| HS Code | 692291 |
| Product | SINOPEC Sanren EVA 15/2 |
| Va Content | 15 wt% |
| Melt Flow Rate | 2 g/10min |
| Density | 0.935 g/cm3 |
| Melting Point | 88 °C |
| Vicat Softening Point | 65 °C |
| Tensile Strength | 20 MPa |
| Elongation At Break | 700% |
| Hardness | Shore A 93 |
| Brittle Temperature | -70 °C |
As an accredited SINOPEC Sanren EVA 15/2 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SINOPEC Sanren EVA 15/2 is supplied in 25 kg net kraft paper bags with PE inner liner, palletized and stretch-wrapped. |
| Container Loading (20′ FCL) | 20′ FCL: SINOPEC Sanren EVA 15/2 loaded in sealed containers, stacked securely, protected from moisture and direct sunlight. |
| Shipping | SINOPEC Sanren EVA 15/2 is a non-hazardous ethylene-vinyl acetate copolymer resin, shipped in sealed packaging to prevent moisture and contamination. It transports safely by truck, rail, or sea in clean, dry containers. Avoid exposure to high heat and direct sunlight during transit to maintain product quality. |
| Storage | Store SINOPEC Sanren EVA 15/2 resin in a cool, dry, well-ventilated area away from direct sunlight, heat, and open flames. Keep containers tightly sealed to prevent moisture pickup and contamination. Avoid exposure to strong oxidizers. Maintain good housekeeping to minimize dust accumulation. No special temperature control required, but storage should be dry and protected from mechanical damage. |
| Shelf Life | Shelf life is typically two years from manufacture date when stored unopened in cool, dry conditions. |
Where a 15 wt% vinyl acetate ethylene copolymer is directed into three-layer blown-film structures, the primary function is not tack or sealability but controlled disruption of polyethylene crystallinity. In greenhouse covering films, SINOPEC Sanren EVA 15/2 is blended at 10–25 wt% into the middle layer of an LLDPE/LDPE coextrusion. The vinyl acetate comonomer reduces the crystalline fraction, shifting haze to values below 10% on 200 µm film when measured by ASTM D1003-21. Because the melt flow rate is 2.0 g/10 min under ISO 1133-1:2022 conditions of 190 °C and 2.16 kg, head pressure is higher than with film-grade LDPE; blown-film equipment should be configured with a grooved feed section, an L/D of at least 30:1, and a barrier screw. Die gaps between 1.6 mm and 2.2 mm are used, with blow-up ratios from 2.0:1 to 2.8:1. The thermal processing window should remain between 185 °C and 215 °C. Above 230 °C, vinyl acetate decomposition releases acetic acid, causing die lip corrosion and microgel formation on the bubble. In regions with relative humidity above 60%, pre-drying at 70 °C for 2 h is required to prevent moisture-induced bubble instability. Compared with LDPE film, tear propagation measured by ISO 6383-2 improves because the amorphous vinyl acetate phase absorbs tear energy. The higher amorphous fraction also lowers low-temperature brittleness; film can remain flexible below -20 °C when the EVA layer is correctly positioned. Slip and antiblocking packages based on erucamide or oleamide are added at 500–1500 ppm to prevent roll blocking caused by the tackier vinyl acetate surface. Long-term ultraviolet stabilisation must be provided by HALS and UV absorbers; sulfur-containing agrochemical drainage can accelerate photochemical degradation of ethylene-vinyl acetate films and requires an appropriate HALS package. The exact property shift must be confirmed on the production line because film cooling rate and frost-line height influence crystallinity and optical performance.
In crosslinked midsole production, SINOPEC Sanren EVA 15/2 is milled with azodicarbonamide, dicumyl peroxide, zinc oxide or zinc stearate, and calcium carbonate. The processing conflict arises because dicumyl peroxide generates radicals for crosslinking while azodicarbonamide simultaneously releases nitrogen. If the press temperature exceeds the blowing agent decomposition range before adequate gelation, escaping gas collapses the cell structure. If crosslinking overtakes gas expansion, rupture of cell walls produces split treads and internal blowholes. Industrial starting points use 0.8–1.2 phr dicumyl peroxide, 2.8–4.0 phr activated azodicarbonamide, 1.0–1.5 phr zinc stearate, and 10–25 phr calcium carbonate. Milling on a two-roll mill is carried out at 100–110 °C; batch times above 12 min can pre-scorch the stock if dicumyl peroxide has been added. Compression presses are set to 165–170 °C with mould holding pressure of 150–200 kg/cm². Cure time follows 8–12 min per cm of maximum part thickness. The resulting foam density typically falls in the 0.12–0.20 g/cm³ range, with split tear tested by ASTM D3574-17 and compression set by ASTM D395-18. Because the melt index of 2.0 g/10 min is lower than many foam grades, injection foaming units require higher injection pressure and are limited to thicker runners; published data for this specific configuration is limited, and laboratory-scale density checks are required before serial production. The 15 wt% vinyl acetate content is lower than the typical 18–28 wt% EVA foam range, which increases foam hardness and reduces cold flexibility; finished midsoles may require additional softener or blending with higher-VA EVA to achieve shore hardness targets.
In industrial packaging adhesive lines, the low vinyl acetate content of 15 wt% shifts performance away from pressure-sensitive tack toward heat-resistant cohesive strength. SINOPEC Sanren EVA 15/2 can be used in EVA/wax/tackifier systems for case and carton sealing where adhesive lines run at 150–170 °C and require an open time of 3–6 s. The low melt index of 2.0 g/10 min under ISO 1133-1:2022 means that melt viscosity remains high; therefore, formulation with microcrystalline wax or Fischer-Tropsch wax at 15–25 wt% is required to lower application viscosity without eliminating heat resistance. Hydrogenated C5 or C9 tackifiers at 30–40 wt% provide substrate wetting on recycled corrugated board. Process limits exist: formulations containing paraffin wax above 18 wt% may phase-separate during open-time crystallisation, producing surface bloom and reducing fibre tear. Because the vinyl acetate content is below the standard hot-melt adhesives range of 18–28 wt%, adhesion to untreated LDPE film is weak and corona treatment is required for laminate bonding. Viscosity stability at 170 °C should be checked over 24 h; darkening or viscosity drift indicates deacetylation in the presence of acidic tackifiers. This low-VA grade is therefore positioned as a heat-resistant modifier in packaging adhesives rather than a sole adhesive base. Applied adhesive films solidify by crystallisation rather than solvent evaporation, which allows immediate case stacking but limits penetration into coated board grades.
LSZH compounds for IEC 60332-1 cable constructions typically require a polyolefin matrix filled with 120–180 phr magnesium hydroxide or aluminium trihydrate. SINOPEC Sanren EVA 15/2 is added at 20–40 wt% of the polymer fraction because the vinyl acetate groups improve filler wetting and reduce melt fracture in highly filled systems. Melt compounding is performed on a co-rotating twin-screw extruder with 36:1 L/D, side stuffing of filler after polymer melting, and pelletising by underwater die face at 160–180 °C. The low melt flow rate of 2.0 g/10 min raises specific energy input; screw designs with high distributive mixing sections and preheated feed are used to prevent filler agglomeration. Moisture control is critical because magnesium hydroxide absorbs water above 60% RH; the compound should be pre-dried at 70–80 °C for 3–4 h before extrusion.
| Test standard | Parameter | Typical industrial requirement | Relevance for EVA 15/2 compounds |
|---|---|---|---|
| IEC 60754-2 | Halogen acid gas | <0.5% HCl equivalent | EVA is halogen-free; additives must be screened for halogens |
| IEC 61034-2 | Smoke density | light transmittance >60% in 3 m cube | High filler loading required; EVA reduces smoke release versus PE |
| ISO 4589-2 | Oxygen index | >30% O₂ | Mg(OH)₂ or ATH required; EVA acts as char-forming polymer |
| IEC 60332-1 | Flame spread | char length <425 mm | Compound must be crosslinked or reinforced |
| ISO 1133-1:2022 | Melt flow rate | as specified | 2.0 g/10 min for raw EVA; compound MFR after filler drops below 0.5 g/10 min |
Zinc borate or antimony trioxide can act as synergistic flame retardants, but EVA 15/2 compounds should be tested for acid scavenger consumption because magnesium hydroxide dehydroxylation begins near 340 °C and does not mask early acetic acid release if the extruder zone is miscontrolled above 230 °C. Crosslinked jacketing compounds may use silane grafting or peroxide cure; peroxide cure requires the dicumyl peroxide addition to be staged after filler dispersion to avoid excessive pre-cure during pelletising.
Process conditions for injection moulding differ from film because the melt is injected into a cold cavity and the part must solidify without sink marks. SINOPEC Sanren EVA 15/2 can be moulded into grommets, bellows, anti-vibration pads, and footwear components using a general-purpose screw with a compression ratio of 2.5:1 to 3.0:1. Barrel temperature settings from feed to nozzle are 150–160 °C, 160–170 °C, 170–180 °C, and 180–190 °C; mould temperatures are kept at 20–40 °C because higher mould temperatures slow crystallisation and increase cycle time. Injection speed should be high to prevent flow marks on thin-walled sections; otherwise the low melt flow rate produces jetting and weld-line weakness. Melt cushion is maintained at 3–5 mm; back pressure at 5–10 bar avoids air entrapment. Mould shrinkage must be determined by ISO 294-4:2018 and is usually in the 1.5–2.5% range for isotropic parts. Because the material contains vinyl acetate, prolonged residence time above 220 °C generates acetic acid, which can etch mould surfaces; mould steels should be stainless or hard-chromed. Parts exposed to direct UV need carbon black loading of 2–3 wt% or UV stabiliser packages; unpigmented EVA will chalk and lose flexibility. Dimensional stability in this grade is inferior to semi-crystalline homopolymers but sufficient for flexible boots and seals; published data for this specific configuration is limited, and mould trials are required for production tooling.
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Sinopec Sanren EVA 15/2 is an ethylene-vinyl acetate copolymer produced by high-pressure continuous polymerization. The grade designation encodes two nominal design values: a vinyl acetate comonomer content of 15 wt% and a melt mass-flow rate of 2 g/10 min when determined at 190 °C under a 2.16 kg piston load using ISO 1133-1:2022 or ASTM D1238-20. This compositional position places the material in the low-melt-flow band of the EVA product range, giving it higher melt viscosity, higher melt strength, and lower drawdown than grades carrying nominal melt flow rates of 5–25 g/10 min at equivalent vinyl acetate content. Because vinyl acetate disrupts polyethylene crystallinity, the copolymer exhibits a lower crystalline melting range, reduced stiffness, and increased polarity relative to LDPE homopolymer, while retaining higher thermal resistance and lower tack than EVA copolymers with 25–33 wt% vinyl acetate. The resin is supplied in pellet form for film extrusion, coating, compounding, adhesive formulation, and injection moulding operations where moderate polarity and melt strength are process-critical.
The following table compiles the nominal property window reported for EVA copolymers of this composition. The values are not lot-specific release limits for a particular SINOPEC Sanren campaign; supplier certificates of analysis control actual shipments against the relevant test methods.
| Parameter | Test method | EVA 15/2 | EVA 18/3 | EVA 28/05 |
| Vinyl acetate content | Internal FTIR or titration | 14–16 wt% | 17–19 wt% | 27–29 wt% |
| Melt mass-flow rate | ISO 1133-1:2022, 190 °C/2.16 kg | 1.8–2.2 g/10 min | 2.8–3.2 g/10 min | 4.5–5.5 g/10 min |
| Density at 23 °C | ISO 1183-1:2019 | 0.936–0.940 g/cm³ | 0.938–0.942 g/cm³ | 0.950–0.955 g/cm³ |
| Tensile stress at break | ISO 527-2:2012, type 5A, 500 mm/min | 12–18 MPa | 10–15 MPa | 8–12 MPa |
| Elongation at break | ISO 527-2:2012 | 600–750% | 650–800% | 700–900% |
| Flexural modulus | ISO 178:2019, 2 mm/min | 60–90 MPa | 50–80 MPa | 20–40 MPa |
| Vicat softening temperature A50 | ISO 306:2022 | 65–75 °C | 60–70 °C | 40–50 °C |
| Shore D hardness | ISO 868:2003 | 34–40 | 30–36 | 22–27 |
| Melting endotherm peak | ISO 11357-3:2018, 10 K/min | 90–95 °C | 85–90 °C | 65–72 °C |
Relative to LDPE, the vinyl acetate segments lower the crystalline melting point, broaden the melting endotherm, and raise the coefficient of friction against polar substrates. The density of EVA 15/2 is higher than LDPE by roughly 0.015–0.025 g/cm³, which affects package yield calculations. Relative to a nominal 18 wt% VA grade with 3 g/10 min MFR, the 15/2 designation is associated with a melt temperature approximately 5–7 K higher and a Vicat softening temperature approximately 5 K higher, while adhesive wetting on aluminium and polyester film decreases. Peroxide crosslinking of higher-VA EVA grades is described by cure rheometer torque curves; for 15/2, the lower VA content reduces crosslinkable sites per chain, and the low MFR increases scorch time at typical photovoltaic encapsulant curing temperatures of 140–150 °C. This makes the grade unsuitable for standard photovoltaic encapsulation but relevant for compounds where excessive crosslinking would cause brittleness. The property window positions the product for monolayer and coextruded films, hot-melt adhesives with higher cohesive strength, and impact modification of polyolefin compounds.
On single-screw extruders with 25:1 L/D, a barrier screw with mixing pins and a grooved feed section is commonly used for low-MFR EVA resins; barrel zone setpoints from feed to die are typically 150 °C, 165 °C, 180 °C, and 190 °C, with melt temperature held at 190–200 °C. Screw cooling may be required when throughput exceeds the melting capacity of a 25:1 L/D screw; overheating in the compression zone is observed as melt temperature overshoot above 210 °C. Head pressure typically remains between 10 MPa and 30 MPa depending on die gap and screen pack condition; a rapid pressure increase indicates gel accumulation or plugged screens. The die temperature is maintained within ±5 °C of 190 °C because excessive residence time above 210 °C accelerates deacetylation, releasing acetic acid and producing gel particles. Blown-film processing uses a die gap of 0.8–1.2 mm, blow-up ratio 2.0–2.5, and frost line height of 3–5 die diameters. The low MFR provides bubble stability at these conditions, but drawdown is lower than EVA grades with MFR 5–10 g/10 min; edge instability may occur if the film is drawn below 50 µm at high line speed. Cast-film and extrusion-coating lines benefit from a chill-roll temperature of 15–25 °C and an air gap of 50–100 mm. For extrusion coating onto paper or aluminium foil, melt temperatures up to 220 °C may be used only with short hold-up and corrosion-resistant barrel metallurgy; sustained operation above 230 °C is not recommended. Batch-to-batch variation in VA content within 1 wt% shifts the melt temperature and adhesion; on-site Fourier transform infrared analysis of each lot is advised before sequential coextrusion with polar barrier layers. Published data for this specific configuration is limited; extruder trials are required to establish the exact output-stability curve.
Coextruded film and sheet structures exploit the moderate adhesion of EVA 15/2 to ionomer, polyamide, and polyester tie layers. When the resin is used as a sealant layer in multilayer packaging, heat-seal strength is measured by ASTM F88/F88M-21; a seal initiation temperature near 85–95 °C is typical for this VA content, but the exact value depends on film thickness and sealing pressure. The low MFR can delay sealant flow into rough paper surfaces; higher seal-bar pressure or a thin coextruded skin of a higher-MFR EVA may be used to compensate. In lamination, melt temperature should not exceed 220 °C when high-slip and anti-block additives are absent, because adhesive failure at the metal-polymer interface can result from acetic acid accumulation at the boundary layer.
For injection moulding of parts based on EVA 15/2, melt temperatures between 170 °C and 200 °C and mould temperatures of 20–40 °C are used. Injection pressure is typically 60–100 MPa; hold pressure is set to 50–70% of injection pressure to avoid overpacking in low-modulus mouldings. Clamp force requirements are moderate because EVA has a low solid-state modulus; hydraulic pressure settings are lower than those used for semi-crystalline polypropylene. The low MFR increases filling pressure at thin-wall sections; parts with flow length-to-thickness ratios above 150:1 may require gate temperatures above 200 °C or a higher-MFR EVA grade. Pre-drying at 60–70 °C for 2–4 hours is necessary when surface moisture exceeds 0.05 wt% because moisture hydrolysis of vinyl acetate residues can generate acetic acid during melt processing, producing splay and a vinegary odour. Regrind addition should be limited to 20 wt% unless thermal stabilizer supplementation is performed; repeated high-temperature histories increase the acid number and lower the stabilizer active content. Conditioned storage at relative humidity above 60% is not recommended unless drying is installed. Mould release is generally achieved without external lubricants at mould temperatures below 40 °C; above this temperature, surface tack increases and may require an internal release additive. Observed failure modes on production-scale lines include gate-stringing, sticking in the mould, and gloss variation when barrel temperatures exceed 210 °C.
Hot-melt adhesive formulations based on EVA 15/2 typically contain a tackifier resin such as a C5/C9 aliphatic-aromatic hydrocarbon resin and a paraffin or microcrystalline wax. The low MFR contributes cohesive strength and heat resistance to the final blend; however, it also increases melt viscosity at application temperatures of 160–180 °C. Formulators targeting low application viscosity generally select EVA with 28 wt% VA and MFR 5–25 g/10 min. When the 15/2 resin is used in polymer modification of polypropylene or polyethylene, addition levels of 5–20 wt% are examined in twin-screw compounding. At 10 wt% loading in a polyolefin matrix, the EVA phase lowers flexural modulus and increases room-temperature impact energy, as measured by ISO 179-1:2010 Charpy notched impact; the exact shift in ductile-brittle transition depends on matrix molecular weight and interphase adhesion. The morphology is typically a dispersed EVA domain of 0.5–2.0 µm when compounded on a co-rotating twin-screw extruder with 40:1 L/D and moderate shear residence. For masterbatch carrier applications, the VA content improves pigment wetting and dispersion at loadings of 40–60 wt% pigment; however, torque rheometer screening at 190 °C and 60 rpm is the standard method for assessing wetting curves. Incompatibility with basic amine slip agents and antistatic additives should be evaluated because residual acetic acid can protonate amine sites, reducing additive efficiency. Avoid simultaneous use of calcium oxide desiccants in moisture-sensitive compounds without verifying the acid-absorption capacity and its effect on long-term stabilizer retention.
In comparison with EVA 18/3, the 15/2 grade produces less adhesion to aluminium and PET but higher temperature resistance; in comparison with EVA 28/05, it shows lower transparency and requires higher processing temperatures for low-viscosity applications. For tie-layer applications in multi-layer pipes and films, the VA content must be matched to the polar substrate; 15 wt% is generally selected when higher heat resistance is more important than maximum adhesion. In polyolefin impact modification, a 15/2 masterbatch reduces low-temperature impact improvement compared with 28 wt% VA grades, but limits undesirable increase in coefficient of friction and blocking. The selection boundary is usually set by the substrate surface energy and the required upper service temperature.
Thermal degradation of EVA 15/2 under melt-processing conditions proceeds primarily through deacetylation of vinyl acetate groups, generating acetic acid and poly(ethylene-co-acetylene) unsaturation. The acetic acid by-product corrodes carbon steel equipment and can attack downstream metal rolls if not vented. Extruder barrels and screws should therefore be constructed from nitrided steel or stainless steel; copper-containing alloys should be avoided because copper ions catalyse thermo-oxidative degradation. At melt temperatures above 210 °C, deacetylation becomes kinetically significant; residence times above 10 min at 230 °C may produce visible discoloration and a rise in acid number. The exact kinetic constants for this grade are not provided in the public literature; laboratory thermogravimetric analysis under nitrogen at 10 K/min typically shows onset of mass loss near 320 °C for unstabilised EVA, but the onset shifts downward with repeated processing. Commercial EVA pellets contain a primary phenolic antioxidant and a phosphite secondary stabilizer; re-stabilization with 0.05–0.15 wt% of a phenolic/phosphite blend is used when regrind content exceeds 20 wt%. Ventilation is required to remove acetic acid vapour, and air monitoring should be conducted in confined extrusion areas. Purge protocols use LDPE with 2 g/10 min MFR at 160 °C before shutdown; the machine is then cooled under inert gas or closed hopper blanketing to reduce oxidative chain scission. These boundaries constitute the primary operational limits for the resin, not the melting point itself.
Quality control for Sinopec Sanren EVA 15/2 should include melt mass-flow rate verification by ISO 1133-1:2022, vinyl acetate content by Fourier transform infrared spectroscopy calibrated against the supplier method, and density by ISO 1183-1:2019. For food-contact applications, compliance must be evaluated under FDA 21 CFR 177.1350 or EU Regulation (EU) No 10/2011; these frameworks require migration testing with food simulants and are not automatically satisfied by the base resin composition. RoHS and REACH status are addressed through the supplier declaration; downstream users must confirm the presence of any SVHC in the specific additive package. The material is not intended for medical implant or long-term implantable applications. For lot acceptance and process troubleshooting, the acid number after processing is a useful proxy for deacetylation history; values above 1 mg KOH/g may indicate excessive thermal stress or moisture contamination. Published data for this specific configuration is limited.
