LyondellBasell Icorene 3560 BUE 5104 is a linear low-density polyethylene (LLDPE) rotational moulding powder supplied for general-purpose rotomoulded articles. The base polymer is identified by the ISO 1043-1 designation PE-LLD and by CAS Registry Number 9002-88-4. The full grade designation separates the resin property set from producer-controlled suffix codes: 3560 identifies the base resin within the Icorene rotational moulding portfolio, while BUE and 5104 are additive, colour, and packaging codes that should be decoded through the current LyondellBasell technical datasheet or certificate of analysis rather than inferred from other polyolefin brands. Because rotational moulding operates under low shear, the powder form, particle size distribution, dry flow, and thermal stabilizer package are as significant to processing as the melt-flow value. This grade occupies the upper density region of the PE-LLD classification band and is therefore specified where a balance of stiffness, impact resistance, and environmental stress-cracking resistance is required without moving into high-density polyethylene.

Material Identity, Suffix Decoding, and Specification Limits

The grade is characterized through the standard polyethylene property set: melt mass-flow rate, density, tensile properties, flexural modulus, softening temperature, brittleness temperature, and environmental stress-cracking resistance. The published values are representative data generated under controlled laboratory conditions and do not constitute a batch specification. Lot-specific compliance is established by the release documentation supplied with each production batch. The following representative profile is consolidated from producer literature for the Icorene 3560 BUE 5104 grade.

A melt mass-flow rate of 5.0 g/10 min under 2.16 kg at 190 °C places this powder in the moderate-flow region for LLDPE rotational moulding. Higher-flow grades can reproduce finer surface detail but may show reduced ESCR. Lower-flow grades often build higher impact toughness but require longer oven residence time and can develop microporosity when peak internal air temperature is insufficient. Density near 0.935 g/cm³ provides higher stiffness than a lower-density LLDPE while retaining greater strain-at-break than a conventional high-density rotational moulding grade. The flexural modulus of 300 MPa indicates moderate load-bearing capacity in unfilled sections; for structural frames or deeply ribbed parts, the design should be verified through finite-element analysis combined with physical flexural testing under ISO 178.

What Processing Envelope Applies to This Rotational-Moulding Powder?

Rotational moulding of Icorene 3560 BUE 5104 requires control of powder particle size, dry flow, oven air temperature, peak internal air temperature, cooling rate, and mould release. Sieve analysis under ASTM D1921 or ISO 9276-2 characterizes the fractions retained on 63 µm, 125 µm, 250 µm, and 500 µm meshes. Excessive fines can promote electrostatic adhesion, uneven wall thickness, and bridging in narrow ribs. Overly coarse powder can inhibit sintering and increase surface porosity at the mould wall. Dry flow measured under ASTM D1895 Method A is used to verify consistent cavity filling on production machines. The powder should be stored in sealed containers below 30 °C and protected from condensation; moisture on the powder or mould surface can generate pinholes, surface voids, and reduced impact strength.

On clamshell, shuttle, or carousel machines with biaxial rotation, the charged mould is heated by forced convection. Oven air temperatures for many LLDPE rotomoulding powders are commonly set between 260 °C and 320 °C, but the required target temperature depends on wall thickness, mould material, oven air velocity, and part mass. The peak internal air temperature is the primary thermal endpoint. For this grade the processor should establish the recommended peak internal air temperature from the supplier’s processing guide and confirm it by thermocouple trials; many LLDPE rotational moulding processes operate in the 190 °C to 220 °C range. Undercooking below the required peak internal air temperature can leave inner-surface microporosity and low interfacial fusion. Overcooking can consume the antioxidant package, increase odour, cause yellowing, and embrittle corners. Cooling rate influences residual stress and part dimensions. Slow cooling reduces warpage but increases cycle time. Forced-air or water-mist cooling shortens the cycle but can create distortion when applied non-uniformly to parts with deep cavities or abrupt wall-thickness changes.

Mould release agents containing silicones can reduce demoulding force, but they may interfere with post-mould painting, bonding, or welding. If a coated or adhesive-bonded finish is required, the release agent should be checked against adhesion testing under ISO 4624 or ASTM D3359. For multi-part assemblies, hot-plate welding parameters must account for the fast solidification and moderate viscosity of this LLDPE grade. Hot-plate temperatures from 220 °C to 240 °C with controlled bead pressure are typical starting points for PE-LLD, but joint performance must be validated by burst testing or structural testing of the finished assembly. Published data for this specific configuration is limited in the open literature for weld factors, so joint design should not be extrapolated from resin tensile data alone.

Butene-Comonomer LLDPE Rotomoulding Grades Occupy a Distinct Position Relative to Hexene and Metallocene Products

LyondellBasell Icorene 3560 BUE 5104 is classified in producer literature as a butene-comonomer LLDPE rotational moulding powder. The butene branch length is shorter than that introduced by hexene or octene comonomers, and this difference affects the tie-molecule population, slow-crack-growth resistance, and impact-stiffness balance. Compared with a hexene-comonomer LLDPE of similar density and melt-flow rate, a butene grade typically exhibits lower tensile modulus, lower puncture energy, and greater sensitivity to warpage at equivalent wall thickness. The difference does not automatically make butene inferior: simple geometries with generous radii and uniform wall sections can tolerate the butene balance, while deeply contoured parts, severe service loads, or high ESCR requirements may require a hexene or octene grade. Selection should be based on the part design and the applicable end-use test, such as ESCR under ASTM D1693, instrumented dart impact under ISO 6603-2, or tensile testing under ISO 527-2.

Compared with high-density polyethylene rotational moulding powders of density 0.945 g/cm³ to 0.955 g/cm³, this grade provides lower flexural modulus and higher elongation at break. It is therefore used when the part must tolerate deformation without brittle fracture, but it is not the first choice when high creep resistance or maximum wall stiffness is required. Compared with metallocene-catalysed LLDPE rotomoulding grades, this grade may show a broader molecular weight distribution and a different response to cooling rate; metallocene grades frequently provide enhanced impact toughness and optical appearance at the same density, but they can also exhibit higher melt viscosity at a given melt index and may require different processing conditions. The stabilizer package represented by the BUE suffix further differentiates this grade from unstabilized or non-UV-stabilized powders. For outdoor parts, the stabilizer package influences long-term colour retention and surface embrittlement, but accelerated weathering under ISO 4892-2 is comparative rather than a direct service-life guarantee.

When Icorene 3560 BUE 5104 Is Specified for Outdoor Storage Tanks and Agricultural Service

Outdoor storage tanks, agricultural sprayer tanks, water tanks, equipment housings, and general-purpose containers represent the main usage envelope for this material. In these applications, the density near 0.935 g/cm³ provides stiffness against hydrostatic load, while the stabilizer package is selected to reduce long-term ultraviolet degradation. Chemical resistance should be evaluated for the specific liquid or vapour under ISO 175. LLDPE is generally resistant to water, aqueous salt solutions, and many dilute inorganic acids, but it can swell or stress-crack in contact with aromatic hydrocarbons, chlorinated solvents, strong oxidizers, and certain surfactant solutions. Stress-cracking resistance is particularly important for tanks containing agricultural chemicals or cleaning agents. The published ESCR value above 1000 h under ASTM D1693 is a strong indication for detergent and wetting-agent service, but the finished article should be tested with the actual service fluid at the service temperature.

Where food-contact use is proposed, the fabricator must verify that the specific grade, colour package, and processing history comply with 21 CFR 177.1520 for the United States or Commission Regulation (EU) No 10/2011 as amended in the European Economic Area. Compliance is not automatically granted by resin classification. The finished article may require overall migration testing and specific migration testing depending on food type, contact time, and temperature. Drinking-water contact parts may require additional certification through NSF/ANSI 61 or the applicable local regulation.

On production-scale rotational moulding lines, the powder is charged directly into steel or cast aluminium moulds. For parts with foam-backed walls, multi-layer construction, or internal inserts, the grade must be assessed for melt adhesion and drop resistance. When dry blending with pigments or functional fillers is required, the blend should be prepared in a high-speed mixer at temperatures below the softening point to avoid premature fusion. The final part must be inspected for wall-thickness uniformity, inner-surface porosity, and colour consistency. Dimensional acceptance should be based on the part drawing and the producer’s shrinkage factor, which is influenced by mould material, cooling rate, and wall thickness. Published data for this specific configuration is limited for multi-layer rotomoulding constructions, so prototype validation remains the controlling step before series production.