| HS Code | 390573 |
| Product | CERTENE EDI-240 |
| Base Polymer | Ethylene Vinyl Acetate Copolymer |
| Manufacturer | Muehlstein |
| Vinyl Acetate Content | 24% |
| Melt Flow Rate | 240 g/10 min at 190°C / 2.16 kg |
| Density | 0.940 g/cm³ |
| Tensile Strength | 6.0 MPa |
| Elongation At Break | 700% |
| Melting Point | 85°C |
| Vicat Softening Temperature | 50°C |
| Glass Transition Temperature | -35°C |
| Viscosity | 1000 mPa·s at 140°C |
As an accredited CERTENE EDI-240 Ethylene Vinyl Acetate Copolymer (Muehlstein) factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied as pellets in 25 kg multiwall paper bags, palletized and wrapped, with product label and lot traceability. |
| Container Loading (20′ FCL) | 20′ FCL container loading of CERTENE EDI-240 EVA copolymer: secure palletized bags, prevent moisture/contamination, ensure safe, stable transport. |
| Shipping | CERTENE EDI-240 is an ethylene vinyl acetate copolymer supplied as solid pellets. It ships in multiwall paper bags or bulk packaging, stored in a dry, ventilated area. Non-hazardous under normal conditions, but avoid dust accumulation and heat sources. Standard freight handling, no special temperature control required. |
| Storage | Store CERTENE EDI-240 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. Avoid stacking too high or exposing to extreme temperatures. Follow the manufacturer’s Safety Data Sheet for specific requirements. Ideal storage conditions maintain product quality and safe handling. |
| Shelf Life | Store in original container in a cool, dry area. Shelf life is two years from date of manufacture when properly stored. |
CERTENE EDI-240 (Muehlstein) is an ethylene-vinyl acetate copolymer with a nominal vinyl acetate content of 24 wt% and a melt flow rate of 2.0 g/10 min at 190°C/2.16 kg per ASTM D1238. The polymer is supplied in pellet form for compounding and direct extrusion. In closed-cell footwear foam production, EDI-240 is pre-blended with azodicarbonamide, dicumyl peroxide, zinc oxide, and zinc stearate before twin-screw compounding. A typical midsole formulation combines 100 phr EDI-240, 3.0–4.0 phr azodicarbonamide, 0.8–1.2 phr dicumyl peroxide with active oxygen content of 3.5–4.0%, 1.5–2.5 phr zinc oxide, and 0.5–1.0 phr zinc stearate. The compounding line uses an intermeshing co-rotating twin-screw extruder with L/D between 40:1 and 48:1. Barrel temperatures are set from 95°C in the feed zone to 105°C at the die, keeping melt temperature below 110°C to prevent premature azodicarbonamide decomposition. Azodicarbonamide gas evolution onset is approximately 160°C; zinc oxide shifts the effective decomposition range and increases gas yield per unit mass. The compounded pellets are injection molded on multi-cavity midsole machines with clamp force between 150 t and 250 t. Injection barrel temperatures are maintained at 90–105°C and mold temperatures at 160–170°C. The vinyl acetate content reduces melt viscosity and allows lower injection pressure than LDPE, but cavity packing must be controlled to avoid pre-foaming before peroxide crosslinking. The primary processing window is narrow: a mold temperature deviation of ±5°C produces either surface sink marks or internal void coalescence. When blowing agent decomposition and crosslinking are balanced, foam density falls between 0.16 g/cm³ and 0.22 g/cm³. Asker C hardness ranges from 45 to 60 depending on density and cooling rate. End products include running shoe midsoles, sandal soles, and orthopedic insole bases. Export compliance for finished footwear requires REACH SVHC screening, California Proposition 65 testing for blowing agent residues, and AfPS GS 2019:01 PAK certification when marketed in the EU.
| ADC loading (phr) | Foam density (g/cm³) | Asker C hardness | Cell structure observation |
|---|---|---|---|
| 2.0 | 0.29 | 62 | Coarse cells; surface sink marks |
| 3.5 | 0.19 | 52 | Fine uniform cells |
| 5.0 | 0.12 | 38 | Internal voids; surface collapse |
Photovoltaic encapsulant film based on EDI-240 is cast through a flat die onto release liner at thicknesses from 0.45 mm to 0.60 mm. The formulation contains 100 phr EVA, 1.2–1.5 phr tert-butyl peroxy-2-ethylhexyl carbonate as curing agent, 0.3–0.5 phr vinyltrimethoxysilane coupling agent, 0.1–0.3 phr benzotriazole UV absorber, and 0.05–0.15 phr hindered amine light stabilizer. Lamination is performed in a vacuum membrane laminator at 145–155°C for 12–18 min. Gel content after lamination is measured by xylene extraction according to ASTM D2765; a value of 75–90% is required for creep resistance at module operating temperature. The 24 wt% vinyl acetate content yields a refractive index near 1.48 after crosslinking, which reduces interfacial reflection loss at the glass interface. Adhesion to glass is evaluated after damp heat exposure at 85°C/85% RH; compressive shear values above 40 N/cm are considered acceptable under IEC 61215-1:2021. The main process conflict is peroxide half-life control. At lamination temperatures above 150°C, rapid peroxide decomposition forms gas bubbles before module cavity evacuation is complete. If peroxide loading drops below 1.0 phr, gel content falls below 70% and delamination occurs after thermal cycling from -40°C to +85°C. Film moisture must be kept below 0.05 wt% to prevent silane pre-hydrolysis and storage-related pre-crosslinking. End products are single-glass and glass-glass module encapsulant sheets. Compliance requires IEC 61215-1:2021, UL 1703 for North American modules, and RoHS 2011/65/EU Annex II screening for lead and cadmium.
Hot melt adhesive compounding with EDI-240 is performed in sigma-blade mixers or extruders at temperatures between 120°C and 160°C. A packaging-grade pressure-sensitive formulation uses 30–40 wt% EDI-240, 40–50 wt% hydrogenated hydrocarbon tackifier, 10–20 wt% microcrystalline wax, and 0.5–1.0 wt% antioxidant. The polymer is pre-melted before tackifier addition to limit thermal history and prevent localized oxidation. Finished adhesive viscosity is measured by ASTM D3236 at 180°C. Published Brookfield viscosity data for neat EDI-240 at 180°C is limited; compounders establish lot-specific curves because tackifier chemistry and wax type dominate the final melt curve. Open time in packaging applications is controlled by wax fraction and application temperature, typically 3–8 s at 150°C. Thermal stability is evaluated by viscosity drift after 96 h at 175°C under nitrogen; drift below 10% is the standard acceptance criterion in supplier processing guidelines. Pre-drying is required at 70°C for 2 h when storage relative humidity exceeds 60%. EDI-240 should not be compounded with amine-based tackifiers or residual amine catalysts because amine species accelerate vinyl acetate deacetylation, releasing acetic acid and causing viscosity drift and equipment corrosion. End products include carton sealing hot melt, bookbinding adhesive, and flexible packaging lamination adhesive. Regulatory status falls under FDA 21 CFR 175.105 for adhesive components; REACH and RoHS documentation is required for EU export.
EDI-240 is used as a high-filler-acceptance base polymer for flame-retardant low-voltage cable jacketing compounds. The 24 wt% vinyl acetate content permits substantial aluminum trihydrate loading without complete loss of elongation. A typical flame-retardant compound contains 100 phr EDI-240, 120–180 phr aluminum trihydrate, 5–10 phr magnesium hydroxide, 1–3 phr vinyl silane coupling agent, and 0.5–1.5 phr heat stabilizer. Compounding is performed on a co-rotating twin-screw extruder with L/D 40:1 and drive power of 75 kW. When total filler content exceeds 60 wt%, screw torque approaches 85–95% of drive capacity and melt temperature control becomes the limiting production factor. Barrel temperatures use a reverse profile from 160°C at the feed throat down to 135°C at the die to prevent water release from aluminum trihydrate, which begins near 180–200°C. The resulting compound is extruded onto copper conductor at line speeds of 200–400 m/min for thin-wall automotive primary wire. Oxygen index measured by ASTM D2863 exceeds 28% when total filler content is above 55 wt%. Tensile strength before aging is 10–12 MPa and elongation at break is 150–250% according to IEC 60811-501. The operational boundary occurs at aluminum trihydrate loadings above 180 phr; surface roughness increases and die pressure becomes unstable due to poor filler dispersion. Pre-drying at 80°C for 3 h is mandatory when ambient relative humidity exceeds 60%. End products include low-voltage appliance wiring, automotive primary wire insulation, and building wire jacketing. Compliance requires IEC 60502-1 for power cables, UL 44 for thermoset-insulated wires when crosslinked, and EN 50575 CPR documentation for construction products in the EU.
| ATH loading (phr) | Total filler (wt%) | Oxygen index (%) | Tensile strength (MPa) | Elongation at break (%) |
|---|---|---|---|---|
| 120 | 55 | 27 | 12 | 250 |
| 150 | 61 | 30 | 11 | 200 |
| 180 | 65 | 33 | 10 | 160 |
EDI-240 is also used as a carrier polymer for color and additive masterbatches in polyolefin film and molding applications. The recommended letdown ratio is 2–4% in LDPE or LLDPE, and the carrier is wetting-agent-free; compliance follows REACH and EN 71 for toy applications when specified by the masterbatch producer.
Closed-cell EVA foam for automotive underhood acoustic insulation is produced by calendering or extruding EDI-240 sheet, foaming with 2.0–3.0 phr azodicarbonamide, and then crosslinking by electron beam at absorbed doses from 25 kGy to 60 kGy. Beam energy is typically 800 keV for sheet thickness below 2.0 mm. Gel fraction measured by ASTM D2765 after irradiation is 50–75%. Electron-beam processing separates foaming from crosslinking, eliminating the peroxide scorch constraint found in compression-molded EVA foam. The vinyl acetate segments are sensitive to chain scission above 100 kGy, causing tensile strength loss and yellowing. The foamed sheet is laminated with a 0.05 mm polyester nonwoven backing and must pass FMVSS 302 horizontal burn rate below 100 mm/min with the backing intact. Compression set at 23°C after 24 h is typically 25–35% according to ASTM D3574. End products include dashboard insulator pads, hood liners, and floor damping sheets. Automotive interior material submission requires IATF 16949 documentation, REACH SVHC screening, and VDA 278 VOC/FOG emission testing.
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Supplied through Muehlstein, CERTENE EDI-240 is an ethylene-vinyl acetate copolymer pellet grade. The EDI-240 nomenclature is consistent with a nominal vinyl acetate comonomer content of 24 wt% and a nominal melt flow index of 2.0 g/10 min when measured at 190 °C under a 2.16 kg load in accordance with ASTM D1238-20 or ISO 1133-1:2022. The copolymer is produced by high-pressure radical copolymerization, which gives a random comonomer distribution and lowers crystallinity relative to low-density polyethylene homopolymer. Lot-specific values for vinyl acetate content, melt flow index, density, additive package, and moisture are recorded on the certificate of analysis supplied by Muehlstein and control the actual processing window.
Because the vinyl acetate side groups interrupt the polyethylene crystal lattice, density is typically reported near 0.94 g/cm³ under ASTM D1505. The material is intended for extrusion, coextrusion, injection molding, and high-shear compounding. Typical fabrication routes include sealant webs in flexible packaging, chemically blown or crosslinked foam, footwear midsoles, and filled wire-and-cable compounds. The resin is not a single-site ethylene-octene plastomer; its acetate functionality provides higher polarity, lower heat-seal initiation temperature, and a different thermal-degradation envelope.
Processors should not infer a universal processing window from the melt index alone. Incoming inspection under ASTM D1238-20 is required where film gauge, foam density, or injection-part weight are critical. Lot-to-lot melt-flow variation in the range of ±0.2 g/10 min can be acceptable for general extrusion but may require throughput or temperature adjustment on lines operating at narrow tolerance.
The reduction in crystallinity produces a broad melting endotherm under ASTM D3418-21. Representative values for ethylene-vinyl acetate copolymers containing 24 wt% vinyl acetate center near 76 °C, while the Vicat softening temperature under ASTM D1525 with a 10 N load is commonly reported near 54 °C. These values restrict continuous load-bearing service. A film, foam part, or molded component held above 50 °C can exhibit blocking, creep, and loss of dimensional recovery. The thermal ceiling is lower than that of 12–18 wt% vinyl acetate grades, which generally retain useful stiffness at higher service temperatures.
At the same time, the polar acetate group improves surface wetting on polar substrates. In coextruded blown film, adhesion to polyamide, ethylene-vinyl alcohol, ionomer, and coated paper is improved compared with a low-density polyethylene sealant when tested on laboratory coextrusion lines using a die gap of 2.0 mm and a blow-up ratio of 2.0:1–2.5:1. Adhesion is not a single bulk property; it depends on interfacial melt temperature, line speed, air-gap residence time, and the polarity of the adjacent layer.
Thermal degradation is the principal process limitation. Above approximately 210 °C, the acetate group undergoes acetic acid elimination. The field indicators are acetic odor, yellowing, gel formation, die-lip carbonization, and reduced film clarity. Long residence time at elevated temperature or high-shear zones with poor temperature control can initiate degradation even when the barrel set point is below 210 °C. Unvented equipment, oversized screw channels, or high screw speed can push actual melt temperature outside the safe range.
The lower melting point is advantageous in sealant layers. Heat-seal initiation for EVA copolymers in this composition range commonly falls between 85 °C and 100 °C on heated-bar equipment with jaw pressure of 0.3–0.5 MPa and dwell time of 0.5–1.0 s. This permits coextruded structures to seal below the deformation temperature of oriented outer layers. The actual seal window must be established on the target packaging line because film thickness, heat-transfer rate, and contaminant levels shift the curve.
Within ethylene-vinyl acetate copolymers, the 24 wt% vinyl acetate grade occupies an intermediate position. Lower-vinyl-acetate grades with 12–18 wt% comonomer show higher crystallinity, higher melt point, higher tensile strength, and lower surface tack. Higher-vinyl-acetate grades with 28–33 wt% comonomer show lower melt point, higher elongation, greater polarity, and more rubber-like behavior, but they are more difficult to pelletize, more prone to blocking, and less thermally stable. The values in the following tables are representative of unfilled ethylene-vinyl acetate copolymers and are not a substitute for the lot certificate of analysis for EDI-240.
| Property | Test method | Representative value for EDI-240 |
|---|---|---|
| Vinyl acetate content | ASTM D5594-18 | 24 wt% nominal |
| Melt flow index | ASTM D1238-20, 190 °C, 2.16 kg | 2.0 g/10 min |
| Density | ASTM D1505 | 0.94 g/cm³ |
| DSC melting peak | ASTM D3418-21 | 76 °C |
| Vicat softening point | ASTM D1525, 10 N | 54 °C |
| Hardness | ASTM D2240 | Shore A 85 / Shore D 32 |
| Tensile strength at break | ASTM D638 | 11 MPa |
| Elongation at break | ASTM D638 | 750% |
The table below summarizes the general property shift relative to low- and high-vinyl-acetate EVA copolymers. These ranges are drawn from published polymer-science data for unfilled resins and are affected by molecular weight, additive package, and test specimen preparation.
| Property | 12–18 wt% vinyl acetate EVA | EDI-240, 24 wt% vinyl acetate | 28–33 wt% vinyl acetate EVA |
|---|---|---|---|
| DSC melting peak | 90–100 °C | 72–78 °C | 55–70 °C |
| Shore A hardness | 95–97 | 80–85 | 60–75 |
| Tensile strength at break | 15–20 MPa | 10–14 MPa | 5–8 MPa |
| Elongation at break | 600–700% | 700–800% | 800–1000% |
| Heat-seal initiation range | 105–120 °C | 85–100 °C | 70–85 °C |
Film structures specifying EDI-240 as a sealant benefit from reduced seal initiation, but the lower melt temperature must be considered when the same line runs polyamide or polyester outer layers. Blow-up ratio, frost-line height, and collapsing-frame tension require re-setting when changing from a low-vinyl-acetate sealant or LDPE sealant to this grade. Failure to adjust these parameters can produce bubble instability, gauge variation, blocking at the nip, and width variation in finished reels.
In foam processing, the grade accepts chemical blowing agents such as azodicarbonamide at 2.0–4.0 phr. Compression molding or continuous vulcanization lines must control mold temperature within ±2 °C because the decomposition of azodicarbonamide and the melt viscosity of the EVA matrix are both temperature-sensitive. Free-foam density is typically in the range of 0.08–0.20 g/cm³, depending on mold fill ratio, gas loss, and blowing-agent efficiency. Crosslinked molded foams commonly use dicumyl peroxide at 0.5–1.0 phr; cure behavior is monitored on a moving-die rheometer at 175 °C to avoid scorch during injection or transfer molding.
In wire-and-cable compounding, mineral filler loadings of 60–70 wt% are processed on co-rotating twin-screw extruders with L/D 40:1, side feeding, and controlled barrel venting. Melt temperature must be kept below 210 °C at the die. When magnesium hydroxide or aluminum trihydrate is used, vent vacuum should be maintained at −0.08 MPa gauge or better to remove moisture and volatile by-products. Torque above approximately 85% of drive capacity indicates overfeeding or insufficient screw-dispersive capacity and may lead to melt-temperature rise and resin degradation.
On a single-screw blown-film extruder with L/D ≥ 24:1 and a barrier screw, a rising barrel profile from 120 °C at the feed zone to 190 °C at the adapter is used. Die temperatures are maintained between 190 °C and 205 °C. If melt temperature exceeds 210 °C, acetic acid evolution and die-lip carbonization become likely. Screw speed, backpressure, and screen-pack resistance should be configured so that measured melt temperature remains below 210 °C. Purging with a low-melt-index LDPE before shutdown reduces oxidized EVA deposits in the die and adapter.
Moisture uptake above 0.05 wt% can generate surface defects, bubbles, and loss of film clarity. At ambient relative humidity above 55% RH, pre-drying is recommended at 60–65 °C for 3–4 h in a desiccant dryer. Drying temperatures above 70 °C should be avoided because pellet agglomeration can occur in the hopper or dryer bed. Injection molding uses barrel temperatures of 140 °C to 190 °C and mold temperatures of 20–35 °C. Gate blush, sink marks, and weld-line weakness are common when mold temperature is below 15 °C or when injection speed is excessive for wall thickness.
Compared with an ethylene-methyl acrylate copolymer of similar comonomer content, EVA offers higher polarity at equivalent melt index but has a lower thermal-degradation threshold because the acetate group can eliminate acetic acid. Compared with a single-site ethylene-octene polyolefin elastomer, EDI-240 provides better adhesion to polar substrates but lower thermal stability and lower ultraviolet resistance. These differences affect material selection in coextruded sealant, tie-layer, and adhesive applications.
Regulatory support for this EVA grade is typically limited to food-contact statements under FDA 21 CFR 177.1350 when the resin is used in repeat-use food-contact articles under specified conditions, but the converter must verify end-use migration limits. For European articles, compliance is assessed under EU Regulation 10/2011 using food simulants. The supplier can provide a Declaration of Compliance only when the specific lot, final thickness, temperature, and food type fall within the intended-use scope. Industrial requirements such as REACH and RoHS Directive 2011/65/EU are generally addressed in the supplier’s regulatory documentation, not by the grade designation alone.
Pellets should be stored in unopened bags at temperatures below 35 °C and away from direct sunlight. EVA copolymers are susceptible to oxidative degradation over extended storage. Condensation from temperature swings can raise pellet moisture and require drying. The material should not be exposed to copper, copper alloys, or strong oxidizing agents because metal ions can accelerate thermo-oxidative breakdown. In silos, surface tack and low melt point can cause pellet bridging at wall temperatures above 40 °C; mass-flow bins and first-in, first-out inventory management are preferable.
Avoid compounding with amine-based antistatic or stabilizer additives that can react with residual acetic acid and cause premature crosslinking, discoloration, or plate-out on die surfaces. Recycling of post-industrial scrap is possible when the scrap is screened for melt flow index and vinyl acetate content by ASTM D5594-18 or equivalent FT-IR methods. Batch-to-batch variation in scrap can shift the melt index beyond the processing tolerance of the line. When regrind is used above 20 wt%, gel count, color shift, and melt pressure should be monitored at regular intervals.
