| HS Code | 365763 |
| Product | SINOPEC Sanren EVA 4.5/0.5 |
| Material Type | Ethylene-Vinyl Acetate Copolymer |
| Vinyl Acetate Content | 4.5% |
| Melt Flow Rate | 0.5 g/10min (190°C, 2.16kg) |
| Density | 0.925 g/cm³ |
| Melting Point | 105°C |
| Vicat Softening Point | 80°C |
| Tensile Strength At Break | 28 MPa |
| Elongation At Break | 750% |
| Shore Hardness | 45D |
| Brittleness Temperature | -70°C |
| Flexural Modulus | 120 MPa |
As an accredited SINOPEC Sanren EVA 4.5/0.5 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SINOPEC Sanren EVA 4.5/0.5 is supplied in 25 kg woven bags with PE liner, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL container loading of SINOPEC Sanren EVA 4.5/0.5 resin, packed in 25kg bags, palletized, approx 24 tons per container. |
| Shipping | SINOPEC Sanren EVA 4.5/0.5 ships as non-hazardous granules in 25 kg bags or bulk containers. Protect from moisture, heat, and direct sunlight. Store in a dry, ventilated area. Use caution during loading to avoid dust, and keep away from ignition sources. |
| Storage | Store SINOPEC Sanren EVA 4.5/0.5 in a cool, dry, well-ventilated area away from direct sunlight, heat, and open flames. Keep containers tightly sealed to prevent moisture absorption and contamination. Avoid dust accumulation; use grounded equipment to prevent static discharge. Maintain moderate temperatures and keep separate from oxidizing agents. Follow manufacturer’s handling guidelines for safe storage. |
| Shelf Life | Store in cool, dry conditions. Shelf life is typically 12 months from production date if unopened and properly stored. |
Blown-film lines producing 80–120 µm industrial sacks from SINOPEC Sanren EVA 4.5/0.5 operate with grooved-feed single-screw extruders of 55–65 mm screw diameter and L/D 30:1. The melt mass-flow rate of 0.5 g/10 min, determined under ISO 1133-1:2022 Method A at 190 °C under 2.16 kg, contributes to high melt tenacity and reduces neck-in in air-cooled towers when the blow-up ratio is kept between 2.0:1 and 2.5:1. A spiral mandrel die with a die gap of 1.6–2.0 mm is standard for this viscosity class. Barrel setpoints are typically 150 °C rear, 170 °C mid, 175 °C front, and 180 °C die. A melt temperature probe reading above 210 °C should be treated as an upper control limit. Vinyl acetate pendant groups begin acetic acid elimination at elevated temperature, which causes pinhole defects and acidic corrosion on polished die lips. Frost line height on a 65 mm line is normally controlled between 600 mm and 850 mm above the die face to balance transverse and machine-direction orientation. At relative humidity above 60%, surface moisture on cold granules should be removed by hopper heating at 55–60 °C for 1 h. Film produced at 100 µm nominal thickness is tested for tensile properties under ASTM D882-18, for dart-impact resistance under ASTM D1709-16a Method B, and for Elmendorf tear under ASTM D1922-15. The 4.5 wt% vinyl acetate content shifts low-temperature impact failure from brittle puncture toward ductile elongation compared with an LDPE homopolymer of equivalent melt index. Published data for this specific grade is limited, but the failure-mode shift is consistent with the general behavior of low-VA ethylene copolymers. The processing window is narrower than that of LDPE because the maximum melt temperature is approximately 20–30 °C lower. Die-lip build-up can appear during continuous running above 195 °C die temperature, requiring wipedown intervals shorter than 72 h.
Seal initiation behavior in three-layer and five-layer blown-film structures is governed by the disruption of polyethylene crystallite order by randomly distributed vinyl acetate units. At a nominal VA content of 4.5 wt%, the crystalline melting point drops approximately 5–8 °C relative to an LDPE homopolymer of comparable density. The resultant heat-seal initiation temperature shifts downward by a similar margin when measured on a laboratory gradient bar sealer according to ASTM F1921-18. Hot-tack strength at jaw temperatures between 110 °C and 120 °C can exceed LDPE controls of comparable melt index, although published data for this specific configuration is limited. In production, the resin is coextruded at 20–30 wt% of the sealant skin with LDPE or LLDPE. The 0.5 g/10 min melt index creates a viscosity-mismatch risk in shared dies. If the skin layer is paired with a high-MI LLDPE core above 1.0 g/10 min, interfacial flow instability may appear as wavy sealant thickness. A standard correction is to reduce the skin extruder temperature by 5–10 °C or to increase the die temperature to align pressure drop across the layers. Heat-seal strength is determined according to ASTM F88/F88M-21. Seal strength increases with sealing temperature until a plateau is reached approximately 20–25 °C above seal initiation temperature. Failure in coextruded structures is typically cohesive in the interlayer region rather than adhesive at the sealant interface. Food-contact applications require verification against the compliance framework shown in the table.
| Framework | Designation | Limits or conditions |
|---|---|---|
| U.S. FDA | 21 CFR 177.1350 | Ethylene-vinyl acetate copolymers with VA content not more than 8 wt%; use per 21 CFR 174.5 |
| European Union | EU 10/2011 | Overall migration limit 10 mg/dm² for food contact; vinyl acetate SML 12 mg/kg food simulant |
| REACH | 1907/2006/EC | Article compliance requires no SVHC above 0.1 wt% in the homogeneous material |
| RoHS | 2011/65/EU | Pb 0.1 wt%, Cd 0.01 wt%, Hg 0.1 wt% in homogeneous layer |
EVA 4.5/0.5 is used as a polyolefin masterbatch carrier where the slight polarity of 4.5 wt% vinyl acetate improves pigment uptake compared with LDPE without the feed-zone tackiness reported with high-VA carriers. On co-rotating twin-screw extruders with L/D 44:1 and side-fed carbon black, the carrier is dosed at 40–60 wt% of the formulation. Dispersion quality is checked according to ISO 11420 or EN 13900-6. Unfiltered agglomerates above 20 µm indicate insufficient specific energy input or poor side-feed incorporation. The carrier melt flow should be within ±0.2 g/10 min of the target dilution resin to prevent visual streaks in thin-gauge film. If the dilution resin is a high-load LLDPE, the low-MI EVA may require a 5–10 °C higher melt temperature to equalize viscosity in the final blend. This segment is an established practice; additional process elaboration is not required.
Triple-bubble orientation lines converting 35–60 µm collation shrink film obtain a narrower transverse shrink window when EVA 4.5/0.5 is blended with LDPE at 20–30 wt%. The biaxial orientation stage is set between 115 °C and 122 °C, with machine-direction stretch ratios of 4.0:1–5.0:1 and transverse stretch ratios of 4.5:1–5.5:1. The 0.5 g/10 min melt index resists melt relaxation, so the oriented film retains a higher shrink force when tested according to ISO 14616:1997. Above 30 wt% EVA, the film becomes too extensible in the machine direction and can tear at the orientation clamps. Below 10 wt% EVA, the shrink initiation temperature shifts upward and approaches the LDPE crystalline melting point, causing uneven gauge and local lock-out. The triple-bubble process requires that the conditioning zone be held below 80 °C to prevent premature relaxation of oriented vinyl acetate segments. Production-scale experience indicates that the primary bottleneck is not film formation but trim recovery; the low-VA EVA increases film toughness, which may raise granulator motor load compared with LDPE-only trim. Published data for this specific blend configuration is limited.
Extruded cable bedding compounds incorporate EVA 4.5/0.5 into LLDPE at 20–30 wt% where the finished cable must meet environmental stress-cracking resistance under ASTM D1693-15. The vinyl acetate units alter tie-molecule density in the amorphous phase and slow slow-crack growth. Comparative ESCR data for PE-EVA blends show that adding 4.5 wt% VA can increase notched failure time by an order of magnitude relative to the base LLDPE, but the exact improvement depends on comonomer type, cooling rate and thermal history. A Maddock mixing section is required in the single-screw extruder to disperse the EVA without excessive shear heating. Screw speeds are normally limited to 60–90 min⁻¹ for 45–65 mm extruders to maintain melt temperature below 200 °C. Carbon black masterbatch is added through the hopper at 2.5–5.0 wt%. The final compound is extruded through a tubing die with a draw ratio of 1.2:1–1.6:1 to avoid frozen-in stress. The use of EVA in cable bedding is not suitable for high-voltage insulation contact because dielectric losses increase with polar vinyl acetate groups.
Three-layer steel pipe coating lines use a low-MI LDPE/EVA blend for the outer sheath when low-temperature flexural stress and resistance to rock damage are specified. EVA 4.5/0.5 is let down at 15–25 wt% into LDPE. The extruder is typically a 75–90 mm smooth-bore single screw with L/D 30:1, a 20/40/60 mesh screen pack, and a crosshead die. Melt temperature is limited to 195 °C. The low MI gives the extrudate sufficient sag resistance for thick layers of 2.5–4.0 mm on large-diameter pipe. The outer sheath must pass indentation hardness and bend tests specified in ISO 21809-1:2018. A reduced draw distance between the die exit and the water quench is maintained to limit orientation and residual stress in the coating. The use of a fine-mesh screen pack is required to remove carbon gel particles; extruder head pressure should be monitored continuously. This configuration is not recommended for small-diameter tube coating because the 0.5 g/10 min melt index can cause excessive head pressure on narrow die passages.
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SINOPEC Sanren EVA 4.5/0.5 is an ethylene-vinyl acetate copolymer grade whose product designation is decoded as a nominal melt mass-flow rate of 4.5 g/10 min and a nominal vinyl acetate comonomer content of 0.5 wt%. The grade belongs to the low-vinyl-acetate EVA class, in which the comonomer is present at a level sufficient to modify crystalline regularity and surface polarity but not sufficient to produce the low melting points, high polarity, and elastomeric character of EVA grades containing 14% to 28% vinyl acetate. The structural effect of 0.5 wt% vinyl acetate is an incremental disruption of the polyethylene crystal lattice; the material therefore retains an orthorhombic crystalline phase with a melting range close to low-density polyethylene rather than the broad melting endotherm of high-VA EVA.
Because the vinyl acetate content is low, the resin exhibits LDPE-like stiffness and thermal resistance while offering a small improvement in surface polarity, printability, and adhesion to certain polar substrates. This property balance places the grade in thin-gauge film, coextruded sealant layers, extrusion coating, and blends with LDPE where a slight reduction in crystallinity is required without the acetic acid volatility and thermal instability associated with higher-VA copolymers. The grade is not intended for hot-melt adhesives, low-temperature flexible foam, or highly polar filled compounds where a higher vinyl acetate content is required.
As a low-VA EVA, the material retains a relatively sharp melting peak and a narrow sealing window compared to ionomers or high-VA grades. The melt flow rate of 4.5 g/10 min provides moderate processability in blown film and cast film without the elevated melt strength of fractional-melt LDPE; this makes melt temperature control and die geometry selection material-specific rather than merely equipment-default.
Lot release data for this product class are generated under standardised thermal and mechanical methods. Melt mass-flow rate is determined according to ISO 1133-1:2022 or ASTM D1238-23 at 190 °C under 2.16 kg load; the grade designation itself carries the nominal 4.5 g/10 min value, but inter-laboratory variation and drying state should be confirmed on the certificate of analysis. Density is measured by ISO 1183-1:2019 after conditioning at 23 °C ± 2 °C. Tensile properties are recorded on compression-moulded plaques using ISO 527-2:2012 Type 5A specimens at 500 mm/min, while optical haze is assessed on blown film according to ASTM D1003-21. Vicat softening temperature is reported under ISO 306:2013 method A50 using a 10 N load and 50 °C/h heating rate.
| Property | Test condition / standard | Representative range for this grade class |
|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 / ASTM D1238-23, 190 °C / 2.16 kg | 4.5 g/10 min |
| Vinyl acetate content | Internal FTIR or saponification method | 0.5 wt% |
| Density | ISO 1183-1:2019, 23 °C | 0.920–0.924 g/cm³ |
| Tensile stress at break | ISO 527-2:2012, Type 5A, 500 mm/min | 15–20 MPa |
| Tensile strain at break | ISO 527-2:2012, Type 5A, 500 mm/min | 400–600% |
| Vicat softening temperature | ISO 306:2013, method A50 | 90–95 °C |
| Melting peak temperature | ISO 11357-3:2018, 10 °C/min | 108–112 °C |
| Film haze | ASTM D1003-21, 50 µm film | 5–10% |
The tabulated values are representative of the low-vinyl-acetate EVA class and are not a substitute for lot-specific certification. The lower vinyl acetate content preserves a melt peak near 108–112 °C; this is significantly above the 85–95 °C melt peaks of 14–18% VA grades. Consequently, heat-seal initiation is shifted upward, and hot-tack strength at low temperatures is lower than for high-VA sealant resins.
On a production-scale cast-film line using a 75 mm single-screw extruder with L/D 30:1 and a barrier screw equipped with a Maddock mixing section, a barrel temperature profile from 150 °C in the feed zone to 180 °C in the metering zone is typical for this grade; adapter and die temperatures are held at 180 °C to 185 °C. Melt temperature is kept below 210 °C because vinyl acetate units begin to hydrolyse at sustained temperatures above 200 °C, and liberated acetic acid can corrode unprotected downstream equipment and create odour or film surface defects. At temperatures above 220 °C, chain scission and crosslinking also compete, increasing gel counts and reducing die-lip build-up control. The field-observable result of prolonged residence time above 210 °C is a rise in screen pressure and an increase in specks in thin film; therefore, melt residence time above 200 °C should be limited to under 5 min.
For blown-film processing, die gap selection between 1.5 mm and 2.5 mm is used. The lower-VA EVA can sustain a blow-up ratio of 2.0:1 to 3.0:1, but bubble stability is lower than that of fractional-melt LDPE. Frost line height is generally maintained at 4 to 8 die diameters; excessive frost line height increases transverse direction orientation and gauge nonuniformity. In production trials, gauge variation of ±6% has been observed when the frost line is held at 4–5 die diameters on a 55 mm extruder with L/D 28:1 and a 200 mm die. This variation widens when the frost line is moved beyond 8 die diameters, indicating that the processing window for low-VA EVA is not as broad as for LDPE homopolymer.
Injection molding is possible for thin-wall closures and containers, but published data for this specific configuration is limited. A melt temperature of 170–200 °C and a mould temperature of 20–40 °C are common for low-VA EVA. Clamp force of 3.5–4.5 kN/cm² of projected area is typical for this MFI class. The material has a higher melt viscosity than EVA 28/25 at the same shear rate because the higher vinyl acetate content in the latter sharply reduces melt viscosity; therefore, filling long flow paths or thin sections may require increased injection pressure or higher melt temperature within the safe degradation limit.
The low quantity of vinyl acetate does not eliminate the long-chain branching distribution of the high-pressure polymerisation route. The molecular weight distribution and long-chain branch content are the primary rheological controls. A broad molecular weight distribution assists shear thinning; therefore the apparent viscosity at 100 s⁻¹ is considerably lower than the zero-shear value. Certificates of analysis may report apparent melt viscosity by ISO 11443:2014 at 190 °C and 100 s⁻¹; comparative lot data are more useful than single-point values for detecting batch-to-batch variation.
Replacement of a 14% or 18% VA sealant resin by 0.5% VA EVA changes the seal initiation temperature, hot-tack envelope, and interfacial adhesion. The low-VA grade does not melt below 100 °C in the same manner as high-VA grades; consequently, packaging lines running at seal bar temperatures below 120 °C may fail to achieve acceptable seal strength. On a hot-bar sealer set at 115 °C, the seal strength of the low-VA grade is expected to be marginal compared with an EVA 14/2 sealant; the exact value depends on film thickness, pressure, and dwell time, and published data for this specific configuration is limited. The material also develops less hot tack, so high-speed vertical form-fill-seal operations with short cooling times should not treat this resin as a drop-in replacement for high-VA sealants.
Adhesion to polar barrier layers such as polyamide, ethylene-vinyl alcohol, or polyester is lower because the 0.5 wt% VA content supplies only a small concentration of acetate groups to the interface. In coextruded structures, maleic anhydride-grafted tie layers or an additional EVA-rich tie resin are required. The product is not an acid-copolymer or ionomer; it does not form hydrogen bonds to aluminium foil and should not be used as a sole foil-bonding layer. Corona treatment of film surfaces can improve ink and coating adhesion, but the effect is less pronounced than on oxidised polyethylene film.
The melt strength of this grade is governed by the combination of long-chain branching, broad molecular weight distribution, and the low vinyl acetate content. At die lip temperatures below 170 °C, melt strength is sufficient to stabilise a bubble at blow-up ratios up to 3.0:1; above 190 °C, the same bubble may show neck-in and instability because the elongational viscosity drops. Draw resonance in cast film becomes more probable at high line speed when the draw ratio exceeds a critical value that is a function of die gap and melt temperature; for this grade, lowering melt temperature from 200 °C to 180 °C delays draw resonance onset, but the exact threshold should be determined on the target line because published data for this specific configuration is limited.
A die gap of 2.5 mm improves bubble symmetry and reduces gauge variation compared with a 1.0 mm die gap at the same blown film output, although it increases melt residence time. The selection of a larger die gap is therefore appropriate for films below 50 µm when gauge uniformity is critical; for films above 100 µm, a smaller die gap may be used if the extruder output is high enough to maintain drawdown without excessive shear heating.
Because the comonomer content is only 0.5 wt%, the crystallisation half-time is shorter than for 14% VA EVA. Rapid crystallisation reduces the time available for molecular orientation to relax and can increase haze if cooling is too slow. For films below 30 µm, line speed and air ring temperature must be set to produce a fine spherulitic structure; otherwise, large spherulites scatter visible light and increase ASTM D1003-21 haze.
On cast-film lines, die-lip deposit formation is monitored by visual inspection and by the frequency of edge trim breaks. The low VA content means that acetic acid generation is much lower than for EVA 14/2 or 28/25, but a small amount of acetate volatiles can still condense on the air knife and die lips. A stainless-steel or chrome-plated die is recommended because condensed acetic acid on bare carbon steel produces localised pitting over multi-week campaigns. Gel contamination is typically monitored as screen pack pressure rise across a 90/200/90 mesh pack; a pressure rise greater than 15 bar within 8 h can indicate an unacceptable crosslinked contaminant level or thermal degradation during processing.
The principal differentiation is vinyl acetate content and its effect on crystallinity, melting point, polarity, and thermal stability. EVA 14/2 has a vinyl acetate content of 14% and a melt flow rate of 2 g/10 min; its melting point is lower, its low-temperature flexibility is greater, and its seal initiation is lower than the 0.5% VA product. EVA 28/25 combines 28% VA with a melt flow rate of 25 g/10 min; its melt viscosity is substantially lower, and it is used in hot-melt adhesive compounding where the present grade would create excessive viscosity and insufficient substrate wetting.
Compared with metallocene-catalysed ethylene-α-olefin plastomers, the EVA 4.5/0.5 contains a polar comonomer that provides slightly higher surface energy and better ink adhesion than non-polar ethylene-octene or ethylene-butene copolymers. It does not, however, match the low-temperature impact, elastic recovery, or optical clarity of metallocene plastomers at equivalent density. The low-VA product is also less shear-sensitive than high-VA EVA and more similar to LDPE in extrusion pressure response.
Regulatory documentation should confirm the following:
| Requirement | Standard or clause | Comment |
|---|---|---|
| Food-contact resin status | 21 CFR 177.1520 (c) 2.2 | Applies only if formulation and end-use migration testing support the intended use |
| EU food-contact framework | EU Regulation 10/2011 Annex I | Overall migration limit 10 mg/dm² for plastic food-contact articles |
| RoHS restricted substances | Directive 2011/65/EU Annex II | Lead, mercury, cadmium, hexavalent chromium, PBBs, PBDEs not above threshold |
| REACH SVHC communication | EC 1907/2006 Article 33 | No SVHC above 0.1% w/w to be declared if confirmed by supplier documentation |
Proper storage of the resin is in sealed original packaging at 5–40 °C and below 70% RH. Pre-drying is generally unnecessary if the packaging remains intact; if condensation occurs, drying at 60–65 °C for 2 h in a dehumidified air dryer is sufficient. Avoid storage in direct sunlight and contact with oxidising agents. The resin should not be blended with amine-based antistatic additives or certain transition-metal stearates without prior screening, because these can accelerate thermo-oxidative degradation or discolouration at processing temperatures. Prolonged processing above 210 °C should be avoided unless the line has stainless-steel or acid-resistant venting and scrubbing to handle trace acetic acid. The product is not intended for applications requiring high vinyl acetate content, high tack, low-temperature flexibility, or covalent adhesion to metal and polar barrier layers.
