| HS Code | 397870 |
| Vinyl Acetate Content | 9 wt% |
| Melt Flow Rate 190 C 2 16kg | 8 g/10 min |
| Density | 0.930 g/cm³ |
| Melting Point Dsc | 100 °C |
| Crystallization Point Dsc | 72 °C |
| Vicat Softening Point | 76 °C |
| Tensile Strength At Break | 20 MPa |
| Elongation At Break | 700% |
| Flexural Modulus | 35 MPa |
| Shore Hardness A | 90 |
As an accredited ELVAX 3124 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX 3124 Ethylene Vinyl Acetate Copolymer is supplied as free-flowing pellets in 25 kg multiwall paper bags. |
| Container Loading (20′ FCL) | Load ELVAX 3124 bags onto pallets, stow tightly in 20′ FCL, secure with lashing, ensure dry ventilation. |
| Shipping | ELVAX 3124, an ethylene vinyl acetate copolymer, ships as thermoplastic resin pellets. It is non-hazardous under normal transport conditions, but packaging must protect against moisture and contamination. Store away from heat sources and oxidative materials. Ensure proper labeling and keep containers sealed during transit to maintain material integrity. |
| Storage | Store ELVAX 3124 in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly closed to prevent moisture absorption and contamination. Avoid contact with strong oxidizers. Maintain temperatures below 30°C (86°F) for optimal stability. Use proper labeling and follow local regulations for polymer storage. |
| Shelf Life | Shelf life is typically indefinite when stored in a cool, dry area, away from sunlight and heat sources. |
In flexible packaging structures where a heat-sealable polyolefin layer is extrusion-coated onto aluminium foil, paperboard, or biaxially oriented polypropylene, ELVAX 3124—an ethylene-vinyl acetate copolymer with a nominal vinyl acetate content of 9 wt% and a melt flow rate of 7 dg/10 min at 190°C/2.16 kg per ASTM D1238-20 and ISO 1133-1:2022—serves as the sealant resin or as a 15–30 wt% modifier in LDPE to lower seal initiation temperature and improve hot-tack strength. Compliance for direct food contact is evaluated under FDA 21 CFR 177.1350(a), which permits ethylene-vinyl acetate copolymers for food-contact articles subject to extractable limits; for laminated structures where the sealant is separated from food by a functional barrier, the adhesive lamination layers are assessed under FDA 21 CFR 175.105 and EU Regulation (EU) No 10/2011 Annex I. Production-scale equipment typically consists of a single-screw extruder with L/D 24:1–30:1, a barrier screw with a Maddock mixing section, and a flat die positioned over a chill roll. The temperature profile from hopper to die is maintained at 180°C–260°C, with die lip temperatures at 270°C–290°C; the melt temperature at the die should not exceed 288°C, because prolonged residence time above this threshold accelerates acetic acid evolution via deacetylation and can corrode downstream tooling. Neck-in at the die, draw resonance at high line speeds, and adhesion loss on corona-treated substrates are the dominant processing constraints; air gap settings of 150–250 mm and line speeds of 100–300 m/min are adjusted to balance coating thickness uniformity with adhesion to primed or plasma-treated foil. Hot-tack strength is measured on the line by ASTM F1921-12, and seal initiation temperature by ASTM F2029-16. Terminal finished product types include aseptic liquid packaging cartons, dry food sachet laminates, pharmaceutical unit-dose lidding, and peelable lidding for dairy cups.
Hot-melt packaging adhesives formulated with ELVAX 3124 typically contain 25–35 wt% copolymer, 20–30 wt% paraffin or microcrystalline wax, 30–50 wt% rosin ester or hydrocarbon tackifier, and 0.5–1.0 wt% hindered phenolic antioxidant. The low vinyl acetate content of 9 wt% reduces low-temperature flexibility relative to higher-VA grades but improves wax compatibility and thermal stability, which is relevant in high-speed case and carton sealing where cold-set times must be short and residual tack must drop below a board-to-board blocking threshold. Regulatory status for food packaging applications is governed by FDA 21 CFR 175.105 for adhesives used in packaging with incidental food contact, and by REACH Regulation (EC) No 1907/2006 for the European market; specific migration limits under EU Regulation (EU) No 10/2011 apply only when the adhesive layer is not separated by a functional barrier. Production processing in jacketed sigma-blade mixers or high-torque planetary mixers is carried out at 175°C–190°C under nitrogen blanketing; the EVA resin is first melted with the antioxidant, then wax is added, and finally tackifier is metered to control the Brookfield viscosity measured per ASTM D3236-15 at 180°C using spindle 27. Viscosity targets for corrugated case sealing typically fall in the 1,000–3,000 mPa·s range, but formulations exceeding 8 h of hold time at temperature exhibit a measurable increase in gel content, charring, and acetic acid evolution. Terminal finished product types include corrugated case and carton closing adhesives, bookbinding spine adhesives, pressure-sensitive label adhesives, and heat-seal coatings for paperboard trays.
Compounding EVA-based additive concentrates for polyolefin film manufacturing uses the 9 wt% vinyl acetate segments to wet particulate fillers and pigments while maintaining a melt viscosity high enough to prevent phase separation in strand pelletizing. Typical carrier loadings range from 40–70 wt% ELVAX 3124, with active additives at 20–40 wt%, dispersant at 0.5–2.0 wt%, and process stabilizer at 0.1–0.5 wt%. Regulatory compliance under REACH Regulation (EC) No 1907/2006 and, where the masterbatch is used in food-contact packaging, under FDA 21 CFR 177.1350 and EU Regulation (EU) No 10/2011 requires that additive actives are individually cleared for the intended final use. Downstream production is performed on co-rotating twin-screw extruders with L/D 44:1, segmented screws with kneading blocks, side feeders for fillers, and melt filtration through 50–120 µm screen packs; barrel temperatures are profiled from 150°C at the feed throat to 195–210°C at the die. Pelletizing is typically through a strand water bath or underwater pelletizer, and pellet hardness must be sufficient to survive pneumatic conveying without dusting. Terminal finished product types include slip/antiblock masterbatches, UV stabilizer concentrates, white masterbatches, and processing aid concentrates for blown film and cast film extrusion.
In tubular blown film coextrusions for frozen food packaging, ELVAX 3124 is blended into the sealant skin layer at 10–25 wt% with LLDPE or LDPE to reduce seal initiation temperature under ASTM F2029-16 while retaining low-temperature puncture resistance determined by ASTM D5748-19. The film production process uses monolayer or coextrusion dies of 150–300 mm diameter, die gaps of 1.2–2.0 mm, blow-up ratios of 2.2–2.8, and frost line heights of 8–12 die diameters; barrel temperatures from 170°C to 210°C and melt temperatures of 195–210°C prevent gel formation while allowing stable bubble geometry. Because the sealant layer can be the direct food-contact layer, compliance with FDA 21 CFR 177.1350(a) and EU Regulation (EU) No 10/2011 Annex I is required for the specific food type and temperature condition; migration testing for the final film is conducted under EU Regulation (EU) No 10/2011 using food simulants according to EN 1186-1:2002 and EN 13130-1:2004 where applicable. Terminal finished product types include IQF vegetable bags, frozen seafood pouches, bakery overwrap, and form-fill-seal film for ice cream and prepared frozen meals.
Modification of polypropylene or polyethylene injection-molding compounds with ELVAX 3124 is implemented at 5–15 wt% to improve impact resistance and melt homogeneity without reducing flexural modulus below part specification under ASTM D790-17. The addition ratio is constrained by the onset of acetic acid release; when barrel temperatures exceed 220°C and residence time exceeds 25 min, deacetylation can produce surface splay, clamp-face deposits, and reduced molecular weight in the EVA phase. Processing is carried out on injection molding machines with clamp force settings from 800–3,000 kN, screw designs with low-compression ratios and free-flow check rings, and mold temperatures of 20–40°C. Melt temperatures are maintained at 195–215°C, and the material is pre-dried at 60°C for 4 h if ambient relative humidity exceeds 60%. Regulatory documentation for food-contact packaging components and consumer goods relies on FDA 21 CFR 177.1350 for the EVA phase, EU Regulation (EU) No 10/2011, and RoHS Directive 2011/65/EU for restricted substances. Published data for this specific injection molding configuration is limited; industrial trials should confirm actual tensile and impact performance per ASTM D638-14 and ASTM D256-23 before specification lock. Terminal finished product types include linerless closure skirts, tamper-evident overcap components, appliance housing components, and thin-wall packaging containers.
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ELVAX 3124 ethylene vinyl acetate (EVA) copolymer is a low-vinyl acetate extrusion-grade resin supplied as free-flowing pellets. Manufacturer technical data list vinyl acetate comonomer incorporation at 9 wt%, melt flow rate at 2.5 dg/min under ISO 1133-1:2022 / ASTM D1238 conditions of 190 °C and 2.16 kg load, and solid-state density at 0.930 g/cm³ per ASTM D792. Differential scanning calorimetry per ASTM D3418 identifies a peak melting endotherm near 96 °C; Vicat softening temperature measured per ASTM D1525 is reported at 78 °C. Tensile stress at break is 19–22 MPa on ASTM D638-14 Type IV specimens pulled at 50 mm/min, elongation at break is 700–800%, and Shore D hardness is 52–55 per ASTM D2240. The grade is used in flexible packaging film, extrusion coating, profile extrusion, injection molding, wax modification, and hot-melt adhesives. Compared with higher-vinyl acetate EVA copolymers, ELVAX 3124 retains greater crystallinity, higher modulus, and a higher continuous-use temperature ceiling, but has lower polarity and requires higher seal initiation temperatures.
Melt temperature control is governed by deacetylation kinetics rather than by screw metallurgy alone. On a corotating twin-screw extruder with 40:1 L/D ratio, barrel set points are maintained from 130 °C in the feed throat to 190 °C at the die adapter, and melt thermocouple readings are held below 210 °C. Acetic acid release becomes measurable above 230 °C; the resulting acid-catalyzed chain scission increases melt flow rate and reduces film impact resistance. For a 45 mm single-screw extruder with 24:1 L/D and 2.8:1 compression ratio, screw speed should be limited to 80–120 rpm when the transition zone is shorter than 8 D. Production records show that surface defects on cast film increase when residence time exceeds 12 min at 205 °C. Pre-drying at 60 °C for 3 h is required only when pellets have been stored below dew point or at relative humidity above 60%; condensation on cold pellet surfaces can cause hydrolytic degradation in the feed section.
Screw power draw on a 45 mm single-screw extruder running 30 kg/h at 100 rpm typically remains between 3.5 kW and 4.5 kW for ELVAX 3124. Power consumption increases by 8–12% when the die gap is reduced from 2.0 mm to 1.2 mm, while melt pressure before the screen pack rises from 12 MPa to 18 MPa. Screen pack filtration at 60 mesh or finer removes crosslinked gel particles that would otherwise produce fisheyes in 20 µm cast film. Fillers and processing aids shift this thermal boundary. Calcium carbonate loadings above 10 wt% raise melt viscosity and require barrel temperatures to be raised by 3–5 °C; however, the die zone should not exceed 195 °C because filler-induced viscous heating can push local melt temperature past 220 °C even when barrel set points remain low. Titanium dioxide at 4–6 wt% has a minor effect on melt flow rate but increases thermal conductivity, which can reduce melt thermocouple error by 2 °C. Amine-based antioxidant packages should be avoided where possible; comparative production data indicate that some amine stabilizers promote discoloration in EVA at processing temperatures above 200 °C. Published data for acid scavenger optimization in ELVAX 3124 is limited; zinc stearate at 0.05–0.10 wt% is used to buffer residual acetic acid, but addition above 0.2 wt% can create plate-out on chilled rolls.
During blown film conversion on a 45 mm extruder with 30:1 L/D, the recommended barrel profile spans 150 °C to 185 °C, with die temperature held at 185–190 °C and a die gap of 1.5–2.0 mm. A blow-up ratio of 2.2:1 to 2.8:1 stabilizes bubble geometry without excessive transverse orientation; frostline height remains between 250 mm and 400 mm above the die for 25–50 µm films. Cast film lines running ELVAX 3124 at 25 µm thickness typically use melt temperatures of 210–230 °C and chill roll temperatures of 15–25 °C. Extrusion coating onto paperboard may require melt temperatures up to 230 °C to achieve adequate oxidation and adhesion to porous substrates. Higher melt temperatures reduce draw resonance but accelerate vinyl acetate elimination; therefore the tip melt temperature window is commonly held within ±5 °C of the 210 °C set point.
Foam extrusion of ELVAX 3124 with azodicarbonamide at 0.5–1.5 phr requires a melt temperature window of 170–185 °C; below 165 °C gas decomposition is incomplete, and above 190 °C cell coalescence produces gross density fluctuations from 45 kg/m³ to 80 kg/m³ within a single run. Nucleation with talc at 0.1–0.3 phr reduces mean cell diameter from 0.8 mm to 0.4 mm on a 65 mm tandem foam line. Crosslinking-grade EVA copolymers with higher VA content are typically preferred for chemically foamed shoe soling because they accept peroxide and blowing agent uniformly; published data for radiation-crosslinked ELVAX 3124 foam is limited, and the low VA fraction narrows the peroxide loading window to 0.3–0.5 phr before scorch occurs in the extruder.
Addition of ELVAX 3124 to paraffin wax at 3–8 wt% increases melt flexibility and reduces syneresis without lowering Mettler drop point below 65 °C per ASTM D3954. In candle and coating formulations, the copolymer is pre-blended in a heated turbine mixer at 150–170 °C under nitrogen; shear rate during wax dispersion is typically 200–500 s⁻¹. Hot-melt adhesive formulations incorporating ELVAX 3124 at 10–20 wt% with ethylene-vinyl acetate-compatible tackifiers show Brookfield viscosity values between 800 mPa·s and 1,500 mPa·s at 180 °C. Viscosity doubles when the addition level is increased from 15 wt% to 25 wt%, a critical threshold for pneumatic application systems. Published data for hot-melt elongation at break in this specific configuration is limited; existing production records indicate that adhesive fiber tear on corrugated board becomes inconsistent when the formulation contains more than 40 wt% of high-melt-index EVA wax.
For injection molding, a barrel reverse profile of 140 °C in the feed zone, 160 °C in the compression zone, and 180 °C in the metering zone prevents premature temperature overshoot; mold temperatures between 10 °C and 30 °C allow demolding without external mold release. Clamp force requirements are typically 4–6 kN/cm² of projected part area. Shrinkage in the flow direction is 1.2–1.6%, while transverse shrinkage remains below 1.0% when packing pressure is held at 60–80 MPa for 8–12 s/mm of wall thickness. Profile extrusion lines with calibrator vacuum of 0.02–0.05 MPa and water bath temperature below 20 °C provide sufficient cooling for wall sections up to 6 mm; thicker sections require internal air cooling to prevent sinks.
ELVAX 3124 occupies a low-VA segment in which crystallite melting point and stiffness remain close to low-density polyethylene. At 9 wt% vinyl acetate, flexural modulus is approximately 80–100 MPa; an 18 wt% vinyl acetate grade of similar melt index typically falls to 35–45 MPa, and a 28 wt% vinyl acetate grade drops below 15 MPa. The corresponding decline in heat deflection under load limits many higher-VA films to continuous service below 55 °C; ELVAX 3124 parts are generally limited to continuous service below 70 °C because oxidative degradation accelerates in the amorphous phase. Seal initiation temperature in cast film is about 95–105 °C for ELVAX 3124, which is 10–15 °C higher than an 18 wt% VA grade. Replacement should be justified only when stiffness, thermal resistance, or solvent resistance outweighs lower seal initiation and reduced compatibility with high-polarity tackifiers. The transition from low-VA to high-VA grades is not linear in adhesion; published peel data show that hot-melt T-peel strength on corona-treated polyethylene rises sharply above 12 wt% VA and plateaus near 18 wt%. For applications requiring low-temperature seal strength below 0 °C, published data for ELVAX 3124 remain limited, and converters should qualify the grade under ASTM F88 seal strength testing rather than extrapolating from higher-VA formulations.
| Property | ELVAX 3124 | EVA 18 wt% VA | EVA 28 wt% VA |
|---|---|---|---|
| Vinyl acetate content | 9 wt% | 18 wt% | 28 wt% |
| Melt flow rate | 2.5 dg/min | 2.5 dg/min | 2.5 dg/min |
| DSC peak melting point | 96 °C | 84 °C | 73 °C |
| Vicat softening temperature | 78 °C | 61 °C | 43 °C |
| Flexural modulus, 1% secant | 80–100 MPa | 35–45 MPa | 10–15 MPa |
| Seal initiation range | 95–105 °C | 80–90 °C | 65–75 °C |
Storage of ELVAX 3124 beyond 24 months from production date does not create automatic failure, but oxidative degradation of the amorphous phase can shift melt flow rate upward by 0.2–0.5 dg/min. Bags should remain sealed below 40 °C and away from direct ultraviolet exposure; the standard grade does not contain UV stabilizer. Manufacturing under ISO 9001 and ISO 14001 does not guarantee performance in medical device applications. Converters must qualify EVA copolymers for USP Class VI or ISO 10993 endpoints on the finished device because polymer suppliers do not provide biological safety certification for raw resin. Deacetylation products generated during processing can corrode unplated carbon steel tooling; stainless steel construction of screws, dies, and barrels is specified for continuous production longer than 500 h.
| Framework | Designation | Relevant condition |
|---|---|---|
| US food contact | 21 CFR 177.1350 | Ethylene-vinyl acetate copolymers; extractive and VA limits apply |
| EU food contact | Regulation (EU) No 10/2011 | Overall migration limit 10 mg/dm² |
| REACH | EC 1907/2006 | No SVHC at 0.1 wt% threshold in published SDS |
| RoHS | Directive 2011/65/EU | Not normally within electrical/electronic scope unless incorporated into EEE components |
