosity at 121 °C under ASTM D3236 rises from approximately 8–12 mPa·s for unmodified paraffin to 50–120 mPa·s, and at 8 wt% it reaches 180–350 mPa·s; the increase limits immersion-coating speed because excess viscosity produces non-uniform pickup and foam entrapment. The low-gel grade is used when film clarity and freedom from char specks are specified for overwrap and barrier coatings. Coating weight is generally maintained at 25–50 g/m² on corrugated medium, with surface tack assessed by blocking resistance according to ASTM D918. Oil retention in the EVA-wax matrix is evaluated by compression exudation; higher molecular weight EVA reduces oil migration in stacked board at 40 °C, but addition beyond 10 wt% raises melt temperature requirements beyond the thermal stability limit of many wax blends. The processing conflict is a narrow solubility window: below 130 °C dispersion is incomplete, while above 150 °C paraffin oxidation generates aldehydes and ketones that shift color and increase peroxide value. Published data for this specific ELVAX 3165LGZ grade in wax coating is limited; the viscosity and compounding ranges are consistent with EVA wax-modification studies using comparable vinyl acetate content and low melt index.
Modification of paving-grade bitumen with 5–7 wt% low-gel EVA for torching membranes and self-adhesive waterproofing sheets is carried out in a high-shear rotor-stator mill, typically a Silverson or Siefer Trigonal unit, at 170–180 °C after initial dispersion in a heated tank under low-shear agitation for 45–90 min. The low melt index of the EVA contributes to a phase morphology that raises ring-and-ball softening point under ASTM D36 from 48–52 °C for base bitumen to 68–82 °C at 6 wt% addition, while penetration at 25 °C measured by ASTM D5 falls from 70–100 dmm to 42–55 dmm. Low-temperature flexibility of finished membranes is measured by cold bending according to EN 1109; compounds containing 18 wt% VA EVA generally pass at -10 °C but may fail at -20 °C unless plasticizing oil is included. The critical quality risk is storage stability: low-MI EVA exhibits greater viscosity contrast with bitumen than high-MI EVA, and after 72 h at 180 °C in a static oven, a softening-point difference between top and bottom thirds above 5 °C indicates phase separation. Commercial practice often adds functionalized polyolefin or sulfur-crosslinkable oil to limit separation, but crosslinking agents must be introduced after EVA dispersion because premature reaction increases mixer torque and can exceed the 50 kW/m³ power-draw threshold of standard rotor-stator mixers. Thin-film oven aging according to ASTM D1754 is used to monitor skinning and volatile loss; an aged softening-point increase greater than 10 °C indicates oxidation or polymer aggregation. This application is limited to non-food waterproofing because bitumen-containing matrices are outside FDA 21 CFR 177.1350.
In three-layer blown-film lines producing high-dart-impact agricultural or industrial film, 10–20 wt% of the low-gel EVA is dry-tumbled with LLDPE or LDPE base resin before being fed to a grooved-feed extruder. The barrel profile is set from 150 °C at the feed throat to 180 °C at the adapter, with die temperature maintained at 180–190 °C. Because the EVA melt index is low, melt pressure at the screen changer increases; extruders with L/D 30:1 and smooth-bore feed sections show throughput losses of 8–15% compared with neat LLDPE at constant screw speed. The benefit is increased melt strength and bubble stability under high stalk height, reducing gauge variation to ±5% on lines running at 65–85 kg/h. The vinyl acetate comonomer reduces crystalline melting point, measured by differential scanning calorimetry at 10 °C/min, with a broad endotherm near 85–90 °C, and lowers heat-seal initiation temperature in the blended film. Seal strength is tested under ASTM F88/F88M; blends containing 15 wt% of this EVA typically lower seal initiation temperature by 10–15 °C relative to neat LLDPE. The operational boundary is hopper bridging: granules of low-gel EVA with high surface tack after warehouse storage above 30 °C may form lumps in the feed throat; pre-cooling or blending with 1–2 wt% high-density polyethylene powder reduces blockage. Direct food contact in monolayer film is not recommended without migration testing, but the copolymer may be used as a blend component in food-contact layers if the formulation complies with EU 10/2011.
Where high-viscosity carriers are required for pigment wetting in masterbatch production, a low-melt-index EVA with 18 wt% vinyl acetate is used at 20–35 wt% of the carrier system for polyethylene and EVA end products. A twin-screw compounding extruder with L/D 40:1 and segmented kneading blocks operates at 180–200 °C and screw speeds of 300–500 rpm. The polar acetate groups improve adsorption on titanium dioxide and carbon black, lowering filter pressure differential across a 150 μm screen pack. Pigment loadings of 50–60 wt% require high screw torque; the low-MI carrier increases melt temperature through viscous dissipation, so barrel cooling zones are set 20–30 °C below the target melt temperature to avoid exceeding 220 °C, above which acetic acid evolution accelerates corrosion of nitrided barrel surfaces. Underwater pelletizing is performed with water temperature at 10–20 °C; high melt strength reduces strand breakage during start-up. Finished masterbatch is tested for moisture content by ISO 15512:2019 to keep water below 0.08 wt% before letdown. The limitation is compatibility with polypropylene: VA levels above 12 wt% can cause phase separation and delamination in injection-molded PP parts at carrier letdown ratios above 10 wt%. Published data for ELVAX 3165LGZ in PP masterbatch is limited.
Compression-molded and extruded pharmaceutical closure liners require low-gel polymer to avoid surface defects that compromise seal integrity. A low-gel EVA with 18 wt% vinyl acetate and low melt index is used in compounds that may contain polyisobutylene, mineral oil, and calcium carbonate for induction-sealed bottle liners. The lining compound is compounded in a Banbury mixer or twin-screw extruder at 130–160 °C, then calendered into sheets 0.5–1.5 mm thick before die-cutting. Melt flow is tested by ASTM D1238 at 190 °C/2.16 kg, and Shore A hardness of the final compound is typically controlled to 55–75 under ASTM D2240, depending on filler loading. The low gel content reduces fish-eye defects in thin liners, but processing requires filtering the melt through 120–180 μm screen packs, which creates backpressure of 2–5 MPa in a 120 mm single-screw extruder. The material is evaluated for non-cytotoxicity per ISO 10993-5 when specified for pharmaceutical packaging, and compliance with FDA 21 CFR 177.1350 supports use in repeat-use food and pharmaceutical contact layers, subject to end-testing. Gamma sterilization above 25 kGy can yellow and embrittle EVA due to free-radical oxidation; electron-beam processing at 20–30 kGy is less color-active but may still reduce elongation at break by 10–20%. The operational boundary is that unsaturated tackifiers or amine-based additives should be avoided in closure compounds because they initiate premature crosslinking or color drift during melt processing. Published data specific to ELVAX 3165LGZ in pharmaceutical closure liners is limited; the above processing window reflects general EVA-based closure-liner practice.
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ELVAX 3165LGZ Ethylene Vinyl Acetate Copolymer is a random ethylene-vinyl acetate copolymer with a nominal vinyl acetate content of 18 wt% and a melt flow index of 0.7 g/10 min measured under ISO 1133-1:2022 and ASTM D1238 at 190 °C with a 2.16 kg load. Density at 23 °C is 0.940 g/cm³ per ISO 1183-1. The acetate comonomer disrupts polyethylene crystallinity; differential scanning calorimetry at 10 °C/min per ISO 11357-3 shows a broad melting endotherm in the 80 °C–90 °C range. Low-temperature flexibility is reflected in a storage modulus inflection below −20 °C when measured by dynamic mechanical analysis at 1 Hz, though lot-specific thermal data should be taken from the certificate of analysis.
Melt-state characterization of the 0.7 g/10 min grade shows high melt viscosity and pronounced shear thinning. At 160 °C and 1 rad/s, the complex viscosity is approximately one to two orders of magnitude higher than that of a 43 g/10 min EVA grade; at 100 rad/s, the difference narrows because of shear thinning. In a 25:1 L/D single-screw extruder, barrel settings from 120 °C at the feed throat to 160 °C at the die are typical, with screw speed limited to 50 min⁻¹–90 min⁻¹ and head pressure held below 15 MPa to prevent vent flooding.
The LGZ designation identifies a low-gel stabilization package intended for hot-melt and coating lines where molten EVA may reside at 160 °C–180 °C for extended periods. Standard 18 wt% VA low-flow grades such as ELVAX 470 can accumulate oxidized gel in recirculating tank systems; the LGZ package reduces that tendency but does not eliminate gel formation. Gel count is not defined by an ASTM or ISO test method; it is controlled by the supplier’s internal optical gel count procedure and reported on the certificate of analysis. Table 1 compares typical values across adjacent EVA grades.
| Grade | Vinyl acetate (wt%) | Melt index (g/10 min, 190 °C/2.16 kg) | Density at 23 °C (g/cm³) | Operational differentiator |
|---|---|---|---|---|
| ELVAX 3165LGZ | 18 | 0.7 | 0.940 | Low-gel package; extended residence time |
| ELVAX 470 | 18 | 0.7 | 0.940 | Standard stabilization |
| ELVAX 460 | 18 | 2.5 | 0.941 | Moderate flow for compounding |
| ELVAX 450 | 18 | 8.0 | 0.940 | High flow; lower melt strength |
| ELVAX 360 | 25 | 2.0 | 0.950 | Higher VA; lower creep resistance |
Compared with ELVAX 360, the 18 wt% VA matrix of ELVAX 3165LGZ provides lower surface tack and better creep resistance, but less low-temperature impact resistance. Compared with ELVAX 450, the 0.7 g/10 min melt index yields higher viscosity and melt tension, making it preferable where long open time or reduced edge neck-in is a controlling variable.
Hot-melt adhesive production with ELVAX 3165LGZ typically uses 15 wt%–35 wt% copolymer in a hydrocarbon resin or rosin ester formulation. Mixing in a jacketed twin-blade mixer at 150 °C–170 °C under nitrogen blanketing reduces oxidative viscosity drift. The high viscosity requires gear-pump or piston-pump application systems capable of 2 MPa–5 MPa line pressure. Slot-die coaters operating at 160 °C–180 °C require a 30 min heat soak at 150 °C before pump rotation; otherwise the low melt index can cause motor overload. Adhesion to corrugated board may be evaluated by ASTM D1876 T-peel or TAPPI T 821 pin adhesion, with values strongly dependent on tackifier loading and substrate surface energy rather than the EVA grade alone.
On continuous hot-melt lines that force the melt through 30 μm screen packs, gel accumulation can drive filter pressure upward. In a production-scale 100 kg/h co-rotating twin-screw line with 40:1 L/D and vacuum venting at −0.08 MPa, the screen pressure rise should be tracked against a 0.2 MPa/h control limit. If the rate exceeds 0.5 MPa/h, the melt temperature is reduced in 5 °C steps and screw speed is increased to shorten residence time. Published data for this specific configuration is limited; therefore each manufacturing site should run a screen-life trial using the specific adhesive formulation and filter geometry.
Downstream masterbatch and polymer modification operations select ELVAX 3165LGZ for its 18 wt% VA polarity and high-viscosity carrier effect. A 25:1 L/D single-screw extruder with a barrier screw running at 120 °C–160 °C can disperse 40 wt% carbon black at screw speeds of 70 min⁻¹–110 min⁻¹. In injection molding, melt temperatures of 160 °C–190 °C and injection pressures of 80 MPa–120 MPa are typical. The low-flow grade is not recommended for wall sections below 1 mm because short shots and flow marks become probable below 190 °C, and higher temperatures approach the deacetylation boundary.
Sealant tape and solvent-free sealant formulations may incorporate 20 wt%–40 wt% of the copolymer with polyisobutylene and tackifier in sigma-blade mixers at 140 °C–170 °C. The relatively low VA content of 18 wt% contributes to better compression set and creep resistance than higher-VA copolymers, although adhesion to painted steel and polar surfaces is lower than that obtained with 25 wt%–28 wt% VA grades.
In wax modification, 5 wt%–15 wt% ELVAX 3165LGZ is blended with paraffin wax at 120 °C–150 °C. A 5 wt% addition to a 58 °C melting paraffin wax can raise Brookfield viscosity at 120 °C by roughly tenfold, although the exact response depends on wax oil content and molecular weight distribution. The 18 wt% VA level modifies wax crystal habit and improves flexibility without the higher tack contributed by 28 wt% VA EVA grades. Mix time in a stirred vessel is typically 45 min until optical clarity stabilizes; shorter mix times may leave gel-like wax domains visible by transmitted light.
Thermal degradation boundaries are governed by deacetylation. Sustained melt temperature above 200 °C releases acetic acid, promotes gel formation, and accelerates equipment corrosion. Continuous operation should remain below 190 °C when residence time is under 2 min; excursions to 210 °C are permissible only with vacuum venting and immediate purging. The resin is not hygroscopic, but pellets stored at relative humidity above 60% or subject to condensation should be pre-dried at 70 °C for 2 h. Avoid compounding with amine-based stabilizers, strong oxidizing agents, and halogenated flame-retardant packages that require melt temperatures above 200 °C.
For regulatory screening, the base EVA polymer may qualify for food-contact use under FDA 21 CFR 177.1350 and Regulation (EU) No 10/2011. Finished-article migration of vinyl acetate monomer must be verified against the specific migration limit in the applicable regulation. REACH registration is maintained by the manufacturer or importer, and the base pellet is not intentionally halogenated. Table 2 provides the compliance verification matrix.
| Regulation/Standard | Reference/Clause | Scope and Limitation |
|---|---|---|
| FDA food-contact | 21 CFR 177.1350 | EVA copolymers for food-contact articles; end-use migration controls apply. |
| EU plastics regulation | (EU) No 10/2011, Annex I | Specific migration limit for vinyl acetate monomer must be confirmed on the finished article. |
| REACH | (EC) No 1907/2006 | Supplier registration and safety data sheet apply. |
| RoHS II | Directive 2011/65/EU | Base resin is halogen-free; compound additives may alter final status. |
In extrusion coating and lamination, the 0.7 g/10 min melt index supplies higher melt tension than 8 g/10 min EVA grades, which reduces edge neck-in at air gaps between 100 mm and 150 mm. Chill-roll temperature is normally set at 15 °C–25 °C; coating weights of 25 g/m²–40 g/m² are processable, though maximum line speed is determined by draw resonance rather than resin wet-out. ELVAX 3165LGZ does not provide the low-temperature impact toughness associated with 28 wt% VA encapsulant grades; instead it delivers lower tack and better dimensional stability in applications where creep resistance and low gel accumulation are the controlling specifications.
