| HS Code | 102846 |
| Vinyl Acetate Content | 7-9 wt% |
| Density | 0.93 g/cm³ |
| Melt Flow Index 190 C 2 16 Kg | 2-4 g/10 min |
| Melting Point | 95-105 °C |
| Vicat Softening Point | 70-80 °C |
| Tensile Strength At Break | 16-22 MPa |
| Elongation At Break | 600-800% |
| Flexural Modulus | 80-120 MPa |
| Shore Hardness D | 40-50 |
| Brittleness Temperature | -70 to -60 °C |
As an accredited Celanese Vinyl Acetate EVA Grade HQ 7-9 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg polyethylene-lined paper bags, palletized and shrink-wrapped, with clear labeling for safe handling and storage. |
| Container Loading (20′ FCL) | Load 20′ FCL with palletized, sealed drums; secure tightly; ventilate; avoid contaminants, heat, and oxidizers per safety data sheet. |
| Shipping | Celanese Vinyl Acetate EVA Grade HQ 7-9 ships in stainless steel tank containers, isotanks, or lined drums under nitrogen blanketing. It requires moisture-free, temperature-controlled conditions to prevent polymerization. Handle as a flammable liquid with proper grounding, ventilation, and emergency spill containment. Ensure compatibility with gaskets and seals, and follow all hazardous material regulations. |
| Storage | Store in tightly sealed, approved containers in a cool, dry, well-ventilated area away from heat, sparks, open flames, direct sunlight, oxidizers, and acids. Maintain the hydroquinone inhibitor level (7–9 ppm) and avoid oxygen starvation; do not store under inert gas. Keep at or below 20°C and check for polymerization or degradation before use. |
| Shelf Life | Store in original unopened container, away from heat and moisture. Shelf life is 12 months from date of manufacture. |
Extrusion coating of unprimed bleached kraft paperboard with Celanese Vinyl Acetate EVA Grade HQ 7-9, an ethylene–vinyl acetate copolymer with nominal vinyl acetate monomer content of 7–9 wt%, is performed at die exit melt temperatures between 240°C and 275°C on single-screw extruders with barrier screws and L/D ≥ 24:1. The comonomer suppresses crystallinity relative to LDPE, lowering the peak melting endotherm to approximately 95–102°C under ISO 11357-3; this permits heat-seal initiation below 90°C in laminates tested to ASTM F88. In production-scale coating, peel adhesion to unprimed board becomes fibre-tear limited when coating weight exceeds 14–16 g/m², while coating weights below 10 g/m² produce pinhole densities that compromise liquid packaging barrier performance. Lines using 90 mm barrier screws with 30:1 L/D report neck-in and edge-bead formation that requires deckle retraction once line speed exceeds 180 m/min; the air gap is normally held between 150 mm and 200 mm to retain adhesion and gloss. Melt pressure at the die entrance is commonly maintained between 150 bar and 250 bar to avoid surging and transverse gauge bands. Chill roll temperature is set at 10–18°C to prevent blocking and preserve subsequent heat-seal response. Food-contact compliance is governed by FDA 21 CFR 177.1350 for EVA copolymers and by EU Regulation 10/2011, Annex I, with vinyl acetate monomer migration limited to 12 mg/kg food simulant. The operational ceiling is 300°C; above this melt temperature, vinyl acetate side groups undergo deacetylation and release acetic acid, causing corrosion on downstream metal surfaces, odour transfer, and bond degradation. Published data for this exact Celanese HQ 7-9 configuration in high-speed paperboard coating is limited, so die lip gap, back pressure, and deckle settings should be derived from the grade technical data sheet before production runs.
| Checkpoint | Standard / method | Acceptance window |
|---|---|---|
| EVA copolymer food-contact compliance | FDA 21 CFR 177.1350 | Extraction limits depend on food type and sheet thickness |
| Vinyl acetate specific migration | EU 10/2011, Annex I | 12 mg/kg maximum |
| Melt flow rate control | ISO 1133-1:2022 | Target window per grade technical data sheet |
| Heat-seal strength | ASTM F88 | Application-specific; frozen food lidding typically above 8 N/15 mm |
| Coating adhesion to paperboard | ASTM F904-16 | Fibre-tear preferred at 14–16 g/m² |
| Dart impact of film | ASTM D1709-16a | Method A or B based on nominal film gauge |
During cast film converting of HQ 7-9 at a vinyl acetate level of 7–9 wt%, the stable operating window is constrained primarily by draw resonance onset, which appears when the melt is reduced from a die gap of 0.8–1.0 mm to a final thickness of 25–35 μm at draw ratios above 25:1. The vinyl acetate unit lowers zero-shear viscosity and weakens extensional strain hardening relative to LDPE, lowering the critical draw ratio; on a 75 mm single-screw extruder with 25:1 L/D, stable casting is maintained when melt temperature at the feedblock is held at 220–235°C and web tension is kept below 8 N per linear metre width. Frozen-food lidding requires heat-seal initiation below 85°C against polypropylene trays, but a low-VA EVA seal layer at 10–15% of total thickness is normally coextruded with a higher-melt-strength surface skin to reduce edge weave; without this, gauge variation exceeds ±5% in 30 μm film and seal strength measured by ASTM F88 becomes erratic. Dart impact of 50 μm film tested by ASTM D1709-16a is typically reported at 180–220 g, while Elmendorf tear in the machine direction per ASTM D1922-15 falls below 200 g when die lip gap is narrower than 1.2 mm. Pre-drying at 60–70°C for 2 h is required when ambient relative humidity exceeds 60%; otherwise hydrolysis of vinyl acetate groups during extrusion generates acetic acid, which contributes to chill roll corrosion and film fogging. Edge bead thickness above 5% of nominal gauge increases blocking during rewinding, so vacuum edge removal is required above 150 m/min line speed.
For polyolefin masterbatch carrier applications, Celanese Vinyl Acetate EVA Grade HQ 7-9 is compounded on a co-rotating twin-screw extruder with L/D 40:1 and distributive mixing elements placed in the final third of the screw to limit shear history. The low melting range of 95–102°C reduces pigment thermal exposure and permits carbon black loadings of 40–50 wt% without excessive torque in the feed zone. The 7–9 wt% vinyl acetate segment improves wetting of polar organic pigments and certain hindered amine light stabilizer systems that do not disperse readily in LDPE or LLDPE carriers; however, melt temperature must not exceed 220°C when hygroscopic fillers are present above 30 wt%, because liberated acetic acid raises melt acidity and can catalyse decomposition of azo pigment systems. In post-consumer LLDPE recycling, addition of 5–15 wt% HQ 7-9 recovers dart impact and tear resistance in regenerated film without shifting the material outside polyolefin recycling streams. The softening point of the blend falls by approximately 1–2°C per 1 wt% vinyl acetate added, which narrows the sealing plateau and must be characterized by ISO 11357-3 before the final film enters food packaging.
Thermoformed rigid lidstock and twin-sheet packaging use HQ 7-9 as a coextruded sealant skin at 8–15% of total sheet gauge, with total sheet thickness between 250 μm and 600 μm. The low-VA EVA skin provides destruct seals to polypropylene trays at jaw temperatures of 110–125°C and dwell times below 1.5 s; seal strength tested by ASTM F88 remains above 8 N/15 mm for refrigerated dairy packaging. Thermoforming lines operating with 50–80°C mould temperatures report that acetic acid by-products from deacetylation accumulate on forming surfaces after 8–10 h of continuous production, making periodic mould cleaning necessary; the interval is extended when melt temperature is held below 220°C. The material is not suitable for hot-fill lidding above 85°C because seal creep rupture under a 250 g top load is observed within 24 h; polypropylene-based sealant resins are specified instead. Food-contact compliance requires migration testing under EU Regulation 10/2011, Annex I, with vinyl acetate monomer migration below 12 mg/kg in the intended food simulant, and extraction limits under FDA 21 CFR 177.1350 depend on final sheet thickness and food type.
For aluminium foil-to-polyolefin lamination in retortable stand-up pouches, HQ 7-9 is applied only when retort temperature does not exceed 100°C, because the vinyl acetate side group hydrolyses in high-moisture retort conditions above this threshold and causes delamination at the foil interface. The melt is applied as a 12–18 μm tie layer at 270–290°C on a flat-die laminating line; at these temperatures mild oxidation at the foil interface promotes adhesion, but residence time above 20 min in the die or feedblock generates gel counts exceeding 5 particles/m² and reduces bond strength tested by ASTM F904-16. Aluminium foil is corona-treated to 40–44 mN/m wetting tension before polymer contact, and back-pressure rolls are held at 70–90°C to flatten the web without heat-sealing the polyolefin substrate. Bond strength between foil and PP-based sealant web is typically 4–6 N/15 mm; below 3 N/15 mm the laminate risks tunnelling during retort. Since published data for this exact Celanese grade in retortable flexible laminations is limited, migration testing per EU Regulation 10/2011 and FDA 21 CFR 177.1350 must be repeated for each final structure. The grade is not recommended where the sealant web contains amine-based additives above 0.5 wt%, because acetic acid generated by EVA degradation reacts with amine species and produces visible odour and seal contamination.
Injection moulding of mineral-filled polypropylene compounds containing HQ 7-9 at 10–20 wt% is used for automotive interior trims that require low-temperature impact without complete loss of flexural modulus. The EVA phase with 7–9 wt% vinyl acetate disperses during compounding on a twin-screw extruder with L/D 32:1; resulting notched Izod impact strength at 23°C, tested to ASTM D256, increases from 25 J/m to 55 J/m as EVA loading moves from 10 wt% to 20 wt%, while flexural modulus per ISO 178 decreases from 1,800 MPa to 1,550 MPa. Moulding requires melt temperature of 200–230°C and clamp force sufficient to maintain cavity pressure of 30–50 MPa; injection speeds above 100 mm/s produce jetting and surface delamination when EVA dispersion is inadequate. The compound must not exceed 2,000 h of accelerated weathering under ISO 4892-2 without UV stabilizer addition because the vinyl acetate segment undergoes photo-oxidative chain scission and surface chalking. Published data for HQ 7-9 in filled PP impact modification is limited; formulation-specific melt flow rate by ISO 1133-1 and tensile properties by ISO 527 should be determined before commercial release.
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Celanese Vinyl Acetate EVA Grade HQ 7-9 is a semi-crystalline ethylene-vinyl acetate copolymer with a nominal vinyl acetate comonomer content controlled within the 7–9 wt% range. The designation is a supplier internal grade qualifier, not an ISO or ASTM classification; therefore, the technical identity of the material is established by the comonomer concentration, the melt mass-flow rate measured at 190 °C under 2.16 kg load according to ASTM D1238 or ISO 1133-1:2022, the density measured by ASTM D792 or ISO 1183-1:2019, and the thermal transitions obtained by differential scanning calorimetry per ASTM D3418 or ISO 11357-3. The material occupies a narrow segment of the EVA portfolio between conventional LDPE and higher-vinyl acetate grades. Relative to LDPE, the comonomer reduces crystalline regularity, decreases peak melting point, and imparts a measurable improvement in low-temperature flexibility and heat-seal response without the pronounced blocking and tensile modulus loss associated with 18–28 wt% vinyl acetate copolymers. Batch-specific values for melt flow rate, density, and additive package are reported on the certificate of analysis.
In commercial EVA copolymers with 7–9 wt% vinyl acetate, ethylene sequence lengths remain long enough to form a lamellar crystalline phase, but the crystals are thinner and less perfect than those in LDPE. Differential scanning calorimetry typically records a peak melting temperature in the range of 93–102 °C, whereas comparable LDPE grades melt at 104–113 °C. The reduction shifts heat sealing and thermoforming response to lower temperatures while retaining a Shore D hardness near 50–55 under ASTM D2240. Melt rheology follows shear-thinning behaviour typical of branched polyethylene and EVA; melt viscosity is controlled primarily by molecular weight and branching, not solely by vinyl acetate content. A grade in this comonomer band can be produced across a broad melt-index range, and processors should not infer a fixed melt-flow rate from the HQ 7-9 designation. Published data for this specific configuration is limited; the relevant melt-flow value must be taken from the lot certificate because it controls screw speed, head pressure, and drawdown.
| Property | Test methods | Representative band | Unit |
|---|---|---|---|
| Vinyl acetate content | Internal FT-IR or titration | 7–9 | wt% |
| Density at 23 °C | ASTM D1505 / ISO 1183-1:2019 | 0.925–0.932 | g/cm³ |
| Melt mass-flow rate at 190 °C / 2.16 kg | ASTM D1238 / ISO 1133-1:2022 | Grade-specific; commonly 7–25 | g/10 min |
| Melting peak | ASTM D3418 / ISO 11357-3 | 93–102 | °C |
| Vicat softening temperature, A50 | ASTM D1525 / ISO 306 | 75–88 | °C |
| Tensile stress at break | ASTM D638 / ISO 527-2 | 22–30 | MPa |
| Elongation at break | ASTM D638 / ISO 527-2 | 500–800 | % |
| Shore D hardness | ASTM D2240 / ISO 868 | 50–55 | — |
The representative bands in the table describe the property envelope associated with ethylene-vinyl acetate copolymers containing 7–9 wt% vinyl acetate and are not batch-specific guarantees for any single Celanese lot. When tensile testing is performed, specimen preparation and conditioning should follow ASTM D618 at 23 ± 2 °C and 50 ± 5% RH for 48 h, and measurements should be taken on plaques or films of controlled thickness because elongation at break is sensitive to gauge length and test speed.
On a 40:1 L/D co-rotating twin-screw extruder with barrel temperatures profiled from 150 °C in the feed zone to 205 °C at the die, the grade disperses as a sealant layer component when let down at 2.5–5.0 wt% into LDPE-rich films. Pre-drying is not required when ambient relative humidity remains below 60%; above that threshold, a 4 h desiccant dryer cycle at 55–65 °C minimizes surface moisture and prevents splay in cast-film extrusion. Twin-screw compounding with other polyolefins should avoid melt temperatures above 220 °C for residence times exceeding 10 min, because oxidative chain scission raises melt flow rate and generates gel specks in cast film.
Compared with higher-VA EVA grades containing 18–28 wt% vinyl acetate, the 7–9 wt% material retains a higher crystalline fraction, higher flexural modulus, and lower blocking. Its seal initiation temperature is moderately depressed relative to LDPE but is not as low as that of 18 wt% EVA. In heat-seal evaluations under ASTM F2029, comparable 8 wt% VA copolymers have shown seal initiation temperatures near 95–105 °C at 0.7 N/mm² seal-bar pressure and 0.5 s dwell, while 18 wt% VA grades may initiate below 85 °C under the same conditions. This distinction determines whether the grade is suitable for high-speed form-fill-seal lines where the sealant layer must not block during storage but must flow and wet aluminium foil or oriented polyethylene terephthalate at short dwell times.
| Material type | Vinyl acetate content | Melting peak | Seal initiation range | Adhesion to polar substrates | Flexural modulus relative |
|---|---|---|---|---|---|
| LDPE | 0 wt% | 104–113 °C | 105–115 °C | Low | High |
| Celanese EVA HQ 7-9 | 7–9 wt% | 93–102 °C | 95–105 °C | Moderate | Moderate-high |
| EVA 12 | 12 wt% | 85–93 °C | 85–95 °C | Moderate-high | Moderate |
| EVA 18 | 18 wt% | 80–86 °C | 78–88 °C | High | Low |
| EVA 28 | 28 wt% | 70–77 °C | 65–75 °C | Very high | Very low |
In extrusion coating onto 40–60 g/m² kraft paper or foil, the material is processed through a slot die with a 0.5–0.8 mm gap at melt temperatures between 280 °C and 320 °C. The lower vinyl acetate content reduces neck-in relative to 18–28 wt% EVA grades, but adhesion to polar substrates remains moderate. Corona treatment to 38–42 dyne/cm is often required to achieve peel adhesion above 2 N/15 mm when measured under ASTM F904.
Thermogravimetric analysis of EVA with 7–9 wt% vinyl acetate under nitrogen typically records the onset of thermal degradation near 360–380 °C, but oxidative decomposition in air begins at substantially lower temperatures, near 220 °C. High-shear compounding therefore requires antioxidant stabilization, commonly with hindered phenol and phosphite packages at total loadings of 300–800 ppm, to limit chain scission and discoloration. On a 25:1 L/D single-screw extruder with mixing pins and water-cooled feed throat, the melt temperature should be maintained below 200 °C. When a melt pump is used, suction pressure at the gear pump should remain below 10 MPa to prevent excessive shear heating. Avoid amine-based stabilizers if the downstream article is exposed to hot-air ageing in contact with certain acid copolymers; incompatibility with the additive package may cause surface bloom.
On a 3-layer blown-film line with 200 mm die diameter, 1.8 mm die gap, and blow-up ratio of 2.2:1, the grade can be used as the sealant layer when the frost line height is maintained at 8–10 times the die diameter. Bubble stability is improved by keeping air ring pressure between 4 and 6 mbar and melt pressure before the die below 35 MPa. The film should be allowed to condition at 23 ± 2 °C and 50 ± 5% RH for 48 h before coefficient of friction is measured under ISO 8295 or blocking is assessed under ASTM D3354. Without conditioning, slip and antiblock performance can appear artificially high.
Injection molding trials on a 120-ton hydraulic clamp machine with a 3.3:1 compression-ratio general-purpose screw and open nozzle indicate a stable processing window at melt temperatures of 180–220 °C and mould temperatures of 20–40 °C. Barrel settings above 230 °C increase the risk of oxidation and dark streaking if the residence time exceeds 10 min. Parts should be conditioned under ASTM D618 before dimensional measurements are taken according to ASTM D955. Shrinkage values in the range of 1.0–1.5% are typical for semicrystalline EVA with 7–9 wt% vinyl acetate in unfilled injection-moulded plaques, but they are dependent on gate size, injection speed, and holding pressure.
Ethylene-vinyl acetate copolymers intended for food-contact use are referenced in 21 CFR 177.1350; compliance of the finished article depends on the extractable fraction and residual vinyl acetate monomer concentration under the conditions of the food-contact application. Processors should request a regulatory statement from the supplier for each lot and verify that the additive package is included in the same food-contact clearance. Under European Union regulation EU 10/2011, the final formulation and overall migration must be assessed on the finished article, not inferred from the resin alone. RoHS Directive 2011/65/EU conformance requires confirmation that lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers do not exceed the specified maximum concentration values when measured by IEC 62321. REACH Article 33 declarations should be verified for substances of very high concern in the current ECHA candidate list.
