| HS Code | 494757 |
| Chemical Name | Ethylene Vinyl Acetate Copolymer |
| Va Content | 18 wt% |
| Melt Flow Index | 2.6 g/10 min |
| Density | 0.939 g/cm³ |
| Melting Point | 88 °C |
| Vicat Softening Temperature | 70 °C |
| Tensile Strength | 20 MPa |
| Elongation At Break | 760% |
| Hardness | 96 Shore A |
| Brittleness Temperature | -76 °C |
As an accredited HANWHA EVA 1826 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Hanwha EVA 1826 ethylene vinyl acetate copolymer is supplied as free-flowing pellets in 25 kg multi-wall paper bags, palletized and wrapped. |
| Container Loading (20′ FCL) | Load HANWHA EVA 1826 into clean, dry 20′ FCL, palletized and secured, protected from heat, moisture, and direct sunlight. |
| Shipping | HANWHA EVA 1826 is shipped as solid pellets in moisture-resistant multiwall paper bags or woven polypropylene bags, typically 25 kg each, on pallets. Store in a cool, dry, ventilated area away from direct sunlight, heat, and oxidizers. Avoid sharp objects and excessive stacking to prevent bag rupture. |
| Storage | Store HANWHA EVA 1826 in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep containers tightly sealed and protect from moisture and humidity. Avoid stacking excessively to prevent deformation. Maintain moderate temperatures and good air circulation. Under these conditions, the product remains stable with a suitable shelf life. |
| Shelf Life | Store in a cool, dry place away from sunlight and heat. Shelf life is typically 12 months from date of manufacture. |
The application window for HANWHA EVA 1826 derives from a nominal vinyl acetate monomer content of 18 wt% and a melt flow rate of 2.6 g/10 min measured at 190°C under 2.16 kg load in accordance with ASTM D1238-20. Density is published at approximately 0.940 g/cm³ by ASTM D1505-18 or ISO 1183-1:2019, and the grade is assigned to olefin-based flexible converting rather than to optically transparent photovoltaic encapsulation, where vinyl acetate content above 28 wt% is required. The following scenarios isolate the downstream tracks where the combination of medium melt strength, low-temperature flexibility, and filler acceptance is technically consequential.
In crosslinked chemically blown footwear foam, EVA 1826 functions as the low-VA backbone resin that controls green strength before crosslinking and sets the lower Shore A hardness limit in demolded parts. A representative production formulation uses EVA 1826 at 70–100 phr, blending optionally with 20–30 phr of an EVA grade containing 26–28 wt% vinyl acetate when the target hardness falls below Shore A 55. Calcium carbonate is loaded at 10–25 phr, azodicarbonamide at 2.0–3.5 phr, dicumyl peroxide at 0.6–1.0 phr as a 40% active concentrate, zinc oxide at 0.8–1.5 phr, and zinc stearate at 0.4–0.8 phr. The addition ratio is constrained by gas yield: below 2.0 phr azodicarbonamide, expansion falls below 1.3× in open molds, while above 3.5 phr, dense skin layers tend to collapse during decompression. Compliance screening for European footwear consignments follows REACH (EC) No 1907/2006 Annex XVII restrictions on phthalates and polycyclic aromatic hydrocarbons in consumer articles; articles marketed as children’s goods are additionally screened under EN 71-3:2019+A1:2021 for migration of soluble elements. Mechanical acceptance of the foam relies on ASTM D638-14 for tensile properties, ASTM D2240-15e1 for durometer hardness, and ISO 815-1:2019 for compression set after 22 h at 50°C.
Compounding is executed in an internal mixer with ram pressure at 0.6–0.8 MPa and a drop temperature of 110–115°C to avoid premature peroxide crosslinking. The mixed batch is sheeted on a two-roll mill at 90–100°C, then pelletized through a single-screw extruder with L/D 20:1 and die-face cutting, keeping melt temperature below 95°C. In compression molding, the foam is cured at 165–175°C for 7–12 min; the thermal overlap between dicumyl peroxide decomposition at 150–170°C and azodicarbonamide decomposition at 195–205°C forces a heating ramp of 3–5°C/min and mold venting in the final 20 s. Process failure on production lines appears as gas blowholes when the ramp exceeds 6°C/min or as partial undercure when lower platen temperature deviates by more than ±5°C. Terminal product types include die-cut midsoles, injection-molded slipper soles, wedge outsoles, and foam sheets for insoles.
The selection of EVA 1826 in low-smoke zero-halogen cable jacketing is driven by its ability to accept high loadings of alumina trihydrate and magnesium dihydrate without abrupt melt fracture. A typical compound sets EVA 1826 at 40–60 wt% of the polymer phase, linear low-density polyethylene at 20–35 wt%, an EVA grade with 33 wt% vinyl acetate at 5–15 wt%, and a vinylsilane coupling agent at 0.3–0.8 wt%; total flame-retardant filler loading is 120–160 phr, with an ATH-to-MDH ratio between 70:30 and 50:50. If EVA 1826 falls below 35 wt% of the polymer phase, tensile elongation at break after aging tends to drift below 150%, while above 60 wt% the compound develops die-deposit on extrusion heads and raises melt pressure by 12–18%. Compliance for the final cable includes flame propagation testing to IEC 60332-1-2, halogen acid gas determination to IEC 60754-1, pH and conductivity of combustion gases to IEC 60754-2, and smoke density measured under IEC 61034-2; compound suppliers also register under REACH (EC) No 1907/2006 and may document SVHC content below 0.1 wt% per article.
Production-scale compounding is performed on a co-rotating twin-screw extruder with L/D 44:1–52:1 and a side-stuffer located at barrel 6–8 for filler introduction. Barrel temperatures are set from 120°C at the feed zone to 160°C at the die, screw speed is maintained at 250–400 rpm, and specific mechanical energy is monitored at 0.18–0.25 kWh/kg to avoid over-dispersion that reduces flame-retardant particle size and increases viscosity. Pellets are cut underwater with water temperature at 15–20°C; after drying at 70–80°C for 3–4 h, the compound is extruded onto copper conductors on a single-screw extruder with L/D 25:1, barrier screw, and melt temperature 145–155°C. Terminal product types include building wire jackets, control cable sheathing, appliance wiring insulation, and low-smoke busbar coating profiles.
When injection molding flexible grips, suction cups, cap seals, and push-in fasteners, EVA 1826 is processed as a neat resin or in a blend with low-density polyethylene at 10–30 wt% to raise cavity fill speed. The recommended EVA 1826 addition ratio in soft-touch articles is 80–100 wt%, with optional styrene-ethylene-butylene-styrene block copolymer at 2–5 wt% or ethylene-propylene rubber at 5–15 wt% for flex resistance. Molding is carried out on hydromechanical clamping units with clamp force between 80 t and 120 t for 8–16 cavity tools. Barrel zones are profiled from 130°C to 180°C, mold temperature is held at 20–35°C, injection pressure is set at 60–100 MPa, and hold pressure at 30–50 MPa. Residence-time control is the primary operational boundary: after 2 h at 180°C, the melt flow rate of EVA 1826 can shift by 0.2–0.4 g/10 min, producing sink marks and dimensional variability; screw recovery speed is therefore limited to 80–120 rpm with decompression of 2–5 mm. For food-contact cap seals and repeat-use gaskets, the molded articles fall under FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers and, in the European Union, under (EU) No 10/2011 with an overall migration limit of 10 mg/dm² for plastics intended for food contact. Consumer articles imported as toys are tested to EN 71-3:2019+A1:2021 for elemental migration and must comply with RoHS 2011/65/EU Annex II limits of 0.1 wt% for lead, mercury, and hexavalent chromium, and 0.01 wt% for cadmium. Terminal product types include screwdriver grips, appliance feet, suction cups, cap liners, shock-absorbing connector covers, and child-resistant spout seals.
Masterbatch producers select EVA 1826 when a polyolefin-compatible carrier must wet and disperse carbon black, organic pigments, or hindered amine light stabilizers in blown film, cast film, and extrusion coating operations. In a black masterbatch, EVA 1826 is used at 55–75 wt%, carbon black at 25–45 wt%, and a processing aid at 1–3 wt%; additive masterbatches for UV stabilization use EVA 1826 at 40–60 wt%, the active additive at 30–50 wt%, and low-density polyethylene at 5–10 wt% to reduce pellet tack. Compounding is run on a high-torque co-rotating twin-screw extruder with L/D 36:1–48:1, atmospheric and vacuum venting, barrel temperatures 110–160°C, and screw speeds 300–600 rpm. The practical upper limit for carbon black loading is reached when screen pack pressure against 50/100/50 mesh layering exceeds 4–8 MPa; above that point, the automatic screen changer triggers too frequently for continuous strand pelletizing. The resulting masterbatch is let down at 2–6 wt% in polyethylene film or injection molding. Compliance includes REACH (EC) No 1907/2006 registration for imported formulations, heavy metals limits under EU Packaging Directive 94/62/EC Article 11 for packaging applications, and, where the masterbatch is used in food-contact films, migration testing under (EU) No 10/2011 with specific migration limits for the contained additive. Published plant-scale acceptance data for EVA 1826 in high-loaded carbon black masterbatch remain limited compared with generic EVA 18 wt% carriers, so the upper addition limit should be confirmed by screen pack pressure trends rather than by fixed filler percentage. Terminal product types include black masterbatch for agricultural and construction film, color masterbatch for caps and closures, and UV-stabilizer masterbatch for extrusion-coated packaging.
For extruded low-temperature gaskets, edge trims, and protective profiles, EVA 1826 is introduced at 60–100 wt% with slip and anti-block masterbatch at 2–4 wt% and, where surface friction is specified, erucamide at 0.1–0.3 wt%. The single-screw extruder for a 45 mm screw is configured with L/D 25:1, compression ratio 2.5:1, barrel temperatures 120–165°C, adapter and die temperatures 165–175°C, and melt pressure at the breaker plate 5–9 MPa. Output on this screw diameter is held between 40 kg/h and 80 kg/h; at screw speeds above 110 rpm, the shear rate enters a regime where EVA 1826 exhibits melt fracture and surface shark-skin on the extrudate. Downstream sizing uses a vacuum water tank at 10–20°C and laser diameter control with tolerance ±0.05 mm. For building gasket profiles, dimensional tolerance is assessed under ISO 3302-1:2014, and for automotive interior edge trims the material is screened against REACH (EC) No 1907/2006 and RoHS 2011/65/EU Annex II restrictions. The use of EVA 1826 as the sole resin in outdoor gaskets is operationally limited above 60°C continuous service because the Vicat softening point of the grade is approximately 67°C under ASTM D1525-17e1; where higher heat resistance is required, a crosslinkable compound or blend with ethylene-propylene rubber should replace the neat EVA. Terminal product types include refrigerator door seals, appliance gaskets, automotive door edge protectors, flexible corner profiles, and industrial edge trim.
The addition of EVA 1826 to paving-grade bitumen modifies the softening point and low-temperature deformation behavior of polymer-modified bitumen for road paving and waterproofing membranes. EVA 1826 is added at 3–6 wt% of the total blend, typically with bitumen having penetration grade 60/70 or 80/100 and ring-and-ball softening point between 45°C and 50°C. The addition ratio is bounded at the low end by insufficient rutting resistance: below 3 wt% EVA 1826, the ring-and-ball softening point gain is often less than 5°C; above 6 wt%, the 135°C rotational viscosity can exceed 3 Pa·s, which compromises pumping and spraying on paving sites. Production uses a high-shear rotor-stator mixer at 180–190°C for 1.5–2.5 h with rotor tip speed above 10 m/s; the dispersion is then transferred to a low-shear paddle tank for maturation. Compliance for road-grade polymer-modified bitumen follows the specification framework of EN 14023:2010, while the base bitumen is tested under EN 12591; roofing membranes using EVA 1826-modified bitumen are tested to EN 13707 for reinforced bitumen sheets. Published plant-scale data for EVA 1826-specific polymer-modified bitumen are limited compared with generic EVA 18 wt% grades, so storage stability must be verified by the EN 13399 storage stability test rather than assumed from vinyl acetate content alone. Terminal product types include heavy-duty road polymer-modified bitumen, waterproofing membranes, bridge deck mastics, and bituminous sealant sheets.
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Hanwha EVA 1826 is a pelletized ethylene vinyl acetate copolymer produced by Hanwha Chemical Corporation. The grade designation 1826 encodes a nominal vinyl acetate content of 18 wt% and a nominal melt index of 2.6 g/10 min as measured by ASTM D1238-20 at 190 °C with a 2.16 kg load. Pellet density is approximately 0.940 g/cm³ when determined in accordance with ASTM D1505-18 or ISO 1183-1:2019. This grade occupies a medium-flow, medium-polarity position between low-VA film grades and higher-VA adhesive or encapsulant grades. The polar acetate side groups disrupt ethylene chain crystallinity, lowering the melting point and increasing adhesion to polar surfaces compared with LDPE homopolymer. In contrast to EVA grades containing 28 wt% or 33 wt% vinyl acetate, HANWHA EVA 1826 retains more crystalline structure, higher modulus, lower surface tack, and better creep resistance at elevated temperatures. It is specified for injection moulding, compounding, foam extrusion, masterbatch carrier resin, and hot-melt adhesive modification.
| Property | Typical value | Test method |
|---|---|---|
| Vinyl acetate content | 18 wt% | Internal calibrated FTIR/TGA method |
| Melt index | 2.6 g/10 min | ASTM D1238-20 / ISO 1133-1:2022 |
| Density | 0.940 g/cm³ | ASTM D1505-18 / ISO 1183-1:2019 |
| Tensile strength at break, compression moulded | ~15 MPa | ISO 527-2:2012 / ASTM D638-14 |
| Elongation at break | ~750% | ISO 527-2:2012 |
| Shore A hardness | ~93 | ISO 868:2003 |
| Melting peak | ~84 °C | ISO 11357-3:2018 |
| Vicat softening point | ~64 °C | ISO 306:2013 / A50 |
The tabulated values are representative of published technical data and are not batch release limits. Mechanical values depend on specimen preparation, conditioning at 23 °C and 50% RH for 48 h, and test speed. Current lot certification should be obtained for any specification-bound application.
The incorporation of 18 wt% vinyl acetate into the polyethylene chain introduces a random distribution of polar acetate groups. These groups reduce the length of crystallizable ethylene sequences, lower the melting point, and suppress crystallinity to a level that improves environmental stress crack resistance and low-temperature brittleness relative to LDPE homopolymer. The glass transition of EVA remains below -20 °C, so EVA 1826 maintains flexibility at refrigerator temperatures; however, the crystalline fraction still provides enough chain-network integrity to resist creep at 60 °C. Compared with EVA grades containing 28 wt% or 33 wt% vinyl acetate, EVA 1826 has higher room-temperature modulus, lower surface tack, and less compatibility with highly polar rosin ester tackifiers. It also has lower gas solubility for CO₂ and N₂, which reduces expansion efficiency in direct-gas foaming but improves dimensional stability after expansion. The melt index of 2.6 g/10 min places EVA 1826 above low-flow blow-moulding grades and below high-flow injection grades; this flow position favors injection moulding, medium-speed profile extrusion, and continuous compounding where melt temperature must be controlled below 210 °C.
| Grade | Nominal VA content | Nominal melt index | Nominal density | Primary positioning |
|---|---|---|---|---|
| HANWHA EVA 1315 | 15 wt% | 1.5 g/10 min | 0.935 g/cm³ | Higher melt strength; blown film, highly filled masterbatch, coextrusion |
| HANWHA EVA 1826 | 18 wt% | 2.6 g/10 min | 0.940 g/cm³ | Medium flow and polarity; injection moulding, foam, compounding, hot-melt blending |
| HANWHA EVA 2825 | 28 wt% | 2.5 g/10 min | 0.950 g/cm³ | Higher clarity and flexibility; encapsulant, adhesive, high-VA foam |
On production-scale twin-screw compounding lines with L/D ratios between 48:1 and 52:1, EVA 1826 is processed at barrel set temperatures of 150 °C to 190 °C. Viscous dissipation at screw speeds above 350 rpm can increase actual melt temperature to 200–215 °C even when the final barrel zone is set below 190 °C. The acetate ester begins measurable thermal deacetylation in this upper range; acetic acid is detectable in vacuum vent condensate, and long residence times above 220 °C generate discoloration and crosslinked gel particles. Continuous extrusion should therefore maintain melt temperature at 160–205 °C and limit residence time above 210 °C to less than 8 min. Devolatilization sections should operate at 80–95 kPa differential pressure to remove acetic acid and moisture. Hopper drying at 60–70 °C for 2–4 h is recommended when ambient relative humidity exceeds 60% to prevent surface pitting and feed throat surging. The resin should not be processed in direct contact with strong alkali, primary amines, copper-based stabilizers, or bronze melt-path components where prolonged high-temperature residence is anticipated. Localized alkalinity accelerates acetate group loss. On injection moulding machines with clamp force between 80 tonnes and 180 tonnes, the grade runs at melt temperatures of 170–195 °C, mould temperatures of 20–40 °C, injection pressure of 50–80 MPa, holding pressure of 30–50 MPa, and cooling time of 15–30 s for wall thicknesses of 2–4 mm. Rapid cooling reduces crystallinity and increases flexibility but can increase post-mould shrinkage; draft angles of 1.5–2.5° and polished or PTFE-coated cavity surfaces reduce release forces caused by the polar acetate group.
Hot-melt adhesive formulations based on EVA, hydrocarbon tackifier, and paraffin wax respond to VA content and melt index through changes in open time, cohesive strength, and adhesion to corrugated board. Substituting EVA 1826 for EVA 2825 reduces polar interaction with uncoated paper and decreases low-temperature peel, but improves creep resistance at 60 °C because the higher crystalline fraction acts as a physical network. The lower VA content also reduces compatibility with fully esterified rosin esters and may require a higher hydrocarbon resin loading to maintain wet-out on recycled board. In continuous hot-melt mixing at 160–180 °C, EVA 1826 disperses more slowly in paraffin wax than a 28 wt% VA grade of equivalent melt index; pre-wetting the resin with a portion of the tackifier at 150 °C for 10 min minimizes phase separation and visual haze. Formulations containing 30–40 phr EVA 1826, 40–50 phr C5/C9 hydrocarbon resin, and 20–30 phr paraffin wax typically produce ring-and-ball softening points between 85 °C and 105 °C; exact values depend on resin softening point, oil content, and wax melt distribution. Viscosity at 180 °C is measured with a Brookfield Thermosel spindle 27; application viscosity for case and carton sealing is generally kept between 500 mPa·s and 2000 mPa·s. Heat-fail temperature is evaluated by ASTM D4498, and T-peel adhesion is evaluated by ASTM D1876. Because EVA 1826 has lower VA content than EVA 2825, the tacky window is typically shortened by 10–20% under identical formulation conditions, while elevated-temperature creep resistance improves. Published product-specific data for this formulation space is limited; laboratory-scale viscosity and peel testing are required before converting a production line from EVA 2825 to EVA 1826.
Chemically foamed EVA sheet for footwear midsoles is one of the most demanding applications for EVA 1826. In a typical batch mixing route, EVA 1826 is compounded on a tangential Banbury or intermeshing internal mixer at fill factors of 0.75–0.85 and discharged at 95–105 °C. The formulation includes an azodicarbonamide-bearing masterbatch at 15–20 phr, corresponding to 3–5 phr active azodicarbonamide, dicumyl peroxide at 0.8–1.5 phr, zinc oxide at 0.5–1.0 phr, zinc stearate at 0.5–1.0 phr, and calcium carbonate at 5–15 phr. The matched batch is sheeted on a two-roll mill at 90–105 °C and converted into preforms. Vulcanization and foam expansion are carried out in multi-daylight hydraulic presses at 165–175 °C. Cure rheology measured by an oscillating disc rheometer at 170 °C should reach 90% of maximum torque within 8–12 min; shorter cycles leave under-cured cell walls and higher compression set. At a target foam density of 0.15–0.20 g/cm³, EVA 1826 provides faster cavity filling than lower-MI EVA 1315 but may produce slightly larger cell diameter and lower split tear resistance in thick sections. To improve melt strength and gas retention, processors often blend EVA 1826 with 10–20% EVA 1315 or LDPE. Physical properties after expansion are assessed by density per ISO 845, cell size distribution per ASTM D3576, compression set per ISO 1856:2018 after 50% compression for 6 h at 23 °C, and rebound resilience per ISO 8307. Compression set values of 35–55% and rebound resilience of 40–50% are common for EVA 1826-based foam at 0.18 g/cm³; higher-VA grades such as EVA 2825 reduce hardness and increase rebound, while lower-VA grades such as EVA 1315 increase modulus but may crack under high elongation in the expanded state.
In coextruded film and seal-layer applications, EVA 1826 is typically used as a blend partner with LDPE at 10–20 wt% addition. The VA comonomer lowers heat-seal initiation temperature by approximately 5–10 °C and improves dart impact strength as measured by ASTM D1709. Environmental stress crack resistance, measured by ASTM D1693, is also improved relative to unmodified LDPE. Compared with EVA 2825, the 18 wt% VA grade generates a less tacky seal layer, reducing blocking during roll winding and slitting, but the low-temperature seal strength under frost conditions is inferior. EVA 1826 is not a photovoltaic encapsulant grade; it has higher crystalline haze and lower crosslinked optical coupling than EVA 2825 or EVA 2843, and should not be substituted directly in solar module lamination lines. For packaging applications, hot-tack and seal strength should be evaluated by ASTM F88 and internal hot-tack tests at the intended line speed and seal jaw temperature because the narrow high-speed window is structure-dependent.
The primary thermal degradation route for EVA is acetic acid elimination from the vinyl acetate units, leaving conjugated double bonds along the polyethylene backbone. This deacetylation reaction accelerates above 220 °C and is autocatalytic because the generated acetic acid promotes further ester cleavage. Moisture, residual alcohols, and certain transition metal ions accelerate the process, whereas phenolic antioxidants and phosphite stabilizers primarily retard oxidative chain scission rather than deacetylation. Therefore, thermal residence time and melt temperature remain the key control variables. The acetic acid liberated during processing is corrosive to carbon steel tooling; downstream vent ports, die lips, and take-off equipment should be fabricated from 316L stainless steel or hard chrome-plated surfaces. Nitrogen blanketing of drying hoppers is not required below 70 °C, but closed vacuum vent lines should be monitored for acetic acid adsorption and pH change. Published kinetic data specific to HANWHA EVA 1826 is limited; general EVA degradation studies indicate deacetylation rates increase sharply above 210 °C, and the reaction rate approximately doubles for every 10–15 °C increase in this region. Operators should set high-temperature alarms at 215 °C on melt thermocouples and initiate automatic screw-speed reduction when the alarm threshold is exceeded to prevent gel formation and lot rejection.
Regulatory compliance for EVA 1826 generally falls within the manufacturer’s REACH registration dossier and the applicable provisions of 21 CFR 177.1350 for ethylene-vinyl acetate copolymers used as indirect food-contact components. End-use migration testing under the intended conditions of use remains necessary because the regulation includes total extractives limitations and additive restrictions. RoHS 2011/65/EU compliance is typically declared for lead, cadmium, mercury, hexavalent chromium, PBB, and PBDE in the unpigmented base resin; however, color concentrates and flame-retardant masterbatches must be evaluated separately. The resin is not intended for implantable medical devices or for applications requiring UL 94 V-0 flame performance without a separate flame-retardant system. No ISO 10993 biocompatibility statement should be inferred for the neat resin without additional testing. For incoming material release, lot certificates should confirm nominal VA content by the supplier’s calibrated method, melt index by ISO 1133-1:2022, and density by ISO 1183-1:2019. Storage below 40 °C in sealed containers away from direct sunlight is recommended, and opened bags should be consumed within 8 h or resealed to prevent dust pickup and moisture condensation. In masterbatch carrier applications, EVA 1826 can accept high calcium carbonate filler loadings in twin-screw compounding, but its lower VA content means that pigment wetting and polar wax dispersion are less effective than in EVA 2825 or EVA 3343; the grade is therefore selected when higher stiffness and lower surface tack of the final compound are desired.
