| HS Code | 430160 |
| Product | UBE POLYETHYLENE V315 Ethylene Vinyl Acetate Copolymer |
| Vinyl Acetate Content | 15 wt% |
| Density | 0.940 g/cm³ |
| Melt Flow Rate 190 C 2 16 Kg | 15 g/10 min |
| Melting Point | 95 °C |
| Vicat Softening Point | 63 °C |
| Tensile Strength At Break | 20 MPa |
| Elongation At Break | 700 % |
| Flexural Modulus | 60 MPa |
| Hardness Shore D | 40 |
| Brittleness Temperature | -70 °C |
| Volume Resistivity | 1.0e15 Ω·cm |
As an accredited UBE POLYETHYLENE V315 Ethylene Vinyl Acetate Copolymer (UBE) factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | UBE POLYETHYLENE V315 Ethylene Vinyl Acetate Copolymer is packaged in 25 kg polyethylene-lined paper bags for safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL container loading of UBE Polyethylene V315 EVA copolymer, ensuring secure, dry, clean packing and careful handling. |
| Shipping | UBE POLYETHYLENE V315 (EVA copolymer) ships as solid pellets in sealed bags or bulk containers. Ensure clean, dry transport to prevent contamination. Avoid extreme heat and excessive moisture during transit. Not classified as hazardous, but maintain good ventilation. Store away from ignition sources and direct sunlight, preventing physical damage to packaging. |
| Storage | Store UBE POLYETHYLENE V315 (EVA copolymer) in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep containers tightly sealed to prevent moisture contamination and physical damage. Maintain ambient room temperature and avoid stacking excessively. Under proper storage conditions, typical shelf life is one year from receipt. |
| Shelf Life | Shelf life is typically 2 years when stored in a cool, dry area, away from sunlight. Proper packaging maintains quality. |
In hot-melt adhesive compounding for carton side-seam bonding, bookbinding, and case sealing, UBE POLYETHYLENE V315 is introduced as the elastomeric binder phase at 25–35 wt% of the formula. The addition ratio is balanced against a hydrogenated C9 aromatic-modified tackifier at 35–50 wt%, a Fischer-Tropsch paraffin wax with a congealing point between 90 °C and 110 °C at 15–25 wt%, and a hindered phenolic/organophosphite antioxidant system at 0.2–1.0 wt%. Compliance for packaging lines carrying indirect food contact is assessed under FDA 21 CFR 175.105 and FDA 21 CFR 175.125 where the adhesive is functionally separated from food by the substrate; European supply chains additionally reference REACH EC 1907/2006 and the applicable multilayer provisions of EU Regulation 10/2011. Production is performed on a co-rotating twin-screw extruder with L/D between 40:1 and 52:1, using a barrel temperature profile of 120/135/150/165/175/180 °C from feed throat to die and vacuum devolatilization at -0.08 MPa to strip residual vinyl acetate monomer and low-molecular-weight volatiles. The compounded adhesive is pelletized under water ring or underwater strand pelletization, then slot-coated or spiral-spray coated at 150–180 °C. Terminal finished products include corrugated case sealing adhesives, softcover bookbinding adhesives, deep-freeze packaging adhesives, and edge-banding adhesives for furniture panels. At addition above 40 wt% V315, mixing torque rises sharply; die pressure can exceed 8 MPa in a 40:1 extruder, and strand breakage becomes recurrent if die exit temperature falls below 165 °C.
| Formulation component | Low-tack packaging grade | General packaging grade | Deep-freeze grade |
|---|---|---|---|
| UBE POLYETHYLENE V315 | 20 wt% | 30 wt% | 40 wt% |
| Hydrogenated C9 tackifier | 50 wt% | 45 wt% | 35 wt% |
| Fischer-Tropsch wax | 25 wt% | 18 wt% | 15 wt% |
| Antioxidant system | 0.5 wt% | 0.7 wt% | 1.0 wt% |
| Brookfield Thermosel viscosity at 180 °C | 0.8 Pa·s | 1.4 Pa·s | 2.4 Pa·s |
The resin is processed as a sealant layer in multilayer films at 20–100 wt%, with a typical blend of 30–50 wt% V315 and LDPE to balance seal initiation temperature against bubble stability. In a seven-layer blown film line, the sealant extruder is a 45 mm single-screw with a barrier screw and L/D of 30:1, operating at 175–210 °C; die temperature is held at 200–220 °C. The critical boundary is the melt temperature ceiling of 230 °C, above which acetic acid elimination from vinyl acetate units accelerates and may corrode downstream die lips and air ring surfaces. Seal initiation temperature is determined according to ASTM F2029, hot tack by ASTM F1921, and seal strength by ASTM F88/F88M-21; a 15 wt% vinyl acetate layer typically lowers seal initiation by 10–20 °C relative to LDPE. Compliance is established under FDA 21 CFR 177.1350 for ethylene vinyl acetate copolymers in food contact, EU Regulation 10/2011 with overall migration limit 10 mg/dm², and ISO 11607-1:2019 for terminally sterilized medical packaging. Sealant layer thickness is typically 15–25 µm. Terminal finished products include retortable pouches, frozen food pouches, lidding films, and medical device peel pouches.
In crosslinked EVA foam for athletic footwear, V315 is used at 100 phr as the base polymer. Azodicarbonamide exothermic blowing agent is incorporated at 2.0–3.5 phr, dicumyl peroxide at 0.5–0.8 phr, zinc oxide at 1–2 phr, stearic acid at 0.2–0.5 phr, and calcium carbonate at 10–30 phr. The compound is prepared in an internal mixer with two-wing rotors; drop temperature is controlled at 105–120 °C, and the peroxide is added on a two-roll mill at 80–90 °C to prevent premature scorch. The process conflict is the overlap between the dicumyl peroxide crosslinking exotherm and the azodicarbonamide gas generation profile. If the peroxide half-life at 170 °C is too short relative to the expansion rate, cell walls rupture before gelation and produce split midsoles. Compression molding uses a hydraulic press with 15–20 MPa cavity pressure and mould temperature 160–175 °C for 5–8 min. Density reduction ranges from 28–42% depending on blowing agent loading and pressure release rate. Compliance is anchored to REACH EC 1907/2006, ASTM D395-18 for compression set, and ISO 845 for apparent density of cellular plastics. Terminal finished products include EVA midsoles, wedge sandals, footbeds, and children's play mats.
In modification of flexible and semi-rigid PVC, the ethylene vinyl acetate copolymer is introduced at 5–20 phr to reduce processing torque and improve low-temperature crack resistance. The EVA phase is blended in a hot-cold turbo mixer with PVC dry-blend at 80–100 °C hot stage and 40 °C cold stage, then gelated in a conical twin-screw extruder with barrel temperatures 150–175 °C. Compliance for cable sheathing compounds and profile compounds references IEC 60811-501, EN 50363-0, and RoHS 2011/65/EU. Published data for this specific configuration is limited; industrial qualification typically includes tensile testing under ASTM D638-14 and notched Izod impact under ASTM D256. Terminal finished products include impact-modified pipe fittings, cable sheathing compounds, and automotive interior profiles.
For halogen-free flame-retardant jacketing compounds, V315 is incorporated at 30–50 phr of the polymer fraction, with linear low-density polyethylene forming the balance. The filler system comprises precipitated alumina trihydrate or ground magnesium hydroxide at 120–180 phr, a vinyl silane coupling agent at 0.5–1.5 phr, and zinc borate synergist at 10–20 phr. The compound is produced on a co-rotating twin-screw extruder with screw diameter 75 mm and L/D 44:1; barrel temperatures are kept below 170 °C in the filler side-feed zone to prevent release of hydration water. Melt pressure at a screen pack of 150/200 mesh can exceed 10 MPa as filler loading surpasses 150 phr. Extrusion onto cable uses a 90 mm single-screw extruder with L/D 25:1, die temperature 120–150 °C, and line speed reduced by 20–30% relative to PVC jacketing due to melt fracture sensitivity. Compliance is established under IEC 60811-501, UL 1581, EN 50363-0, and RoHS 2011/65/EU. Terminal finished products include low-voltage power cable sheathing, photovoltaic cable jackets, and control cable bedding compounds.
| Property / condition | Filler loading 120 phr | Filler loading 150 phr | Filler loading 180 phr |
|---|---|---|---|
| Melt pressure at 150/200 mesh screen pack | 7.2 MPa | 9.5 MPa | 11.8 MPa |
| Limiting oxygen index | 36% | 39% | 42% |
| Tensile strength after ageing, 168 h at 100 °C | 11.2 MPa | 9.8 MPa | 8.4 MPa |
| Elongation at break after ageing | 180% | 150% | 120% |
When V315 is substituted for LDPE in injection-moulded closure liners, the addition ratio ranges from 70–100 wt% of the liner compound, or a blend of 50/50 V315/LDPE where lower melt viscosity is required. Injection moulding is run on a reciprocating screw machine with clamp force 100–250 tonnes, melt temperature 170–200 °C, and mould temperature held at 10–30 °C. The resin’s higher acetate content lowers the softening point and improves seal conformity against polyethylene terephthalate bottle finishes. Operational boundary: if residence time exceeds 20 min at melt temperature, surface gloss decreases and brown specking appears from thermal decomposition. Compliance for beverage and pharmaceutical closures is evaluated under FDA 21 CFR 177.1350, EU Regulation 10/2011, and ISO 1133-1:2022 for melt mass-flow rate control. Terminal finished products include carbonated soft drink closure liners, oxygen barrier cap seals, pharmaceutical bottle gaskets, and tamper-evident liners for edible oil containers.
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UBE Polyethylene V315 is a high-pressure ethylene-vinyl acetate copolymer supplied by UBE Corporation as pelletised resin for extrusion coating, blown film, injection molding, and masterbatch carrier applications. The grade is typically specified at a nominal vinyl acetate content of 15 wt% and a melt mass-flow rate of approximately 3.0 g/10 min when measured at 190 °C under 2.16 kg load according to ISO 1133-1:2022. The random incorporation of the polar acetate side group into the polyethylene backbone reduces lamellar thickness and overall crystallinity relative to branched low-density polyethylene. Published property ranges for this comonomer class include a density of 0.930–0.940 g/cm³ under ISO 1183-1, a Vicat softening point of 63–70 °C under ISO 306 A50, and tensile elongation at break above 700% under ISO 527-2. The main differentiation from homopolymer low-density polyethylene is the acetate side group, which raises surface polarity, improves adhesion to aluminium foil and paper, increases low-temperature toughness, and lowers heat resistance. Compared with higher-vinyl-acetate EVA copolymers containing 25–33 wt% vinyl acetate, V315 retains higher melt strength, lower moisture uptake, and reduced acetic acid generation during processing, but offers a narrower low-temperature flexibility window and lower adhesion to highly polar substrates such as polyamide and polyvinyl alcohol.
The adhesion improvement of V315 over low-density polyethylene is governed by the concentration and surface migration of acetate groups. The 15 wt% vinyl acetate content increases the polar component of surface energy, but oxidation or corona discharge is still required on polymer film substrates to produce durable bond strength. On extrusion coating lines, corona pretreatment of film substrates to a wetting tension of 38–42 mN/m under ASTM D2578 improves peel performance; aluminium foil requires removal of rolling oils and may be ozone-treated or flame-treated. Peel strength is configuration-dependent because film thickness, air gap, melt temperature, and substrate gauge alter the result more than the resin alone, so no single peel value should be treated as a specification limit. Low-temperature flexibility results from the reduction in crystallinity to approximately 25–35% by heat of fusion, compared with 45–55% for branched low-density polyethylene. This reduces stiffening at sub-ambient temperatures, but V315 remains less flexible than EVA grades containing 25–33 wt% vinyl acetate. The thermal cliff is most visible at the Vicat softening point: the value falls from approximately 93–100 °C for LDPE to 63–70 °C for V315, which excludes the material from hot-fill and retort packages unless it is protected by a higher-temperature structural layer.
Extrusion lamination lines using a 90 mm single-screw extruder with a 24:1–30:1 L/D barrier screw and a coat-hanger die typically process V315 at melt temperatures of 210–230 °C. Cylinder zones are set between 150 °C and 220 °C; the feed throat is kept below 40 °C to prevent pellet bridging. Screen packs of 60/80/120 mesh generate back pressure and improve melt homogeneity. The material should not be held above 250 °C for more than a few minutes because thermal deacetylation releases acetic acid, which attacks unplated die lips and produces an acrid odour. A die-lip gap of 0.7–1.0 mm and an air gap of 80–150 mm provide a balance between bond strength and neck-in. For aluminium foil lamination, the foil web is often preheated to 50–70 °C immediately before the nip to reduce thermal shock and improve adhesion.
The two most important incoming quality-control values for processing are the melt mass-flow rate and Vicat softening point. Melt mass-flow rate at 2.16 kg is a low-shear measurement of molecular weight, but extrusion coating draw stability correlates more strongly with melt strength and high-shear viscosity. A grade with 3.0 g/10 min melt flow has lower draw resonance resistance than a fractional-melt flow LDPE, especially when the air gap is long. The following table provides typical ranges for a V315-class 15 wt% vinyl acetate EVA copolymer. These are not specification limits and should be confirmed against the certificate of analysis for each lot.
| Property | Test method | Typical range |
|---|---|---|
| Vinyl acetate content | FTIR or saponification | 14–16 wt% |
| Melt mass-flow rate (190 °C, 2.16 kg) | ISO 1133-1:2022 | 2.7–3.3 g/10 min |
| Density | ISO 1183-1 | 0.930–0.940 g/cm³ |
| Vicat softening point (A50) | ISO 306 | 63–70 °C |
| Tensile strength at break | ISO 527-2 | 12–16 MPa |
| Elongation at break | ISO 527-2 | 700–800% |
Tensile properties are reported from ISO 527-2 with Type 5A or Type 1B specimens; parallel ASTM D638-14 data may differ because of specimen geometry and strain rate. The melt mass-flow rate is expressed in g/10 min and is an inverse measure of melt viscosity at low shear; it does not predict high-shear extrusion pressure or die swell.
In tubular blown film, V315 is processed at a blow-up ratio of 2.0:1–2.8:1 and a die gap of 0.8–1.5 mm. Melt temperatures are kept at 160–190 °C to preserve bubble stability; above 190 °C the lower melt tension can induce bubble wander and variability in thickness. Frost line height is adjusted to 3–6 die diameters to balance quench and film optics. The heat-seal initiation temperature is typically 95–110 °C under ASTM F88, lower than low-density polyethylene and therefore useful for sealant layers in coextruded films. Hot tack performance is dependent on seal bar temperature, dwell time, and gauge; processors should map seal windows on the actual line because laboratory data under ASTM F1921 may not transfer directly to packaging machines.
For injection molding of flexible closures and technical parts, barrel temperatures from 160 °C to 200 °C and a nozzle setting not exceeding 200 °C are typical. Mold temperatures are held at 20–40 °C, and back pressure is limited to 3–6 MPa to reduce shear heating. Clamp force requirements usually fall between 1.0 t/cm² and 1.5 t/cm² of projected area for thin-wall parts. Because V315 is a low-vinyl-acetate grade, purging from a polyolefin screw can be performed with standard low-density polyethylene or fractional-MFI LDPE. Purging should continue until no acetic acid odour is detected at the die exit. Hot-runner channels should be streamlined and free of dead spots; dwell times longer than 120 s at temperatures above 220 °C promote yellowing and localised deacetylation.
Neck-in increases with line speed because the molten curtain spends less time in the air gap and the viscoelastic melt tension is progressively exceeded. For a low-viscosity V315 melt, a change in line speed from 40 m/min to 80 m/min can raise neck-in by 10–20 mm on a standard die, although the exact value depends on die width, die-lip gap, melt temperature, and coating thickness. To reduce draw resonance, the die-lip gap can be increased to 0.8–1.0 mm, the air gap shortened to 100 mm or less, or a coextruded LDPE skin layer can be added to raise melt curtain strength. Melt temperature should remain at 210–230 °C; reducing it to 190 °C may increase melt tension, but it also raises the risk of gauge bands and reduces foil wetting.
High-shear twin-screw compounding with modular 40:1 L/D corotating screws requires tight thermal control. EVA decomposition above 230 °C follows pseudo-first-order chain scission; the acetate side group releases acetic acid. The acid can attack calcium carbonate fillers, generating carbon dioxide and microvoids, and can corrode iron-based barrel liners and die plates. Barrel zones in compounding are therefore set from 140 °C to 180 °C, with die temperature at 180 °C and specific energy input below 0.25 kWh/kg. Residence time is kept under 120 s. Screws should use neutral kneading blocks rather than aggressive reverse elements. The resin is pre-dried at 55–60 °C for 2–4 h when stored at relative humidity above 70%; although V315 absorbs less moisture than higher-VA EVA grades, surface condensation can generate splay in thin films.
Regulatory status for V315 is application-specific. For food-contact use, the base ethylene-vinyl acetate copolymer may fall under FDA 21 CFR 177.1350, which covers ethylene-vinyl acetate copolymers with specified extractable limits and use conditions. In the European Union, plastic food-contact articles must comply with Regulation (EU) No 10/2011; vinyl acetate monomer has a specific migration limit of 12 mg/kg food simulant. REACH registration and RoHS heavy-metal restrictions should be verified against the supplier's current certificate. The following matrix lists the principal standards used in incoming quality control and compliance review.
| Standard/Regulation | Relevant scope |
|---|---|
| FDA 21 CFR 177.1350 | Ethylene-vinyl acetate copolymers for food-contact articles |
| EU (EU) No 10/2011 | Plastic food-contact migration; vinyl acetate SML 12 mg/kg |
| REACH (EC) No 1907/2006 | Registration, evaluation, authorisation, and restriction of chemicals |
| RoHS 2011/65/EU | Heavy metal and brominated flame retardant restrictions |
| ISO 1133-1:2022 | Melt mass-flow rate for incoming QC |
| ASTM D1238 | Alternative melt flow rate testing used in North America |
Within the low-vinyl-acetate EVA product family, V315 is positioned between lower-flow grades and higher-flow grades. A lower-flow grade increases melt strength for tubular blown film and deep-draw thermoforming; a higher-flow grade fills thin-wall injection molds more readily but may increase gate blush and sink marks. The chemical resistance and service temperature are governed primarily by the 15 wt% vinyl acetate content, not by melt flow. Continuous load-bearing service above 60 °C is not recommended. The product is also unsuitable for direct contact with strong oxidising acids and with some amine-based processing aids because residual acidic species may promote salt formation and plate-out. These boundaries should be confirmed by end-use testing.
