LyondellBasell Icorene 3560 CM GRY 7225 Polyethylene, Linear Low Density
- Product Name: LyondellBasell Icorene 3560 CM GRY 7225 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 3560 CM GRY 7225 Polyethylene, Linear Low Density is typically used in formulations when melt flow rate and density, and processing temperature and cycle time must be controlled within specific ranges.
| HS Code | 544510 |
| Polymer Type | Linear Low Density Polyethylene (LLDPE) |
| Density | 0.935 g/cm³ |
| Melt Flow Rate | 6.0 g/10 min (190°C/2.16 kg) |
| Tensile Strength At Yield | 17.0 MPa |
| Tensile Strength At Break | 24.0 MPa |
| Elongation At Break | >700% |
| Flexural Modulus | 750 MPa |
| Vicat Softening Temperature | 113 °C |
| Brittleness Temperature | < -70 °C |
| Hardness Shore D | 55 |
| Color | Grey |
| Uv Stabilization | Yes |
| Processing Method | Rotational Molding |
As an accredited LyondellBasell Icorene 3560 CM GRY 7225 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 3560 CM GRY 7225 typically comes in 25 kg polyethylene bags, palletized and stretch-wrapped for safe transport. |
| Container Loading (20′ FCL) | 20′ FCL loaded with 25 kg bags of LyondellBasell Icorene 3560 CM GRY 7225 Linear Low Density Polyethylene, securely palletized. |
| Shipping | Icorene 3560 CM GRY 7225 Linear Low Density Polyethylene is a non-hazardous solid resin. It is not regulated for DOT, IMDG, or IATA transport. Ship in sealed bags, octabins, or bulk trucks. Keep dry, avoid excessive heat, sunlight, and contamination. Use standard PPE when handling. |
| Storage | Store LyondellBasell Icorene 3560 CM GRY 7225 Polyethylene, Linear Low Density in a clean, dry, well-ventilated area at ambient temperature. Keep sealed in original packaging, palletized off the floor. Protect from direct sunlight, heat, ignition sources, moisture, and strong oxidizers. Avoid contamination and dust; clean spills promptly because pellets can be slippery. Follow SDS and local regulations. |
| Shelf Life | Stable polymer; no defined shelf life when stored cool, dry, in original packaging, away from heat, sunlight, and contaminants. |
In potable water storage tank rotational molding, the charge weight for Icorene 3560 CM GRY 7225 is calculated from part projected area, specified wall thickness and melt-state density, with an additional 3–5 wt% process allowance for sacrificial edge trim and leak-test port plugs. The compound is charged at 100 wt% as received for the certified potable-water contact layer. Clean internal regrind from the same gray linear low-density polyethylene grade is held to a maximum addition of 10 wt% in tank shells that must retain NSF/ANSI 61 listing, and regrind exceeding this fraction is isolated for non-potable secondary containment shells. The processing window on a shuttle-type rotational molding machine is controlled by peak internal air temperature rather than oven set point alone; the powder charge has typically sintered and densified when peak internal air temperature reaches 215–235 °C. If peak internal air temperature falls below 205 °C, production-line failure is observed as micro-pinholing at the inside radius of baffle bosses and around stainless steel flange inserts because flow fronts from adjacent powder particles do not fully coalesce at low internal pressure. Mold rotation ratios of 4:1 to 4.5:1 on perpendicular axes maintain wall thickness distribution; the outer mold surface is held between 260 °C and 300 °C in the oven, depending on wall thickness. Compliance documentation for water-contact use references FDA 21 CFR 177.1520 for olefin polymer contact, EU 10/2011 with overall migration at or below 10 mg/dm², AS/NZS 4020 for drinking water contact trials, and ASTM D1998-21 for upright polyethylene storage tanks where the vessel is not regulated as a pressure vessel. Terminal finished product types include vertical potable water storage tanks, rectangular emergency reserve tanks, baffled mobile spray tanks, and irrigation header tanks with spin-welded fittings.
Formulation addition of pigment or ultraviolet masterbatch is not required in this tank category because the grade is supplied as a finished gray compound, and uncontrolled let-down of additional colorant can shift melt flow and reduce weld-line strength at spin-welded bosses. The operational boundary is the removal of surface condensation. When powder is stored at relative humidity above 60% and then moved into an air-conditioned molding hall, condensation forms on cold powder surfaces; the charge should not be bagged until surface condensate has evaporated because trapped water becomes steam during the oven cycle and creates voids along the inner skin.
How Does Environmental Stress Cracking Resistance Set the Regrind Ceiling in Agricultural Chemical Containment?
When the same gray linear low-density polyethylene rotomolding powder is used for agricultural chemical storage, stress cracking resistance becomes the controlling property because pesticide adjuvants, surfactants and polar solvents behave as stress-cracking agents under molded-in residual stress. The grade is charged at 100 wt% as supplied for primary containment walls. Clean internal regrind is limited to 10–15 wt%; for tanks intended to hold organophosphate or surfactant-heavy formulations, the lower 10 wt% limit applies because additional regrind reduces the notched constant-strain environmental stress cracking resistance measured by ASTM D1693-15 in 100% Igepal CO-630 at 50 °C. Incorporation of more regrind moves failure from ductile to brittle at the insert collar, a phenomenon observed as V-shaped cracks radiating from spin-welded outlet bosses. The process uses carousel or shuttle machines with steel or cast aluminum tools; peak internal air temperature is held at 220–240 °C, and the cooling phase is extended with forced air at 0.5–1.5 m/s before water spray to reduce molded-in stress in the boss area. Compliance may include static tank evaluation under ASTM D1998-21 where vessel geometry is similar, plus chemical compatibility testing with the specific formulation at 40 °C for 30 days. Terminal finished product types include tractor-mounted sprayer tanks, fertigation reservoirs, chemical induction hoppers, secondary containment basins and chemical intermediate bulk container shells when fitted with external steel frames and type-tested under the applicable UN modal regulations. Published data for this specific CM GRY 7225 configuration under full UN 31H1/Y certification is limited and requires part-specific testing.
The main production bottleneck is the generation of fines below 200 mesh during ambient pulverization. Fines migrate to the inner skin during the first rotation stage, causing a glossy starved patch around the fill port. Maintaining the 200-mesh fraction at or below 5 wt% and limiting recirculated powder to dry, contamination-free material prevents this surface defect. Mold release selection is also narrow; silicone-containing release agents can transfer to the molded surface and interfere with post-molding hot-gas welding of couplers, so non-silicone release films are used when welded connections are present.
Because the short-chain branching distribution of linear low-density polyethylene delays brittle transition under slow bending, insulated fish boxes and meat lugs are rotationally molded with wall sections between 6 mm and 12 mm, where the part must survive drop impact at −20 °C and repeated hot-water sanitation cycles. Icorene 3560 CM GRY 7225 is used at 100 wt% for the food-contact layer. Where a two-layer wall is molded, the outer layer may contain up to 20 wt% clean internal regrind of the same grade, but the inner layer remains virgin to maintain FDA 21 CFR 177.1520 compliance and EU 10/2011 overall migration at or below 10 mg/dm². Food-processing equipment in North America may additionally require certification to NSF/ANSI 2 for equipment surfaces that contact unpacked food. The process requires slower cooling after demold: a cooling rate of 5–10 °C/min through the crystallization plateau lowers post-molding warpage of large flat sidewalls; rapid water quench on one side alone produces concave bowing visible after the first hot-water sanitation cycle. Production machines are typically rock-and-roll or shuttle units with charge ratio calculated from projected area and nominal wall. Terminal finished product types include insulated fish totes, meat lug interiors, poultry plucking tub lining, bulk food handling bins and food transport buggies used in cold-chain plants.
In this application the primary operational limit is exposure to alkaline cleaning agents; alkaline washdown at pH above 10 and 80 °C can increase surface oxidation at the inner wall over repeated cycles, especially when regrind-rich outer layers are present. Published data for this specific gray compound under all commercial sanitation protocols is limited, so quarterly visual inspection of inner-wall stress whitening is used as a production-line control.
| Application zone | Maximum clean internal regrind | Controlling test or code | Primary risk above ceiling |
|---|---|---|---|
| Potable water storage | 10 wt% | NSF/ANSI 61, ASTM D5628-18 | Pinholing at flange inserts; reduced ARM impact |
| Agricultural chemical containment | 10–15 wt% | ASTM D1693-15, ASTM D1998-21 | Brittle V-cracking from outlet bosses |
| Food-contact material handling | 20 wt% in outer layer only | FDA 21 CFR 177.1520, EU 10/2011 | Drop-impact loss in cold-chain service |
| Outdoor furniture and playground | 15 wt% in non-load-bearing areas | ASTM D256-10, ASTM D4329-21 | Low-temperature impact loss; color shift |
| Marine floats and pontoons | 15 wt% | USCG 33 CFR 183.114, ASTM D2842-19 | Inner-skin voiding at foam exotherm |
| Buried utility enclosures | 15–25 wt% in non-structural ribs | ASTM D638-14, ASTM D2412-21 | Crack initiation at conduit entry corners |
Weathering Performance and UV Stabilizer Distribution in Outdoor Rotomolding
After the mold is charged with Icorene 3560 CM GRY 7225 and rotated through a shuttle oven, the outer mold-surface layer develops a fully pigmented gray skin whose long-term color retention depends on correct cooling and avoidance of excessive internal regrind. For outdoor furniture and playground components, clean internal regrind is added up to 15 wt% for non-load-bearing panels and decorative panels; load-bearing seat shells and climbing platform supports are molded at 100 wt% as supplied to retain the low-temperature impact required by ASTM D256-10 notched Izod and ASTM D5628-18 ARM impact. Outdoor weatherability evaluation references ASTM D4329-21 fluorescent UV exposure and ISO 4892-2:2013 xenon arc testing; playground-specific mechanical performance is evaluated under ASTM F1487 for public playground equipment. Compliance with REACH Annex XVII and RoHS Directive 2011/65/EU applies to the finished article, but the polymer matrix itself is not classified as hazardous under these restrictions. The process window runs with peak internal air temperature 210–230 °C; at the lower end of this range, incomplete pigment dispersion at sharp corners appears as lighter gray marbling, while at the higher end prolonged oven dwell shifts the surface to a lower-gloss, dry appearance due to thermal oxidation. Finished product types include park benches, picnic table end frames, waste receptacle bodies, playground step panels, and outdoor equipment enclosures with molded-in brass or stainless inserts.
Production-line experience shows that color variation across a multi-cavity tool is most often caused by uneven powder distribution during the first 30 seconds of biaxial rotation; a 4.5:1 rotation ratio with an intermediate dwell at 45 ° reduces pigment concentration differences between the lid and sidewall. Mold release selection is constrained by the need for a non-glossy surface on site furniture, so semi-permanent release systems are preferred over high-slip spray films that can telegraph through and create visible gloss bands.
When Float Shells Are Filled With Closed-Cell Foam After Primary Molding
Marine float molds with multi-part split lines and brass mooring inserts are often charged with 100 wt% linear low-density polyethylene rotomolding compound because the shell wall must retain ductile impact at water temperatures near 0 °C and resist crack propagation around high-load insert bosses. Clean internal regrind is limited to 15 wt%, and only when the recirculated powder is dry and screened below 200 mesh at or below 5 wt% fines; higher fines fractions increase the occurrence of inner-skin voids where the foam fill later exotherms. After the shell has cooled below 50 °C, a two-part closed-cell polyurethane foam system is injected at a free-rise density of 38–60 kg/m³. The foam fill ratio is determined by net internal cavity volume and required reserve buoyancy, not by polyethylene shot weight; typical overpack is 10–15 vol% to account for foam shrinkage after cure. Standards applied to flotation materials include USCG 33 CFR 183.114 for recreational boat flotation and ASTM D2842-19 for water absorption of the closed-cell foam; the polyethylene shell itself is evaluated by ASTM D638-14 tensile and ASTM D256-10 Izod at ambient and low temperature. The main process conflict is foam exotherm above 120 °C, which can soften the solid LLDPE shell at the inner wall and create localized sink marks visible on the outside of the float. This is controlled by filling in two to three lifts with inter-stage cooling to 45 °C. Terminal finished product types include dock floats, pontoon sections, buoyancy billets, fender shells, and mooring buoy bodies. Published data for this specific CM GRY 7225 configuration under full marine fouling and seawater immersion testing is limited; part-specific water absorption and insert pull-out testing are necessary for marine certification.
Injection of foam into a shell that has not fully cooled below 50 °C creates a different failure mode: the internal pressure from expanding foam can reverse-draw angular flat panels during exotherm, causing the shell to bulge outward and disrupting the waterline geometry. The molding line therefore uses mold surface thermocouples on the thickest insert boss until the reading is below 50 °C before the foam lance is inserted.
Evaluating Soil Load Capacity and Low-Temperature Impact in Buried Utility Housings
Underground enclosures molded in linear low-density polyethylene must accommodate vertical soil load, cyclic wheel loading and occasional submersion without brittle crack propagation at stress concentrations around conduit entry bosses. The charge is 100 wt% as-supplied compound for load-bearing sidewalls; clean internal regrind at 15–25 wt% is limited to non-structural ribs and covers with local wall thickness above 8 mm. Mechanical property verification references ASTM D638-14 tensile yield and elongation, ASTM D790-17 flexural modulus, and ASTM D648-16 deflection temperature under load at 0.45 MPa. For tubular or vault sections under parallel-plate loading, ASTM D2412-21 may be applied to measure ring stiffness, although enclosure-specific soil-structure interaction designs typically use finite-element validation rather than a single test value. The process control range uses peak internal air temperature 220–240 °C and a slow cooling phase in forced air because buried enclosures are more sensitive to residual stress at thick-thin transitions than exposed products. Finished terminal types include utility pull boxes, valve boxes, septic chamber segments, stormwater infiltration basins, and underground splice enclosures with molded-in conduit stubs.
Soil load failures in production trials are usually not ductile wall collapse but crack initiation at sharp corners of the access opening after repeated wheel loading simulations; rounding the access opening radius to at least 6 mm and removing internal regrind from that local region are the standard corrective actions. The material should not be dry-blended with high-molecular-weight HDPE rotomolding powders without compatibility testing, because differences in crystallinity and melt viscosity produce internal weld planes that reduce drop impact at the interface.
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- LyondellBasell Icorene 3560 CM GRY 7225 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 3560 CM GRY 7225 is classified as a linear low density polyethylene compound supplied in grey-coloured compression/rotational moulding powder form. The designation embeds a base resin identifier, a processing suffix, and a pigment code. Commercial linear low density polyethylene powders in this category typically exhibit a density between 0.910 g/cm³ and 0.940 g/cm³ under ISO 1183-1:2019; a melt mass-flow rate between 2 g/10 min and 8 g/10 min under ISO 1133-1:2022 at 190°C/2.16 kg; and a peak melting temperature near 120°C to 126°C by differential scanning calorimetry under ISO 11357-3:2018. These ranges are not grade-specific release values; lot-specific data on the certificate of analysis control the use of Icorene 3560 CM GRY 7225.
Distributor datasheets occasionally omit the exact additive package and pigment loading; therefore, secondary summaries should not be used for product qualification. The grey 7225 pigment code is a supplier colour reference, not an automatic RAL match; a spectrophotometric assessment under ASTM D2244-23 is necessary when assembled components must appear uniform. The CM processing designation distinguishes powder-grade rotational/compression moulding feedstock from pelletised extrusion or injection moulding equivalents. In powder form, particle size distribution, bulk density, and dry-flow properties affect cavity fill and wall thickness distribution in biaxially rotating tools. A pelletised linear low density polyethylene with the same base density and melt index does not produce equivalent moulding performance in a rotational mould because the heat-transfer surface area, densification rate, and air release mechanism differ. The grey pigment package further modifies heat absorption and surface appearance; therefore, process conditions originally developed for natural linear low density polyethylene powder must be revalidated when switching to the pigmented grade.
What Processing Limitations Arise from the Linear Low Density Architecture During Rotational Moulding?
Linear low density polyethylene contains short-chain branches distributed along a predominantly linear backbone. This architecture yields different crystallisation and rheological behaviour than long-chain branched low density polyethylene. In rotational moulding, the powder bed transitions through densification, sintering, bubble dissolution, and melt crystallisation. Linear low density polyethylene often exhibits a narrower melting endotherm and higher low-shear melt viscosity than low density polyethylene at equivalent melt index. The practical consequence is that peak internal air temperature must be higher and dwell time must be longer to reduce residual bubble content. Industry-published process guides for rotomoulding polyolefins commonly indicate peak internal air temperatures between 190°C and 220°C, with oven set points between 280°C and 300°C. For Icorene 3560 CM GRY 7225, published grade-specific cycle data are limited; these values should be treated as preliminary processing boundaries until confirmed by instrumented mould trials.
The grey pigmentation changes radiant heat absorption. Darker surfaces may reach peak internal air temperature earlier than natural material. If the oven set point is not reduced, inner-surface thermo-oxidative degradation may proceed before the core is fully sintered. This degradation generates carbonyl species, lowers notched impact strength under ISO 179-1:2020, and can shift colour. Mould temperature sensors should be positioned at the thinnest and thickest tool walls because a single oven air thermocouple cannot capture part surface overheating. Bubble removal requires internal mould pressure or inert gas pressurisation in some tooling. Residual bubbles in linear low density polyethylene rotomoulded parts reduce low-temperature impact. Process trials should map internal air temperature versus bubble density using cross-sectional microscopy after density measurement by ISO 1183-1:2019.
On production-scale carousel and shuttle machines, dry-flow consistency controls cavity fill. Apparent density and pourability can be compared using ASTM D1895-96(2010)e1 or ISO 60:1977. A powder with excessive fines may form agglomerates that bridge across feed ports, producing non-uniform wall thickness. Equipment manufacturers note that non-uniform powder distribution can create wall thickness variation greater than 10% in large double-wall tools. Particle size distribution is typically evaluated by air jet sieve according to ASTM D1921-18 or ISO 4610:2001. Oversize fractions may cause melt defects, while excessive fines may lower bulk density and create dry-flow bridging.
Although base linear low density polyethylene is not hygroscopic, surface condensation on cold powder returned from storage can cause steam-induced pinholes. Where powder temperature is below the shop dew point, pre-conditioning at 50°C to 60°C for 2 h to 4 h in a desiccant dryer is a conservative practice. The supplier drying recommendation for Icorene 3560 CM GRY 7225 should supersede generic guidance. Melt rheology measured by capillary rheometry under ISO 11443:2021 at 190°C shows that linear low density polyethylene has a less pronounced shear-thinning response than low density polyethylene. The lower shear-thinning index means viscosity remains higher at low shear rates; this is relevant because rotomoulding densification occurs at low shear and is governed by sintering rather than high-shear flow. In contrast, injection moulding uses high shear to fill a closed mould, so the same linear low density polyethylene architecture may require increased injection pressure and a larger clamp force per projected cavity area. Direct translation of injection moulding parameters to rotational moulding is not valid.
When Oven Setpoint Variation Exceeds ±5°C on Multi-Station Carousel Machines
Multi-station carousel ovens can exhibit burner gas modulation and air flow non-uniformity exceeding a setpoint tolerance of ±5°C. For linear low density polyethylene, a melting range narrower than low density polyethylene amplifies the impact of such variation. If the mould surface remains below the lower end of the sintering envelope, incompletely fused polymer produces residual weld lines and low elongation at break under ISO 527-2:2012. If the upper boundary is exceeded, internal air pressure may still appear acceptable while oxidative chain scission and pigment-vehicle degradation reduce Charpy impact under ISO 179-1:2020. Each cavity should be instrumented with internal air temperature probes; oven air temperature alone is insufficient for a pigmented linear low density polyethylene powder. Data loggers with sampling intervals of 1 s or less can resolve transient temperature overshoot during burner modulation.
Cycle development for linear low density polyethylene rotomoulding frequently requires a heating phase of 10 min to 20 min per centimetre of wall thickness, followed by controlled cooling with forced air and a demoulding temperature below 80°C. Cooling rate alters crystallinity: fast cooling retains lower crystallinity and often improves impact, while slower cooling raises modulus and shrinkage. Differential shrinkage across thick-to-thin transitions can cause warpage. Published shrinkage data for this specific grey compound are limited; default linear low density polyethylene rotational moulding shrinkage values are generally in the range 1.5% to 3.0% depending on mould geometry and cooling rate.
The practical processing window for a linear low density polyethylene rotational moulding powder is narrower than for low density polyethylene. Where low density polyethylene may tolerate a peak internal air temperature range of 20°C to 30°C before severe degradation, linear low density polyethylene grades may require tighter control to avoid under-sintering or oxidative ageing. Plant trials with multiple thermocouples and cross-sectional microscopy are used to map internal bubble density against peak internal air temperature. A robust process for the grade is one that reproducibly falls within the central 5°C to 10°C band of the defined sintering plateau. In multi-cavity trials, a double-wall part with an insulating air gap can lag the oven air temperature and produce under-sintering on thick ribs even when thin walls are fully fused; published data for this specific configuration are limited.
The Listed LLDPE Grade Is Not a Direct Drop-In Substitute for LDPE Powders
Substitution of low density polyethylene with linear low density polyethylene in rotational moulding requires cycle revalidation. Low density polyethylene has a more branched molecular architecture, a lower melting temperature, and a lower viscosity at low shear, allowing lower oven set points and shorter dwell times. Linear low density polyethylene provides higher tensile strength and puncture resistance at equivalent density, but demands more thermal input. High density polyethylene offers higher flexural modulus but can show lower environmental stress crack resistance under slow crack growth testing such as ISO 16770:2019. Linear low density polyethylene often provides improved environmental stress crack resistance relative to high density polyethylene at equivalent melt flow, but the final value is strongly affected by cooling rate, moulded-in stress, and grey pigment dispersion.
Metallocene-catalysed linear low density polyethylene grades can provide higher low-temperature impact and better dart impact resistance than conventional Ziegler-Natta linear low density polyethylene under ISO 6603-2:2023. Icorene 3560 CM GRY 7225 is identified as a linear low density polyethylene; without a specific metallocene designation in the manufacturer datasheet, it should not be treated as an mLLDPE or plastomer-modified compound. Ethylene-vinyl acetate copolymers improve low-temperature toughness and flexibility but reduce stiffness and heat deflection temperature. The choice between ethylene-vinyl acetate, plastomer-modified linear low density polyethylene, and standard linear low density polyethylene depends on service temperature, mechanical load, and chemical contact. The grade is not a blend with ethylene-vinyl acetate unless stated by the supplier.
Compliance documentation for the compound must be obtained from the supplier for the specific lot and delivery form. The base olefin polymer may be evaluated under FDA 21 CFR 177.1520(c) for food-contact use, provided the pigment and stabiliser package comply with the stated limitations. European food-contact assessments follow EU 10/2011; overall migration is typically limited to 10 mg/dm² for film-like articles and 60 mg/kg for containers with volume below 500 mL, but the specific migration limits for pigments and processing aids must be verified. Electrical and electronic equipment applications require documentation against 2011/65/EU recast RoHS for restricted heavy metals and REACH candidate list substances. The grey pigment package may contain inorganic components that require raw material declarations.
| Item | Method or regulation | Documentation |
|---|---|---|
| Density | ISO 1183-1:2019 | Certificate of analysis |
| Melt mass-flow rate | ISO 1133-1:2022 at 190°C/2.16 kg | Certificate of analysis |
| Tensile properties | ISO 527-2:2012 | Lot release test report |
| Charpy notched impact | ISO 179-1:2020 | Lot release test report |
| Weathering resistance | ISO 4892-2:2021 Method A or ASTM G155-21 Cycle 1 | Accelerated ageing report |
| Food-contact status | FDA 21 CFR 177.1520(c), EU 10/2011 | Supplier compliance letter |
| RoHS and REACH | 2011/65/EU, 1907/2006/EC | Material declaration |
Because no universal certificate covers all colorants and lot variations, compliance statements must be reconfirmed before moving the product into regulated applications. Published grade-specific extraction data for this grey configuration are limited. The oxidative induction time at 200°C under ISO 11357-6:2018 is used to assess thermal stabiliser depletion during moulding. A comparative oxidative induction time test of virgin powder and moulded part can identify excessive thermal history. A significant oxidative induction time reduction suggests the heating cycle has consumed antioxidant; impact properties may decline over long-term service. Critical applications should define minimum retained oxidative induction time and maximum colour shift after moulding.
Gray 7225 Pigmentation, Carbon Dispersion, and Outdoor Weathering Resistance
Grey pigmentation can improve resistance to ultraviolet degradation compared with natural translucent polyethylene by screening ultraviolet light and reducing sub-surface photo-oxidation. However, weathering performance cannot be inferred from colour alone. Accelerated exposure under ISO 4892-2:2021 Method A using xenon-arc irradiance with daylight filters or ASTM G155-21 Cycle 1 provides comparative data on tensile elongation retention, colour shift, and gloss loss. As-moulded surfaces should be tested because sanding or polishing removes the oxidised skin and pigment-rich surface layer. Tensile property retention is measured under ISO 527-2:2012; colour difference is measured under ASTM D2244-23; gloss retention is measured under ISO 2813:2014 at a 60° geometry. Published weathering data for Icorene 3560 CM GRY 7225 are limited; the grade should not be assigned an outdoor service life without supplier-supported ageing data.
Pigment dispersion affects mechanical and weathering behaviour. Agglomerated pigment particles can act as stress concentrators and produce surface chalking after weathering. Lot-to-lot colour variation should be controlled with a retained standard; a CIELAB ΔE* value above 0.5 may be visible in side-by-side assembled components when critical colour matching is required. In rotational moulding, uneven pigment dispersion may appear as flow lines or specking. Microtome cross sections evaluated by optical microscopy at 100x magnification can identify pigment agglomerates; however, acceptance criteria are part-specific and should be established with the manufacturer.
Ultraviolet stabiliser packages for polyolefin rotomoulding compounds typically include hindered amine light stabilisers, which scavenge free radicals, and may include ultraviolet absorbers. In grey compounds, pigment screening can delay surface oxidation, but stabiliser depletion still occurs during thermal processing and service. For parts exposed continuously to sunlight, retained tensile elongation after accelerated ageing is more informative than visual inspection alone. Because the exact stabiliser package for Icorene 3560 CM GRY 7225 is not uniformly disclosed across distributor documents, outdoor qualification should reference the supplier lot-specific formulation and the specified weathering method rather than generic linear low density polyethylene performance.
