| HS Code | 134087 |
| Vinyl Acetate Content | 10% |
| Melt Flow Index 190 C 2 16 Kg | 13 g/10 min |
| Density | 0.932 g/cm³ |
| Melting Point | 93°C |
| Vicat Softening Temperature | 64°C |
| Tensile Strength At Break | 17 MPa |
| Elongation At Break | 750% |
| Hardness | 94 Shore A |
| Brittleness Temperature | -70°C |
| Crosslinking | Peroxide crosslinkable |
| Foamability | Crosslinkable foam grade |
As an accredited EVAtech 130S/10 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 | Packaged in 25 kg polyethylene bags, palletized and stretch-wrapped for safe transport and storage. Quantity: 25 kg per bag. |
| Container Loading (20′ FCL) | 20′ FCL loaded with palletized bags of EVAtech 130S/10, securely stowed; approximately 20–25 metric tons per container. |
| Shipping | EVAtech 130S/10 is shipped as solid pellets in sealed moisture-proof bags or bulk containers. Store in a cool, dry area away from heat, ignition sources, and direct sunlight. No dangerous goods classification; standard dry freight transport is suitable. Avoid prolonged exposure to high temperatures during transit. |
| Storage | Store EVAtech 130S/10 in original, sealed packaging in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Maintain temperatures below 30°C to prevent premature crosslinking. Keep away from oxidizing agents, peroxides, and moisture. Protect from physical damage and contamination. Use within shelf life; rotate stock accordingly. |
| Shelf Life | Shelf life: 6 months from manufacture if stored unopened, below 30°C, away from sunlight and moisture. |
On compression-molding lines producing crosslinked EVA midsoles, EVAtech 130S/10 is pre-blended on a two-roll mill or in a dispersion kneader at 90–105°C with 4.0–6.5 phr activated azodicarbonamide, 0.6–1.0 phr dicumyl peroxide, 0.8–1.5 phr zinc oxide, and 0.5–1.2 phr zinc stearate; the nominal 10 wt% vinyl acetate content lowers the crystalline melting range relative to LDPE, allowing the activated azodicarbonamide decomposition exotherm, which yields approximately 220 mL/g of gas at STP, to overlap with peroxide cure kinetics inside a mold temperature window of 150–162°C. Process technicians record moving-die rheometer torque at 155°C and reject batches when T10 is below 60 s or T90 exceeds 480 s, because early crosslinking traps gas in the melt skin and produces internal fissures, while late cure leaves the cell walls insufficiently stabilized before mold opening. Molded density after 24 h dimensional stabilization at 20–25°C and 45–55% RH typically falls between 0.12 g/cm³ and 0.20 g/cm³ for midsole foam; compression set measured under ASTM D3575-14 suffix D or ISO 1856:2018 at 50% compression for 6 h at 50°C is generally reported between 20% and 45% for this category, but converter validation is required because published data for this specific compound configuration are limited. When skived into 2.0–3.0 mm sockliner sheets and die-cut, the cut cell edges are thermally sealed before adhesive lamination, as open cells reduce peel strength under ASTM D903-17 through adhesive wicking.
The controlling failure mode in closed-cell EVA marine fenders and buoyancy blocks is not impact tearing but slow gas diffusion through the cell walls, which reduces recovery force after repeated compression; therefore the compound is formulated with a higher peroxide loading of 0.8–1.2 phr and co-curing agents such as trimethylolpropane trimethacrylate at 0.5–1.0 phr to raise gel fraction above 70% when measured by xylene extraction, although published data for EVAtech 130S/10 in this specific formulation are limited. Large block molds are crosslinked in hydraulic compression presses at 155–168°C with a two-stage pressure profile: the initial 10–15 bar phase expels entrained air from the preform, and the second 50–80 bar phase maintains closed-cell geometry while gas expands the melt. Water absorption tested under ASTM D3575-14 suffix L should remain below 3% by volume after 96 h immersion at 23°C; higher values indicate interconnected cells or surface fissures caused by premature crosslinking. Ultraviolet stabilization for marine service uses a hindered amine light stabilizer package and 2–3 wt% carbon black, but amine-based antioxidants must be eliminated or strictly limited because their nitrogen-containing functional groups can interfere with dicumyl peroxide cure and shift T90 unexpectedly. Recovery after repeated compression is commonly specified through ISO 3386-1 at 25% or 50% deflection, and the material must demonstrate less than 10% thickness loss after cyclic loading; converters serving harbor, dockside, and ship-fender applications typically require salt-spray resistance documentation under ISO 9227:2022 for external metal fasteners rather than for the foam itself.
Automotive interior NVH engineers evaluate crosslinked EVA sheet primarily through hardness, compression deflection, fogging, and flammability rather than tensile strength, because the material is die-cut into door water shields, headliner spacers, and seating pressure-distribution pads. The compound is continuously cured in a rotocure press at 155–170°C under 15–25 bar, and the post-cure sheet is annealed at 70–80°C for 6–8 h to strip residual blowing gas and low-molecular-weight decomposition products before lamination. Volatile organic compound and fogging performance under VDA 278:2011-10 often require total VOC emissions below 100 µg/g and fogging condensate below 250 µg/g depending on OEM specification; converters therefore avoid external release agents and use embossed release paper or plasma-cleaned steel plates. Fire performance is validated under 49 CFR 571.302 (FMVSS 302) with a horizontal burn rate not exceeding 102 mm/min, although the effective result depends on sheet thickness and skin density. The process conflict is cell collapse at high line speed: when the cure time is shortened below the ADC gas volume expansion plateau, the center of a 20 mm sheet can remain above 0.30 g/cm³ while the surfaces drop below 0.10 g/cm³, producing a hard-skinned pad with poor compression recovery. Thickness tolerance is normally held to ±0.5 mm for die-cut parts under ISO 3302-1:2014 or equivalent supplier drawing callouts, and the EVA foam must survive heat aging at 90°C for 7 days without cracking when tested per ISO 188:2011.
Compliance and skin-contact safety for orthotic padding are governed by two independent variables: cure completeness and residual blowing agent decomposition products. EVAtech 130S/10 can be compression-molded into 2–12 mm sheets with post-expansion densities from 0.15 g/cm³ to 0.40 g/cm³, after which the sheets are skived, thermoformed, or CNC-machined into arch pads, heel lifts, and accommodative insoles. Hardness measured under ISO 868:2003 or ASTM D2240-15 typically ranges from Shore A 30 to Shore A 55 at the stated density band, but exact values must be generated on the converter's cure press because hardness in crosslinked EVA foam is non-linear with density and skin layer. Residual azodicarbonamide decomposition products, particularly ammonia and other nitrogenous residues, require careful cure profiling because incomplete decomposition can leave irritant residues; for skin-contact medical devices, the cured foam is often subjected to a post-cure vacuum cycle at 60–80°C for 4–6 h to strip volatiles. Biocompatibility documentation under ISO 10993-5:2009 and ISO 10993-10:2010 is required when the component is classified as a medical device contacting intact skin, and the converter must qualify the exact cured formulation because the standard does not transfer across different blowing agent packages. Food-contact compliance under FDA 21 CFR 177.1350 may apply only if the orthotic is used in a production environment that cross-contaminates or if a hygienic insole is marketed for direct food-processing-floor footwear, but the supplier of record should confirm extraction limits for the specific grade.
| Regulatory or test domain | Referenced standard | Typical result or documentation |
|---|---|---|
| Flexible olefin foam compression set | ASTM D3575-14 suffix D | 20–45% at 50% deflection, 6 h, 50°C |
| Apparent density | ISO 845:2006 | 0.07–0.40 g/cm³ depending on segment |
| Skin contact biocompatibility | ISO 10993-5:2009, ISO 10993-10:2010 | Cytotoxicity and irritation report on cured formulation |
| Food-contact EVA copolymer | FDA 21 CFR 177.1350 | Supplier compliance statement for extraction limits |
| Automotive interior flammability | 49 CFR 571.302 (FMVSS 302) | Horizontal burn rate ≤ 102 mm/min |
| Volatile constituents | VDA 278:2011-10 | OEM-specific VOC and fogging thresholds |
Because athletic matting, gym flooring tiles, and anti-fatigue mats are installed in repeated impact environments, the compound is crosslinked into sheet in thicknesses from 10 mm to 40 mm with target densities between 0.10 g/cm³ and 0.18 g/cm³, and the sheet is often laminated on the top surface with a non-slip vinyl or rubber wear layer to limit tear propagation under ASTM D3575-14 suffix G or ISO 34-1:2022. Fatigue testing of closed-cell EVA mats is generally specified as thickness loss after a defined compression cycle count; a common validation protocol applies 50% compression for 100,000 cycles at 1 Hz and rejects parts with thickness loss above 15% or visible cell-wall rupture. Batches produced on multi-opening hydraulic presses frequently vary by 0.01–0.03 g/cm³ between top, middle, and bottom platens because platen temperature uniformity is typically ±3°C; that density spread changes Shore hardness enough that final sorting by apparent density under ISO 845:2006 is required before lamination. Tear strength in the skived sheet depends more on cell size distribution than on base polymer molecular weight, so converters use zinc stearate or micronized talc as a cell nucleator at 0.5–1.0 phr to maintain average cell diameter below 0.5 mm when measured by optical microscopy of a cut cross-section.
For reusable interleaving, edge-protection strips, and pallet dunnage, the same crosslinked EVA sheet is cut to size at densities between 0.07 g/cm³ and 0.12 g/cm³, where closed-cell recovery under repeated compression is sufficient without lamination.
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The EVAtech 130S/10 EVA copolymer compound is a crosslinkable foam grade based on ethylene–vinyl acetate copolymer. The product is supplied as a pelletized compound for peroxide-initiated crosslinking and chemical expansion in closed-cell foam manufacturing. The model string is not a standardized designation under ISO or ASTM, and the `130S/10` sequence should be read as supplier nomenclature. In common EVA grade conventions, the `10` may refer to vinyl acetate content near 10% by mass, while the `130S` segment may correspond to a nominal melt flow index or an internal series code. Because exact specifications vary by production lot, the certificate of analysis and technical data sheet remain the controlling documents for molders and sheet extruders. The compound is used primarily for crosslinked foam sheet, athletic footwear midsoles, gasketing, thermal insulation, and marine buoyancy profiles where a balance of rigidity, cell structure, and heat resistance is required.
Ethylene–vinyl acetate copolymers are classified by melt flow rate and vinyl acetate comonomer content. Vinyl acetate content near 10% by mass produces a semi-crystalline resin with lower polarity and lower flexibility than EVA grades containing 18% to 28% vinyl acetate. The lower comonomer level raises the Vicat softening temperature relative to higher-VA grades and reduces surface tack. In crosslinkable foam compounds, the vinyl acetate group participates in radical-mediated crosslinking, but the density of crosslinks is governed more strongly by peroxide loading and cure temperature than by vinyl acetate content alone. The melt flow rate of the unfoamed compound is typically measured according to ISO 1133-1:2022 at 190 °C under 2.16 kg. Grades with nominal melt flow values in the 1.0–1.5 g/10 min range are common for sheet foam because they provide sufficient melt strength for expansion without excessive backpressure. The `130S` portion of the designation may correlate with a melt flow index in that range, but this interpretation is not universal across suppliers.
Compounding of EVAtech 130S/10 on a production-scale twin-screw extruder with an L/D ratio of 32:1 to 44:1 requires a screw profile with distributive mixing elements rather than severe kneading blocks. Feed-zone barrel temperatures are maintained at 90 °C to 100 °C, and the metering zone is limited to 140 °C to 160 °C. Melt temperature at the die should not exceed 170 °C when azodicarbonamide blowing agent is present in the formulation. Premature gas evolution at higher melt temperatures creates die build-up, surface porosity, and non-uniform cell nucleation. Pre-drying at 70 °C for 3 h is applied when packaging has been exposed to relative humidity above 60%, because moisture accelerates hydrolytic degradation of ester groups and can produce acetic acid odor during processing.
Pre-blending of EVAtech 130S/10 with peroxide, blowing agent, activator, and filler can be performed in a low-speed ribbon blender before extrusion. The peroxide is often added as a liquid or absorbed on a carrier. High-shear mixing of peroxide at temperatures above its decomposition onset can cause premature scorch. In internal mixers, ram pressure and rotor speed are controlled to keep batch temperature below 110 °C until all solid additives are dispersed. Two-roll mills at 90 °C to 110 °C are used for small-scale color matching but are not preferred for production volumes.
The following table summarizes the performance envelope common to this class; it is not a substitute for the supplier’s certificate of analysis. Published data for the EVAtech 130S/10-specific configuration is limited, and the values should be read as class-representative rather than lot-specific.
| Property | Test method | Typical range | Condition / note |
|---|---|---|---|
| Melt flow rate, unfoamed compound | ISO 1133-1:2022 | 1.0–2.0 g/10 min | 190 °C, 2.16 kg; supplier lot-dependent |
| Density after expansion | ISO 1183-1:2019 | 0.15–0.30 g/cm³ | Closed-cell foam; blowing agent loading dependent |
| Hardness, Shore A | ISO 48-4:2018 / ASTM D2240 | 35–55 | After crosslinking and expansion |
| Tensile strength | ISO 37:2017 | 1.0–3.5 MPa | Type 2 dumbbell, 500 mm/min |
| Elongation at break | ISO 37:2017 | 180–400% | Lower values at lower vinyl acetate content |
| Tear strength | ISO 34-1:2022 | 4–10 N/mm | Unnotched specimen |
| Compression set | ISO 815-1:2020 | 35–65% | 22 h at 70 °C, method A |
The ranges are not a product specification; they describe the performance envelope common to this class of crosslinkable EVA foam compound. The supplier’s certificate of analysis must be used for lot acceptance.
Crosslinkable EVA foam compounds rely on simultaneous radical crosslinking and gas evolution. Dicumyl peroxide exhibits a 1 h half-life in the 130 °C to 140 °C range in polymer matrices, while unactivated azodicarbonamide decomposes near 200 °C to 210 °C. The decomposition temperature of azodicarbonamide is reduced to approximately 150 °C to 180 °C by activators such as zinc oxide and zinc stearate. The cure system must be selected so that crosslinking establishes melt strength before the blowing gas expands the cell walls, but not so early that the network restricts bubble growth. Formulation adjustments are typically evaluated on an oscillating disc rheometer or rotorless curemeter according to ISO 6502-2:2018. Minimum torque, maximum torque, scorch time ts2, and optimum cure time t90 provide the kinetic boundary conditions. For EVA foam compounds of this class, ts2 at 170 °C commonly falls between 0.5 min and 1.5 min, and t90 between 5 min and 10 min; these values shift with blowing agent loading and activator package.
Avoid strongly basic amine-based antioxidants in EVAtech 130S/10 formulations because they can interfere with peroxide decomposition and alter the scorch time. Sterically hindered phenolic antioxidants are preferred at low addition levels because they provide thermal stabilization without consuming radical cure efficiency to the same extent. Azodicarbonamide residues may include cyanuric acid and ammonia; ventilation must meet local occupational exposure limits for hydrazodicarbonamide and decomposition by-products.
On continuous foaming lines, melt pressure upstream of the die is a critical control variable. A pressure transducer installed before the gear pump and a second transducer at the die provide differential pressure data. Fluctuations greater than ±0.3 MPa at the die correspond to inconsistent gas nucleation and broadened cell size distribution. The use of a gear pump smooths pressure pulses from the extruder, but only when the melt temperature is stable. Screen pack selection should balance filtration and residence time; a 60/80/100 mesh configuration is common for crosslinkable EVA foam compounds, although the actual configuration depends on contaminant load and die design.
In production-scale extrusion, the relationship between melt pressure stability and cell nucleation is not linear. Small pressure oscillations at the die can produce large differences in foam density because the blowing gas remains dissolved in the melt until the pressure drop at the die lip. A stable pressure profile requires consistent pellet feed, uniform preheating, and controlled screw speed. When melt pressure varies by more than ±0.3 MPa, the cell size distribution widens and the foam surface may show transverse ridges. This condition is sometimes mistaken for formulation error, but it is most often caused by starve-feeding fluctuations or worn screw elements. Replacing a worn mixing section or tightening feed-hopper level control reduces the variation without changing the chemical package.
Thermal degradation of EVA proceeds through deacetylation above 230 °C, releasing acetic acid. Processing must remain below that threshold; prolonged residence time at 180 °C can still shift melt flow rate and produce gel particles. A nitrogen-purged feed hopper is not required but is used when moisture or oxidation sensitivity is observed on long runs. The lower vinyl acetate content of EVAtech 130S/10 reduces the amorphous fraction and increases crystallinity relative to EVA grades with 18% or 28% vinyl acetate. The crystalline regions remain unmelted at typical compounding temperatures, contributing to melt elasticity and foam cell stability, but they also raise the minimum processing temperature for homogeneous additive dispersion.
In comparison with EVA grades containing 18% or 28% vinyl acetate, a 10% vinyl acetate compound yields a harder foam with lower tack and lower low-temperature flexibility. The lower comonomer content reduces compatibility with fillers and polar additives, so formulations may require higher levels of coupling agents or wetting agents when calcium carbonate is used. Against LDPE foam, EVAtech 130S/10 provides lower compression set and better stress-crack resistance under flexural fatigue. Against EPDM foam, the EVA compound offers easier thermoplastic processing before cure but lower continuous heat resistance above 100 °C.
| Polymer class | Vinyl acetate content | Typical expansion density | Compression set tendency | Processing / cure window | Adhesion and tack |
|---|---|---|---|---|---|
| EVAtech 130S/10 class | 10% by mass | 0.15–0.30 g/cm³ | 35–65% after 22 h/70 °C | 90–160 °C compounding; 150–180 °C cure/foam | Low to moderate tack |
| EVA 18–28% grades | 18–28% by mass | 0.10–0.25 g/cm³ | 30–60% after 22 h/70 °C | 80–150 °C compounding; 140–175 °C cure/foam | Higher tack, softer foam |
| LDPE foam | 0% | 0.05–0.20 g/cm³ | 50–80% after 22 h/70 °C | 110–220 °C extrusion; chemical or physical blowing | Low tack, higher stiffness |
| EPDM foam | 0% | 0.25–0.60 g/cm³ | 20–40% after 22 h/70 °C | 70–100 °C mixing; 160–190 °C cure | Low tack, high temperature resistance |
In peroxide-cured EVA foam, expansion ratio and crosslink density are coupled through melt rheology. Increasing peroxide loading raises the elastic modulus and cell wall strength but can reduce final expansion if the network resists bubble growth. Reducing peroxide loading allows lower foam density but promotes cell coalescence and surface tack. Typical azodicarbonamide loadings of 2–6 phr and peroxide loadings of 0.5–1.2 phr are used to produce densities from 0.10 g/cm³ to 0.30 g/cm³. Zinc oxide at 2–4 phr lowers the blowing agent decomposition temperature and contributes to fine cell structure. These ranges require re-optimization for EVAtech 130S/10 because lower vinyl acetate content reduces the solubility of polar blowing agent activators and can produce a denser foam at equal formulation loadings.
Cure curves are influenced by blowing agent decomposition gases: nitrogen, carbon monoxide, carbon dioxide, and ammonia. Cell nucleation occurs at sites of zinc oxide and calcium carbonate. The expansion rate must be balanced with vulcanization rate. If crosslink density increases too rapidly before full gas evolution, internal pressure can remain high and cause post-cure expansion; if too slowly, gas escapes through unstabilized cell walls and foam density increases. This is why the compound is characterized by both moving die rheometer and thermomechanical analysis.
For applications involving food-contact surfaces, EVA copolymers may be evaluated under 21 CFR 177.1350 only when the specific formulation, conversion process, and end-use conditions are approved. RoHS compliance is assessed against Directive 2011/65/EU Annex II for restricted substances, and REACH obligations arise under Regulation (EC) No 1907/2006 Article 33 for substances of very high concern above 0.1% by mass. Blowing agent selection is subject to regulatory drift. Azodicarbonamide decomposes to form semicarbazide in some matrices, and the presence of semicarbazide above measurable thresholds has triggered restrictions in certain food-contact and children’s product jurisdictions. Converters using EVAtech 130S/10 for toy or food-contact applications must verify migration limits under EN 71-3:2019+A1:2021 or Regulation (EU) No 10/2011, as applicable. The supplier’s material disclosures should be reviewed to confirm whether the blowing agent package is appropriate.
Compression molding of EVAtech 130S/10 foam sheet is typically performed in presses with clamp force from 300 t to 500 t, although press size depends on sheet dimensions. Molds are heated to 150 °C to 180 °C. Cure time is determined by part thickness, with a common target of 1.0–1.5 min/mm at the center of the part. Opening the mold before the network has sufficiently cooled causes post-expansion and dimensional instability. Demolding temperatures above 45 °C can produce shrinkage and warpage in thick sections.
