| HS Code | 817321 |
| Vinyl Acetate Content | 11% |
| Melt Flow Rate 190 C 2 16 Kg | 3.5 g/10min |
| Density | 0.934 g/cm³ |
| Tensile Strength | 20 MPa |
| Elongation At Break | 650% |
| Vicat Softening Point | 82 °C |
| Melting Point | 92 °C |
| Shore Hardness | 90 Shore A |
| Flexural Modulus | 80 MPa |
| Brittleness Temperature | -70 °C |
As an accredited SINOPEC Sanren EVA 11/3.5 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SINOPEC Sanren EVA 11/3.5 is supplied in 25 kg multi-layer paper bags, palletized and shrink-wrapped for protection. |
| Container Loading (20′ FCL) | 20′ FCL container loading of SINOPEC Sanren EVA 11/3.5, packed in 25kg bags, palletized, safely secured and ventilated. |
| Shipping | SINOPEC Sanren EVA 11/3.5 ships as ethylene-vinyl acetate copolymer granules. It is supplied in 25 kg moisture-resistant bags, loaded on pallets and containerized. Keep dry and ventilated during transit, avoid direct heat/sun and sharp impacts. No special dangerous goods classification under standard conditions. |
| Storage | Store SINOPEC Sanren EVA 11/3.5 in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture uptake and contamination. Avoid high temperatures and humidity to prevent clumping or degradation. Ensure good housekeeping to minimize dust accumulation, as finely dispersed material may form explosive mixtures. |
| Shelf Life | Shelf life is typically 12 months when stored unopened in a cool, dry area, away from direct sunlight and heat. |
Production-scale compounding of halogen-free flame-retardant low-voltage cable insulation using SINOPEC Sanren EVA 11/3.5 as the polymer matrix is typically conducted on a corotating twin-screw extruder with a screw diameter of 75 mm and an L/D ratio of 48:1. The grade has a nominal vinyl acetate content of 11 wt% and a melt flow rate of 3.5 g/10 min when measured at 190 °C under 2.16 kg load in accordance with ISO 1133-1:2022 or ASTM D1238. Pre-drying at 70–80 °C for 4–6 h is applied when bag storage has exceeded 60% relative humidity; residual moisture above 0.03% by weight produces surface porosity and melt-pressure fluctuation at the strand die. The base formulation is 100 phr EVA 11/3.5, with precipitated magnesium hydroxide or ground aluminium trihydrate filler at 150–180 phr, zinc borate at 5–10 phr, and a hindered phenolic/phosphite stabiliser package at 0.2–0.5 phr. Screw speed is held between 250 rpm and 400 rpm, with barrel zones from feeding to die set at 120 °C, 135 °C, 145 °C, 150 °C, 155 °C, 160 °C, 160 °C, 155 °C; melt temperature is kept below 180 °C to limit hydrotalcite decomposition and acetic acid release from vinyl acetate groups. On lines without side feeding, filler addition above 160 phr elevates specific energy input above 0.28 kWh/kg and reduces output by 15–20%; a two-stage side feeder with atmospheric vent at barrel 6 and vacuum vent at barrel 8 maintains stable strand quality. Terminal products include halogen-free low-voltage power cable sheathing, control cable insulation, and photovoltaic cable jacketing tested according to IEC 60332-1-2, IEC 60754-1, IEC 60754-2, EN 50267-2-2, and UL 94 V-0 vertical flame rating. The relevant EU chemical restriction framework is RoHS 2011/65/EU Annex II, with bromine and chlorine thresholds below 900 ppm; REACH candidate list screening is required for imported compounds. The grade displays an operational boundary: combinations with unneutralised amine-based flame retardant additives are avoided because free amines accelerate ester pyrolysis and reduce the onset degradation temperature by 10–15 °C.
| Assessment | Designation | Test condition | Typical acceptance threshold |
|---|---|---|---|
| Vertical flame spread | IEC 60332-1-2 | Single cable, 60 s flame application | Char height ≤425 mm above lower clamp |
| Halogen acid gas | IEC 60754-1 | 0.1 g sample, 900 °C furnace | pH ≥4.3, conductivity ≤10 µS/mm |
| Material flammability | UL 94 V-0 | 3.2 mm thickness | Total afterflame ≤50 s for five specimens, no flaming drips |
| Restricted halogens | RoHS 2011/65/EU Annex II | XRF screening | Br ≤900 ppm, Cl ≤900 ppm |
Seal initiation temperature in coextruded flexible packaging using SINOPEC Sanren EVA 11/3.5 as the heat-seal layer is governed by vinyl acetate content, melt-index and chill-roll quenching rate. In monolayer extrusion coating onto 12–20 µm aluminium foil or 9–12 µm PET film, the grade is typically blended with LDPE at 15–30 wt% EVA, or run at 100% EVA for high-seal-integrity medical pouches. The extruder is a single-screw unit with screw diameter 90 mm, L/D 30:1, barrier flight design, and a 0.7–1.0 mm slot die. Melt temperature at the die is maintained at 220–240 °C, air gap 150–250 mm, and chill roll temperature 15–20 °C. Heat seal strength is evaluated according to ASTM F2029-16 at sealing temperature 110–140 °C, sealing pressure 2.75 bar, and dwell 1.0 s; peel strength above 15 N/15 mm is commonly specified for aseptic paperboard laminates. Food-contact compliance for the seal layer is verified under 21 CFR 177.1350 when the extractive limit for total non-volatile residues is not exceeded, and under EU 10/2011 overall migration limit 10 mg/dm² for plastic food-contact materials. Terminal products include aseptic liquid packaging, condiment sachets, medical device header pouches, and lamination films for high-speed form-fill-seal lines. A processing boundary is the low melt strength of EVA relative to LDPE; at die temperatures above 250 °C, edge neck-in exceeds 80 mm and draw resonance appears below 15 µm coating thickness unless the air gap is shortened.
For carbon black and organic pigment concentrates let down in polyolefin film and injection moulding applications at ratios between 4:1 and 10:1, SINOPEC Sanren EVA 11/3.5 is employed as the carrier phase at 50–65 wt% of the masterbatch, with 30–40 wt% carbon black, 1–3 wt% processing aid, and 0.5–1.0 wt% antioxidant. Compounding is carried out on a corotating twin-screw extruder with L/D 40:1, screw diameter 58 mm, and pigment side feeding at barrel 5; melt temperature is held at 160–180 °C to limit EVA thermal degradation and viscosity shift. Dispersion quality is assessed by film surface defect counts under ISO 11420 or pressure-rise test on a 14 µm screen pack; a pressure increase below 0.2 bar/kg after 60 min is treated as acceptable for high-quality film grades. The carrier is selected for its 11 wt% vinyl acetate content, which improves pigment wetting relative to neat LDPE while retaining compatibility with LLDPE and HDPE at let-down. Terminal products include agricultural mulch film concentrates, landfill liner black masterbatch, and injection moulding concentrates for closure systems. The relevant conformity framework is REACH substance registration and, for food-grade concentrates, EU 10/2011 migration testing according to EN 1186-1. An operational incompatibility is the use of acid-functional coupling agents in the same masterbatch; free acidic species coordinate with the VA ester groups and reduce filter life.
In injection-moulded LDPE articles where environmental stress crack resistance and low-temperature flexibility are required, SINOPEC Sanren EVA 11/3.5 is blended at 10–25 wt% into LDPE or LLDPE. The dry blend is processed on a single-screw injection moulding machine with clamp force between 800 kN and 3,500 kN, a three-zone screw with compression ratio 2.2:1, and nozzle temperature 180–200 °C. Melt residence time is kept below 5 min to limit vinyl acetate degradation. Environmental stress crack resistance is measured under ASTM D1693-21 condition B, 10% Igepal CO-630; the EVA-containing blend commonly exceeds 500 h without failure, whereas unmodified LDPE at the same moulded thickness may fail before 50 h, though published data for this specific grade in all mould geometries is limited. Tensile elongation at break is determined according to ISO 527-1:2019; addition of 15 wt% EVA 11/3.5 typically raises elongation at break by 50–100% relative to neat LDPE while reducing tensile modulus by 10–20%. Terminal products include flexible industrial pails, squeeze dispensing bottles, protective covers for electrical enclosures, and child-resistant cap bodies. Food-contact packaging versions require verification against 21 CFR 177.1520 for olefin polymers and EU 10/2011 overall migration limit 10 mg/dm². The formulation has an upper continuous service temperature of approximately 80 °C; above this, surface tack develops and dimensional stability is lost.
Shoe sole and technical foam preforms incorporating SINOPEC Sanren EVA 11/3.5 are typically compounded as a low-VA stiffening component in blends with high-VA EVA grades in the range of 10–25 wt% of the total polymer. The formulation includes azodicarbonamide blowing agent at 2.0–3.5 phr, dicumyl peroxide crosslinking agent at 0.4–0.8 phr, zinc oxide at 1.0–2.0 phr, and stearic acid at 0.5–1.0 phr. Mixing is carried out on a two-roll mill at 95–105 °C or in a Banbury internal mixer with ram pressure 0.6 MPa; compound is then pelletised and expanded in a compression mould at 160–170 °C for 6–10 min, followed by cooling under 0.4–0.6 MPa to stabilise cell dimensions. Density of the crosslinked foam is measured according to ISO 845:2006; typical midsole densities fall between 0.15 g/cm³ and 0.25 g/cm³, with Asker C hardness measured according to JIS K 7312 or DIN 53505 in the 50–65 range. The low-VA grade raises hardness and compression set relative to high-VA EVA, which is exploited in dual-density sports sandals and orthotic appliances. Compliance for export footwear compounds includes REACH SVHC screening and, for children’s articles, EN 71-3 migration limits for heavy metals. Terminal products include injection-compression midsoles, sheet foam for yoga mats, and thermoformed cushioning inserts. A processing boundary is the narrow crosslinking window: at mould temperatures below 155 °C, peroxide decomposition is incomplete and cell coalescence occurs; above 175 °C, the EVA matrix undergoes chain scission and surface tack increases.
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SINOPEC Sanren EVA 11/3.5 is an ethylene-vinyl acetate copolymer supplied in pellet form. The grade designation encodes two principal specification fields: a nominal vinyl acetate comonomer content of 11 wt% and a nominal melt flow rate of 3.5 g/10 min determined at 190 °C under a 2.16 kg load in accordance with ISO 1133-1:2022 or ASTM D1238. The low vinyl acetate content positions the material between unmodified low-density polyethylene and softer 18–28 wt% vinyl acetate grades, reducing crystalline perfection while retaining sufficient melt strength for conventional polyolefin extrusion and injection-moulding operations. Applications in which this balance is commonly evaluated include flexible packaging films, profile extrusion, injection-moulded flexible components, and modification of LDPE-rich recyclate.
Release testing for EVA 11/3.5 normally includes comonomer content, melt flow rate, and density. The vinyl acetate content is commonly determined by hydrolysis or infrared methods; the relevant standard designation is ISO 8985:2022. Melt flow rate is measured at 190 °C with a 2.16 kg load using ISO 1133-1:2022 or ASTM D1238. Density is reported according to ISO 1183-1:2019. Because exact lot values vary, the producer batch certificate should be consulted before die design, food-contact qualification, or substrate-adhesion trials.
| Property | Test method | EVA 11/3.5 | LDPE reference | EVA 18 wt% reference |
|---|---|---|---|---|
| Vinyl acetate content | ISO 8985:2022 | 11 wt% nominal | 0 wt% | 18 wt% nominal |
| Melt flow rate | ISO 1133-1:2022 | 3.5 g/10 min (190 °C, 2.16 kg) | 2–4 g/10 min typical film grades | 3 g/10 min nominal comparison |
| Density | ISO 1183-1:2019 | 0.930–0.935 g/cm³ typical; batch certificate required | 0.918–0.925 g/cm³ | 0.940–0.945 g/cm³ |
The density spread reflects vinyl acetate content, additive loading, and thermal history. The low comonomer content keeps the softening point above that of 18 wt% VA grades but below that of LDPE. Comparative Vicat values under ISO 306:2022 method A50 for similar 11 wt% VA EVAs are often in the 75–85 °C range, while LDPE film grades commonly range from 88–100 °C. The melt is pseudoplastic rather than Newtonian; capillary rheometry data generated according to ISO 11443:2021 should be used for die pressure calculations and for matching screw throughput with take-off speed. A single melt flow rate point does not capture the shear-thinning behaviour that controls edge weave, draw resonance, or extruder head pressure.
The vinyl acetate comonomer introduces acetate side groups that disrupt ethylene chain folding. Under differential scanning calorimetry performed according to ISO 11357-3:2018, a polymer of this composition typically displays a broad melting endotherm with a peak near 95–105 °C, whereas LDPE of similar melt flow rate tends to peak near 105–115 °C and an 18 wt% VA EVA tends to peak near 84–92 °C. The crystalline fraction is intermediate; similar EVAs may show 25–35% crystallinity by DSC, compared with roughly 35–45% for LDPE and 18–25% for higher-VA grades. This intermediate crystallinity reduces heat-seal initiation temperature relative to LDPE, but the shift is smaller than that obtained with 18 wt% VA resin. Heat-seal strength determined by ASTM F88/F88M-21 and hot tack determined by ASTM F1921-18 therefore rank EVA 11/3.5 between LDPE and higher-VA EVAs at identical gauge, dwell time, and sealing temperature.
Peel adhesion to aluminium foil, primed polyester, or corona-treated polyethylene measured by ASTM D1876 improves relative to LDPE but remains below that of a 28 wt% VA extrusion-lamination grade. Published peel-adhesion curves for this specific SINOPEC Sanren grade are limited; the comparative position described here is drawn from the broader low-VA EVA copolymer class. Similarly, oxygen transmission rate measured by ASTM D3985 is slightly higher than for LDPE because the acetate comonomer reduces crystalline packing, but the penalty is smaller than for an 18 wt% VA grade. Converters seeking very low seal initiation or maximum foil adhesion should qualify an 18–28 wt% VA grade before selecting EVA 11/3.5.
On a monolayer cast-film line using a 90 mm single-screw extruder with 30:1 L/D barrier screw, barrel temperatures from hopper to adapter are commonly profiled at 160/175/185/190/195 °C, and melt temperature is held below 210 °C. Prolonged residence above 220 °C accelerates deacetylation, producing acetic acid, discoloration, and carbonized deposits on the die lip. Screw speeds above 110 rpm may produce viscous heating sufficient to exceed this ceiling, particularly with a worn screw or high back pressure. Pre-drying at 60–70 °C for 4 h using a desiccant dryer with a dew point of −40 °C is applied when pellets have been stored at relative humidity above 60% or when surface moisture is visible. Fluoropolymer-based polymer processing aids can be used, but amine-based slip or antistatic additives may aggravate acid-catalysed discoloration and die plate-out; compatibility trials should be run before production.
Compared with an LDPE of equivalent melt flow rate, EVA 11/3.5 exhibits a lower tensile yield stress and flexural modulus when tested under ISO 527-2:2012 and ISO 178:2019. The practical consequence is a more flexible part or film at room temperature and a measurable improvement in low-temperature brittleness temperature as determined by ASTM D746-20. Environmental stress-crack resistance under ASTM D1693 is generally superior to LDPE because comonomer disruption reduces spherulitic boundaries that act as crack-propagation paths. These property changes are obtained with only a modest reduction in temperature resistance, which makes the grade appropriate for packaging films that require improved dart impact under ASTM D1709 without the very low modulus of an 18–28 wt% VA EVA.
In blown-film operations, the material should be treated as a lower-melt-strength resin. Bubble stability is generally maintained at blow-up ratios of 1.8:1–2.5:1; blow-up ratios above 3.0:1 may cause bubble flutter unless the air ring is optimized for low-melt-tension polymers and the frost-line height is shortened. Cast-film chill-roll temperatures of 20–35 °C provide adequate web release without excessive curl. For profile extrusion, screw designs with barrel venting and melt temperatures of 180–205 °C are used; a gear pump between extruder and die reduces surging caused by the shear-thinning character of the melt. Haze and gloss values should be measured by ISO 14782 and ASTM D2457 respectively, but chill-roll surface finish and melt temperature often influence these values more than the base resin itself.
As an injection-moulding feedstock, EVA 11/3.5 can be processed on standard reciprocating-screw machines with clamp force capacities from 80–120 t for small flexible parts. Melt temperature is held at 185–210 °C, mould temperature at 20–40 °C, and injection speed is set in the moderate range to avoid jetting. Hold pressure should be minimized because the low crystallinity delays solidification and can extend cycle time relative to LDPE. Mould release agents containing silicone should be qualified before production because excessive release agent can interfere with post-mould adhesion or printing. In masterbatch or compounding applications, the grade can be dry-blended with LDPE or linear low-density polyethylene at 10–30 wt%. On a co-rotating twin-screw extruder with 40:1 L/D, distributive mixing elements, and side-feeding capability, the low softening point assists pigment wetting, but the limited vinyl acetate content means that carbon black and polar organic pigments may require a higher-VA carrier for maximum dispersion stability.
In hot-melt adhesive compounding, EVA 11/3.5 is not a direct substitute for EVA 28/25. The low vinyl acetate content reduces the solubility parameter match with rosin ester tackifiers and aromatic hydrocarbon resins, limiting tack and wet-out measured by loop tack or 180° peel tests. Hot-melt formulators generally select VA contents above 18 wt% to maintain low-temperature adhesive flexibility and substrate wetting. Published data for low-VA EVA in pressure-sensitive or packaging adhesive formulations is limited, and the grade should not be extrapolated into this use without a full adhesive performance matrix.
Food-contact suitability of the base polymer is evaluated under 21 CFR 177.1350 in the United States and under Commission Regulation (EU) No 10/2011 in Europe. The base polymer specification alone does not guarantee final article compliance; converters are responsible for migration testing according to the applicable overall migration limit and specific migration limits, using methods such as EN 1186-1 or equivalent. REACH registration and RoHS compliance depend on the additive package and any colourants or release agents introduced downstream. Storage should be in a clean, dry area at ambient temperature below 50 °C, away from direct sunlight and heat sources. Before lot qualification, melt flow rate and density should be rechecked according to ISO 1133-1:2022 and ISO 1183-1:2019, because lot-to-lot variation in comonomer sequence distribution can alter heat-seal and adhesion performance even when the bulk vinyl acetate content remains within specification.
