| HS Code | 480831 |
| Vinyl Acetate Content | 12 wt% |
| Melt Flow Index 190 C 2 16kg | 140 g/10min |
| Density | 0.930 g/cm³ |
| Melting Point Dsc | 94°C |
| Crystallization Point Dsc | 58°C |
| Vicat Softening Point A 50 | 72°C |
| Tensile Strength At Break | 12 MPa |
| Elongation At Break | 750% |
| Shore A Hardness | 90 |
| Flexural Modulus | 40 MPa |
| Brittleness Temperature | -70°C |
| Glass Transition Temperature | -30°C |
As an accredited EVAtech EVA 140S/12A Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | EVAtech EVA 140S/12A is packaged in 25 kg laminated paper bags with PE liner for moisture resistance and safe transport. |
| Container Loading (20′ FCL) | EVAtech EVA 140S/12A copolymer packed in bags/pallets, loaded into 20′ FCL, secured and protected from moisture. |
| Shipping | EVAtech EVA 140S/12A is supplied as free-flowing pellets in moisture-proof bags, octabins, or bulk hopper trucks. Ship dry, away from direct heat and ignition sources. Keep containers sealed to prevent moisture absorption and contamination. Non-hazardous, but handle with standard industrial hygiene practices. Avoid prolonged storage above 30°C. |
| Storage | Store EVAtech EVA 140S/12A in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and moisture. Keep in its original, unopened packaging to prevent contamination and degradation. Avoid prolonged storage above 30°C. Ensure the area is clean and separate from oxidizing agents. Use within the manufacturer’s stated shelf life. |
| Shelf Life | Store in a cool, dry place away from direct sunlight. Shelf life is typically two years from date of manufacture. |
In injection-moulded flexible closures and overcaps, EVAtech EVA 140S/12A is processed with a melt-temperature band of 175–210°C. The nominal 14 wt% vinyl acetate content and 12 g/10 min melt flow rate at 190°C/2.16 kg under ISO 1133-1:2022 lower fill pressure in multi-cavity tools, but the same flow level increases post-mould shrinkage anisotropy. On 40 mm diameter, 20:1 L/D reciprocating screws, typical barrel settings are rear 150–160°C, centre 170–185°C, front 190–200°C and nozzle 195–205°C; cavity surfaces are held at 20–35°C. Dimensional checks are referenced to ISO 294-4 after 24 h; unfilled plaques in this VA class generally show flow-direction shrinkage below 1.2% and transverse shrinkage below 1.4%, though multi-gate weld lines must be tested separately under ASTM D638-14 because local elongation loss is not visible in as-moulded parts. Pre-drying at 70°C for 3–4 h is enforced when storage relative humidity exceeds 60%; moisture above 0.05 wt% produces surface splay and depresses weld-line tensile strength. This grade is not selected for clarity-critical thin-wall containers because the 14 wt% VA comonomer retains enough crystallinity to produce translucency; it is replaced with VA levels above 18 wt% only when cold-flexural cracking below −30°C is not specified.
Chemically foamed sheet and midsole compounds based on this grade operate inside a narrow temperature corridor bounded by the 1 h half-life temperature of dicumyl peroxide, commonly reported near 135–140°C, and the exothermic decomposition onset of azodicarbonamide in EVA, which begins near 195–205°C. A two-stage compression-moulding cycle is used: the first plateau at 150–160°C under 15 MPa for 6–8 min permits DCP to initiate crosslinking before the blowing agent releases the bulk of its gas, and the second plateau at 170–180°C for 3–5 min stabilises the cellular structure. A first-stage deviation above ±5°C produces undercured preforms that collapse after demoulding or over-blown cells that tear at sheet edges. Indicative starting compounds contain 0.7–1.0 phr DCP, 2.5–4.0 phr ADC, 0.5–1.0 phr zinc oxide and 0.3–0.5 phr stearic acid; calcium carbonate filler is held below 10 phr when tear resistance is specified under ASTM D624-00 because higher filler loadings nucleate irregular cell walls. The 14 wt% VA comonomer generates lower melt elasticity than 28 wt% VA encapsulant grades, so the second-stage gas release uses a decompression ramp of 60–90 s rather than abrupt platen opening to avoid blow-hole defects. Foam densities in this process band typically settle between 0.12 g/cm³ and 0.25 g/cm³; compression set after 24 h at 50% strain under ASTM D395-16 remains below 65% only when gel content exceeds 60% by 24 h xylene extraction. Aminic antioxidants are excluded because they quench DCP decomposition and reduce final crosslink density.
Halogen-free flame-retardant cable compounds with aluminium trihydrate loads of 60–65 wt% invert the processing advantage of the 12 g/10 min flow index and make melt-pressure control the key boundary. A co-rotating twin-screw extruder with 44:1 L/D and 11 barrel zones is run at screw speeds of 250–350 min⁻¹; zones 2–6 are held at 140–160°C to keep ATH below its 180–200°C dehydration onset, while the final mixing zone and die are held at 165–170°C. Die-face melt temperature is held below 170°C; excursions beyond 180°C release structural water from ATH and create micro-voids detectable in 0.76 mm wire samples. The 14 wt% vinyl acetate side groups improve filler wetting relative to LLDPE homopolymer but reduce thermal stability under extended residence time, so the grade is specified at 20–30 wt% of the polymer phase in an EVA/LLDPE blend at elevated ATH loadings. Limiting oxygen index is evaluated under ISO 4589-2, and tensile properties under IEC 60811-501; tensile strength falls below 10 MPa unless 10–15 wt% LLDPE or maleated PE is added to recover interfacial strength. Above 65 wt% ATH, melt-pressure fluctuation across a 48/80 mesh screen pack exceeds ±0.8 MPa, producing wall-thickness variation, so the grade is not used as the sole polymer at higher filler loads.
For additive and colour concentrates, the grade functions as a high-flow carrier where low head pressure after dispersion is required. On a 25 mm twin-screw extruder with 60:1 L/D and downstream side feed, the carrier is introduced in the main throat at 40–60 wt%, with pigment or stabiliser payloads of 20–30 wt% added after the first kneading block; barrel temperatures are kept at 120–150°C and screw speed at 300 min⁻¹, holding torque below 65% of rated motor load. Batch-to-batch melt-flow checks under ISO 1133-1:2022 are critical: a shift from 12 g/10 min to 9 g/10 min raises filtration pressure on a 300-mesh screen pack by approximately 15%, causing letdown rejection at 4–5% addition ratios. The carrier is not recommended for additive systems containing free amines or strong bases because such species accelerate acetate ester hydrolysis at processing temperatures and reduce strand pellet hardness after water-bath cooling.
In extrusion-coated lidding and flexible packaging structures, the copolymer is dry-blended with LDPE or LLDPE at 15–25 wt% to lower seal initiation temperature. The blend is processed on a single-screw extruder with 30:1 L/D and a 100–150 µm coating die gap at melt temperatures of 220–240°C; the lower melting point of the EVA phase depresses the seal-bar setting by 5–10°C relative to pure LDPE. Seal strength is measured under ASTM F88/F88M-21 after 0.5 s dwell at 0.3 MPa jaw pressure. The blend is not used in direct-contact high-acid packaging without a barrier layer because acetate ester migration into polar fillings may exceed organoleptic thresholds under EU 10/2011 when the EVA fraction exceeds 25 wt% and the layer thickness exceeds 40 µm.
In adhesive tie-layer compounds applied between aluminium foil and polyethylene film, the 14 wt% vinyl acetate content provides limited but measurable peel-lap shear improvement over homopolymer PE, while the 12 g/10 min flow index permits slot-die coating at 140–160°C. Compounding with tackifier resins such as rosin ester or C5 hydrocarbon resin is conducted at 10–20 phr; above this range the compound softens excessively and block point drops below 45°C on a gradient hot-block tester. Peel strength is assessed under ASTM D1876-08 on 25 mm wide aluminium/polyethylene laminates; values are typically lower than those obtained with 18–28 wt% VA copolymers, so this grade is specified only where lower seal stiffness or lower cost is more important than maximum metal adhesion. The compound is dried to 0.03 wt% moisture before coating; undried resin at 140–160°C generates microfoam at the aluminium interface and reduces peel strength. Amine-containing adhesion promoters are avoided because they accelerate ester degradation and reduce melt stability over an 8 h coating campaign.
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The EVAtech EVA 140S/12A Ethylene Vinyl Acetate Copolymer is a pelletised ethylene-vinyl acetate copolymer with a nominal vinyl acetate content of 12 wt% and a nominal melt flow index of 14 g/10 min at 190 °C/2.16 kg according to ASTM D1238/ISO 1133-1:2022. The grade occupies the low-to-medium vinyl acetate segment of the EVA family and is positioned between linear low-density polyethylene and higher-VA flexible EVA copolymers in stiffness, melting range, polarity, and heat-seal response. It is specified for injection moulding of closures, gaskets, soft-touch grips, appliance feet, automotive interior trim, extrusion of hose and tube profiles, blown film, and foam intermediates. Because the acetate side groups reduce crystallinity but do not eliminate the polyethylene crystalline network, the resin exhibits a defined yield point, moderate toughness, and compatibility with polyolefin reclaim streams. The following technical description provides representative data for initial screening; actual release limits are defined by the supplier’s certificate of analysis and should govern production qualification.
Published data for this specific configuration are limited; the values in Table 1 are representative for a 12 wt% vinyl acetate, 14 g/10 min melt-flow EVA copolymer and are not a sales specification.
| Property | Test method | Representative value |
| Vinyl acetate content | ASTM D5594 FTIR | 12 wt% |
| Melt flow index | ASTM D1238/ISO 1133-1:2022, 190 °C/2.16 kg | 14 g/10 min |
| Density | ASTM D1505/ISO 1183-1:2019 | 0.935 g/cm3 |
| Tensile stress at break | ASTM D638 Type IV, 50 mm/min | 12–14 MPa |
| Elongation at break | ASTM D638 | 650–750% |
| Flexural modulus | ASTM D790 Method I | 60–90 MPa |
| Hardness | ASTM D2240 Shore D | 40–45 |
| Vicat softening point | ASTM D1525 A/10 N | 72–78 °C |
| Peak melting temperature | ASTM D3418 differential scanning calorimetry | 90–94 °C |
The polar vinyl acetate comonomer interrupts regular polyethylene chain packing. Differential scanning calorimetry per ASTM D3418 shows a single endothermic melt peak in the 90–94 °C range, compared with approximately 105–115 °C for a low-density polyethylene of comparable melt flow. The reduced melting point is accompanied by a reduction in percent crystallinity to roughly 30–35%, calculated from a reference heat of fusion of 293 J/g for 100% crystalline polyethylene. This crystallinity level remains high enough to produce a defined yield point and practical solid-state creep resistance, but low enough to reduce room-temperature flexural modulus to a representative range of 60–90 MPa under ASTM D790.
Tensile behaviour is characterised by ISO 527-2:2012 or ASTM D638. The material typically exhibits yield stress between 6 MPa and 8 MPa and tensile stress at break in the 12–14 MPa range, with elongation at break above 650%. The high strain at break reflects both the low crystallinity and a reasonably uniform acetate distribution; however, at extension rates above 500 mm/min, the remaining crystalline network produces necking and stress whitening. Hardness values of 40–45 Shore D measured by ASTM D2240 are approximately 5–10 points lower than a typical LDPE homopolymer and 8–12 points higher than an 18 wt% VA EVA of similar melt flow. These differences allow substitution decisions to be made from Shore D and Vicat data without iterative mechanical testing.
At 190 °C, the melt flow index of 14 g/10 min places the material in the medium-fluidity range. Capillary rheometry under ISO 11443:2021 shows shear-thinning behaviour with apparent viscosity declining from approximately 600 Pa·s at 100 s-1 to below 200 Pa·s at 1,000 s-1. The resin is run on single-screw extruders with a barrier screw and length/diameter ratio of 24:1 to 30:1 at barrel temperatures from 140 °C in the feed zone to 180 °C at the metering zone. Twin-screw compounding lines with L/D 40:1 and side-stuffing ports are used for high-filler formulations; in those operations, melt temperatures above 200 °C at the die should be avoided unless residence time is actively controlled.
Thermal degradation proceeds primarily through deacetylation, releasing acetic acid. Thermogravimetric analysis in nitrogen at 10 °C/min typically records initial mass loss above 200 °C and a deacetylation mass loss step centred at 340–360 °C; however, measurable acetic acid evolution begins at lower temperatures in melt processing when residence time exceeds 15 min. For this reason, melt temperature is normally limited to 220 °C. Runs longer than 30 min require corrosion-resistant barrel and liner materials, local exhaust ventilation, and purging with a low-melt-index polyethylene before shutdown. Acid scavengers such as zinc stearate or calcium stearate are used at 0.1–0.3 phr in compounds exposed to repeated heat cycles.
In injection moulding operations, the grade is processed on reciprocating-screw machines with clamp force calculated from projected area at 3–5 kN/cm². Typical melt temperature is 170–190 °C, with mould temperature controlled at 20–40 °C for thin-wall articles; higher mould temperatures up to 60 °C may be used to reduce flow marks but extend cycle time by 10–20%. Observed manufacturing defects include gate blush at injection speeds above 300 mm/s, sink marks at packing pressures below 40 MPa, and surface splay caused by moisture contents above 0.05 wt%. Drying in a desiccant dryer at 70 °C for 2–4 h to a dew point of -40 °C reduces splay in high-humidity environments. For foamed components, chemical blowing agents based on azodicarbonamide are dosed at 0.5–1.5 wt% and require melt temperature no higher than 190 °C to prevent premature gas release; the resin can also be crosslinked with dicumyl peroxide at 0.8–1.2 phr when a cured foam network is required.
Compared with an LDPE of equivalent 14 g/10 min melt flow, EVA 140S/12A shifts the seal initiation temperature downward by approximately 10–20 °C and improves adhesion to polar substrates such as polyurethane, polycarbonate, and aluminium. The trade-off is a reduction in stiffness and an increase in surface tack. Where a stiff snap-fit geometry is required, LDPE retains a higher flexural modulus; where low-temperature impact and puncture resistance govern, the 12 wt% VA grade is preferred. The lower crystallinity also reduces heat distortion temperature under 0.45 MPa load from approximately 45–55 °C for LDPE to 35–42 °C for this EVA, so service temperatures in load-bearing thermoplastic parts should not exceed 40 °C continuously.
Against an 18 wt% VA EVA of similar melt-flow index, EVA 140S/12A exhibits higher Shore D hardness, higher Vicat softening point, and lower tack. It also has lower solubility in chlorinated solvents and reduced water vapour permeability; however, it cannot match the optical clarity and low-temperature flexibility of the higher-VA grade. The 12 wt% VA composition is typically selected for injection-moulded articles that must survive demoulding without deformation, for cap liners that require stiffness, and for blends with LLDPE where downstream extrusion stability is a priority. In applications requiring softness below Shore A 85 or heat-seal strength above 10 N/15 mm on polyethylene film, higher-VA copolymers or ionomers should be evaluated.
Table 2 provides a representative comparison for grades of approximately 14 g/10 min melt flow; actual values vary by supplier and should be confirmed by grade-specific technical data sheets.
| Property | LDPE, 14 g/10 min | EVA 140S/12A | EVA 18 wt% VA, similar MFI |
| Vinyl acetate content | 0 wt% | 12 wt% | 18 wt% |
| Shore D hardness | 50–55 | 40–45 | 30–35 |
| Vicat softening point | 90–100 °C | 72–78 °C | 55–62 °C |
| Flexural modulus | 180–250 MPa | 60–90 MPa | 15–25 MPa |
| Seal initiation temperature | 110–120 °C | 90–100 °C | 70–80 °C |
| Low-temperature brittleness | ASTM D746 < -70 °C | ASTM D746 < -70 °C | ASTM D746 < -70 °C |
For food-contact applications, FDA 21 CFR 177.1350 and EU Regulation (EU) No 10/2011 require migration testing on the finished article rather than resin certification alone. Vinyl acetate monomer specific migration is measured according to EN 13130-1:2004 and overall migration according to EN 1186-1:2002. Industrial compliance verifications for heavy metals and brominated flame retardants are typically performed by RoHS Directive 2011/65/EU analytical methods such as EN 62321-5:2014 for lead and cadmium and EN 62321-6:2015 for polybrominated biphenyls. REACH registration status should be confirmed through the supplier’s safety data sheet.
Operational boundaries include continuous service temperature below 40 °C for load-bearing parts, no direct flame exposure, and avoidance of prolonged melt hold times above 220 °C. The resin is incompatible with strong oxidising acids, chlorinated solvents at elevated temperature, and primary aromatic amines; those materials promote swelling, deacetylation, or radical attack. Outdoor weathering requires carbon black or hindered amine light stabiliser packages; unstabilised resin undergoes rapid carbonyl index increase within 500 h in QUV ASTM G154 cycles.
