| HS Code | 708787 |
| Vinyl Acetate Content | 18 |
| Melt Flow Rate G 10 Min | 0.70 |
| Density G Cm³ | 0.94 |
| Melting Point C | 93 |
| Vicat Softening Point C | 63 |
| Tensile Strength At Break Mpa | 21 |
| Elongation At Break | 750 |
| Flexural Modulus Mpa | 55 |
| Hardness Shore D | 45 |
| Brittleness Temperature C | -100 |
| Glass Transition Temperature C | -30 |
| Crystallinity | 30 |
As an accredited ELVAX 3165SB Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX 3165SB EVA copolymer supplied as free-flowing pellets in 25 kg multi-layer paper bags, palletized and stretch-wrapped. |
| Container Loading (20′ FCL) | ELVAX 3165SB is loaded in 20′ FCL containers, typically packed in sealed bags on pallets, ensuring safe transport. |
| Shipping | ELVAX 3165SB is shipped as a non-hazardous ethylene vinyl acetate copolymer in pellet form. It is packed in moisture-resistant bags or containers, kept dry and away from heat. No special transport classification applies; standard handling prevents dust accumulation and contamination during transit. |
| Storage | Store ELVAX 3165SB 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 exposure to strong oxidizers. Under recommended conditions, shelf life is extended; material remains stable for several years. |
| Shelf Life | Stable for at least two years when stored in original container at room temperature, away from heat and moisture. |
ELVAX 3165SB is an ethylene vinyl acetate copolymer with a nominal 18 wt% vinyl acetate content measured by FTIR according to ASTM D5594-18, a melt flow index of 0.7 g/10 min when tested at 190°C under 2.16 kg load per ISO 1133-1:2022, and a density of 0.94 g/cm³ per ISO 1183-1:2019. The low melt index indicates a high molecular weight fraction that contributes to elevated melt strength, high extensional viscosity, and limited melt sag in downstream conversion. Processing is constrained by the copolymer structure: sustained melt temperatures above 250°C are avoided because deacetylation accelerates above this boundary, as indicated by thermogravimetric analysis under ASTM E1131-08.
In blown film coextrusion of LDPE/EVA sealant webs, 20-30 wt% of ELVAX 3165SB is let down into a low-density polyethylene with a matching melt index of 0.5-1.0 g/10 min to maintain bubble stability. The seal layer is extruded on a three-layer die of 250-400 mm diameter with a die gap of 1.8-2.2 mm. Melt temperatures are held between 210°C and 230°C. Blow-up ratio is set at 2.0:1-2.5:1. The vinyl acetate units disrupt crystallinity and shift the seal initiation temperature below that of unmodified LDPE. Hot tack and seal strength are measured under ASTM F1921-18 and ASTM F88/F88M-21. The finished web enters form-fill-seal packaging for frozen food, snack, and medical pouch formats. Food contact status is supported when the seal layer complies with FDA 21 CFR 177.1350 and Commission Regulation (EU) No 10/2011 with an overall migration limit of 10 mg/dm². The exact seal initiation shift depends on layer ratio, bubble geometry, and corona treatment intensity. Published data for this specific blend configuration is limited; line trials are used to establish the seal temperature curve for each coextrusion setup.
Formulators retain ELVAX 3165SB in high-viscosity assembly adhesives because the low melt flow index is associated with longer macromolecular chains, higher cohesive resistance, and reduced sag at service temperatures above 50°C. A representative edge banding formulation contains 30-35 wt% ELVAX 3165SB, 40-50 wt% hydrocarbon tackifier with a ring-and-ball softening point of 90-110°C, 15-25 wt% Fischer-Tropsch wax, and 0.5-1.0 wt% hindered phenolic antioxidant. Components are melted in a jacketed vertical mixer at 160-180°C. Adhesive is applied with a slot die or roller coater. Because the exact Brookfield Thermosel viscosity of this grade in a finished hot melt is formulation-dependent, published data for the unfilled base polymer are more reliable for screening. Open time and final lap shear are evaluated under ASTM D1002-10(2019) and T-peel is evaluated under ASTM D1876-08(2015). For indirect food packaging uses, the adhesive must satisfy FDA 21 CFR 175.105 and applicable EU Framework Regulation (EC) No 1935/2004. Processors set melt hold times below 8 hours at 180°C to limit viscosity drift from thermal history. The low melt index of the base EVA contributes to torque build in mixing; high-shear dispersion is required to achieve homogeneity.
Addition of ELVAX 3165SB to a halogen-free flame-retardant jacket compound is carried out on a co-rotating twin-screw extruder with an L/D of 44:1. The EVA forms the continuous phase for 150-170 phr of precipitated magnesium hydroxide or alumina trihydrate, with a filler pre-drying step of 4 hours at 80-100°C when ambient relative humidity exceeds 60%. Barrel temperatures are kept in the 130-160°C range because alumina trihydrate releases water of crystallisation above 190°C. Side feeding is used after the polymer melt seal to limit filler attrition. The 0.7 g/10 min melt flow index raises compound viscosity and reduces output relative to EVA grades with higher melt flow index. The jacket line therefore reaches the extruder torque limit before the melt temperature limit. Finished cables are tested under IEC 60332-1-2 for flame propagation, IEC 60754-1 and IEC 60754-2 for halogen acid gas evolution and effluent conductivity, and ASTM D2863-19 for limiting oxygen index. Tensile and elongation after ageing are tested under IEC 60811-501. A limiting oxygen index above 32% is commonly targeted, but published compound-specific data for this grade is limited. The processing boundary is set by the dehydration temperature of the filler, not by the EVA matrix alone.
| Standard code | Test parameter |
|---|---|
| IEC 60332-1-2 | Flame propagation for single insulated wire or cable |
| IEC 60754-1 | Determination of halogen acid gas content |
| IEC 60754-2 | Determination of acidity and conductivity of combustion effluent |
| ASTM D2863-19 | Limiting oxygen index |
| IEC 60811-501 | Tensile and elongation after ageing |
Modification of 70/100 penetration-grade paving bitumen with 3-7 wt% ELVAX 3165SB is performed in a rotor-stator mill at 180°C. Mixing periods of 90-120 minutes are applied to disperse the high-molecular-weight copolymer without exceeding the processing ceiling of 200°C, where bitumen oxidation and EVA deacetylation both accelerate. The copolymer forms a swollen network that raises ring-and-ball softening point and reduces needle penetration. Low-temperature flexibility and elastic recovery are measured under ASTM D6084/D6084M-21, softening point under ASTM D36/D36M-14, and penetration under ASTM D5/D5M-20. Higher melt flow index grades are not used because low-melt-index molecular weight is required for rutting resistance. The modified binder is processed into waterproofing membranes, bridge deck binders, and high-stress overlay mixes. If addition exceeds 8 wt%, phase inversion may occur depending on bitumen source, asphaltene content, and shear history. Published data for the exact copolymer-bitumen interaction is limited because binder performance is source-dependent.
Because die-hole drool and pellet tailing increase when low-viscosity carriers are run at high pigment loadings, ELVAX 3165SB is used as a carrier for additive concentrates in multilayer packaging and geomembrane compounds. Typical pigment concentrates contain 40-50 wt% titanium dioxide or carbon black. The co-rotating twin-screw extruder is operated with an L/D of 40:1 and a water-ring pelletiser. The low melt index carrier raises melt strength and reduces die-hole drool and pellet tailing. Melt temperature is maintained at 190-220°C. No direct food-contact claim is made for the masterbatch unless the final film is certified under the applicable final polymer regulation such as FDA 21 CFR 177.1350 or Commission Regulation (EU) No 10/2011. The carrier is selected for dilution into polyethylene or EVA film; addition rates of 2-5 wt% in the finished article are typical. Published data for this exact masterbatch configuration is limited.
ELVAX 3165SB is compounded at 100 phr with 3-5 phr azodicarbonamide, 0.5-1.0 phr dicumyl peroxide, 1-2 phr zinc oxide, and 20-50 phr calcium carbonate or talc. Mixing is performed in an internal mixer at 110-130°C. The batch is sheeted on a two-roll mill and granulated. Midsoles are compression moulded at 160-180°C. The high melt viscosity and high molecular weight of the 0.7 g/10 min EVA prevent cell coalescence during gas release. Foam density is measured under ISO 845:2006. Tensile and elongation are measured under ISO 1798:2008. Hardness is measured with a Shore A or Asker C durometer. Amine-based additives are excluded from peroxide-cured formulations because they interfere with free-radical decomposition. The final midsoles must comply with footwear restricted substance lists such as REACH Annex XVII and applicable regional limits for azodicarbonamide decomposition products.
In compression-moulded cap liner production, ELVAX 3165SB is blended with LDPE at 20-50 phr, calcium carbonate at 20-40 phr, and a blowing agent at 1-3 phr to obtain a soft, compressible seal. Sheet is calendered to 1-2 mm and die-cut before compression moulding at 160-180°C. Injection moulded closures use hot runner systems with melt temperature 190-210°C. The vinyl acetate content of 18 wt% allows torque retention after repeated cap closing cycles. Sealability is application-specific and is tested under ASTM D638-14 for tensile properties and ASTM D2240-15 for Shore hardness. Food and pharmaceutical closures are cleared when the finished liner complies with FDA 21 CFR 177.1350 and Commission Regulation (EU) No 10/2011, with overall migration below 10 mg/dm². Processors must also verify organoleptic neutrality using sensory testing under EN 1622 or equivalent. Low molecular weight additives must not exceed specific migration limits.
Competitive ELVAX 3165SB Ethylene Vinyl Acetate Copolymer prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615380400285 or mail to sales2@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615380400285
Email: sales2@liwei-chem.com
Flexible payment, competitive price, premium service - Inquire now!
This product identification block applies to ELVAX 3165SB, an ethylene vinyl acetate copolymer resin supplied in pellet form for hot-melt compounding, polymer modification, and crosslinked foam operations. The vinyl acetate comonomer content is 18 wt% when quantified by Fourier transform infrared spectroscopy per ASTM D5594. The melt mass-flow rate is 0.7 g/10 min at 190°C under 2.16 kg load per ASTM D1238; this low value places the grade among the high-molecular-weight, high-melt-strength members of the ELVAX line. Typical density is 0.940 g/cm³ per ASTM D792. The SB suffix identifies a supplier-applied pellet surface treatment that reduces interparticle blocking during silo storage and pneumatic conveying; it does not alter the base copolymer composition. When storage relative humidity exceeds 60%, pre-drying in a desiccant hopper dryer with a dew point below -20°C for 4 h at 65–75°C is recommended before extrusion or injection molding. The resin should not be stored near heat sources exceeding 40°C or exposed to direct ultraviolet light for prolonged periods.
| Specification | Test method | Published nominal value | Unit |
|---|---|---|---|
| Vinyl acetate comonomer content | ASTM D5594 | 18 | wt% |
| Melt mass-flow rate, 190°C/2.16 kg | ASTM D1238 | 0.7 | g/10 min |
| Density | ASTM D792 | 0.940 | g/cm³ |
The 0.7 g/10 min melt mass-flow rate corresponds to higher apparent viscosity than 2.5 g/10 min resin at equivalent shear rates. Single-screw extruders with L/D 24:1 or greater and barrier flight sections are preferred; compression ratios from 2.5:1 to 3.5:1 are common. Feed throat temperature should remain below 40°C to prevent pellet fusion, and barrel zones are typically profiled from 140–160°C in the feed zone, 170–190°C in the compression zone, and 200–220°C in the metering zone. Because vinyl acetate deacetylation accelerates above 230°C, the melt temperature measured at the die should not exceed 230°C for continuous operation; transient excursions to 250°C are restricted to purging. On a 60 mm single-screw line with a 40/80/40 mesh screen pack, head pressure is regularly observed between 120 and 180 bar at 80 kg/h; data for larger line sizes is limited in the published literature. For injection molding, low-compression screw geometry and back pressure of 5–10 bar reduce plasticating time. Mold temperatures from 20 to 40°C are acceptable for non-foamed parts, but thicker walls require core cooling to prevent surface sink.
In hot-melt adhesive compounding, ELVAX 3165SB is combined with rosin ester, C5/C9 hydrocarbon, or terpene phenolic tackifiers in jacketed mixers at 170–190°C. The polymer is added after the wax and tackifier melt to avoid high initial torque and localized oxidative gel. Because the resin’s 0.7 g/10 min melt index elevates final adhesive viscosity, formulations intended for slot-die coating at 160–180°C generally maintain Brookfield Thermosel viscosity between 500 and 2,000 mPa·s at 180°C per ASTM D3236. If this upper boundary is exceeded, paraffin wax or low-molecular-weight polyethylene wax lowers viscosity more effectively than raising temperature. Adhesive substrates are compared by T-peel adhesion on aluminum foil per ASTM D1876 after 24 h conditioning at 23°C and 50% RH. The neat resin has lower adhesion to polar surfaces than a 28 wt% vinyl acetate grade because fewer acetate groups are available for hydrogen bonding to metal oxides and paper fibers.
Addition of 5–20 wt% ELVAX 3165SB to linear low-density polyethylene improves environmental stress-crack resistance and impact toughness in co-rotating twin-screw compounding. An L/D of 40:1 with distributive mixing elements reduces EVA domain size to below 5 µm; tensile properties are measured per ASTM D638 and notched Izod impact per ASTM D256. The viscosity mismatch with LLDPE can cause screw torque overload at the transition zone if the melt temperature is below 190°C; published data for this exact blend configuration is limited.
ELVAX 3165SB is differentiated from ELVAX 3170 by its higher molecular weight at the same nominal 18 wt% vinyl acetate content. The lower melt mass-flow rate of 0.7 g/10 min yields higher die lip pressure and better draw stability for heavy-wall profiles, but it raises mixing torque in batch adhesive equipment. ELVAX 3170 at 2.5 g/10 min is preferred for thin-gauge extrusion coating and slot-die adhesive lines where pump pressure is limited. ELVAX 3180 at 28 wt% vinyl acetate and 25 g/10 min provides higher polarity and lower melt viscosity, but its lower softening point reduces heat resistance in adhesive and foam applications. The following table summarizes the published nominal values.
| Grade | Vinyl acetate wt% | Melt mass-flow rate g/10 min at 190°C/2.16 kg | Processing consequence |
|---|---|---|---|
| ELVAX 3165SB | 18 | 0.7 | High melt strength; high back pressure; preferred for heavy-wall profiles and high-viscosity hot melts. |
| ELVAX 3170 | 18 | 2.5 | Lower viscosity; easier slot-die coating; reduced torque. |
| ELVAX 3180 | 28 | 25 | Higher polarity; lower heat resistance; higher low-temperature flexibility. |
In chemically crosslinked ethylene vinyl acetate foam, ELVAX 3165SB is processed on a two-roll mill with roll surface temperature at 100–110°C. Dicumyl peroxide at 0.5–1.0 phr and azodicarbonamide at 3–5 phr are common starting points for 18 wt% vinyl acetate resin. Cure progress is tracked on a rotorless cure meter per ASTM D5289; the vulcanization torque plateau for this grade is typically reached within 12–15 min at 160°C. Compared with 28 wt% vinyl acetate grades, 3165SB produces higher Shore D hardness per ASTM D2240 and lower compression set per ASTM D395 at equivalent foam density, but its lower polarity reduces compatibility with polar fillers and plasticizers. Expansion pressure must be held above cell growth pressure until the cure state exceeds 90% of maximum torque; premature mold pressure release creates anisotropic cell collapse and surface blisters. Published pressure-time profiles for specific mold geometries are limited.
Compared with ethylene methacrylic acid copolymers, ELVAX 3165SB is not acidic and therefore does not require the same corrosion-resistant tooling, but it also has lower adhesion to aluminum foil and lower oil resistance. The absence of carboxylic acid groups eliminates the risk of reaction with zinc or calcium ions in filler systems; however, adhesion to metal substrates relies on tackifier modification rather than primary acid bonding.
For food-contact adhesive layers, neat ELVAX 3165SB may be evaluated as a component under 21 CFR 177.1350 for ethylene-vinyl acetate copolymers. The finished article is not automatically cleared, because total extractives, migration of tackifiers and waxes, and end-use temperature determine compliance. RoHS 2011/65/EU screening for lead, cadmium, mercury, hexavalent chromium, PBBs, and PBDEs typically reports below detection limits in this polyolefin matrix, but batch-specific certification remains the responsibility of the converter. Avoid combinations with strong oxidizing agents, open flames during purging, and direct contact with copper alloys at temperatures above 200°C, where copper ions catalyze thermal degradation of vinyl acetate segments. REACH registration status is supply-chain specific; downstream users should verify imported substance registrations and candidate list obligations for tackifiers, waxes, and blowing agents rather than treating the neat copolymer as the sole compliance variable.
