| HS Code | 358407 |
| Product | SINOPEC EVA 19F16 |
| Vinyl Acetate Content | 19% |
| Melt Flow Rate 190 C 2 16kg | 16 g/10min |
| Density | 0.94 g/cm3 |
| Tensile Strength | 18 MPa |
| Elongation At Break | 750% |
| Hardness Shore A | 92 |
| Vicat Softening Temperature | 68°C |
| Melting Point | 89°C |
| Brittleness Temperature | -70°C |
As an accredited SINOPEC EVA 19F16 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SINOPEC EVA 19F16 is packaged in 25 kg polyethylene-lined woven bags, palletized and shrink-wrapped for secure transport and storage. |
| Container Loading (20′ FCL) | SINOPEC EVA 19F16 loaded in 20′ FCL on shrink-wrapped pallets, ventilated, and securely lashed to prevent shifting. |
| Shipping | SINOPEC EVA 19F16 is shipped as thermoplastic resin pellets in moisture-proof woven bags or bulk packaging. Use ventilated, clean containers to prevent contamination. Keep away from heat, open flames, and direct sunlight. Store in a cool, dry area with proper ventilation to maintain product quality during transit. |
| Storage | Store SINOPEC EVA 19F16 in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep the original packaging sealed to prevent moisture absorption and contamination. Avoid contact with oxidizing agents. Maintain moderate temperatures, ideally below 30°C. Use proper handling to prevent dust accumulation. Keep containers closed when not in use. |
| Shelf Life | Shelf life is typically two years from production date when stored in a cool, dry, well-ventilated area, away from sunlight and moisture. |
SINOPEC EVA 19F16, with a nominal vinyl acetate content of 19% and a melt flow rate of 1.6 g/10 min (ISO 1133-1:2022, 190°C/2.16 kg), is formulated for compression-molded midsole foam by balancing dicumyl peroxide crosslinking against azodicarbonamide gas-release kinetics. In commercial midsole production, the compound uses EVA 19F16 at 100 phr, dicumyl peroxide at 0.7–1.0 phr, azodicarbonamide at 2.5–4.5 phr, zinc oxide at 1.5–3.0 phr, stearic acid at 0.5–1.0 phr, and ground calcium carbonate at 5–15 phr; the zinc oxide/stearic acid combination shifts the active decomposition interval of azodicarbonamide to approximately 155–165°C, keeping it within the dicumyl peroxide half-life window of 60 s at 171°C. The cure window is held at 170–175°C: below 165°C the dicumyl peroxide half-life exceeds 2 min, so a 10 min cure leaves measurable residual peroxide and undercured cell walls; above 180°C the nitrogen evolution rate surpasses crosslink formation and surface cell collapse occurs. Production-scale internal mixers of 75 L capacity discharge at 105°C in 8–12 min, followed by a two-roll mill at 90–100°C with a friction ratio of 1.2:1 and nip gap 2–4 mm, then compression molding at 12–15 MPa for 8–10 min. Under EU REACH 1907/2006, residual semicarbazide from azodicarbonamide decomposition must be controlled at the workplace during compounding, and azodicarbonamide is classified as Resp. Sens. 1 H334 under CLP 1272/2008; exported midsoles are screened against REACH Annex XVII entry 43 for aromatic amines in azo colorants when colored masterbatch is present. Amine-based antioxidants are incompatible with dicumyl peroxide-cured EVA foam because aromatic amines quench peroxy radicals and can reduce gel content by 10–15 percentage points, producing open-cell-like collapse in the middle of the midsole. Physical requirements for the expanded product are typically verified by ASTM D3574-17 density and compression set tests and ISO 20872:2018 for adhesion. Terminal finished parts produced from this formulation include running shoe midsoles, sandal soles, recovery sandals, insoles, and sport shoe midsole boards.
In halogen-free flame-retardant cable jacketing, EVA 19F16 is extended with mineral fillers until the compound reaches the limiting oxygen index required for vertical flame spread tests, but the addition ratio is bounded by melt-pressure excursions on co-rotating twin-screw compounding lines. A typical base compound contains 60–80 phr EVA 19F16 and 20–40 phr linear low-density polyethylene, with magnesium hydroxide at 120–160 phr or aluminum hydroxide at 140–180 phr, vinyl silane coupling agent at 1.0–2.0 phr, antioxidant at 0.5–1.0 phr, and zinc stearate processing aid at 1.0–3.0 phr. Below 120 phr Mg(OH)₂, the limit oxygen index tends to fall below 35% as measured by ASTM D2863-19; above 160 phr, strand die melt pressure on a 36:1 L/D extruder commonly exceeds 20 MPa and causes surface melt fracture, poor pellet definition, and die lip build-up. The filler is hygroscopic: when storage relative humidity exceeds 60%, pre-drying at 80°C for 2–4 h or vented twin-screw vacuum below −0.08 MPa is required to prevent jacket pin-holes. Compliance for the finished cable compound is evaluated against IEC 60332-1-2 for vertical flame spread, IEC 60754-2 for halogen acid gas emission, IEC 61034-2 for smoke density, and EN 50363-1 for LSZH sheathing compound; the end article further falls under RoHS Directive 2011/65/EU for lead, cadmium, mercury, hexavalent chromium, PBB, and PBDE. Downstream processing uses a co-rotating twin-screw extruder with 36:1 L/D, temperature profile 130/140/150/155/160°C, screw speed 250–350 rpm, and a crosshead cable extrusion line with water trough cooling; jacket thickness in building wire ranges from 0.8 mm to 2.0 mm. Terminal finished product types include LSZH outer sheaths for building wire, control cables, shipboard cables, and data center power cables.
| Performance property | Test standard | Typical acceptance |
|---|---|---|
| Limit oxygen index | ASTM D2863-19 | ≥ 35% |
| Vertical flame spread | IEC 60332-1-2 | Pass |
| Halogen acid gas emission | IEC 60754-2 | ≤ 0.5% |
| Smoke density | IEC 61034-2 | Transmittance ≥ 60% |
Carrier resins based on EVA 19F16 are used for color masterbatches and processing-aid masterbatches where high pigment wetting and a melting point below polyolefin processing temperatures are required. The formulation uses EVA 19F16 at 60–80 wt%, organic or inorganic colorant at 20–40 wt%, microcrystalline wax or paraffin wax at 2–6 wt%, and hindered phenolic antioxidant at 0.1–0.3 wt%; the vinyl acetate content of 19% increases dipole compatibility with polar organic pigments compared with LDPE, while the melt flow rate of 1.6 g/10 min keeps the strand from swelling. In production, a co-rotating twin-screw extruder with 30:1 L/D, screw speed 300–450 rpm, and barrel temperature 140–165°C is used; dispersive mixing blocks with 45° kneading angles reduce pigment agglomerates to below 5 µm when the pressure drop across the screen changer is maintained below 8 MPa. Compliance depends on the final article rather than the carrier: when the masterbatch is used in food-contact polyolefin packaging, the final article must satisfy Commission Regulation (EU) No 10/2011 and FDA 21 CFR 175.105, but EVA 19F16 alone does not confer food-contact approval. Downstream production terminates in water-ring pelletizing to produce cylindrical granules of 2.0–3.0 mm diameter and 2.5–3.5 mm length. Terminal finished product types include color masterbatch granules for blown film, additive masterbatch pellets for injection molding, and filler masterbatch for extrusion coating.
Continuous chemical foaming of crosslinked EVA sheet using 19F16 is operated at lower specific energy than midsole molding because the sheet line relies on the oven rather than the press for expansion and crosslinking. The compound uses EVA 19F16 at 100 phr, azodicarbonamide at 2.0–4.0 phr, dicumyl peroxide at 0.5–0.8 phr, zinc oxide at 1.2–2.5 phr, and zinc stearate at 1.0–1.5 phr; when the sheet is intended for children’s play mats, the formulation must satisfy EU Toy Safety Directive 2009/48/EC and EN 71-3:2019+A1:2021 migration limits for elements, as well as REACH Annex XVII phthalate restrictions in accessible plasticized material. The downstream process uses an internal mixer at 80–90°C to prevent premature gas release, a cooling two-roll mill, and a single-screw extruder with 28:1 L/D fitted with a flat slot die; the extrudate enters a continuous foaming oven at 200–230°C where the sheet expands to 3–8 mm thickness depending on line speed. Published data for this specific grade in continuous chemical foaming with electron beam crosslinking is limited; plant-scale settings are therefore derived from pilot trials on similar EVA grades with 18–20% vinyl acetate. Terminal finished product types include interlocking floor mats, gym mats, yoga blocks, protective padding, and packaging inserts.
In thermoformed EVA padding for automotive interiors, the target is not maximum expansion ratio but low volatile emissions after the blowing system has decomposed. The formulation loads EVA 19F16 at 100 phr, azodicarbonamide at 3.0–5.0 phr, dicumyl peroxide at 0.6–1.0 phr, triallyl cyanurate at 0.3–0.8 phr, zinc oxide at 1.5–2.5 phr, and activated carbon at 0.5–1.0 phr where odor control is specified. Emission compliance is verified by VDA 278:2011 thermodesorption analysis for VOC and FOG values, VDA 270 odor rating, and FMVSS 302 horizontal burn rate below 100 mm/min; the material must also meet REACH Annex XVII restrictions for residual azodicarbonamide decomposition products and the vehicle manufacturer’s specific list of prohibited SVHCs. Production starts with internal mixing at 85–95°C, followed by calendering into sheet at 90–110°C, compression molding at 165–175°C for 6–10 min, thermoforming at 130–150°C, and die-cutting. The process limitation is that the sheet must be aged for 48–72 h at 40–50°C before thermoforming to allow post-foaming gas exchange and to prevent blistering during secondary forming. Terminal finished product types include headliner backing foam, door bolster padding, crash pad support strips, and HVAC seal gaskets.
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Ethylene-vinyl acetate copolymer grade SINOPEC EVA 19F16 is a random copolymer produced in a high-pressure polyethylene process. The grade designation is read in industrial material-selection practice as a nominal vinyl acetate comonomer content of 19 wt% and a nominal melt mass-flow rate of 1.6 g/10 min at 190 °C under a 2.16 kg load. This positions the resin between low-VA grades such as 14 wt% EVA and high-VA grades such as 28 wt% EVA, with a balance of low-temperature flexibility, polar filler wetting, and retention of polyethylene-like processability. Published data for this exact SINOPEC grade is limited; the specification ranges below are representative industrial values for EVA with a 19 wt% VA content and a melt index near 1.6 g/10 min. The manufacturer certificate of analysis remains the governing reference for lot-specific properties.
Melt mass-flow rate is determined according to ISO 1133-1:2022 procedure A; a typical control range is 1.4–1.8 g/10 min. Density determined by ISO 1183-1:2019 is typically 0.938–0.943 g/cm³. Thermal analysis under ISO 11357-3:2018 shows a broad melting endotherm with a peak near 84 °C and a crystallization exotherm near 71 °C; the exact peak depends on short-chain branching distribution and thermal history. Tensile stress at break under ISO 527-2 at 50 mm/min generally falls in the range 15–20 MPa, with elongation at break from 600% to 800%. Hardness by ISO 868 is commonly 36–40 Shore D for the 19 wt% VA class, while Vicat softening temperature under ISO 306/A50 is typically 55–65 °C. These values differ from LDPE homopolymer in the direction of lower crystallinity, lower melting point, higher elongation, and increased resistance to environmental stress cracking.
Compared with an LDPE homopolymer, the 19 wt% vinyl acetate units reduce crystallinity and lower the melting point by approximately 25–30 °C. The acetate group also increases the critical surface tension of the resin and permits higher filler loadings than LDPE and lower-VA EVA. The polymer remains thermally processable on conventional polyolefin equipment, but the practical upper melt-temperature limit is lower because vinyl acetate units undergo thermal deacetylation at elevated temperatures.
On compounding lines using co-rotating twin-screw extruders with L/D ratios of 40:1 to 48:1, SINOPEC EVA 19F16 accepts calcium carbonate loadings of 20–40 wt% without severe torque spikes when barrel temperatures are staged from 140 °C in the feed section to 180 °C at the die. Plant-scale experience indicates that the practical processing window narrows when azodicarbonamide is used as a blowing agent, because gas evolution becomes significant above 190 °C and uncontrolled decomposition occurs above 220 °C. Maintaining melt temperature within ±5 °C of the decomposition plateau is required on twin-screw foam lines to avoid open-cell collapse or skin scorching. Single-screw extruders with screw L/D ratios from 32:1 to 36:1 are used for profile foam; in such operations, barrier screws with low-shear dispersive mixing elements are preferred because excessive viscous heating raises melt temperature and initiates premature blowing-agent decomposition. Pre-drying at 60–70 °C for 4 h is recommended when storage at relative humidity above 60% has occurred, to prevent surface defects in extruded profiles.
Capillary rheometry of 19 wt% VA EVA with a melt index near 1.6 g/10 min typically shows shear-thinning behavior. At 190 °C, apparent viscosity is commonly in the range of 150–350 Pa·s at 1000 s⁻¹ and 600–1200 Pa·s at 100 s⁻¹. Die swell is lower than LDPE of equivalent melt mass-flow rate, which improves profile dimensional stability but can reduce melt strength in blown film. In extrusion coating, melt draw resonance may appear at draw ratios above 30:1 unless the die temperature is held below 185 °C.
The vinyl acetate comonomer disrupts ethylene crystallinity, lowering room-temperature stiffness and shifting the ductile-to-brittle transition to lower temperatures. Comparative mechanical data for EVA families shows that a change from 14 wt% to 19 wt% VA reduces flexural modulus and increases notched impact toughness under ISO 180, while a change from 19 wt% to 28 wt% VA further increases elongation and surface tack but reduces heat resistance. In adhesive and compounding applications, the acetate group increases the solubility parameter and improves wetting of calcium carbonate, magnesium hydroxide, and cellulosic fillers. For extrusion lamination, adhesion to aluminium foil and polyamide film is stronger than with 14 wt% VA and LDPE, but lower than with 28 wt% VA.
| Property | Test method | EVA 19F16 class | EVA 14 wt% class | EVA 28 wt% class |
|---|---|---|---|---|
| Nominal vinyl acetate content | FTIR or internal | 19 wt% | 14 wt% | 28 wt% |
| Melt mass-flow rate | ISO 1133-1:2022 | 1.4–1.8 g/10 min | 2–3 g/10 min | 3–5 g/10 min |
| Density | ISO 1183-1:2019 | 0.938–0.943 g/cm³ | 0.930–0.935 g/cm³ | 0.950–0.955 g/cm³ |
| Peak melting endotherm | ISO 11357-3:2018 | 84 °C | 90–95 °C | 70–75 °C |
| Tensile stress at break | ISO 527-2 | 15–20 MPa | 18–22 MPa | 10–15 MPa |
| Elongation at break | ISO 527-2 | 600–800% | 650–850% | 750–1000% |
| Hardness | ISO 868 | 36–40 Shore D | 42–48 Shore D | 28–33 Shore D |
| Vicat softening temperature | ISO 306/A50 | 55–65 °C | 70–78 °C | 45–55 °C |
The table values are representative industrial ranges for EVA classes, not lot-specific certificate values for SINOPEC EVA 19F16. Grade transitions show that increasing VA content reduces crystallinity and hardness while improving filler acceptance and low-temperature flexibility. The same structural change lowers continuous-use temperature limits and increases surface tack, which can require anti-block additions in film and sheet.
Material compliance is formulation-specific and requires confirmation against the supplier’s product stewardship declaration. For food-contact applications in the United States, ethylene-vinyl acetate copolymers are referenced by 21 CFR 177.1350, with additive limitations governed by the authorisation status of each individual compounding ingredient. In the European Union, compliance with Regulation (EU) No 10/2011 requires verification of overall migration under food simulants A, B, and D2, with an overall migration limit of 10 mg/dm² for general food-contact articles. For toy and consumer goods applications, EN 71-3 migration limits apply. The product can be assessed under RoHS Directive 2011/65/EU and REACH SVHC obligations; lot-level declarations should be requested for cadmium, lead, mercury, hexavalent chromium, PBBs, and PBDEs below the RoHS concentration limits of 0.1 wt% for homogeneous material and 0.01 wt% for cadmium.
The following matrix summarises the standard designations and typical verification parameters for regulatory and specification compliance. Because EVA formulations vary with additive packages, the matrix should be used as a checklist rather than a declaration of unconditional conformity.
| Requirement | Relevant document or method | Typical verification parameter |
|---|---|---|
| US food-contact resin status | 21 CFR 177.1350 | Formulation-specific additive review |
| EU food-contact overall migration | Regulation (EU) No 10/2011 | 10 mg/dm² overall migration limit |
| RoHS restricted substances | 2011/65/EU | 0.1 wt% Pb, Hg, Cr6+, PBB, PBDE; 0.01 wt% Cd |
| REACH SVHC screening | EC 1907/2006 | Supplier SVHC declaration |
| Toy element migration | EN 71-3 | Element-specific migration limits by material category |
| Melt mass-flow rate verification | ISO 1133-1:2022 | 1.4–1.8 g/10 min |
| Density verification | ISO 1183-1:2019 | 0.938–0.943 g/cm³ |
Substituting SINOPEC EVA 19F16 into an existing LDPE or EVA 14 wt% process requires adjustment of barrel temperature set-points and screw speed because the higher vinyl acetate content lowers melt viscosity and melt temperature. In injection molding of foam footwear components, mold clamp force is commonly maintained at 120–180 t for multicavity runners, with melt temperature held between 165 °C and 180 °C and injection speed reduced to avoid jetting and blistering. Cycle time is influenced more by mold temperature control, typically 35–50 °C, than by material flow. Plant-scale runs have shown that purging with a lower-melt-index LDPE after shutdown prevents vinyl acetate degradation deposits on screw and barrel surfaces. Operators should avoid barrel residence times above 20 min at melt temperatures above 180 °C because thermal deacetylation can generate acetic acid and cause corrosion on unplated screw surfaces.
In footwear midsole injection molding, final foam density is frequently controlled in the range 0.15–0.25 g/cm³, with compression set under ASTM D395-18 Method B typically below 35% after 22 h at 50 °C when the blowing agent and crosslinking system are optimised. Such performance requires balancing EVA molecular weight, VA content, and dicumyl peroxide level to achieve adequate crosslink density without excessive chain scission. In high-filler masterbatch compounding, the resin is used as a carrier at let-down ratios of 10:1 to 20:1 with calcium carbonate or antimony trioxide, where the acetate group improves pigment wetting relative to LDPE and lower-VA EVA.
