LyondellBasell Icorene 3545 GRY 7839 Polyethylene, Linear Low Density
- Product Name: LyondellBasell Icorene 3545 GRY 7839 Polyethylene, Linear Low Density
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- LyondellBasell Icorene 3545 GRY 7839 Polyethylene, Linear Low Density is typically used in formulations when melt flow rate and density and rotational molding oven temperature and cooling rate must be controlled within specific ranges.
| HS Code | 349436 |
| Density | 0.934 g/cm3 |
| Melt Flow Rate | 3.5 g/10 min (190°C/2.16 kg) |
| Tensile Strength Yield | 17.0 MPa |
| Tensile Strength Break | 20.0 MPa |
| Elongation At Break | 800% |
| Flexural Modulus | 0.690 GPa |
| Hardness Shore D | 55 |
| Vicat Softening Point | 110°C |
| Melting Point | 125°C |
| Brittleness Temperature | < -70°C |
| Gardner Impact | 240 in-lb |
| Environmental Stress Crack Resistance | >1000 hr |
| Color | Grey |
As an accredited LyondellBasell Icorene 3545 GRY 7839 Polyethylene, Linear Low Density factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | LyondellBasell Icorene 3545 GRY 7839 LLDPE is supplied in 25 kg polyethylene bags, 40 bags per pallet (1,000 kg), shrink-wrapped. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with palletized 25 kg bags of LyondellBasell Icorene 3545 GRY 7839 LLDPE, shrink-wrapped and secured for transport. |
| Shipping | Shipping description: LyondellBasell Icorene 3545 GRY 7839 Polyethylene, Linear Low Density is a non-hazardous LLDPE resin supplied as grey pellets. It is typically shipped in 25 kg bags, octabins, bulk trucks, or railcars. Not DOT/IMDG/IATA regulated. Store dry, cool, and away from ignition sources. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and open flames. Keep containers tightly closed to prevent contamination and moisture pickup. Separate from strong oxidizers. Avoid dust generation and accumulation; use grounding/bonding where required. Store indoors on pallets, not directly on floor. Protect from physical damage. Maintain stock rotation. Follow manufacturer’s SDS and local regulations. |
| Shelf Life | Shelf life is typically two years from date of manufacture when stored in original packaging under cool, dry, well-ventilated conditions. |
Above-ground storage of water-polluting liquids in chemical transfer terminals places the rotomolding-grade LLDPE powder under a compliance gate that begins with EN 13575:2012 for static thermoplastic tanks and ASTM D1998-21 for upright polyethylene storage tanks. The dry-blend formulation is built on 100 phr of LyondellBasell Icorene 3545 GRY 7839; a hindered amine light stabilizer masterbatch is added at 0.3–0.6 phr to extend outdoor service, a phenolic/phosphite antioxidant package at 0.05–0.15 phr is incorporated to preserve melt-flow stability through the long oven cycle, and zinc stearate is limited to 0.1–0.2 phr where demolding release force on aluminum tooling indicates a coefficient of friction reduction is required. The powder is pre-mixed in a high-speed turbo mixer at 900–1,200 rpm until the additive masterbatch reaches dispersion with less than 0.5% sieve residue on a 250 µm screen; the mix is then charged to cast-aluminum or fabricated-steel clam-shell tools rotating at a 4:1 biaxial ratio. The oven cycle is held to an internal air temperature of 200–230°C, and the mold is cooled through water mist rather than direct quench, because cooling rates above 10°C/min in the lower sidewall radius are associated with warpage and tensile-yield loss under ASTM D638-14. Terminal parts from this configuration include vertical cylindrical tanks of 1,000–50,000 L capacity, double-wall containment sumps, and conical-bottom dosing vessels. The design boundary for this grade is the absence of a PA barrier layer; therefore chemicals requiring sub-1 g/m²/day permeation should not be assigned to monolayer rotomolding without independent barrier verification.
| Compliance gate | Standard designation | Material/part property evaluated | Test condition |
|---|---|---|---|
| Above-ground static tank design | EN 13575:2012 | Hydraulic integrity | Manufacturer pressure test per design dossier |
| Upright PE tank specification | ASTM D1998-21 | Minimum wall thickness, resin class | Dimensional verification |
| Melt flow rate | ISO 1133-1:2022 | MFR | 190°C, 2.16 kg |
| Tensile yield stress | ASTM D638-14 | Yield stress | Type IV specimen, 50 mm/min |
What Limits the Internal Air Temperature Window in Ribbed Potable-Water Cistern Tooling?
Rainwater harvesting cisterns with molded-in access ribs, tank bosses, and slosh baffles place a different thermal demand on the powder than smooth-wall chemical tanks. The potable-water compliance path for the finished part is governed by NSF/ANSI/CAN 61 for drinking water system components and AS/NZS 4020:2018 where the cistern is installed in Australia or New Zealand; if the cistern is repurposed into the food-contact periphery, FDA 21 CFR 177.1520(c) and Regulation (EU) No 10/2011 become applicable. The compounding window is deliberately narrow: a titanium dioxide-based white masterbatch is dry-blended at 0.5–1.5 phr, and lubricating additives are excluded because even 0.05 phr of zinc stearate elevates total organic carbon extraction in the NSF/ANSI/CAN 61 test sequence. The rotomolding process holds the peak internal air temperature at 195–220°C; below 185°C the powder particles fail to coalesce at the base of the ribs, leaving pinhole defects at wall thicknesses under 4 mm, while above 230°C oxidative chain scission is observed as a drop in notched Izod impact under ISO 180:2019. Cooling is ramped at 4–6°C/min to avoid inducing residual stress at the rib root. Finished products include buried and above-ground potable-water cisterns of 500–20,000 L, rainwater harvesting cells, and potable water transport skids. The operational boundary is the lack of chlorine dioxide barrier at elevated service temperatures; long-term exposure above 40°C requires a sacrificial liner or a different resin layer.
| Contact regulatory gate | Standard/regulation | Measured parameter | Test basis |
|---|---|---|---|
| Drinking water system components | NSF/ANSI/CAN 61 | TOC, extractable metals | Exposure water per standard protocol |
| Australia/NZ potable water | AS/NZS 4020:2018 | Taste, appearance, microbial growth | Total immersion or surface exposure |
| Food-contact olefin polymers | FDA 21 CFR 177.1520(c) | Extractables | Per 21 CFR extraction conditions |
| EU food-contact plastics | Regulation (EU) No 10/2011 | Overall migration | 10 mg/dm² or 60 mg/kg |
Marine Buoy Skins and the HALS Depletion Limit Under ASTM G154 Weathering
Mooring buoys and floating dock cubes expose the LLDPE skin to continuous seawater immersion and cyclic UV; accelerated aging programs track chalking and embrittlement through ASTM G154-16 and ISO 4892-3:2016 cycles. The stabilizing package is loaded at 0.4–0.8 phr hindered amine light stabilizer, 0.1–0.3 phr of an o-hydroxy phenyl benzotriazole UV absorber, and 1.0–2.0 phr of marine-grade pigment masterbatch; loadings below 0.3 phr HALS produce surface chalking after 1,500–2,000 h of xenon-arc exposure in laboratory screening. The production route uses a double-wall rotational molding sequence in which the outer skin is molded first, the mold is opened while still warm, and a closed-cell polyurethane foam with a core density of 80–120 kg/m³ is injected between the inner and outer shells. Insert over-molding of stainless steel mooring eyes requires preheating the insert to 80–100°C to avoid thermal shock cracking at the insert interface. Terminal products include navigation buoys with displacement of 0.5–5 m³, marina dock floats, and aquaculture cage collars. The limitation is abrasion; the LLDPE surface is not suitable for ice-impact zones without sacrificial fendering or ultra-high-molecular-weight polyethylene wear strips.
When Fuel Contact Requires Surface Fluorination After the Rotational Demolding Stage
Diesel storage systems and hydraulic oil reservoirs made from LLDPE rotomolding powder require a post-mold barrier approach because the base ethylene polymer is not a fuel permeation barrier at wall thicknesses below 6 mm. The formulation for electrostatic discharge safety adds a static-dissipative carbon black masterbatch at 1.0–2.5 phr, targeting a surface resistivity of 104–106 Ω/sq when measured under ASTM D257-14 at 500 V and 50% relative humidity. The rotational molding process uses a peak internal air temperature of 200–225°C, a 4:1 rotation ratio, and a minimum wall thickness of 5 mm at the lowest fuel-wetted point. After demolding, the tank is subjected to surface fluorination with a 1–2% fluorine-in-nitrogen atmosphere at 25–60°C for 30–120 min; published data for this specific grade and fluorination combination is limited, so coupon screening under ASTM D2684 or a gravimetric permeation cell is required before release to production. The relevant equipment compliance boundary is UN ECE R34 for plastic fuel tanks when fitted to agricultural vehicles, and ISO 21487 for small-craft diesel tanks where applicable. Terminal products include diesel tanks of 20–200 L, fuel caddies, and hydraulic oil reservoirs. The operational boundary is the post-fluorination shelf life; re-cutting or drilling after fluorination destroys the barrier layer at the cut edge and requires re-treatment.
Insulated fish totes and temperature-controlled pharmaceutical bins use the powder as the outer structural shell because the 250–500 µm particle size distribution allows uniform fusion across the 3–8 mm wall thickness range without a separate compounding step. The food-contact qualification is limited to the outer shell; any inner cavity liner must be qualified separately under FDA 21 CFR 177.1520(c) and Regulation (EU) No 10/2011 if direct product contact occurs. A food-grade pigmented masterbatch is dry-blended at 0.5–2.0 phr, and an acid scavenger based on zinc oxide or hydrotalcite is held to 0.02–0.05 phr to prevent organoleptic transfer while maintaining color stability. The process runs as a twin-wall rotational molding cycle: the outer shell is molded to a wall thickness of 3–5 mm, cooled to 70–80°C, and then polyurethane foam with a density of 40–60 kg/m³ is injected through the base boss to provide thermal insulation. Terminal products include 200–1,000 L fish totes, insulated food distribution boxes, and pharmaceutical cold-chain outer shells. The limitation is oxygen ingress: the LLDPE shell provides no oxygen barrier below 1,000 cm³/(m²·day·atm); oxygen-sensitive payloads require a vacuum-sealed secondary liner or a different barrier layer.
Electrostatic Discharge Attenuation in Dry-Bulk Icorene Structures; Carbon Black Percolation and Mold-Flow Viscosity
Dry-bulk hoppers, chutes, and transfer bins handling combustible dusts require the rotomolded part to dissipate static charge without the use of hygroscopic antistatic agents that wash out after repeated cleaning. The compliance framework for the finished component is ATEX Directive 2014/34/EU for equipment intended for use in explosive atmospheres and ASTM D257-14 for surface resistivity, with IEC 60079-32-2:2015 providing guidance on electrostatic hazards. The dry-blend formulation incorporates a conductive carbon black masterbatch at 2.0–6.0 wt%, which drives surface resistivity below 106 Ω/sq at 500 V; below 2.0 wt% the resistivity remains above 1012 Ω/sq and the part is non-compliant for Group II dust atmospheres. The process penalty is increased melt viscosity: the carbon black network raises the torque demand on the biaxial arm and requires the peak internal air temperature to be held at 210–230°C to eliminate flow lines. Mold surface roughness should not exceed 0.8 µm Ra because micro-roughness traps carbon black and produces hot spots that can lead to dust accumulation on the part. Terminal products include ESD dry-bulk bins, hopper bodies, and transfer chutes for pharmaceutical granulation, plastic compounding, and powder-coating transfer lines. The operational boundary is the loss of conductivity after aggressive abrasion; if the carbon black network is disrupted by wear beyond 0.2 mm surface removal, the part must be re-evaluated under ASTM D257-14 before returning to explosive-atmosphere service.
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- LyondellBasell Icorene 3545 GRY 7839 Polyethylene, Linear Low Density is manufactured under an ISO 9001 quality system and complies with relevant regulatory requirements.
- COA, SDS/MSDS, and related certificates are available upon request. For certificate requests or inquiries, contact: sales8@ascent-chem.com.
LyondellBasell Icorene 3545 GRY 7839 Polyethylene, Linear Low Density is a linear low density polyethylene powder supplied in a grey 7839 color variant. The grade designation 3545 corresponds to a nominal density of 0.935 g/cm³ and a melt flow rate of 4.5 g/10 min at 190 °C under a 2.16 kg load when tested according to ISO 1183-1 and ISO 1133-1. The product is intended for rotational molding, where the LLDPE backbone provides higher environmental stress crack resistance and lower temperature impact than HDPE rotomolding grades of equivalent melt flow rate. The grey color code 7839 distinguishes the variant from natural and black powders; it is specified for outdoor and industrial parts in which visible soiling, surface marking, or post-mold painting should be reduced.
Typical part applications include rotationally molded tanks, agricultural equipment covers, outdoor enclosures, and material-handling containers. The grey pigmentation does not guarantee UV protection of the underlying polymer unless a separate light stabilizer package is present. If a specific color standard such as RAL or Pantone must be matched, the processor should verify the molded part color under D65 illuminant against the reference, because powder shade and molded part appearance may differ due to surface texture and crystallinity.
Representative mechanical values published for the grade include tensile stress at yield of 16 MPa, tensile modulus of 480 MPa, and elongation at break greater than 800 % under ISO 527-2. Flexural modulus is reported at 550 MPa under ISO 178. Charpy notched impact at 23 °C is reported as no break under ISO 179-1; at -40 °C the reported value is approximately 6 kJ/m². Environmental stress crack resistance measured by ASTM D1693-15 exceeds 1000 h in 100 % Igepal at 50 °C. Vicat softening temperature is reported near 105 °C under ISO 306, and the crystalline melting peak is near 126 °C under ISO 11357-3.
| Property | Typical value | Test method |
| Density | 0.935 g/cm³ | ISO 1183-1 |
| Melt flow rate at 190 °C/2.16 kg | 4.5 g/10 min | ISO 1133-1 |
| Tensile stress at yield | 16 MPa | ISO 527-2 |
| Tensile modulus | 480 MPa | ISO 527-2 |
| Elongation at break | 800 % | ISO 527-2 |
| Flexural modulus | 550 MPa | ISO 178 |
| Charpy notched impact at 23 °C | no break | ISO 179-1 |
| Charpy notched impact at -40 °C | 6 kJ/m² | ISO 179-1 |
| Vicat softening temperature | 105 °C | ISO 306 |
| Melting temperature | 126 °C | ISO 11357-3 |
| ESCR, 100 % Igepal, 50 °C | 1000 h | ASTM D1693-15 |
The table values are supplier nominal values, not independent specifications. Lot-to-lot variation can occur under the supplier’s test protocol; incoming inspection should verify melt flow rate and density against the certificate of analysis before production. The public datasheet does not specify the comonomer identity in all versions. For applications requiring solubility, permeability, or food-contact modeling, the comonomer type should be confirmed with the supplier.
What Distinguishes Icorene 3545 GRY 7839 from HDPE Rotomolding Powders?
The material selection difference between Icorene 3545 GRY 7839 and a conventional HDPE rotomolding powder is a trade-off between stiffness and toughness. A typical HDPE rotomolding grade at 0.945 g/cm³ has a flexural modulus above 900 MPa; Icorene 3545 GRY 7839 is reported at 550 MPa. The lower crystallinity and density indicate lower yield stress but improved low-velocity impact and stress crack performance. This distinction matters for tanks subjected to freeze-thaw expansion, agricultural equipment receiving low-velocity impacts, and outdoor enclosures exposed to ground movement or frequent thermal cycling.
Compared with a metallocene-catalyzed LLDPE rotomolding powder at the same melt flow rate, this grade may exhibit a broader molecular weight distribution and lower flow-induced stiffness if the catalyst system is conventional Ziegler-Natta. The public product data do not always state the catalyst type; direct substitution should be validated with Charpy impact, ESCR, and warpage measurements on the same tooling.
Compared with high-pressure LDPE powder of the same density, the linear designation indicates the absence of long-chain branching. This structural difference generally gives lower melt elasticity, different bubble rupture behavior in the melt, and higher tensile properties at equivalent density. These differences appear in processing behavior and mechanical fracture mode rather than only in the final part surface.
In chemical storage service, the stress crack resistance of linear low density polyethylene generally exceeds that of high-pressure LDPE and HDPE of similar melt flow rate. Resistance varies with the chemical environment, temperature, and molded-in stress. Validation should follow ASTM D543-21 for chemical interaction under service loads. Published data for the grey variant in specific chemical solutions are not always available, so pilot testing with the actual agent is required.
On a production carousel machine, the powder is charged into the mold after conditioning at 15 °C to 30 °C. Cold powder below this range can carry condensation into the mold; hot powder above 40 °C can clump during charging and create uneven wall thickness. The oven set point is typically 280 °C to 320 °C, and air velocity should be above 3 m/s to maintain heat transfer into the powder bed. Heating should not be terminated by cycle time alone; peak internal air temperature should reach 190 °C to 210 °C for sections up to 6 mm. Holding the internal air temperature in the upper part of this band for 3 min to 5 min is used to complete sintering and remove entrapped air.
The mold rotation ratio is commonly 4:1 primary to secondary axis on standard equipment. For asymmetric parts with deep recesses, the ratio may be shifted to 5:1 or 3:1, but no universal setting applies; the optimum is validated by measuring wall thickness at corners and baffle regions. Internal air temperature variation of ±5 °C across a mold has a greater influence on warpage than the oven set point in many tooling configurations.
The powder bed densifies through a sintering sequence in which the melt temperature and internal air temperature rise at different rates. Because heat transfer is conducted through the mold wall, large steel molds with wall thickness above 8 mm require longer oven cycles than aluminum molds of the same geometry. Aluminum tooling is used for prototyping due to higher thermal conductivity; steel tooling is used for long production runs. The thermal lag between the mold surface and the internal air is measured with a rotolog or equivalent data logger; cycle optimization should not rely on external mold surface temperature alone.
Cooling is performed with forced air before water mist. Rapid water quenching can increase impact properties but increases distortion risk in flat panels. Slow cooling improves dimensional stability but may reduce ESCR. Demolding should not occur above 70 °C; ejection above this temperature is associated with post-mold shrinkage and warpage because the polymer remains softer than its final service state.
When Oven Residence Time Exceeds 40 Minutes
Extended oven dwell above 260 °C can exhaust the antioxidant package and shift color. The grey pigment may absorb infrared more readily than a natural powder; surface temperature at the polymer-air interface can exceed the internal air temperature under high heater output. Processors should monitor the oxidative induction time according to ISO 11357-6 using a sample from the molded part if the cycle exceeds 40 min or if the part has been remolded. A significant decrease in OIT indicates that the resin has consumed part of its stabilization package, not necessarily that the part has failed, but that long-term heat aging resistance is reduced.
Mold release agents and internal air release additives must be selected for compatibility with the olefin matrix. Fluoropolymer-based processing aids and siloxane-based release agents are commonly used in rotomolding, but the supplier does not publish complete interaction data for this grey variant. A trial on the same tooling is required before changing the external release formulation.
Published data for this specific grey configuration are limited for long-term UV retention. Outdoor weatherability should be evaluated by ISO 4892-2 or ASTM G154 on the molded part, not on the powder, because pigment dispersion and surface morphology affect exposure results. The presence of grey pigmentation does not guarantee protection of the underlying polymer from UV without a specific light stabilizer package.
Storage, Handling, and Regulatory Screening
The powder is supplied in sealed packaging and should be stored below 40 °C and at relative humidity below 60 %. Polyethylene is not hygroscopic, but condensation caused by temperature cycling can introduce moisture into the mold. Moisture at the mold surface is a known cause of pinholes, internal bubbles, and poor surface finish in rotomolding. Bags should be re-sealed after sampling and kept away from direct sunlight and open heat sources.
For industrial compliance, the base polyolefin is typically screened under REACH Regulation (EC) 1907/2006 and the EU RoHS Directive 2011/65/EU. RoHS restricted substances, including cadmium, lead, mercury, and hexavalent chromium, are limited to 1000 mg/kg in homogeneous materials unless an exemption applies. Food-contact use requires a separate determination; the grade may meet the base-resin requirement of FDA 21 CFR 177.1520(c) or EU Regulation 10/2011, but the grey pigment package and any processing aids require specific confirmation for the final article.
Contamination with high-flow injection molding polyethylene or polypropylene should be avoided. Small additions of a high-melt-flow polymer can shift the melt flow rate above the intended range and reduce Charpy notched impact. Regrind from the same grade can be incorporated only after verifying that the melt flow rate remains within 0.5 g/10 min of the virgin value and that the notched impact requirement is retained. The supplier’s published data do not define a universal regrind limit for this grey variant.
