| HS Code | 757088 |
| Va Content | 7.5 wt% |
| Melt Flow Rate 190 C 2 16 Kg | 1.5 g/10min |
| Density | 0.93 g/cm³ |
| Melting Point | 88 °C |
| Vicat Softening Point | 72 °C |
| Brittleness Temperature | -70 °C |
| Tensile Strength At Break | 22 MPa |
| Elongation At Break | 700% |
| Shore A Hardness | 95 |
| Flexural Modulus | 120 MPa |
| Tear Strength | 80 kN/m |
| Water Absorption | 0.01% |
As an accredited SINOPEC Sanren EVA 7.5/1.5 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SINOPEC Sanren EVA 7.5/1.5 is supplied in 25 kg net multi-layer paper bags, palletized and stretch-wrapped for safe transport and storage. |
| Container Loading (20′ FCL) | 20′ FCL: palletized, shrink-wrapped EVA 7.5/1.5 resin, securely blocked, ventilated, protected from moisture, safe for transport. |
| Shipping | SINOPEC Sanren EVA 7.5/1.5 ships as virgin pellets in 25kg woven bags on pallets, wrapped and secured for container transport. Keep dry, away from heat and direct sunlight. Avoid excessive compression during stacking. Standard chemical handling applies; no special hazard classification for sea, air, or road freight. |
| Storage | Store SINOPEC Sanren EVA 7.5/1.5 in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture absorption and contamination. Avoid contact with oxidizing agents. Maintain indoor temperature below 30°C (86°F). Under recommended conditions, shelf life is typically 12 months from receipt. |
| Shelf Life | Shelf life is typically 12 months from manufacture when stored in a cool, dry place away from direct sunlight and heat. |
In blown film lines producing 150–200 µm greenhouse covers, SINOPEC Sanren EVA 7.5/1.5 is let down at 25 wt% to 35 wt% into LDPE with melt flow rate 0.3 g/10 min to 0.7 g/10 min; up to 10 wt% mLLDPE is added to maintain dart impact after UV stabiliser incorporation. The nominal melt flow rate of the grade is 1.5 g/10 min when determined per ISO 1133-1:2022 at 190 °C under 2.16 kg load, and the vinyl acetate content is 7.5 wt%. The VA segment improves stress-crack resistance in contact with metal frame wire and increases long-wave infrared retention relative to LDPE, but the 1.5 g/10 min melt flow rate limits throughput on high-shear grooved-feed extruders. Melt temperature is held between 165 °C and 195 °C; sustained operation above 205 °C triggers acetic acid elimination and gel formation, which appears as bubble instability and rising screen-pack pressure. On a 65 mm extruder with 30:1 L/D and die diameter 350 mm, die gap is set at 1.8 mm to 2.4 mm, blow-up ratio from 2.0 to 3.2. Pre-drying is not required when storage relative humidity is below 60%; otherwise hopper drying at 60 °C to 65 °C for 2 h to 4 h prevents surface streaking. UV stabiliser masterbatch is dosed at 1.5 wt% to 2.5 wt%, with HALS and benzophenone absorbers. Film gauge control requires internal bubble cooling and automatic die bolt adjustment because melt strength fluctuations below 165 °C produce gauge bands beyond ±5%. Compliance testing follows EN 13206:2017 for greenhouse cover film, with tensile properties per ISO 527-3, elongation at break measured on 15 mm wide strips at 500 mm/min, and dart impact per ISO 7765-1 Method A. The finished product is a three-layer greenhouse cover of 180 µm nominal thickness; the EVA-containing core layer provides puncture resistance during installation and seasonal wind loading, while outer LDPE layers carry UV stabilisers and antifog additive packages. The film is not recommended for contact with copper-containing pesticide sprays, because copper ions accelerate thermo-oxidative degradation of the VA segment.
Heavy-duty industrial sack extrusion on 70 mm smooth-bore extruders uses the same grade at 15 wt% to 25 wt% in blends with LLDPE and LDPE for flat films and side-gusset tubing of 100 µm to 150 µm. The low melt index raises melt strength and bubble stability when the blow-up ratio exceeds 2.5. Barrel temperatures are set at 160 °C to 190 °C; die head temperature is maintained at 180 °C to 195 °C. In coextruded sacks the EVA-rich layer is placed in the core, with outer layers of LLDPE containing 0.1 phr to 0.3 phr slip and antiblock. The final sacks are used for packaging glass fibre insulation, polymer chips, and construction aggregate; the EVA modification resists pinhole formation and tearing during filled drop tests. Compliance for dangerous goods packaging is assessed under the UN Manual of Tests and Criteria, Part III, drop and stacking tests rather than by resin-level certification alone. Fabricators report lower burst failure on side gussets at 45 kg to 50 kg fill weight when EVA replaces 5 wt% to 10 wt% of LDPE in the core, but published data for this specific grade is limited. Screw speed is normally limited to 80 rpm to 100 rpm because melt pressure above 32 MPa at the screen pack produces melt fracture and uneven film thickness. Copper-alloy thermocouple wells and die parts are avoided because residual acetic acid at processing temperature attacks copper and accelerates degradation.
High-shrink industrial collation film uses the grade at 20 wt% to 30 wt% with mLLDPE and LDPE in a double-bubble line. The primary tube extruder is a 65 mm machine with 30:1 L/D, die gap 1.5 mm, and melt temperature 185 °C to 205 °C; the secondary orientation oven is maintained at 110 °C to 125 °C. Machine-direction stretch ratios range from 4:1 to 5:1, and transverse-direction stretch ratios from 4:1 to 6:1. The 1.5 g/10 min melt flow rate raises orientation stress but also increases resistance to bubble burst. Die head pressure above 30 MPa produces sharkskin melt fracture on the primary tube surface; adding 0.05 wt% to 0.10 wt% of fluoroelastomer processing aid shifts the onset of sharkskin to higher shear rates. The oriented film is tested for free shrink per ASTM D2732 at 120 °C and 135 °C, tensile properties per ISO 527-3, and puncture resistance per ASTM D5748. Final product is a collation shrink film for beverage cans, PET bottles, and glass jars with thickness from 30 µm to 60 µm. For food-contact use, the final article must satisfy EU Regulation 10/2011 overall migration limits per EN 1186; direct contact with fatty food simulants requires article-level verification because low-VA EVA has higher diffusion resistance than high-VA grades but is not universally accepted without extraction testing.
Where the grade functions as a masterbatch carrier for polyolefin packaging applications, twin-screw compounding on a 50 mm co-rotating extruder with 40:1 L/D is operated at screw speed 300 rpm to 500 rpm and barrel temperature 180 °C to 210 °C. The low melt flow rate of 1.5 g/10 min provides sufficient melt strength for strand pelletising; however, die-face cutter water temperature must be kept below 25 °C to prevent agglomerated pellets. A standard carbon black masterbatch formulation contains 50 wt% to 60 wt% EVA 7.5/1.5, 35 wt% to 45 wt% furnace black, and 3 wt% to 5 wt% PE wax. The VA group improves pigment wetting as measured by the filter pressure value method per EN 13900-5. Final masterbatch is let down at 3 wt% to 6 wt% in polyolefin film and moulding compounds. Compliance for food-contact masterbatches depends on end-use restrictions under FDA 21 CFR 177.1350 and EU Regulation 10/2011; the final article must be tested for overall migration per EN 1186 and specific migration of vinyl acetate when relevant. The carrier resin should not be used in formulations containing free amine-based heat stabilisers, because amine by-products can discolour the VA segment and reduce dispersion stability during long residence times.
| Regulatory/test strand | Applicable designation | Relevant parameter | Application boundary |
|---|---|---|---|
| US FDA food-contact resin | 21 CFR 177.1350 | Ethylene-vinyl acetate copolymer limits | Masterbatch and film end use only where final article passes extraction |
| EU plastics food contact | EU Regulation 10/2011 | Overall migration ≤ 10 mg/dm² per EN 1186 | Oily food simulants require article-level verification |
| Greenhouse cover mechanicals | EN 13206:2017 | Tensile, dart impact, IR transmission | Film thickness 150 µm to 200 µm |
| Dangerous goods packaging | UN Manual of Tests and Criteria, Part III | Drop height, stack duration | Filled sack certification, not resin certificate |
| RoHS | Directive 2011/65/EU | Pb ≤ 1000 mg/kg, Cd ≤ 100 mg/kg, Hg ≤ 1000 mg/kg | Electronics packaging trays |
Injection moulded liners for flavour-sensitive and moisture-sensitive products use EVA 7.5/1.5 at 30 wt% to 50 wt% in LDPE, with 0.5 wt% to 1.0 wt% precipitated silica as anti-block. The moulding machine is specified with a compression ratio 2.5:1 to 3.0:1, barrel temperatures 180 °C to 200 °C, and clamp force calculated from projected area at 350 bar to 450 bar injection pressure. Mould temperature is held at 20 °C to 40 °C. Melt temperature above 210 °C causes splay and acetic acid odour; below 175 °C high injection pressure produces short shots and gate stringing. The finished liners show lower seal initiation force and improved reseal after repeated opening compared to LDPE alone. Leakage performance is tested per ASTM D4991 with vacuum decay; sensory compliance is assessed under EN 1230 or equivalent panel methods. This application is limited to non-sterile closures because the low-VA grade has not been validated for gamma or ethylene oxide sterilisation at industrial dose ranges. Copper-alloy inserts in the hot runner are avoided because residual VA degradation products attack copper surfaces and can discolour the melt. Warpage on flat liners increases above 1.2 mm when mould temperature exceeds 40 °C; this is controlled by balanced cooling circuits and post-mould shrinkage measurement per ISO 294-4.
For returnable industrial dunnage and electronic component trays, a blend of 40 wt% EVA 7.5/1.5 with 60 wt% LDPE is run on a single-screw extruder feeding a flat die. Melt temperature is 185 °C to 205 °C and polishing roll stack temperature is 70 °C to 90 °C. Sheet thickness is controlled between 1.5 mm and 3.0 mm. The VA-containing phase reduces stress whitening when trays are flexed at low ambient temperatures, while the low melt flow rate maintains sag resistance during thermoforming. Plug-assisted forming is carried out at sheet surface temperatures of 120 °C to 140 °C, measured with an infrared pyrometer; below 110 °C the sheet develops microcracking at the draw corners. The formed trays are not suitable for sustained contact with acetone, ethyl acetate, or aromatic hydrocarbons because the VA segment swells; chemical resistance is screened per ISO 175:2010. Final article load performance is measured by edge crush resistance and drop testing rather than by resin-level tensile data. Published data for this specific EVA grade in thermoformed electronics trays is limited; process setup therefore requires line-side rheometric verification using a capillary rheometer at 190 °C over shear rates 100 s⁻¹ to 1000 s⁻¹. The formulation is incompatible with copper stabiliser packs and should not be processed on extruders with brass screen changers or copper mesh gaskets exposed to the melt stream.
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The product designated SINOPEC Sanren EVA 7.5/1.5 is an ethylene-vinyl acetate copolymer in which the grade designation encodes two nominal characteristics: a vinyl acetate comonomer mass fraction of 7.5 wt% and a melt mass-flow rate of 1.5 g/10 min determined at 190 °C under a 2.16 kg piston load in accordance with ISO 1133-1:2022. Vinyl acetate content is normally confirmed by infrared spectroscopy or saponification-titration procedures aligned to ISO 8985; lot-specific certificates of analysis should be obtained before blending or conversion. Density is generally reported between 0.928 g/cm³ and 0.932 g/cm³ under ISO 1183-1:2019. The resin is supplied as a pelletized, ethylene-rich thermoplastic. These nominal values place the material in the low-vinyl-acetate segment of the EVA family, where crystallinity remains polyethylene-like but the acetate side groups introduce polarity that alters seal strength, adhesion, and low-temperature ductility relative to LDPE homopolymer.
The 7.5 wt% comonomer content disrupts polyethylene crystallite thickness distribution without eliminating crystallization. Differential scanning calorimetry under ISO 11357-3 typically places the main melting endotherm in the 100 °C to 108 °C range for this composition class, with crystallization onset near 95 °C to 100 °C; actual lot values must be confirmed because additives and molecular architecture can shift the transition. The reduced crystalline fraction is the structural basis for improved low-temperature toughness and stress-crack resistance compared with LDPE homopolymer, while the retained crystallinity provides sufficient stiffness and cuttability for film-converting lines. Higher-vinyl-acetate grades containing 14 wt% to 28 wt% VA exhibit lower modulus, greater elastic character, and lower seal-initiation temperature, but they also increase tack and may require chilled film-handling equipment.
Rheologically, the melt flow index value is a single-point indicator and is not sufficient for screw-design calculations. Capillary rheometry under ISO 11443 can be used to measure apparent shear viscosity over shear rates from 100 s⁻¹ to 1,000 s⁻¹, which span typical film-die and screw-channel conditions. The melt exhibits pseudoplastic shear thinning; a Newtonian assumption below 10 s⁻¹ is not appropriate for pressure-drop predictions in spiral mandrel or flat-die systems. Power-law consistency and shear-thinning indices derived from lot-specific viscosity curves should be used when simulating melt flow through die lips, feedblocks, or screen packs. The 1.5 g/10 min melt flow index indicates higher viscosity than EVA grades at 4 g/10 min to 8 g/10 min; therefore, extruder drive sizing, thrust-bearing limits, and screen-pack pressure must be checked against measured melt pressure.
On blown-film lines, the 1.5 g/10 min melt flow index corresponds to a moderately high-viscosity melt. Extruders with L/D ratios from 28:1 to 36:1 and barrier screws or Maddock mixing sections provide adequate homogenization without excessive shear heating. Barrel temperatures are commonly set between 160 °C and 220 °C, with die temperatures held in the 170 °C to 210 °C band. The lower limit is governed by melt pressure and surface finish; the upper limit is governed by deacetylation kinetics. Above 220 °C, EVA can evolve acetic acid, especially when residence time is extended by fine screen packs, gear-pump recirculation, or low throughput. Melt pressure at the screen pack and die should be monitored continuously; pressure excursions toward the machine’s rated thrust-bearing limit require throughput reduction or a higher barrel-temperature profile. Die gaps from 0.8 mm to 1.5 mm, blow-up ratios of 2.0:1 to 2.5:1, and frost-line heights adjusted for target gauge are typical starting points for tubular film.
For cast-film and sheet lines, the resin is processed with a die gap between 0.4 mm and 1.0 mm. Melt temperatures in the 200 °C to 220 °C range improve gauge uniformity but reduce melt strength; draw distance, air-knife position, and chill-roll contact are adjusted to limit neck-in and edge-bead instability. The lower crystallization temperature of the 7.5 wt% vinyl acetate grade can make the cast film more prone to blocking than LDPE at the same chill-roll temperature; lower roll temperatures or longer contact arcs may be required. The material is not the preferred candidate for very thin extrusion coating at high line speeds, where grades with melt flow indices from 4 g/10 min to 8 g/10 min typically provide better drawdown.
In heat-seal layers on vertical and horizontal form-fill-seal machines, the 7.5 wt% vinyl acetate content produces a seal-initiation temperature below that of LDPE homopolymer having a comparable melt flow index. Seal strength should be measured under ASTM F88/F88M, and hot tack should be measured under ASTM F1921 or equivalent instrumented hot-tack equipment. Typical laboratory seal trials use dwell times from 0.3 s to 1.0 s and jaw pressures from 0.3 N/mm² to 0.5 N/mm², but packaging-machine speed, film gauge, and contamination must be used to set the final window. Compared with EVA grades containing 14 wt% to 18 wt% vinyl acetate, the 7.5 wt% grade has a higher seal-initiation temperature, lower hot tack, and less blocking. Cold-chain film toughness is evaluated under ISO 7765-1 or ASTM D1709; the improvement over LDPE is measurable but smaller than that provided by EVA grades above 18 wt% vinyl acetate.
In coextruded barrier structures, the grade can be used as a non-reactive polar interlayer between polyethylene skins and polar barrier materials. The acetate groups increase interfacial wetting to polyamide and EVOH relative to LDPE, but the product is not a direct replacement for anhydride-modified tie resins in retort or high-moisture packaging. Interlaminar adhesion is often assessed by ASTM F904 peel testing after lamination. Low-stress packaging may accept peel forces from 2 N/15 mm to 4 N/15 mm, while retort structures require substantially higher values and must be validated on the specific structure. In blown-film coextrusion, the 1.5 g/10 min melt flow index must be matched to the adjacent layers to prevent viscosity mismatch and interfacial instability. When the grade is paired with low-viscosity EVOH or polyamide layers, melt temperature and die gap can be adjusted to move the viscosity ratio closer to the die manufacturer’s recommended range; if the ratio remains too high, interfacial waviness and layer thickness variation may limit the operating window.
| Material class | Nominal vinyl acetate content | Nominal melt flow index | Processing and end-use consequence |
|---|---|---|---|
| SINOPEC Sanren EVA 7.5/1.5 | 7.5 wt% | 1.5 g/10 min | Higher viscosity; general film, sheet, compounding |
| Medium-VA EVA | 14 wt% | 2.0 g/10 min | Lower seal initiation; softer; increased tack |
| High-VA EVA | 18 wt% to 28 wt% | 2.0 g/10 min to 3.0 g/10 min | Greater low-temperature toughness; lower stiffness; higher blocking tendency |
| LDPE homopolymer | 0 wt% | 1.5 g/10 min | Higher crystallinity; lower toughness; lower seal performance |
In compounding operations, the 7.5 wt% vinyl acetate grade is used as a base resin where filler wetting and pigment dispersion must be improved over LDPE. On twin-screw extruders with L/D ratios from 40:1 to 52:1, the polar acetate group assists carbon black and mineral filler incorporation, but the 1.5 g/10 min melt flow index requires higher specific energy than grades above 5 g/10 min. Screw speeds from 200 rpm to 500 rpm are common for production compounding, with specific energy input monitored in kWh/kg to avoid exceeding the degradation threshold. The upper barrel temperature should remain at or below 220 °C. When chemical blowing agents such as azodicarbonamide are used, the decomposition by-products should be assessed for their potential to accelerate deacetylation; pre-drying and corrosion-resistant downstream equipment may be required. Amine-functional processing aids should be evaluated with laboratory-scale thermal stability testing because published data for this specific configuration is limited.
The primary operational boundary is thermal residence time. Ethylene-vinyl acetate copolymers undergo slow deacetylation at elevated temperature, releasing acetic acid that can attack unplated screw, barrel, and die surfaces. Extruders with nitrided or corrosion-resistant barrel liners are preferred for extended campaigns. Melt temperatures should not exceed 220 °C except for very short residence times, and shutdown procedures should purge the barrel with LDPE or a commercial purging compound to displace material from stagnant zones. Pre-drying is less critical than for hygroscopic polymers, but pellets stored in unheated warehouses at relative humidity above 60% may carry surface moisture that creates film surface defects. A desiccant dryer set from 60 °C to 80 °C for 4 h to 6 h is a common preventive step before extrusion coating or foaming; actual drying time must be adjusted for silo load and initial moisture. In storage, sustained temperatures above 40 °C should be avoided, and the producer’s shelf-life guidance should be respected. Before using aged material, melt flow index and vinyl acetate content should be re-tested.
Regulatory status is product-specific and must be confirmed with the producer’s lot-specific documentation. For food-contact layers, converters commonly request compliance statements against FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers and EU Regulation 10/2011 with overall-migration limits. The raw grade is not a finished food-contact article; additives, lamination adhesives, printing inks, and conversion conditions can affect the final article. Under REACH, the supplier should confirm registration status for the European Economic Area, and under RoHS Directive 2011/65/EU, EVA is generally outside the restricted heavy-metal and phthalate scope, but compounded products may require test data if they contain pigments or additives.
| Property or requirement | Reference method or directive | Measurement condition or remark |
|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 | 190 °C, 2.16 kg |
| Vinyl acetate content | ISO 8985 | FTIR or saponification titration |
| Density | ISO 1183-1:2019 | 23 °C; reported range 0.928 g/cm³ to 0.932 g/cm³ |
| Thermal transitions | ISO 11357-3 | DSC heating/cooling; lot-specific |
| Food contact | FDA 21 CFR 177.1350 | Producer declaration required |
| EU food contact | EU Regulation 10/2011 | Overall migration; final article testing |
For high-speed extrusion coating above 150 m/min, published data for this specific configuration is limited; the low melt flow index may restrict drawdown, and line trials remain the controlling validation method. For applications requiring continuous exposure to temperatures above 60 °C, long-term property retention should be evaluated on the finished part because oxidative and deacetylation effects depend on stabilizer package and part thickness.
