| HS Code | 982029 |
| Vinyl Acetate Content | 18% |
| Melt Flow Index | 20 g/10 min (190°C, 2.16 kg) |
| Density | 0.938 g/cm³ |
| Melting Point | 85°C |
| Vicat Softening Point | 65°C |
| Tensile Strength | 14 MPa |
| Elongation At Break | 800% |
| Hardness | 90 Shore A |
| Flexural Modulus | 45 MPa |
| Brittleness Temperature | -80°C |
| Glass Transition Temperature | -50°C |
As an accredited Ateva 1820 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Ateva 1820 Ethylene Vinyl Acetate Copolymer is supplied as pellets in 25 kg multi-wall paper bags, sealed for safe transport and storage. |
| Container Loading (20′ FCL) | 20′ FCL: Ateva 1820 EVA copolymer loaded in 25kg bags, palletized and secured, maximizing container capacity. |
| Shipping | Ateva 1820 EVA copolymer ships as non-hazardous pellets in moisture-protective bags, gaylords, or bulk containers. Store away from heat, ignition sources, and direct sunlight. Keep dry to prevent clumping. No special transport classification required, but standard handling and ventilation apply. Ensure packaging integrity during transit. |
| Storage | Store Ateva 1820 Ethylene Vinyl Acetate Copolymer in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and ignition sources. Keep containers tightly sealed to prevent moisture contamination and physical damage. Avoid stacking excessively. Under proper storage conditions, shelf life is typically extended; use within manufacturer-recommended timeframe. Ensure area is clean and spill-free. |
| Shelf Life | Ateva 1820 EVA copolymer has a two-year shelf life when stored unopened in cool, dry conditions. |
Within coextruded flexible packaging lines, the heat-seal initiation temperature of an EVA sealant layer is governed by melting of the ethylene crystallites and the free volume contributed by the 18 wt% vinyl acetate side groups. Ateva 1820 is typically blended with LLDPE or LDPE in the sealant web at an addition ratio of 60–100 wt% EVA in the sealant resin fraction; the remainder may be an ethylene-butene LLDPE with density 0.918 g/cm³ added to raise hot-tack strength. In three-layer structures, the sealant layer is coextruded at 15–30 µm thickness between the product contact side and a tie layer, with extrusion temperatures limited to 200–220 °C at the die and a reverse temperature profile to avoid resin degradation. The downstream conversion process is blown film or cast film coextrusion followed by form-fill-seal packaging on horizontal or vertical machines. On packaging lines, the sealant layer displays a seal initiation range of 85–105 °C under ASTM F2029-16 conditions of 0.28 MPa seal pressure and 0.5 s dwell, depending on film gauge and blending ratio; lower addition ratios of Ateva 1820 move the seal initiation upward, while 100% EVA seals at the lower end. Compliance for direct food contact requires the fully formulated film to meet FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers and, in the EU, Regulation EU No 10/2011 with an overall migration limit of 10 mg/dm²; specific migration of vinyl acetate monomer must be verified under intended time-temperature conditions because residual monomer is a function of polymerisation and degassing efficiency. Terminal products include frozen food pouches, liquid detergent stick-packs, shredded cheese packaging, and medical device overwrap where additional ISO 11607-1:2019 seal integrity validation is completed by the converter.
Co-rotating twin-screw compounding lines with length-to-diameter ratios from 44:1 to 52:1 and screw diameters from 35 mm to 75 mm use Ateva 1820 as a carrier resin for pigment, additive, and filler concentrates that are subsequently diluted into polyethylene and EVA-based extrusion or injection moulding processes. The addition ratio in the masterbatch formulation is governed by the targeted loading: for 30–50 wt% pigment concentrates, Ateva 1820 comprises 50–70 wt% of the batch, with the balance consisting of dispersing waxes and the active pigment or additive; for 70–80 wt% calcium carbonate or talc concentrates, the carrier fraction falls to 20–30 wt%. The lower crystallinity of the 18 wt% vinyl acetate comonomer contributes to wetting of the pigment surface and permits lower melt temperatures in the side-fed section, typically 130–160 °C, which is critical for heat-sensitive organic pigments. Production-scale lines feed the majority of the mineral or pigment via a side-stuffer located at 16D–20D from the main feed throat to preserve screw fill and to avoid surging; vacuum devolatilisation at -0.08 MPa to -0.09 MPa removes low-molecular-weight volatiles trapped by the EVA melt. The concentrate is pelletised through a water-ring or underwater pelletiser with die-face temperatures kept below 180 °C to prevent resin yellowing and acetic acid release. Regulatory compliance for colourants and additives in food-contact packaging is not determined by the carrier alone but by the complete masterbatch under EU No 10/2011 and FDA 21 CFR 174.5 for indirect additives; a certificate of composition and migration testing on the final packaging article are required. Terminal downstream articles include coloured polyethylene film, injection-moulded caps and closures, EVA foam, and polyolefin pipe.
The principal standard references across these conversion sectors are consolidated below.
| Conversion sector | Standard or regulation | Test method or clause | Measured parameter |
|---|---|---|---|
| Flexible packaging sealant | FDA 21 CFR 177.1350 | EVA copolymer food-contact limitations | Food-contact suitability |
| Flexible packaging sealant | EU No 10/2011 | Annex II migration testing | Overall migration ≤ 10 mg/dm² |
| Injection-moulded footwear foam | ASTM D3575-20 | Closed-cell polyolefin foam test methods | Density, compression set, tensile |
| Resin incoming control | ISO 1133-1:2022 | Condition 190 °C/2.16 kg | Melt mass-flow rate 2.0 g/10 min |
| Hot-melt adhesives | ASTM D3236-15 | Brookfield Thermosel | Viscosity at 180 °C |
| Halogen-free cable jacket | IEC 60754-2 | Combustion gas pH and conductivity | pH ≥ 4.3, conductivity ≤ 10 μS/mm |
Flame-retardant cable jacketing compounds based on EVA/LLDPE blends utilise the vinyl acetate fraction as a char-forming carbon source and as a compatibility bridge for high loadings of magnesium hydroxide or aluminium trihydrate. Ateva 1820 is typically incorporated at 30–50 wt% of the polymer fraction, with the remainder being LLDPE or maleic anhydride-grafted polyethylene; the total polymer fraction usually represents 35–45 wt% of the compound, while halogen-free mineral flame retardants account for 50–60 wt%, supplemented by 1–2 wt% processing aids, 0.2–0.5 wt% antioxidants, and 0.5–2.0 wt% zinc borate or organoclay synergists. Mixing is conducted in an internal mixer at a final melt temperature of 150–170 °C or in a co-rotating twin-screw extruder with length-to-diameter ratio of 44:1–52:1 and downstream side-feeding of the mineral filler to avoid excessive shear heating. The resulting compound is pelletised and then extruded as a jacket onto insulated conductors in a single-screw extruder with a temperature profile of 140–190 °C, a low-compression screw with a compression ratio of 2.0:1–2.5:1, and a pressure screen pack to trap agglomerates. Halogen-free performance is tested according to IEC 60754-1 for halogen acid gas content and IEC 60754-2 for combustion gas pH and conductivity, typically requiring pH ≥ 4.3 and conductivity ≤ 10 μS/mm, with smoke density evaluated under IEC 61034-2; flame spread is assessed by IEC 60332-1 or IEC 60332-3 depending on cable construction. Crosslinking of the jacket may be carried out by electron beam irradiation at 60–150 kGy to improve hot-set performance, but uncrosslinked EVA/LLDPE jackets based on Ateva 1820 are generally limited to service temperatures not exceeding 70 °C under continuous load. Terminal products include low-voltage control cable sheathing, building wire insulation, and halogen-free data cable jackets where local building codes require low-smoke, zero-halogen materials.
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Ateva 1820 ethylene vinyl acetate copolymer is a pelletized thermoplastic resin with a nominal vinyl acetate content of 18% by weight and a melt mass-flow rate of 2.0 g/10 min at 190 °C under 2.16 kg load, as measured by ISO 1133-1:2022. The resin has a density of approximately 0.937 g/cm³ by ISO 1183-1:2019 and a peak melting endotherm near 84 °C by ISO 11357-3:2018. These nominal values place Ateva 1820 between low-VA polyolefins and higher-VA adhesive resins. The 18% VA insertion lowers crystalline ordering relative to LDPE, increases polarity, reduces heat seal initiation temperature, and imparts low-temperature flexibility. At the same time, the polymer retains sufficient crystallinity to limit blocking and surface tack during pellet storage and final article use. Applications include hot-melt adhesive bases, polyolefin modification, extrusion coating, and carrier resin for masterbatch additives.
In compounding, Ateva 1820 is processed on single-screw extruders with 24:1 to 30:1 L/D ratios and on co-rotating twin-screw extruders up to 40:1 L/D. Barrel set points are typically maintained between 150 °C and 180 °C, with melt temperature held below 200 °C. Pellet feed systems should avoid hopper temperatures above 40 °C because surface tack increases and can lead to feed throat bridging. Water-cooled hopper throats are used when ambient temperature exceeds 25 °C. For filled systems, side-feeding of mineral fillers after the polymer melting zone is preferred to minimize screw torque excursions and melt temperature overshoot. Screw speed and specific energy input are set by compound formulation; data from line instrumentation should be used to avoid melt temperatures above 200 °C.
Thermal degradation of Ateva 1820 is dominated by acetic acid elimination from the vinyl acetate units. Deacetylation accelerates at melt temperatures above 200 °C, producing acetic acid, unsaturation, and viscosity changes that can appear as odor and yellowing in cast film or adhesive coatings. In vented compounding, vacuum at the vent port is maintained at 0.08 MPa to 0.09 MPa partial vacuum to remove acetic acid and moisture. The melt residence time at temperatures above 190 °C should not exceed 15–20 min. If regrind is used, the total recycle fraction should be limited to 20% by weight to restrict cumulative heat history. Pre-drying is required after storage at relative humidity above 60%. Desiccant drying at 50–60 °C for 4 h typically lowers pellet moisture below 0.05% by weight. The resin should not be compounded with zinc oxide or amine-based additives under high-temperature conditions because both accelerate deacetylation. Phenolic stabilizers present in the grade do not prevent acetic acid formation; they inhibit oxidative chain scission and gel formation.
Adhesion performance for Ateva 1820-based hot melts is measured under ASTM D1876 T-peel conditions at 23 °C and 50% RH. Because neat EVA is not a pressure-sensitive adhesive, peel force values are formulation-specific and depend on tackifier type, loading, and coating thickness. In common formulations containing 20–40 wt% rosin ester or hydrogenated hydrocarbon tackifier, clear melt blends are obtained at 180 °C. The 18% VA content supplies an amorphous phase for tackifier compatibility, while the crystalline phase reduces cold flow and blocking. On corona-treated polyethylene terephthalate, failure mode shifts from adhesive to cohesive when tackifier loading is optimized; published data for a single universal peel value is limited because substrate surface energy and drawdown coating weight dominate. For paperboard packaging, fiber-tearing bonds are achievable when open time and compression dwell are matched to the specific adhesive formulation rather than to the EVA grade alone.
The 2.0 g/10 min melt flow rate provides a moderate viscosity suitable for both extrusion and injection molding. In extrusion coating, die temperatures from 180 °C to 200 °C are typical, with rear barrel zones between 150 °C and 180 °C. Melt temperature measured at the die should not exceed 200 °C for continuous runs exceeding 2 h because acetic acid evolution increases. Neck-in behavior is controlled by die-to-substrate distance, melt temperature, and draw ratio; no quantitative neck-in value can be assigned without specifying these variables. For blown film, blow-up ratios of 1.5:1 to 3:1 are used depending on gauge and bubble stability, but the resin is more commonly used in cast processes. In injection molding, melt temperatures of 160–190 °C and mold temperatures of 20–40 °C are standard for parts that require soft-touch surfaces or gasketing behavior. Flow path length-to-wall-thickness ratios above 200:1 may require higher melt temperature or increased packing pressure, but the higher MFR of Ateva 1820 relative to lower-MI EVA grades reduces fill pressure under identical tooling conditions.
| Property | Test method | Typical value |
|---|---|---|
| Vinyl acetate content | ASTM D5594-18 | 18% by weight |
| Melt mass-flow rate | ISO 1133-1:2022 | 2.0 g/10 min at 190 °C/2.16 kg |
| Density | ISO 1183-1:2019 | 0.937 g/cm³ |
| Peak melting endotherm | ISO 11357-3:2018 | 82–86 °C |
Substituting Ateva 1820 for a 28% VA copolymer reduces amorphous phase content, raises crystallization temperature, and lowers ambient surface tack. The change can improve handling of coated or pelletized adhesives but reduces low-temperature flex and may require higher tackifier loadings to restore open time. In a direct substitution, melt mixing temperature may need to increase by 5–10 °C because the melting point of 18% VA EVA is higher than that of 28% VA grades. Adhesion to untreated polypropylene is generally lower with 18% VA than with 28% VA because polar contribution to surface energy is smaller. Conversely, Ateva 1820 has better dimensional stability at 40–50 °C storage and less blocking in stacked films. Compared with a lower-MI grade of the same 18% VA family, Ateva 1820 imparts lower melt pressure and allows higher line speed in thin-coating applications, but may show slightly more neck-in and less melt strength in vertical draw processes. The final selection should be based on melt flow rate, VA content, and specific end-use requirements verified under ASTM D1876 or ISO 527-3 for films.
In film applications, heat seal initiation temperature is generally lower than that of LDPE by approximately 15–20 °C because of the VA groups. Seal strength is evaluated by ASTM F88/F88M or ISO 527-3 on sealed specimens; actual values vary with film gauge and seal dwell. The difference from acid copolymers is also measurable: Ateva 1820 has lower metal adhesion and is less corrosive to equipment, but it cannot match the high-peel metal bonding of ethylene acrylic acid systems. In polymer modification, Ateva 1820 is dry-blended with polyolefins at 10–30 wt% for toughness and adhesion; the mixture is then compounded at 180 °C rather than pelletized by cold blending alone.
Regulatory status for Ateva 1820 must be evaluated against the final compounded formulation, because additives and colorants can alter extractives behavior and food-contact compliance. The base EVA polymer falls within the class of ethylene-vinyl acetate copolymers described in FDA 21 CFR 177.1350 and may be used in food-contact applications subject to extractable fraction limits specified in that section. For European Union applications, the polymer is assessed under EU Regulation 10/2011 for plastic materials intended to come into contact with food; specific migration limits are formulation-dependent. REACH registration obligations apply to the monomer substances used in polymerization under Regulation (EC) 1907/2006. The resin does not contain intentionally added cadmium, lead, mercury, or hexavalent chromium above the maximum concentration values of RoHS Directive 2011/65/EU; however, finished article certification is required to confirm compliance across the entire bill of materials.
| Standard or regulation | Boundary condition |
|---|---|
| FDA 21 CFR 177.1350 | EVA copolymers permitted for food contact; final formulation must meet extractives limit. |
| EU Regulation 10/2011 | Compliance assessed through specific migration testing of final article. |
| REACH (EC) 1907/2006 | Monomer registration applies. |
| RoHS Directive 2011/65/EU | No intentional restricted heavy metals above MCV in base resin; final article certification required. |
On production lines, lot-to-lot MFR variation is normally controlled within ±0.2 g/10 min relative to the nominal value in the certificate of analysis. This variation can shift injection fill time by approximately 2–5% in thin-walled tooling, so mold-fill monitoring is used to detect changes in melt viscosity. If pellet moisture is not controlled, surface defects in extruded profiles and bubbles in adhesive films can occur. Hopper magnets and 80 mesh screen packs are used downstream to capture contaminants because EVA melts are more corrosive to equipment than polyolefins when acetic acid is present; chrome-plated screws and barrels are recommended for extended campaigns. Processing equipment should be purged with LDPE or a commercial purging compound when switching from Ateva 1820 to polycarbonate or nylon, as residual EVA can degrade and form carbonaceous deposits. Published data for long-run equipment wear with this specific grade is limited, but the combination of acetic acid vapor and high-shear zones may increase surface wear on unplated nitrided steel screws in continuous operation.
