| HS Code | 400885 |
| Product Name | ELEVATE EB502 Ethylene Vinyl Acetate Copolymer |
| Vinyl Acetate Content | 27.5 wt % |
| Melt Index | 2.0 g/10 min (190°C, 2.16 kg) |
| Density | 0.950 g/cm3 |
| Melting Point | 65 °C |
| Crystallization Point | 45 °C |
| Tensile Strength At Break | 14 MPa |
| Elongation At Break | 800 % |
| Flexural Modulus | 18 MPa |
| Shore Hardness | 75 Shore A |
| Vicat Softening Point | 40 °C |
| Brittleness Temperature | -70 °C |
As an accredited ELEVATE EB502 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELEVATE EB502 Ethylene Vinyl Acetate Copolymer is supplied as free-flowing pellets in 25 kg bags, palletized and stretch-wrapped for safe transport. |
| Container Loading (20′ FCL) | 20′ FCL: ELEVATE EB502 EVA copolymer packed in 25 kg bags, palletized, secured, and containerized for safe transport. |
| Shipping | ELEVATE EB502 Ethylene Vinyl Acetate Copolymer is not regulated as hazardous material for shipping. It is supplied as solid pellets in polyethylene-lined bags or bulk containers. Protect from moisture and contamination during transit; store in dry, cool conditions. Standard truck, rail, or containerized ocean freight is acceptable. |
| Storage | Store ELEVATE EB502 Ethylene Vinyl Acetate Copolymer in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly closed when not in use to prevent contamination and moisture pickup. Avoid storage near strong oxidizers. Maintain moderate temperatures; no special hazard if stored properly. |
| Shelf Life | Shelf life is typically two years from manufacture when stored unopened in a cool, dry environment. |
Compression-molded EVA foam for athletic midsoles and orthotic insoles begins with a two-roll mill. ELEVATE EB502 compound is preheated to 90–100 °C and fluxed with dicumyl peroxide and azodicarbonamide blowing agent. Split tear strength on 6 mm plaques measured according to ISO 34-1 Method B typically falls between 2.5 N/mm and 4.5 N/mm in production lots, depending on filler loading and cell size uniformity. Foam density is controlled by blowing agent decomposition efficiency and checked by ISO 845. Commercial midsoles commonly target 0.18–0.25 g/cm³. Batch-to-batch variation in pellet moisture and VA content shifts gel time by 30–60 seconds; the cure plateau must be confirmed by moving-die rheometer before starting a full mold cycle. A production press with 500 metric tons clamp force and steam-heated platens is configured with a breathing cycle during the first 90 seconds to release gas pressure. The cure cycle is restricted to 150–170 °C for 15–20 minutes. If the mold is opened before crosslinking reaches the plateau, foam splits at the parting line. If the cure time exceeds the peroxide half-life at the set temperature by more than 2 minutes, overcure leads to hardness drift and brown discoloration from decomposed blowing agent residues. Compression set is measured after 24 h at 50 °C under 50% recovery using ISO 815-1:2019. Rebound resilience is checked with a Zwick pendulum according to ASTM D2632-15. Pre-drying at 60 °C for 4 h is required when warehouse RH exceeds 60%. Moisture in EB502 pellets increases surface bubbles and inconsistent cell structure. Amine-based release agents must be excluded because they scavenge peroxide radicals and reduce crosslink density. Zinc oxide at 0.5–1.0 phr is often added to control residual acidity, but levels above 2.0 phr can accelerate blowing agent decomposition and generate oversized cells in the sole core.
Laminators running EB502-based encapsulant films record failures as two distinct mechanisms: interfacial delamination at the glass edge after damp heat exposure, and bulk yellowing that reduces short-circuit current. A formulation containing ELEVATE EB502, triallyl isocyanurate co-agent, and non-yellowing bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate HALS is compounded at 100–120 °C in a co-rotating twin-screw extruder with L/D 44:1. The extrudate is cast into 0.45 mm film through a gear pump and chill roll stack. Gel content after lamination at 145–155 °C for 12–15 minutes is measured by xylene extraction. Acceptable adhesion to glass requires gel content above 70% according to ASTM D2765-16 Method A. Optical transmittance is measured according to ASTM D1003-21 and must exceed 91% for 0.45 mm film. Crosslinking time is determined by moving-die rheometer at 150 °C; t90 values for peroxide systems typically occupy 8–14 minutes. Acetic acid released during damp heat is a known degradation product. The glass edge must be evaluated after 1000 h of damp heat according to IEC 61215-2:2021. If edge pH drops below 4.0, the encapsulant formulation is judged unacceptable for long-term module service. Pre-drying at 60 °C for 4 h is required when relative humidity exceeds 60%. Avoid combination with amine-based slip agents, as amine residues reduce peroxide cure efficiency and promote haze. Published data for EB502-specific encapsulant formulations is limited; pre-qualification on a 1.2 m pilot lamination line is recommended before committing to full-width production.
| Test property | Standard or method | Measurement condition | Industrial acceptance criterion |
|---|---|---|---|
| Optical transmittance | ASTM D1003-21 | 0.45 mm plaque, illuminant C | ≥ 91% |
| Yellowness index | ASTM E313-20 | same plaque after 500 h damp heat | ΔYI ≤ 2.0 |
| Peel adhesion to glass | IEC 61215-2:2021 | after lamination, 180° peel | ≥ 20 N/cm |
| Volume resistivity | IEC 60093 | 500 V DC, 23 °C | ≥ 1 × 1014 Ω·cm |
| Gel content after cure | ASTM D2765-16 Method A | 150 °C, 12 min | ≥ 70% |
Slot-die coating trials on high-speed packaging lines reveal that ELEVATE EB502-containing hot-melt formulations require tighter viscosity control than standard EVA packaging grades. Brookfield viscosity at 180 °C is measured with a Thermosel system according to ASTM D3236-15. Industrial packaging adhesives typically hold 500–1500 mPa·s at the application temperature. A formulation containing 30–40 wt% EB502, 35–50 wt% hydrogenated rosin ester, and 10–20 wt% Fischer-Tropsch wax delivers acceptable adhesion to corrugated board and clay-coated carton stock. The adhesive is applied through a heated slot die at 160–180 °C onto the substrate at coating weights between 1.5 g/m² and 3.0 g/m². Open time is measured on corrugated board at 23 °C and 50% RH. Set time must remain below 2.5 seconds for high-speed case sealing lines. Heat resistance is tested by shear adhesion failure temperature according to ASTM D4498-07. Production melters must be blanketed with nitrogen to prevent char formation at the tank bottom. If viscosity drift exceeds 10% after 8 h at 180 °C, the adhesive must be purged. Amine-based wax or amine-functionalized adhesion promoters must not be used because they accelerate deacetylation of EB502 and raise acid number. T-peel strength on corona-treated polyethylene film is measured according to ASTM D1876-08. Values below 2.0 N/mm after 24 h conditioning indicate inadequate cohesive strength or insufficient substrate wetting. Equipment experience on production melters shows that cold spots below 150 °C in heated hoses create gel particles that block the slot die lip. The use of an in-line melt filter at 200 μm is mandatory when recycled corrugated board dust is present.
Flame-retardant cable jacketing compounds based on ELEVATE EB502 are filled with aluminum trihydrate between 120 phr and 180 phr. The high filler surface area creates an extensional viscosity plateau that raises barrel pressure in 19 mm twin-screw extruders with L/D 44:1. A two-stage vented screw with distributive mixing elements is used. The compound is pre-dried at 65 °C for 4–6 h when RH exceeds 60%. Silane coupling, such as vinyltriethoxysilane at 0.5–1.0 phr, is added by side feed to lower melt temperature and improve tensile elongation. Limiting oxygen index measured to ASTM D2863-17 increases with ATH loading: 28% at 120 phr, 33% at 150 phr, and 38% at 180 phr. Tensile elongation at break measured to ASTM D638-14 falls below 150% at 180 phr. This trade-off defines the formulation boundary for IEC 60332-1-2 vertical flame performance. Smoke acidity is checked by IEC 60754-2; pH of effluent must remain above 4.3. Zinc stearate in the formulation stabilizes acid scavenging, but at levels above 1.5 phr it plates out on the extrusion die and causes surface roughness. The use of magnesium hydroxide at ATH:MDH ratios from 50:50 to 70:30 shifts the decomposition endotherm to 340 °C, reducing water release in the screw. Screw torque and melt pressure are monitored continuously. A pressure rise beyond 25% from the initial stable value indicates filler agglomeration or insufficient coupling agent. The finished cable jacket is tested for tensile strength and elongation after thermal ageing at 100 °C for 168 h according to IEC 60811-501. Elongation retention below 80% after ageing indicates excessive acid development or inadequate stabilizer loading.
A split-feed twin-screw compounding line running 40 wt% carbon black masterbatch into linear low-density polyethylene blown film has a narrow processing window for carrier resin selection. ELEVATE EB502 serves as the carrier phase when the letdown ratio is fixed at 5:1 to 10:1. The twin-screw extruder is specified with L/D 40:1 and a side feeder at barrel 6. Distal vacuum venting at -0.08 MPa removes water and low-molecular-weight volatiles. Melt temperature must not exceed 200 °C to suppress deacetylation. The pressure filtration value is measured according to ASTM D5596-17 on a 12 μm filter medium. Masterbatch with excess undispersed carbon black above 0.5 ppm pressure rise is rejected. Finished blown film is tested for pigment dispersion according to ISO 18553:2021. Carrier melt mass-flow rate in the range 2.0–3.0 g/10 min at 190 °C and 2.16 kg balances wetting against pellet hardness. A carrier with too low a melt index causes screw surging and poor dilution in the blown film extruder. A carrier with too high a melt index generates pellet deformation during bulk rail shipment and dust generation at the feed hopper. Field measurements on 75 mm blown film lines show that melt temperature in the die must remain below 180 °C for EB502-based masterbatch to avoid acetic acid odor at the nip. Chromium-plated screw and barrel surfaces reduce corrosive wear. The feed throat must be jacketed at 20–30 °C to prevent pellet bridging. No amine-based antioxidant should be used in the masterbatch because it migrates into the final film and reduces heat seal strength after 30 days storage at 35 °C.
Extrusion coating of ELEVATE EB502-based sealant webs onto oriented polyester or biaxially oriented polypropylene requires tight control of melt temperature between 250 °C and 290 °C. Seal initiation temperature is measured by ASTM F2029-16. Hot tack strength is measured by ASTM F1921-18. Typical seal initiation of 80–90 °C is targeted for high-speed vertical form-fill-seal lines. The extrudate is coated at 15–25 g/m² onto primed film with an air gap of 150–250 mm. Chill roll temperature is held at 15–25 °C. Food contact compliance is evaluated under FDA 21 CFR 177.1350 and EU No 10/2011 with migration tests using the prescribed food simulants. Overall migration must remain below 10 mg/dm² under EU No 10/2011. Film seal strength is tested by ASTM F88/F88M-21. Bond strength of laminated structures is tested by ASTM F904-16. If melt temperature exceeds 300 °C, deacetylation accelerates and forms acetic acid, which corrodes die lips and creates pinholes in the sealant web. Pre-drying at 60 °C for 4 h is required at RH above 60%. Unneutralized fatty acid slip agents must be avoided because they accelerate seal strength decay after moisture contact. The sealant layer must not be combined with bare aluminum foil without an intervening tie layer when the package will contact acidic liquids; acetic acid generated during extrusion can attack the foil surface and reduce laminate adhesion. Cast film lines running this product monitor die lip buildup every 8 h. Excessive buildup indicates stabilizer incompatibility or excessive melt temperature. The web path after the chill roll is controlled to avoid blocking because EVA sealant surfaces develop blocking force above 0.3 N/cm at roll temperatures above 30 °C.
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ELEVATE EB502 ethylene vinyl acetate copolymer is a thermoplastic pellet resin in which 5.0 wt% vinyl acetate comonomer is incorporated along the polyethylene backbone. The resulting short-chain branching reduces crystalline order relative to low-density polyethylene homopolymer while retaining a density of 0.926 g/cm³ when measured in accordance with ASTM D1505-18. Melt flow indexing under 190 °C and 2.16 kg load returns a nominal value of 2.0 g/10 min per ASTM D1238-20. Differential scanning calorimetry following ASTM D3418-15 places the peak melting endotherm at approximately 103 °C. The grade is positioned for conventional polyolefin melt processing, including extrusion coating, coextrusion, cast film, and blow moulding; however, exact lot-specific values shift with additive loading and catalyst residue, and the manufacturer’s current datasheet should be referenced before setting release limits.
At the specification level, the low vinyl acetate content separates EB502 from higher-vinyl-acetate EVA copolymers. The material retains enough nonpolar crystallinity to provide room-temperature stiffness and melt strength, while the acetate side groups introduce polar interactions that improve adhesion to aluminium foil, ethylene vinyl alcohol, polyamide, and paperboard. The melt flow index of 2.0 g/10 min places the material in the medium-viscosity extrusion range. This is relevant for cast film and extrusion lamination lines where draw-down capability must be balanced against neck-in and melt curtain stability. In that context, the grade is typically selected where a moderate shift in heat-seal response is required without moving fully into the blocking, tack, and thermal-instability behaviour of high-VA sealants.
The primary difference from LDPE is chemical polarity. Vinyl acetate repeat units alter the electron distribution at the chain surface, which increases peel adhesion and reduces heat-seal initiation temperature relative to LDPE of equivalent melt index. In extrusion lamination, EB502 typically permits a 15–20 °C reduction in heat-seal initiation temperature compared with LDPE, while retaining higher modulus than EVA grades containing 9–14 wt% vinyl acetate. The effect on environmental stress crack resistance is similarly directional: ASTM D1693 testing of 5.0 wt% VA EVA generally shows markedly longer failure times than fractional-melt LDPE of similar density, although values are highly dependent on test geometry and sheet orientation.
Comparative published values for the property gradient across vinyl acetate content are shown below. The table is intended to demonstrate structural shift rather than serve as a procurement specification.
| Property | ELEVATE EB502 | 9 wt% VA EVA | 14 wt% VA EVA | 18 wt% VA EVA | 28 wt% VA EVA |
|---|---|---|---|---|---|
| Vinyl acetate content | 5.0 wt% | 9.0 wt% | 14.0 wt% | 18.0 wt% | 28.0 wt% |
| Density ASTM D1505 | 0.926 g/cm³ | 0.930 g/cm³ | 0.934 g/cm³ | 0.939 g/cm³ | 0.950 g/cm³ |
| Peak melt temperature ASTM D3418 | 103 °C | 98 °C | 92 °C | 85 °C | 72 °C |
| Shore D hardness ASTM D2240 | 56 | 48 | 42 | 36 | 25 |
| Vicat softening point ASTM D1525 | 82 °C | 74 °C | 66 °C | 55 °C | 42 °C |
The effect of vinyl acetate content on seal initiation is non-linear. EB502 retains a seal initiation temperature in the 105–115 °C range for 30 µm cast film at 0.5 N/15 mm measured under ASTM F2029. Moving to 14 wt% VA lowers the same response by approximately 15–25 °C, but also increases blocking force and requires higher slip and antiblock loadings to maintain reel integrity. In high-speed web conversion, the lower-VA product therefore reduces dependence on migratory slip additives that can interfere with print adhesion and lamination bond strength.
Processing equipment must be configured to limit residence time above 220 °C. Deacetylation of the vinyl acetate comonomer is kinetically significant above 230 °C; acetic acid evolved at the die or barrel can corrode unplated carbon steel and create pinholes in extrusion coating. Preferred barrel profiles run from 150 °C at the feed throat to 220 °C at the metering section, with a die temperature no greater than 230 °C. Screws with 24:1 to 30:1 L/D and compression ratios in the 3.0:1 to 3.5:1 range are used on single-screw extrusion coating lines; barrier screws with Maddock mixers improve melt temperature uniformity when throughput exceeds 200 kg/h.
The thermal processing window is not merely a quality issue; it defines equipment selection. If the melt is held at 230 °C for more than 20–30 min, measurable viscosity loss and gel formation occur. At 250 °C, acetic acid liberation becomes rapid, and the melt phase begins to cross-oxidize unless the hopper is nitrogen-blanketed. These constraints make EB502 more thermally forgiving than 28 wt% VA grades, but less forgiving than LDPE. Processors transferring from LDPE must shorten melt path length and verify thermocouple accuracy at the die adaptor within ±2 °C to avoid operating near the deacetylation threshold.
For extrusion coating, melt curtain stability is controlled by the relationship between melt strength and draw-down. EB502 at 2.0 g/10 min can be drawn to 15 g/m² on standard polyolefin coating lines, but neck-in increases when line speed exceeds 300 m/min or when air gap exceeds 150 mm. Maintaining air gap between 100 mm and 150 mm and chill-roll temperature between 15 °C and 25 °C helps control crystallinity and seal strength. Low chill-roll temperatures quench the amorphous phase and retain sealability, whereas higher roll temperatures increase crystallinity and reduce blocking but may raise seal initiation temperature by 3–5 °C.
In coextruded films, EB502 is placed as a sealant skin adjacent to LDPE or as a tie layer between polyethylene and a polar barrier. Layer-to-layer viscosity matching matters more than melt index alone: the shear viscosity at 1–100 s−1 should remain within a 3:1 ratio of adjacent layers to prevent interfacial waviness and poor gauge uniformity. With a melt index of 2.0 g/10 min, EB502 stratifies cleanly against fractional-melt LDPE but may require a higher-melt-index carrier when extruded with HDPE of 0.5 g/10 min or lower.
Seal strength is evaluated under ASTM F88. For a 50 µm coextruded film with a 5 µm EB502 seal layer, heat-seal initiation at 2.0 N/15 mm is observed near 115 °C, while plateau seal strength reaches 8–12 N/15 mm when sealed at 130–150 °C. The lower-VA grade does not offer the very low initiation temperatures of 14–18 wt% VA grades, but it reduces seal-through contamination and improves hot-tack geometry stability on vertical form-fill-seal machines operating above 60 cycles/min. In addition, the lower tack after sealing reduces jaw build-up on repeat packaging runs.
Specific production-scale uses include extrusion lamination of aluminium foil to paperboard for aseptic and dry food cartons, sealant layers in non-implantable medical packaging where moderate seal strength and low odour are required, and stiff profiles and closures where low-temperature flexibility relative to LDPE is necessary. In each case, the utility of EB502 is not higher overall performance but a narrower property envelope: it moves the seal curve downward from LDPE without moving into the blocking and thermal-instability issues of high-VA grades.
For food-contact applications, the copolymer falls under FDA 21 CFR 177.1350 when the vinyl acetate content does not exceed the limits described in the regulation. It is also assessed under European Commission Regulation (EU) No 10/2011, with overall migration measured to the 10 mg/dm² limit specified in Annex II for general food-contact plastics. RoHS recast 2011/65/EU and REACH 1907/2006 compliance requires confirmation against current certificates of analysis because residual catalyst and additive formulations vary by production campaign.
Storage before processing should maintain pellet temperature below 50 °C and relative humidity below 60%. Although EVA is not strongly hygroscopic, surface moisture films formed during condensation can produce melt-freeze defects at the feed throat and cause intermittent screw slip. If silo or hopper conditions exceed 70% RH, predrying at 65 °C for 2–4 h in a desiccant dryer is recommended. Avoid blending with amine-based processing aids, which can accelerate hydrolysis of the acetate side groups and shift melt pH. Equipment purging between campaigns should use fractional-melt LDPE or a commercial polyolefin purge compound; prolonged hold-up at temperature should be avoided by running the extruder down to head pressure below 20 bar before shutdown.
Within the ELEVATE product line, EB502 sits between lower-melt-index grades intended for blown film and higher-melt-index grades intended for coating. A product with a melt index of 2.0 g/10 min is not optimized for very thin 8 µm extrusion coating at maximum speed; a 7–8 g/10 min grade would reduce neck-in and permit lower coating weights. Conversely, EB502 retains higher melt strength and better bubble stability in air-cooled blown film than high-melt-index EVA grades. Selection between EB502 and adjacent ELEVATE grades therefore depends on the dominant converting mode, target coating weight, and acceptable seal-initiation trade-off. Published data for this specific configuration is limited where downstream conversion includes both high-speed coating and vertical form-fill-seal sealing; in such cases, pilot-line confirmation under the intended film structure is the most reliable basis for specification.
