| HS Code | 467323 |
| Material Type | Crosslinkable Ethylene Vinyl Acetate (EVA) Copolymer Compound for Foam |
| Vinyl Acetate Content | 30 wt% |
| Melt Flow Rate 190 C 2 16 Kg | 1.6 g/10 min |
| Density 23 C | 0.95 g/cm³ |
| Melting Point Dsc | 70 °C |
| Vicat Softening Temperature | 45 °C |
| Shore A Hardness | 75 |
| Tensile Strength At Break | 18 MPa |
| Elongation At Break | 750% |
| Brittleness Temperature | -70 °C |
| Typical Crosslinking Temperature | 165 °C |
| Suitable Foaming Temperature Range | 150-180 °C |
As an accredited EVAtech 160I/30C EVA Copolymer Compound,Crosslinkable Foam Grade factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | EVAtech 160I/30C is supplied in 25 kg polyethylene bags on pallets, wrapped for safe transport and storage. |
| Container Loading (20′ FCL) | EVAtech 160I/30C: 25 kg bags on pallets, shrink-wrapped, loaded in 20′ FCL, about 20 metric tons per container. |
| Shipping | Ship as EVA copolymer pellets in 25 kg sealed bags on shrink-wrapped pallets. Keep dry and away from direct sunlight, heat, or ignition sources. No hazardous goods classification, but avoid dust accumulation. Use covered containers or trucks and store in a cool, ventilated area. |
| Storage | Store EVAtech 160I/30C in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture pickup and contamination. Maintain moderate humidity conditions and avoid contact with strong oxidizers. Recommended storage temperature is below 30°C. Use FIFO to ensure optimal processing and shelf life. |
| Shelf Life | Shelf life is typically 12 months from manufacture when stored in original, unopened packaging under cool, dry conditions. |
In midsole production on 75 L intermeshing internal mixers with two-wing rotors at 35–45 rpm, EVAtech 160I/30C is fluxed below 110 °C before the azodicarbonamide/dicumyl peroxide package is added. The 30% vinyl acetate content shifts the DSC melt endotherm to 72–78 °C, allowing gas evolution and peroxide crosslinking to proceed in overlapping temperature ranges. The standard formulation for compression-molded sports midsoles is EVAtech 160I/30C 100 phr, azodicarbonamide 2.5–5.0 phr, dicumyl peroxide 0.5–0.9 phr, zinc oxide 1.0–2.0 phr, zinc stearate 0.5–1.0 phr, and calcium carbonate 5–15 phr where Shore C hardness above 55 is specified. Higher filler loadings above 15 phr reduce elongation at break and produce edge splitting during demolding, particularly in dual-density constructions where the second skin layer is injected after first expansion.
During compression molding at 165–175 °C and 150–200 kg/cm², mold cycle time is 8–15 min for midsoles up to 15 mm. Zinc oxide and zinc stearate shift azodicarbonamide decomposition from the nominal 200–210 °C range to 155–165 °C, while dicumyl peroxide half-life at 170 °C is approximately 1 min; therefore network development accelerates within the first 2–4 min. A mismatch between gas evolution and the crosslink plateau greater than 5 °C produces split pre-formed skins or collapsed cells. DCP addition above 0.9 phr reduces trouser tear values measured under ISO 34-1:2022 relative to the 0.7 phr control, while DCP below 0.5 phr yields compression set above 30% after 24 h at 50 °C under ISO 815-1:2019. Production lines observe ±3 °C upper platen variation as the practical control boundary before cell-size banding appears in dual-density midsoles. Compliance for athletic and occupational footwear components is verified against REACH Annex XVII, ZDHC MRSL Level 1, and DIN EN ISO 20345:2022 where occupational footwear parts are specified. Material properties are measured per ISO 1798:2008, ISO 815-1:2019, ISO 845:2006, and ISO 34-1:2022. Terminal products include dual-density EVA midsoles for running and trail footwear, orthotic footbed cores, safety shoe comfort midsoles, and expanded EVA outsole sheets for sandals.
Continuous gasket extrusion of EVAtech 160I/30C at 40–70 kg/h requires pellet pre-drying at 70–80 °C for 2–3 h when ambient RH exceeds 60%; residual moisture above 500 ppm produces pinholes and irregular closed-cell morphology at sheet thicknesses below 8 mm. The compound is formulated with EVAtech 160I/30C 100 phr, azodicarbonamide 4–7 phr, dicumyl peroxide 0.7–1.1 phr, zinc oxide 1.0–2.5 phr, carbon black N550 2–5 phr, and calcium carbonate 10–30 phr for densified gaskets with apparent density 0.20–0.35 g/cm³. Sulfur-donor accelerators and amine-based antistatic additives are excluded because they deplete peroxide and shift the cure state toward prematurely crosslinked surface layers. Sheets are crosslinked in hot-air ovens at 160–180 °C for 6–12 min at 10 mm thickness or compression molded at 165 °C for 12–18 min. Closed-cell products are tested to ASTM D1056-14 classes 2C1 and 2C2 for density, water absorption, and compression deflection. FMVSS 302 burn rate is required to remain below 100 mm/min for transport-related gaskets. RoHS Directive 2011/65/EU and REACH Annex XVII entries 50–51 restrict PAH content in electrical enclosure seals. Terminal products include rectangular HVAC flange gaskets, panel seals for sheet metal enclosures, expansion joint profile fillers, and vibration damping pads for compressor housings.
When thermoforming automotive cabin liners, EVAtech 160I/30C sheet must be crosslinked sufficiently to survive 130–150 °C forming temperatures without thickness loss greater than 20% in deep-draw areas. The recommended formulation is EVAtech 160I/30C 100 phr, azodicarbonamide 3–5 phr, dicumyl peroxide 0.6–0.9 phr, zinc stearate 0.5–1.0 phr, aluminum trihydrate 20–40 phr, and black masterbatch 2–4 phr. Aluminum trihydrate loadings above 40 phr raise compound viscosity, requiring a 48:1 L/D twin-screw extruder temperature profile below 115 °C; otherwise premature foaming occurs at the die face and reduces cell uniformity in subsequent calendering.
Calendered sheets of 2–8 mm are crosslink-foamed in continuous hot-air ovens at 160–180 °C for 8–12 min, laminated with polyester or polyamide textile layers, and vacuum thermoformed at 120–140 °C. Compliance for cabin interior components includes VDA 278:2011 VOC and fog condensation reporting, FMVSS 302 with burn rate below 100 mm/min, REACH Annex XVII, and RoHS Directive 2011/65/EU. Terminal products include door panel inserts, seat back pockets, dashboard insulator pads, trunk floor supports, and roof liner edge filler strips. This formulation is not intended for visible Class A surface skins without additional flame-lamination and embossed coverstock, because cell structure and surface flatness are controlled for hidden structural padding rather than cosmetic grain retention.
In rehabilitation mat manufacturing, EVAtech 160I/30C is processed on multi-opening compression presses with 1500 t clamp force, where slab thickness of 30–60 mm requires stepwise pressure release to restrict post-expansion shrinkage to below 6%. The typical compound for thick high-resilience mats is EVAtech 160I/30C 100 phr, azodicarbonamide 4–6 phr, dicumyl peroxide 0.5–0.8 phr, calcium carbonate 8–18 phr, and stearic acid 0.5–1.0 phr. Lower peroxide residuals are preferred because thicker slabs retain heat during cooling, and residual DCP above 0.1% produces a characteristic acidic odor after hermetic packaging. Mixing is conducted on a 35 L kneader below 105 °C, followed by two-roll mill refinement and slab pre-forming. Foam expansion proceeds at 160–170 °C for 35–45 min at 60 mm thickness, with cycle time increasing approximately 1 min/mm above 30 mm.
Compliance for children’s mats and play surfaces is tested under EU Toy Safety Directive 2009/48/EC and EN 71-3:2019+A1:2021 for migration of elements; adult fitness and rehabilitation mats are assessed under REACH Annex XVII and ISO 8124-1 where relevant. Terminal products include physical therapy mats, yoga blocks, knee pads, gym floor tiles, and child play mats. This grade is not specified for hot yoga mats requiring sustained deformation resistance above 70 °C without additional compression set validation.
When compression set must remain below 12% after 24 h at 50 °C under ISO 815-1:2019, EVAtech 160I/30C is compounded with dicumyl peroxide at 0.7–1.0 phr; peroxide levels below 0.5 phr produce set values above 25%, particularly after repeated impact cycles in limb protector conditioning. The complete protective padding formulation is EVAtech 160I/30C 100 phr, azodicarbonamide 3–6 phr, dicumyl peroxide 0.7–1.0 phr, zinc oxide 1.0–2.0 phr, and zinc stearate 0.5–1.0 phr. Filler loadings are kept below 10 phr to preserve elongation at break above 150% under ISO 1798:2008, because excessive rigidity reduces energy attenuation and produces brittle failure after low-temperature conditioning.
Compact pre-forms are mixed on a two-roll mill at 85–95 °C, then compression molded at 165–170 °C for 10–15 min at thicknesses of 10–20 mm. Die cutting is performed after 24 h ambient conditioning to permit dimensional stabilization. Compliance for motorcycle and sports protectors is verified under EN 1621-1:2012 for limb protectors; helmet comfort liners are used as secondary padding interfacing with EPS liners and are not the primary impact attenuation layer under FMVSS 218 or EN 1078. Terminal products include knee and elbow protectors, shin guards, sports protective vest inserts, and comfort padding in industrial knee pads. This compound is not the sole energy attenuator in motorcycle back protector applications requiring EN 1621-2:2014; published data for this specific configuration is limited.
Protective packaging of optical inspection modules and PCB fixtures imposes closure force and outgassing constraints rather than density alone. EVAtech 160I/30C is compounded at 100 phr with azodicarbonamide 3–5 phr, dicumyl peroxide 0.5–0.9 phr, zinc oxide 1.0–2.0 phr, and calcium carbonate 5–15 phr, producing a crosslinked foam with apparent density 0.10–0.20 g/cm³. Sulfur-donor secondary accelerators and amine-based antistatic packages are excluded; raw-material chloride is controlled below 50 ppm for copper-contact packaging applications. Slab foam is produced in autoclave presses at 160–170 °C for 25–40 min, then water-jet cut or CNC routed into three-dimensional inserts; cell size is controlled by azodicarbonamide particle size 6–12 µm and dispersion temperature.
This grade is not intrinsically static dissipative and must not be designated as ESD protective under IEC 61340-5-1; when used around electrostatic discharge sensitive devices, it is placed inside an ESD shielding bag or conductive corrugated enclosure as mechanical cushioning only. Compliance is verified under RoHS Directive 2011/65/EU and REACH Annex XVII. Terminal products include lens barrel inserts, drone gimbal packaging liners, PCB edge protectors, and non-contact frame liners for semiconductor transport trays. If static dissipative foam is required, carbon-loaded EVA foil laminated to the surface is the accepted alternative, because bulk carbon addition above 10 phr destroys closed-cell structure and raises compression set.
For marine leisure fenders and floating mat decks, EVAtech 160I/30C is formulated with azodicarbonamide 5–8 phr, dicumyl peroxide 0.8–1.2 phr, UV stabilizer 0.5–1.0 phr, carbon black 2–4 phr, and zinc oxide 1.5–2.5 phr. Higher blowing agent loadings reduce apparent density to 0.05–0.15 g/cm³, and the closed-cell structure restricts water absorption to below 2% by volume under ASTM D1056-14 immersion conditions after 96 h. Large slabs are foamed in a 1.2 m × 2.4 m compression mold at 160–175 °C for 20–40 min; slow cooling under pressure prevents post-mold blistering caused by residual gas pressure in oversized slabs.
Thermal lamination or hot-melt bonding joins multiple sheets to form 50–100 mm thick floating decks and fender cores. Compliance for recreational marine products references ASTM D3575-20 for olefin foam physical properties, ISO 845:2006 for apparent density, and ISO 4892-2:2013 for UV weathering cycles. These products are not intended for SOLAS-approved personal flotation devices; life-saving appliances require separate design approval under IMO Res. MSC.81(70). Terminal products include floating mat decks, dock edge bumper cores, boat fender inserts, kayak seat pads, and swim platform cushioning strips. Published data for this specific configuration in wave-impact fatigue is limited, so long-term dynamic compression set should be validated at the component level.
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EVAtech 160I/30C is an ethylene-vinyl acetate copolymer compound formulated for peroxide-initiated crosslinkable foam conversion. The model designation is read in common EVA-grade nomenclature: the 30C segment identifies a vinyl acetate comonomer content of 30 wt%, while the 160I segment identifies a melt flow index of 160 g/10 min when measured under ISO 1133-1:2022 at 190°C/2.16 kg. The compound is supplied as pellets and contains a blowing agent, cure co-agent, and processing aid package; the exact formulation is supplier-specific and requires confirmation against the manufacturer’s technical datasheet. Unfilled compound density is approximately 0.95 g/cm³ according to ISO 1183-1:2019, while process-dependent foam density typically falls between 0.08 g/cm³ and 0.25 g/cm³. The melting endotherm by differential scanning calorimetry is broad, with a peak melting range of 75–85°C. The high vinyl acetate content reduces crystallinity and improves low-temperature flexibility relative to 18 wt% and 22 wt% VA EVA grades, but it also lowers hardness and increases polarity. Downstream application fields include closed-cell foam for footwear midsoles, industrial gaskets, thermal insulation profiles, and protective packaging. Published data for this specific EVAtech configuration is limited outside the supplier lot certificate; the material-class behaviour described here is derived from published EVA copolymer and crosslinked foam literature.
In a conventional EVA compound, melt strength and dimensional stability depend on molecular weight, chain branching, and crystallization. A crosslinkable foam grade adds a covalent network during processing. The network increases extensional viscosity and stabilizes expanding cell walls, permitting density reductions that would otherwise collapse a high-melt-flow resin. Gel content after cure, determined by solvent extraction using ASTM D2765-16 Method C, is used as a production control. Typical target gel fractions for crosslinked EVA foams lie between 65% and 80%; values below 60% generally indicate incomplete cure and can produce compression set failure under cyclic loading, while values above 90% may reduce elongation at break and foam recoverability. For EVAtech 160I/30C, the 30 wt% VA content places the compound in the flexible segment of the EVA foam range. Lower-VA grades, such as 18 wt% VA with melt index 2.5 g/10 min, produce stiffer, more crystalline foams with higher hardness and better hydrocarbon resistance, but poorer low-temperature flex fatigue. Higher-VA grades above 40 wt% VA produce softer, more oil-resistant foams but can exhibit higher compression set and lower crosslink density due to radical transfer at the acetoxy group. The 160 g/10 min melt index of EVAtech 160I/30C reduces melt temperature requirements and improves thin-wall fill in injection moulding, but it demands rapid cure activation before cell coalescence. Table 1 compares representative values for this class of crosslinkable EVA foam compounds.
| Property | EVAtech 160I/30C class | Lower-VA foam grade | Higher-VA foam grade |
|---|---|---|---|
| Vinyl acetate content | 30 wt% | 18 wt% | 40 wt% |
| Melt flow index | 160 g/10 min (190°C/2.16 kg) | 2.5 g/10 min (190°C/2.16 kg) | 30 g/10 min (190°C/2.16 kg) |
| Solid density | 0.95 g/cm³ | 0.94 g/cm³ | 0.97 g/cm³ |
| Foam density range | 0.08–0.25 g/cm³ | 0.10–0.30 g/cm³ | 0.08–0.25 g/cm³ |
| Shore A hardness of solid moulding | 65–75 | 85–90 | 40–50 |
| Low-temperature brittle point | ≤ -70°C | ≤ -40°C | ≤ -70°C |
| Typical peroxide gel target | 65–80% | 70–85% | 55–70% |
Crosslinked EVA foam processing is a coupled thermal process. The peroxide must generate crosslinks rapidly enough to set cell walls, but not so early that the melt cannot expand. Dicumyl peroxide, the most common cure agent for EVA foam, has a half-life of approximately 10 h at 117°C, 1 h at 135°C, and 1 min at 171°C. Azodicarbonamide, a high-gas-yield blowing agent, shows a broad exothermic decomposition with peak evolution near 195–205°C at 10°C/min DSC heating rate; activators such as zinc oxide or zinc stearate can lower the decomposition peak by 10–20°C and increase gas yield rate. In a peroxide-azodicarbonamide EVA foam system, the practical processing window is narrow. If the mould surface is 165°C and the decomposition onset of activated azodicarbonamide is 185°C, the cure and foam stages remain simultaneous only if the compound reaches the decomposition temperature before the peroxide is depleted. A mismatch of more than 5°C in the effective decomposition window can produce density gradients, coarse cell structure at the centre, or uncured skin layers. Moving die rheometer data, typically reported as ts2, t50, and t90 at 175°C and 1° arc according to ASTM D5289-19a, are used to define demould time; production demould times are usually set at t90 plus 10–15% to avoid post-demould expansion.
In compounding operations, the temperature profile must remain below the azodicarbonamide decomposition onset. For a co-rotating twin-screw extruder with a 44:1 L/D ratio, barrel set points of 90–105°C and a screw speed of 200–300 min⁻¹ are typical for dispersing the blowing agent without premature gas evolution. The die head pressure is usually maintained above 5 MPa to keep decomposition gases dissolved in the melt; if the pressure drops below the gas solubility limit, pre-foaming occurs and the pellet surface becomes porous. Porous pellets absorb moisture unevenly and can create batch-to-batch density variation. The high melt index of EVAtech 160I/30C permits lower head pressure than a 2.5 g/10 min EVA grade, making venting and die pressure control more critical; published data for this specific configuration is limited, but the pressure sensitivity is consistent with the reduced viscosity of high-MI EVA copolymers.
On a production injection-moulding line for crosslinked EVA foam midsoles, the process is divided into compound plastication, mould filling, chemical cure, and pressure-release expansion. EVAtech 160I/30C can be plastified at melt temperatures of 95–110°C, which is lower than conventional EVA foam grades because of its 160 g/10 min melt flow index. A typical injection speed of 40–80 mm/s is used for thin midsole cavities; higher speeds may generate shear heating above 130°C and initiate premature cure at the gate. The mould is heated to 165–180°C to activate dicumyl peroxide and azodicarbonamide. Clamp force is calculated from the projected area and the expansion pressure of the foaming melt, not from solid melt pressure alone; an 800 kN clamp may be adequate for a two-cavity midsole tool if the foaming pressure does not exceed 15 MPa in the cavity. Vent depth is a limiting factor: vents deeper than 0.02 mm can allow gas escape and produce excessive flash, while vents shallower than 0.01 mm can trap volatile residues and create surface pinholes. After cure, the mould opening must be controlled to allow foam expansion without tearing. If the part is constrained too early, cell walls fracture at the surface; if expansion is uncontrolled, density drops below the target and dimensional stability decreases. Demoulding release agents should be selected for high-temperature EVA foam tools; silicone-based external release agents can interfere with post-decoration adhesion unless cleaned using a compatible solvent system. These observations represent standard production-scale EVA foam moulding practice rather than EVAtech-specific qualification data.
EVA copolymer compounds are not strongly hygroscopic, but moisture uptake above 0.05% can interfere with chemical foaming. When relative humidity exceeds 60%, pre-drying is required before extrusion or injection moulding. A desiccant dryer operating at 60°C for 4 h with a dew point of -40°C typically reduces moisture to below 0.03%. Inadequately dried pellets can generate steam bubbles that compete with azodicarbonamide gas evolution, producing irregular cell-size distribution and surface voids. EVAtech 160I/30C should be kept in sealed moisture-barrier packaging until use; opened containers should be returned to a dry environment and consumed within 24 h in an uncontrolled >60% RH production hall unless dryer capacity is available. Storage temperature should remain below 30°C and away from direct UV exposure to avoid premature degradation of the blowing agent package. The blowing agent can settle within a container during prolonged transport; pellet conditioning by slow tumbling is recommended before sampling for melt-flow testing. Batch-to-batch variation in melt flow index for high-MI EVA grades can be a processing bottleneck because small differences in shear viscosity affect fill time and foam nucleation. A variation of ±15 g/10 min may require adjustment of screw speed or injection velocity, but published data for this specific EVAtech configuration is limited. Incoming inspection should include melt flow index using ISO 1133-1:2022, moisture content by Karl Fischer titration using ISO 15512:2019, and bulk density. The compound should not be blended with amine-based stabilizers or sulfur-bearing additives; amine species can scavenge free radicals and reduce peroxide crosslink density, while sulfur can interfere with the azodicarbonamide decomposition pathway. Phenolic antioxidants and phosphite stabilizers are preferred if additional stabilization is required.
Base EVA copolymer status under FDA 21 CFR 177.1350 applies only to the unmodified resin; the crosslinked foam formulation must be assessed for extraction limits and blowing agent residues. For EU installations, the compound is subject to REACH registration and, where relevant, RoHS Directive 2011/65/EU restrictions on lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE. A supplier statement should be obtained for azodicarbonamide decomposition residues if the foam is used in food-contact or toy applications.
The vinyl acetate content of 30 wt% reduces polyethylene crystallinity, broadens the glass-to-rubber transition, and improves flex fatigue at low temperatures relative to lower-VA EVA copolymers. Published data for EVA copolymers show that the glass transition temperature of 30 wt% VA EVA is approximately -25°C, while 18 wt% VA EVA can have a brittle point near -40°C and is less suitable for applications requiring repeated flexing below -20°C. Low-temperature brittle point is commonly determined by ASTM D746-20. The foam made from EVAtech 160I/30C is therefore specified for footwear midsoles and cushioning parts exposed to cold climates. The trade-off is chemical resistance: increasing vinyl acetate content increases polarity and reduces resistance to nonpolar hydrocarbon oils. EVA foam with 30 wt% VA swells less in polar liquids but more in aliphatic hydrocarbons than an 18 wt% VA grade. For gasket applications involving mineral oil, compatibility testing should follow ISO 1817:2022 with defined temperature and time conditions. Compression set after constant deflection should be measured using ASTM D395-18 Method B at 50°C for 22 h; typical formulated EVA foam values are 30–60% depending on cure density and foam density. The 30 wt% VA grade is less rigid than lower-VA grades, which reduces the hardness of the final foam. Hardness of crosslinked EVA foam is commonly reported as Asker C or Shore A; the same base density may produce an Asker C hardness of 30–45 for a 30 wt% VA foam compared with 45–60 for an 18 wt% VA foam at equivalent crosslink density. The material should not be used in continuous contact with strong oxidizing acids, chlorinated solvents, or high-aromatic hydrocarbons without specific compatibility testing.
