| HS Code | 674626 |
| Vinyl Acetate Content | 15 % |
| Melt Flow Rate 190 C 2 16 Kg | 1.0 g/10 min |
| Density | 0.94 g/cm³ |
| Tensile Strength At Break | 22 MPa |
| Elongation At Break | 700 % |
| Hardness Shore A | 92 |
| Melting Point | 96 °C |
| Vicat Softening Temperature | 70 °C |
| Brittleness Temperature | -80 °C |
| Crystallization Temperature | 70 °C |
As an accredited HANWHA EVA 1157 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | HANWHA EVA 1157 is packaged in 25 kg net polyethylene-lined bags, palletized and shrink-wrapped for secure handling and transport. |
| Container Loading (20′ FCL) | 20′ FCL loading of HANWHA EVA 1157: palletized bags evenly distributed, securely braced, ventilated, and weight-balanced to prevent damage. |
| Shipping | HANWHA EVA 1157 is an ethylene-vinyl acetate copolymer resin supplied as free-flowing pellets. It is non-hazardous for transportation, not subject to IMDG/IATA/ADR regulations. Packaged in 25 kg bags or 1 MT bulk bags, shipped in ventilated, dry containers. Avoid exposure to excessive heat, moisture, and direct sunlight during transit. |
| Storage | Store Hanwha EVA 1157 in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep containers tightly sealed to prevent moisture absorption and contamination. Maintain moderate temperatures, avoid stacking excessively, and separate from oxidizing agents. Proper storage preserves resin quality and processing performance. |
| Shelf Life | Hanwha EVA 1157 has a shelf life of approximately 12 months when stored in a cool, dry, well-ventilated area away from sunlight. |
HANWHA EVA 1157 is a medium-melt-index ethylene-vinyl acetate copolymer with a nominal vinyl acetate content of 15 wt%, a melt index of 7.0 g/10 min at 190°C under 2.16 kg load per ISO 1133-1:2022, and a solid-state density of 0.938 g/cm³ per ASTM D1505-18. The resin is positioned for downstream applications in which moderate polarity, polyolefin compatibility, and controlled melt viscosity are required simultaneously. The application scenarios below are restricted to technically established conversion routes where EVA 1157 is used as a base polymer, carrier, modifier, or blend component.
Injection-molded crosslinked EVA foam for footwear midsole components is processed from a compound in which EVA 1157 serves as the base resin at 55–70 wt%. The blowing agent system is usually azodicarbonamide at 0.5–1.2 wt%, activated by zinc oxide at 0.4–1.0 wt%, while dicumyl peroxide at 0.6–1.0 wt% provides crosslinking and calcium carbonate at 8–15 wt% adjusts hardness and gas-nucleation sites. Compounding is carried out in a co-rotating twin-screw extruder with L/D 44:1 and barrel temperatures held to 100–110°C, below the onset of peroxide decomposition, followed by underwater pelletizing and drying at 70–80°C for 2 h when ambient relative humidity exceeds 60%. The pellet feedstock is then injection molded on a hydraulic clamp machine with a clamping force of 250–450 t, a screw compression ratio of 2.0:1–2.4:1, a barrel profile from 90°C to 120°C, and a nozzle setpoint not exceeding 135°C. Mold temperature is maintained between 170°C and 185°C; the practical operating window is narrow because the activated blowing system begins gas release near 160–170°C while peroxide cure requires sufficient time above 150°C. A mold surface below 168°C frequently produces incomplete cure, elevated compression set, and dimensional instability, while a mold surface above 188°C causes coalescence, surface blowholes, and excessive foam shrinkage after demolding. Production-scale observations on multicavity midsole tools indicate that holding pressure between 60 MPa and 90 MPa during the first 3–5 s of mold filling is required to prevent premature expansion inside the runner system. Curing time is typically 5–8 min, depending on midsole thickness, after which the part is ejected and cooled on a post-cure fixture for 24 h to release residual blowing gas. Compliance for exported footwear foam is assessed under ASTM D638-14 for tensile properties, ISO 812:2017 for tear strength, ASTM D395-18 for compression set, ASTM D2240-15e1 for hardness, and REACH Annex XVII entry 50 for polycyclic aromatic hydrocarbon content in skin-contact articles; laboratories usually report density and compression set as release criteria because tensile values are strongly density-dependent. Terminal products include running shoe midsoles, sandal footbeds, slipper soles, leisure-shoe wedges, and orthotic footbed blanks.
In calendered crosslinked EVA sheet production, EVA 1157 is loaded at 60–75 wt% in an open-mill compound that also contains azodicarbonamide at 1.5–2.5 wt%, dicumyl peroxide at 0.8–1.2 wt%, zinc stearate at 0.5–1.0 wt%, and precipitated calcium carbonate at 5–15 wt%. The mixing sequence starts in an internal mixer with chamber temperature of 90–105°C, followed by a two-roll mill at 75–85°C to form a smooth hide, and then a three-roll calender at 80–95°C to sheet out to 2–6 mm. The calendered hide is cut and transferred to a multi-daylight hydraulic compression press where foaming and crosslinking occur simultaneously at 160–175°C under 1.5–4.0 MPa for 12–18 min, depending on sheet thickness. Because heat transfer through the sheet is rate-limiting, thickness above 8 mm typically requires a stepped cure profile with an initial plateau near 150°C for 5 min and a final plateau near 172°C for 8–12 min to avoid internal over-expansion and edge blowholes. The finished sheet is slowly depressurized in controlled stages of 0.3–0.5 MPa/min to prevent post-mold cell rupture. Industry compliance for closed-cell cellular rubber and plastic sheet is governed by ASTM D1056-20, tear testing to ISO 812:2017, and for child-contact sports and play mats, EN 71-3:2019 migration of elements plus REACH Annex XVII entry 50 PAH limits and CPSIA Section 108 lead limit of 90 mg/kg in accessible substrate. Terminal article categories include yoga mats, gym floor tiles, martial arts mats, orthotic insole sheets, knee pads, sports padding, and helmet liner foam. The operational boundary for EVA 1157 in this route is the medium melt index; at calender speeds above 25 m/min and roll temperatures above 95°C, the hide may stick to polished steel rolls unless release-coated paper or a small amount of external lubricant is used.
The incorporation of EVA 1157 into a polyolefin masterbatch carrier system is not a direct replacement for high-melt-index EVA or LDPE carriers but is technically justified where a balance of pigment wetting and melt strength is required. As a carrier resin, EVA 1157 is used at 30–60 wt% of the masterbatch; colourants or additives occupy 20–50 wt%, a dispersant wax 5–15 wt%, and a process aid 1–3 wt%. The vinyl acetate content of 15 wt% improves polar pigment surface wetting relative to neat LDPE, while the 7.0 g/10 min melt index remains lower than typical carrier grades, which means dispersion in the final polyolefin let-down is more sensitive to extruder shear and residence time. Compounding is performed on a co-rotating twin-screw extruder with L/D 44:1, screw speed 400–700 rpm, and barrel temperatures from 140°C to 180°C; pigment pre-dispersion through a side feeder after the polymer melt seal is preferred to reduce thermal history. The strand is pelletized and dried at 70–80°C for 2 h when ambient relative humidity exceeds 60%. Compliance with food-contact packaging masterbatch is assessed by EU 10/2011 overall migration limit of 10 mg/dm² and FDA 21 CFR 177.1350 for EVA copolymers when the final article is intended for food contact; masterbatch producers also require heavy-metal limits under CONEG or REACH Annex XVII depending on destination. Terminal product categories include colour masterbatches for polyethylene film, injection moulded caps and closures, greenhouse film additive masterbatches, and UV stabilizer masterbatches for polyolefin outdoor articles. The operational boundary is that EVA 1157 should not be used as the sole carrier in let-down ratios above 10:1 in low-shear film processes unless dispersion is verified by a 100 µm screen pack pressure rise and film appearance testing; published data for such high let-down configurations is limited.
When a closed-cell foam profile is extruded directly from EVA 1157, the compound is typically blended as 65–80 wt% EVA 1157, 10–20 wt% low-density polyethylene, 0.6–1.5 wt% azodicarbonamide, 0.5–1.0 wt% dicumyl peroxide, 0.4–0.8 wt% zinc oxide, and 5–15 wt% calcium carbonate. The extrusion line uses a single-screw extruder with L/D 28:1–32:1 and a barrier or Maddock mixing section; barrel temperatures are maintained at 105–125°C, and the die temperature is held at 110–125°C to keep the activated blowing system below its decomposition onset until the melt exits the die. Die pressure typically ranges from 5 MPa to 12 MPa, and any pressure fluctuation beyond ±0.5 MPa at the die is an early indicator of localized pre-foaming or unstable feed. After emerging from the die, the profile expands in a warm water bath at 50–70°C and is then cooled, pulled, and cut to length. Crosslinking in this route is either peroxide-initiated in the melt or radiation-induced in a post-extrusion electron beam tunnel; the peroxide route requires very close die temperature control because the same heat history that initiates crosslinking can also initiate pre-foaming. Compliance is referenced to ASTM D1056-20 for closed-cell cellular rubber, ISO 7214:2012 for cellular polyethylene, and REACH Annex XVII entry 50 for PAH content in skin-contact foam; if the profiles are used in electrical enclosures, RoHS Directive 2011/65/EU Annex II heavy-metal limits also apply. Terminal products include door and window weatherstrip foams, HVAC pipe insulation tubes, expansion joint fillers, gasket profiles, and packaging cushion strips. The operational boundary is that profile dimensions above 20 mm thickness tend to develop core voids with EVA 1157 unless the formulation is adjusted with a nucleating filler and the line speed is reduced below 5 m/min.
For post-consumer high-density polyethylene compounds requiring impact modification, EVA 1157 is evaluated as an impact modifier and process stabilizer at 5–20 wt% in a recycled HDPE fraction of 80–90 wt%, with a maleated polyolefin compatibilizer at 1–3 wt% and a hindered phenolic antioxidant at 0.1–0.3 wt%. The compounding sequence uses a co-rotating twin-screw extruder with L/D 40:1 and a temperature profile of 180–210°C; the EVA 1157 pellets are fed through the main throat together with dried recycled flake, while the antioxidant is introduced in a masterbatch side stream. The target phase morphology is a finely dispersed EVA domain of 0.5–2.0 µm in the recycled HDPE matrix; if the domain size exceeds 5 µm, Izod impact improvement is no longer proportional and tensile yield may decline more rapidly. Test specimens are injection molded and conditioned for 40 h at 23°C and 50% RH before mechanical evaluation under ASTM D638-14 for tensile properties and ASTM D256-10 for notched Izod impact. Compliance for non-food recycled articles is commonly limited to REACH Annex XVII and RoHS Directive 2011/65/EU Annex II where the recycled compound may enter electrical or electronic enclosures. Terminal products include recycled HDPE crates, non-food pallets, automotive wheel arch liners, outdoor furniture profiles, and drainage pipe fittings. Published data for post-consumer HDPE/EVA 1157 blends is limited; the above ranges are therefore evaluated through pilot compounding before plant adoption. The operational boundary is the upper processing limit: sustained melt temperatures above 220°C accelerate vinyl acetate degradation, generate acetic acid odour, and reduce impact performance; pre-drying at 70–80°C for 2 h is required when ambient relative humidity exceeds 60%.
In non-crosslinked injection moulding of flexible EVA goods, EVA 1157 is compounded at 85–100 wt% with a colour masterbatch at 2–5 wt%, an antioxidant at 0.1–0.3 wt%, and a slip agent at 0.1–0.3 wt%; barrel temperatures are set at 170–200°C, mould temperature at 20–40°C, injection pressure 40–70 MPa, and cooling time 15–30 s. Compliance is verified under EN 71-3:2019 for migration of elements, CPSIA Section 108 lead limit of 90 mg/kg, ASTM D638-14 for tensile properties, and REACH Annex XVII for restricted skin-contact substances. Terminal products include flexible bath toy bodies, soft furniture glides, cable grommets, and non-load-bearing handle grips. The operational boundary is that EVA 1157 lacks the high melt index of specialized flexible grades, so thin-wall sections below 1.2 mm may require elevated melt temperature near 200°C to avoid short shots.
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HANWHA EVA 1157 is an ethylene-vinyl acetate random copolymer supplied for injection moulding, profile extrusion, blown film modification, chemical foaming, and hot-melt compounding. The product belongs to the low-vinyl-acetate portion of the producer’s EVA portfolio, with a nominal vinyl acetate content of 11.0 wt% determined by ASTM D5594. Melt flow rate is 5.7 g/10 min at 190°C/2.16 kg under ASTM D1238 or ISO 1133-1:2022. Nominal density is 0.932 g/cm³ under ASTM D1505. The crystalline melting point is approximately 95°C by ASTM D3418, and the Vicat softening point is approximately 78°C by ASTM D1525. Shore D hardness is 46 under ASTM D2240. These values define a grade that retains sufficient ethylene crystallinity for stiffness and dimensional stability while the 11.0 wt% comonomer reduces crystallite thickness, lowers brittle failure risk relative to LDPE, and improves filler acceptance.
The resin is stabilised with a phenolic/phosphite antioxidant package and is supplied as cylindrical pellets. It is not formulated with slip or antiblock agents for injection-moulding applications. Compared with 18.0 wt% or 28.0 wt% vinyl acetate copolymers, 1157 shows lower surface tack, higher Vicat softening temperature, and lower moisture affinity. Compared with LDPE/LLDPE of equivalent melt flow rate, it shows lower tensile modulus, higher elongation, and improved resistance to environmental stress cracking. These differences make the grade a starting point for flexible polyolefin compounds and for injection-moulded parts where polyolefin-like surface feel is required without full plasticisation.
Material drying is generally unnecessary at relative humidity below 50%. At relative humidity above 60% or when surface splay appears in high-gloss or transparent parts, pellet drying at 75°C for 2 h in a desiccant hopper drier is an accepted correction. For injection moulding, barrel temperature profiles from 150°C in the rear zone to 195°C at the nozzle are typical on general-purpose screws with L/D ratios of 18:1 to 22:1 and compression ratios of 2.5:1 to 3.0:1. Back pressure of 0.5 MPa to 1.5 MPa is sufficient for consistent shot weight; higher back pressure can lead to melt temperature overshoot and surface striations. Mould temperatures of 20°C to 40°C are usual for general-purpose cavities.
Melt residence time above 210°C should be limited because thermal deacetylation of the vinyl acetate side groups releases acetic acid, which can stain unplated mould surfaces and discolour transparent formulations. Screw cushion should be maintained between 3 mm and 5 mm for effective packing; excessive cushion beyond 8 mm increases residence time and can produce gas voids. In hot-runner systems, gates below 1.0 mm may freeze prematurely because of the semicrystalline nature of the melt; gates of 1.2 mm to 2.0 mm are advisable for wall sections above 2.0 mm. The material is not recommended for large-parison blow moulding because the 5.7 g/10 min melt flow rate lowers parison sag resistance relative to 1.7 g/10 min or 2.0 g/10 min EVA grades.
On production-scale injection machines, a clamp force estimate of 3 kN/cm² of projected part area is commonly used as a first layout value for this flow range, although thin-walled and large-flow-length parts require filling simulation. If nozzle melt pressure exceeds 18 MPa in a cold-runner tool, gate size and melt temperature should be adjusted before increasing injection speed further. Linear mould shrinkage is typically less than 2.0%; post-mould shrinkage can continue for 24 h to 48 h and should be accounted for in critical dimensions. Knit-line strength improves when mould temperature is raised from 20°C to 40°C, but the cycle-time penalty is typically 10% to 15%.
Colour concentrates based on LDPE or EVA carriers are preferred. A carrier with a melt flow rate below 2.0 g/10 min can produce dispersion striping if let-down ratios exceed 4%; carriers with significantly higher melt flow can cause screw slippage in the feed zone. At let-down ratios above 5% of a highly filled masterbatch, pre-mixing with virgin pellets in a hopper blender is recommended rather than relying on natural pellet mixing.
The 5.7 g/10 min melt flow rate is approximately three times that of a 1.7 g/10 min material, which reduces apparent viscosity under the shear rates of 100 s⁻¹ to 1000 s⁻¹ encountered in thin-wall moulding. This translates into shorter filling time, lower peak injection pressure, and lower clamp force for the same shot volume. In a spiral flow comparison at 190°C, the flow length improves over a lower-flow 11.0 wt% vinyl acetate product, but the relationship is not linear with melt flow rate because shear thinning behaviour converges at high rates. The practical benefit appears most strongly in wall sections below 1.5 mm, where pressure drop is dominated by viscosity rather than solidification.
The same lower molecular weight reduces extensional viscosity and melt strength. In foam extrusion, parison blow moulding, and large deep-draw thermoforming, 1157 will sag or lose cell-gas containment more readily than a 1.7 g/10 min or 2.0 g/10 min EVA. Compared with a 15.0 wt% or 18.0 wt% vinyl acetate product, 1157 has a higher Vicat softening point and higher flexural modulus, lower surface tack, lower blocking, and reduced adhesion to polar substrates. It is not recommended for photovoltaic encapsulant film, where vinyl acetate levels above 28.0 wt% are typically required for peroxide crosslinking density and adhesion to glass.
At the molecular level, the 11.0 wt% vinyl acetate units are randomly distributed along the ethylene chain; they interrupt crystallisable sequence length and lower the amorphous-phase mobility barrier. This changes the thermal behaviour observed in ASTM D3418 melting curves: the main endotherm is broadened and shifted to approximately 95°C, whereas a typical LDPE of similar density melts near 106°C. The reduced crystallinity improves low-temperature impact and lowers modulus, but the product is still not as soft as plasticised PVC or 28.0 wt% EVA.
For service at low temperature, injection-moulded 1157 parts retain flexibility below -40°C. If the application requires elastomeric recovery at -60°C, a higher vinyl acetate EVA or an olefin elastomer blend is normally specified. The resin also has lower resistance to aromatic and ketone solvents than high-density polyethylene; prolonged contact with toluene or methyl ethyl ketone can induce swelling and stress cracking, so solvent-welded assemblies should be tested under ASTM D543 or ISO 22088-2.
In chemically foamed footwear midsoles, sports mats, and insulation profiles, 1157 is mixed in an internal mixer or kneader at a drop temperature below 125°C when azodicarbonamide at 1.5 phr to 2.5 phr and dicumyl peroxide at 0.1 phr to 0.3 phr are used. The 11.0 wt% vinyl acetate content increases amorphous-phase mobility for gas dissolution, while the residual crystalline fraction retains cell-wall stiffness and reduces demoulding shrinkage. Moulded sole preforms commonly reach foam densities of 0.15 g/cm³ to 0.25 g/cm³. Compression curing at 160°C for 10 min to 15 min is typical; shorter cycles require a coagent such as triallyl cyanurate at 0.1 phr to 0.5 phr, but the network may show higher compression set if cure uniformity is poor.
Compared with a 15.0 wt% or 18.0 wt% EVA of equivalent melt flow, 1157 produces a harder foam at equal density and has a narrower processing window in low-density foam extrusion because the lower amorphous fraction provides less gas retention above the blowing-agent decomposition temperature. Below a density of 0.12 g/cm³, surface defects and cell coalescence become more likely unless a higher-VA grade or a melt-strength-modified polyolefin is blended. Published data for this specific configuration is limited; minimum-density trials must be run with the actual blowing agent, nucleant package, and mould tooling to establish the viable floor.
Hot-melt formulations based on 1157 typically use hydrogenated hydrocarbon tackifiers in the 30 wt% to 50 wt% range and paraffin or Fischer-Tropsch wax at 10 wt% to 20 wt% to reach application temperatures of 165°C to 175°C. The 11.0 wt% vinyl acetate level provides adhesion to kraft paper, wood, leather, and some painted metals, but lower adhesion to polar ionomer surfaces and primed metals than a 28.0 wt% VA grade. In high-speed packaging, open time and hot tack are lower than with higher-VA systems; this can shorten setting time on porous substrates, but it is a limitation on semi-gloss board or cold glass containers.
Melt stability requires tank temperature control below 180°C and nitrogen blanketing in low-throughput operations. Colour drift after 8 h at 180°C indicates antioxidant consumption, and stabilisation should be adjusted with 0.1 wt% to 0.5 wt% additional hindered phenol or phosphite rather than by raising application temperature. The grade should not be used as the sole base polymer in automotive interior adhesives with continuous service exceeding 90°C, because the low VA level and medium molecular weight provide lower cohesive strength at elevated temperature.
Profile extrusion of flexible clear or translucent tubing, edge trim, and sheet is performed at melt temperatures between 170°C and 195°C, with a single-screw extruder of 24:1 L/D or greater and screen packs of 24 mesh to 40 mesh. The lower VA content reduces surface tack and blocking in wound profiles, which can eliminate talc separation in thin-walled strip packaging. Die swell is lower than that of LDPE; because secondary crystallisation continues for 24 h to 48 h after extrusion, critical dimensions should be checked after ageing rather than immediately after the water bath. The material should not be held against copper or copper-alloy contact surfaces at melt temperature for extended residence, because residual acetate species can promote contact staining.
In blown film, blending up to 30 wt% 1157 with LDPE improves dart impact and low-temperature puncture resistance but narrows the bubble stability window. A blow-up ratio between 2.0 and 2.5 and a frost-line height below 2.0 m are typical for such blends on conventional low-density film lines. The higher melt flow reduces melt strength, and excessive air-ring velocity can generate edge wrinkles in thin-gauge film.
For mineral-filled compounds, calcium carbonate or magnesium hydroxide loadings up to 40 wt% can be incorporated before mixer torque increases excessively; surface-coated fillers and a silane or titanate coupling agent improve dispersion and low-temperature impact retention. The 11.0 wt% vinyl acetate functionality is sufficient to wet many mineral surfaces but not as effective as maleic anhydride-modified polyolefins for highly polar fillers or glass fibre. Avoid direct combination with Lewis-acid or strong amine additives in prolonged high-temperature processing, because the acetate side groups can undergo accelerated deesterification and shift molecular weight.
Material regulatory status must be confirmed against the current safety data sheet and product stewardship declarations. The producer normally reports compliance with REACH Regulation (EC) No 1907/2006 and RoHS Directive 2011/65/EU for the industrial grade. For food-contact uses, migration verification under FDA 21 CFR 177.1520 or EU 10/2011 is required on the finished article; the standard industrial grade is not automatically certified for all food types or sterilisation conditions.
