| HS Code | 240094 |
| Product Name | ELVAX 3135SB Ethylene Vinyl Acetate Copolymer |
| Resin Type | Ethylene Vinyl Acetate (EVA) Copolymer |
| Vinyl Acetate Content | 12% |
| Melt Flow Rate | 0.35 g/10 min |
| Density | 0.935 g/cm³ |
| Melting Point | 98 °C |
| Vicat Softening Temperature | 70 °C |
| Tensile Strength At Break | 24 MPa |
| Elongation At Break | 600% |
| Hardness | 45 Shore D |
| Brittleness Temperature | -70 °C |
| Flexural Modulus | 75 MPa |
As an accredited ELVAX 3135SB Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX 3135SB Ethylene Vinyl Acetate Copolymer is supplied as free-flowing pellets in 25 kg multi-layer paper bags. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with ELVAX 3135SB Ethylene Vinyl Acetate Copolymer in secure, palletized packaging for safe transport. |
| Shipping | ELVAX 3135SB is shipped as solid pellets in multi-wall paper or polyethylene bags, palletized and stretch-wrapped. Keep dry, avoid direct sunlight and temperatures above 50°C to prevent agglomeration. Use protective gloves and dust masks during handling. Transport as non-hazardous per DOT unless melt-spill conditions apply. |
| Storage | Store ELVAX 3135SB in a cool, dry area away from direct sunlight, heat sources, and oxidizing materials. Keep the original container tightly sealed to prevent moisture pickup, which can affect processing. Avoid outdoor storage and excessive humidity. With proper conditions, the copolymer remains stable for an extended shelf life. |
| Shelf Life | Shelf life is typically two years from shipment date when stored in original, unopened packaging under cool, dry conditions. |
ELVAX 3135SB is an ethylene vinyl acetate copolymer supplied in pellet form with a nominal vinyl acetate comonomer content of 12% by weight, a melt flow rate of approximately 0.35 g/10 min under ISO 1133-1:2022, and a density near 0.933 g/cm³ under ISO 1183-1:2019. The low melt flow rate imposes specific mixing and pumping requirements in downstream equipment, while the 12% vinyl acetate content provides a balance of polarity, heat-seal response, and compatibility with polyolefins that differs from high-vinyl-acetate EVA grades. The following application scenarios are limited to downstream processes where such a low-MFI, low-VA grade is documented in industrial practice; published data for configurations outside these boundaries is limited.
| Standard or regulation | Application boundary | Relevant parameter |
|---|---|---|
| FDA 21 CFR 177.1350 | Food-contact sealant webs | Ethylene-vinyl acetate copolymers, extractives limits |
| Regulation (EU) No 10/2011 | Food-contact sealant webs | Overall migration limit 10 mg/dm² |
| EN 13707:2004+A2:2018 | Modified bitumen waterproofing membranes | Flexible sheets product standard |
| ASTM D5147-18 | Modified bitumen sheet testing | Sampling and testing methods |
| Regulation (EC) No 1935/2004 | Masterbatch carrier in food-contact materials | General food-contact material compliance |
| Directive 2011/65/EU | Masterbatch and industrial profiles | RoHS restricted substances |
| ISO 527-2 | Semi-flexible extruded profiles | Tensile properties |
| ISO 178 | Semi-flexible extruded profiles | Flexural properties |
| ASTM D1693-15 | Polyolefin modification | Environmental stress crack resistance |
| ISO 1798 | Crosslinked foam | Tensile strength and elongation |
| ISO 844 | Crosslinked foam | Compression set |
| FMVSS 302 | Crosslinked foam in automotive interiors | Flammability |
| ASTM D938-21 | Wax compound modification | Congealing point |
| ASTM D1321-19 | Wax compound modification | Needle penetration of petroleum waxes |
In three-layer coextruded food-contact films, ELVAX 3135SB is processed as the sealant skin layer because the 12% vinyl acetate comonomer content disrupts polyethylene crystallinity sufficiently to reduce seal initiation temperature while retaining sufficient melt strength for bubble stability at a melt flow rate of 0.35 g/10 min. The formulation addition ratio in the sealant layer is typically 60–80 wt% ELVAX 3135SB with 20–40 wt% linear low-density polyethylene having a melt index of 1.0–2.0 g/10 min; the LLDPE fraction is adjusted upward when hot-tack strength must be maintained above 120°C. Downstream production is performed on three-layer blown-film lines with die gap 1.8–2.4 mm, melt temperature 190–215°C, and blow-up ratios between 2.0:1 and 2.8:1. Because ethylene vinyl acetate liberates acetic acid at elevated temperatures, residence time above 240°C is limited to less than 10 minutes, and chromium-plated die lips are preferred to reduce corrosion. Food-contact compliance is governed by FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers and Commission Regulation (EU) No 10/2011, with overall migration testing at 10 mg/dm² and specific migration limits for vinyl acetate monomer. Terminal product types include frozen food lidding film, cheese overwrap, stand-up pouch inner sealant webs, and non-sterile medical device pouch sealant layers where the EVA is not the fluid-contact layer.
Low-shear paddle agitation is insufficient for dispersing ELVAX 3135SB into oxidized bitumen because the polymer domain size remains above 100 µm unless a high-shear rotor-stator mixer or an inline colloid mill is used at temperatures above 160°C. In modified bitumen waterproofing compounds, ELVAX 3135SB is metered at 3–6 wt% of the total compound, with the balance being oxidized bitumen, calcium carbonate filler, and in some formulations 2–5 wt% atactic polypropylene. The production process uses a high-shear mixing vessel at 175–185°C under nitrogen blanket for 60–90 minutes, followed by feeding to a carrier saturation line where polyester or glass-fiber mat is saturated at 35–55 m/min and cooled below 35°C before winding. Low-temperature flexibility and high-temperature flow resistance are measured under ASTM D5147-18, while the finished membrane is evaluated under EN 13707:2004+A2:2018 for flexible sheets for waterproofing; dimensional stability is tested under EN 1107-2. Terminal product types include torch-applied polymer-modified bitumen membranes, bridge-deck waterproofing underlays, and self-adhesive roofing repair tapes.
On high-torque twin-screw compounding lines with L/D ratios of 40:1 to 52:1, ELVAX 3135SB functions as a carrier resin for white masterbatches and processing-aid concentrates because its low melt flow rate contributes to high melt-mixing viscosity and lower migration of liquid additives in pelletized concentrates. The carrier addition level in masterbatch formulations commonly falls between 20 wt% and 50 wt%, with titanium dioxide loadings of 50–70 wt% in white concentrates and the remainder functional additives such as erucamide or zinc stearate; specific screw profiles using two- and three-lobe kneading blocks are required to disperse TiO₂ without overworking the carrier. Pelletizing is conducted by strand water-bath cooling and rotary cutting; barrel temperatures are held at 160–190°C with a die plate temperature of 170–185°C. Compliance for masterbatches supplied into the EU packaging chain is assessed under Regulation (EC) No 1935/2004 for food contact materials, Regulation (EU) No 10/2011 for plastic food contact articles, and Directive 2011/65/EU for RoHS-restricted substances. Terminal product types include polyethylene stretch-film white masterbatch, anti-block concentrates, and polymer processing-aid masterbatch for polyolefin film extrusion.
Addition of ELVAX 3135SB to high-density polyethylene or linear low-density polyethylene at 10–30 wt% lowers flexural modulus and improves stress-crack resistance in extruded profiles used for edge protection, appliance sealing, and closure liners. The polymer blend is compounded on a corotating twin-screw extruder at barrel temperatures of 170–200°C, then pelletized and fed to a single-screw profile extrusion line with vacuum calibration and cutting. Operational boundaries include the lower thermal stability of EVA relative to polyethylene under prolonged heating: processing temperatures should not exceed 230°C for extended residence times, and peroxide-containing concentrates must be avoided unless the profile is intended for crosslinking. Compliance for non-food industrial profiles is verified against REACH and Directive 2011/65/EU, with mechanical testing under ISO 527-2 for tensile properties, ISO 178 for flexural properties, and ASTM D1693-15 for environmental stress crack resistance. Terminal products include machinery edge guards, agricultural sheet fastening profiles, and appliance gaskets.
When compression-molded crosslinked foam formulations incorporate ELVAX 3135SB, the low melt flow rate of 0.35 g/10 min acts as a viscosity buffer during gas expansion, reducing cell coalescence when the blowing agent decomposes. The formulation addition ratio is given in the table below; typical ranges are 40–60 wt% ELVAX 3135SB, 40–60 wt% LDPE, 2.5–4.0 phr azodicarbonamide, 0.6–1.0 phr dicumyl peroxide, and 0.5–1.0 phr zinc oxide. Mixing on a two-roll mill at 105–115°C is required to avoid premature decomposition of azodicarbonamide, which initiates near 195–205°C depending on particle size. Crosslinked foam boards are compression molded at 150–165°C under 10–15 MPa, followed by free expansion at 160–170°C. Physical properties are tested under ISO 1798 for tensile strength and elongation, ISO 844 for compression set, and flammability under FMVSS 302 where automotive interior trim is involved. Terminal product types include anti-fatigue mats, industrial padding, and expansion joint filler boards.
| Component | Range | Function |
|---|---|---|
| ELVAX 3135SB | 40–60 wt% | Base resin and gas retention |
| LDPE | 40–60 wt% | Viscosity and melt-strength modifier |
| Azodicarbonamide | 2.5–4.0 phr | Blowing agent |
| Dicumyl peroxide | 0.6–1.0 phr | Crosslinking initiator |
| Zinc oxide | 0.5–1.0 phr | Blowing agent activator |
When the resin is used as a wax-modifying additive for paraffinic coatings and candle compounds, ELVAX 3135SB is added at 1–5 wt% of the total wax compound to reduce mottling, increase blocking resistance, and raise congealing point. The production process consists of a stirred wax melt at 100–120°C with moderate agitation, followed by cooling under continuous agitation to 60–70°C and casting into slabs or pastilles. Quantitative published data for this specific grade in candle compounds is limited; industrial practice uses the lower addition range for coating waxes and the upper range for high-wax candle blends. Compliance is tested under ASTM D938-21 for congealing point and ASTM D1321-19 for needle penetration of petroleum waxes, with classification and labeling under Regulation (EC) No 1272/2008. Terminal product types include industrial wax coatings for corrugated board, candle compounds, and wax-based adhesives for paper bonding.
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ELVAX 3135SB is an ethylene-vinyl acetate copolymer resin supplied as a high-molecular-weight, low-melt-index pellet. The vinyl acetate comonomer content is 12 wt% and the melt index is 0.35 g/10 min when determined under ASTM D1238 at 190°C with a 2.16 kg load. Density at 23°C is 0.934 g/cm³ under ASTM D1505. Differential scanning calorimetry at 10 K/min produces a broad melting endotherm with a peak near 95°C. The 12 wt% vinyl acetate placement reduces polyethylene crystallinity, lowers melting point, and increases chain flexibility relative to unmodified high-pressure polyethylene. The grade is specified where high melt strength, low-temperature toughness, and controlled seal-layer behavior are needed in blown film, extrusion coating, hot-melt adhesive modification, and compounded concentrates. The SB suffix identifies a slip/antiblock-containing formulation variant, which reduces film-to-film blocking and modifies surface friction without converter-dry-blended additives.
The low melt index produces shear viscosity at 190°C and 100 s⁻¹ substantially above that of 2.0–3.0 g/10 min EVA grades. This raises back pressure in single-screw extrusion and shifts the bubble stability window in blown film. The resin is not classified as hygroscopic; however, surface moisture from condensation or high-humidity storage can induce surging and visual defects. When appearance defects or screw feed instability appear, pre-drying in a desiccant hopper dryer at 60°C for 4 h is applied. Regrind addition above 30 wt% is limited because the slip/antiblock package and molecular weight distribution can shift gel formation and bubble stability.
Melt index is an inverted flow metric rather than a direct viscosity measurement. A value of 0.35 g/10 min indicates high molecular weight and elevated melt elasticity under extensional deformation. On a 30:1 L/D smooth-bore or grooved-feed extruder with a barrier screw and Maddock mixing section, barrel zone temperatures are typically set from 150°C at the feed throat to 200°C in the metering section, with adapter and die temperatures from 190°C to 215°C. Melt pressure at the die head rises relative to LDPE because the low melt index increases shear viscosity. Screw speed must be adjusted to maintain melt temperature below 230°C; sustained residence time above this threshold accelerates deacetylation and acetic acid release.
In blown film, the high melt strength stabilizes the bubble at blow-up ratios of 2.0:1 to 3.0:1 and frost-line heights of 2 to 6 die diameters. Die gaps from 1.0 mm to 1.8 mm are used to balance film gauge distribution and tear propagation. In extrusion coating, chill-roll temperatures from 15°C to 25°C and an air gap of 100–200 mm are common; melt temperature at the die may be increased to 280–310°C when adhesion to paper or aluminum foil requires higher oxidation and surface wetting. Adhesion to corona-treated substrates is generally adequate when surface energy exceeds 38 mN/m as determined by contact-angle test inks conforming to ASTM D2578.
Hot-melt adhesive compounding with ELVAX 3135SB uses a formulation space of 25–40 wt% polymer, 30–50 wt% tackifier resin, and 10–30 wt% paraffin or Fischer-Tropsch wax. A sigma-blade mixer or planetary mixer heated to 150–170°C with rotor speed from 30 rpm to 60 rpm provides sufficient high-shear dispersion. The high melt viscosity of this 0.35 g/10 min EVA contributes to cohesive strength but raises mix torque and requires staged addition. Melt viscosity at 180°C is formulation-dependent and is measured by ASTM D3236. Thermal exposure above 230°C accelerates acetic acid formation; nitrogen blanketing or venting is recommended in continuous mixing lines. The 12 wt% vinyl acetate content limits solubility in highly polar tackifiers compared with 28 wt% vinyl acetate grades, which affects cloud point, open time, and migration kinetics in finished adhesive joints.
The following values are typical property data and are not specification release limits. Batch-to-batch variance for melt index is commonly controlled within ±0.05 g/10 min, while density batch variance is typically within ±0.002 g/cm³.
| Property | Typical Value | Method and Condition |
|---|---|---|
| Vinyl acetate content | 12 wt% | ASTM D5594 / FTIR calibration |
| Melt index | 0.35 g/10 min | ASTM D1238, 190°C, 2.16 kg |
| Density | 0.934 g/cm³ | ASTM D1505, 23°C |
| Tensile strength at break | 26 MPa | ASTM D638, 50 mm/min |
| Elongation at break | 760% | ASTM D638, 50 mm/min |
| Shore A hardness | 95 | ASTM D2240, 15 s |
| Vicat softening temperature | 79°C | ASTM D1525, 10 N |
| Melting peak | 95°C | DSC, 10 K/min |
Regulatory status is composition-dependent. The base ethylene-vinyl acetate copolymer may fall within the scope of 21 CFR 177.1350 for food-contact use when the additive package is validated for the finished article. Converter verification of overall migration and specific migration limits is required under EU 10/2011 before use in food-contact films.
| Regulatory Domain | Designation | Limitation and Scope |
|---|---|---|
| US food contact | 21 CFR 177.1350 | Ethylene-vinyl acetate copolymers; end-use limitations apply. |
| EU plastic food-contact | EU 10/2011 | Specific migration limits must be confirmed for the finished article. |
| RoHS | Directive 2011/65/EU | Restricted substances in electrical and electronic equipment components. |
| REACH SVHC | EC 1907/2006 | Candidate list screening applies to imported formulations. |
Blown film from ELVAX 3135SB is used in coextruded sealant layers where a 10–20 wt% layer contributes seal initiation and hot-tack. In a three-layer line with a polyolefin core and outer layer, the sealant layer is extruded at 190–215°C, with die gap from 1.2 mm to 2.0 mm and blow-up ratio from 2.0:1 to 2.5:1. Seal initiation temperature is measured by ASTM F1921 or seal-strength methods under ASTM F88. The 12 wt% vinyl acetate grade seals at a higher temperature than an 18 wt% vinyl acetate grade under equivalent film thickness and thermal history. The SB slip/antiblock system reduces blocking and can lower kinetic coefficient of friction to 0.2–0.4, depending on film aging and migration of surface additives.
The 12 wt% vinyl acetate placement in ELVAX 3135SB is lower than the 18–28 wt% range used for demanding sealants and tie layers. When high peel adhesion to polar substrates or low-temperature flex-crack resistance is required, an 18 wt% vinyl acetate grade with melt index near 2.5 g/10 min may be substituted. That substitution typically broadens the seal window and increases adhesion to aluminum foil but reduces Vicat softening temperature and increases blocking tendency. Compared with low-density polyethylene of similar melt index, ELVAX 3135SB reduces seal initiation temperature and improves stress-crack resistance while lowering tensile modulus; the reduction in crystallinity also improves flex-crack resistance in frozen packaging. The lower vinyl acetate level relative to 18–28 wt% EVA grades provides better dimensional stability, lower surface tack, and higher temperature resistance, but less compatibility with highly polar tackifiers and lower adhesion to aluminum without primer.
ELVAX 3135SB is also used as a carrier resin for color masterbatches and functional concentrates where high melt strength permits high filler loading. In a twin-screw extruder with 40:1 L/D and side stuffing, carbon black or mineral filler loadings of 40–60 wt% are processed at melt temperatures from 180°C to 210°C. Torque and specific mechanical energy input are higher relative to EVA grades with melt index above 2 g/10 min. Screw configuration with distributive mixing elements minimizes localized overheating. The low melt index increases residence time in the die, which stabilizes high-viscosity strands during underwater pelletizing. Strong acid or amine-based additives that catalyze deacetylation should be avoided; sustained melt temperature above 230°C produces acetic acid and can corrode downstream equipment.
