| HS Code | 422083 |
| Vinyl Acetate Content | 15–20 wt% |
| Density | 0.94 g/cm³ |
| Melt Flow Rate 190 C 2 16 Kg | 150 g/10 min typical |
| Melting Point Dsc | 70–80 °C |
| Vicat Softening Point A50 | 55–65 °C |
| Tensile Strength At Break | 12–18 MPa |
| Elongation At Break | 600–800% |
| Shore Hardness A | 90–95 |
| Flexural Modulus | 40–60 MPa |
| Glass Transition Temperature Tg | -30 to -20 °C |
| Refractive Index | 1.48–1.49 |
| Volume Resistivity | >10^15 Ω·cm |
As an accredited Celanese Vinyl Acetate EVA Grade HQ 15-20 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 25 kg polyethylene-lined paper bags, 40 bags per pallet, stretch-wrapped for safe transport and storage. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with drums of Celanese Vinyl Acetate EVA Grade HQ 15-20, securely stowed and ventilated per chemical transport regulations. |
| Shipping | Celanese Vinyl Acetate EVA Grade HQ 15-20 ships as solid pellets in moisture-resistant bags or bulk containers. Standard transport via truck or container is suitable; protect from direct heat, humidity, and contaminants. Ensure proper labeling as a non-hazardous plastic resin, with clean, dry conditions and secure loading to prevent bag damage during transit. |
| Storage | Store vinyl acetate monomer in a cool, dry, well-ventilated area away from heat, sparks, flames, sunlight, oxidizers, and polymerization catalysts. Maintain temperatures below 20°C. Keep containers tightly closed and properly grounded. Ensure the 15–20 ppm hydroquinone inhibitor remains effective by retaining dissolved oxygen—do not blanket with nitrogen. Inspect regularly for polymer formation or contamination. |
| Shelf Life | Shelf life is typically 12 months when stored sealed, dry, and cool, away from direct sunlight and extreme heat. |
Hot-melt adhesive formulations based on Celanese Vinyl Acetate EVA Grade HQ 15-20 are processed in the 130–170°C melt window and are specified where adhesion to coated board, polyester, and low-energy polyolefin surfaces must be maintained without solvent-borne primers. A standard batch uses 100 phr of the EVA copolymer, 30–45 phr hydrogenated C5/C9 hydrocarbon tackifier, 15–25 phr pentaerythritol ester of rosin where specific adhesion to printed cartonstock is required, 5–15 phr microcrystalline wax with a congealing point between 75°C and 90°C, 0.5–1.0 phr hindered phenolic antioxidant, and 0–0.3 phr slip agent for multi-bead slot-die coating heads. Mixing is carried out in a jacketed sigma-blade trough mixer of 300–500 L working volume under a nitrogen-purged lid. The jacket oil is set at 160–165°C; once the batch reaches 145–155°C, vacuum is applied at −0.8 bar for 20–30 min to strip low-volatile tackifier fractions. Discharge is completed before the melt exceeds 175°C because vinyl acetate deacetylation accelerates and acetic acid concentration in the vapor space rises to corrosive levels. Melt flow rate is selected against the application route and determined by ISO 1133-1:2022 at 190°C/2.16 kg: low MFR grades are used for slot-die and roller coaters, while higher MFR grades are required for spiral spray and fiberization lines. Viscosity is measured at 180°C on a Brookfield thermosel according to ASTM D3236; slot-die products are commonly held at 1,800–2,500 mPa·s, while spiral-spray grades are formulated below 1,500 mPa·s to avoid stringing. Shear-rate sweeps on a capillary rheometer under ASTM D3835 show shear-thinning exponents between 0.45 and 0.60. Heat resistance is evaluated by shear adhesion failure temperature under ASTM D4498 on 50 µm polyester film: formulations with tackifier below 40 phr retain SAFT values of 62–68°C, whereas raising tackifier to 45 phr or more depresses SAFT below 55°C and raises melt viscosity above 2,200 mPa·s. Food-contact packaging adhesives comply with FDA 21 CFR 175.105; EU constructions additionally require an overall migration assessment under EU 10/2011. Terminal products include folding carton closures, book spine adhesives, tray forming, and edge banding. On high-speed packaging lines, open time is set between 1.5 s and 3.0 s by adjusting wax content and quench roll temperature; excessive wax fractions above 15 phr produce chill roll release failure and adhesive transfer to cutting knives.
In crosslinked foam production for footwear midsoles, insoles, and sports mats, the polymer is compounded with 100 phr EVA, 0.5–0.7 phr dicumyl peroxide, 2.8–3.4 phr azodicarbonamide, 1.0–2.0 phr zinc oxide, 0.5–1.0 phr zinc stearate, and 10–20 phr precipitated calcium carbonate. The peroxide and blowing agent must be separated in storage; combined concentrates are avoided because dicumyl peroxide decomposition can be initiated by hot zinc oxide surfaces in high-speed mixers. Compounding is performed on an open two-roll mill with roll temperatures of 85–100°C and a friction ratio of 1.15:1 to 1.25:1, which disperses the azodicarbonamide without exceeding its decomposition onset. The milled sheet is cooled to 40–50°C, die-cut or slit, and then placed into a multi-daylight compression press with 600×800 mm platens and clamp force of 2,500–3,000 kN. Plate temperature is set at 160–165°C and maintained within ±2°C across the platen. Cure time is 25–35 min depending on slab thickness. The key process conflict is the sequence of crosslinking and gas nucleation: if the blowing agent decomposes before the crosslinked network reaches gel point, gas escapes along molten flow lines and creates split cells. If the peroxide crosslinks too rapidly, the compound reaches maximum torque before gas expansion is complete and density remains above 200 kg/m³ with Shore A hardness above 45. Gel fraction is determined by ASTM D2765-16 using boiling xylene extraction for 12 h; production lots with gel fraction above 85% produce closed-cell foams with density 130–180 kg/m³ and hardness 30–40 Shore A. Compression set is measured by ASTM D395 Method B at 50% deflection, 23°C, 24 h; values above 25% indicate incomplete cure or excessive filler. The table below presents representative property ranges for compression-molded specimens; published data for this specific Celanese grade is limited, and continuous slabstock data should be generated on a pilot line before production release.
| ADC loading (phr) | Product density (kg/m³) | Shore A hardness | Gel fraction (%) |
|---|---|---|---|
| 2.5 | 180–200 | 40–45 | 85–88 |
| 3.0 | 150–170 | 35–40 | 86–90 |
| 3.5 | 130–145 | 30–36 | 85–89 |
| 4.0 | 110–130 | 25–31 | 82–85 |
Finished midsoles must meet REACH Annex XVII PAH migration limits and are tested for density by ISO 845, tensile strength by ISO 37, elongation at break by ISO 37, and resilience by DIN 53512. After curing, water-cooled molds are opened at a rate of 0.2–0.5 mm/s to prevent vacuum collapse of the foam core. Terminal products include die-cut midsoles, insoles, and sports mats; continuous slabstock is split to 2–8 mm thickness.
Low-smoke, zero-halogen sheathing compounds based on Celanese Vinyl Acetate EVA Grade HQ 15-20 are formulated with high loadings of aluminium trihydrate to meet vertical flame spread requirements without emitting corrosive acid gases. The compound uses 100 phr EVA, 120–180 phr aluminium trihydrate with a median particle diameter of 1.5–2.0 µm and specific surface area 8–12 m²/g, 5–15 phr zinc borate, 1.0–2.0 phr vinyl silane coupling agent, 0.5–1.0 phr hindered phenolic antioxidant, and 0.5–1.5 phr metal stearate processing aid. The aluminium trihydrate is pre-dried at 80°C for 4 h to a residual moisture level below 0.1 wt%; otherwise water released in the extruder reduces filler dispersion and creates surface pitting on extruded cable. Compounding is carried out on a co-rotating twin-screw extruder with L/D 44:1 and a segmented screw design using kneading blocks after the first side-feed. Barrel temperatures are profiled from 110°C at the feed throat to 150°C at the die, with screw speed 300–450 rpm. Melt temperature is held below 170°C because the vinyl acetate segment can undergo deacetylation at higher temperatures, evidenced by brown specks, a drop in water-bath pH below 4.0, and a progressive loss of elongation. Vacuum venting at −0.9 bar absolute removes moisture and low-volatile silane hydrolysis products. The compounded pellets are then processed on a 60 mm single-screw cable line with a barrier screw and L/D 25:1, using a melt temperature of 150–160°C, a line speed of 15–40 m/min, and a drawdown ratio below 1.5:1. A tubing die with diameter 0.8 mm over the conductor is followed by a water bath at 25°C; inline spark testing is performed at 6 kV AC under IEC 62230. The flame retardant system is evaluated by limiting oxygen index under ASTM D2863, vertical flame spread under IEC 60332-3-24, smoke density under IEC 61034-2, and gas corrosivity by IEC 60754-1 and IEC 60754-2. Because published data for this specific Celanese grade in ATH-filled wire compounds is limited, the table reflects acceptance bands for comparable vinyl acetate copolymers and should be verified with production samples.
| Parameter | Test method | Typical acceptance band |
|---|---|---|
| Oxygen index | ASTM D2863 | 28–34% |
| Smoke density after 10 min | IEC 61034-2 | ≤ 60 |
| Halogen acid gas content | IEC 60754-1 | ≤ 0.5% |
| pH | IEC 60754-2 | ≥ 4.3 |
| Conductivity | IEC 60754-2 | ≤ 10 µS/mm |
| Tensile elongation at break | IEC 60811-501 | ≥ 150% |
When aluminium trihydrate loading is pushed beyond 180 phr, tensile elongation at break measured by IEC 60811-501 falls below 120% for many low-density EVA compounds; if the specification requires ≥150%, loading must be reduced to 150 phr and zinc borate adjusted to 8–12 phr to preserve char integrity. Terminal applications include building riser cable sheathing, control cable insulation, and rolling-stock wire jackets. RoHS and REACH SVHC screening apply to the finished cable, and the final construction may require a CPR declaration through EN 50575.
In three-layer cast film and sheet constructions, the EVA grade is used as the sealant skin in layer ratios of 10/70/20 or 15/70/15 at total thicknesses between 60 µm and 100 µm. The sealant layer formulation consists of 100 phr EVA, 500–1,000 ppm erucamide slip, 1,000–2,500 ppm synthetic silica antiblock with a particle size of 3–5 µm, and 200–500 ppm fluoropolymer processing aid. The materials are dry-tumbled and then fed to a 45 mm single-screw extruder with L/D 30:1 and a barrier screw; barrel temperatures are set from 180°C in the feed throat to 230°C at the adapter, with a flat T-slot die held at 230°C. The melt curtain is pinned to a chill roll at 15–22°C using an air knife and vacuum box; the die-to-roll gap is maintained below 10 cm to limit neck-in and thickness deviation to ±2%. Seal initiation temperature is measured on a laboratory heat-seal unit according to ASTM F1921, and seal strength is determined by ASTM F88 after 24 h aging at 23°C/50% RH. A typical seal strength fallback range is 18–25 N/25 mm at 130°C with 0.5 MPa jaw pressure and 0.5 s dwell, but published data for this specific HQ grade should be generated on the target film line. Eruamide blooms over 24–48 h; seal strength measured immediately after extrusion can overstate the steady-state value by 10–15%. Slip concentrations above 800 ppm provide blocking force below 0.1 N/cm² under ASTM D3354 but can reduce seal strength by 5–10%; corona treatment at 38–42 mN/m is applied before lamination to restore surface energy for water-based or solventless adhesives. Food-contact films are tested under EU 10/2011 for overall migration of ≤ 10 mg/dm², and US packaging uses FDA 21 CFR 177.1350 for the EVA copolymer with paperboard components covered by 21 CFR 176.170. Terminal products include lidding film, flow-wrap snack packaging, and medical pouch outer seals.
Polyolefin compounders evaluate Celanese Vinyl Acetate EVA Grade HQ 15-20 as an alternative impact modifier for injection-molded semistructural parts when service temperatures do not require deep sub-zero ductility. The blend composition is 12–18 wt% EVA in an LLDPE or polypropylene homopolymer matrix, with 0.1–0.3 wt% primary phenolic antioxidant and 0.1–0.2 wt% secondary phosphite antioxidant. Mixing is performed on a co-rotating twin-screw extruder with L/D 48:1, screw speed 600–800 rpm, and barrel temperatures from 160°C to 220°C. The melt is strand-pelletized; pelletized compounds with excessive fines above 2% indicate insufficient dispersive mixing or too-low die pressure. In the final molded part, the vinyl acetate phase is observed by scanning electron microscopy as dispersed domains of 0.5–2.0 µm. If domain size exceeds 3 µm, impact performance degrades because cavitation becomes too coarse to trigger shear yielding in the matrix. Charpy notched impact strength is measured per ISO 179-1:2010 at 0°C and −20°C; flexural modulus is tested by ISO 178. A balanced formulation targets ≥ 25 kJ/m² at 0°C while retaining modulus above 900 MPa. Injection molding is conducted on a 120 t hydraulic press with a screw diameter of 40 mm, injection speed 40 mm/s, melt temperature 220°C, and mold temperature 40°C; moldings are annealed at 80°C for 2 h to stabilize post-shrinkage. At −20°C, compounds with 15 wt% EVA generally show Charpy notched impact values 15–20% below equivalent ethylene-octene copolymer blends because the EVA backbone has a higher glass transition temperature; replacement of the full elastomer fraction is not recommended for cold-impact specifications. Published data for this specific configuration is limited, and a formulation latitude study using the converter's actual mold geometry is required. Terminal products include appliance housings, caps and closures, and automotive interior brackets.
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Celanese Vinyl Acetate EVA Grade HQ 15-20 is presented as a pelletized random ethylene–vinyl acetate copolymer feedstock. The designation carries a vinyl acetate co-monomer band of 15–20 wt% when measured by saponification and gas chromatography per ASTM D5594 or by infrared spectroscopy calibrated against ISO 8985:2022. The numeric suffix may alternatively denote a melt mass-flow rate window of 15–20 g/10 min at 190°C under 2.16 kg load per ISO 1133-1:2022. Because Celanese does not publish a decoded suffix key in the available product literature, exact boundaries should be confirmed against the lot certificate of analysis before extruder speed profiles and downstream haul-off are fixed. The “HQ” prefix is treated as a production-control identifier rather than an independent property descriptor. Published data specific to this Celanese grade are limited; physical and processing properties in this summary are class-typical for ethylene-vinyl acetate copolymers within the 15–20 wt% vinyl acetate band and are not certified lot-release values for HQ 15-20.
Vinyl acetate incorporation at 15–20 wt% depresses polyethylene crystallinity relative to low-VA copolymers. Class-typical density is 0.936–0.944 g/cm³ per ASTM D792. The peak melting endotherm is 82–87°C at 10°C/min under nitrogen per ASTM D3418. Shore A hardness is 88–92 per ASTM D2240, compared with 95–98 for EVA containing 9–12 wt% VA and 76–84 for EVA containing 25–28 wt% VA. Tensile stress at break on 2 mm compression-molded plaques tested at 500 mm/min with Type IV specimens per ASTM D638-14 falls near 15–20 MPa; elongation at break is typically 700–800%. Because crystalline order is lower, flexural modulus declines relative to low-VA EVA; this permits higher filler loading before the onset of brittle failure in molded parts. In heat-seal layers, the lower melting point reduces seal initiation temperature to 70–80°C versus 95–105°C for low-VA EVA or LLDPE seals. Seal strength per ASTM F88 reaches 15–20 N/25 mm at 120°C jaw temperature and 0.5 s dwell, although published data for HQ 15-20 in asymmetric PE/EVA seal structures are limited.
On blown-film and cast-film lines, the feed throat is held below 40°C to avoid pellet bridging, while the die zone is maintained at 190–210°C. A grooved-feed barrier screw with 25:1 L/D or greater yields stable output at melt pressures below 350 bar. No pre-drying is required when storage remains below 80°C and relative humidity below 60%; if surface moisture exceeds 0.05 wt%, desiccant drying at 60°C for 4 h restores processability. On a 40:1 L/D co-rotating twin-screw extruder with a barrel profile of 150–190°C, melt temperature is kept below 220°C; above this threshold deacetylation releases acetic acid, accelerating metal corrosion and gel-spec formation. Vacuum devolatilization is recommended when regrind content exceeds 30 wt% to strip acetaldehyde and residual acetic acid. Field data from production compounding lines show melt-pressure variation below ±15 bar when nominal melt flow rate is held within ±0.5 g/10 min per ISO 1133-1:2022.
Capillary rheometry at 190°C for EVA with 18 wt% VA and melt flow rate near 2.5 g/10 min shows apparent viscosity of approximately 1,200 Pa·s at 100 s⁻¹, 380 Pa·s at 1,000 s⁻¹, and 120 Pa·s at 10,000 s⁻¹ per ISO 11443. The power-law index between 100 s⁻¹ and 1,000 s⁻¹ is approximately 0.5, placing the material between LDPE homopolymer and higher-VA EVA in shear-thinning behavior. In extrusion coating on paperboard at 120 m/min, melt temperature is reduced to 230–250°C versus 285–305°C for LDPE, lowering odor generation and die-lip carbon build-up. Coat-weight variability across a 1,400 mm width remains below 3% when the die gap is set at 0.5 mm and the air gap at 200 mm.
The following matrix lists the standard methods and class-typical values used to assess the 15–20 wt% VA product class. Certified values for HQ 15-20 must be taken from the Celanese certificate of analysis.
| Parameter | Standard method | Class-typical range |
|---|---|---|
| Vinyl acetate content | ASTM D5594, ISO 8985:2022 | 15–20 wt% |
| Melt mass-flow rate | ISO 1133-1:2022 | 1.5–8 g/10 min; suffix may indicate 15–20 g/10 min |
| Density | ASTM D792 | 0.936–0.944 g/cm³ |
| Peak melting endotherm | ASTM D3418 | 82–87°C |
| Shore A hardness | ASTM D2240 | 88–92 |
| Tensile stress at break | ASTM D638-14 | 15–20 MPa |
| Elongation at break | ASTM D638-14 | 700–800% |
| Moisture content | Internal Karl Fischer | ≤0.05 wt% |
Thermogravimetric analysis at 10°C/min under nitrogen class-typically shows 1% mass loss at 310°C and 5% mass loss at 360°C for EVA containing 18 wt% VA, compared with 1% loss near 350°C for LDPE of similar melt index. The onset gap of 30–40°C restricts hot-air ovens, flame lamination, and radiant-heat activation. Deacetylation follows first-order kinetics with an activation energy near 180–200 kJ/mol in inert atmosphere; under oxidative conditions, acetic acid formation is accelerated by iron oxide and aluminum residues. Chromium-free barrel surfaces and low-iron tooling are required in hot-runner systems to limit corrosion and black-spec generation.
Substitution decisions require comparison with EVA grades outside the 15–20 wt% window and with acrylate copolymers. Table 2 summarizes class-typical property ranges; entries for HQ 15-20 are not certified and are drawn from published producer literature for the same co-monomer band.
| Parameter | Low-VA EVA (9–12 wt%) | HQ 15-20 (15–20 wt%) | High-VA EVA (25–28 wt%) | EMA (20 wt% MA) | EEA (15 wt% EA) |
|---|---|---|---|---|---|
| Density (g/cm³) | 0.930–0.935 | 0.936–0.944 | 0.950–0.960 | 0.942–0.947 | 0.930–0.935 |
| Peak melting (°C) | 95–104 | 82–87 | 68–75 | 80–85 | 88–92 |
| Shore A hardness | 95–98 | 88–92 | 76–84 | 84–88 | 86–90 |
| Tensile stress at break (MPa) | 18–25 | 15–20 | 8–14 | 9–13 | 10–14 |
Against low-VA EVA, the 15–20 wt% material lowers melting point, hardness, and stiffness but improves elongation and low-temperature impact. Against high-VA EVA, it retains higher tensile strength and better dimensional stability at 70°C. Against EMA and EEA, the EVA class shows generally higher tensile strength but lower resistance to acid hydrolysis.
Impact modification of polypropylene with HQ 15-20 at 20 wt% addition can raise notched Izod impact at -20°C from 4 kJ/m² to 8–12 kJ/m² per ISO 180/A, provided the EVA phase is dispersed below 2 µm in a co-rotating twin-screw extruder at 190–210°C. Differences from EPDM-modified PP include lower compound cost and higher surface gloss, but heat deflection temperature falls by 5–10°C per ASTM D648 at 0.45 MPa. Such substitution should be validated with rheological and impact specimens because published data for HQ 15-20 in polypropylene impact modification are limited.
Shifting from EVA with 9–12 wt% vinyl acetate to a 15–20 wt% vinyl acetate grade shortens open time and increases low-temperature adhesive toughness. In hot-melt mixing, melt viscosity at 180°C is lower than that of film-grade EVA with equivalent melt index; the material can be compounded on a twin-screw extruder or planetary mixer with rosin ester tackifiers at 15–30 wt% and paraffin wax at 5–15 wt%. Peel adhesion on aluminum foil per ASTM D1876 typically increases when vinyl acetate moves from 9–12 wt% to 15–20 wt% at equivalent melt flow rate, but published data for HQ 15-20 in solvent-free hot-melt formulations are limited. Application temperature is adjusted downward because the softening point falls between 70°C and 85°C.
Food-contact suitability must be confirmed against FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers or the relevant European Commission plastics regulation with migration testing under EU 10/2011. The grade carries REACH registration obligations in the European Union; supplier safety data sheets should be checked for SVHC content above 0.1 wt%. No intentionally added phthalates or heavy metals above packaging directive limits are expected, and the material falls within the scope of RoHS Directive 2011/65/EU for EVA thermoplastics. Medical device use requires additional assessment under ISO 10993-1 because the resin producer does not perform device-specific biocompatibility testing.
On a 30 mm co-rotating twin-screw extruder with 32:1 L/D, increasing screw speed above 200 rpm can raise melt temperature by 2–4°C per additional 10 rpm when running EVA with a melt flow rate near 2–3 g/10 min. Injection molding with clamp force above 1,000 kN and shot sizes above 25% of barrel capacity can generate melt temperatures above 215°C at back pressures exceeding 50 bar. Under such conditions, screw speed is reduced and back pressure increased in place of raising barrel temperature to avoid short-shot stress. Hot-runner manifolds are purged with LDPE after the production run because stagnant molten EVA in manifold dead zones may degrade to acetic acid and corrode tool steel. For color masterbatch production on a 75 mm single-screw extruder with 30:1 L/D, carbon black loadings of 40 wt% are processable using 200 mesh screens while pressure differential remains below 40 bar per screen change; motor load is 10–15% lower than on the same line running EVA with 9–12 wt% VA. Injection molding of thin-wall parts with 2 mm wall thickness uses barrel set points of 160–200°C, nozzle temperature of 200–210°C, and mold temperature of 20–40°C. Cooling time for 2 mm walls is 18–25 s when mold coolant is maintained at 15°C.
In footwear sole compounding, HQ 15-20 is used in blend form with high-VA EVA containing 28–33 wt% VA to balance rebound and abrasion resistance. Closed-mold foaming with 10–20 PHR azodicarbonamide and 2–4 PHR dicumyl peroxide at 160–175°C produces foamed densities of 0.20–0.35 g/cm³ when tested per ISO 845. Fill ratios between 0.6 and 0.8 reduce surface splits at demold compared with lower-VA EVA blends. Published data for HQ 15-20 in chemically crosslinked foam systems are limited, and formulation-specific rheometer curves per ISO 3417 should be generated before production scale-up.
