| HS Code | 438379 |
| Brand | Beijing Evergrow Resources |
| Model | UHF-W600 |
| Material | Ultra-high molecular weight polyethylene (UHMWPE) |
| Product Form | Filament yarn |
| Linear Density | 600 denier (667 dtex) |
| Tenacity | ≥30 cN/dtex |
| Elastic Modulus | ≥1100 cN/dtex |
| Elongation At Break | 3.0-4.0% |
| Density | 0.97 g/cm³ |
| Melting Point | 144-152 °C |
| Decomposition Temperature | >300 °C |
| Color | White |
| Moisture Absorption | <0.01% |
| Chemical Resistance | Excellent against acids, alkalis, and organic solvents |
| Uv Resistance | Poor; requires protection for prolonged exposure |
| Abrasion Resistance | Excellent |
As an accredited Beijing Evergrow Resources UHMWPE UHF-W600 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Beijing Evergrow Resources UHMWPE UHF-W600 is typically packaged in 25 kg moisture-resistant bags, palletized at 1,000 kg per pallet for industrial transport. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): Beijing Evergrow Resources UHMWPE UHF-W600 packed in bags, palletized, and safely secured for international export shipment. |
| Shipping | Beijing Evergrow Resources UHMWPE UHF-W600 is a non-hazardous polyethylene powder. It is typically shipped in 25 kg PE-lined bags or fiber drums, palletized and shrink-wrapped. Transport by land, sea, or air under normal conditions. Store dry, away from heat, moisture, and sunlight; no special dangerous-goods documentation required. |
| Storage | Store Beijing Evergrow Resources UHMWPE UHF-W600 in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, flames, and strong oxidizing agents. Keep containers/packages closed, clean, and clearly labeled. Avoid moisture, dust, and contamination. Use proper pallets; do not stack excessively. Maintain ambient temperature and stable conditions. Protect from physical damage and prolonged UV exposure. Follow local regulations and manufacturer guidance. |
| Shelf Life | Beijing Evergrow Resources UHMWPE UHF-W600 has indefinite shelf life if stored cool, dry, sealed, away from sunlight, UV, heat, and contaminants. |
As an incoming powder, Beijing Evergrow Resources UHF-W600 is classified as PE-UHMW under ISO 11542-1, with lot release controlled by the supplier certificate of analysis rather than by melt flow rate measurement. Melt flow testing under 2.16 kg and 190 °C in accordance with ISO 1133-1 is not meaningful for this viscosity class; viscosity number by ISO 1628-3 in decahydronaphthalene at 135 °C is the primary incoming QC parameter. Residual moisture should be below 200 ppm before dissolution or sintering because free water at processing temperatures above 160 °C hydrolyzes stabilizers and generates surface oxidation measurable as a carbonyl index increase by ISO 10640. The powder is not injection-moldable into thin sections and is not a drop-in replacement for medium-density or high-density polyethylene; downstream processing routes must account for the near-zero critical shear rate, high melt elasticity, and narrow thermal-oxidative window of PE-UHMW.
For separator casting, PE-UHMW is not processed as a neat melt; UHF-W600 is dispersed into a high-density polyethylene carrier under paraffinic process oil. Typical dry-powder splits contain 5–25 wt% PE-UHMW relative to HDPE, with total oil loading between 60 wt% and 75 wt%. The twin-screw extruder should provide L/D ≥ 48 and process oil injection downstream of the first kneading block to maintain gel uniformity. Barrel temperatures from 160 °C at the feed throat to 230 °C at the die form a narrow processing window; temperatures below 170 °C produce unmolten gels and temperatures above 240 °C accelerate chain scission in the PE-UHMW fraction. A T-die with lip gap 0.5–1.2 mm casts the gel film onto a chill roll at 15–35 °C, after which asynchronous biaxial stretching at 90–120 °C creates molecular orientation and pore formation. Extraction uses methylene chloride or n-hexane in countercurrent baths; residual oil must fall below 0.3 wt% before drying. The terminal microporous separator substrate, typically 5–20 μm thick, is slit and corona-treated for lithium-ion battery cell assembly. Tensile strength is measured to ASTM D882 and ISO 527-3; puncture resistance is evaluated under ASTM F1306; thermal shrinkage is determined by ISO 11359-2; surface resistivity is tested under ASTM D257. Compliance includes EU REACH SVHC screening and RoHS 2011/65/EU. Published data for this specific configuration is limited; the following table represents industrial ranges for PE-UHMW/HDPE wet-process systems and must be reconciled with the UHF-W600 certificate of analysis.
| Dry blend split | Process oil loading | Cast film thickness | Pore size range | Test method |
|---|---|---|---|---|
| UHMWPE 5 wt% / HDPE 95 wt% | 60–65 wt% | 15–20 μm | 40–80 nm | ASTM F316 |
| UHMWPE 10 wt% / HDPE 90 wt% | 65–70 wt% | 12–18 μm | 35–70 nm | ASTM F316 |
| UHMWPE 15 wt% / HDPE 85 wt% | 70–75 wt% | 9–16 μm | 30–60 nm | ASTM F316 |
Because neat UHMWPE cannot be melt-spun into filament without severe melt fracture and molecular entanglement loss, gel spinning is employed for UHF-W600. The powder is dissolved in decalin or mineral oil at 130–170 °C under nitrogen; solution concentration is held at 5–10 wt% to allow disentanglement. A hindered phenolic antioxidant at 0.1–0.5 wt% is standard practice, with the exact package determined by the masterbatch supplier. Spinneret holes of 0.5–1.0 mm discharge through an air gap of 2–10 mm into a water bath at 10–30 °C. Gel filaments are extracted and hot-drawn in two or three stages at 120–150 °C, with cumulative draw ratios between 40:1 and 80:1. Tensile tenacity is measured by ASTM D885; commercial PE-UHMW fibres often exceed 2.2 GPa, but UHF-W600 lot-specific tenacity requires verification on the actual draw line because molecular weight distribution and gel homogenization shift drawability. An incoming viscosity number below 2000 mL/g by ISO 1628-3 should trigger rejection for high-draw fibre applications. Terminal products include cut-resistant gloves tested under EN 388, ballistic panel inserts according to NIJ 0101.07 or STANAG 2920, and high-modulus maritime rope. Continuous service is restricted below 70 °C due to polyethylene crystal alpha-relaxation and creep; finished fibre is also incompatible with strong oxidizing acids and aromatic solvents above 40 °C.
Because UHF-W600 exhibits no meaningful melt flow under 21.6 kg and 190 °C, compression molding is the standard route for stock shapes. The powder is compacted in a hydraulic press at 8–15 MPa while the mold is heated from ambient to 190–220 °C; hold time is typically 10–15 min per 10 mm of cross-section to complete particle fusion. Cooling under sustained pressure at 5–15 K/min prevents shrinkage voids and internal stress. Demolding before the core reaches 130 °C can cause warpage in sections thicker than 40 mm. Machined components include chain guides, chute liners, pump casings, wear strips, and food-processing scraper blades. Food-contact compliance is governed by FDA 21 CFR 177.1520 and EU Regulation (EU) 10/2011, with overall migration limits specified in the regulation. Industrial UHMWPE stock also meets ISO 11542-2 and is supplied under ASTM D4020 for fabricated forms; tensile properties are tested by ASTM D638-14 or ISO 527-2. Published data for this specific configuration is limited; values for UHF-W600 must be taken from the supplier’s lot-specific certificate of analysis rather than from generic datasheets.
For porous components requiring controlled airflow or liquid permeability, sintering of UHF-W600 powder at sub-melt temperatures produces an interconnected void network without full densification. The mold is filled with classified powder and heated to 160–200 °C; particle surfaces fuse while interstitial voids remain open. Pore size is controlled by powder particle size distribution and packing density; average pore diameters typically span 5–50 μm, with bubble point and mean flow pore diameter quantified by ASTM F316. Dwell time is critical: at 180 °C, dwell longer than 90 min can collapse fine pores, while insufficient pre-drying at RH above 60% generates steam-driven macrovoids. Terminal products include pneumatic mufflers, aeration discs, chemical-resistant filter cartridges, and suction filters for particulate-laden liquids. Compliance for food and water contact falls under FDA 21 CFR 177.1520 and EU 10/2011; for drinking-water components, NSF/ANSI 51 or NSF/ANSI 61 applies depending on the installation. Because UHF-W600 is a virgin PE-UHMW resin, no plasticizer or organic binder is required; this avoids extractable contamination in pharmaceutical air or solvent filtration service.
For orthopaedic bearing applications, medical-grade UHMWPE powder is consolidated from material that has been screened against ISO 5834-1 and ISO 5834-2; UHF-W600 cannot be considered implantable unless the lot meets these specifications and the device manufacturer completes biological evaluation under ISO 10993-1. Powder is compression-molded at 190–230 °C under 10–20 MPa, followed by machining of acetabular liners, tibial inserts, or spinal disc components. Crosslinking for wear resistance uses gamma irradiation at 50–100 kGy or electron beam treatment, with post-irradiation remelting or annealing at 150 °C to quench residual free radicals; alternatively, 0.1–0.3 wt% α-tocopherol may be blended before consolidation for oxidation stability. Wear rate is evaluated on multi-station hip simulators according to ISO 14242-1 or knee simulators under ISO 14243-1. Sterilization by ethylene oxide or gamma irradiation must be validated for the final implant; oxidation resistance after irradiation is measured by ISO 5834-4 or ASTM F2102. Published data for this specific Beijing Evergrow Resources grade in medical certification is limited; the purchasing specification must require full lot traceability, particle-size distribution, and a certificate of conformance referencing the above implant standards.
| Route | Material designation | Key test methods | Compliance regime |
|---|---|---|---|
| Gel spinning | ISO 11542-1 | ASTM D885, ISO 1628-3 | EU REACH, NIJ 0101.07 |
| Compression molding | ASTM D4020, ISO 11542-2 | ASTM D638-14, ISO 527-2 | FDA 21 CFR 177.1520, EU 10/2011 |
| Sintered porous | ISO 11542-2 | ASTM F316 | FDA 21 CFR 177.1520, NSF/ANSI 51 |
| Medical orthopaedic | ISO 5834-1, ISO 5834-2 | ISO 14242-1, ISO 14243-1 | ISO 10993-1, FDA 21 CFR 177.1520 |
| Ram extrusion | ISO 11542-2, ASTM D4020 | ISO 1133-1, ISO 1628-3 | FDA 21 CFR 177.1520, NSF/ANSI 51 |
Industrially, ram extrusion remains the only continuous consolidation method for UHMWPE with negligible melt flow under 21.6 kg and 190 °C. UHF-W600 powder is metered into a heated barrel at 180–230 °C and compacted by a reciprocating ram at 20–40 MPa. The forward stroke welds powder plugs under elevated temperature; the return stroke must not pull air into the die. Dies with compression ratios of 1.5:1 to 2.5:1 and a cooling zone at 10–40 °C are used to counter backflow. Output is low: rods of 50 mm diameter may extrude at 0.5–2.0 m/h depending on barrel length and temperature uniformity. Extruded profiles are machined into gears, guide rails, star wheels, wear plates, and food equipment components. The standard for PE-UHMW molding and extrusion is ISO 11542-2; ASTM D4020 covers extruded forms in North America. Food machinery contact is controlled by FDA 21 CFR 177.1520 and NSF/ANSI 51. Because ram extrusion generates intermittent frictional heat at the barrel wall, melt temperature must be monitored with wall thermocouples; local temperature excursions above 260 °C initiate oxidative degradation and visible yellowing.
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Beijing Evergrow Resources UHMWPE UHF-W600 is supplied as a virgin ultra-high-molecular-weight polyethylene powder. The W600 designation is generally associated with a nominal viscosity-average molecular weight of 6.0 × 10⁶ g/mol; because repacked and re-labelled lots can vary by production campaign, the lot-specific certificate of analysis remains the controlling document. Standard characterisation is performed using ISO 1628-3:2010 or ASTM D4020-18 for molecular weight, ISO 1183-1:2019 for density, ISO 60:1977 for apparent density, ISO 11542-2:2013 for specimen preparation, ISO 527-2:2012 for tensile properties, ISO 180/A:2000 for notched impact, ISO 868:2003 for Shore hardness, and ISO 11357-3:2018 for melting behaviour. Published data for this specific commercial configuration are limited; the technical values below therefore reflect class-level virgin UHMWPE with a nominal molecular weight of 6.0 × 10⁶ g/mol and must be verified against supplier documentation.
For powder handling, the supplied material is typically packed in moisture-barrier bags or conductive bulk containers. Lot-to-lot median particle size is commonly reported by laser diffraction per ISO 13320:2020, with a D50 between 100 and 200 µm for many ram-extrusion and gel-spinning feedstocks. Particle size distribution controls feed density and sorption kinetics in solvent-based processes, so it should not be inferred from molecular weight alone.
The most immediate consequence of the 6.0 × 10⁶ g/mol chain length is an extreme zero-shear viscosity; compression-moulded UHMWPE in this class commonly shows melt-state viscosities above 10⁸ Pa·s at 190 °C. This rules out conventional injection moulding, single-screw extrusion, and most twin-screw plastication without solvent or plasticising additives. The grade is therefore processed by compression moulding or ram extrusion. Compression sintering is typically carried out at 190–220 °C with applied pressure from 5 to 15 MPa, followed by controlled cooling at 0.5–1.5 °C/min through the crystallisation range. Ram extrusion uses repeated compaction strokes and heated barrel walls rather than screw shear; operators monitor barrel-wall temperature, die temperature, ram stroke, and back pressure because insufficient particle fusion generates machining defects and delamination in thick sections.
Compared with a 3.0 × 10⁶ g/mol UHMWPE grade, the higher molecular weight increases entanglement density and improves crack-propagation resistance after complete sintering, but it also requires longer temperature equilibration. Production-scale ram lines frequently show that the higher-viscosity material demands a lower ram speed, a longer heated barrel zone, or both; otherwise the core of the extrudate can retain un-sintered powder. Field-observed failure modes on actual manufacturing lines include mid-thickness weld lines in 50 mm-section bars, centre voids after machining, and pressure spikes when feed density changes between shipments. These are managed through lot-specification of particle size and moisture rather than through molecular weight adjustment alone.
The values in Table 1 are class-level ranges for virgin UHMWPE at this molecular weight; they are not lot-specific certificates. Batch-specific particle size, residual moisture, and trace metal content must be controlled separately because they govern ram-extrusion and gel-spinning defects.
| Property | Typical value or range | Test method |
|---|---|---|
| Viscosity-average molecular weight | 6.0 × 10⁶ g/mol nominal | ISO 1628-3:2010 / ASTM D4020-18 |
| Density | 0.930–0.945 g/cm³ | ISO 1183-1:2019 |
| Apparent density | 0.35–0.50 g/cm³ | ISO 60:1977 |
| Tensile yield strength | 21–25 MPa | ISO 527-2:2012 |
| Elongation at break | >300 % | ISO 527-2:2012 |
| Notched Izod impact | no break / >100 kJ/m² | ISO 180/A:2000 |
| Shore D hardness | 60–70 | ISO 868:2003 |
| Vicat softening temperature A50 | 79–84 °C | ISO 306:2013 |
| Melting peak temperature | 133–138 °C | ISO 11357-3:2018 |
| Heat of fusion | 130–170 J/g | ISO 11357-3:2018 |
When the powder is stored at relative humidity above 60 %, surface moisture can produce sintering voids; predrying at 80 °C for 2–4 h in a desiccant-hopper or vacuum oven is common industrial practice. The resin should not be heated above 250 °C for sustained periods because oxidative chain scission reduces molecular weight and causes amber discoloration.
Residual titanium, aluminium, or chloride from Ziegler-type catalysts is controlled by the polymerisation system; ash content in virgin UHMWPE of this type is commonly below 0.05 wt% by ISO 3451-1:2019. For gel-spinning, transition-metal residues above certain levels can promote oxidative gel formation during dissolution. Supplier certificates should therefore report titanium, aluminium, and chloride concentrations. These trace species are more relevant to fibre colour and spin-line filter life than to solid-state wear parts.
When UHF-W600 is specified for gel-spun high-tenacity fibre production, the powder is dissolved in a high-boiling solvent such as decalin or paraffin oil to form a spin dope at polymer concentrations commonly between 5 and 15 wt%. The 6.0 × 10⁶ g/mol grade increases dissolution time and gel filtration pressure compared with 3.0 × 10⁶ g/mol equivalents; undissolved microgels and particulate contamination are more damaging to spinning continuity at high molecular weight. Industrial gel-spinning lines draw filaments to draw ratios exceeding 40, producing class-level tensile strengths of 2.5–3.5 GPa and tensile moduli of 80–120 GPa for highly oriented UHMWPE fibre, although published data for this specific UHF-W600 configuration in fibre drawing remain limited. The powder is also used in ram-extruded wear profiles such as chain guides, guide rails, conveyor wear strips, and impingement plates where low-friction sliding and high abrasion resistance are design requirements. Sintered porous parts, including battery separator feedstocks and filtration elements, can be produced by compaction and sintering, but the high molecular weight narrows the acceptable sintering band because partial fusion at the lower bound of 190 °C leaves weak interparticle boundaries and oxidative degradation begins above 250 °C.
In solid-state forming and machined components, post-machining tolerances are influenced by crystallinity and residual stress. Compression-moulded UHMWPE in this molecular weight class typically has a tensile yield strength of 21–25 MPa and a Shore D hardness of 60–70, which places it below some filled engineering polymers in compressive stiffness but above most unfilled thermoplastics in low-speed abrasive wear. The selection of UHF-W600 over lower molecular weight UHMWPE is therefore justified only when the additional molecular weight translates into a measurable gain in the specific failure mode, such as impact-initiated crack growth or fibre drawability. If the component is not impacted, not drawn, and not exposed to severe wet abrasion, the higher molecular weight may add processing cost without a corresponding service improvement.
Substitution is not drop-in. Compared with HDPE of melt-flow rate 0.2–20 g/10 min under 190 °C/21.6 kg, UHF-W600 does not flow through conventional thermoplastic conversion equipment and cannot be joined by hot-plate welding without extensive surface melting and pressure assistance. The tensile yield strength of UHMWPE is often 2–9 MPa lower than that of HDPE, while notched impact is much higher and sand-slurry and low-speed sliding wear rates are typically lower. Table 2 summarises the main class-level contrasts.
| Parameter | HDPE | UHMWPE 3.0×10⁶ g/mol | UHF-W600 6.0×10⁶ g/mol |
|---|---|---|---|
| Melt-flow test | 0.2–20 g/10 min at 190 °C/21.6 kg | not measurable on standard MFR equipment | not measurable on standard MFR equipment |
| Zero-shear viscosity at 190 °C | 10³–10⁵ Pa·s | >10⁸ Pa·s | >10⁸ Pa·s |
| Tensile yield strength | 23–30 MPa | 21–25 MPa | 21–25 MPa |
| Notched Izod impact | 4–10 kJ/m² | no break | no break |
| Processing routes | injection moulding, extrusion, blow moulding | compression moulding, ram extrusion | compression moulding, ram extrusion, gel spinning |
| Melting peak | 130–137 °C | 133–138 °C | 133–138 °C |
Against 3.0 × 10⁶ g/mol UHMWPE, the 6.0 × 10⁶ g/mol grade increases chain-entanglement density and resistance to crack propagation but magnifies the same processing constraints. In ram extrusion, the higher-viscosity grade typically requires a longer heated length, a lower ram speed, or both to achieve equivalent interparticle fusion; otherwise the core of the extrudate can retain un-sintered powder and show delamination after machining. For gel spinning, the higher molecular weight is advantageous provided dissolution and filtration keep gels free of undissolved particles. In porous-part production, the higher melt viscosity slows pore collapse and allows finer porosity, but narrows the processing window by shifting the minimum sintering temperature upward.
Operational boundaries and incompatibilities are specified by the supplier and by class-level UHMWPE data. UHF-W600 should not be processed above 250 °C for sustained periods and should not be exposed to strong oxidising acids, chlorinated solvents at elevated temperature, or prolonged ultraviolet irradiation. Joining of UHMWPE to itself or to other substrates by adhesive bonding generally requires plasma, corona, flame, or chemical etching because the non-polar surface has low surface energy; fusion welding by hot-plate techniques is not practical for thick sections due to poor melt flow. The grade is not inherently implantable or food-contact approved; if the lot is intended for orthopaedic components or food-contact articles, lot-level validation against ISO 5834-2, FDA 21 CFR 177.1520, and EU Regulation (EU) No. 10/2011 migration testing is required. Published data for the specific UHF-W600 configuration in implantable or food-contact use are limited.
