| HS Code | 334532 |
| Product Name | ELVAX CM576 Ethylene Vinyl Acetate Copolymer |
| Chemical Family | Ethylene Vinyl Acetate (EVA) Copolymer |
| Vinyl Acetate Content | 40 wt% |
| Melt Flow Rate 190 C 2 16 Kg | 270 g/10 min |
| Density | 0.965 g/cm³ |
| Melting Point Dsc | 63 °C |
| Crystallization Point Dsc | 46 °C |
| Vicat Softening Point | 52 °C |
| Tensile Strength At Break | 3.4 MPa |
| Elongation At Break | 250% |
| Flexural Modulus | 11 MPa |
| Shore A Hardness | 62 |
| Brittleness Temperature | -80 °C |
As an accredited ELVAX CM576 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX CM576 Ethylene Vinyl Acetate Copolymer is supplied as free-flowing pellets in 25 kg multi-ply paper bags. |
| Container Loading (20′ FCL) | 20′ FCL shipment of ELVAX CM576 copolymer pellets, packed in palletized bags, dry container, protected from moisture and contamination. |
| Shipping | ELVAX CM576 is shipped as solid pellets in multi-layer paper bags or drums, kept dry and away from heat, ignition sources, and oxidizers. Standard non-hazardous cargo classification applies under normal conditions. Store in a cool, ventilated area; avoid dust accumulation and mechanical impact that could damage packaging. |
| Storage | Store ELVAX CM576 Ethylene Vinyl Acetate Copolymer in its original, tightly closed container in a cool, dry, well-ventilated area. Protect from direct sunlight, heat, and ignition sources. Keep away from strong oxidizing agents. Avoid excessive humidity to prevent moisture pickup. Maintain moderate temperatures and good housekeeping to prevent dust accumulation and static charge buildup. |
| Shelf Life | Shelf life is typically 2 years from date of manufacture when stored in original, unopened containers in a cool, dry place. |
At the lamination stage of crystalline-silicon module assembly, ELVAX CM576 with a nominal vinyl acetate content of 28% and a melt index of 6 g/10 min (ASTM D1238, 190°C/2.16 kg) is compounded into a peroxide-curable encapsulant sheet in which pre-cure melt flow must remain low enough to fill the glass–cell interface without entrapped gas, yet crosslink to a gel fraction that prevents creep under module operating temperatures. The formulation is metered by weight: 100.0 phr ELVAX CM576, 0.8–1.5 phr tert-butylperoxy-2-ethylhexyl carbonate as crosslinking initiator, 0.3–0.5 phr 3-methacryloxypropyltrimethoxysilane as glass-adhesion promoter, 0.1–0.3 phr hindered phenolic antioxidant, and 0.1–0.3 phr UV stabilizer. Compounding is carried out in a co-rotating twin-screw extruder with barrel temperatures below 100°C, followed by cast-film extrusion through a slot die at melt temperatures of 70–95°C; the chill roll is held at 10–20°C to prevent blocking and to freeze the amorphous EVA morphology. The sheet is laminated in a vacuum membrane laminator at 145–155°C for 10–15 min, yielding a gel content measured by ASTM D2765-16 of 70–90%. Using a peroxide level above 1.5 phr raises the gel fraction above this window and produces embrittlement at the cell perimeter, while levels below 0.8 phr leave residual uncrosslinked polymer that migrates under damp heat. The finished product is the transparent encapsulant interlayer in single-glass and glass-glass crystalline-silicon modules.
| Standard | Scope | Relevant test condition |
|---|---|---|
| IEC 61215-1:2021 | Design qualification and type approval of terrestrial photovoltaic modules | Damp heat 85°C/85% RH, 1000 h; thermal cycling −40°C to +85°C |
| IEC 61730-1:2016 | Photovoltaic module safety qualification | Electrical insulation and flammability class assessment |
| ISO 1133-1:2022 | Determination of melt mass-flow rate of thermoplastics | 190°C, 2.16 kg |
| ASTM D2765-16 | Determination of gel content in crosslinked ethylene plastics | Solvent extraction in boiling xylene |
| ASTM D638-14 | Tensile properties of plastics | Type IV specimen, 50 mm/min |
Production-scale hot-melt adhesive batches using ELVAX CM576 exhibit open time governed by the interplay of tackifier solvation and wax crystallisation on the substrate surface. The addition range is controlled as follows: 25–35 wt% ELVAX CM576, 35–45 wt% rosin ester or hydrogenated hydrocarbon tackifier, 20–30 wt% microcrystalline wax with a melting point of 65–75°C, and 0.5–1.0 wt% antioxidant. Processing is carried out in a jacketed sigma-blade mixer at 150–170°C under a nitrogen blanket for 45–60 min, with the ELVAX CM576 charged first to establish melt viscosity before tackifier addition. In high-speed case-sealing lines, the adhesive is applied through slot-die or spiral-spray nozzles at 160–175°C; open time at 25°C is typically 1.5–4 s, measured by the interval between adhesive deposition and substrate fibre tear loss. Viscosity is monitored by ASTM D3236 at 175°C and should remain between 800 mPa·s and 2500 mPa·s. Batches held at 175°C under nitrogen for 24 h should show viscosity drift below 15%; a larger drift indicates gel formation from acetic acid release and must be rejected. The operating boundary is 180°C because ELVAX CM576 begins to deacetylate at higher temperatures, producing corrosive acetic acid vapour and carbonaceous residue. Compliance for food-contact packaging adhesives falls under FDA 21 CFR 175.105, with the EVA base resin subject to FDA 21 CFR 177.1350 and EU No 10/2011; REACH registration is required for EU import. The terminal finished product is corrugated case and carton sealing, tray erection, and frozen-food outer packaging.
When a cable jacket compound must pass the single-flame test without generating halogen acid gas, ELVAX CM576 is used as the polar polymer matrix for metal hydrate fillers because its vinyl acetate units promote filler wetting and char formation. A typical formulation uses 100.0 phr ELVAX CM576, 120–160 phr precipitated aluminium trihydrate, 20–40 phr magnesium hydroxide, 5–10 phr zinc borate, 1.0–2.0 phr organic peroxide, 0.5–1.0 phr hindered phenolic antioxidant, and 1–3 phr vinyl silane processing aid. Dispersion is performed in a Banbury mixer or co-rotating twin-screw extruder with an L/D ratio of 40:1–52:1 and a screw compression ratio of 1.6:1–2.0:1; the ELVAX CM576 is melted at 120–140°C, and the metal hydrates are side-fed after the melt seal to prevent barrel wear. The melt temperature must remain below 135°C because the peroxide begins to decompose at 140°C, producing pre-crosslinked gels that cause surface roughness and die drool on the cable line. Cable jacket extrusion takes place at 110–135°C, followed by crosslinking either by electron beam at 8–15 Mrad or by continuous vulcanisation at 180–200°C under pressure. The processing window is ±5°C to ±7°C; operating above this range causes scorch, while operating below it reduces filler dispersion and flame retardancy. Compliance is assessed under IEC 60502-1:2021 for power cable design, IEC 60332-1-2:2015 for vertical flame propagation, IEC 60754-1:2011 and IEC 60754-2:2011 for halogen acid gas release, and RoHS Directive 2011/65/EU. The terminal product is low-smoke zero-halogen sheathing for power cables in tunnels, railway installations, data centres, and public buildings.
For aseptic beverage cartons with PE/foil/paperboard structures, ELVAX CM576 serves as the tie layer between aluminium foil and low-density polyethylene, compensating for differential thermal expansion and promoting wet-out of the aluminium oxide surface during melt curtain deposition. The tie-layer composition is typically 80–100 wt% ELVAX CM576, with the balance as LDPE or LLDPE to modify neck-in and melt tension; a coat weight of 12–18 g/m² is applied. Processing is performed on a single-screw extruder with an L/D ratio of 30:1 and a coat-hanger slot die at 230–260°C. The air gap is maintained at 100–200 mm, nip roll pressure is set at 40–80 N/cm, and the chill roll is held at 15–25°C. Under these conditions, the EVA tie layer fuses to the foil without volatilising acetic acid, and the rapid quench limits crystallinity to preserve adhesion. Converters commonly measure T-peel adhesion by ASTM D1876, but published data for ELVAX CM576 in this exact tie-layer configuration is limited; qualified suppliers typically require converter-specific minimum values rather than resin-level guarantees. Food-contact compliance rests on FDA 21 CFR 177.1350, EU No 10/2011, and EC 1935/2004. The terminal products are aseptic liquid packaging, retort pouches, and foil-laminated sachets for liquid and semi-liquid food products.
Roofing membrane plants that modify bitumen with ELVAX CM576 observe a sharp viscosity inflection when the polymer addition level crosses 6 wt%; below this threshold the EVA acts mainly as a viscosity modifier, while above it a continuous polymer-rich phase forms after cooling and imparts low-temperature flexibility and fatigue resistance. The compounding window is set at 4–8 wt% ELVAX CM576 in bitumen, with an optimum processing range of 6–7 wt%. After polymer dissolution, limestone filler is added at 20–40 wt% to control tack and dimensional stability. Mixing is performed in a high-shear rotor-stator mixer at 180–190°C for 30–60 min; the polymer is considered dispersed when the torque curve stabilises and the mixture passes a 150 µm screen without visible gels. Viscosity is measured by Brookfield at 180°C, softening point by ASTM D36, and needle penetration by ASTM D5. A formulation exceeding 8 wt% EVA raises viscosity enough to impede pumping and sheet extrusion, while a cooling rate below 1°C/min can induce phase separation visible as dull patches on the finished membrane. Compliance is assessed under EN 13707:2004+A2:2009 for flexible sheets for waterproofing, ASTM D5147-18 for sampling and testing modified bituminous sheet, and REACH for EU market entry. The terminal finished product is torch-applied polymer-modified bitumen waterproofing membrane for flat roofs, podium decks, and bridge-deck waterproofing.
The decomposition kinetics of azodicarbonamide in an ELVAX CM576 foam formulation control the balance between cell nucleation and cure rate. The compound is formulated with 100.0 phr ELVAX CM576, 2.5–4.0 phr azodicarbonamide blowing agent, 0.8–1.2 phr dicumyl peroxide, 1.0–2.0 phr zinc oxide, 0.5–1.0 phr stearic acid, and 5–15 phr talc or calcium carbonate as a nucleating filler. Mixing is performed in an internal mixer at 90–105°C to prevent both blowing-agent decomposition and peroxide pre-cure, followed by pelletising. Injection molding is carried out with a barrel profile of 90–120°C and a mold held at 170–180°C for 8–12 min; the mold opening step releases the gas-laden melt into a controlled expansion that produces the closed-cell foam structure. If the barrel temperature exceeds 120°C, pre-foaming occurs in the screw channel and the molded part shows surface swirl and density variation. Zinc oxide lowers the azodicarbonamide decomposition temperature from approximately 200°C to 155°C, aligning gas evolution with peroxide cure. Compliance is evaluated under REACH Annex XVII entry 76 for dimethylformamide restrictions, REACH SVHC screening, and ASTM D3574 for flexible cellular materials. The terminal finished product is an injection-molded EVA foam midsole for athletic and casual footwear.
Competitive ELVAX CM576 Ethylene Vinyl Acetate Copolymer prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615380400285 or mail to sales2@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615380400285
Email: sales2@liwei-chem.com
Flexible payment, competitive price, premium service - Inquire now!
ELVAX CM576 is a pelletized ethylene vinyl acetate copolymer resin supplied for hot-melt adhesive, sealant, wax-coating, and polymer compounding operations where the base polymer is specified by a vinyl acetate comonomer content of 28 wt% and a melt mass-flow rate of 6 g/10 min determined at 190 °C/2.16 kg according to ISO 1133-1:2022 or ASTM D1238-23. The grade occupies the mid-high vinyl acetate segment of the ethylene copolymer range and is differentiated from grades with 9–18 wt% vinyl acetate by lower crystallinity, higher polarity, and broader compatibility with rosin ester and hydrocarbon tackifiers. Because the comonomer content suppresses the ethylene melting peak, the resin is most often selected for applications requiring adhesion to polar surfaces or flexibility at low temperatures. It is not supplied as a ready-to-use adhesive; downstream viscosity, open time, and peel strength must be determined on the formulated compound.
Thermal stability in CM576 during compounding is restricted by deacetylation of the vinyl acetate units. At melt temperatures above 170 °C, the rate of acetic acid evolution increases, and prolonged residence time leads to molecular weight loss and color development. On corotating twin-screw extruders with 40:1 L/D barrels and segmented screw elements, typical barrel settings are 120–160 °C, with melt temperature held below 180 °C. Pre-drying in a desiccant dryer at 60 °C for 4 h is required when pellet moisture exceeds 0.1 wt% or ambient relative humidity is above 60% RH; water hydrolyzes acetate groups and may corrode downstream metal surfaces. Vacuum degassing at absolute pressures below 80 kPa is commonly used to remove acetic acid and moisture. Unlike acid-functional ethylene copolymers, CM576 does not build viscosity through carboxylate neutralization, but amine-based additives should still be screened because high-pH additives can accelerate deacetylation.
Adhesive formulators typically pre-blend CM576 with tackifying resins, paraffin waxes, and antioxidants before feeding to the extruder. The resin is compatible with rosin esters and aliphatic or aromatic C5/C9 hydrocarbon tackifiers; polyethylene wax additions above 5 wt% may result in phase separation and surface roughness. Batch-to-batch viscosity control is improved when the melt mass-flow rate of incoming pellets is verified before silo blending, because variations of ±1 g/10 min alter bead width and open time on hot-melt dispensing lines. Slot-die coaters running at 50–150 m/min typically apply CM576-based adhesives at 150–170 °C, but optimum temperature depends on tackifier type and coating weight. Published data for this specific formulation configuration is limited; production trials are required to set process limits.
The polar acetate groups in CM576 account for lower contact angle on metallic and glass surfaces compared with low-density polyethylene homopolymer. The adhesion obtained on aluminum, treated polyester, or polyvinyl chloride is not controlled by the resin alone; tackifier acid number, aromatic content, and wax crystallinity govern wet-out and final peel force. Rosin ester tackifiers with softening points above 100 °C may require pre-blending at 120 °C to avoid localized overheating. Hydrocarbon tackifiers modified with aromatic groups improve adhesion to polyester and vinyl surfaces, but excessive aromatic content reduces ultraviolet stability in clear or light-colored compounds.
At 28 wt% vinyl acetate, the ethylene sequence length is sufficiently interrupted to reduce crystallinity and lower the melting peak to approximately 73 °C when measured by differential scanning calorimetry under ISO 11357-3:2018 or ASTM D3418-15. The Vicat softening temperature under the A50 condition is near 54 °C per ISO 306:2022. Shore A hardness is approximately 80 when tested to ISO 868:2003 or ASTM D2240-15e1. These values place the grade below extrusion and molding EVA resins containing 12–18 wt% vinyl acetate in stiffness and heat resistance, but above high-vinyl acetate grades in melt strength. The resin remains flexible at temperatures below −20 °C, although low-temperature brittleness in the final product depends on wax and tackifier concentration.
| Property | Test method | Typical value |
|---|---|---|
| Vinyl acetate comonomer content | ASTM D5594 | 28 wt% |
| Melt mass-flow rate, 190 °C/2.16 kg | ISO 1133-1:2022 / ASTM D1238-23 | 6 g/10 min |
| Density | ISO 1183-1:2019 / ASTM D792-20 | 0.95 g/cm³ |
| Melting peak temperature, DSC | ISO 11357-3:2018 / ASTM D3418-15 | 73 °C |
| Vicat softening temperature, A50 | ISO 306:2022 / ASTM D1525-17e1 | 54 °C |
| Shore A hardness | ISO 868:2003 / ASTM D2240-15e1 | 80 |
Relative to lower-vinyl acetate grades used in packaging film and wire insulation, CM576 accepts higher filler loadings. Calcium carbonate and talc can be incorporated at 20–30 wt% when compounded with a fatty acid lubricant, but the final hardness and tensile properties shift; resin datasheet values do not represent filled compounds. The high vinyl acetate content also permits compatibility with polar flame retardants such as magnesium hydroxide in halogen-free cable compounds, although the grade is not optimized for high-temperature wire jackets requiring a continuous service temperature above 90 °C. When higher modulus or lower elongation is required, blending with low-vinyl acetate extrusion grades or high-density polyethylene is performed to shift the modulus without adopting an entirely different base polymer.
CM576 differs from high-flow hot-melt EVA grades with melt mass-flow rates of 25–43 g/10 min by producing higher melt viscosity at a given temperature. Sprayable hot-melt equipment designed for low-viscosity resins may require nozzle and hose set points above 150 °C to maintain acceptable spray patterns; otherwise cobwebbing and discontinuous adhesive deposition can occur. The higher molecular weight of the 6 g/10 min resin contributes to ambient-temperature creep resistance and cohesive strength in packaging where box flaps are under constant load. In contrast, high-flow grades facilitate lower adhesive add-on and higher line speeds but can exhibit lower peel and shear strength. Acid-functional ethylene copolymer resins often provide higher unprimed metal adhesion than CM576, but their carboxyl groups can react with fillers or alkaline recycling streams and increase viscosity; CM576 remains more tolerant of calcium carbonate and mild alkalinity.
ELVAX CM576 differs from high-pressure EVA grades with 33–40 wt% vinyl acetate in that it has lower surface tack and higher cohesive strength. Grades with 33–40 wt% vinyl acetate are preferred for pressure-sensitive adhesives and flexible tubing because of increased amorphous character, while lower-flow high-VA grades may be too soft for structural hot-melt applications. The 28 wt% comonomer content of CM576 provides an intermediate solubility parameter, making it more compatible with hydrocarbon waxes than very high-vinyl acetate copolymers while retaining sufficient polarity for adhesion to treated polyester and aluminum. Compared with low-density polyethylene homopolymer, the polar acetate groups reduce contact angle on metallic and glass surfaces; the improvement is best captured by mechanical peel testing rather than by surface energy alone.
In wax coatings for corrugated board, CM576 is added at 1–5 wt% to improve scuff resistance, reduce blocking, and raise melt viscosity. Because the grade contains no acid functionality, it is insensitive to the mildly alkaline character of recycled board and does not generate carboxylate gels in the presence of calcium carbonate. This is a key difference from acid-modified EVA terpolymers used for foil adhesion. Unprimed aluminum adhesion of CM576-based coatings is generally lower than that of acid-functional systems, and a primer or adhesion promoter is required when foil-to-film lamination peel strength above 1.0 N/mm is specified under ASTM D1876. For wax blends that require oil retention or high blocking resistance, the resin is often combined with microcrystalline wax; paraffin wax alone may exude under temperature cycling. Published data for this specific CM576 configuration is limited, so coating trials on the target board stock are necessary to confirm blocking and abrasion results.
For low-temperature service, CM576 retains elastomeric behavior below −20 °C, but the brittle point is set by the wax and tackifier package. Hot-melt sealants based on CM576 are used in packaging and general assembly with low-to-moderate joint movement. They are not suitable for facade movement joints requiring displacement capability above ±25% per ISO 11600:2002. Continuous exposure above 70 °C without peroxide or radiation crosslinking may result in creep under load because the crystalline phase melts progressively. Fuel and solvent resistance is limited; EVA copolymers swell in aromatic and oxygenated fluids, and a barrier layer is required in fuel-contact applications.
Regulatory compliance is governed by the finished formulation, not the neat resin alone. The base ethylene vinyl acetate copolymer is typically referenced under FDA 21 CFR 177.1350 for food-contact adhesives and coatings when the finished formulation meets extractive limitations and conditions of use. Under EU 10/2011, final compounds must be migration-tested because tackifiers, waxes, and stabilizers contribute to specific migration limits. The supplier safety data sheet should be checked for REACH 1907/2006/EC registration status and SVHC content above 0.1 wt%. RoHS 2011/65/EU restrictions apply to homogeneous materials in electrical and electronic equipment; the unfilled EVA matrix is not a restricted metal source, but color concentrates, mineral fillers, and flame retardants can alter the compliance status.
On production-scale compounding lines, moisture control and the exclusion of strongly alkaline additives are the principal operational boundaries. Equipment corrosion from acetic acid is managed by venting and neutralization but not eliminated. Formulators should request the latest grade-specific datasheet for ELVAX CM576 and verify the melt flow rate, vinyl acetate content, and volatile content of each lot against the internal specification before bulk handling. In the absence of a published application-specific dataset for the target formulation, pilot-scale coating or extrusion trials remain the only valid method for setting final processing parameters.
