| HS Code | 536291 |
| Product | SINOPEC EVA 14J2 |
| Manufacturer | China Petroleum & Chemical Corporation (Sinopec) |
| Material Type | Ethylene-Vinyl Acetate (EVA) Copolymer |
| Vinyl Acetate Content | 14% |
| Melt Flow Rate 190 C 2 16kg | 2.0 g/10min |
| Density | 0.933 g/cm³ |
| Melting Point | 78°C |
| Vicat Softening Point | 62°C |
| Tensile Strength | 14 MPa |
| Elongation At Break | 650% |
| Shore Hardness | 95 A |
As an accredited SINOPEC EVA 14J2 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SINOPEC EVA 14J2 is packaged in 25 kg multi-walled paper bags, ensuring safe handling, moisture protection, and ease of transport. |
| Container Loading (20′ FCL) | 20′ FCL loading of SINOPEC EVA 14J2: 25kg bags on pallets, about 20 metric tons per container, safe, dry, and well-stowed. |
| Shipping | SINOPEC EVA 14J2 is a non-hazardous ethylene-vinyl acetate copolymer resin. Ship in clean, dry containers or woven polypropylene bags with moisture-proof liners. Avoid prolonged exposure to heat, direct sunlight, and humidity. Store away from ignition sources and strong oxidizers. Handle gently to prevent bag damage; keep sealed before use. |
| Storage | Store SINOPEC EVA 14J2 in a clean, dry, well-ventilated warehouse, away from direct sunlight, rain, heat sources, and open flames. Keep bags sealed and upright, avoiding sharp objects that may puncture packaging. Maintain moderate temperature and low humidity; do not stack excessively high. Keep away from oxidizing agents and strong acids. |
| Shelf Life | Shelf life is typically 12 months when stored in a cool, dry, well-ventilated area away from direct sunlight. |
Closed-cell crosslinked foam for injection-moulded footwear midsoles utilises SINOPEC EVA 14J2 as the 100 phr base resin, with vinyl acetate content at 14% and melt flow rate at 2.0 g/10 min when measured at 190 °C under 2.16 kg load according to ISO 1133-1:2022. The compounding formulation established on production lines combines azodicarbonamide at 2.5–4.0 phr, dicumyl peroxide at 0.6–1.0 phr, zinc oxide at 1.0–2.0 phr, zinc stearate at 0.5–1.0 phr, and precipitated calcium carbonate at 8–15 phr; these are mixed in an internal mixer with drop temperature held at 108–115 °C to prevent premature azodicarbonamide decomposition, followed by sheeting on a two-roll mill at 85–95 °C and strand pelletising. The injection-moulding process operates with barrel zones from 90 °C to 120 °C, a mould temperature of 165–180 °C, injection pressure of 80–120 MPa, and mould vent depth of 0.03–0.05 mm. During mould filling the azodicarbonamide decomposes and dicumyl peroxide crosslinks the EVA matrix; clamping force is calculated from projected area at 0.4–0.6 kN/cm2. Finished foam density is measured according to ISO 845 and controlled between 0.18 g/cm3 and 0.30 g/cm3. Tensile properties of the cellular material are tested according to ASTM D3575-20, while compression set after 50% compression for 22 h at 70 °C is evaluated by ISO 1856:2018, with typical acceptance below 30% for athletic footwear. End products produced from this route include injection-moulded midsoles, wedge soles, and cushioned footbeds for casual and sports footwear. Pre-drying at 70–80 °C for 2–4 h is mandatory when ambient relative humidity exceeds 60%, because absorbed moisture causes surface pitting and irregular cell growth. If compound temperature exceeds 120 °C during pelletising, the azodicarbonamide decomposition peak shifts and foam density can drift upward by 0.02–0.05 g/cm3. EU market requirements under REACH 1907/2006 apply to the crosslinking and blowing agents and their decomposition residues.
In halogen-free flame-retardant cable sheathing, SINOPEC EVA 14J2 is not used as a sole polymer but as a polar co-resin to raise char formation and filler wetting. The polymer phase is prepared by melt blending 25–45 wt% of 14J2 with LDPE or LLDPE; the combined polymer fraction is then loaded with magnesium hydroxide or aluminium trihydrate at 150–180 phr relative to polymer, equal to 60–70 wt% of total compound. The high filler loading is required to achieve limiting oxygen index above 35% when tested by ISO 4589-2:2017. Process difficulty is concentrated in the first compounding stage: because EVA 14J2 has a 2.0 g/10 min MFI and begins to degrade at elevated temperature, twin-screw extrusion is run at a screw speed of 250–320 rpm on a 40:1 L/D intermeshing co-rotating extruder, with barrel temperatures 120–170 °C and die temperature 160–170 °C. A temperature-controlled side feeder is required for filler introduction after the first melting zone; filler added at the main throat can reduce output by more than 20% and generate excessive melt pressure. Melt filtration through 80/120/80 mesh screens protects downstream sheathing. The compound is pelletised by strand or underwater granulation and then dried to below 300 ppm moisture at 75–80 °C for 4–6 h. Sheathing extrusion on a single-screw extruder with L/D 25:1, compression ratio 2.2–2.8:1, and barrel temperatures 130–180 °C must maintain melt pressure at the die below 30 MPa. Compliance is judged against IEC 60332-1-2:2015 for vertical flame propagation, IEC 60754-1:2011 for halogen acid gas below 0.5%, IEC 60754-2:2011 for pH ≥ 4.3 and conductivity ≤ 10 µS/mm, and IEC 61034-2:2005/AMD1:2013 for smoke transmittance ≥ 60%. End products are low-smoke zero-halogen sheathing and insulation for building wire, industrial control cable, and mass transit cabling. This application is incompatible with amine-based flame-retardant additives, which can catalyse ester hydrolysis of the vinyl acetate units and reduce surface smoothness.
| Test | Method | Typical criterion |
|---|---|---|
| Vertical flame spread | IEC 60332-1-2:2015 | Char height ≤ 425 mm |
| Halogen acid gas emission | IEC 60754-1:2011 | ≤ 0.5% |
| Gas pH | IEC 60754-2:2011 | ≥ 4.3 |
| Gas conductivity | IEC 60754-2:2011 | ≤ 10 µS/mm |
| Smoke density | IEC 61034-2:2005/AMD1:2013 | Transmittance ≥ 60% |
Polyolefin masterbatch manufacturing for film, blow moulding, and injection moulding uses SINOPEC EVA 14J2 as a carrier resin when the letdown target is a low-melt-index polyethylene or EVA compound. The carrier loading is 60–85 wt% in the masterbatch concentrate, with active pigment or additive at 15–40 wt% and process stabiliser at 0.5–2.0 wt%; the concentrate is typically diluted at 2–5 phr in the final formulation. Melt flow rate of the carrier is checked by ISO 1133-1:2022 at 190 °C and 2.16 kg. Pigment dispersion is assessed by ISO 18553:2002 on compression-moulded plaques before the concentrate is released. The process sequence involves high-speed premixing at 500–900 rpm for 3–5 min, extrusion on a 40:1 L/D co-rotating twin-screw extruder with barrel temperatures 100–160 °C, screw speed 300–400 rpm, die-head pressure 4–8 MPa, strand cooling in water at 40–60 °C, and strand pelletising. Final pellet length is usually 2.5–3.5 mm and bulk density 0.55–0.65 g/cm3. End products include colour masterbatches, flame-retardant masterbatches for PE/EVA sheet and cable compounds, and additive masterbatches for antistatic or slip control in cast film. One operational boundary is that 14J2 carrier concentrates can phase-separate if let down into polypropylene above 30 phr; such use requires compatibility testing. Regulatory compliance for packaging applications follows REACH 1907/2006 and the food-contact requirements of the final package, not the masterbatch alone.
Sheet foam production based on SINOPEC EVA 14J2 uses a calendering and compression-moulding sequence rather than injection moulding. The formulation starts with 14J2 at 100 phr, azodicarbonamide at 2.2–3.5 phr, dicumyl peroxide at 0.7–1.2 phr, zinc oxide at 1.0–1.5 phr, zinc stearate at 0.5–1.5 phr, and talc or calcium carbonate at 10–20 phr to widen processing latitude. Mixing occurs in an internal mixer with drop temperature 105–112 °C, followed by an open two-roll mill at 80–90 °C; the sheet preform is then calendered to a thickness of 1.5–4.0 mm before compression moulding. The press cure is performed at 170–180 °C under 8–15 MPa for 10–20 min depending on sheet thickness. After crosslinking and blowing, the platen is cooled to 50 °C before pressure release to prevent post-expansion and curling. Foam density is measured by ISO 845 and typically ranges from 0.15 g/cm3 to 0.40 g/cm3. Tensile properties are tested by ISO 1798:2008, and compression set by ISO 1856:2018 at 50% deflection for 22 h at 70 °C; acceptance for orthotic products is normally below 20%. End products are closed-cell sheet for orthopedic insoles, sports matting, anti-fatigue mats, and low-load gasket sheeting. The operational limitation is sheet thickness: at thickness above 12 mm the temperature gradient across the preform can produce an overcured skin and an undercured core. Published data for that specific configuration in 14J2 is limited, and a cure-rate modifier would need to be validated before production.
Extruded and coextruded packaging structures use SINOPEC EVA 14J2 as a sealant-layer modifier in LDPE and LLDPE blends. The addition ratio is 10–30 wt% of the sealant layer, with the balance LDPE or LLDPE; the vinyl acetate content lowers seal initiation temperature relative to pure LDPE by 5–15 °C, as measured by ASTM F2029-16. Blown film processing for a three-layer line uses a die gap of 1.8–2.5 mm, blow-up ratio 2.0–2.8:1, melt temperature 180–215 °C, and frost line height adjusted to stabilise the bubble. Cast film processing with chill roll at 15–25 °C is preferred when higher seal strength and fewer die lines are required. Seal strength is tested by ASTM F88/F88M-21, and film impact toughness by ASTM D1709-15a. Food-contact compliance for ethylene-vinyl acetate copolymers is evaluated under FDA 21 CFR 177.1350 and EU 10/2011, with migration limits specific to the package geometry and food simulant. End products are vertical form-fill-seal packages for frozen vegetables, frozen prepared foods, and industrial parts; structures are not assigned to retort or boil-in-bag service unless heat-seal creep is explicitly tested above 70 °C. Because EVA seal layers can block at elevated ambient temperatures, a coefficient-of-friction control additive is typically included at 0.1–0.3 wt%; this addition must not interfere with ASTM F88/F88M-21 seal strength.
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SINOPEC EVA 14J2 is an ethylene-vinyl acetate random copolymer whose designation aligns with a nominal vinyl acetate content of 14 wt% and a melt mass-flow rate near 2.0 g/10 min when measured at 190 °C under a 2.16 kg piston load according to ISO 1133-1:2022. The polymer is produced by high-pressure free-radical copolymerization, a process that inserts acetate side groups along the polyethylene backbone and interrupts chain-folded crystallinity. Lot-specific Sinopec certificates of analysis remain the controlling specification for a given production campaign; the ranges presented below are characteristic engineering envelopes for the 14 wt% VA and 2.0 g/10 min MFR class and are not a substitute for a certificate of analysis.
The molecular consequence of the 14 wt% vinyl acetate insertion is a reduction in orthorhombic polyethylene crystallinity to approximately 20–30% after moderate cooling, compared with 40–60% for many LDPE homopolymer grades. This structural change lowers flexural modulus into the 60–90 MPa interval under ASTM D790-17, places Shore A hardness at 88–94 under ASTM D2240-15, and brings the Vicat softening temperature to 70–80 °C under ASTM D1525-17e1. The crystallinity reduction also contributes to greater low-temperature flexibility and higher optical clarity than homopolymer polyethylene.
Because the comonomer distribution is random, the melting endotherm observed by differential scanning calorimetry is broad. A second-heat scan at 10 °C/min typically produces a peak between 85 °C and 95 °C, with endotherm onset around 70 °C; the corresponding crystallization exotherm on cooling appears between 60 °C and 80 °C. The glass-transition region, measured by dynamic mechanical analysis at 1 Hz under ISO 6721-7, commonly falls between -35 °C and -20 °C. These thermal transitions place the grade below LDPE processing temperatures and above high-VA hot-melt adhesive grades in both melting range and melt crystallization rate.
| Property | Characteristic range | Test method |
|---|---|---|
| Vinyl acetate content | 13.5–14.5 wt% | ISO 8985 or calibrated FTIR |
| Melt mass-flow rate | 1.8–2.2 g/10 min at 190 °C/2.16 kg | ISO 1133-1:2022 / ASTM D1238-20 |
| Density | 0.930–0.935 g/cm³ at 23 °C | ASTM D792-20 / ISO 1183-1:2019 |
| Tensile stress at break | 14–20 MPa, Type IV specimen, 500 mm/min | ASTM D638-14 |
| Tensile elongation at break | 700–900% | ASTM D638-14 |
| Shore hardness | 88–94 Shore A / 32–38 Shore D, 15 s delay | ASTM D2240-15 |
| Vicat softening temperature | 70–80 °C, 10 N, 50 °C/h | ASTM D1525-17e1 / ISO 306:2022 |
| Melting peak temperature | 85–95 °C, 10 °C/min second heat | ASTM D3418-15 / ISO 11357-3:2018 |
The melt mass-flow rate should be measured on dried granulate. Moisture above 0.05 wt% can generate splay in injection-molded parts and create local viscosity depression from surface moisture hydrolysis. When bags have been stored at relative humidity above 60%, drying for 2–4 h at 60–70 °C in a desiccant dryer with a dew point below -20 °C is standard practice. Drying should not exceed 80 °C, because pellet surface tack can develop and bridge the feed throat.
At the machine level, a reciprocating injection screw with diameter 40 mm and L/D 20:1 processes the material with barrel set-points from feed to nozzle of 120 °C, 140 °C, 160 °C, and 175 °C. Nozzle melt temperature measured by needle thermocouple should be maintained between 170 °C and 200 °C; residence time above 200 °C should remain below 5 min to limit acetic acid generation from deacetylation. Unplated mold surfaces are susceptible to acid corrosion when venting is insufficient, so chromium-plated or stainless tool steel is preferred for continuous runs exceeding 100,000 cycles.
Multicavity footwear sole tools with clamp force 180–250 t require a minimum screw cushion of 3 mm; below this cushion, shot-to-shot reproducibility deteriorates and short shots appear preferentially in narrow toe cavities. Fill-to-pack switch by screw position is more stable than timer-based switch because the relatively low melt viscosity permits rapid pressure transmission and can mask a timer setting under fluctuating nozzle pressure. Mold temperatures of 25–45 °C balance surface replication against warpage in thick sections.
In single-screw profile extrusion using a 28:1 L/D barrier screw, barrel set-points from 130 °C to 165 °C and a die temperature of 160 °C are typical. The relatively high melt strength of the 2.0 g/10 min MFR grade helps maintain profile shape after the die, while the vinyl acetate content contributes surface gloss and low-temperature flex. Draw-down should be limited to 2:1 to 3:1 to avoid melt fracture.
Compounding operations for filled or masterbatch formulations commonly use a co-rotating twin-screw extruder with L/D 40–48:1 and screw speeds of 250–500 min⁻¹. Calcium carbonate at 20–40 phr disperses acceptably when a distributive mixing section is located before the vacuum devolatilization zone. Batch-to-batch MFR variation for the class is typically controlled within ±0.2 g/10 min, but formulation adjustments in blowing agent and peroxide are required if the certificate of analysis approaches the lower or upper MFR boundary, because gas retention and cell size respond directly to melt viscosity.
In crosslinked EVA foam for midsoles and outsole components, the resin is often compounded in a kneader or twin-screw extruder with azodicarbonamide blowing agent at 2.5–4.5 phr, dicumyl peroxide at 0.5–1.2 phr, zinc oxide at 1.0–2.0 phr, zinc stearate at 0.5–1.0 phr, and calcium carbonate at 10–30 phr. The compound is then press-cured at 150–165 °C for 6–10 min to crosslink the matrix and initiate gas evolution; subsequent expansion at 70–100 °C produces a closed-cell foam with density 0.15–0.25 g/cm³ depending on blowing agent loading and expansion time. Surface pitting and gas release marks in thick sections have been observed when mold temperature is raised above 50 °C without reducing blowing agent loading, because gas evolution outpaces melt solidification.
Against a 9 wt% VA grade at equivalent MFR, EVA 14J2 lowers Vicat softening by 8–12 K under ASTM D1525-17e1 and reduces Shore A hardness by 2–5 points under ASTM D2240-15. The same shift reduces flexural modulus by 20–40 MPa under ASTM D790-17, which lowers resistance to bending strain. Against an 18 wt% VA grade, EVA 14J2 exhibits higher Shore A hardness by 4–10 points and lower room-temperature blocking in stacked parts, but it also shows less adhesive tack to polar substrates.
| VA content | Melting peak range | Shore A hardness range | Flexural modulus range | Primary application class |
|---|---|---|---|---|
| 5–9 wt% | 95–105 °C | 92–97 | 90–150 MPa | Blown film, extrusion coating, heat-seal layers |
| 13.5–14.5 wt% | 85–95 °C | 88–94 | 60–90 MPa | Injection foam, profiles, compounding |
| 18–20 wt% | 78–88 °C | 80–88 | 35–60 MPa | Foam, adhesive modification, compatibilisation |
| 28–33 wt% | 62–75 °C | 65–80 | 15–35 MPa | Hot-melt adhesives, oil-resistant compounds |
The comparative positions in Table 2 are class-level trends assembled from public EVA product literature and should not be interpreted as certificate limits for SINOPEC EVA 14J2. The principal difference from low-VA grades is lower crystalline modulus and lower heat deflection, while the principal difference from high-VA grades is higher stiffness, lower tack, and reduced solubility in hydrocarbon wax and tackifier systems.
Hot-melt adhesive formulations generally require 18–33 wt% VA for sufficient solubility in aliphatic and aromatic-free tackifier systems. SINOPEC EVA 14J2 is not a direct substitute for a 28 wt% VA hot-melt grade because its lower acetate content reduces polarity and may limit open time and adhesion to coated paperboard. Where a harder hot-melt component is needed, it can be used as a viscosity-modifying blend partner, but compatibility with the tackifier and wax package must be confirmed by melt-phase clarity testing.
For outdoor profiles, the acetate segment is vulnerable to photo-oxidative deacetylation. A stabilizer package containing a hindered amine light stabilizer at 0.2–0.5 phr and a UV absorber at 0.1–0.3 phr is used, and accelerated weathering under ASTM G155-21 with a UVA-340 lamp can reveal surface microcracking after 500–1000 h if stabilizers are omitted. Long-term load-bearing at temperatures above 60 °C should be evaluated for creep and compression set under ASTM D395-18, because the lower crystalline fraction reduces high-temperature dimensional stability relative to reinforced polyolefins. Compatibility with processing additives should be confirmed; amine-based antistatic additives have been associated with yellowing in EVA compounds at melt temperatures above 180 °C. RoHS compliance of the final article is not solely polymer-dependent; a product-specific declaration under EU RoHS 2011/65/EU and REACH EC 1907/2006 Annex XVII should be obtained for the finished compound or article.
