LyondellBasell Icorene 3550-6212G Light Green Polyethylene, Linear Low Density
- Product Name: LyondellBasell Icorene 3550-6212G Light Green 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 3550-6212G Light Green Polyethylene, Linear Low Density is typically used in formulations when melt flow rate, density, and UV stabilization and processing temperatures, mold temperatures, and cooling rates must be controlled within specific ranges.
| HS Code | 980274 |
| Manufacturer | LyondellBasell |
| Brand | Icorene |
| Product Name | Icorene 3550-6212G Light Green Polyethylene, Linear Low Density |
| Polymer Type | Linear Low Density Polyethylene (LLDPE) |
| Color | Light Green |
| Density | 0.935 g/cm3 |
| Melt Flow Rate | 5.0 g/10 min |
| Tensile Strength At Yield | 17 MPa |
| Tensile Strength At Break | 24 MPa |
| Elongation At Break | 800% |
| Tensile Modulus | 400 MPa |
| Flexural Modulus | 550 MPa |
| Hardness Shore D | 50 |
| Vicat Softening Temperature | 105 °C |
| Melting Point | 124 °C |
| Brittleness Temperature | < -70 °C |
| Environmental Stress Cracking Resistance | >1000 hr |
| Uv Stabilization | Yes |
| Processing Method | Rotational Molding |
| Form | Powder |
| Features | UV Stabilized, Good Impact Strength, Good Weather Resistance, Good ESCR |
| Applications | Tanks, Containers, Kayaks, Playground Equipment |
As an accredited LyondellBasell Icorene 3550-6212G Light Green 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 3550-6212G Light Green LLDPE is supplied in 25 kg polyethylene bags, palletized and stretch-wrapped for secure shipping. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): LyondellBasell Icorene 3550-6212G Light Green Linear Low Density Polyethylene in 25 kg bags, securely stowed. |
| Shipping | LyondellBasell Icorene 3550-6212G Light Green Polyethylene, Linear Low Density, is a non-hazardous, solid LLDPE resin shipped as pellets. Typical packaging: 25 kg bags, supersacks, or octabins, palletized and shrink-wrapped. Store dry, away from heat and sunlight. Transport per applicable regulations and SDS. Keep containers sealed and protected from moisture and contamination. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat, flames, and strong oxidizers. Keep original containers or bags tightly closed to prevent moisture and contamination. Place on pallets, not directly on floors, and stack securely to avoid damage. Avoid dust generation and static discharge. Follow the manufacturer’s SDS and local regulations for safe storage. |
| Shelf Life | Store in a cool, dry, well-ventilated area away from direct sunlight; shelf life is typically 24 months in unopened packaging. |
LyondellBasell Icorene 3550-6212G light green linear low density polyethylene is charged as a rotomoulding powder. In rotational moulding of 650–1,500 L chemical dosing tanks, the critical processing window is defined by internal air temperature, not oven setpoint. On a three-station carousel machine with a 3.0 m mould swing and forced-air reheating, the charge is brought through a sintering plateau of 122–126 °C and continued to a peak internal air temperature of 185–205 °C. A peak temperature below 180 °C leaves unmelted particles in the inner wall due to insufficient coalescence; sustained air temperature above 205 °C accelerates antioxidant depletion and can shift the light green shade by more than ΔE 2.0 when measured against the retained standard chip. Moulds are fabricated carbon steel or cast A356 aluminum; steel moulds require zinc phosphate or release agent break-in because the high surface area of LLDPE powder increases static adhesion to rough steel. Powder charge mass is calculated from part surface area, specified wall thickness, and powder bulk density under ASTM D1895 Method A. For a 6–8 mm wall thickness, the charge tolerance is normally held to ±2 wt% of nominal, because charge variation maps directly to local thickness changes at the parting line. Incoming powder lots are checked for melt flow rate under ISO 1133-1:2022 or ASTM D1238 at 190 °C/2.16 kg, because a shift outside the supplier specification changes powder densification rate and the required peak internal air temperature. Since published application data for this specific light green precompounded grade are limited, the thermal and process limits below are based on standard LLDPE rotational moulding practice and must be revalidated against the incoming certificate of analysis.
Compliance for outdoor storage tanks follows ASTM D1998-21 for upright polyethylene tanks. Every lot cut from the upper and lower shell is subjected to hydrostatic evaluation according to the service class; environmental stress crack resistance testing under ASTM D1693 Condition B in 10% Igepal CO-630 gives an F50 value used for lot release. The light green compound is not automatically suitable for potable water; NSF/ANSI 61-2023 verification and FDA 21 CFR 177.1520 olefin polymer compliance are required at the finished article level, with the green colorant reviewed under 21 CFR 178.3297 or EU 10/2011 positive lists. The moulder must exclude strong oxidizing acids above 40% concentration and chlorinated solvents at temperatures above 25 °C from the service envelope unless compatibility has been proven by immersion testing according to ISO 175:2010. For high-humidity sites with ambient RH >60%, the powder should be conditioned in a desiccant hopper at 60–70 °C for 2 h before charging; residual moisture is otherwise visible as pinhole clusters on the internal wall.
| Application segment | Compliance instrument | Critical material property test |
|---|---|---|
| Chemical storage tank | ASTM D1998-21; NSF/ANSI 61-2023 where potable | ASTM D1693 Condition B ESCR; ASTM D638-14 tensile at yield |
| Marine float | ISO 4892-2 weathering; ISO 179-1:2020 low-temperature impact | Wall thickness homogeneity; weld-line tensile at -30 °C |
| Playground component | EN 1176-1:2017; ASTM F1487-21 | ASTM D790-17 flexural modulus; entrapment dimensioning |
| Agricultural hopper | ISO 175:2010 chemical immersion | ASTM D638-14 tensile; ultrasonic wall thickness grid |
| Insulated fish tub | EU 10/2011; FDA 21 CFR 177.1520; 21 CFR 178.3297 colorant | ASTM D642 compression; organoleptic immersion |
| Sprayer housing | EU REACH SVHC declaration; OEM insert torque specification | ASTM D638-14; ASTM D790-17 |
What Concentrates Stress in Foam-Filled Light Green Indicating Floats?
When a light green LLDPE outer shell is filled with closed-cell polyurethane foam, the governing failure criterion is often the weld line at the two shell halves, not the membrane stress in the shell itself. The two halves are rotationally moulded separately, trimmed at the flange, preheated to 140–160 °C, and joined under a fixture that overlays a molten LLDPE band. At this join, the crystal structure is oriented by the pressing fixture, and residual stress concentrates at the inner corner where the weld band meets the shell. A typical marine float section uses 8–12 mm nominal wall with 40–50 mm corner radii; below 6 mm wall, foam exotherm creates local post-mould shrinkage dimples. The PU pour-in-place foam is usually a closed-cell system with 38–45 kg/m³ free-rise density, but exotherm in a 200 L float can raise the shell temperature past 70 °C if shot mass exceeds the shell heat sink. This forces the foam pour to be staged or cooled.
Light green is not an IALA self-luminance colour for marine marking; retroreflective tape or a compliant navigation light remains necessary for buoy identification. Weathering stability is verified separately under ISO 4892-2 with a xenon-arc source, and superficial chalking is measured as ΔE and gloss retention. The pigment package in this shade masks early chalking better than natural white; therefore specifiers must rely on laboratory ΔE rather than visual inspection. Low-temperature impact after six months in service is evaluated with ISO 179-1:2020 Charpy notched specimens cut from the float body at -30 °C; if the part is intended for ice-impact zones, the shell must not be cooled too quickly from the mould because quench-induced density gradients reduce crack propagation resistance. Vent stubs should be 6–10 mm inside diameter and packed with sintered bronze filters; foam gases must escape during pour or the shell will balloon at the flange.
Sandpit Liners and Playground Shells Without Secondary Coating
Rotational moulding trials for municipal playground components eliminate post-mould painting by using light green LLDPE in a single operation. On a carousel machine with a maximum mould swing of 2.4 m, a 5–8 mm playground shell is moulded with an internal air temperature of 190–200 °C and forced-air cooling for 20–25 min before water spray. The main process conflict is the need for low-gloss, high-impact surfaces versus the tendency to use excessive release agent; silicone release agents can create fish-eye voids on the interior surface and interfere with later adhesive bonding of foam-backed safety pads. Tensile and flexural testing follows ASTM D638-14 and ASTM D790-17 on specimens cut from the flat section of the moulded part, not from compression-moulded sheets. EN 1176-1:2017 and ASTM F1487-21 govern entrapment, corner radius, and load-bearing integrity; LLDPE lower flexural modulus compared with HDPE means roof spans above 0.8 m require double-wall ribs or a bonded steel frame. Ultraviolet exposure of the light green pigment is controlled by the compound stabilizer more than by the pigment itself; ageing is measured under the same ISO 4892-2 conditions as marine parts, with a target ΔE below 4 after 2,000 h for public furniture. The article must not be released if any steel mould flash line leaves a sharp edge; parting lines are heat-deburred and cloth-polished to avoid injury to bare skin.
When Fertilizer Hoppers Require Split-Line Flash Control
On rock-and-roll machines processing agricultural hoppers and trough sections, split-line flash behaviour differs from closed biaxial machines. The mould rotates continuously about its major axis and rocks through 45–90°; powder accumulates in corners within the hopper throat and at the split-line flange. If the split line is sealed only by a high-temperature silicone gasket, LLDPE powder of <500 µm particle size is drawn into the joint by air pressure cycles and decompresses after the mould opens as frangible flash. Fabricators cut back flash with hot air at 180–200 °C; excessive trimming force at the parting line can initiate microcracks that later propagate under fertilizer dust loading. For a 3.2 m long hopper, thickness is checked at 12 grid points with an ultrasonic gauge calibrated for LLDPE at 22 °C; thickness variation across the belly is typically held within ±15% of nominal. Chemical compatibility with liquid fertilizer pH 4–8 is acceptable for polyethylene, but prolonged contact with organic solvents or oxidizer-based disinfectants requires immersion testing to ISO 175:2010.
Cooling rate after demould is the controlling variable for flatness across 1,200 mm × 800 mm fish tub lids. A two-shell tub body uses a 6 mm outer shell and 2.5 mm inner lid shell; the closed cavity is filled with 38–45 kg/m³ rigid polyurethane foam. If the outer shell is water-quenched immediately after release, the outer surface solidifies before the inner wall and locks in a concave bow of 3–5 mm across the long axis. The accepted sequence is 5–10 min forced-air cooling inside the mould, then 15–20 min cooling in a flat fixture after demould. Polyethylene powder is dried to less than 0.05% moisture before charge; the light green colour shifts if local oven overtemperature exceeds 205 °C at the thermocouple pocket. Food-contact suitability is not automatic. For chilled fish or ice contact, the finished part must satisfy EU 10/2011 overall migration limits and FDA 21 CFR 177.1520; the green colorant itself must be authorized under 21 CFR 178.3297 or corresponding EU colourant entries. The tub cannot be used with hot filling above 60 °C because LLDPE softens and the double-wall foam loses dimensional stability. Stacking loads are tested by ASTM D642 compression, with the bottom tub in a stack of five at 2 °C.
Venting Long Sprayer Housings Without Pressure Pulse
Because the parting line is the lowest point in a long sprayer housing, vent stubs become ineffective if powder enters the tube before the wall reaches 180 °C. On a shuttle machine with a 2.8 m mould length, the tool is loaded with the vent located 180° from the fill port. During heating, the vent tube must breathe through a sintered stainless steel filter element; otherwise a pressure pulse opens the parting line and creates blow-by. Internal air temperature is held at 195–205 °C for 18–25 min depending on the 6 mm wall target; the light green shade allows early detection of carbonized powder by a slight brown shift in the filter cavity. If that shift is observed, oven temperature is reduced by 5 °C and the cycle re-qualified. Housings used as exterior panels on agricultural sprayers are not typically load-bearing; however, ASTM D638-14 and ASTM D790-17 values for the material are used to calculate vibration resonance of the panel under pump excitation. The part is secured with threaded inserts rotationally moulded into bosses; insert pull-out tests follow the insert supplier setup with a minimum torque-to-failure value determined by the OEM. The moulded panel must not be exposed to concentrated agrochemical adjuvants containing xylene or toluene during cleaning, because these solvents penetrate LLDPE and reduce tensile strength at the insert.
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- LyondellBasell Icorene 3550-6212G Light Green 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 3550-6212G Light Green Polyethylene, Linear Low Density is a pigmented linear low-density polyethylene powder supplied for rotational molding, dry blending, and sintered or compacted profile manufacture where a light green appearance through the wall thickness is required. The 3550 segment identifies the polyolefin backbone; the suffix 6212G identifies the light green color package. Published data for this specific configuration is limited, so the material should be qualified against the batch certificate and not by analogy to the natural 3550 resin. The product is a two-phase system at the microstructural level, and the pigment phase can influence apparent density, thermal stability, powder flow, and rotomolded mechanical properties.
What Does the 6212G Light Green Pigment Package Require for Incoming Quality Control?
Incoming material control begins with density and melt flow verification. Density is determined according to ISO 1183-1 or ASTM D1505, and melt mass-flow rate is measured at 190 °C under 2.16 kg according to ISO 1133-1:2022 or ASTM D1238-13. Pigment loading can shift apparent density and alter the melt-flow response relative to the uncolored base, so direct comparison with natural 3550 is meaningful only after pigment content is normalized. Batch-to-batch color consistency is measured with a spectrophotometer configured to D65/10° illumination. Because the light green designation is a control parameter rather than a decorative afterthought, visible lot-to-lot drift should trigger rejection before the powder enters the production hopper.
Mechanical acceptance should be performed on rotomolded plaques rather than compression molded sheets. Compression molding does not reproduce the rotomolding thermal history or the cooling rate that governs crystallinity in the part. Tensile properties are tested according to ASTM D638-14 or ISO 527-2, flexural modulus according to ISO 178 or ASTM D790-17, and notched Charpy impact according to ISO 179-1:2010. Environmental stress crack resistance is evaluated under ASTM D1693. For pigmented LLDPE powders, the notched impact value can be more sensitive to pigment dispersion than tensile yield stress, so impact testing should be conducted across the full batch release panel.
Powder Flow, Particle Size Distribution, and Charging Consistency
Production-scale rotational molding cells with multi-arm carousels require consistent powder flow from the charging station into the tool. Powder flow is governed by particle shape, particle size distribution, surface moisture, and electrostatic charge. A predominance of fines below 150 µm can increase agglomeration in the feed hopper, while coarse particles above 500 µm may remain discrete during the early heating stage. Particle size distribution is measured by dry sieving under ASTM D1921 or by laser diffraction under ISO 9276-1. The 6212G light green package may alter the dry-flow coefficient relative to natural 3550 because pigment particles can change interparticle friction. Published data for this specific configuration is limited, but plant-scale handling of pigmented rotomolding powders commonly requires verification of bulk density after silo transfer to prevent charge weight drift.
On a biaxial carousel machine, the operator should record charge weight, tool surface temperature, oven residence time, and peak internal air temperature rather than relying on a single machine setting. Improper charge weight produces localized thinning, especially at mold corners. In pigmented grades, poor homogenization after transportation can create color streaks because the pigment-rich fine fraction may segregate during vibratory conveying. For this reason, the powder should be homogenized before charging if the material has been stored or transported under conditions that promote segregation. Pre-drying may be required when ambient relative humidity exceeds 60 %; the exact temperature and residence time are derived from the supplier’s moisture specification and should not be inferred from other LLDPE powders.
When Oven Residence Time Must Change After a Switch From Natural 3550
If a processor replaces natural 3550 with the 6212G light green variant, the heat transfer environment changes because the pigment package can alter infrared absorption and surface emissivity. The rotomolding cycle is controlled by monitoring peak internal air temperature inside the tool with a thermocouple. The target is not the oven setpoint but the thermal history required to densify the powder and eliminate internal voids. In LLDPE rotational molding, the densification window is narrow. Under-heating creates pinholing and poor inner surface finish, while over-heating accelerates oxidation and can produce surface blemishes. For pigmented powders, oxidative induction time measured by ISO 11357-6 is a more direct batch release indicator than visual color alone. Since published data for the light green 3550-6212G configuration is limited, the exact peak internal air temperature adjustment must be established experimentally on the specific mold and arm ratio.
Thermal stability testing follows ISO 11357-6 and requires comparative analysis against the uncolored base resin. Pigments can interact with hindered phenolic antioxidants or deactivate the stabilization package. If the light green grade exhibits a lower oxidative induction time, nitrogen blanketing or reduced oven residence time may be required when processing thin-walled parts. The material should not be combined with amine-based additives without evaluating the stabilizer interaction. The cooling stage also requires control because differential shrinkage between the pigmented surface and the interior can increase warpage in large flat panels.
Comparing Rotomolded LLDPE, HDPE, and Plastomer Performance
The Icorene 3550-6212G Light Green product belongs to the linear low-density polyethylene class with a density range typically reported between 0.915 g/cm³ and 0.940 g/cm³. This distinguishes it from high-density polyethylene, which has a density at or above 0.941 g/cm³, and from low-density polyethylene, which typically lies between 0.910 g/cm³ and 0.925 g/cm³. In comparison with HDPE rotomolding powders, the LLDPE backbone delivers higher environmental stress crack resistance as measured by ASTM D1693 and lower flexural modulus as measured by ISO 178 or ASTM D790-17. Compared with LDPE, the linear backbone provides higher tensile yield stress and greater puncture resistance under ISO 6603-2. Compared with very low-density plastomers, the 3550-base material provides higher stiffness and lower elastic recovery. The 6212G light green package is a fully compounded color grade, not a dry blend of natural resin and external concentrate.
The distinction between a fully compounded pigmented powder and a dry-blended color concentrate is operationally significant. Dry blends can segregate during silo discharge and produce inconsistent color intensity or localized pigment-rich regions that reduce impact resistance. A compounded grade such as 6212G is intended to reduce that variability, but the pigment particles may still act as stress concentrators. Notched impact results should therefore be compared against the natural 3550 product under identical rotomolding conditions rather than assuming equivalence. The lower modulus and higher ESCR of the LLDPE backbone make this class suitable for parts requiring ductile failure rather than brittle cracking, but the final trade-off between stiffness and impact must be evaluated on the actual molded part.
Melt Rheology and Shear Viscosity Controls in Laboratory Extrusion
Melt rheology is characterized by capillary rheometry under ASTM D3835 at 190 °C. Rotational molding does not impose high shear rates, so the low-shear viscosity and thermal stability are more relevant than melt fracture resistance. The 3550 base may exhibit a higher viscosity than flow-modified rotomolding grades, but published data for the specific 6212G light green compound is limited. If the powder is recompounded or re-extruded for reprocessing, the pigment package can increase melt pressure in a single-screw extruder, particularly when the screw has a length-to-diameter ratio below 30:1. Process engineers should monitor drive torque and melt temperature during any reprocessing step.
Differential scanning calorimetry under ISO 11357-3 provides the melting peak and crystallization onset. Pigments can act as nucleating agents and shift crystallization onset to higher temperature during cooling. A shift in crystallization behavior can change the solidification pattern in the rotomolding mold and alter the distribution of internal stresses. For thin-walled light green parts, a rapid cool-down may increase warpage because the pigmented surface and the interior solidify at different times. Controlled air cooling should be used when dimensional stability is critical, and the cooling rate should be documented for each mold geometry.
Regulatory Verification Matrix and Documentation
Because the light green pigment package is a distinct formulation, processors must obtain batch-specific documentation. The following matrix lists the controlling test methods and their incoming-control purpose.
| Property | Method | Incoming Control Purpose |
|---|---|---|
| Density | ISO 1183-1 / ASTM D1505 | Confirms LLDPE classification; pigment loading shifts apparent density |
| Melt mass-flow rate | ISO 1133-1:2022 / ASTM D1238-13 at 190 °C, 2.16 kg | Verifies flow consistency against the natural 3550 base |
| Tensile properties | ASTM D638-14 / ISO 527-2 | Batch acceptance for rotomolded plaques |
| Flexural modulus | ISO 178 / ASTM D790-17 | Stiffness comparison against HDPE rotomolding powders |
| Impact resistance | ISO 179-1:2010 / ASTM D256 | Low-temperature ductility; notched Charpy or Izod |
| Environmental stress crack resistance | ASTM D1693 | Constant-strain cracking resistance in aggressive media |
| Oxidative induction time | ISO 11357-6 | Detects antioxidant depletion in the pigmented compound |
| Particle size distribution | ASTM D1921 / ISO 9276-1 | Controls powder flow, bridging, and wall thickness uniformity |
Food-contact status is not automatically granted by the polyolefin base. In the United States, the base resin may be evaluated under 21 CFR 177.1520; the colorants may be subject to 21 CFR 178.3297. In the European Union, compliance is evaluated under Regulation EU 10/2011 and its amendment EU 2020/1245. Registration under EC 1907/2006 and the RoHS recast Directive 2011/65/EU should be confirmed from the product safety data sheet and supplier declaration. Published data for the specific 3550-6212G light green configuration is limited; therefore, migration testing is required for food-contact or toy applications.
In rotational molding cells producing light green tanks, utility boxes, and playground components, the material is charged into steel or cast aluminum tools, heated in a forced-air oven, and then cooled under controlled conditions. The 6212G light green grade is specified where the part must have uniform color through the wall rather than surface painting. On a three-arm carousel, the process engineer records oven setpoint, cycle time, tool rotation ratio, and internal air temperature. Differences between this grade and natural or dry-blended alternatives become visible as color streaks, thickness variation, or pinholes when the powder is not homogenized after transportation or when the hopper inlet is exposed to high humidity. Pre-drying may be required if the powder has been stored at relative humidity above 60 %; the exact temperature and residence time are derived from the supplier’s moisture specification and should not be inferred from other LLDPE powders.
