| HS Code | 505473 |
| Product | ELVAX CM3326 Ethylene Vinyl Acetate Copolymer |
| Chemical Family | Ethylene Vinyl Acetate (EVA) Copolymer |
| Vinyl Acetate Content | 33 wt% |
| Melt Flow Rate | 26 g/10 min (190°C, 2.16 kg) |
| Density | 0.980 g/cm³ |
| Melting Point | 70 °C |
| Crystallization Temperature | 45 °C |
| Vicat Softening Point | 48 °C |
| Glass Transition Temperature | -35 °C |
| Tensile Strength At Break | 6.9 MPa |
| Elongation At Break | 800 % |
| Flexural Modulus | 22 MPa |
| Shore D Hardness | 35 |
| Brittleness Temperature | -100 °C |
As an accredited ELVAX CM3326 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX CM3326 ethylene vinyl acetate copolymer pellets are packaged in 25 kg kraft paper bags, ensuring easy handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL loading of ELVAX CM3326 EVA copolymer: palletized, shrink-wrapped bags, evenly distributed, secured, dry, clean, and contamination-free. |
| Shipping | ELVAX CM3326 is supplied as solid pellets in moisture-resistant bags or supersacks. Non-hazardous for transport, it ships via standard freight. Store in a cool, dry area, away from direct sunlight and heat sources to prevent agglomeration. Ensure containers are sealed to avoid moisture pickup during transit. |
| Storage | Store ELVAX CM3326 in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly closed to prevent moisture pickup and contamination. Avoid generating dust; use proper grounding when handling. With correct storage, the ethylene vinyl acetate copolymer remains stable with a long shelf life. |
| Shelf Life | Shelf life is typically two years when stored in original, unopened containers away from heat, moisture, and direct sunlight. |
On high-speed carton sealing lines running at 300 m/min to 450 m/min, hot-melt adhesives formulated with ELVAX CM3326 are compounded in jacketed vertical mixers with anchor agitation at 170°C to 180°C. The resin is blended with hydrogenated hydrocarbon tackifier and Fischer-Tropsch wax within the following mass-fraction window: ELVAX CM3326 30 wt% to 40 wt%, tackifier 30 wt% to 45 wt%, wax 15 wt% to 30 wt%, and antioxidant 0.5 wt% to 1.0 wt%. Melt viscosity measured according to ASTM D3236 at 180°C ordinarily falls between 500 mPa·s and 1,500 mPa·s for packaging-grade formulations. Open time and adhesion are evaluated by ASTM D4498 shear adhesion failure temperature and ASTM D1876 T-peel testing on aluminum foil or cardboard. Addition above 40 wt% of this 33 wt% vinyl acetate copolymer extends open time beyond the cycle tolerance of high-speed case erectors, while addition below 30 wt% reduces fiber-tear bond strength on recycled corrugated board under cold-chain conditions at −20°C. Thermal stability during production is maintained by limiting hold time to 8 h at 180°C unless inert gas blanketing is applied. Compliance for food-packaging indirect contact falls under FDA 21 CFR 175.105; the resin may also be used in food-contact layers subject to FDA 21 CFR 177.1350 end-use limitations. Documentation under REACH and RoHS 2011/65/EU is required for export-grade adhesive compounds. Downstream productive uses include case and carton sealing, bookbinding spine glue, profile wrapping, and paper lamination.
Storage stability of EVA-modified bitumen at 180°C is controlled by the density difference between the polymer-rich phase and the maltene-rich phase. ELVAX CM3326 is introduced at 3 wt% to 7 wt% based on bitumen mass into penetration-grade 70/100 or 50/70 bitumen in a high-shear rotor-stator mixer operating at 3,000 rpm to 5,000 rpm for 60 min to 180 min. The processing temperature is held between 170°C and 190°C; above 200°C oxidative degradation of both bitumen and EVA produces a measurable viscosity rise and gel formation. Addition below 3 wt% typically fails to meet EN 14023 polymer-modified bitumen requirements because elastic recovery remains below 40%. Addition above 7 wt% may increase separation in static tube testing beyond a 5°C softening-point difference per EN 13399. The 33 wt% vinyl acetate content provides higher polarity than low-VA grades, improving adhesion to damp aggregate and reducing moisture-induced stripping in asphalt mixes evaluated by ASTM D4867. The compounded binder is transferred to maturation tanks with low-shear agitation at 150°C for 4 h before road or waterproofing application. Quality control includes EN 1427 softening point, EN 1426/ASTM D5 penetration, EN 13302/ASTM D4402 dynamic viscosity at 135°C, EN 13398 elastic recovery, and ASTM D5976 specification conformance. Partial replacement of SBS with 1 wt% to 2 wt% ELVAX CM3326 plus 2 wt% to 3 wt% SBS is practiced on some production lines to reduce formulation cost while preserving low-temperature flexibility; published data for this specific blend configuration within EN 14023 classification is limited. Finished downstream types include polymer-modified bitumen for highway paving, airport runways, bridge deck waterproofing, and heavy-duty roofing membranes.
When a halogen-free flame-retardant jacket compound is formulated with ELVAX CM3326 as the base polymer, the twin-screw compounding step must keep melt temperature below 180°C to prevent premature release of water from aluminum trihydrate. A production-scale starting formulation is: ELVAX CM3326 35 wt%, aluminum trihydrate 60 wt%, magnesium hydroxide 5 wt%, processing oil 4 wt%, antioxidant 1.0 wt%, and zinc borate 5 wt%. Raising aluminum trihydrate above 65 wt% increases compound melt viscosity above 1,500 Pa·s at 160°C and can cause screw slippage on 40:1 L/D co-rotating twin-screw extruders. After compounding, the pellets are pre-dried at 70°C for 4 h when storage relative humidity exceeds 60%. Jacket extrusion uses a single-screw extruder with 25:1 L/D, barrier screw geometry, and melt filtration through 80 mesh to 120 mesh screens. Melt temperature at the die is held at 160°C to 180°C. Use of amine-containing flame retardants is avoided because melamine-based additives can produce yellowing and surface plate-out after 24 h continuous extrusion at 170°C. Compliance testing includes IEC 60754-1 and IEC 60754-2 for halogen acid gas, pH, and conductivity, ASTM D2863 limiting oxygen index above 30% O₂, UL 94 V-0 at 1.5 mm thickness, and flame-retardant jacket requirements under UL 1581. Published data for ELVAX CM3326 in thin-wall automotive cable configurations is limited; compounders should validate insulation resistance and thermal aging on production-speed lines. Terminal products include low-voltage control cable jackets, photovoltaic cable, industrial power cable, and automotive battery cable sheathing.
| Parameter | Standard | Typical acceptance threshold |
|---|---|---|
| Halogen acid gas content | IEC 60754-1 | 0.5% maximum HCl equivalent |
| Aqueous pH | IEC 60754-2 | 4.3 minimum |
| Conductivity | IEC 60754-2 | 10 µS/mm maximum |
| Limiting oxygen index | ASTM D2863 | 30% O₂ minimum |
| Vertical flame | UL 94 | V-0 at 1.5 mm |
For carbon black and organic pigment masterbatches destined for polyolefin film, 33 wt% vinyl acetate grades such as ELVAX CM3326 serve as the carrier resin at 60 wt% to 85 wt% of the masterbatch mass, with pigment loading between 15 wt% and 40 wt% depending on pigment BET surface area and oil absorption. The dispersive mixing step is performed on a co-rotating twin-screw extruder with 40:1 L/D to 48:1 L/D, screw speed of 300 rpm to 600 rpm, and barrel temperature profile from 150°C to 190°C. The polar vinyl acetate segments wet pigment surfaces and reduce agglomerate survival, but shear-thinning at screw speeds above 600 rpm can reduce dispersive mixing by lowering melt viscosity. Barrel temperatures above 200°C may generate detectable acetic acid odor from vinyl acetate decomposition. In blown film or extrusion coating, the masterbatch is let down at 1 wt% to 5 wt%, yielding final pigment concentrations of 0.3 wt% to 1.0 wt% in the end article. Higher let-down ratios may cause screw slippage on grooved-feed film extruders because of the low melting point and high melt flow rate of the carrier. Compliance documentation includes ISO 11469 for polymer identification, EU 10/2011 for food-contact plastic components, REACH, and RoHS 2011/65/EU. Terminal downstream uses include LDPE/LLDPE carrier films, injection-molded closures, EVA foam colorants, and polyolefin agricultural film.
Container candle and pillar wax production using ELVAX CM3326 at 1 wt% to 5 wt% requires low-shear blending in a steam-jacketed melting tank at 90°C to 110°C for 30 min to 60 min until optical clarity is achieved. In this addition range, the copolymer increases wax hardness, reduces oil bleed, and improves fragrance retention in wax melts. Fragrance and liquid dye are injected below 85°C to reduce flash-off, and filling into containers is performed at 80°C to 85°C. Cooling rate is controlled from 0.5°C/min to 1.0°C/min to avoid sink holes and secondary crystallization. Test methods include ASTM D87 for wax melting point, ASTM D938 for congealing point, ASTM D1321 for needle penetration, and ASTM F2417 for candle fire safety. Addition above 5 wt% produces elevated melt viscosity that interferes with proper wicking and can increase combustion soot from incomplete polymer volatilization. Published quantitative emission data for this exact EVA grade in candle systems is limited. Terminal products include container candles, pillar candles, wax melts, and corrugated board wax coatings.
Compounding crosslinked EVA foam with ELVAX CM3326 on open-mill or internal mixer lines begins by fluxing the resin with stearic acid at 0.5 phr to 1.0 phr and zinc oxide at 1.0 phr to 3.0 phr at roll temperatures of 95°C to 105°C. Azodicarbonamide is then added at 1.5 phr to 3.0 phr and dicumyl peroxide at 0.5 phr to 1.2 phr. Because ELVAX CM3326 has a melt flow rate of 43 g/10 min at 190°C/2.16 kg per ISO 1133-1:2022, it is generally blended with a low-melt-index EVA or polyolefin elastomer at 20 wt% to 50 wt% of the polymer phase to maintain green strength and prevent bubble coalescence during expansion. Foaming and crosslinking occur simultaneously in compression presses at 150°C to 170°C for 8 min to 12 min. Mold pressure is released at final expansion, and the part is cooled under constraint to reduce dimensional rebound. Typical density targets for athletic footwear are 0.15 g/cm³ to 0.30 g/cm³. Quality control includes ISO 845 apparent density, ISO 1798 tensile strength, ISO 815-1 compression set, and SATRA TM64 abrasion. Peroxide levels below 0.5 phr can produce compression set above 60% after 24 h at 70°C. Terminal products include EVA midsoles, insoles, sandal sheeting, and shock-absorbing packaging foams.
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ELVAX CM3326 Ethylene Vinyl Acetate Copolymer is a pelletized ethylene–vinyl acetate random copolymer supplied under the ELVAX trade designation. The grade carries a vinyl acetate comonomer content of 33 wt% and a melt flow rate of 4.0 g/10 min when measured at 190°C under a 2.16 kg load according to ISO 1133-1:2022. The vinyl acetate content lowers crystallinity, increases polar adhesion, and improves low-temperature flexibility relative to ethylene-rich EVA grades. The relatively low melt flow rate provides higher melt strength and higher extensional viscosity than high-MFR EVA copolymers of similar comonomer content. Typical property values published by the resin producer are listed in Table 1. The values are intended for material identification and are not specification limits.
| Property | Test method | Typical value |
|---|---|---|
| Vinyl acetate content | ASTM D5594 | 33 wt% |
| Melt flow rate, 190°C/2.16 kg | ISO 1133-1:2022 | 4.0 g/10 min |
| Density | ISO 1183-1:2019 | 0.96 g/cm³ |
| Vicat softening temperature | ASTM D1525-17e1 | 48°C |
| Shore A hardness | ISO 868:2003 / ASTM D2240-15 | 68 |
| Tensile strength at break | ISO 527-2/5A/500 | 10 MPa |
| Elongation at break | ISO 527-2/5A/500 | 800% |
| Melting point by DSC | ISO 11357-3:2018 | 64°C |
The principal differences between CM3326 and lower vinyl acetate EVA grades are controlled by comonomer content and melt flow rate. Table 2 compares typical published values for selected ELVAX grades. The 33 wt% vinyl acetate content of CM3326 reduces Shore A hardness and Vicat softening temperature while increasing adhesion to polar substrates and compatibility with tackifiers and plasticizers. An 18 wt% vinyl acetate grade such as ELVAX 450 exhibits higher hardness and heat resistance but lower polar wetting. A higher-MFR grade of the same 33 wt% vinyl acetate content, ELVAX 150W, displays approximately one order of magnitude lower melt viscosity, which permits lower application temperatures in hot-melt processes but reduces melt strength for profile extrusion and calendering.
| Grade | Vinyl acetate | MFR, 190°C/2.16 kg | Density | Shore A | Vicat softening |
|---|---|---|---|---|---|
| ELVAX CM3326 | 33 wt% | 4.0 g/10 min | 0.96 g/cm³ | 68 | 48°C |
| ELVAX 150W | 33 wt% | 43 g/10 min | 0.96 g/cm³ | 68 | 50°C |
| ELVAX 265 | 28 wt% | 3 g/10 min | 0.95 g/cm³ | 75 | 56°C |
| ELVAX 450 | 18 wt% | 8 g/10 min | 0.94 g/cm³ | 85 | 70°C |
For hot-melt adhesive compounding, CM3326 is charged into a jacketed sigma-blade mixer of 300–500 L working capacity equipped with scrape-wall blades and thermal oil heating. The mixer temperature is set at 160–180°C. Resin pellets are melted first to form a clear melt; hydrocarbon tackifying resin is then added gradually, followed by microcrystalline wax and a hindered phenolic antioxidant at 0.5–1.0 wt%. Torque rises during resin pellet fusion and again during tackifier incorporation, then falls after wax addition. Discharge is performed at 170–180°C through a heated gate extruder or directly onto a water-cooled belt pastillator. Batch-to-batch viscosity variation is controlled by monitoring melt viscosity at 180°C with a Brookfield Thermosel according to ASTM D3236-15. Formulations using CM3326 instead of a 28 wt% vinyl acetate grade typically show longer open time and improved low-temperature adhesion, but the actual performance depends on tackifier softening point and wax melting range. Published data for this specific formulation configuration is limited, so pilot-line adhesion testing on the intended substrate is required before production qualification.
On a co-rotating twin-screw extruder with L/D 40:1 and gravimetric feeders, CM3326 is processed with barrel zones set from 120°C to 180°C and a die melt temperature of 190–210°C. For filled compounds containing aluminum trihydrate at loadings exceeding 55 wt%, screw speed is typically limited to 250–350 rpm to avoid excessive shear heating; specific energy input is recorded continuously to detect feeder drift. The resin must not be exposed to melt temperatures above 230°C for extended residence time because vinyl acetate sequences can undergo acetic acid elimination. During line stoppage, the extruder should be flushed with a low-density polyethylene or lower-VA EVA purge at 140–160°C before restart. Pellets stored at relative humidity above 60% are dried at 70°C for 2 h in a desiccant dryer with a dew point of ≤ -30°C before processing, although the base resin is not strongly hygroscopic.
In peroxide-crosslinked sheet used as photovoltaic encapsulant or heat-seal layer, CM3326 is dry-blended with a peroxycarbonate initiator such as tert-butyl peroxy-2-ethylhexyl carbonate at 0.6–1.0 wt%, a methacryloxy silane adhesion promoter at 0.2–0.5 wt%, and a hindered phenolic antioxidant at 0.1–0.3 wt%. The compound is cast as film or sheet, then cured in a vacuum laminator at 145–155°C for 8–12 min. Cure rheology is monitored by moving die rheometer at 150°C according to ASTM D5289, with acceptance typically based on minimum torque and t90 cure time. Because vinyl acetate increases polarity, the copolymer accepts silane grafting more readily than low-VA or metallocene polyolefin grades. Published data for this exact formulation is limited, so thermo-oxidative stability of the crosslinked sheet should be verified by oxidative induction time at 200°C per ISO 11357-6:2018.
At equivalent formulation, the lower melt flow rate of CM3326 increases melt pressure before the die and raises residence time in the front end of the extruder. Foam extrusion lines using a chemical blowing agent such as azodicarbonamide at 0.5–1.2 wt% can compensate by raising metering-zone barrel temperature by 5–10°C. The higher melt strength improves cell integrity, but shear heating also increases, so screw speed should be reduced by approximately 10–15% until die pressure stabilizes. This operational adjustment is consistent with extrusion-grade EVA behavior; published data for this specific configuration is limited.
In halogen-free flame-retardant cable compounds, CM3326 is combined with aluminum trihydrate and magnesium dihydrate at total filler loadings up to 60–65 wt%. The polar vinyl acetate segments improve filler wetting and reduce filler agglomeration compared with low-VA EVA or polyethylene. Compounding is performed on a continuous mixer or twin-screw extruder with downstream pelletizing. Tensile elongation retention after thermal ageing is tested according to IEC 60811-401:2012 or the applicable cable material specification. High filler loading raises melt viscosity and limits maximum line speed; the lower melt flow rate of CM3326 helps preserve mechanical properties after filler addition but requires close control of extruder torque and die temperature. Published data for this specific configuration is limited.
The base resin is typically assessed for food-contact applications under FDA 21 CFR 177.1350 for ethylene–vinyl acetate copolymers. Finished adhesives must still comply with 21 CFR 175.105 or applicable migration limits. Users must confirm REACH registration status and substance-of-very-high-concern content for the specific supply source. The material should be stored away from open flame and strong oxidizers. Decomposition above 230°C releases acetic acid, carbon monoxide, and hydrocarbon fragments. Additives containing free amine groups should be evaluated for color generation during prolonged melt contact.
