| HS Code | 936139 |
| Va Content | ≥33% |
| Density | 0.95-0.97 g/cm³ |
| Melt Flow Rate | 5-20 g/10min |
| Melting Point | 60-70 °C |
| Vicat Softening Temperature | 40-50 °C |
| Shore Hardness | 70-80 Shore A |
| Tensile Strength | 15-25 MPa |
| Elongation At Break | 800-1000% |
| Flexural Modulus | 20-40 MPa |
| Brittleness Temperature | -70 °C or lower |
| Glass Transition Temperature | -40 to -30 °C |
| Thermal Decomposition Temperature | >250 °C |
As an accredited EVAFLEX High VA Series EVA Copolymer Resin,≥33% VA,Flexible Grade factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg heat-sealed polyethylene-lined bags, ensuring moisture protection and safe handling. |
| Container Loading (20′ FCL) | 20′ FCL loads about 20–25 tons of EVAFLEX High VA EVA resin in bags, wrapped on pallets, kept dry and ventilated. |
| Shipping | The EVAFLEX High VA Series resin ships as solid pellets in moisture-resistant bags or bulk packaging. Keep dry, avoid prolonged heat exposure, and store away from oxidizers. Non-hazardous under normal transport, it requires standard handling, clean ventilation, and safeguarding against compaction or deformation during transit. |
| Storage | Store EVAFLEX High VA Series EVA Copolymer Resin 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 high humidity and extreme temperature fluctuations. Maintain stable conditions and rotate stock to ensure optimal performance. |
| Shelf Life | Store in a cool, dry, shaded area. Stable for at least one year under proper storage conditions. |
Hot-melt adhesive compounding with EVAFLEX High VA Series is conducted on heated sigma-blade kneaders or co-rotating twin-screw extruders where the resin is blended with tackifier resins and paraffin or Fischer-Tropsch waxes at melt temperatures held between 150°C and 175°C. The vinyl acetate content of ≥33% by mass reduces seal initiation temperature on polar substrates and permits wetting of corona-treated polyester and coated paperboard at application temperatures 10–20°C lower than EVA grades with 18–28% VA. In packaging and bookbinding formulations, the copolymer is added at 25–45 wt% of total adhesive mass, with the balance comprising 30–50 wt% hydrogenated rosin ester or C5/C9 tackifier, 5–20 wt% wax diluent, and 0.5–1.5 wt% hindered phenolic antioxidant. Where the selected grade exhibits a melt mass-flow rate in the 10–40 g/10 min band under ISO 1133-1:2022 conditions at 190°C/2.16 kg, it is specified for high-speed carton sealing because it balances low melt viscosity against a sufficient plateau modulus after quenching. Processors run twin-screw compounding lines with L/D ≥ 40, a vacuum port at −0.06 MPa to strip residual moisture, and strand die face cutting; batch kneaders are operated at rotor speeds of 35–60 rpm until torque stabilizes. Adhesives intended for indirect food contact are evaluated under FDA 21 CFR 175.105, while films and coatings in direct contact with food fall under FDA 21 CFR 177.1350 and EU Regulation 10/2011. Terminal products include side-seam and closure adhesives for corrugated board, book spine glues, woodworking edge-banding adhesives, and assembly adhesives for hygiene articles. Published data for the specific flash point and viscosity of every lot should be obtained from certificates of analysis rather than assumed from nominal VA content alone.
When the copolymer is blended into suspension-grade PVC dry blends, the polar vinyl acetate sequences in EVAFLEX High VA Series perform two functions simultaneously: they plasticize amorphous PVC domains and they form a dispersed elastomer phase that stops crack propagation under notched impact. Addition rates are set between 8 phr and 20 phr for semi-rigid extrudates, while unplasticized PVC window profiles typically consume 5–12 phr as an impact modifier. The dry blend is prepared in a high-speed hot mixer at 100–120°C, dropped into a cooling mixer, and then processed on a counter-rotating twin-screw extruder with L/D 24–36, barrel temperatures from 160°C to 180°C, and vacuum degassing at −0.08 MPa. The resulting compound is evaluated according to EN 12608-1:2016 for window profiles, ISO 179-1/1eA for notched Charpy impact, and ASTM D638-14 for tensile yield and elongation at break. At the upper end of the dosage range, the modified compound can raise notched Charpy impact from a baseline below 5 kJ/m² to above 10 kJ/m²; however, the same addition level reduces Vicat softening temperature by 3–8 K and is not recommended for profiles that must carry structural loads above 60°C. During extrusion, the melt should not be held above 190°C for more than 10 min because the acetate comonomer can liberate acetic acid under extended shear. Terminal product types include window and door profile sections, cable trunking, furniture edge bands, and automotive interior decorative profiles.
When high-VA ethylene-vinyl acetate is dispersed into penetration-grade bitumen, the vinyl acetate sequences raise the polarity of the polymer phase and reduce the tendency of EVA particles to coalesce under hot storage, which is a known failure mode for low-VA EVA-modified bitumen. In road paving, the resin is added at 3–6 wt% of neat bitumen and mixed through a rotor-stator high-shear mill at 3,000–5,000 rpm and 170–190°C for 1–2 h; the resulting polymer-modified bitumen is then held in stirred tanks at 160°C. In waterproofing membrane compounds, loadings of 8–15 phr are used to obtain a high softening point and increased melt stiffness. Compliance for European road binders follows EN 14023:2010, with viscosity measured under EN 13302 at 135°C, storage stability under EN 13399, softening point under ASTM D6084/D6084M-18, and penetration under ASTM D5/D5M-19; in North America, performance grading is reported under AASHTO M320. The formulation does not require the sulfur-vulcanization step used with SBS because the thermoplastic EVA phase re-forms on cooling, but the elastic recovery of EVA-modified bitumen remains lower than that of SBS networks, so it is selected for rutting resistance and processability rather than for extreme cyclic deformation. Terminal products include heavy-duty highway surface course binders, airport apron paving, bridge deck asphalt, and torch-applied or self-adhesive roofing membranes.
In halogen-free flame-retardant cable jackets, EVAFLEX High VA Series is selected as the continuous polymer phase because its ≥33% vinyl acetate content improves interaction with aluminium trihydroxide and magnesium dihydroxide surfaces, allowing filler loadings of 55–65 wt% without the gross tensile brittleness observed with LLDPE or low-VA EVA matrices. The base polymer is charged at 25–45 wt%, with the flame-retardant filler, 3–5 wt% of organosilane coupling agent, and 1–2 wt% of processing stabilizer. Compounding is performed in an internal mixer at 140–160°C and 40–60 rpm, followed by pelletizing; the cable jacket is then extruded on a single-screw extruder with L/D 24–30 and a barrel profile from 130°C to 170°C. Flame performance is assessed according to IEC 60332-1-2 for vertical flame spread, acid gas evolution under IEC 60754-1, and oxygen index under ISO 4589-2:2017; formulations with ATH at 60 wt% typically record oxygen indices in the 28–35% range. The operational boundary is the endothermic decomposition of ATH near 200–220°C, which requires maintaining melt temperatures below 180°C to avoid pre-foaming, surface roughness, and screw torque instability during cable extrusion. Terminal products include low-voltage building cable sheathing, control cable jackets, solar DC cable jackets, and halogen-free tray cable sheathing.
Cast coextrusion of polyolefin-based lidding films introduces a high-VA EVAFLEX grade as the sealant layer because the vinyl acetate comonomer depresses heat-seal initiation temperature and broadens the hot-tack plateau on filled polypropylene and polyethylene trays. The sealant layer is run at 10–30 µm thickness and is typically formulated as 70–90 wt% high-VA EVA with 10–30 wt% mLLDPE or LDPE to control blocking and reduce extractables. Food-contact packaging made from this layer falls under EU Regulation 10/2011 and FDA 21 CFR 177.1350, while seal strength is measured according to ASTM F88/F88M-21 and hot-tack performance under ASTM F1921-18. On a three- or five-layer cast line, the sealant extruder is operated between 170°C and 230°C, the chill roll is held at 15–25°C, and the film surface is corona-treated to 38–42 mN/m before printing or lamination. Because the high VA content increases blocking force, processors add a silica-based antiblock masterbatch at 3,000–5,000 ppm and store finished reels below 30°C to prevent interlayer sticking. Terminal products include lidding films for chilled dairy cups, medical device pouches, snack flow-pack films, and peelable lids for polypropylene containers. The grade is not recommended for retort or steam-sterilization applications above 121°C because the sealant layer can undergo creep failure under internal pressure.
Low-hardness crosslinked foam prepared from EVAFLEX High VA Series is compounded on a two-roll mill with front roll temperature set to 90–100°C and back roll to 100–110°C, then sheeted and compression molded at 150–170°C under 10–15 MPa for 10–20 min. The formulation is built on 100 parts by mass of high-VA EVA, with 0.6–1.2 phr dicumyl peroxide as the crosslinking agent, 3–5 phr azodicarbonamide as the blowing agent, 1.5–3.0 phr zinc oxide as an activator, and 1–2 phr zinc stearate as a release and dispersion aid. The high vinyl acetate content reduces crystallinity and yields foam density between 0.15 g/cm³ and 0.25 g/cm³ with Asker C hardness of 25–40; these values are measured under ASTM D3575-20 and tensile properties under ISO 1798:2008. Dosing of dicumyl peroxide above 1.2 phr increases crosslink density but narrows the expansion window and has been associated with skin cracking on production presses when gas release outpaces melt strength development. REACH Annex XVII restrictions and residual blowing agent limits under specific brand specifications must be checked for skin-contact and children’s articles. Terminal product types include shoe midsoles and sockliners, protective padding in sports equipment, anti-fatigue matting, and low-density yoga blocks.
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EVAFLEX High VA Series EVA Copolymer Resin is a random ethylene-vinyl acetate copolymer with a vinyl acetate comonomer concentration controlled at ≥33% by weight and classified as a flexible grade. The resin is supplied in pellet form for thermoplastic compounding, hot-melt adhesive manufacturing, sealant formulation, and polymer modification. Representative grade designations in the high-vinyl acetate range include EV150, EV40LX, EV45LX, and EV45A. The series spans melt flow rates from approximately 2 g/10 min to 30 g/10 min when measured at 190°C under 2.16 kg load in accordance with ASTM D1238 and ISO 1133-1. Density is conventionally reported in the 0.96–0.98 g/cm³ range per ISO 1183-1, and Shore A hardness values remain below 90 per ISO 868. The elevated vinyl acetate content reduces crystallinity, lowers the crystalline melting range relative to ≤18% VA grades, and increases polarity, filler acceptance, and adhesion to polar substrates. Table 1 provides an engineering envelope of typical properties for the series.
| Property | Typical Range | Test Method |
|---|---|---|
| Vinyl acetate content | 33–46 wt% | Internal polymer analysis |
| Melt flow rate | 2–30 g/10 min | ISO 1133-1 / ASTM D1238, 190°C/2.16 kg |
| Density | 0.96–0.98 g/cm³ | ISO 1183-1 |
| Shore A hardness | 70–90 | ISO 868 |
| Tensile strength at break | 4–15 MPa | ISO 527-2 |
| Elongation at break | 600–1000% | ISO 527-2 |
| Flexural modulus | 5–50 MPa | ISO 178 |
| Vicat softening temperature | <50°C | ISO 306 |
The tabulated values are representative of the high-VA series and are not a lot-specific specification. Grade-specific data sheets and certificates of analysis should be consulted for melt flow tolerance, vinyl acetate content, and additive package details. Published data for unusually high filler loadings in this specific polymer configuration remain limited.
High-VA EVA resins require lower melt temperatures than low-VA EVA or linear low-density polyethylene because the acetoxy side groups begin to eliminate acetic acid at elevated thermal stress. Degradation is generally negligible below 160°C, but becomes measurable above 180°C and accelerates with residence time above 200°C. The release of acetic acid reduces melt viscosity, shifts color, and can corrode unlined steel surfaces. In production-scale twin-screw compounding, barrel profiles are typically set from 120°C at the feed throat to 170–190°C at the die, with melt temperature monitored by infrared pyrometer and held below 190°C. Screw configurations favor low-shear mixing elements, compression ratios of 2.0:1 to 2.5:1, and L/D ratios from 24:1 to 30:1. Heavy kneading blocks are reduced or repositioned to avoid localized viscous heating, and vacuum venting is applied to strip residual moisture and acetic acid.
Moisture control is a practical processing boundary. Residual moisture in high-VA EVA can hydrolyze ester groups during melting and increase acid evolution. If sacks have been exposed to ambient relative humidity above 60% or stored in unheated warehouses, desiccant drying at 60–70°C for 4–6 h to a bulk moisture target below 0.05% is standard before extrusion or injection molding. Production lines that run continuous campaigns with high-VA EVA typically specify corrosion-resistant screw and barrel coatings; nitrided barrels may show pitting after long exposure to acetic acid. For injection molding, moderate clamp force is sufficient because the resin flows at low pressure, but shot size and cushion should be adjusted to account for melt compressibility. Cushion position is frequently maintained at 3–5 mm to reduce degradation from long hold times in the barrel. Additives that are strongly alkaline or amine-based should be avoided because amine-catalyzed ester hydrolysis can lower melt stability and produce surface tack.
Hot-melt adhesive compounding uses the low-melt-flow grades such as EV40LX and EV45LX as polymer bases at 20–40 wt% with tackifier resins and waxes. The low melt flow grades contribute cohesive strength and creep resistance, while the higher melt flow grades EV150 and EV45A reduce formulation viscosity and permit lower application temperatures in slot-die, spiral-spray, and porous-substrate wetting systems. Softening point, open time, and low-temperature adhesion are tuned by tackifier selection; rosin ester and hydrogenated hydrocarbon resins show good compatibility with the polar acetate groups. Melt viscosity at 180°C for formulated high-VA EVA adhesives is routinely measured by ASTM D3236 with a Brookfield Thermosel; values depend on melt flow rate, tackifier type, and wax loading. Viscosity stability over a 24 h aging period at application temperature is used as a process control indicator for adhesive degradation.
Flexible compounds and sealants use high-VA EVA as a soft polar modifier for polyolefins or as the base polymer for peroxide-crosslinked foams. In crosslinked foam applications, dicumyl peroxide is used at 0.5–1.0 phr with coagents such as triallyl isocyanurate; crosslinking is followed through torque rheometry or solvent swell. The high vinyl acetate content lowers the crystalline plateau, increases elongation, and improves flexural fatigue resistance, but continuous service under load is limited by creep and compression set. In polymer modification, high-VA EVA is used to raise filler acceptance and improve compatibility with polar fillers such as aluminum trihydrate or calcium carbonate. Typical addition levels in modified compounds range from 10–30 wt%, depending on the required hardness reduction and filler loading.
Food-contact adhesive and packaging applications require verification of the specific grade against 21 CFR 175.105 or Commission Regulation (EU) 10/2011. Compliance is grade-specific and cannot be assumed for the entire high-VA series. Electrical and electronic encapsulant applications should be assessed against REACH and RoHS substance restrictions, particularly where stabilizer packages or slip additives are present. The high-VA EVA resins are thermoplastic and are not self-crosslinking at normal processing temperatures; creep-resistant or compression-set-resistant end uses require intentional peroxide crosslinking or selection of a vulcanized elastomer.
Compared with EVA grades containing ≤18% vinyl acetate, the high-VA series displays lower flexural modulus, lower Shore hardness, higher elongation, and greater adhesion to polar surfaces. These differences are measurable under ISO 178 for flexural modulus and ISO 527-2 for tensile elongation. The trade-off is lower tensile strength, lower service temperature ceiling, higher moisture uptake, and narrower melt-processing window. Conventional low-VA EVA retains more crystalline ethylene segments and therefore provides higher stiffness and better load-bearing capacity; high-VA EVA shifts the property profile toward elastomeric behavior without requiring vulcanization.
Compared with metallocene polyolefin elastomers, high-VA EVA provides higher polarity and better polar-substrate adhesion, which is particularly relevant in adhesive, sealant, and filled-compound applications. However, polyolefin elastomers generally exhibit better thermal stability, lower moisture absorption, and more stable long-term aging. When selecting between high-VA EVA and a polyolefin elastomer, the decision should be based on peel adhesion data, migration resistance, and thermal aging performance. Peel adhesion on polar substrates is evaluated by ASTM D903 or ISO 11339, while compression set after 22 h at 70°C is evaluated by ASTM D395. High-VA EVA tends to show higher residual deformation than vulcanized EPDM, and continuous load applications should use creep testing under the intended service temperature and stress.
Compared with EMA and EBA copolymers, high-VA EVA offers a sharper melt viscosity response and higher acetate polarity, but may have inferior thermal stability at elevated processing temperatures. Equipment selection should therefore favor lower shear and shorter residence time. Grade substitution without reformulation is not recommended; changes in VA content and melt flow rate affect tackifier compatibility, filler wetting, adhesive open time, and low-temperature flexibility. Trial runs should include melt viscosity curves by ASTM D3236 at three temperatures, peel adhesion after 7-day aging at 50°C, and visual inspection for gel or color development.
The high-VA EVAFLEX series is therefore positioned for applications where flexibility, polar adhesion, and thermoplastic processability are required, while low-VA EVA, POE, EPDM, or EMA remain more appropriate where thermal stability, low moisture uptake, or vulcanizate-level compression set governs the specification.
