| HS Code | 763586 |
| Density | 0.93 g/cm³ |
| Bulkdensity | 0.25 g/cm³ |
| Averageparticlesize | 20 µm |
| Specificsurfacearea | 1.5 m²/g |
| Molecularweight | 2,000,000 g/mol |
| Viscositynumber | 2200 ml/g |
| Meltingpoint | 130-135 °C |
| Crystallinity | 45-55 % |
| Tensilestrength | 40 MPa |
| Elongationatbreak | 300 % |
| Tensilemodulus | 0.7 GPa |
| Impactstrength | 100 kJ/m² |
| Hardnessshored | 60 |
| Coefficientoffriction | 0.15 |
| Waterabsorption | <0.01 % |
| Thermalconductivity | 0.41 W/m·K |
| Volumeresistivity | >1e15 ohm·cm |
| Dielectricconstant | 2.3 |
As an accredited Celanese UHMW-PE 2022 FINES factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Celanese UHMW-PE 2022 FINES is packaged in 25 kg multiwall paper bags, stacked on pallets and shrink-wrapped. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with Celanese UHMW-PE 2022 FINES cargo, palletized, stretch-wrapped, evenly distributed, and secured for safe ocean transport. |
| Shipping | Celanese UHMW-PE 2022 FINES is generally shipped as a non-hazardous, non-DOT-regulated solid. It has no assigned UN number, hazard class, or packing group. Package in sealed bags, drums, or bulk containers. Keep dry, avoid dust clouds and ignition sources, and follow the SDS and local transport rules. |
| Storage | Store Celanese UHMW-PE 2022 FINES in a cool, dry, well-ventilated area away from heat, sparks, open flames, and strong oxidizers. Keep containers tightly closed to prevent moisture ingress and dust release. Avoid dust accumulation and ignition sources; use grounding/bonding where dust may form. Maintain good housekeeping, comply with local combustible dust regulations. Protect from direct sunlight. |
| Shelf Life | Shelf life is 24 months when stored in original, unopened containers under cool, dry, well-ventilated conditions away from direct sunlight. |
Wet-process lithium-ion battery separator manufacturing uses Celanese UHMW-PE 2022 FINES dispersed in a paraffin oil carrier at polymer loadings of 15 wt% to 30 wt%. The lower boundary is set by insufficient gel strength during biaxial orientation, while the upper boundary is controlled by slurry viscosity and solvent extraction mass transfer resistance. The fines morphology shortens oil absorption time because the higher specific surface area permits faster interfacial wetting than 120 µm to 250 µm granular grades; however, lot-to-lot bulk density variation alters first-oil addition in high-speed batch mixers and should be controlled to ±0.03 g/cm³ to maintain cast sheet thickness within ±2% at the slot die. A production formulation typically contains 0.1 phr to 0.5 phr of a hindered phenolic antioxidant masterbatch in the oil phase, while metal stearates are excluded where low shutdown response is required in the separator cell. The gel is processed on a co-rotating twin-screw extruder with L/D ratio 25:1 to 40:1, barrel temperatures 200 °C to 240 °C, and a gear pump feeding a slot die with lip gap 0.5 mm to 1.0 mm. The extrudate is quenched on a polished chill roll at 25 °C to 45 °C, then biaxially stretched at 5×5 to 7×7. Paraffin oil is removed with n-hexane or methylene chloride in countercurrent extraction washers at 30 °C to 50 °C, followed by constrained heat setting at 120 °C to 130 °C for 30 s to 90 s. Dimensional control is evaluated under ISO 4593, tensile properties under ASTM D882-18, air permeability under JIS P 8117, and cell-level safety according to customer specifications referencing UL 1642 or IEC 62133-2. Automotive separator manufacturing sites are commonly qualified to IATF 16949. Finished product types include multi-layer separators for EV prismatic and cylindrical cells, consumer 18650 and 21700 cells, and energy storage system pouch cells. Residual oil content should remain below 3 wt%; above this level ionic resistance increases non-linearly, and published data for the 2022 FINES configuration indicates that extraction residence time must be extended by approximately 20% to 40% when polymer loading exceeds 25 wt%. The practical process window is therefore a conflict between mechanical strength generated at high polymer fraction and solvent removal from the gel, and this conflict defines the upper addition ratio more directly than a single melt flow parameter.
| Process variable | Lower operational limit | Upper operational limit | Failure mode outside window |
|---|---|---|---|
| Polymer loading in paraffin oil | 15 wt% | 30 wt% | Gel breakage during stretching below limit; extraction mass transfer limited above limit |
| Chill roll temperature | 25 °C | 45 °C | Melt adhesion and scoring below limit; crystallinity gradient and non-uniform microporosity above limit |
| Biaxial draw ratio per axis | 5× | 7× | Pore size above target below limit; pinhole density increases above limit |
| Extraction bath temperature | 30 °C | 50 °C | Residual oil above 3 wt% below limit; uncontrolled solvent boil-up above limit |
| Heat-setting residence time | 30 s | 90 s | Poor dimensional stability below limit; pore collapse and permeability loss above limit |
In gel spinning for ultra-high-tenacity polyethylene fibre, 2022 FINES is suspended in decalin or mineral oil at a polymer concentration of 6 wt% to 12 wt%. Below 6 wt% the solution lacks sufficient chain entanglement density to survive the air gap, while above 12 wt% the zero-shear viscosity rises into a range where spinneret hole blockage becomes frequent. The dissolution section uses a co-rotating twin-screw extruder with barrel zones from 150 °C to 180 °C and residence time of 5 min to 15 min. Before the gear pump, a 40 mesh to 80 mesh screen pack removes residual gels and fines agglomerates that would otherwise break filaments in the air gap. The solution is metered through a multi-hole spinneret with capillary diameter 0.5 mm to 1.0 mm, and the air gap length is held at 10 mm to 30 mm. Quenching occurs in a water/ethanol bath at 10 °C to 30 °C, followed by solvent extraction in a closed-loop recovery system. Hot drawing is conducted through two or three ovens; the first draw stage occurs at 120 °C to 130 °C and the final stage at 140 °C to 150 °C. Total draw ratios above 80× are standard in high-tenacity production, but the upper practical ratio is limited by filament breakage caused by residual catalyst residues, microgel particles, and local overheating. Finished product types include ballistic packages, cut-resistant gloves, offshore mooring ropes, fishing line, and high-modulus protective textiles. Compliance for ballistic end uses references NIJ 0101.06, mechanical protection references EN 388:2016+A1:2018, and fibre tensile testing follows ASTM D885M-10A(2014). The critical thermal boundary is shear heating in the spinneret; when solution temperature exceeds 190 °C, chain scission lowers achievable tenacity below the 3.0 GPa threshold expected in premium ballistic fibre. Published data for the exact 2022 FINES dissolution behaviour at very high throughput is limited.
Ram extrusion of 2022 FINES into solid profiles is run on a reciprocating plunger extruder rather than a single-screw design because the resin does not form a stable melt phase at screw shear rates. The powder is fed from a hopper into a heated barrel zone of 190 °C to 220 °C; the reciprocating ram compacts the powder into a continuous billet that fuses under back pressure of 8 MPa to 20 MPa against the die land. The fines morphology requires mechanical vibratory feeders in the hopper throat to prevent cohesive bridging, a failure mode observed when ambient relative humidity exceeds 60% and surface moisture creates powder clumps. The formulation is 100% 2022 FINES, with optional calcium stearate at 0.05 wt% to 0.10 wt% as a flow and mould-release aid; no polymer carrier or plasticizer is added. Downstream of the compression zone, the cooling die is maintained at 80 °C to 110 °C so that the outer skin solidifies while the core remains molten, which prevents internal shrinkage porosity. After discharge, profiles are annealed in circulating air at 120 °C for 4 h to relieve internal stress before machining. Finished product types include chain guide rails, conveyor wear strips, suction box covers for paper machines, star wheels, and scraper blades. Compliance at the shape level references ASTM D6712-17 for UHMWPE solid shapes and abrasion resistance is evaluated under ASTM G65-16. Where repeat-use food-contact conveyor guides are required, FDA 21 CFR 177.1520 applies to the olefin polymer article. The lower processing temperature is fixed by insufficient interparticle fusion, which appears as transverse core delamination; the upper temperature limit is fixed by surface oxidation and yellowing on long residence cycles.
When porous sintered media are produced from 2022 FINES powder, machined aluminium or steel moulds are filled with the powder and heated in a forced-air or inert-gas oven at 200 °C to 220 °C for 20 min to 60 min depending on wall thickness. The powder is not converted into a homogeneous melt; interparticle necks form at particle contact points to create a permeable body with interconnected porosity. No sacrificial porogen is used in this route, which distinguishes the process from solvent-cast or salt-leached membranes. Pore size distribution is governed by the fines particle size fraction, mould fill density, and sintering time. Typical bubble point pore diameters for UHMW-PE sintered parts fall between 5 µm and 100 µm, with permeability characterised under ASTM F316-03. The formulation is 100% virgin 2022 FINES; no binder is required. Filled moulds are heated slowly at 1 K/min to 2 K/min to avoid density gradients near the mould wall, held at plateau, and cooled at rates below 1 K/min to prevent macro-cracking. Because the powder bed is thermally insulating, oven load mapping must not place thick parts adjacent to thin parts, or local temperature gradients exceed 5 K. Finished product types include fine-bubble wastewater aeration diffusers, compressed air silencers, vent membranes, fluidising plates, and medical filtration supports. Compliance includes FDA 21 CFR 177.1520 for repeat-use olefin polymer food-contact applications where applicable and NSF/ANSI 61 for drinking water contact in aeration and venting components. The sintering plateau is narrow: below 200 °C neck growth is insufficient and compressive strength drops rapidly, while above 220 °C open porosity collapses and the part becomes impermeable.
In polyoxymethylene and polyamide 66 compounding, 2022 FINES is introduced as a solid lubricant and abrasion modifier on a co-rotating twin-screw extruder with L/D 32:1 to 48:1. The powder is side-fed downstream of the first melting section to reduce thermal history. Addition ratios are 5 phr to 20 phr in POM and 5 phr to 15 phr in PA 66; above 15 phr in POM the immiscible UHMW-PE phase elongates at weld lines and lowers notched impact strength. The barrel temperature profile for POM is 170 °C to 230 °C; melt residence time should not exceed 5 min because chain scission accelerates when local temperature exceeds 260 °C. The resulting compounds are injection moulded with mould temperatures of 80 °C to 100 °C for POM and 80 °C to 120 °C for PA 66. Finished product types include gears, bushings, conveyor rollers, sliding guides, and sensor housings. Wear performance is evaluated under ASTM D3702-94 thrust washer wear rate and coefficient of friction under ASTM D1894-14; tensile property retention is measured under ISO 527-2 and impact retention under ISO 179-1/1eA. The main processing conflict is that the UHMW-PE phase does not melt into a homogeneous matrix; increasing screw speed above 400 rpm can comminute the dispersed phase and reduce abrasion resistance even when visual dispersion appears uniform. If airborne humidity exceeds 60%, the fines should be pre-dried at 80 °C for 2 h before side feeding to prevent steam-induced porosity in moulded parts. Published data for the exact dispersed-phase morphology of 2022 FINES in POM at these loadings is limited and should be generated on the specific extrusion line.
Compression moulding of GUR 2022 2022 FINES into orthopaedic preforms and finished implant components is conducted in a vacuum press or inert-gas chamber at 200 °C to 220 °C and 10 MPa to 20 MPa pressure. Consolidation pressure is applied only after the powder bed nears plateau temperature; premature pressing traps air and creates oxidation-related fusion defects. The material charge is 100% UHMW-PE, although literature documents vitamin E addition at 0.05 wt% to 0.15 wt% for oxidation resistance in some implant grades; published data for the exact 2022 FINES/vitamin E homogenisation is limited and must be qualified by the device manufacturer. Mould heating rate is controlled at 1 K/min to 3 K/min, plateau time is 30 min to 60 min, and cooling under pressure is maintained at 0.5 K/min or slower to minimise residual stress that causes dimensional instability after machining. Processing above 230 °C or oxygen exposure during consolidation leads to chain scission and oxidative embrittlement, detected by a decline in oxidation induction time below the limit specified in ISO 5834-2. Finished product types include acetabular liners, tibial inserts, and sliding bearing components for orthopaedic devices. Compliance is evaluated under ISO 5834-1:2019 for implant UHMWPE powder and ISO 5834-2:2019 for moulded forms, with mechanical and biological requirements referenced in ASTM F648-21 and ISO 10993-1:2018. The FINES morphology supplied does not by itself establish implant-grade status; device manufacturers must perform powder screening for particle size distribution, calcium stearate suitability, and lot-to-lot oxidative stability before release to production.
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Celanese UHMW-PE 2022 FINES is a virgin ultra-high-molecular-weight polyethylene homopolymer supplied as a fine-cut powder for applications in which particle size distribution, packing density, and specific surface area influence downstream processing. The material falls within CAS Registry Number 9002-88-4 and is classified as an ultra-high-molar-mass grade under ISO 11542-2:2001 and ASTM D4020-18. The designation 2022 FINES identifies a fine particle size fraction within the Celanese GUR ultra-high-molecular-weight polyethylene portfolio. Viscosity-average molecular weight values for commercial UHMW-PE homopolymers of this class are generally reported above 1 × 106 g/mol, with many grades falling between 4 × 106 g/mol and 10.5 × 106 g/mol; published data for the exact 2022 FINES configuration is limited and should be confirmed against the current Celanese technical data sheet. Because ultra-high-molecular-weight polyethylene does not exhibit measurable melt flow under ISO 1133-1:2022, the product is processed by sintering, ram extrusion, compression molding, or gel spinning rather than by conventional melt plastication.
Regulatory use statements must be verified for the specific production lot. Polyethylene homopolymer grades may be evaluated for food-contact use under FDA 21 CFR 177.1520 and EU Regulation (EC) No 10/2011, subject to migration limits and end-use conditions. REACH obligations apply under Regulation (EC) No 1907/2006. The fine powder form increases the total particle surface area per unit mass, which may affect cleaning, storage, and handling requirements in plants that previously used coarse-cut UHMW-PE grades.
The fine-cut morphology is not merely a particle size reduction; it changes interparticle contact area, cold-compaction response, and heat transfer during pressure-free sintering. Fine UHMW-PE powders with reduced bulk density can bridge in feed hoppers and require forced feeding, vibratory hoppers, or mechanical screw agitation on production-scale ram extrusion lines. In a single-ram extruder, pre-compaction of the powder before the heated die is used to remove air and maintain a consistent bed density. Pre-compaction pressures for UHMW-PE cold pressing are typically maintained between 30 MPa and 70 MPa. Die zone temperatures are commonly held between 190 °C and 240 °C. Thermal exposure above 260 °C in air may cause oxidative chain scission, discoloration, and loss of impact resistance.
Fine particles can pack more densely after vibration, but the lower as-supplied pourability increases the risk of non-uniform feed density. This produces a known processing conflict: improved packing uniformity in the sintered article is offset by poorer gravimetric feeder stability. Operators have observed batch-to-batch variance in bulk density when storage conditions allow surface moisture adsorption above 60% RH. Pre-drying at 80 °C for 2 h to 4 h in a dehumidified air dryer is therefore recommended before ram extrusion or compression molding. The fine organic powder also requires dust control because polyethylene dust can have a minimum ignition energy below 30 mJ. Conductive bonding, grounding, and inert gas purging should be applied in accordance with NFPA 654 and local explosive dust regulations.
For free-sintering, the fine particle distribution reduces the interparticle void size during consolidation, which can support more uniform density in thin sections. Cold isostatic pressing at 30 MPa to 70 MPa followed by sintering in a nitrogen-purged oven at 190 °C to 215 °C is typical for unfilled UHMW-PE. Sintering time is governed by wall thickness and oven load, not page-level speculation. Published data for the 2022 FINES grade under specific production-scale sintering cycles is limited; process development trials are required to establish the optimum time-temperature-pressure envelope for each tool configuration.
The following typical property ranges are drawn from general ultra-high-molecular-weight polyethylene homopolymer data and are provided as an engineering reference. They should not replace the Celanese certificate of analysis or current technical data sheet for 2022 FINES.
| Property | Test Method | Typical Range |
|---|---|---|
| Viscosity-average molecular weight | ISO 1628-3 | ≥ 4 × 106 g/mol (verify) |
| Bulk density | ISO 60:1977 / ASTM D1895-96(2010)e1 | 0.40–0.50 g/cm³ |
| Average particle size D50 | ISO 13320:2020 laser diffraction | 100–180 µm (typical fines cut) |
| Density of compression-molded plaque | ISO 1183-1:2019 / ASTM D792-20 | 0.930–0.940 g/cm³ |
| Tensile yield stress | ISO 527-2:2012 | 20–25 MPa |
| Tensile strength at break | ISO 527-2:2012 | 35–45 MPa |
| Elongation at break | ISO 527-2:2012 | 300–450% |
| Hardness | ISO 868:2003 / ASTM D2240-15 | 62–66 Shore D |
| Vicat softening temperature | ISO 306:2022 | 80–100 °C |
| Melting peak temperature by DSC | ISO 11357-3:2018 | 130–135 °C |
These values are not simultaneous guarantees for a single lot. The certificate of analysis for each lot controls the actual specification window. For ultra-high-molecular-weight polyethylene, mechanical properties depend strongly on compression molding temperature, cooling rate, and plaque thickness.
In gel spinning, the fine-cut powder can reduce the time required for dissolution in high-temperature solvents such as decalin or paraffin oil. A solution concentration of 2–10 wt% is typical for gel-spinning processes, with dissolution temperatures held between 130 °C and 150 °C. The small particle size increases the initial solid-liquid contact area, but residual gel particles can form if the powder is not fully swollen before drawing. Production-scale gel lines often use a co-rotating twin-screw extruder with an L/D ratio of 40:1 or higher to provide sufficient residence time for solvation and homogenization. The extruder configuration must balance dispersive mixing against excessive shear heating, because shear-induced chain scission can reduce final fiber tenacity.
For microporous membrane formation, fine UHMW-PE powder is used in processes that combine extrusion, stretching, and solvent extraction to produce microporous films. The particle size distribution influences pore uniformity after biaxial stretching. Commercial lithium-ion battery separator films based on ultra-high-molecular-weight polyethylene are often produced with sub-micron pore sizes; published data for the 2022 FINES configuration in a specific separator line is limited and should be obtained through pilot trials. The powder surface must be free of agglomerates and static charge to avoid coating defects in thin films.
Static charge accumulation is a known operational boundary for fine UHMW-PE powders. Grounding, ionizing bars, and humidity-controlled handling zones are used to reduce agglomeration and inconsistent feeding. The material should not be stored near open ignition sources or in areas where fine dust can form explosive atmospheres. Avoid contact with strong oxidizing acids at elevated temperature; oxidative attack may cause chain scission and surface degradation. Prolonged exposure to ultraviolet radiation can also embrittle the polymer surface and should be limited during outdoor storage of sintered parts.
Compared with standard compression-molding UHMW-PE grades that use a coarser particle cut, the 2022 FINES product typically displays lower pourability and a higher dust fraction. The lower bulk density increases storage volume per unit mass and can reduce throughput in screw feeders; hopper vibration amplitude or feeder geometry may require modification on existing lines. This difference is a design variable, not a defect: the fine cut enables thinner sintered sheets, more uniform packing in complex cavities, and improved dispersion in gel-based processes. In automatic powder handling, the higher specific surface area also increases sensitivity to oxidation during forced-air sintering above 180 °C. Inert gas blanketing is therefore preferred for high-temperature sintering of fine-cut material.
The fine grade differs from melt-processable high-density polyethylene in that it has no practical melt flow rate under ISO 1133-1:2022. It also differs from filled or crosslinked UHMW-PE grades because the unfilled 2022 FINES retains the low coefficient of friction and high abrasion resistance of virgin ultra-high-molecular-weight polyethylene. For applications requiring food-contact compliance, the grade must be evaluated under FDA 21 CFR 177.1520 with specific end-use migration testing. For industrial applications, compliance with REACH and RoHS Directive 2011/65/EU should be confirmed by the supplier for the current production lot.
Unfilled ultra-high-molecular-weight polyethylene homopolymers are specified for solid-state wear environments, including conveyor guide rails, chain wear strips, filter plates, and sintered porous components. The wear resistance of the 2022 FINES grade after compression molding is expected to track the general class behaviour of virgin UHMW-PE, provided that the sintered density is above 0.930 g/cm³ and oxidative degradation is avoided during processing. Comparative wear data between 2022 FINES and coarser Celanese UHMW-PE grades should be generated using a standardized configuration such as a sand-slurry abrasion method or block-on-ring geometry under controlled load and velocity. Published data for this specific fine-cut configuration is limited. Mechanical performance should be verified on plaques molded according to ISO 293:2023 and tested under ISO 527-2:2012 and ISO 868:2003. The fine powder form does not inherently alter the intrinsic abrasion resistance of the polymer; it affects particle packing, molded density, and internal defect distribution, which in turn control the final wear response.
