| HS Code | 878130 |
| Manufacturer | Hanwha |
| Product Name | EVA 1834 |
| Product Type | Ethylene-Vinyl Acetate Copolymer |
| Vinyl Acetate Content | 18 wt% |
| Melt Flow Index | 34 g/10 min |
| Density | 0.938 g/cm³ |
| Vicat Softening Point | 68 °C |
| Melting Point | 87 °C |
| Tensile Strength | 10 MPa |
| Elongation At Break | 700% |
| Hardness | 91 Shore A |
| Brittleness Temperature | -70 °C |
As an accredited HANWHA EVA 1834 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | HANWHA EVA 1834 is supplied in 25 kg net moisture-proof polyethylene-lined kraft bags, palletized and shrink-wrapped for safe transport. |
| Container Loading (20′ FCL) | 20′ FCL: 25kg bags on pallets, around 20 metric tons per container, safe, dry, and well-secured for HANWHA EVA 1834. |
| Shipping | HANWHA EVA 1834 is shipped as solid pellets in moisture-proof, sealed bags or bulk containers. Transport in clean, dry holds or containers, protected from direct sunlight, excessive heat, and physical damage. Store in a cool, ventilated area. No special hazard classification for general freight, but keep away from ignition sources during handling. |
| Storage | Store Hanwha EVA 1834 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 humidity and avoid stacking near oxidizing materials. Follow local regulations, and use proper handling procedures to minimize dust accumulation. |
| Shelf Life | Shelf life is typically 24 months from production when stored in original packaging in a cool, dry place. |
When HANWHA EVA 1834 is substituted into halogen-free flame-retardant (HFFR) sheathing compound, the nominal 18 wt% vinyl acetate content and nominal melt flow rate of 3.4 g/10 min under ISO 1133-1:2011 at 190 °C/2.16 kg impose a compound design constrained by ATH dehydration onset near 180–190 °C. A production-scale co-rotating twin-screw compounding line with L/D ratio 40:1 is typically operated with barrel temperatures from 140 °C at feed to 170 °C before die, screw speed 300–500 min⁻¹, and downstream side-feed for ATH to limit residence time below 60 s; strand pelletizing is selected rather than hot die-face pelletizing to avoid steam-induced vacuole formation. Representative compound formulation: EVA 1834 45–60 phr, LLDPE 20–30 phr, ATH 120–180 phr, MDH 0–40 phr, zinc borate 3–8 phr, antioxidant 0.5–1.2 phr, silicone processing aid 1–3 phr. The compounded pellets are subsequently extruded as a cable sheath on a single-screw extruder with barrier screw and L/D 25:1, compression ratio 2.5:1, melt temperature 150–170 °C, and crosshead die pressure 100–200 bar; process alarms are set at 175 °C melt temperature because ATH releases chemically bound water in the 180–190 °C range, causing surface porosity and loss of elongation. Terminal products include LSZH sheathed power, control, and signal cables for rail transit tunnels, data center risers, and marine vessel internal wiring.
| Standard | Parameter | Acceptance threshold |
|---|---|---|
| IEC 60754-2 | Acid gas pH | ≥ 4.3 |
| IEC 60754-2 | Conductivity | ≤ 10 µS/mm |
| IEC 61034-2 | Smoke transmittance | ≥ 60% |
| IEC 60332-1-2 | Vertical flame spread | Self-extinguishing below top mark |
| ISO 4589-2 | Limiting oxygen index | ≥ 30% O₂ |
EVA 1834 is used as the main resin in chemically crosslinked closed-cell midsole foam, but the moderate MFR of 3.4 g/10 min measured per ISO 1133-1:2011 requires careful balancing of azodicarbonamide decomposition, zinc oxide kicker level, and dicumyl peroxide cure. In injection expansion molding, the formulation is often: EVA 1834 65–100 phr, higher-VA EVA with nominal 28 wt% VA 0–35 phr, azodicarbonamide 1.5–3.2 phr, dicumyl peroxide 0.6–0.9 phr, ZnO 1.0–1.5 phr, stearic acid 0.5–0.8 phr, and CaCO₃ 5–15 phr. The ZnO kicker lowers ADC decomposition onset from near 200 °C to below 170 °C, allowing DCP to initiate crosslinking at 140–150 °C before the gas evolution peak; if ZnO is below 0.8 phr, the uncombined gas bubbles collapse during mold opening, and if DCP exceeds 0.9 phr, viscosity rise suppresses expansion and produces density above 0.35 g/cm³. Production equipment includes an internal mixer at 75–110 °C, an open two-roll mill at 80–90 °C, and either a hydraulic compression press at 155–165 °C under 150–180 kg/cm² for 7–12 min or an injection-foaming machine with injection temperature 170–190 °C, mold temperature 25–40 °C, and holding pressure 80–120 bar. Finished foam is tested to ASTM D2240 Shore C hardness, ISO 845 apparent density, and ASTM D395-16 compression set; REACH 1907/2006 Annex XVII PAH limits and phthalate restrictions apply to the molded article. Terminal products are running shoe midsoles, sandal footbeds, orthotic wedges, and safety footwear cushioning.
Blending EVA 1834 into the sealant layer of coextruded film lowers seal initiation temperature when the VA comonomer disrupts polyethylene crystallinity; the grade is incorporated at 20–35 wt% into an LLDPE metallocene base with MFR 1.0 g/10 min for cast or blown film. Sealant-layer extrusion uses a 40–60 mm single-screw extruder with L/D 24:1–30:1, melt temperature 180–210 °C, cast die gap 0.8–1.5 mm, or blown-film BUR 2.0–2.5. Compliance for food contact is established under FDA 21 CFR 177.1350 and EU Regulation 10/2011 with overall migration below 10 mg/dm²; the final sealant web is tested for seal strength by ASTM F88/F88M-21 and hot-tack by ASTM F1921-12. Terminal products include frozen vegetable pouches, liquid packaging sealant membranes, and medical device overwrap requiring low-temperature seal initiation.
In compression-molded anti-fatigue mat production, EVA 1834 is batch-mixed in a Banbury internal mixer with EVA 28 wt% VA at 0–30 phr, ADC 2.5–3.5 phr, DCP 0.7–0.9 phr, ZnO 1.0–1.8 phr, CaCO₃ 15–25 phr, and stearic acid 0.5–1.0 phr; the mix is then transferred to an open mill at 80–100 °C, calendered to a preform thickness of 8–25 mm, and foamed in a multi-daylight hydraulic press at 155–165 °C under 100–150 bar for 10–15 min. The foamed sheet is cold-pressed to 30–40 °C at 5–10 bar to stabilize cell geometry; density is controlled within ±0.02 g/cm³ by monitoring preform weight, and elongation at break is checked per ASTM D638-22 Type IV specimen with acceptance above 200%. Mats marketed for child contact fall under EN 71-3:2019 migration limits for nineteen elements and REACH Annex XVII entry 50 PAH limits; industrial matting is evaluated by ISO 845 and ASTM D395-16 compression set. Terminal products include gym mats, anti-fatigue kitchen flooring, yoga blocks, and aquatic exercise boards.
Within automotive trim foam lines where fogging limits force substitution of EPDM, EVA 1834 is introduced into closed-cell interior trim foam at 50–70 phr with LDPE 15–25 phr, EPDM 10–20 phr, ADC 1.5–3.0 phr, DCP 0.5–0.8 phr, zinc stearate 0.5–1.2 phr, and antioxidant 0.3–0.8 phr to limit volatile condensate and odor. The compound is processed on a tandem extrusion line: a 24:1 L/D twin-screw first stage at 120–150 °C disperses blowing and curing agents, and a cooling single-screw second stage lowers the melt to 105–110 °C before the die; head pressure above 80 bar prevents premature nucleation. The extruded foam plank is cut and thermoformed at 130–150 °C into three-dimensional door pad cores and headliner edge fillers. Flammability is evaluated per ISO 3795 with maximum burning rate 100 mm/min; VOC and fogging per VDA 278 and DIN 75201-B with condensate limits below 2 mg; interior air emission limits follow ISO 12219-1 or the applicable OEM specification. Terminal products include door trim padding, instrument panel knee pads, seat back panels, and headliner edge fillers.
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The product identified as HANWHA EVA 1834 is a neat ethylene-vinyl acetate copolymer pellet supplied for melt-compounded applications. The designation encodes a nominal vinyl acetate content of 18% by mass and a nominal melt flow rate of 3.4 g/10 min when measured under ASTM D1238 at 190 °C with a 2.16 kg load. Density determined under ISO 1183-1 is typically 0.940 g/cm³ at 23 °C, and the differential scanning calorimetry melting peak is observed near 84 °C using ASTM D3418 at 10 °C/min. The resin is polymerized by a high-pressure route and is supplied without a defined slip package; final additive loading is determined by the converter. The values below should be verified against the lot-specific certificate of analysis because batch-to-batch variation may occur.
| Property | Test method | Typical value |
|---|---|---|
| Vinyl acetate content | ASTM D5594 | 18% by mass |
| Melt flow rate | ASTM D1238 (190 °C, 2.16 kg) | 3.4 g/10 min |
| Density | ISO 1183-1 | 0.940 g/cm³ |
| DSC melting peak | ASTM D3418 | 84 °C |
| Hardness | ASTM D2240 type D | 38 Shore D |
| Tensile stress at break | ASTM D638 type IV | 17 MPa |
| Elongation at break | ASTM D638 type IV | 750% |
On a 45 mm, 30:1 L/D single-screw extruder with a barrier mixing section, EVA 1834 is processed using a feed zone temperature of 120 °C, a compression zone of 145–160 °C, and a metering or die zone not exceeding 190 °C. Melt pressure at the screen pack should remain below 20 MPa; higher pressure indicates insufficient heat input, solid-bed breakup, or excessive screen blockage. Screw speed in the range of 60–90 rpm on this extruder class typically produces 30–45 kg/h depending on die restriction. The resin is not hygroscopic in the same manner as polyamide, but cold pellet surfaces condense moisture during storage in unheated warehouses. Pellets stored below 15 °C should be brought to room temperature before hopper opening; otherwise, surface water can produce strand splay and film surface defects.
In chemically blown footwear sheet production, the melt must be held below the decomposition onset temperature of the blowing agent until the die lip. For azodicarbonamide-based masterbatch formulations at 0.5–1.5 phr active agent, gas evolution becomes measurable at 155–165 °C under atmospheric pressure. Barrel zones after the feed throat are therefore set at 90–110 °C, with the die held at 95–115 °C. This is below the normal solid-resin melt processing window for EVA 1834, but the limited crystalline fraction from 18% vinyl acetate permits melting under die-wall heat and screw shear. A hot spot in the breaker plate region can initiate gas evolution inside the barrel, producing surging and sheet thickness variation. Thermocouple checks across the die circumference should show a temperature spread no greater than ±3 °C, and an upstream melt-pressure transducer is used to detect the pressure decrease that precedes premature gas formation. On a 90 mm, 36:1 L/D tandem foam extrusion line, melt pressure before the die is maintained in the range of 8–14 MPa to keep gas in solution until the die exit.
For injection molded articles, melt temperature is set at 180–210 °C, and the mold surface is held at 30–50 °C. Clamp force calculation follows standard polyolefin practice: projected area multiplied by 30–45 MPa cavity pressure for technical parts, with lower cavity pressures of 15–25 MPa for thick-walled flexible components. A reverse temperature profile of 180 °C at the feed zone, 190 °C in the compression zone, and 200 °C at the nozzle minimizes screw slip and melt residence time. Injection speed in the range of 50–100 mm/s is used for thin-wall parts to prevent premature freeze-off; thick sections use 20–40 mm/s and higher holding pressure to reduce sink marks and internal voids.
The processing difficulty in crosslinked EVA foam is not gas yield alone but synchronization of peroxide decomposition, blowing agent decomposition, and loss of polymer crystallinity. The DSC melting peak near 84 °C does not indicate that EVA 1834 is fully amorphous at the blowing agent decomposition temperature. A broad crystalline melting distribution extends toward 100 °C in slow heating, and residual crystallites restrict cell expansion. Industrial practice therefore raises mixing temperature to 100–110 °C before the melt enters the crosslinking section. If the blowing agent decomposes before the crystalline network has softened, foam exhibits coarse cell structure and high open-cell fraction. If the peroxide crosslinks the melt before gas evolution, expanding gas tears the network and produces internal splits. A process window can be established by dynamic rheometry with a curemeter oscillating at 1 Hz and 0.5° strain; the crossover of storage modulus and loss modulus should occur after the onset of gas evolution but before completion of blowing agent decomposition. Published data for this specific grade is limited; however, plant-scale compounding lines frequently use 900–1,100 s residence time from the point of peroxide injection to the die exit.
In footwear midsoles, EVA 1834 is used as a base resin in expanded sheet formulations with 2–4 phr azodicarbonamide and 0.5–1.2 phr dicumyl peroxide. The expanded sheet is pressed at 160–170 °C for 8–12 min and cooled in a vented hydraulic press to prevent shrinkage. Foam density is controlled in the range of 0.18–0.25 g/cm³. Shore C hardness after expansion depends more on crosslink density and blowing agent type than on the base resin melt flow rate; nevertheless, the 3.4 g/10 min melt flow rate provides sufficient green strength for roll handling before press curing.
EVA 1834 should not be exposed to melt temperatures above 230 °C for extended periods. Vinyl acetate units undergo acetic acid elimination at elevated temperature, producing a pH shift and colored degradation products. The resin is incompatible with strongly alkaline additives that catalyze saponification; zinc stearate, calcium stearate, and unbuffered primary antioxidants are used at levels below 0.3 phr if acid scavenging is required. In the presence of residual moisture and heat, trace acetic acid generation can occur; molds and downstream mandrels should therefore be fabricated from corrosion-resistant steel or hard-chromed surfaces. The material is soluble in aromatic and chlorinated hydrocarbons and should not be used in direct contact with ketones, esters, or low-molecular-weight aldehydes. These solvents swell the amorphous vinyl acetate segments and reduce mechanical load-bearing capacity in the article.
At 18% vinyl acetate, EVA 1834 retains enough polyethylene crystallinity to be handled as a free-flowing pellet and processed on standard polyolefin equipment. Compared with a 13% vinyl acetate copolymer, the additional comonomer lowers flexural modulus by approximately 25–35% when measured under ISO 178 at 23 °C. The grade shows higher elongation at break and improved low-temperature impact resistance, but lower heat deflection temperature. Increased polarity from the vinyl acetate monomer improves dispersion of calcium carbonate and magnesium hydroxide flame retardants, allowing higher filler loadings before melt fracture appears. Compared with a 28% vinyl acetate copolymer, EVA 1834 has a higher melting peak, lower blocking tendency, and lower adhesion to polar substrates such as polyurethane and aluminum. It is selected where a hot-melt-grade polymer would be too soft and a low-VA grade would be too stiff. For printable film, corona treatment of EVA 1834 to 38–42 mN/m surface energy is necessary; the natural surface energy is approximately 32–35 mN/m when measured by contact-angle methods.
In blown film, EVA 1834 can be used as a seal layer or as a blend partner with metallocene polyethylene. The higher vinyl acetate content lowers seal initiation temperature by approximately 10–15 °C compared with a low-density polyethylene homopolymer. In a 5 wt% blend with LDPE, seal initiation temperature falls to 90–100 °C when measured by hot-tack testing under ASTM F1921. The addition also improves bubble stability at low frost line heights because the mostly linear EVA chains dilute the long-chain branching of LDPE. Compliance for food-contact applications must be confirmed against the grade-specific certificate and final article testing under EU Regulation 10/2011 or FDA 21 CFR 177.1350, where applicable.
