| HS Code | 301385 |
| Va Content | 18% |
| Melt Flow Index | 26 g/10min (190°C, 2.16kg) |
| Density | 0.939 g/cm³ |
| Melting Point | 86°C |
| Vicat Softening Point | 63°C |
| Tensile Strength At Break | 13 MPa |
| Elongation At Break | 700% |
| Hardness | Shore D 31 |
| Flexural Modulus | 28 MPa |
| Brittleness Temperature | -70°C |
As an accredited HANWHA EVA 1826 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Hanwha EVA 1826 is supplied in 25 kg multi-ply paper bags, palletized and stretch-wrapped for safe transport and handling. |
| Container Loading (20′ FCL) | 20′ FCL loading of Hanwha EVA 1826: packed in 25kg bags, palletized, shrink-wrapped, around 20 metric tons per container. |
| Shipping | HANWHA EVA 1826 is supplied as ethylene-vinyl acetate copolymer pellets. It ships in multi-layer paper or polyethylene bags, palletized and wrapped for moisture protection. Transport via sea freight in containers or truck/rail is standard. Avoid excessive heat and direct sunlight. Not classified as dangerous goods under normal conditions. |
| Storage | Store HANWHA EVA 1826 in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture absorption and contamination. Maintain room temperature and avoid stacking excessively high to prevent deformation. No special storage hazards exist, but protect from mechanical damage and static buildup. |
| Shelf Life | Store in a cool, dry place away from direct sunlight. Shelf life: 12 months from date of manufacture. |
In compression-molded midsole production, HANWHA EVA 1826 is compounded as the primary resin because the 18 wt% vinyl acetate comonomer content shifts the crystalline melt peak below 90 °C while maintaining enough chain regularity for low-temperature flexural endurance. The resin is supplied at a melt flow index of 2.6 g/10 min under ISO 1133-1:2022 at 190 °C with a 2.16 kg load and a nominal density of 0.940 g/cm³ under ISO 1183-1:2019. The compound is prepared on a 75 mm counter-rotating twin-screw extruder with an L/D ratio of 32:1 and oil-cooled barrel zones held between 95 °C and 115 °C. Azodicarbonamide in the range of 3.0 phr to 4.5 phr is dispersed alongside dicumyl peroxide at 0.8 phr to 1.0 phr. The blowing agent is selected for a gas yield of 220 ml/g at STP. Zinc oxide at 1.0 phr to 1.5 phr is added as a kicker to reduce the azodicarbonamide decomposition exotherm into the 160 °C to 170 °C window. Zinc stearate at 0.6 phr to 1.0 phr functions as both lubricant and secondary blowing agent activator. Trimethylolpropane trimethacrylate at 0.5 phr to 1.0 phr raises crosslink density without increasing Mooney scorch. The open-mill addition of peroxide and blowing agent is held below 80 °C because dicumyl peroxide has a 1 h half-life temperature near 135 °C and activated azodicarbonamide can start gas release above 150 °C. The milled batch is sheeted to 8 mm to 12 mm thickness and blanked into preforms. Pre-drying at 60 °C for 2 h is applied when pellet surface moisture exceeds 0.05 wt% after storage under 70% relative humidity.
Compression presses run a preheat stage at 110 °C for 8 min, then a cure stage at 160 °C to 165 °C for 6 min under 15 MPa, followed by cooling to 30 °C before release. The mold cavities are vented at the split line every 150 mm to allow gas displacement without trapping air pockets. If the cure stage exceeds 170 °C, dicumyl peroxide decomposition and azodicarbonamide gas evolution overlap sharply, causing torn cell walls and surface blisters. If the stage falls below 150 °C, crosslink density is insufficient and the foam collapses during post-cure expansion. This narrow temperature tolerance is the primary bottleneck on high-speed midsole lines. Batch-to-batch variance in the EVA 1826 melt index of more than 0.3 g/10 min shifts the mill sticking point and alters preform thickness. A 500 t to 1,000 t hydraulic compression press with platen parallelism controlled to 0.05 mm/m is used. The finished foam is controlled to a density of 0.12 g/cm³ to 0.18 g/cm³ by adjusting blowing agent loading and mold volume. Hardness after cooling is 45 Asker C to 60 Asker C. Compression set at 50% deflection for 22 h at 23 °C is recorded from 35% to 55% using ASTM D395-18 Method B. Rebound resilience is measured at 23 °C after 24 h conditioning under DIN 53512:1990. These values are internal lot-to-lot control points because final midsole properties depend on mold cavity geometry, skin thickness, and storage time.
| Property | Method | Condition | Process control function |
|---|---|---|---|
| Density | ISO 845:2006 | 23 °C, 50% RH | Blowing agent dosage feedback |
| Hardness | ASTM D2240-15 | Shore Asker C, 15 s dwell | Compression set prediction |
| Compression set | ASTM D395-18 Method B | 50% deflection, 23 °C, 22 h | Cure state verification |
| Rebound | DIN 53512:1990 | 23 °C, specimen 20 mm | Cell wall recovery variance |
| Tensile strength | ISO 1798:2008 | 100 mm/min, dumbbell type 2 | Skin/core uniformity |
Calcium carbonate filled sheet foam made from HANWHA EVA 1826 is run on flat-die extrusion lines with a downstream hot-air foaming oven. The base compound contains 100 phr EVA 1826, 20 phr to 40 phr LLDPE, and 30 phr to 50 phr stearic-acid-coated calcium carbonate. The vinyl acetate groups reduce melt viscosity and improve filler wetting compared with LDPE-only systems. The extruder is a single-screw machine with a barrier screw and an L/D ratio of 30:1; a gear pump is placed between the extruder discharge and the flat die to reduce surging. Barrel settings are kept between 110 °C and 130 °C. The die land is heated to 120 °C. The sheet is quenched to a surface temperature of 35 °C before entering a hot-air tunnel. The tunnel zone temperature is set at 190 °C to 210 °C. Expansion ratios are adjusted by changing haul-off speed and oven residence time. At 50 phr calcium carbonate, melt extensional viscosity drops enough that cell wall rupture appears as pinholes when the sheet is drawn above a 2.5:1 linear expansion ratio. A silane-coated calcium carbonate at 2 wt% loading improves cell wall stability but raises compound cost. The finished sheet is trimmed to 4 mm to 12 mm thickness and used in anti-fatigue mats and protective packaging. Density is in the 0.08 g/cm³ to 0.15 g/cm³ range, measured under ISO 845:2006. Filler loading is limited by tear resistance rather than dispersion. Above 60 phr, the sheet loses interlayer skiving strength. A single-screw extruder with an L/D ratio below 25:1 is not recommended for this formulation because distributive mixing of 30 phr filler into EVA 1826 requires a longer melt residence time. Edge trim from the sheet is recycled at up to 15% by weight, but only if it is ground and dried to below 0.1 wt% moisture.
In injection molding of closed-cell EVA sandals, HANWHA EVA 1826 is fed as a pre-blended pellet with a chemical blowing agent masterbatch rather than as a neat resin. The screw is a general-purpose metering screw with 20:1 L/D ratio and 2.0:1 compression ratio. The barrel temperature profile from feed to nozzle is 130 °C, 140 °C, 145 °C, 150 °C. The mold is heated to 160 °C to 175 °C. Injection pressure is set at 80 MPa to 120 MPa, with holding pressure reduced to 30% of injection pressure. During the breathing step, the moving platen opens 0.5 mm to 1.5 mm to permit controlled foaming. A shutoff nozzle is required to prevent pre-foaming in the runner. The melt residence time is capped at 10 min. Longer residence produces superficial yellowing and a rise in acetic acid odor from vinyl acetate decomposition. Gas evolution creates void volumes from 20% to 35%. Final sandal density is between 0.18 g/cm³ and 0.22 g/cm³, measured under ISO 845:2006. White pigment addition at 2.0 phr titanium dioxide is common. The molded part is cooled for 75 s to 120 s before ejection. Ejection pins must have large surface area because the hot foam has low compression strength and punctures easily. Multi-cavity tools often show a weight variation of 1.5% to 3.0% across cavities when runner balancing is not adjusted for the foaming pressure drop; flow leaders are cut into the runner to reduce this variation. Materials requiring only simple mixing or low-cost part filling should remain in compression molding because injection molding this grade is justified only when the part geometry includes undercuts or strap anchors.
Halogen-free cable sheathing compounds based on HANWHA EVA 1826 are formulated with a total flame-retardant filler loading of 120 phr to 180 phr. Aluminium trihydrate contributes endothermic dehydration starting near 205 °C; magnesium dihydroxide shifts the second heat sink to 330 °C. A typical ratio is 80% ATH to 20% MDH by weight. The EVA 1826 phase is used at 30 phr to 50 phr, with the balance being LLDPE or metallocene polyethylene. The vinyl acetate content increases filler wetting and lowers equilibrium torque during twin-screw compounding. Screw zones are kept below 140 °C to avoid premature release of acetic acid from the EVA phase during filler incorporation. The compound is protected with a hindered phenolic antioxidant at 0.5 phr and a metal deactivator at 0.1 phr. A vinyl silane coupling agent at 1.0 phr is added with the filler. Limiting oxygen index is typically in the 28% to 34% band for a 160 phr total filler formulation, tested according to ISO 4589-2:2017. Compound tensile strength after 168 h of hot air aging at 100 °C is monitored for elongation retention according to ISO 527-2:2012. Retention below 80% indicates oxidative chain scission in the EVA phase. The main operational boundary is moisture absorption by ATH. Pre-drying of the compound is necessary if pellet moisture exceeds 0.1 wt% before extrusion onto copper. Processing on a 90 mm single-screw extruder with a low-shear barrier screw and an L/D ratio of 30:1 is suitable. Published data for this specific EVA 1826 grade under full-scale cable fire performance tests such as IEC 60332-1-2 is limited; the formulation strategies described here derive from general EVA-based low-smoke zero-halogen sheath practice.
Cylindrical crosslinked blocks of HANWHA EVA 1826 are compression molded and then rotary-skived into continuous sheet for gasket liner and cushioning layers. Block molding is performed in a heated cylindrical press at 160 °C to 165 °C for 40 min depending on block diameter. The block diameter is typically 1.2 m. The block length is 2.0 m. After cooling, the block is mounted on a skiving machine equipped with a 0.8 mm to 2.0 mm blade gap. The skived sheet is rolled under low tension to prevent necking. The closed-cell sheet is then conditioned at 80 °C for 24 h to remove residual volatiles. Compression set is evaluated after 50% deflection at 70 °C for 22 h using ASTM D395-18 Method B. Low-compression-set variants use a co-agent package that raises gel content above 70% using ASTM D2765-16 before skiving. Cell counts are controlled to 80 cells/25 mm to 120 cells/25 mm by optical microscope image analysis to maintain consistent fluid sealing. The vinyl acetate content in EVA 1826 is high enough for contact adhesive adhesion on one side, while the crosslinked network prevents cold flow under gasket compression. Installed gaskets are limited to continuous service below 70 °C; at higher temperatures, the compressed cell structure loses thickness recovery. A maximum compressive stress of 0.3 MPa is specified for sealing flanges to avoid permanent cell collapse. The skived liner is not intended for direct contact with aromatic solvents or esters because the EVA phase swells. If direct solvent contact is expected, a fluoropolymer facing layer is applied.
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Introduced within the HANWHA EVA copolymer portfolio of Hanwha TotalEnergies Petrochemical Co., Ltd., HANWHA EVA 1826 is an ethylene-vinyl acetate thermoplastic resin with a nominal vinyl acetate comonomer incorporation of 18 wt% and a melt mass-flow rate of 2.6 g/10 min when determined at 190°C under a 2.16 kg dead weight in accordance with ASTM D1238. The grade is manufactured as a pelletized copolymer under CAS number 24937-78-8 and is supplied with a typical density of 0.941 g/cm³ per ASTM D1505. The 18 wt% vinyl acetate content places the material in the intermediate polarity range of the producer’s EVA series: it offers a measurable reduction in crystalline melting point relative to 13 wt% and 15 wt% vinyl acetate grades, while retaining greater melt strength than 28 wt% vinyl acetate grades used in hot-melt compounding. The melt rheology at 190°C corresponds to a relatively low-viscosity thermofusible material suitable for injection molding, extrusion foaming, and compounding; the same comonomer content introduces polar acetate side groups that modify adhesion to polar substrates and increase compatibility with fillers such as calcium carbonate, zinc oxide, and magnesium hydroxide compared with nonpolar LDPE homopolymer. Published producer data for HANWHA EVA 1826 indicate a Shore A hardness of 88, a Vicat softening point of 64°C, and a melting peak near 82°C. These values should be read as typical lot averages, not as substitute specifications; each commercial shipment is governed by the certificate of analysis.
Lot-to-lot control of the copolymer is anchored to a small set of standardized methods. Melt mass-flow rate testing per ASTM D1238-20 or ISO 1133-1:2022 at 190°C and 2.16 kg yields a nominal 2.6 g/10 min, with producer-typical control limits around ±0.3 g/10 min. Vinyl acetate content is determined by infrared spectroscopy per ASTM D5594; the 18 wt% target alters the sequence distribution along the polyethylene backbone and reduces crystallinity to the range associated with a 82°C melting peak and a 64°C Vicat softening point. Density at 23°C is 0.941 g/cm³ per ASTM D1505, which is useful for gravimetric feed calibration on loss-in-weight dosing units. The Shore A hardness of 88 per ASTM D2240 positions the material in the soft-flexible range, and the tensile property envelope is commonly reported around 21 MPa stress at break and 800% elongation at break per ASTM D638. The table below consolidates the principal published values.
| Property | Test method | Typical value |
|---|---|---|
| Vinyl acetate content | ASTM D5594 | 18 wt% |
| Melt mass-flow rate (190°C, 2.16 kg) | ASTM D1238 | 2.6 g/10 min |
| Density at 23°C | ASTM D1505 | 0.941 g/cm³ |
| Melting peak | ASTM D3418 | 82°C |
| Vicat softening point A50 | ASTM D1525 | 64°C |
| Shore A hardness | ASTM D2240 | 88 |
| Tensile strength at break | ASTM D638 | 21 MPa |
| Elongation at break | ASTM D638 | 800% |
On single-screw extruders with L/D ratios between 24:1 and 30:1, HANWHA EVA 1826 is normally processed with a barrel temperature profile beginning at 150°C in the feed zone, rising to 180°C in the compression zone, and holding at 190°C to 200°C at the metering zone and die. Screw designs with a compression ratio of 2.5:1 to 3.5:1 and a Maddock or pineapple mixing section are recommended for homogenizing fillers and blowing agents; excessive screw speeds above 120 rpm can generate shear heating above 210°C and initiate acetic acid release from the vinyl acetate comonomer. The liberated acetic acid is detectable as a sharp odor and can corrode downstream metal surfaces and cause bubble collapse in foam. In injection molding, cylinder temperatures from 170°C to 200°C and mold temperatures from 20°C to 40°C are typical; clamp force requirements follow the flow length and wall thickness but are generally lower than those for semicrystalline polypropylene at the same MFR because of the copolymer’s lower melt viscosity. Injection molders have observed that a holding pressure of 50–80 MPa and a back pressure of 0.5–1.0 MPa are adequate for many small-to-medium parts; high cushion settings above 4 mm can increase residence time and promote thermal degradation. Pre-drying is not required when pellets are stored in sealed silos below 60% relative humidity; if surface moisture exceeds 0.05 wt%, a 60–70°C desiccant or hot-air drying step for 2–4 hours prevents steam-related surface defects and dimensional instability. Production-scale foam lines have reported that melt pressure variation exceeding ±5 bar at a fixed screw speed can indicate non-uniform blowing-agent dispersion; when such variation appears, the recommendation is to reduce masterbatch feed rate or increase barrel residence time before adjusting the base temperature profile.
Foam expansion with chemical blowing agents is among the primary commercial uses of HANWHA EVA 1826. The compound is typically prepared in an internal mixer or open mill at 100–110°C, with azodicarbonamide at 2.0–4.0 phr, dicumyl peroxide at 0.6–1.2 phr as crosslinking initiator, zinc oxide at 0.5–1.5 phr as activator, and stearic acid at 0.5–1.0 phr as processing aid. The mixing cycle is controlled to discharge before the half-life temperature of dicumyl peroxide is reached; otherwise, premature crosslinking creates hard gels that appear as surface bumps in the calendered sheet. The compound is then calendered to sheet, pre-formed into pre-foamed blanks, and expanded in a two-stage press system at 150–170°C. The 18 wt% vinyl acetate content provides sufficient polarity for filler wetting and enough amorphous character to permit expansion ratios between 1.3 and 1.8 while retaining ultimate elongation. HANWHA EVA 1826 is distinguishable from lower-VA grades in shoe sole foaming because lower-VA grades require higher activator loadings to achieve equivalent filler dispersion, while higher-VA grades can generate excessive tack and longer demolding times. In footwear midsoles, the grade is used in formulations targeting 0.20–0.30 g/cm³ finished foam density, with compression set at 50% deflection typically below 35% after 24 hours at room temperature. Published data for this specific configuration is limited; therefore, producers are advised to validate compression-set behavior against ASTM D395 Method B on production-slab samples before locking formulation. The same copolymer can be injection-molded directly as unfoamed flex items, where its Shore A 88 hardness and 800% elongation provide flexural fatigue resistance. For wire and cable sheathing, EVA 1826 may be compounded with aluminum trihydrate and magnesium hydroxide for low-smoke halogen-free formulations, although the producer does not list a specific limiting oxygen index for the base resin.
Extrusion coating and adhesive lamination represent a secondary application window. The 18 wt% vinyl acetate content lowers the sealing initiation temperature relative to pure polyethylene and provides adhesion to aluminum foil and polyester film; however, producers report that web speed is limited by draw resonance at melt temperatures above 200°C. The melt mass-flow rate of 2.6 g/10 min is high enough for thin-coat weight control down to 15 g/m² with chill-roll temperatures near 15°C, but lower than coating-specific EVA grades with MFR above 5 g/10 min. In adhesive compounding, EVA 1826 is dissolved or melt-mixed with tackifier resins and waxes; its vinyl acetate side groups influence solubility parameter matching with rosin ester tackifiers and increase open time compared with LDPE. Published data for specific coating configurations is limited.
Relative to other HANWHA EVA grades, EVA 1826 occupies the intermediate position between high-melt-strength extrusion grades and high-flow injection grades. HANWHA EVA 1810, with a nominal 18 wt% vinyl acetate content and 1.0 g/10 min MFR, delivers greater melt tension and bubble stability in blown-film and heavy-gauge sheet, but requires higher motor amperage and slower screw recovery. HANWHA EVA 1530, with 15 wt% vinyl acetate and a nominal 3.0 g/10 min MFR, flows more readily into thin-wall cavities but sacrifices polar adhesion and low-temperature flexibility. HANWHA EVA 1315, at 13 wt% vinyl acetate and 1.5 g/10 min MFR, is stiffer and less tacky, making it preferable for rigid packaging applications where pliability is secondary. The table below summarizes these distinctions.
| Grade | Nominal vinyl acetate content | Nominal melt mass-flow rate (190°C, 2.16 kg) | Differentiating process characteristic |
|---|---|---|---|
| HANWHA EVA 1826 | 18 wt% | 2.6 g/10 min | Balanced fluidity and polarity for foam and injection molding |
| HANWHA EVA 1810 | 18 wt% | 1.0 g/10 min | Higher melt strength for blown film and sheet |
| HANWHA EVA 1530 | 15 wt% | 3.0 g/10 min | Higher flow for thin-wall molding, lower polarity |
| HANWHA EVA 1315 | 13 wt% | 1.5 g/10 min | Stiffer, lower-tack grade for rigid packaging |
From a compliance standpoint, ethylene-vinyl acetate copolymers are covered under FDA 21 CFR 177.1350 for indirect and direct food-contact uses when the finished article complies with the specified extractables and end-use limitations. The European framework for plastic materials and articles intended to come into contact with food is Regulation (EU) No 10/2011; EVA copolymers are generally subject to overall migration limits of 10 mg/dm² and, where applicable, specific migration limits for vinyl acetate monomer. HANWHA EVA 1826 is supplied under a generic EU declaration confirming that it does not intentionally contain substances of very high concern above 0.1 wt% as defined by REACH, and that it falls outside the scope of RoHS Directive 2011/65/EU when used in electrical and electronic equipment because it is not an electrical component. The grade is not supplied with USP Class VI or ISO 10993 biological certification; therefore, it is not qualified for long-term implantable medical-device contact. For food-contact use, the converter must verify that the final formulation, including blowing agents, antioxidants, and colorants, meets the migration limits under the intended time-temperature conditions. The copolymer decomposes by acetic acid elimination above 220°C; therefore, it is not recommended for processing at melt temperatures above 230°C or for continuous service above 80°C under load. Avoid combination with amine-based additives due to premature ester aminolysis and acid-base reactions that reduce molecular weight stability.
Storage stability is best maintained in closed, moisture-resistant packaging at ambient temperature. Prolonged storage above 40°C can increase pellet blocking, particularly in warm climates; floor storage of opened bags should be rotated within 12 months. If outdoor storage cannot be avoided, the pellets should be kept under opaque covers and away from direct sunlight to minimize surface oxidation and yellowing. Silos handling HANWHA EVA 1826 should be purged with dry air and equipped with aeration to prevent moisture condensation; conveying line velocities above 25 m/s may generate fines and angel hair, which affect downstream gravimetric feeding accuracy. No specific shelf-life limit is stated by the supplier, but end users are advised to verify pellet color and MFR after any storage period exceeding 12 months.
