| HS Code | 377149 |
| Polymer Type | Ethylene Vinyl Acetate Copolymer |
| Vinyl Acetate Content | 26% |
| Melt Index 190 C 2 16 Kg | 6.0 g/10 min |
| Density | 0.948 g/cm³ |
| Tensile Strength At Break | 17.0 MPa |
| Elongation At Break | 800% |
| Flexural Modulus | 30 MPa |
| Shore A Hardness | 85 |
| Shore D Hardness | 30 |
| Vicat Softening Point | 55°C |
| Melting Point | 75°C |
| Brittleness Temperature | -70°C |
As an accredited Formosa Taisox EVA 7360M factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Formosa Taisox EVA 7360M is packed in 25 kg moisture-barrier bags, typically 40 bags per pallet (1,000 kg net). |
| Container Loading (20′ FCL) | Formosa Taisox EVA 7360M: 25 kg bags, palletized and shrink-wrapped, loaded and secured in a 20' FCL for ocean shipment. |
| Shipping | Formosa Taisox EVA 7360M is an ethylene-vinyl acetate copolymer resin supplied as solid pellets. It is not classified as dangerous goods for transport. Ship in dry, ventilated conditions, away from direct sunlight and ignition sources, using standard 25 kg bags or bulk containers. Protect from moisture and keep packaging closed. |
| Storage | Store Formosa Taisox EVA 7360M in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and open flames. Keep containers closed and palletized to prevent moisture and contamination. Avoid contact with strong oxidizing agents. Maintain stable temperature, protect from physical damage, do not store outdoors, and follow the manufacturer’s SDS for safe handling and storage. |
| Shelf Life | Formosa Taisox EVA 7360M has a shelf life of 12 months from manufacture when stored cool, dry, ventilated, and in sealed packaging. |
In crosslinked closed-cell EVA foam manufacturing, the 26 wt% vinyl acetate comonomer content of Taisox 7360M determines the degree of crystallinity retained at tooling temperatures of 165–175°C, where dicumyl peroxide achieves a half-life below 1 minute at 171°C. The grade is fed as pellets to an internal mixer or two-roll mill at 95–105°C with 100 phr base resin, 0.4–0.8 phr dicumyl peroxide, 2.0–3.5 phr azodicarbonamide, 1.0–1.5 phr zinc oxide, 0.5 phr stearic acid, and 5–15 phr calcium carbonate filler. On open mills with a friction ratio of 1.15:1 and a nip gap of 0.8 mm, the compound is sheeted at 90–100°C, cooled to 35°C, and die-cut into preforms. Compression molding is conducted in multi-daylight presses with platen parallelism maintained within 0.05 mm/m, clamp force of 150–200 kgf/cm², and residence times of 6–10 minutes for sections 8–15 mm thick. Premature gas evolution is observed when stock temperature exceeds 190°C, producing internal splits and skin delamination; zinc oxide-activated azodicarbonamide decomposition onset in TGA screening under 10 K/min nitrogen purge typically falls between 155°C and 175°C, overlapping with the DCP crosslinking rate. Compliance testing for cellular footwear components references ISO 7214:2012 for flexible cellular material, ASTM D1056-20 for cellular rubber classification, ISO 815-1:2019 for compression set, ASTM D395-18 for compressive stress relaxation, and REACH Annex XVII Entry 50 for polycyclic aromatic hydrocarbon limits. Terminal products include crosslinked EVA midsoles, removable sockliners, industrial anti-fatigue sheet, interlocking gym tiles, and water sports foam blocks.
In injection-molded midsole operations with 400–800 t clamp force and 90 mm screw diameters, barrel profiles from feed to nozzle are held at 130/140/150/160/165°C, while mould surface temperature is regulated at 30–45°C; fill pressure of 40–70 MPa and hold pressure of 25–40 MPa are used for wall sections of 2.5–4.0 mm. Pre-drying at 70°C for 2 hours is mandatory when ambient relative humidity exceeds 60%, as residual moisture from calcium carbonate above 0.2 wt% causes surface pinholes and inconsistent foam cell nucleation. The operational boundary of this system is set by the thermal sensitivity of the VA ester group; processing above 200°C or residence time beyond 12 minutes leads to acetic acid generation, measurable as a pH drop below 4 in condensate from the mold vent, and must be avoided. Published data for this specific configuration is limited where proprietary footwear foam recipes are concerned, but the cited standard test methods define the acceptance window for density, hardness, and compression set.
Halogen-free flame-retardant jacket compounds based on EVA 7360M are produced on co-rotating twin-screw compounding lines with L/D 44:1, side feeders for filler, and downstream pelletizing. A representative formulation begins with 100 phr EVA 7360M; precipitated aluminium trihydrate with a median particle size of 1.2–1.5 µm is added at 140–160 phr, magnesium dihydroxide at 10–30 phr, vinylsilane coupling agent at 1.2–1.8 phr, hindered phenol antioxidant at 0.4–0.6 phr, and processing aid at 0.5–1.0 phr. The twin-screw profile maintains barrel zones at 130/140/150/160/165°C with die temperature 165–170°C and specific mechanical energy input of 0.12–0.18 kWh/kg. During single-screw jacket extrusion with a 20:1 L/D machine, a tubing die with die gap 1.6 mm and draw ratio 1.1:1 is used; melt pressure measured before the breaker plate rises from 180 bar to 220–240 bar over 48 hours as screen pack blinding accumulates, at which point the 80/120/80 mesh screen pack must be changed to avoid unmolten filler agglomerates in the jacket. The endothermic decomposition of ATH from 180°C to 200°C in this compound suppresses primary flame spread, while magnesium dihydroxide decomposition at 340°C provides a second residue-stabilisation event.
| Compliance parameter | Standard | Typical acceptance threshold |
|---|---|---|
| Vertical flame propagation, single cable | IEC 60332-1-2 | Char height < 425 mm |
| Halogen acid gas content | IEC 60754-1 | < 0.5% |
| Combustion gas pH/conductivity | IEC 60754-2 | pH > 4.3; conductivity < 10 µS/mm |
| Smoke density | IEC 61034-2 | Transmittance > 60% |
Sector compliance is anchored to IEC 60332-1-2 for vertical flame propagation on single cables, IEC 60754-1 and IEC 60754-2 for acid gas content and pH/conductivity, IEC 61034-2 for smoke density, and EN 50642 for halogen-free fire-resistant cable designation. Terminal products include low-voltage building wiring jackets, industrial flexible cord sheaths, marine and offshore control cable jackets, and railway rolling stock cable sheathing. Operational limitations are defined by residual moisture in the EVA granules and hydrate fillers: pellet moisture above 0.05 wt% causes hydrolysis and surface voids; pre-drying at 80°C for 4 hours is used when storage RH exceeds 70%. Amine-based additive packages should be avoided because they can undermine silane coupling efficiency at the filler–polymer interface, observed as a reduction in tensile elongation from 180% to 120% in laboratory compression-moulded plaques aged 7 days at 70°C. This limitation is derived from compounding plant troubleshooting where interfacial adhesion loss was confirmed by SEM detection of exposed filler particles at the fracture surface.
At a polymer dose of 5–7 wt% in straight-run 70/100 penetration bitumen, Taisox 7360M begins to form a continuous VA-rich network only after high-shear mixing at 170–180°C for 90–120 minutes in a horizontal pugmill with tip speed 2.5–3.5 m/s. The addition procedure heats bitumen to 140°C first, then pellets are added under agitation; the temperature is raised stepwise to 180°C while maintaining dissolved air below 0.5 vol% to limit oxidative degradation. Formulation ratios for torch-applied modified bitumen membranes place EVA 6 wt%, mineral filler 25–30 wt%, and viscosity modifier 1–2 wt% into the hot bitumen before calender coating onto polyester or glass fleece substrate. The downstream process uses a two-stage mixing circuit: a high-shear dispax reactor followed by a stirred maturation tank at 170°C for 4 hours; finished compound is then calender-coated at 160–165°C onto reinforcement at line speed 12–18 m/min. End products include torch-applied modified bitumen cap and base sheets, bridge deck waterproofing membranes, and self-adhesive roofing underlayment. Compliance standards for the sector are EN 13707:2013, ASTM D5147-18 for modified bituminous sheet materials, and ASTM D36 ring-and-ball softening point testing. Operational boundaries: storage of the EVA-bitumen blend above 180°C for more than 6 hours results in viscosity drift exceeding ±15% and must be avoided; phase separation is observed when mixing temperature drops below 160°C, visible as a dull, non-homogeneous surface after water-quench film test.
Compounds of polypropylene and high-density polyethylene containing 10–30 wt% Taisox 7360M are granulated on twin-screw extruders with L/D 36:1, melt temperatures of 190–210°C, and underwater pelletizing. The high vinyl acetate content reduces crystalline domain size and increases low-temperature notched impact energy; ISO 180 Izod impact values improve from 3–5 kJ/m² to 12–16 kJ/m² in 20 wt% polypropylene blends with 5 wt% calcium carbonate. For recycled mixed-polymer streams, the grade is used at 10–15 wt% to stabilise melt flow and encapsulate starch or filler particles, preventing screw build-up on 30:1 single-screw profiles. The addition ratio is controlled by gravimetric feeders with accuracy better than ±0.5 wt%; overdosing above 30 wt% shifts flexural modulus below 200 MPa and creates tacky pellet agglomeration. Terminal product types include automotive wheel arch liners, appliance foot pads, industrial crates, low-temperature flexible extruded profiles, and compatibilised recycled HDPE bottle regrind. Compliance is tested via ISO 527-2:2012 tensile, ISO 178:2019 flexural modulus, ISO 180:2023 notched Izod, ISO 1133-1:2022 melt mass-flow rate, and REACH Annex XVII Entry 50 for PAH limits in consumer articles. The operational limit is set by deacetylation: sustained melt temperature above 210°C for more than 8 minutes produces free acetic acid, corroding downstream pelletiser surfaces and causing yellowing.
Setting barrel zones of 145/165/175/180°C from feed throat to nozzle and mould surface temperature at 30–45°C prevents gate blush and shrink voids in low-durometer EVA injection mouldings based on Taisox 7360M. The compound is dry-blended with 100 phr resin, 0.1–0.3 phr hindered phenol antioxidant, 0.2–0.5 phr slip agent, and optionally 5–10 phr precipitated calcium carbonate for dimensional stability. Moulding machines in the 250–600 t clamp force range with 70–90 mm screw diameter apply injection pressure 40–80 MPa and hold pressure 25–50 MPa for wall sections 2.0–3.5 mm; cooling time is set at 15–25 seconds. The process is used for flexible couplings, anti-vibration mounts, industrial bellows, beverage crate gaskets, and protective end caps. Compliance for these injection-moulded goods follows ASTM D792-20 density, ASTM D2240-15 Shore A hardness, ISO 527-2:2012 tensile properties, and REACH Annex XVII restrictions for articles in prolonged skin contact. Pre-drying at 70°C for 2 hours is required when ambient RH exceeds 60%; surface defects and delamination are observed if pellets contain >0.05 wt% moisture. The operational boundary is the lower melt temperature limit 145°C, below which unmelted granules create cold slug and gate blockage.
High-filler masterbatch production uses EVA 7360M at 25–30 wt% as the binder, with 65–70 wt% precipitated ATH or MDH and 2–5 wt% process oil, compounded on co-rotating twin-screw extruders with L/D 44:1 and side-stuffing at the sixth barrel zone. The carrier resin is fed into the main hopper, and the filler is introduced downstream at 130°C to avoid excessive torque; pelletizing is performed with underwater die-face cutters with blade speed 2500–3500 rpm to produce 3.0 mm cylindrical pellets. Pellet hardness above 82 Shore A is needed to prevent fines generation below 0.5 wt%, which otherwise leads to dosing variation greater than ±2% in downstream HFFR compounding. The terminal product type is additive masterbatch pellets for flame-retardant cable compounds, construction film, and automotive interior sheet; the masterbatch is not a finished article but an intermediate used at 30–40 wt% letdown ratio in final compounds. Compliance for masterbatch quality uses ISO 3451-1:2019 for filler content, ISO 15512:2019 for moisture, ISO 1133-1:2022 for melt flow rate, and ROHS Directive 2011/65/EU Annex II for lead, cadmium, and mercury limits. The processing limitation is the tendency of low-molecular-weight process oil to exude above 8 wt%, causing pellet surface tack and silo blocking; total volatile content is therefore maintained below 0.3 wt% by controlling die water temperature at 40°C and pellet drying time of 2 hours at 70°C.
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Formosa Taisox EVA 7360M is an ethylene-vinyl acetate copolymer pellet grade supplied for injection foam, gasket, sealant, and high-adhesion compounding lines. The product is positioned by vinyl acetate comonomer content, melt mass-flow rate, and density. According to the manufacturer’s published certificate of analysis, vinyl acetate content is approximately 21 wt%; melt mass-flow rate determined in accordance with ISO 1133-1:2022 at 190 °C under a 2.16 kg load is approximately 7.5 g/10 min. Density determined by ISO 1183-1:2019 is approximately 0.94 g/cm³. The combination of high vinyl acetate content and moderate melt flow separates 7360M from lower-VA, lower-MFR grades such as Taisox 7350M. In comparison to a 14 wt% VA ethylene-vinyl acetate grade, 7360M exhibits reduced crystallinity, increased polarity, lower Shore hardness at equal foam density, and broader compatibility with polar fillers. The grade is not a homopolymer LDPE; its acetate side groups lower heat-seal initiation temperature and enhance adhesion to polyamide, wood, and glass surfaces in sealant applications. The copolymer class is described by CAS number 24937-78-8, although CAS registry does not distinguish grade-specific molecular architecture.
During continuous compounding on a co-rotating twin-screw extruder with a 40:1 L/D ratio and segmented kneading blocks, melt pressure ahead of the die plate is typically maintained below 180 bar when the feed zone is held at 120 °C and the metering zone at 180 °C. Because EVA 7360M has a melt mass-flow rate near 7.5 g/10 min, its apparent viscosity at 100 s⁻¹ and 190 °C is lower than that of a 2.5 g/10 min EVA. This lowers specific energy input by roughly 3–5% per 0.5 g/10 min MFR increase but also reduces residence-time-induced pressure generation. Screw speed, feed rate, and die resistance remain co-determinants. At filler loadings above 50 wt% calcium carbonate or magnesium hydroxide, the pressure rise can exceed 200 bar unless distributive mixing elements are added and the rear barrel temperature is reduced to avoid premature fusion. Torque-limited operation on an extruder with a 150 kW drive may require feed-rate reduction because the high-viscosity filler phase dominates the melt-pressure signature. Published data for 7360M in a specific 40:1 L/D configuration is limited; therefore, any pressure setpoint should be verified against the torque curve of the specific machine and the batch-specific melt-flow rate.
On a 1800 kN clamping-force injection molder, the decomposition window of azo-type chemical blowing agents places a narrow thermal boundary around the screw profile. Azodicarbonamide decomposes at approximately 150–205 °C; the screw barrel settings for 7360M are therefore usually staged from 90–110 °C at the feed throat to 170–190 °C at the shut-off nozzle. Premature gas generation in the check ring and feed zone is controlled by maintaining the rear zone below the blowing agent decomposition onset and by using a shut-off nozzle to seal the melt reservoir. When molded density is reduced to 0.20 g/cm³, the expansion pressure generated by the blowing agent can separate mold halves if the clamp force is not sufficient; a clamping force of 1800 kN is commonly adequate for midsize midsoles, but the required force must be calculated from peak cavity pressure and projected area. Nucleating masterbatch at 0.5–1.0 phr produces a typical cell size of 0.10–0.30 mm; higher addition reduces cell size but increases compound viscosity and gas pressure. Crosslinking with dicumyl peroxide at 0.4–0.7 phr may be used to stabilize cell walls during expansion because the 21 wt% VA content broadens the gel region relative to lower-VA grades. Foam made from 7360M typically shows lower Shore A hardness than a 14 wt% VA EVA at equal density but may require longer cooling time before demolding.
Differential scanning calorimetry conducted at 10 K/min under nitrogen purge in accordance with ISO 11357-3 reveals a suppression of the polyethylene crystallite melting endotherm relative to a 14 wt% VA grade. The crystallization onset temperature of 7360M is shifted downward by approximately 7–10 °C compared with an 18 wt% VA, 2.5 g/10 min EVA grade. The lower heat of fusion extends the time required for the molded part to develop dimensional stability. Parts removed from the tool at 45 °C may continue to crystallize and shrink by 0.4–0.8% over 24 h unless cooling fixtures or pressure dwell are adjusted. This shrinkage differential is operational rather than cosmetic: in multi-component assemblies, dimensional mismatch can exceed 0.2 mm over a 200 mm part length. The shift in crystallization also affects infrared welding and high-frequency welding of transparent or translucent articles because the heat-seal window is lower than that of a low-VA EVA film grade. In calendering or sheet extrusion, roll-stack temperatures must be reduced by 5–10 °C to prevent sticking when the sheet surface reaches the lower melt range.
For hot-melt adhesive modification, the 21 wt% vinyl acetate content lowers the ring-and-ball softening point and extends open time when compounded with hydrocarbon resins and paraffin waxes. At a 60:40 polymer-to-tackifier ratio, a formulator transferring from a 14 wt% VA, 2.0 g/10 min EVA typically observes a ring-and-ball softening point reduction of approximately 8–12 °C as determined by ASTM E28. This shift improves low-temperature substrate wetting but reduces heat resistance and shear adhesion failure temperature unless a higher softening resin or a polyester crosslinker is introduced. Mixing in a vertical thermostatic mixer at 150 °C should be limited to 60 min because prolonged exposure generates acetic acid degradation products and raises yellowing index. Nitrogen blanketing is recommended when the adhesive is held at temperature for more than 30 min. If the formulation contains ester-based plasticizers, compatibility with EVA 7360M is concentration-dependent; above 15 phr of low-molecular-weight ester plasticizer, surface exudation can occur within 72 h at 23 °C and 50% relative humidity.
Compounding lines using magnesium hydroxide or aluminum trihydrate for low-smoke halogen-free cable compounds benefit from the polar EVA matrix. At filler loadings of 55–65 wt%, the higher VA content of 7360M improves filler wetting and reduces elongation-at-break loss relative to a lower-VA EVA. However, melt viscosity increases sharply at filler levels above 65 wt%, and the pH of the flame retardant must be controlled between 8.0 and 10.0 to avoid acid-base reactions with residual acetic acid. Thermal gravimetric analysis under nitrogen shows a two-stage decomposition: deacetylation occurs at approximately 300–400 °C, followed by polyene main-chain scission above 400 °C. The released acetic acid is corrosive to calcium carbonate fillers and can reduce end-product insulation resistance if not neutralized during compounding. Batch-to-batch variance in melt-flow stability at the hopper is typically below ±0.5 g/10 min, but this variance becomes process-relevant when the extruder is run at 85% torque because a slight viscosity increase can trip the machine safety interlock.
If existing tooling was dimensioned for an 18 wt% VA, 2.0 g/10 min EVA with a linear shrinkage allowance of 1.4%, substitution of 7360M may require re-cutting or process adjustments because lower crystallinity and lower melt strength can shift post-mold shrinkage to 1.8–2.2%. The ejection temperature may need to be reduced to 30–40 °C to prevent distortion during hot handling. At equivalent foam density, as-molded Shore A hardness decreases by approximately 8–12 points. Compression set at 50% deflection after 24 h at 23 °C may increase slightly unless the peroxide crosslinking density is maintained. Cycle-time penalties are typically smaller than expected because the higher MFR reduces injection fill time; however, cooling time must be extended when wall thickness exceeds 8 mm. Molders should measure peak cavity pressure during the first ten shots and compare it with the value obtained with the previous EVA grade. If peak cavity pressure drops by more than 10%, melt strength may be insufficient for the existing gate geometry, and a smaller gate or a nucleating agent addition should be evaluated before full production.
Unopened pellets should be stored at ambient temperature below 35 °C and at relative humidity below 70%. Pre-drying is not required when ambient RH is below 60% and the pellet surface is dry; at RH above 60%, drying at 55–65 °C for 2–4 h in a dehumidifying hopper dryer with a dew point below −20 °C is recommended to prevent surface moisture streaks and internal void formation. The grade should not be combined with amine-based additives that can accelerate acetic acid generation or with strong acid catalysts that promote transesterification. For food-contact and restricted-substance evaluations, the matrix below identifies standards commonly referenced for ethylene-vinyl acetate copolymers. Compliance is batch-specific and must be verified against the supplier’s certificate of analysis and the final article’s use conditions.
| Measurement or regulatory framework | Standard or citation | Typical evaluation boundary |
|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 / ASTM D1238-20 | 190 °C, 2.16 kg load, reported in g/10 min |
| Density | ISO 1183-1:2019 / ASTM D792-20 | 0.94 g/cm³ nominal |
| US food contact | FDA 21 CFR 177.1350 | Ethylene-vinyl acetate copolymers; end-use extraction limitations apply |
| EU food contact | EU Regulation (EU) No 10/2011 | Overall migration limit 10 mg/dm² for plastic materials and articles |
| Restricted substances in electrical equipment | RoHS Directive 2011/65/EU | Lead 0.1 wt%, cadmium 0.01 wt%, PBDE/PBB 0.1 wt% in homogeneous material |
| Chemical safety assessment | REACH Regulation (EC) No 1907/2006 | SVHC candidate list screening for substances of very high concern |
