| HS Code | 447969 |
| Notched Charpy Impact Strength | No break |
| Abrasion Resistance | Very high |
| Water Absorption | <0.01 |
| Chemical Resistance | Excellent |
As an accredited Beijing Evergrow Resources UHMWPE ER-23 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Beijing Evergrow Resources UHMWPE ER-23 is supplied in 25 kg net multiwall paper bags, palletized and stretch-wrapped for transport. |
| Container Loading (20′ FCL) | 20′ FCL loads 18–20 MT of Beijing Evergrow Resources UHMWPE ER-23 in 25 kg bags, palletized, securely shrink-wrapped for shipment. |
| Shipping | Beijing Evergrow Resources UHMWPE ER-23 typically ships as a non-hazardous, non-regulated thermoplastic resin in 25 kg bags, octabins, or bulk bags. Keep dry, away from heat, sunlight, and contamination. Use standard PPE and avoid dust. Transport under DOT/IMDG/IATA not regulated. |
| Storage | Store Beijing Evergrow Resources UHMWPE ER-23 in a cool, dry, well-ventilated warehouse. Keep original packaging sealed, labeled, and closed when not in use. Protect from direct sunlight, heat, flames, ignition sources, strong oxidizers, moisture, dust, and contamination. Store away from incompatible materials. Use first-in, first-out rotation. Maintain clean handling areas; no special temperature control unless supplier specifies otherwise. |
| Shelf Life | Beijing Evergrow Resources UHMWPE ER-23: approximately 24 months in original sealed packaging, stored dry, cool, and protected from UV light. |
In lithium-ion battery separator production, Beijing Evergrow Resources UHMWPE ER-23 is introduced as the high-molecular-weight tie-chain fraction in a wet-process UHMWPE/HDPE blend. Lines equipped with co-rotating twin-screw extruders of L/D 44–60 and slot dies with lip gaps of 800–1,500 µm operate with paraffin oil plasticizer ratios between 55 wt% and 75 wt% because lower oil content pushes melt pressure beyond 220 bar and higher oil content produces exudation defects on the chill roll. Barrel temperatures are zoned from 180 °C to 240 °C; the ER-23 fraction remains partially unmelted during mixing, so 20–40 µm breaker plates are installed before the metering pump to retain the gel network while removing carbonized particulates. The ER-23 fraction is controlled between 15 wt% and 35 wt% of the polyethylene component; below this window, biaxial stretching at 90–120 °C creates insufficient tie-chain fibril density to support pore sizes below 1 µm, while above this window ungelled particles appear as gel specks and raise Gurley permeability variability beyond ±15% batch-to-batch. Cast film is quenched on chill rolls at 15–30 °C to freeze the oil-rich phase, calendered to 300–700 µm, and passed through countercurrent extraction using methylene chloride or n-heptane until residual plasticizer content is below 0.3 wt%. Biaxial stretching follows in sequential or simultaneous frames with machine-direction ratios of 3–7× and transverse-direction ratios of 4–8×; the transverse strain rate is capped below 15%/s because the high-molecular-weight fraction increases melt strength but reduces chain mobility at the clip points. Heat setting at 120–135 °C stabilizes the porous structure, after which final separator thickness of 5–25 µm is evaluated for Gurley air permeability under JIS P 8117 and pore size distribution by mercury intrusion per ISO 15901-1:2016. The primary process conflict is the metastable gel network: chill roll temperature variation above ±3 °C causes edge-to-center porosity drift, and the same ER-23 addition that raises puncture resistance can depress transverse stretch uniformity if the plasticizer extraction rate is too rapid. Published data for this specific ER-23 formulation is limited; the stated operating ranges are drawn from industrial wet-process UHMWPE/HDPE separator practice rather than a proprietary Beijing Evergrow compounding specification.
Across gel-spinning lines processing ER-23, solution concentration is maintained between 6 wt% and 12 wt% in decalin or mineral oil because higher concentrations elevate extensional viscosity beyond the range of piston metering pumps and lower concentrations depress as-spun gel strength. Dissolution is carried out in jacketed vessels under nitrogen blanketing at 140–160 °C for 2–4 h, with headspace oxygen kept below 100 ppm because hot polyethylene radicals cause chain scission that can reduce viscosity-average molecular weight by 10–30% before spinning. The solution is filtered through sintered metal screens of 20–40 µm and metered to spinnerets with capillary diameters of 0.8–1.2 mm at 0.2–0.6 g/min per hole. Gel filaments are quenched in water at 5–20 °C, extracted in trichloroethylene, n-hexane, or supercritical carbon dioxide to residual solvent below 100 ppm, and drawn in multiple stages: 2–10× as-spun, 10–20× after extraction, and hot drawing at 140–150 °C to total draw ratios of 60–120×. The draw ratio ceiling is set by fibrillation: above approximately 100× total draw, individual filament linear-density variation exceeds 2.5% and further drawing stabilizes or reduces tenacity. Comparative gel-spun UHMWPE filament data report tenacity of 2.8–4.1 GPa, initial modulus of 90–140 GPa, and elongation at break of 2.5–4.5% measured under ASTM D885M or ISO 2062. ER-23 molecular-weight distribution influences the gel-state entanglement network; over-rapid solvent removal produces a skin-core density gradient that lowers the hot-draw ratio by more than 15%. End products include cut-resistant gloves, marine ropes, and unidirectional ballistic laminates consolidated at 120–130 °C and 15–25 MPa.
Under sand-slurry conditions and low-speed sliding contact, compression-molded or ram-extruded ER-23 wear components are used in bottling, packaging, and bulk-materials conveyors where stainless steel chain wear and noise generation are operational bottlenecks. Compression molding is run at plateau temperatures of 190–220 °C and pressure of 3–10 MPa; because melt flow rate under ISO 1133-1:2022 is effectively absent in UHMWPE of this molecular weight, screw plasticization is excluded. Ram extrusion of rectangular and round bar stock uses die temperatures of 180–210 °C, ram pressures of 20–60 MPa, and cooling rates of 0.2–0.8 °C/min to prevent sink marks and internal voids. In dry sand/rubber wheel abrasion per ASTM G65 Procedure B, UHMWPE mass loss is generally below 0.15 g/min, while sliding coefficient of friction against polished steel is 0.07–0.15 at 0.1 m/s and 0.25 MPa contact pressure. In wet sand-slurry service, accelerated wear appears when quartz content exceeds 80% or particle size exceeds 300 µm; dry-running PV limit is approximately 0.07 MPa·m/s, above which frictional heat softens the surface and accelerates abrasive loss. The ER-23 configuration does not require internal lubricants for dry food contact, but external paraffinic oil is sometimes applied to reduce break-away friction. Published data for this specific configuration is limited; the values reflect general UHMWPE tribological data from industrial wear-guide practice.
For implantable orthopaedic bearing stock, ER-23 lot release under ISO 5834-2 and ASTM F648 requires density of 930–944 kg/m³, ash content below 200 mg/kg, tensile yield stress above 21 MPa, elongation at break above 300%, and notched Izod impact strength above 50 kJ/m². The virgin powder is consolidated at 190–225 °C under 7–14 MPa; insufficient sintering temperature or dwell time generates fusion defects that are detectable by thin-section transmitted-light inspection and correlate with elevated wear rate in hip simulator testing. Lot release includes bulk density measurement by ASTM D1895 Method A; a deviation outside 0.40–0.50 g/cm³ changes mould fill and increases entrained porosity. Wear-reducing crosslinking is achieved by gamma irradiation at 50–100 kGy, followed either by remelting to extinguish residual free radicals or by stabilization with vitamin E at 0.1–0.3 wt% to suppress long-term oxidation. Oxidation index measured by ASTM F2102 remains below 0.1 immediately after processing and below 1.0 after accelerated aging per ASTM F2003. Sterilisation validation includes ISO 11137 dose audit and ISO 13485 production controls; packaging must limit oxygen ingress because shelf oxidation begins when free radical concentration exceeds 5×10¹⁵ spins/g. Clinical wear statements are not inferable from generic UHMWPE wear factors without device-specific simulator runs under ISO 14242-1.
Compliance matrix for downstream qualification of Beijing Evergrow Resources UHMWPE ER-23:
| Application | Standard designation | Qualification parameter or test condition | Typical criterion |
| Wet-process battery separator | JIS P 8117 / ISO 15901-1:2016 | Gurley air permeability / pore size distribution | 150–400 s/100 mL for 20 µm film / 20–80 nm mean pore |
| Gel-spun UHMWPE filament | ASTM D885M / ISO 2062 | Tenacity / elongation at break | 2.8–4.1 GPa / 2.5–4.5% |
| Conveyor wear strip | ASTM G65 / ISO 11542-2 | Dry sand/rubber wheel abrasion / ram-extruded density | <0.15 g/min / 930–944 kg/m³ |
| Orthopaedic bearing stock | ISO 5834-2 / ASTM F648 / ASTM F2102 | Density / ash / oxidation index after aging | 930–944 kg/m³ / <200 mg/kg / <1.0 |
| Sintered porous plate | ASTM E128 / ISO 4003 | Bubble point pore diameter | 5–40 µm |
| Food-contact chain guide | FDA 21 CFR 177.1520 / EU 10/2011 | Overall migration in food simulants | <10 mg/dm² at 40 °C for 10 days |
To achieve a fine-pore fluidization plate without chemical blowing agents, sintered porous sheets from ER-23 UHMWPE powder are formed in compression molds at 170–200 °C with pack pressure of 0.5–3 MPa; final pore structure is governed by feedstock particle size distribution and sintering plateau time rather than by foaming additives. Porosity is controlled between 25% and 50%, with bubble point pore diameters from 5 µm to 40 µm measured under ASTM E128 or ISO 4003. Air permeability at 200 Pa differential pressure falls between 10 L/min·cm² and 80 L/min·cm² depending on thickness and pore size. In fine-particle fluidization, sintered UHMWPE distributors resist blinding better than woven metal mesh, but the upper service temperature is limited to 80–90 °C because creep deflection beyond 0.5 mm under 0.1 MPa differential pressure becomes permanent. The structure tolerates dilute acids and alkalis; strong oxidizers such as 98% sulfuric acid or halogenated solvents can swell and degrade the pore surface. Edge cracks created by guillotine cutting act as stress risers; hot-knife edge sealing is preferred to preserve burst strength in wastewater diffusers, powder conveying plates, and battery degassing elements.
As a machinable replacement for acetal and stainless steel in food-contact chain guides, ER-23 ram-extruded profiles are produced in rectangular sections of 20–100 mm width and 10–40 mm thickness, then machined to OEM conveyor geometries. Compliance for food-contact use is demonstrated under FDA 21 CFR 177.1520 and EU 10/2011 overall migration limits using 3% acetic acid, 10% ethanol, and olive oil simulants at 40 °C for 10 days. The profile is unsuitable for continuous service above 80 °C because repeated hot-water sanitisation above this threshold reduces creep modulus and produces dimensional growth exceeding 1% after 24 h under load. Machined guide surfaces are specified below Ra 0.8 µm to restrict chain wear and biofilm adhesion; flame treatment is avoided because it creates surface oxidation without improving tribological performance. Residual stress from uneven cooling of thick bar stock is relieved by annealing at 120 °C for 1 h; omission of this step produces post-machining bowing greater than 0.3 mm/m.
Competitive Beijing Evergrow Resources UHMWPE ER-23 prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8618136850665 or mail to admin@ascent-chem.com.
We will respond to you as soon as possible.
Tel: +8618136850665
Email: admin@ascent-chem.com
Flexible payment, competitive price, premium service - Inquire now!
Beijing Evergrow Resources UHMWPE ER-23 is designated as an ultra-high molecular weight polyethylene resin within the supplier’s raw-material portfolio. The grade identifier ER-23 follows the manufacturer’s internal nomenclature rather than an ISO 1043-1 data block; therefore, the suffix does not independently establish molecular weight, viscosity number, or melt-processing behavior. UHMWPE grades of this class are typically characterized by average molecular weights greater than 1.5 × 10⁶ g/mol and by melt viscosity high enough that ISO 1133-1:2022 melt volume-flow rate testing is not meaningful. Published data for this specific configuration is limited; any downstream qualification should begin with the Beijing Evergrow Resources certificate of analysis for the exact lot and the supplier’s processing recommendation.
UHMWPE resins used for stock shapes, machined parts, and wear components are specified under ISO 11542-1:1998 and ASTM D4020-18. For a polyethylene to qualify as UHMWPE under ISO 11542-1, the viscosity number in decalin at 135 °C is typically not less than 2000 mL/g. Compression-molded test plaques from this material class commonly exhibit density between 0.930 g/cm³ and 0.945 g/cm³ when measured to ISO 1183-1. Water absorption after 24 h at 23 °C is generally reported below 0.01% per ISO 62. Shore D hardness values of compression-molded specimens fall between 60 and 68 per ISO 868, and tensile yield stress is commonly reported between 20 MPa and 25 MPa per ISO 527-2/1B. These are representative envelope values for unfilled UHMWPE; ER-23 lot-specific values must be checked against the supplier’s certificate of analysis because the grade designation alone does not provide a complete specification.
Ram extrusion of unfilled UHMWPE in the ER-23 class is performed on horizontal or vertical ram extruders with heated die bodies and water-cooled sizing sections. The barrel is charged with powder that is compacted by a reciprocating ram; the powder is fused in the die at temperatures between 190 °C and 230 °C. Die pressures can reach 10–30 MPa, depending on die length, diameter, and ram speed. A constant ram speed in the range of 0.05 m/min to 0.15 m/min for rods between 50 mm and 200 mm in diameter is used to avoid weld-line porosity and surface char. If the powder contains moisture, steam pocks and internal voids may form during fusion. Production-scale ram extrusion lines therefore include a pre-drying hopper or tray dryer when relative humidity exceeds 60%. Compression molding of the same material is conducted on hydraulic presses with clamp force sufficient to maintain 10–20 MPa on the projected part area, with mold temperatures held near 200–210 °C for 20–40 min depending on section thickness. Cooling under pressure at 10–15 °C/h reduces void formation and dimensional relaxation in thick slabs.
The molecular weight range associated with ER-23-class UHMWPE produces an entangled network that does not form a pumpable melt. On single-screw extruders with L/D ratios between 24:1 and 33:1, the polymer can stick to the screw root and bridge in the feed throat. Torque values can exceed the drive capacity of general-purpose compounding lines because the apparent melt viscosity at 190 °C may be above 10⁸ Pa·s. Conventional screw extrusion is therefore not a standard manufacturing route for this material unless the resin is specifically modified for gel spinning or microporous membrane processing. This processing constraint differentiates ER-23-class UHMWPE from lower-molecular-weight high-density polyethylene, which can be screw-extruded and injection-molded at similar temperatures but with measurable melt flow. The absence of a practical melt-phase process also means that stock shapes are produced by compression molding, ram extrusion, and skiving from compression-molded billets rather than by direct injection molding. Machine builders and converters must select equipment for powder compaction and solid-state fusion rather than for melt pumping.
UHMWPE powder can adsorb surface moisture during storage in silos or bulk bags. Pre-drying before ram extrusion or compression molding is required when relative humidity exceeds 60% or when condensation is observed on cold powder. Tray dryers or vacuum dryers set at 80 °C for 2–4 h reduce surface moisture before charging. Pre-drying above 100 °C is not recommended because it can cause particle agglomeration and reduce powder flow into the die. The presence of free moisture can be detected by a moisture analyzer using a 105 °C loss-on-drying method; the target moisture content for unfilled UHMWPE before processing is generally below 0.05%. Published data for this specific grade is limited, so ER-23’s moisture sensitivity and recommended dryer set point should be taken from the supplier’s processing guide and verified on the production line, especially for thick sections above 80 mm.
Differences between ER-23-class UHMWPE and other engineering plastics are most visible in impact, friction, and wear tests. The table below uses representative published values for unfilled UHMWPE, HDPE, PTFE, and POM; it is not a substitute for lot-specific ER-23 data. Rows marked for impact and friction are strongly dependent on molecular weight, crystallinity, and processing history.
| Property | Test method | UHMWPE envelope | HDPE | PTFE | POM |
|---|---|---|---|---|---|
| Density (g/cm³) | ISO 1183-1 | 0.930–0.945 | 0.940–0.965 | 2.10–2.20 | 1.39–1.43 |
| Tensile yield stress (MPa) | ISO 527-2/1B | 20–25 | 20–30 | 9–14 | 60–70 |
| Elongation at break (%) | ISO 527-2/1B | >300 | 300–900 | 200–400 | 15–40 |
| Notched Izod impact (kJ/m², 23 °C) | ISO 180/A | No break (>100) | 5–20 | No break | 5–10 |
| Shore D hardness | ISO 868 | 60–68 | 58–70 | 50–65 | 80–85 |
| Coefficient of friction, steel counterface, static | ASTM D1894 | 0.15–0.25 | 0.20–0.30 | 0.05–0.10 | 0.10–0.20 |
Against HDPE, the primary difference is molecular-weight-dependent abrasion resistance. Comparative volume loss should be measured under ASTM G65-16e1 or ASTM D3702-94(2019) using the same sliding partner, counterface roughness, and contact pressure. Against PTFE, ER-23-class UHMWPE shows higher notched impact strength per ISO 180/A but lower continuous-service temperature. PTFE is rated for continuous service above 260 °C, whereas unfilled UHMWPE under load is limited to approximately 80 °C. Against POM, UHMWPE provides lower coefficient of friction against steel when tested to ASTM D1894 and higher cryogenic impact, but POM has higher tensile modulus per ISO 527-2 and is more suitable for dimensionally stable small gears machined to tight tolerances.
Within the UHMWPE product family, differentiation is less visible in generic property tables and more evident in powder particle size distribution, bulk density, residual ash content, and gel-particle count. These attributes control ram extrusion output, porosity in thick sections, and surface quality in skived sheet. A grade with a narrow particle size distribution and low coarse fraction may densify more uniformly in compression molding; a grade with high bulk density may feed more consistently in ram extrusion. ER-23’s particle-size distribution and bulk density are not defined by the generic UHMWPE property envelope and must be obtained from Beijing Evergrow Resources. Published data for this specific configuration is limited; direct comparative trials against another supplier’s UHMWPE should use the same die geometry, ram speed, and cooling profile to isolate material effects.
Procurement of ER-23 for food-contact, medical, or potable-water components requires certificate of analysis and regulatory statements specific to the purchased lot. Under FDA 21 CFR 177.1520, olefin polymers may be used in contact with food only if the finished article meets extraction limitations and end-use restrictions; compliance cannot be assumed from the grade name alone. A statement from Beijing Evergrow Resources should identify whether the resin is a single polymer or contains additives, and whether the lot meets EU 10/2011 migration limits if applicable. For industrial stock shapes, the supplier’s certificate should include density, viscosity number, tensile properties, and the relevant REACH SVHC statement. If the material is to be used in the European Union, the converter must verify that the grade is registered under REACH Regulation (EC) No 1907/2006, as polymer monomers are typically registered, but the finished polymer may be exempt from registration under the polymer exemption. RoHS Directive 2011/65/EU restrictions on heavy metals are not usually limiting for unfilled UHMWPE, but a supplier declaration for lead, cadmium, mercury, and hexavalent chromium should be retained for electrical and electronic equipment components. Lot-specific documentation should also state whether the material is virgin resin or contains reprocessed material.
Unfilled ER-23-class UHMWPE is commonly machined into chain guide profiles, wear strips, star wheels, and hopper liners for dry bulk solid handling. Fabrication uses bandsaws, circular saws with carbide tips, and CNC routers with sharp high-positive rake cutters; local heating above 120 °C must be controlled because thermal expansion can cause dimensional error. In silo liners, the sheets are often installed with stainless steel studs or button-head fasteners to allow thermal movement; slotting of holes is required because the coefficient of linear thermal expansion of UHMWPE is approximately 1.5 × 10⁻⁴ K⁻¹ per ISO 11359-2. Chemical compatibility should be checked against the specific stored media; UHMWPE is not recommended for continuous immersion in strong oxidizing acids such as concentrated nitric acid or in aliphatic and aromatic hydrocarbons above 60 °C due to swelling and degradation. Ultraviolet stabilization must be confirmed with the supplier if the material is used outdoors, because unfilled natural UHMWPE develops surface embrittlement after extended UV exposure. Published data for this specific configuration is limited; field trials in the actual wear environment remain the final qualification step.
