Celanese UHMW-PE 5129
- Product Name: Celanese UHMW-PE 5129
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Celanese UHMW-PE 5129 is typically used in formulations when molecular weight and processing temperature must be controlled within specific ranges.
| HS Code | 874258 |
| Density | 0.93 g/cm³ |
| Bulk Density | 0.45 g/cm³ |
| Molecular Weight | 5.0 × 10⁶ g/mol |
| Average Particle Size | 150 µm |
| Melting Point | 135 °C |
| Crystallinity | 45% |
| Tensile Modulus | 700 MPa |
| Tensile Strength At Yield | 20 MPa |
| Elongation At Break | 300% |
| Charpy Notched Impact Strength | No break |
| Abrasion Resistance | 100 mm³ |
| Coefficient Of Friction | 0.15 |
| Water Absorption | <0.01% |
| Thermal Conductivity | 0.41 W/m·K |
| Coefficient Of Linear Thermal Expansion | 1.5 × 10⁻⁴ /K |
| Dielectric Constant | 2.3 |
| Volume Resistivity | >10¹⁵ Ω·cm |
| Maximum Service Temperature | 80 °C |
As an accredited Celanese UHMW-PE 5129 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Celanese UHMW-PE 5129 is typically packaged in 25 kg moisture-barrier paper bags, palletized for industrial transport and storage. |
| Container Loading (20′ FCL) | Non-hazardous Celanese UHMW-PE 5129 loaded in a 20′ FCL for ocean freight: palletized bags, dry container, secured, weight-compliant. |
| Shipping | Celanese UHMW-PE 5129 is transported as a non-hazardous, non-DG polymer. It is usually packaged in moisture-resistant bags or sacks on pallets. No UN number, hazard class, packing group, or transport label is required. Keep dry; avoid heat, sunlight, and contamination. Follow the supplier’s SDS and local regulations. |
| Storage | Store Celanese UHMW-PE 5129 in a cool, dry, well-ventilated area away from direct sunlight, heat, ignition sources, and strong oxidizers. Keep original containers tightly closed to prevent moisture and contamination. Avoid dust generation or accumulation; use appropriate grounding and housekeeping. Protect from ultraviolet light and physical damage. Follow local regulations and the manufacturer’s safety data sheet recommendations. |
| Shelf Life | Celanese UHMW-PE 5129 typically has a 2-year shelf life when stored cool, dry, and sealed in original packaging. |
Continuous solid profiles from Celanese UHMW-PE 5129 on conventional single-screw extrusion lines are technically unattainable because the grade does not produce a measurable melt flow rate under ISO 1133-1:2022 and displays a viscosity number above 2,000 mL/g when tested in decalin according to ISO 1628-3. The only stable profile route is solid-state ram extrusion, where the powder is loaded into a reciprocating ram extruder, compacted in the feed zone at 10–15 MPa, transferred into a heated die block held at 200–230°C, and consolidated by plug-flow sintering through a die land length of 60–100 mm. On a production line using a 200-tonne hydraulic ram extruder with a 1,200 mm heated die body and a water-jacketed cooling sleeve with inlet water at 15–25°C, profile ovality is maintained below 1.5 % of nominal diameter. The compounding recipe for wear strips is deliberately additive-lean: 99.6–99.8 wt% virgin UHMW-PE 5129 powder, 0.15–0.30 wt% calcium stearate as internal lubricant, and 0.05–0.10 wt% hindered phenolic stabilizer. Inorganic fillers and glass fibres are excluded because they increase the dry sand rubber wheel abrasion volume loss under ASTM G65 Procedure A and generate interfacial porosity at sintering temperature. Downstream components produced from these profiles include chain guide rails for high-speed bottling lines, curved wear strips on PET bottle conveyors, star wheels for filling stations, scraper blades for belt cleaners, and guide blocks for packaging machinery. Regulatory compliance for food-contact conveyor parts rests on 21 CFR 177.1520(c) with extractable limits in §177.1520(d), EU Regulation 10/2011 Annex II specific migration limits for heavy metals, and ISO 11542-1:2001 designation. The main operating boundary is the sintering temperature: below 200°C the core remains under-sintered and tensile elongation drops, while above 230°C oxidative chain scission at the surface yields a yellowing skin and reduced impact strength.
What Controls Sintering Uniformity in Compression-Molded Sheet Stock?
Compression molding of UHMW-PE 5129 into thick-section wear liners is governed by conductive heat transfer through the powder bed rather than by melt flow. A 30 mm sheet in a 1,500 mm × 3,000 mm daylight press is molded at 20–25 MPa platen pressure and 210–230°C platen temperature. The isothermal hold is calculated at 5–7 min per 10 mm of thickness after the core thermocouple reaches 200°C. Formulation for mining chute liners uses 100 parts by weight virgin UHMW-PE 5129 powder; where outdoor UV exposure is specified, 0.3–0.8 wt% carbon black masterbatch or 0.2–0.5 wt% hindered amine light stabilizer masterbatch is added. The cooling segment is equally critical: the press remains under load while the platens cool at 10–15 K/h between 180°C and 120°C to prevent warpage and residual stress. Typical finished products include coal chute liners, truck bed liner panels, hopper discharge wear pads, silo bin liners, and vessel internal wear strips. Compliance for industrial sheet stock is anchored to ASTM D4020-18 for material classification, ISO 11542-1:2001 for the PE-UHMW designation block, and, where specified by mining operators, MSHA 30 CFR Part 7 flame-resistance criteria. A known operational limitation is that panels above 80 mm thickness can exhibit a measurable core-to-surface tensile yield stress differential under ASTM D638-14; published data for this specific configuration is limited, so converter qualification trials measure density gradient across the thickness.
| Standard / regulation | Scope | Acceptance data checked for 5129 sheet |
| ASTM D4020-18 | Classification of UHMWPE molding and extrusion materials | Viscosity number ≥ 2,000 mL/g; ash ≤ 0.15 % |
| ISO 11542-1:2001 | Designation system for PE-UHMW | Designated data-block code according to viscosity number, elongation stress, stabilizer class |
| 21 CFR 177.1520(c) | Olefin polymer food-contact clearance | Extractable fraction and maximum extractive limits in §177.1520(d) |
| ASTM G65 Procedure A | Dry sand rubber wheel abrasion | Volume loss comparison against control sheet |
A wet-process lithium-ion battery separator line converts UHMW-PE 5129 into microporous film by blending the resin with paraffinic process oil, extruding a gel precursor, biaxially stretching the precursor, and extracting the oil to create interconnected pores. The gel precursor formulation is generally 15–25 wt% UHMW-PE 5129 in 75–85 wt% paraffin oil, with fumed silica added at 0–10 phr when a higher shutdown temperature is required; the resin lot must have ash content below 150 ppm, a narrow particle size distribution, and consistent gel count to prevent pinhole defects. A co-rotating twin-screw extruder with an L/D ratio of 40–60 and a gear-pump die assembly casts a 0.8–2.5 mm precursor film at stock temperatures near 200°C. The film is then stretched 5–8 times in machine direction and 5–10 times in transverse direction at 110–130°C, followed by solvent extraction in a chlorinated or hydrocarbon bath and heat-setting at 120–135°C under tension. The resulting monolayer separator typically shows porosity in the 35–45 % range and Gurley permeability of 200–450 s/100 mL before ceramic coating. End articles include monolayer and ceramic-coated separator films for lithium-ion pouch, cylindrical, and prismatic cells. Compliance is governed by IEC 62660-2 for cell reliability, UN 38.3 transport safety, REACH Annex XVII, and IATF 16949 for automotive battery supply chain quality. Published data for this specific UHMW-PE 5129 configuration is limited, so separator producers qualify needle penetration strength, shrinkage at 105°C for 1 hour, and shutdown temperature internally.
Gel-Spun Fiber Drawing Line Constraints and High-Tenacity Rope Applications
In gel spinning, UHMW-PE 5129 is dissolved in a high-boiling solvent, extruded as a gel filament, quenched, and then hot-drawn to align the chains into high-tenacity fibre. The dope formulation is prepared at 5–10 wt% polymer in decalin or paraffin oil, with 0.01–0.05 wt% antioxidant on polymer to limit thermo-oxidative degradation during dissolution. A co-rotating twin-screw dissolver feeding a metering spin pump and spinneret assembly extrudes filaments into a water/ethanol coagulation bath maintained at 5–20°C, after which the solvent is removed in a counter-current extraction line and the gel yarn is drawn in forced-air ovens at 120–150°C with a total draw ratio between 30:1 and 60:1. The line is operated under tension-controlled winders rather than speed-controlled winders to prevent denier drift and broken filaments at the draw godets. End products include synthetic ropes and slings for marine mooring, offshore lifting, cut-resistant gloves, fishing lines, and ballistic protective composites. Compliance for marine ropes is assessed under ISO 10325, cut resistance under EN 388:2016+A1:2018, and general chemical safety under REACH. The operational boundary is the gel dissolution temperature: above 180°C in decalin, molecular weight loss accelerates and fiber tensile strength falls below the design minimum.
When Filter Press Plate Faces Encounter Hot Caustic Slurry
Compression-molded UHMW-PE 5129 is machined into recessed chamber plates for filter presses because it resists abrasion and chemical attack in mineral dewatering and caustic filtration. The plate blanks are produced as thick sheet from 100 wt% virgin UHMW-PE 5129 powder without plasticiser or filler, molded at 20–25 MPa and 210–230°C, then CNC-machined to chamber depths from 15 mm to 40 mm and surface roughness at the sealing face below 3.2 µm Ra. The process consolidates the centre section of the plate, while the machined filtrate ports and corner bosses are fabricated after annealing at 100°C for 4 hours to reduce machining-induced stress. In 40 % NaOH slurry at 60°C, the material remains dimensionally stable; continuous exposure above 80°C in strong caustic or oxidising slurries can accelerate environmental stress cracking at machined corners. End products include recessed chamber plates, membrane backing plates, sludge dewatering plates, and filter press frame inserts. Compliance for chemical service is documented under REACH Annex XVII, RoHS Directive 2011/65/EU, and, for food-contact dewatering, EU Regulation 1935/2004 with overall migration verification under EU 10/2011. Published data for this specific UHMW-PE 5129 configuration is limited; plate manufacturers therefore run a 1,500-hour slurry immersion test against a reference plate.
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- Celanese UHMW-PE 5129 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.
Celanese UHMW-PE 5129 is an unfilled ultra-high-molecular-weight polyethylene grade supplied as a free-flowing powder for ram extrusion and compression molding. The product is also listed as GUR 5129 in manufacturer documentation. The numerical designation 5129 identifies a specific molecular-weight class within the Celanese GUR UHMW-PE portfolio. For specification purposes, the material may be classified under ISO 21304-1 and ASTM D4020; the complete designation line requires lot-specific values from the certificate of analysis.
The term ultra-high-molecular-weight polyethylene is defined in ISO 11542-1 as polyethylene with a viscosity-average molecular weight of at least 1.5×10⁶ g/mol. Celanese UHMW-PE 5129 sits well above that threshold. The viscosity-average molecular weight is in the 9×10⁶ g/mol class when measured by solution viscosity in decalin at 135 °C according to ISO 1628-3:2010. The material does not produce a measurable melt flow rate under ISO 1133-1:2022 at 190 °C/21.6 kg. This absence of measurable melt flow excludes conventional injection molding and screw extrusion as conversion routes and defines the downstream equipment envelope.
| Physical or mechanical property | Published value | Method |
|---|---|---|
| Density | 0.930 g/cm³ | ISO 1183-1:2019 |
| Bulk density | 0.45 g/cm³ | ISO 60:2023 |
| Viscosity-average molecular weight | 9×10⁶ g/mol class | ISO 1628-3:2010 |
| Tensile yield stress | 21 MPa | ISO 527-2:2012 |
| Tensile strain at break | >300% | ISO 527-2:2012 |
| Charpy impact | No break at 23 °C | ISO 179-1 / ISO 11542-2 |
| Shore D hardness | 61–64 | ISO 868:2003 |
| Vicat softening temperature | 80 °C | ISO 306/A50 |
Tensile and impact values are typical for compression-molded plaques conditioned at 23 °C and 50% relative humidity. They are engineering reference values rather than minimum specification limits. The coefficient of dynamic friction against polished steel in dry conditions is generally reported in the 0.10–0.20 range for UHMW-PE grades using ASTM D1894 or ISO 8295; grade-specific friction values should be confirmed for finished part counterfaces.
What separates this grade from lower-molecular-weight UHMW-PE and HDPE?
The first-order difference is rheological. Lower-molecular-weight UHMW-PE grades in the 4.5–5.9×10⁶ g/mol range can be compression-molded with shorter preheat times and lower compaction force. Celanese UHMW-PE 5129 requires longer thermal soak and higher force to eliminate powder-particle weld lines. The higher molecular weight increases chain-entanglement density, which improves sand-slurry abrasion resistance and impact toughness but reduces the practical output of ram extrusion lines. Comparative wear data for the exact effect on abrasion is application-specific because laboratory wear tests provide relative rankings rather than absolute service-life predictions.
HDPE homopolymer differs in the opposite direction. HDPE has a measurable melt flow rate of 0.3–10 g/10 min under ISO 1133-1:2022 and can be processed by injection molding, extrusion, and blow molding. Its tensile yield stress is typically 26–30 MPa by ISO 527-2:2012. Celanese UHMW-PE 5129 has a lower tensile yield stress, approximately 21 MPa, but substantially higher Charpy impact and abrasive wear resistance. The grade cannot be conveyed by conventional single-screw or twin-screw extruders because the high-viscosity melt does not form a pumpable melt phase. Twin-screw compounding with this material is not a standard manufacturing route.
| Parameter | Celanese UHMW-PE 5129 | Lower-molecular-weight UHMW-PE | HDPE homopolymer |
|---|---|---|---|
| Viscosity-average molecular weight | 9×10⁶ g/mol class | 4.5–5.9×10⁶ g/mol class | 1–2×10⁵ g/mol |
| Melt flow rate by ISO 1133-1:2022 | Not measurable | Not measurable | 0.3–10 g/10 min |
| Tensile yield stress by ISO 527-2:2012 | 21 MPa | 20–22 MPa | 26–30 MPa |
| Abrasive slurry wear ranking | Higher | Moderate | Lower |
| Primary conversion route | Ram extrusion, compression molding | Ram extrusion, compression molding | Injection molding, extrusion, blow molding |
Compared with modified UHMW-PE grades containing internal lubricants, silicone, or molybdenum disulfide, 5129 is an unfilled base polymer. This absence of additives simplifies food-contact and regulatory documentation but may require external lubrication in high-speed bearing contacts. Published friction and wear data for the specific grade in lubricated or filled configurations is limited.
Compression molding and ram extrusion processing envelope
Ram extrusion lines for this grade typically use piston-driven machines with barrel diameters between 30 mm and 200 mm. The powder is advanced by a reciprocating ram through a heated barrel and into a forming die. Barrel temperatures are generally set from 180 °C to 230 °C, and die temperatures from 190 °C to 220 °C. Hydraulic ram pressure is adjusted to die cross-section and land length. Long profiles can require piston pressures above 10 MPa on production-scale equipment. Industrial experience shows that insufficient barrel residence time creates powder-particle weld lines in thick sections, while excessive temperature produces yellowing and oxidative degradation. Dimensional control in ram-extruded profiles is maintained by water cooling below 45 °C and by controlling haul-off speed.
Compression molding of 5129 slabs normally uses a hot press set at 200 °C to 220 °C. Pressure is applied in the range of 10–15 MPa after the powder reaches molding temperature. Holding time is thickness-dependent and is often extended by 10–15 min/mm for large cross-sections. Thick slabs are then cooled under pressure to below 45 °C before ejection to reduce warpage. Because UHMW-PE powder has low thermal conductivity, heating rate from the press platens is the limiting variable. Optical microscopy of poorly fused sections can reveal retained powder grain boundaries, a common failure mode when cycle time is shortened below the thermal soak requirement.
Pre-drying is not generally required for UHMW-PE powder. However, condensation on cold powder stored at relative humidity above 60% can produce steam-induced surface defects. When warehouse conditions are uncontrolled, the powder should be conditioned in dry air at 23 °C before charging the press or ram extruder. The grade is hydrophobic and displays moisture absorption of approximately 0.01% by ISO 62:2008.
When abrasive slurry handling requires molecular weights above 8 million g/mol
Wear strips, chain guides, and conveyor components are specified when dry or slurry abrasion resistance must exceed HDPE and lower-molecular-weight UHMW-PE. The 9×10⁶ g/mol class is relevant where molecular weights above 8×10⁶ g/mol are required for impact and abrasion service. Published UHMW-PE wear literature indicates that sand-slurry abrasion resistance increases with molecular weight up to a plateau region. Exact service-life multipliers for 5129 compared with lower grades are system-dependent and are not fully described by a single laboratory test. ISO 15527-2 and ASTM G75-19 can provide comparative sand-slurry rankings, but published data for this specific configuration is limited.
Pump impellers, filter plates, mixer paddles, and silo liners are common conversion targets because the base polymer resists inorganic salt solutions, dilute acids, and alkalis. The material is not recommended for continuous service in strong oxidizing acids, aromatic hydrocarbons, or chlorinated solvents at elevated temperature, because swelling and environmental stress cracking may be initiated. In field service, premature failure of abrasive slurry pump impellers often occurs at machined keyways or sharp corners rather than in the bulk material. Design should therefore avoid sharp internal radii and should account for notch sensitivity in high-load regions.
Chain guides and wear strips in bottling, packaging, and food-processing conveyors use this grade where FDA 21 CFR 177.1520 olefin polymer clearance applies. Finished-part food-contact use requires end-use extraction testing because residual material levels vary with processing conditions. The operational boundary for continuous load-bearing applications is near 80 °C, based on the Vicat softening temperature by ISO 306/A50. Intermittent or localized exposure above this threshold requires derating, particularly when static load is applied.
Regulatory documentation for Celanese UHMW-PE 5129 typically includes FDA 21 CFR 177.1520 olefin polymer clearance and EU 10/2011 migration documentation when requested. REACH and RoHS compliance must be confirmed against the specific production lot and regional regulatory version. The grade is supplied as an unfilled polymer, so additive-related compliance variables are limited. The melting peak by ISO 11357-3 is near 135 °C, but thermo-oxidative degradation begins well below the crystalline melting point. Published oxidative induction time data for this specific product is limited; continuous hot-air exposure above 60–80 °C should be supported by lot-specific test data. The material is not intended for steam autoclave service above 121 °C or for applications requiring melt-welded joints without specialized tooling. Ultraviolet exposure causes surface oxidation and embrittlement; outdoor use of the unfilled grade may require additional UV stabilization or protective shielding.
