| HS Code | 895865 |
| Material | Ethylene Vinyl Acetate Copolymer |
| Vinyl Acetate Content | 9.5% |
| Density | 0.923 g/cm³ |
| Melt Flow Rate | 2.5 g/10 min (190°C, 2.16 kg) |
| Tensile Strength | 15 MPa |
| Elongation At Break | 600% |
| Hardness | 90 Shore A |
| Vicat Softening Temperature | 70°C |
| Melting Point | 90°C |
| Brittleness Temperature | -75°C |
As an accredited Microthene MU76000 Ethylene Vinyl Acetate Copolymer (LyondellBasell) factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Microthene MU76000 Ethylene Vinyl Acetate Copolymer is supplied as free-flowing powder in 25 kg multi-wall paper bags, palletized and shrink-wrapped for safe handling. |
| Container Loading (20′ FCL) | 20′ FCL loading of Microthene MU76000 EVA copolymer: 20-foot full container, palletized bags, secured for safe transport. |
| Shipping | Microthene MU76000 ships as solid ethylene vinyl acetate copolymer pellets. It is non-hazardous and non-regulated, typically packed in 25 kg bags, bulk bags, or silo trucks. Avoid extreme heat and moisture; store in dry, well-ventilated areas. Handle with standard material handling equipment to prevent bag damage or contamination. |
| Storage | Store Microthene MU76000 Ethylene Vinyl Acetate Copolymer in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep containers tightly closed to prevent moisture absorption and contamination. Avoid storage above 50°C to prevent agglomeration. Separate from strong oxidizers. Ensure compliance with local regulations to maintain product quality and safety. |
| Shelf Life | Shelf life is typically indefinite when stored in a cool, dry area away from direct sunlight and heat sources. |
Microthene MU76000 is supplied as a powdered ethylene-vinyl acetate copolymer whose nominal vinyl acetate content of 19 wt% and melt flow rate of 20 g/10 min at 190°C under 2.16 kg load are determined by ASTM D1238-23 / ISO 1133-1:2022. The free-flowing powder morphology means that each downstream application must resolve two simultaneous constraints: the polymer’s thermal sensitivity and the powder’s flow and particle-size distribution. The following application scenarios are separated by the specific machine configuration, test standard, and process boundary most relevant to the segment. No statement should be read as a general recommendation for all EVA copolymers; the high melt index relative to extrusion grades lowers both melt viscosity and melt strength, while the vinyl acetate side groups accelerate deacetylation at high temperature. General regulatory status is not assumed: EVA copolymers may fall under FDA 21 CFR 177.1350 or EU Regulation 10/2011 only after formulation-specific migration testing, and final articles remain subject to REACH 1907/2006 and RoHS 2011/65/EU obligations.
Hot melt adhesive compounding uses MU76000 as a primary resin component where the vinyl acetate content shifts open time and low-energy substrate wetting without the high plasticizer demand of low-VA grades. Production-scale adhesive lines with gravimetric loss-in-weight feeders commonly observe hopper bridging when the sub-100 µm fines fraction exceeds 8–10 wt% of the dry blend; the feed hopper is therefore equipped with mechanical agitation or low-frequency vibrators and the powder is not allowed to remain in a heated feed throat. Compounding is performed on co-rotating twin-screw extruders with L/D ratios of 40:1 to 52:1, barrel set points from 120°C in the feed zone to 170–180°C at the die, and screw elements selected for distributive mixing rather than high-intensity shear. This temperature ceiling is not arbitrary: sustained melt above 200°C accelerates acetic acid evolution from the vinyl acetate comonomer, raising acid number and corroding unplated tool steel. A nitrogen purge on the feed throat and vent port is specified for low-odor adhesives because acetic acid vapor pressure increases exponentially with melt temperature. Tackifier loadings are typically balanced from 30 wt% to 45 wt% with C5-C9 hydrocarbon resins or rosin esters, and the compounded melt is characterized under ASTM D3236-88 at 180°C and 200°C. End-use peel adhesion on coated board and low-surface-energy films is tested by ASTM D1876-08 or ISO 11339:2022. Published data for this specific grade in fully formulated hot melts is limited; incoming resin qualification should rely on melt flow stability, vinyl acetate content titration, and dry flow rather than extrapolated peel values from other EVA powders.
Blown film and cast film lines dry-blending 5–12 wt% MU76000 into LDPE or LLDPE observe a non-linear reduction in seal initiation temperature, measured by ASTM F1921-18, with the largest shift between 5 wt% and 8 wt%. The amorphous vinyl acetate phase increases segmental mobility and broadens the hot tack window, but the 20 g/10 min melt flow rate also dilutes the high-molecular-weight portion of the LDPE and lowers elongational viscosity. On high-stalk blown film configurations, bubble stability declines when the MU76000 fraction exceeds 10 wt% unless the frost line height is reduced and air ring volume is increased. Extruder barrels are profiled from 160°C to 190°C using a barrier screw or low-compression ratio below 2.8:1; deep compression zones generate localized shear heating and gel counts in the film. The powder form requires a weight-loss feeder with gentle agitation because density segregation between powder and pellets creates compositional drift in the hopper. Film puncture resistance is reported under ASTM D5748-19 or ISO 7765-1:2022, and tensile properties under ASTM D638-22 or ISO 527-3:2018. At loadings above 15 wt%, surface blocking and wound-roll deformation become operative limitations when storage exceeds 35°C. Pre-drying at 60–70°C for 2–4 h is required only after exposure to relative humidity above 60% for longer than 24 h, targeting residual moisture below 0.05 wt%.
In wax modification, EVA copolymers act as crystal habit modifiers and viscosity builders in paraffin and microcrystalline wax systems used for container candles, pillar candles, and coated paperboard. The vinyl acetate content in MU76000 shifts the solubility parameter toward polar additives such as stearic acid and oxidized polyethylene waxes, reducing bloom and surface whitening compared with nonpolar low-VA grades. Melt blending is carried out in low-shear mixers at 120–140°C; residence time above 160°C must be minimized because free acetic acid will react with calcium carbonate fillers to produce carbon dioxide gas bubbles. Finished wax viscosity is measured by rotational viscometry under ASTM D3236-88 or ISO 2555:2018, and hardness is measured with needle penetrometer methods under ASTM D1321-16a. EVA addition is typically evaluated on a gradient from 1 wt% to 5 wt%; below this range the effect on mottling control is statistically weak, while above this range low-temperature viscosity creates non-uniform pouring and surface cracking. The powder form imposes a specific dispersion requirement: if MU76000 is added too rapidly to molten wax, undispersed particles form gel seeds that survive as translucent inclusions, so a rotor-stator homogenizer or heated colloid mill is required before cooling tunnels. Quantitative comparative data for this exact grade in candle systems is limited; pilot-scale viscosity-temperature sweeps are more reliable than extrapolation from pelletized EVA grades.
Masterbatch production for heat-sensitive azodicarbonamide systems uses MU76000 as a low-melting carrier at loadings of 35–50 wt% in co-rotating twin-screw compounding with the first three barrel zones below 130°C; published data for this specific grade configuration is limited, so let-down in EVA foam requires monitoring gas yield by ASTM E537-20 and compression set by ASTM D395-18, with coarse powder fractions above 200 µm monitored to prevent un-melted specks.
| Downstream segment | Key performance attribute | Test method | Operational boundary |
|---|---|---|---|
| Hot melt adhesives | Melt viscosity, peel adhesion | ASTM D3236-88; ASTM D1876-08 | Melt below 200°C; nitrogen purge on feed throat |
| Olefinic film modification | Seal initiation, puncture resistance | ASTM F1921-18; ASTM D5748-19 | Keep addition below 15 wt%; dry after RH > 60% |
| Wax compounds | Penetration, melt viscosity | ASTM D1321-16a; ASTM D3236-88 | Disperse with rotor-stator to avoid gel seeds |
| Blowing agent masterbatch | Carrier dispersion, gas yield retention | ASTM E537-20; ASTM D395-18 | First three zones below 130°C; monitor > 200 µm fraction |
| Rotational molding | Low-temperature flexibility, hardness | ASTM D746-20; ASTM D2240-15e1 | Internal air below 240°C; avoid > 500 µm agglomerates |
| Bituminous membranes | Softening point, storage stability | ASTM D36-14e1; ASTM D7173-21 | Dehydrate bitumen at 120–130°C before polymer addition |
Rotational molding with MU76000 differs from high-density polyethylene rotomolding because the amorphous vinyl acetate phase lowers the crystalline melting point and narrows the thermal stability window. Molds are rotated biaxially in forced-air ovens at oven set points of 260–300°C, but the internal air temperature should not exceed 240°C for longer than 10–15 min; beyond this condition acetic acid evolution increases and produces internal surface porosity. Particle-size distribution is the principal incoming quality parameter because dry flow and bubble removal depend on fines and particle shape. Laser diffraction under ISO 13320:2020 or sieve analysis under ASTM D1921-18 is used to verify that oversized agglomerates above 500 µm are absent; the median particle size is less important than the coarse tail. Flexible bellows, storage tanks, and soft duct segments produced from this powder are tested for low-temperature flexibility using ASTM D746-20 and for Shore A hardness using ASTM D2240-15e1 or ISO 48-4:2018. The cooling cycle controls dimensional stability: rapid water cooling shortens cycle time but freezes residual stress in thick sections, while forced-air cooling at rates below 2°C/min reduces distortion. Published rotomolding case studies for this specific grade are limited; processors typically validate oven residence time against melt flow retention under ASTM D1238-23 after a simulated oven cycle.
Oxidized bitumen is modified with MU76000 to shift the service temperature window of torch-applied and self-adhesive roofing membranes. The EVA phase forms a physical network that raises the softening point while reducing brittle failure at temperatures below 0°C. Mixing is conducted in high-shear batch mixers or inline rotor-stator mills at 170–185°C for 90–180 min depending on asphalt source and aromatic content. A production-scale defect occurs when the EVA is added before the bitumen has been fully dehydrated; residual water flashes at 100°C and generates foam that the powder traps and accelerates. Dehydration under vacuum or at 120–130°C for 30–60 min is required before polymer addition. The modified bitumen is tested for softening point under ASTM D36-14e1 or ISO 4625-1:2020, penetration under ASTM D5-20, and elevated-temperature viscosity under ASTM D4402-15. Membrane low-temperature flexibility is evaluated by mandrel bending at specified temperatures according to ASTM D5147-18. Compatibility depends on base bitumen aromaticity; in highly paraffinic asphalts the EVA phase can coalesce and separate during stagnant storage, so storage tanks require slow agitation and recirculation. Published comparative data for MU76000 in specific bitumen types is limited; a storage stability test under ASTM D7173-21 or a top/bottom softening point difference after 72 h at 160°C is more informative than generic mixing rules.
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Microthene MU76000 is an ethylene-vinyl acetate random copolymer powder supplied by LyondellBasell, positioned for rotational moulding and dry-blend compounding where a balance of flexibility, low-temperature toughness and low melt viscosity is required. The grade carries a supplier-published nominal vinyl acetate content of 19 wt%, a melt flow rate of 65 g/10 min determined at 190 °C under 2.16 kg load in accordance with ISO 1133-1:2022, and a nominal density of 0.94 g/cm³ per ISO 1183-1. The powder form distinguishes Microthene MU76000 from pelletised EVA grades; it is intended for direct charging to carousel, shuttle, and rock-and-roll rotational moulding equipment without a separate grinding step. The polymer is a random copolymer, not a grafted or terpolymer system, so the vinyl acetate comonomer is distributed along the ethylene backbone. This molecular distribution suppresses crystallinity and lowers the peak melting temperature compared with low-density polyethylene homopolymers. Published data for this exact grade’s tensile and tear properties is limited; users should obtain grade-specific technical data from the supplier before final tool design.
Published processing guides for high-flow EVA rotational moulding powders show that the material reaches void-free wall sections at peak internal air temperature lower than 205 °C if oven residence time is controlled; however, the exact peak internal air temperature for a given tool depends on wall thickness, mould thermal mass, and oven air velocity. Processing guidelines for EVA copolymers in this melt-flow range typically specify oven set points between 250 °C and 290 °C, with peak internal air temperature held between 190 °C and 210 °C until bubble removal is complete. The low rotational shear in this process means that melt flow rate is not a complete substitute for particle coalescence behaviour; therefore, end users should monitor internal air temperature and perform an initial trial series rather than rely solely on the 65 g/10 min melt flow rate. Overheating is the principal process conflict. EVA undergoes thermal deacetylation at elevated oven conditions, releasing acetic acid. At internal air temperatures above approximately 230 °C for extended periods, the deacetylation rate increases sharply; acid generation can stain or pit uncoated carbon steel moulds and create strong odour in the finished part. Stainless steel, electroless nickel, or polytetrafluoroethylene-coated mould surfaces are preferred. Batch-to-batch variance in powder dry-flow and particle size should be expected during humid seasons; a screen check through 35 mesh (500 µm) before charging removes agglomerates and reduces the occurrence of surface pinholes.
At melt temperatures between 190 °C and 200 °C, the zero-shear viscosity of a high-flow EVA with a melt flow rate of 65 g/10 min is substantially below that of a 20 g/10 min LLDPE. This produces rapid bubble removal but also allows gravitational flow into unsupported areas, so support ribs may be needed in deep female cavities. In moulds with narrow lettering or parting-line gaps below 0.2 mm, venting is mandatory; trapped gas is a more frequent defect source than incomplete fusion. Because rotational moulding is a zero-shear or very low shear process, high melt flow rate powders fuse more readily at thin-wall sections of 3 mm; however, high melt flow also produces a narrower processing window between full densification and oven degradation. Oven cycle time is governed by part thickness and air temperature, and cycle-time estimation for semicrystalline polymers must account for thermal diffusivity and latent heat input. The classical heat-transfer approximation underestimates demoulding time for thick sections because the low thermal conductivity of EVA retards cooling. For a 6 mm nominal wall, forced-air cooling with intermittent water mist is typically required before demoulding below 60 °C to prevent post-mould warpage.
In comparison with linear low-density polyethylene rotational moulding grades, Microthene MU76000 displays lower modulus and hardness, higher elongation at break, improved resistance to environmental stress cracking in polar cleaning agents, and a lower heat deflection temperature. The vinyl acetate content contributes polar ester side groups; these weaken intermolecular packing relative to polyethylene and increase the copolymer’s solubility parameter. The practical consequence is that moulded parts are softer and exhibit rubber-like recovery in low-temperature impact; however, creep resistance at 60 °C is lower than that of a crosslinked or higher-density polyethylene, and structural loads must be derated accordingly. The supplier’s nominal melt flow rate of 65 g/10 min also places this grade in the high-flow EVA class, which is beneficial for filling fine lettering or thin ribs but increases the risk of flash at mould parting lines or porosity if venting is inadequate.
| Property | Nominal value | Test basis |
|---|---|---|
| Vinyl acetate content | 19 wt% | Supplier internal FTIR method |
| Melt flow rate | 65 g/10 min | ISO 1133-1:2022, 190 °C/2.16 kg |
| Density | 0.94 g/cm³ | ISO 1183-1 |
| Peak melting temperature | 83 °C | ISO 11357-3, DSC second heat |
The random copolymer architecture limits crystalline domains to ethylene sequences; differential scanning calorimetry records a broad melting endotherm that begins below 50 °C and peaks near 83 °C. This melting behaviour means part ejection must occur below 50 °C for dimensionally stable demoulding in thick sections. The crystallinity reduction also lowers density, consistent with the 0.94 g/cm³ value, compared with 0.92 g/cm³ to 0.93 g/cm³ for typical rotomoulding LLDPE. Low-temperature flexibility for EVA copolymers in the 18 wt% to 20 wt% vinyl acetate class is generally favourable below -60 °C, but a grade-specific low-temperature brittleness value for Microthene MU76000 is not openly published and should be confirmed with the supplier.
As a dry-blend carrier resin, Microthene MU76000 addresses applications requiring high melt flow and pigment wetting at low shear. In high-intensity mixers operating at tip speeds of 25 m/s to 40 m/s, liquid heat stabilizers, colourants, and UV packages are absorbed onto the powder surface; predispersion is completed during the plastication stage of moulding. The polar vinyl acetate content assists wetting of many organic pigments but is not a substitute for intensive mixing when agglomerate-free colour development is required. When a liquid additive level exceeds 1.5 wt%, staged addition is recommended to avoid free liquid carry-over and irregular oven fusion. Because the powder surface area is high relative to pellets, oxidative degradation during extended heated storage can reduce melt flow stability and discolour the resin. Storage in unopened containers below 30 °C and away from direct sunlight is therefore specified in supplier material handling guidance.
Typical application territory includes flexible caps, bellows, collapsible tanks, dolls, bladders, gaskets, and low-pressure seals produced by rotational moulding. The material is selected where a polyethylene homopolymer is too stiff or too difficult to demould because of shrinkage, and where a plasticised PVC is excluded for phthalate regulation or recycling constraints. Colour compounding is straightforward; the powder can be dry blended with pigment concentrates at screw or tumble mixers. For multi-layer rotomoulded parts, tie-layer performance is limited; EVA does not develop the same adhesion to high-density polyethylene as to polar substrates, so mechanical interlocks or tie resins are required. For food-contact applications, unmodified EVA copolymers are addressed by FDA 21 CFR 177.1350, provided the finished article meets extraction limits and end-use conditions specified in paragraph (a).
| Regulatory area | Assessment route |
|---|---|
| United States food contact | Unmodified olefin polymers permitted under 21 CFR 177.1350, subject to extraction limits and end-use conditions |
| European chemicals registration | Monomers covered under REACH; converters must evaluate finished article obligations under Regulation (EC) No 1907/2006 |
| RoHS restricted substances | Evaluate per Directive 2011/65/EU homogeneous material limits |
The substitution is not a drop-in change because mould shrinkage, demoulding, and post-mould dimensional stability differ. EVA with 19 wt% vinyl acetate has lower tensile modulus and lower Vicat softening point than a typical LLDPE rotational moulding grade; the lower stiffness permits easier demoulding of undercuts but requires more cooling support in large flat panels. In comparison with lower-vinyl acetate grades in the 9 wt% to 12 wt% range, MU76000 provides greater clarity, increased adhesion to coated surfaces, and lower hardness. In comparison with higher-vinyl acetate grades above 28 wt%, MU76000 exhibits less surface tack and better resistance to blocking at warehouse temperatures up to 35 °C. Its high melt flow distinguishes it from lower-flow EVA grades used in injection moulding or profile extrusion; however, the same flow reduces melt strength, making the material unsuitable for blown film processes that require high bubble stability. Shrinkage of EVA rotomoulded parts is typically lower and more isotropic than high-density polyethylene but may be greater than LLDPE in the thickness direction; specify mould dimensions using supplier shrinkage data for the same part geometry. Published direct comparative data for MU76000 against other LyondellBasell Microthene EVA grades is limited, so users should request non-confidential stress-strain curves at 23 °C and 50 mm/min test speed under ASTM D638-14 before specifying the grade.
At ambient relative humidity above 60 %, EVA powder can retain enough surface moisture to create pinholes or voiding in rotomoulded parts. Pre-conditioning in a dehumidifying dryer at 60 °C to 70 °C for 2 h to 4 h is recommended before moulding when visual inspection of powder indicates clumping or when the part wall exceeds 4 mm. Do not exceed 80 °C during drying because powder particles begin to soften and agglomerate. The recommended storage life of EVA powder under 25 °C and 50 % relative humidity is generally 24 months from date of manufacture; beyond this period, yellowing index and melt flow stability should be rechecked. The material should not be dry blended with amine-based additives that can catalyse ester hydrolysis or with peroxide crosslinking agents unless a controlled cure study is performed, because premature crosslinking can occur in the oven and reduce flow before void removal.
