| HS Code | 740636 |
| Product | EVATHENE UE3302 |
| Resin Type | EVA Copolymer |
| Va Content | 33% |
| Melt Flow Index | 30 g/10min |
| Density | 0.95 g/cm³ |
| Tensile Strength At Break | 12.7 MPa |
| Elongation At Break | 700% |
| Hardness Shore A | 72 |
| Vicat Softening Point | 40 °C |
| Ring And Ball Softening Point | 95 °C |
| Brittle Temperature | -70 °C |
| Melting Point | 62 °C |
As an accredited EVATHENE UE3302 EVA Copolymer Resin,33% VA,Foam & Footwear Grade factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg net bags as free-flowing pellets. EVATHENE UE3302 EVA copolymer resin, 33% VA, for foam and footwear applications. |
| Container Loading (20′ FCL) | 20′ FCL: 25 kg bags on pallets, shrink-wrapped and ventilated, loading approximately 20 metric tons per container for safe transport. |
| Shipping | EVATHENE UE3302 EVA resin ships as non-hazardous solid granules in 25 kg bags, bulk bags, or silo trucks. Store in dry, cool conditions away from heat and direct sunlight. Protect packaging from damage and moisture; use safe lifting for pallets. Standard dry cargo containers or covered trucks are suitable. |
| Storage | Store EVATHENE UE3302 in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep the original container tightly sealed to prevent moisture absorption and contamination. Recommended storage temperature is below 30°C. Under these conditions, the resin remains stable with minimal property change for at least one year. |
| Shelf Life | Shelf life is typically one year from manufacture; store in a cool, dry place away from heat, sunlight, and moisture. |
Application scope for EVATHENE UE3302 EVA copolymer resin, 33% VA foam and footwear grade, is restricted to downstream conversion routes where crosslinked closed-cell EVA is the primary matrix. The scenarios below are separated by process class rather than product marketing categories; each scenario specifies formulation addition windows, regulatory references, production equipment boundaries, and terminal article types. Melt mass-flow rate for this grade should be verified against the certificate of analysis under ISO 1133-1:2022 before setting extruder or injection barrel conditions. This grade should not be considered certified for food-contact articles under EU 10/2011 or FDA 21 CFR 177.1520 unless migration testing is completed on the finished foam.
Compression-molded slabstock lines processing UE3302 into crosslinked sheet for athletic and casual footwear midsoles typically prescribe 100 phr resin, azodicarbonamide 2.4–3.8 phr, dicumyl peroxide 0.55–0.75 phr, zinc oxide 0.8–1.5 phr, zinc stearate 0.6–1.2 phr, and calcium carbonate 10–30 phr. The 33% VA content lowers crystalline melting and broadens the thermal processing window relative to 18% VA grades, but it also increases mill tack after the internal mixer; in production, Banbury drop temperature is held at 108–112°C, and the two-roll mill is run at a friction ratio of 1:1.2 with front roll temperature 85–90°C to prevent sticking. Sheet pre-forms are then pressed in multi-daylight hydraulic presses at 170–175°C for 7–9 min per 10 mm of thickness; at cavity fill below 85%, localized cell coalescence and high compression set are observed. Compliance for finished slabstock supplied to EU and US footwear converters includes ASTM D3574-17 constant-deflection compression set at 50% deflection, ASTM D792-20 density, ASTM D2240-15 Shore C hardness, and REACH screening under EC 1907/2006 with Annex XVII entry 51 phthalate limits if external plasticizers are introduced; ZDHC MRSL v3.1 applies where solvent-borne adhesives are introduced in downstream lamination. Finished article types are die-cut EVA midsoles, flip-flop sole blanks, and sandal strap anchor bases.
Injection-foamed footwear made from UE3302 differs from slabstock because the blowing reaction and peroxide crosslinking must occur inside a clamped cavity rather than an open multi-daylight press; this makes cavity fill ratio the controlling variable. A production formulation for slides and clogs uses 100 phr UE3302, 1.5–2.8 phr azodicarbonamide, 0.8–1.2 phr dicumyl peroxide, 1.0–2.0 phr zinc oxide, 1.0–1.8 phr zinc stearate, and optionally 5–10 phr calcium carbonate to raise melt strength. Zinc oxide and zinc stearate lower azodicarbonamide decomposition onset to 165–175°C; dicumyl peroxide has a half-life close to 1 min at 171°C, so cavity filling must be completed before premature crosslinking freezes cell growth. The reciprocating-screw injection unit is run with barrel zones at 80–100°C, nozzle at 105–115°C, and mold temperature at 170–185°C; clamp force on production machines for EVA clog molding generally falls in the 250–450 t range. The initial shot is normally set to occupy 65–75% of final cavity volume. Below 60% fill, cell structure becomes open-celled and tear strength declines; above 78% initial fill, venting failure and decompression out-gassing generate surface silver streaks and dimensional variation. Cure time scales with wall thickness from 6 min to 12 min. Compliance testing for finished injection-molded articles includes ASTM D2240-15 Shore C, DIN 53512 rebound resilience, ISO 4651:1988 dynamic cushioning, and SATRA TM144 friction. Terminal product types are injection-molded slides, comfort clogs, and quick-recovery sandals.
| Conversion route | UE3302 loading (phr) | Azodicarbonamide (phr) | Dicumyl peroxide (phr) | Target density (g/cm³) | Primary reference method |
|---|---|---|---|---|---|
| Compression slabstock | 100 | 2.4–3.8 | 0.55–0.75 | 0.14–0.26 | ASTM D3574-17 |
| Injection foam | 100 | 1.5–2.8 | 0.8–1.2 | 0.18–0.32 | ASTM D2240-15 |
| Calendered rollstock | 100 | 2.0–3.5 | 0.5–0.7 | 0.08–0.15 | ASTM D3574-17 |
| Skived block foam | 100 | 3.0–4.0 | 0.6–0.8 | 0.12–0.20 | ASTM D3574-17 |
| Water-contact foam | 100 | 2.2–3.0 | 0.7–0.9 | 0.15–0.25 | ISO 17707:2005 |
| Thermoformed footbed | 100 | 2.0–2.8 | 0.5–0.7 | 0.10–0.18 | ASTM D395-18 |
When UE3302 is converted by calendering into rollstock for sports mats and protective padding, the formulation is shifted toward lower peroxide loading to preserve thermoformability after crosslinking: 100 phr UE3302, 10–25 phr polyolefin elastomer, 2.0–3.5 phr azodicarbonamide, 0.5–0.7 phr dicumyl peroxide, 0.8–1.2 phr zinc oxide, 0.5–1.0 phr stearic acid, and 5–15 phr calcium carbonate. The calender line is operated with roll temperatures of 90–105°C; the main production bottleneck is nip-gap drift below 2.0 mm, where a ±0.15 mm variation across a 1.6 m working width can change roll length and density. After calendering, the sheet is expanded and crosslinked in a hot-air tunnel at 175–190°C for 5–8 min. Compliance for mats and padding supplied to the EU includes 2011/65/EU RoHS Annex II and REACH EC 1907/2006; performance testing uses ASTM D3574-17 compression set and EN 14904:2006 for indoor sport surfaces where applicable. Terminal product types are yoga mats, anti-fatigue floor tiles, exercise mat rolls, and child play mat underlay.
Skived insole and orthotic core stock from UE3302 block foam is produced in closed block molds at target densities of 0.12–0.20 g/cm³; the formulation uses 100 phr UE3302, 3.0–4.0 phr azodicarbonamide, 0.6–0.8 phr dicumyl peroxide, 1.2–2.0 phr zinc oxide, 2.0–4.0 phr zinc stearate, 0.5–1.5 phr stearic acid, and 0–5 phr calcium carbonate. In block molds exceeding 100 mm thickness, skin-to-core density gradients and skin thickness variation of 1.0–1.5 mm are common; these blocks are skived to 1.5–3.0 mm sheet before die-cutting. The production limit is post-demold shrinkage: blocks are stabilized at 23±2°C and 50±5% RH for 24–48 h before skiving to avoid curl. When sold as general-use insoles, the sheet is tested to ASTM D3574-17 and screened under REACH EC 1907/2006 Annex XVII; if the same sheet is used in orthotic devices, cytotoxicity and sensitization testing under ISO 10993-5:2009 and ISO 10993-10:2010 may be required depending on the jurisdiction. Terminal article types are die-cut insoles, heel cushions, arch pads, and orthotic core sheets.
For aqua socks, deck sandals, and water shoes, UE3302 is co-blended with 15–25 phr polyolefin elastomer having an octene content between 30% and 45% to reduce Shore C hardness to 30–40 and extend flexural endurance in wet conditions. The blowing and crosslinking package is adjusted to 2.2–3.0 phr azodicarbonamide, 0.7–0.9 phr dicumyl peroxide, 1.0–1.5 phr zinc oxide, and 0.8–1.2 phr zinc stearate. Injection barrel temperatures are held at 75–95°C because the high VA content and POE viscosity can otherwise generate shear heating above 110°C and initiate premature peroxide decomposition. The expansion ratio is the critical threshold: 1.5–1.8 is standard; above 1.9, the cell walls become discontinuous and water absorption can exceed 1.5% by weight after 7-day immersion at 23°C. Compliance for water-contact footwear includes ISO 17707:2005 flex resistance of outsoles, SATRA TM60 water absorption, and RoHS 2011/65/EU; REACH EC 1907/2006 Annex XVII applies to PAH content in the finished article. Terminal product types are water shoes, aqua socks, and deck sandals.
Thermoformed footbed top layers and heel counters made from crosslinked UE3302 sheet rely on post-foaming heat shaping rather than direct mold foaming. The initial crosslinked sheet uses 100 phr UE3302, 2.0–2.8 phr azodicarbonamide, 0.5–0.7 phr dicumyl peroxide, 0.8–1.5 phr zinc oxide, 0.6–1.0 phr zinc stearate, and 2–5 phr color masterbatch; the sheet is then vacuum-formed at 120–140°C at thicknesses of 2–5 mm. The processing boundary is residual stress: parts formed with sharp heel-curvature radii below 8 mm can crack at the outer radius if the sheet is not preheated uniformly. Performance verification includes ASTM D3574-17 tear resistance, ASTM D395-18 compression set, and DIN 53512 rebound resilience. Terminal product types are footbed top layers, sockliners, and heel counters for casual footwear.
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EVATHENE UE3302 is an ethylene-vinyl acetate copolymer resin positioned in the foam and footwear grade segment; the grade designation encodes a nominal vinyl acetate content of 33 wt%. On a molar basis, that comonomer loading corresponds to approximately 13.8 mol% vinyl acetate, calculated from the 86 g/mol vinyl acetate repeat unit and the 28 g/mol ethylene repeat unit. The polymer is supplied as pellets and is characterized by density, melt flow rate, and vinyl acetate content. Density is class-typical for EVA copolymers of this composition, near 0.95 g/cm³ when tested under ASTM D792-20. Melt flow rate is determined under ASTM D1238-20 at 190°C/2.16 kg; foam and footwear grades are generally selected from the low-melt-flow portion of the series because melt strength during gas expansion is process-critical. Exact lot-specific melt flow rate, tensile properties, and hardness are supplier-controlled and should be obtained from the certificate of analysis; published data for this specific configuration is limited. The resin differs from general-purpose EVA grades by the combination of 33 wt% vinyl acetate and a rheological package intended for chemical blowing-agent expansion, rather than for thin-gauge film or high-speed injection molding. The product is used in chemically crosslinked foam sheets, compression-molded midsoles, and injection-molded footwear components where cell uniformity, Shore hardness reduction, and low-temperature flexibility are specified.
Vinyl acetate content directly controls crystallinity, melting behavior, hardness, and polar interaction in EVA copolymers. Representative differential scanning calorimetry data reported for EVA copolymers show a crystalline melting endotherm near 86°C at 18 wt% vinyl acetate, falling to approximately 62°C at 33 wt% and near 50°C at 40 wt% when tested under ASTM D3418-21. The corresponding reduction in crystalline fraction lowers Shore hardness from roughly 90–95 Shore A for 18 wt% VA grades to 65–75 Shore A for 33 wt% VA grades when measured on compression-molded plaques under ASTM D2240-15. Consequently, EVATHENE UE3302 provides a softer, more rubber-like response than low-VA extrusion-coating or general-purpose grades at equivalent melt flow rate.
Low-temperature flexibility is also improved because vinyl acetate units disrupt polyethylene crystallinity and reduce the low-temperature modulus plateau. Brittleness temperature testing under ASTM D746-20 commonly places 33 wt% VA EVA compounds at or below -40°C, whereas lower-VA grades may become brittle nearer -20°C, though exact values depend on plasticizer and filler loading. The polar acetate group increases surface energy and adhesion to polyurethane, polyester fabric, and polyether blockamide substrates. Adhesion is frequently evaluated by 180° peel testing under ASTM D903-98; higher VA content reduces the need for corona treatment or solvent primers relative to 18 wt% VA grades. At 40 wt% VA, surface tack and pellet blocking become more pronounced, while melt strength declines and gas retention during expansion becomes less stable. EVATHENE UE3302 occupies an intermediate position where polar adhesion and expansion stability overlap.
In crosslinked EVA foam production, EVATHENE UE3302 is first fluxed in an internal mixer or low-shear compounding extruder. The polymer is mixed at 105–115°C before filler addition; calcium carbonate is commonly added at 10–25 phr to reduce cost and improve cell nucleation. The blowing agent and peroxide crosslinking agent are added below 110°C to avoid premature decomposition. Azodicarbonamide decomposes near 200–210°C, with a published gas yield near 220 mL/g, while dicumyl peroxide undergoes thermally triggered decomposition at higher temperatures, allowing the compound to be shaped before crosslinking. The sheeted compound is passed through a two-roll mill at 90–100°C and then transferred to a hydraulic press or continuous foaming oven. Cell-size control is evaluated by sectioning the foam and measuring cell diameter by optical microscopy; no accepted ASTM method exists for visual cell-size rating, so internal pass/fail criteria are used.
Batch-to-batch variation in melt flow rate is the primary rheological variable observed on production lines; small shifts can alter die pressure and cell growth unless the formulation is adjusted. Quantitative correlations between UE3302 lot melt flow rate and foam density are not fully published; processors routinely cross-check incoming melt flow rate against internal reference lots before changing setpoints. Unlike hygroscopic polymers such as polyamide, EVA does not require aggressive drying. Surface moisture from condensation at relative humidity above 60% is the main source of water-related surface defects.
For continuous sheet foam, EVATHENE UE3302 is processed on single-screw extruders with L/D 25:1 to 30:1 and a barrier screw configuration. Temperature profiles from feed to metering are typically held at 130–170°C, with the die maintained near 180°C to balance melt strength against premature blowing-agent decomposition. The melt temperature must remain below 210°C because vinyl acetate groups begin significant deacetylation near 230°C, releasing acetic acid and forming gel specks. A processing excursion of 5°C or more above the established upper limit can produce visible yellowing and equipment corrosion.
At equivalent melt flow rate, the 33 wt% VA grade exhibits lower zero-shear viscosity than 18 wt% VA material because reduced crystallinity weakens the physical network in the melt. This lowers specific energy input during mixing but narrows the operating window for gas retention. Die pressure is monitored as a real-time indicator of viscosity; a die pressure drop of more than 10% across a run typically signals feed or temperature drift. Foam density in continuous sheet is controlled by die gap, haul-off speed, and blowing-agent loading. Typical die gaps for EVA foam sheet range from 0.5 mm to 1.5 mm, but published data for UE3302-specific tooling is limited.
Compression-molded midsole production uses hydraulic presses with 150–300 tonnes clamp force and multi-cavity molds. The compound is cut into preforms and loaded at 90–100°C, then cured and expanded at 170–190°C under pressure. Mold venting is critical; trapped gas from azodicarbonamide can cause split lines in thick sections. Wall sections above 20 mm may require dual-step curing to avoid core blowout. Injection molding of 33 wt% VA EVA footwear shells uses melt temperatures of 180–190°C and mold temperatures of 20–40°C. Because of low crystallinity, cooling time is longer than for lower VA grades, and ejection can be more sensitive to surface tack.
Replacement of an 18 wt% VA grade with EVATHENE UE3302 in a sole compound lowers hardness and increases elongation but also reduces thermal resistance and may increase compression set unless crosslink density is adjusted. The following table compares representative copolymer-class properties measured on compression-molded plaques, not guaranteed lot values for any specific EVATHENE grade.
| Property | 18 wt% VA EVA | 33 wt% VA EVA | 40 wt% VA EVA | Test method |
|---|---|---|---|---|
| Nominal vinyl acetate content | 18 wt% | 33 wt% | 40 wt% | ASTM D5594-18 |
| DSC melting endotherm | 86°C | 62°C | 50°C | ASTM D3418-21 |
| Shore A hardness | 90–95 | 65–75 | 45–55 | ASTM D2240-15 |
| Tensile strength at break | 18–22 MPa | 10–15 MPa | 5–10 MPa | ASTM D638-14 |
| Elongation at break | 600–800% | 800–1000% | 1000–1200% | ASTM D638-14 |
| Density | 0.94 g/cm³ | 0.95 g/cm³ | 0.96 g/cm³ | ASTM D792-20 |
Because UE3302 is supplied as a foam and footwear grade, formulations that replace 18 wt% VA grades may require a higher peroxide loading to maintain compression set resistance. Compression set is measured under ASTM D395-18 at 23°C or 70°C. As vinyl acetate content increases, the unvulcanized polymer is softer and the crosslink network must carry a larger share of the recovery force. A direct substitution based only on melt flow rate is therefore inadequate; the higher vinyl acetate content also lowers the melting point, so extruder and mold temperatures may be reduced by 5–10°C to avoid premature blowing-agent decomposition and surface stickiness.
Surface moisture rather than internal moisture governs hopper handling of EVATHENE UE3302. When warehouse relative humidity exceeds 60%, pellet surface condensation can produce voids or surface defects in molded parts; a desiccant or hot-air hopper dryer set at 70°C for 2–3 h is sufficient. The resin should not be exposed to strong oxidizing acids or strong bases because hydrolysis of the acetate group releases acetic acid. Processing equipment should be constructed with corrosion-resistant venting hardware because deacetylation products at elevated temperatures are acidic. For regulatory documentation, neat resin information is typically aligned with EU REACH Regulation (EC) No 1907/2006 and EU RoHS Directive 2011/65/EU; the presence of substances of very high concern must be confirmed with the supplier safety data sheet. Food-contact use is not implied by the foam and footwear grade designation. If an EVA copolymer is considered for food-contact articles, compliance with 21 CFR 177.1350 must be evaluated for the specific formulation, including blowing-agent residues and crosslinking byproducts.
