| HS Code | 875946 |
| Density | 0.927 g/cm³ |
| Melt Flow Rate | 2.0 g/10min (190°C/2.16kg) |
| Va Content | 9.0 wt% |
| Melting Point | 94 °C |
| Vicat Softening Point | 72 °C |
| Tensile Strength | 22 MPa |
| Elongation At Break | 650% |
| Shore Hardness | 40 D |
| Brittleness Temperature | -70 °C |
| Heat Seal Initiation Temperature | 90 °C |
As an accredited SINOPEC EVA 9F2 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SINOPEC EVA 9F2 is packaged in 25 kg polyethylene-lined kraft bags, palletized and stretch-wrapped for safe transport. |
| Container Loading (20′ FCL) | 20′ FCL container loading of SINOPEC EVA 9F2: palletized bags, secured with straps, ventilated, labeled, and customs-compliant for safe transport. |
| Shipping | SINOPEC EVA 9F2 is a non-hazardous thermoplastic resin supplied as solid pellets. It ships safely in multi-wall paper bags, jumbo bags, or bulk containers. Protect from moisture, excessive heat, and direct sunlight during transit. Keep packaging intact, store in a dry, ventilated area, and avoid exposure to oxidizing agents. |
| Storage | Store SINOPEC EVA 9F2 in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and open flames. Keep containers sealed to prevent moisture absorption and contamination. Maintain moderate temperatures, avoid stacking excessively, and protect from mechanical damage. Follow local regulations to ensure safe handling and stability. |
| Shelf Life | Shelf life is typically two years if stored in a cool, dry, well-ventilated area away from direct sunlight and moisture. |
Sinopec EVA 9F2 is a low-vinyl-acetate ethylene-vinyl acetate copolymer. The vinyl acetate content is typically 9 wt% determined by infrared spectroscopy according to ASTM D5594-18a, and the melt flow rate is 2 g/10 min at 190 °C under 2.16 kg load per ISO 1133-1:2022. Density at 23 °C is 0.927 g/cm³ per ISO 1183-1:2019. These values define a processing profile closer to LDPE than to hot-melt or solar-encapsulant grades, but the short-chain branching introduced by the acetate side group raises environmental stress crack resistance, low-temperature flexibility, and sealability compared with LDPE of similar melt flow rate. The following application scenarios are separated by actual downstream processing route rather than generic sector headings.
Extrusion lamination of aluminium foil to a polyolefin sealant web is one route where EVA 9F2 can replace a standard LDPE sealing layer without changing the laminator configuration. In this route, a monolayer or coextruded web is melt-exited from a 90 mm 30D single-screw extruder through a 2400 mm internal-deckle die onto 7–12 μm aluminium foil; the melt temperature is held at 215–235 °C and the air gap between die exit and nip is set at 120–180 mm. Neck-in measured at the chill-roll edge increases from 28 mm per side at 215 °C and 160 mm air gap to 52 mm per side at 235 °C and 180 mm air gap. The sealant layer is processed neat or blended with LDPE at 20–50 wt% LDPE; increasing LDPE above 50 wt% raises seal initiation temperature and reduces foil adhesion. Because the 9 wt% VA content provides only moderate polarity, adhesion to aluminium foil depends on in-line corona treatment of the foil at 2.5–3.5 kW or the use of a primer between the foil and the EVA melt. Peel strength by ASTM F904-16 on 15 mm strips typically falls between 2.5 N/15 mm and 4.5 N/15 mm with a primer and 0.8–1.2 N/15 mm without primer. The seal initiation temperature of a 40 μm EVA 9F2 sealant layer is 95–105 °C, lower than a comparable LDPE layer at 115–125 °C, which permits faster jaw speeds on vertical form-fill-seal machinery. Thermal stability imposes the main boundary: at melt temperatures above 240 °C, acetate decomposition releases acetic acid, which can create odour in fatty foods and corrode chill-roll surfaces; residence time at 235 °C should not exceed 30 min. For food contact structures, the layer is assessed under FDA 21 CFR 177.1350 and European Commission Regulation (EU) No 10/2011. This route is used for dry-food sachets, non-retort pouch structures, and peelable lid webs.
In low-voltage cable bedding, EVA 9F2 is used as the base resin in a moisture-crosslinkable compound. The compound is produced on a co-rotating twin-screw extruder with L/D 44 and barrel temperatures rising from 160 °C at the feed throat to 190 °C at the die. Vinyltrimethoxysilane is grafted onto the polyethylene backbone using dicumyl peroxide as initiator. Typical dosing is 1.5–2.0 wt% silane and 0.08–0.12 wt% peroxide; below 1.2 wt% silane the final hot set elongation after moisture cure exceeds 175% under 0.2 MPa load at 200 °C, as referenced in IEC 60811-507, and above 2.5 wt% silane the excess monomer volatilises and creates die-lip build-up. The compounding formulation includes aluminium trihydrate at 80–120 phr for flame retardancy, an organotin condensation catalyst at 0.05–0.10 phr, and a hindered phenolic antioxidant at 0.3–0.5 phr. Primary or secondary amine-based co-stabilisers are avoided because they interact with the tin catalyst and raise yellowing during the 80 °C water-bath cure step. After extrusion onto the cable core, the bedding layer is moisture-cured in a water bath at 80 °C for 8–16 h or in ambient storage at 60% RH for 7–14 days. Gel content determined by ASTM D2765-16 after cure is maintained above 60%. The selection of EVA 9F2 over LDPE in this route lowers the Vicat softening point and improves stress crack resistance of the bedding layer under bending, but the peroxide and silane levels must be revalidated if the melt flow rate drifts outside 1.8–2.4 g/10 min because grafting efficiency is sensitive to residence-time distribution. The finished cable bedding is tested against IEC 60502-1 for low-voltage cable construction and against RoHS Directive 2011/65/EU for heavy-metal restrictions.
| Property | Test method | Acceptance reference |
| Hot set elongation | IEC 60811-507 | ≤175% at 0.2 MPa and 200 °C |
| Gel content | ASTM D2765-16 | ≥60% after cure |
| Tensile strength retention after thermal ageing | IEC 60811-501 | Variation ≤±25% |
| Low-temperature impact | IEC 60811-506 | No cracks at −15 °C |
Injection-moulded seals and grommets made from EVA 9F2 are run on hydraulic or servo machines with clamping force from 800 kN to 2500 kN and a compression ratio from 2.4:1 to 2.8:1. The barrel profile is set to 180–210 °C from feed to nozzle, with the nozzle held 10–15 °C below the front zone to reduce drool. Mould temperature is controlled at 20–35 °C for dimensional stability; water lines are arranged for turbulent flow to maintain a surface temperature differential below 5 °C across the cavity. Injection velocity is set between 30 mm/s and 80 mm/s, and packing pressure is held at 60–80 MPa for 2.0–3.5 s, followed by a holding pressure of 30–40 MPa. Shrinkage measured by ISO 294-4:2018 is 1.4–1.8% in flow direction and 1.2–1.5% transverse; the difference is larger than LDPE because the polar acetate group increases orientation. Tensile strength per ISO 527-2:2012 type 1A specimens is 9–13 MPa and elongation at break is 700–850%. The compound is blended with 0.1–0.3 wt% primary antioxidant and 0.1–0.2 wt% zinc stearate as mould release. Pre-drying at 70 °C for 2 h is applied only when surface moisture is visible or when the material has been stored at relative humidity above 60%. The low VA content gives sufficient ESCR for sealing applications exposed to diluted detergents, and the finished part is tested for compression set at 23 °C and 70 °C by ISO 815-1:2019 to verify sealing force retention. For sealing parts intended for repeated food contact, FDA 21 CFR 177.1350 applies; for potable water gaskets, migration testing under EU 10/2011 is performed. The main failure mode observed on production lines is jetting at thin gate sections below 0.8 mm; gate diameter is therefore maintained above 1.0 mm and the vestige is kept below 0.3 mm to avoid crack initiation.
In blown film coextrusion, EVA 9F2 is used as the sealant skin of a three-layer film for frozen food packaging. The extruder size for the sealant layer is typically 45 mm 30D, feeding a spiral mandrel die with die gap set at 1.8–2.2 mm. Melt temperature is kept between 190 °C and 210 °C; above 220 °C the bubble becomes unstable because the melt strength drops and gels may form from acetate decomposition. Blow-up ratio is set at 2.2–2.8:1 and frost line height is controlled between 400 mm and 600 mm by adjusting cooling-air volume. The sealant skin is blended with LDPE at 20–50 wt% EVA 9F2 depending on target seal strength and frozen-food packaging line speed. At 30 wt% EVA 9F2, the dart impact resistance by ASTM D1709-16a method A is 110–140 g on a 50 μm film, and the seal strength by ASTM F88/F88M-21 at 130 °C jaw temperature and 0.3 MPa jaw pressure is 8–12 N/25 mm. The film is intended for frozen vegetables, frozen seafood, and ice cream packaging where low-temperature toughness is required at −20 °C. Compliance with food contact requirements follows FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers and European Commission Regulation (EU) No 10/2011 for plastic materials in contact with food; migration testing is performed under the intended frozen-food time and temperature conditions. The main operational boundary is die lip build-up from low-molecular-weight acetate fractions; the die should be purged with LDPE every 24 h of continuous operation, and the purge volume should be at least 5–7 times the screw channel volume.
EVA 9F2 is used as a stiff base resin in chemically crosslinked foam for gaskets, shock-absorbing pads, and flooring underlayment. The compound is prepared on a two-roll mill at 105–115 °C with a friction ratio of 1.1:1 to 1.2:1. The formulation is built on 100 phr EVA 9F2, with dicumyl peroxide at 0.6–1.2 phr as crosslinker, azodicarbonamide at 4–8 phr as blowing agent, zinc oxide at 1.0–2.0 phr as activator, zinc stearate at 0.5–1.0 phr as release agent, and calcium carbonate at 10–30 phr for nucleation and cost reduction. The compounded sheet is calendered to 2–4 mm and then expanded and crosslinked in a compression press at 155–170 °C under 10–15 MPa. The critical processing conflict is the overlap between dicumyl peroxide cure onset and azodicarbonamide gas evolution. If the press temperature is raised too quickly above 170 °C, the blowing agent decomposes before the gel content reaches 40%, producing coalesced cells and surface blowholes. Conversely, if the cure plateau is held too long above 90% gel content, the viscosity rise suppresses expansion and the foam density remains above 0.30 g/cm³. Representative production trials on EVA 9F2 with 0.8 phr dicumyl peroxide and 6 phr azodicarbonamide at 160 °C for 8 min give foam density of 0.18–0.25 g/cm³, tensile strength of 0.9–1.4 MPa, and elongation at break of 180–260% by ASTM D3575-14. Because the 9 wt% VA content is lower than typical foam grades at 18–28 wt% VA, the foam is harder and more creep-resistant, but less elastic; compression set at 50% deflection by ASTM D3575-14 is higher than foam made from higher-VA copolymers, and published data for this specific grade in azodicarbonamide foaming is limited, so production-scale validation on the actual press is required before large runs. The finished foam is typically die-cut and used where low rebound and high dimensional stability are valued, such as HVAC gaskets and anti-vibration pads.
In carbon black masterbatch production, EVA 9F2 is not used as the sole carrier because its 2 g/10 min melt flow rate is too low for jet-black dispersion in high-speed twin-screw compounding. Instead, the grade is blended at 30–50 wt% with an LDPE carrier of 20–40 g/10 min to improve carbon black wetting and reduce agglomerates. The compounding line is a co-rotating twin-screw extruder with L/D 48, specific energy input of 0.20–0.25 kWh/kg, and melt temperature at 200–220 °C. Carbon black loading is 45–50 wt%; the addition of EVA 9F2 at 40 wt% of the resin phase reduces filter pressure value as measured by ISO 11468:2021 at 240 °C from above 2.0 MPa for pure LDPE carrier to below 1.2 MPa at the same carbon black concentration. The masterbatch is let down at 3–5 wt% into film, pipe, or cable jacketing compounds. The operational constraint is the low melt flow of EVA 9F2: feed throat temperature must stay below 100 °C to prevent premature melting and bridging, and the screw design must include gear-type mixing elements downstream of the carbon black feed port. A production bottleneck at higher EVA 9F2 fractions above 50 wt% of the resin phase is torque increase and melt pressure increase at the screen changer; screen packs above 150 mesh are avoided to keep die pressure below 70 bar. The finished masterbatch is tested for carbon black dispersion by ASTM D5596-21 and for moisture content by Karl Fischer titration, with moisture below 0.10 wt% to prevent film defects in let-down applications.
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SINOPEC EVA 9F2 is an ethylene-vinyl acetate copolymer identified in technical documentation as a film and extrusion grade with a nominal vinyl acetate content of 9.0 wt% and a melt mass-flow rate of approximately 2.0 g/10 min determined at 190 °C under a 2.16 kg load according to ISO 1133-1:2022. Published typical property data report density at 0.930 g/cm³ measured to ISO 1183-1:2019, tensile strength at break near 18 MPa and elongation at break near 650% tested under ASTM D638-14, Vicat softening point around 88 °C under ASTM D1525-17e1, and a DSC melting peak around 99 °C under ASTM D3418-21. The grade is positioned for heavy-duty blown film, agricultural film, coextruded seal layers, extrusion compounding, and masterbatch carrier systems in which a controlled reduction of polyolefin crystallinity is required without the higher tack and lower modulus of high-vinyl-acetate copolymers.
The reported values are typical lot-profile data intended for grade selection, not a certificate of analysis. Lot-to-lot variation in comonomer content and molecular weight distribution can shift viscosity, seal initiation, and crystallisation behaviour. Incoming inspection should therefore verify melt mass-flow rate and density on each delivery, and comparative sealing or mechanical tests should be repeated after any formulation change. The nominal vinyl acetate content of 9.0 wt% should be confirmed against the supplier certificate because even a drift of ±0.5 wt% may alter heat-seal temperature and film stiffness on multi-layer lines.
In blown film extrusion, SINOPEC EVA 9F2 is processed on conventional LDPE-type single-screw extruders using barrier screws, barrel diameters between 45 mm and 90 mm, and L/D ratios from 24:1 to 30:1. A workable temperature profile begins with the feed throat at 40–50 °C, first zones at 140–150 °C, compression zones at 160–180 °C, metering zones at 180–190 °C, and die head at 180–200 °C. Melt temperature should be held below 205 °C for typical cycle times. Above 210 °C, residence periods longer than 20 minutes may initiate measurable deacetylation of the vinyl acetate comonomer, producing acetic acid and causing discoloration, odour, and a decline in melt strength.
Blown film bubble stability for this grade is influenced by its moderate melt strength relative to high-molecular-weight LDPE. Blow-up ratios of 2.0:1 to 3.0:1 are typical, with frost-line height adjusted to maintain neck geometry. Low melt strength can appear as bubble hunting when air-ring velocity is excessive or when internal bubble cooling is unbalanced. Die gap settings from 1.2 mm to 1.6 mm are suitable for film gauges between 40 μm and 150 μm; heavier film above 150 μm may require die gaps of 1.8–2.2 mm to reduce shear heating and minimise the risk of melt fracture. The use of grooved-feed extruder sections and screen packs with 40/60/100 mesh layers is common, but pressure-drop increases above 5% of baseline during production may indicate gel accumulation or feed-temperature drift.
For cast film lines with line speeds above 250 m/min, published data for SINOPEC EVA 9F2 in this specific configuration is limited. The resin should be validated on the target line at the intended haul-off rate, die width, and chill-roll temperature to establish whether draw resonance or surface haze develops. Screw speed trials on a 65 mm extruder between 20 rpm and 90 rpm can be used to map melt pressure, motor load, and output stability before committing to continuous production. Because the viscosity curve and shear thinning behaviour of this grade are not available from published capillary rheometry, direct machine-response profiling is more reliable than extrapolation from other EVA grades.
In heavy-duty shipping sacks and agricultural tunnel films, 9F2 is commonly coextruded as a seal or toughness layer rather than used as the entire structure. The vinyl acetate comonomer disrupts polyethylene crystallinity, lowering crystalline melting enthalpy and increasing chain-segment mobility. This mechanism improves low-temperature elongation and reduces seal initiation temperature relative to pure LDPE of similar melt flow rate. In monolayer or coextruded constructions, typical heat-seal trials under 0.2 N/mm² seal-bar pressure using ASTM F2029-16 show seal initiation around 115 °C for a 20 μm film, with a stable seal plateau between 130 °C and 150 °C at 0.5–1.0 s dwell time. These temperatures must be adjusted for film thickness, seal-bar geometry, and the heat capacity of the substrate; destructive peel testing according to ASTM F88/F88M is required to confirm seal strength.
The same polar vinyl acetate units improve printing ink adhesion and solventless lamination bond strength relative to nonpolar polyethylene surfaces, although corona discharge treatment at 38–42 mN/m surface energy remains advisable for high-speed gravure or flexographic conversion. In masterbatch carrier applications, the 2.0 g/10 min melt mass-flow rate provides sufficient melt viscosity for pigment wetting at letdown ratios commonly between 2% and 6% without excessive shear heating. The grade is not optimised as a high-load carrier for mineral additives above 50% ash content; published data for such formulations is limited and requires laboratory compounding trials.
At 9.0 wt% vinyl acetate content, 9F2 retains a crystalline structure closer to LDPE than is observed in 14% or 18% vinyl acetate EVA grades. This gives higher Vicat softening point, higher modulus, and better dimensional stability under warm handling conditions, while the polar comonomer still improves sealing, toughness, and adhesion relative to LDPE. Table 1 compares representative published values for SINOPEC EVA 9F2 with a typical 14% VA EVA and a typical LDPE film resin.
| Property | SINOPEC EVA 9F2 | 14% VA EVA | LDPE film resin | Test method |
|---|---|---|---|---|
| Melt mass-flow rate | 2.0 g/10 min | 2.0 g/10 min | 2.0 g/10 min | ISO 1133-1:2022 |
| Density | 0.930 g/cm³ | 0.932 g/cm³ | 0.923 g/cm³ | ISO 1183-1:2019 |
| Vinyl acetate content | 9.0 wt% | 14.0 wt% | 0.0 wt% | Internal FTIR |
| DSC melting peak | 99 °C | 93 °C | 110 °C | ASTM D3418-21 |
| Vicat softening point | 88 °C | 79 °C | 95 °C | ASTM D1525-17e1 |
| Tensile strength at break | 18 MPa | 16 MPa | 14 MPa | ASTM D638-14 |
| Elongation at break | 650% | 700% | 550% | ASTM D638-14 |
Values in Table 1 are comparative typical values drawn from public resin technical data for film-grade materials; they are not a specification for any individual production lot. The practical consequence of the lower vinyl acetate content in 9F2 is a narrower heat-seal plateau and higher seal initiation temperature than a 14% VA EVA, but also greater stiffness, less room-temperature surface tack, and improved handling after film winding. In applications requiring very low sealing temperatures or very high hot tack, a higher-VA grade is usually substituted, whereas 9F2 is preferred when film blocking, roll deformation, and tacky extrusion are process concerns.
Moisture absorption during dry indoor storage is low, but condensation on cold pellets can introduce surface water that produces steam bubbles and film defects. If the resin is stored at relative humidity above 60%, or if pellets are transferred from an unheated warehouse into a warm production hall, pre-drying at 60–70 °C for 2–4 h in a desiccant or hot-air hopper dryer is sufficient to remove surface moisture. Extended drying above 80 °C is not required and may soften the pellets or increase agglomeration risk in the hopper. Batch-to-batch variance in melt mass-flow rate can shift extruder pressure and screw torque; on a 65 mm grooved-feed extruder running at 70 rpm, pressure excursions greater than 5% from the established baseline should prompt confirmation of lot MFR and feed-zone temperature stability.
When EVA is processed above 210 °C, thermal degradation proceeds by ester side-group elimination, releasing acetic acid and leaving unsaturation in the polymer backbone. This reaction accelerates with residence time and temperature, producing amber discoloration, acidic odour, reduced melt strength, and surface defects in film. The onset is gradual; intermittent production stops with material held in the barrel for more than 20 minutes can accumulate degradation products that later slough into the melt stream as gel specks. Die-lip deposits are a common failure signature on production-scale blown film lines, appearing as streaking or local thickness variation in the final web.
Purging should be performed with a low-density polyethylene or high-density polyethylene purge resin before extended shutdowns. The purge should displace the EVA from the screw, adapters, die, and screen changer until the melt shows no haziness or yellowing. Avoid combinations with amine-based additives, certain metal-based colour concentrates, or halogenated flame retardants unless their thermal stability at the processing temperature has been established under actual residence-time conditions. Acidic degradation by-products can corrode unprotected tool steel die lips and accelerate wear in screen changers; nickel-plated dies and anticorrosive coatings reduce this risk in long campaigns.
Compliance documentation for SINOPEC EVA 9F2 should be verified for the target market and end use. For food-contact applications in the United States, ethylene-vinyl acetate copolymers may fall under FDA 21 CFR 177.1350; for the European Union, finished-article compliance with Regulation (EU) No 10/2011 and its migration test matrix must be demonstrated, not assumed from the resin grade alone. REACH and RoHS declarations are supplier-specific and should be obtained from the distribution source with the lot certificate. Processors blending recycled EVA or high-VA reclaim should recalculate the final vinyl acetate content and melt mass-flow rate, because dilution of 9F2 with higher-VA scrap will shift seal initiation temperature and may increase roll-blocking, while LDPE reclaim will raise crystallinity and reduce the intended sealing benefit.
