Celanese HDPE GF40-01
- Product Name: Celanese HDPE GF40-01
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Celanese HDPE GF40-01 is typically used in formulations when high stiffness and dimensional stability requirements and melt temperature and residence time limits must be controlled within specific ranges.
| HS Code | 183956 |
| Polymer Type | High Density Polyethylene (HDPE) |
| Glass Fiber Content | 40% |
| Density | 1.20 g/cm³ |
| Tensile Strength | 90 MPa |
| Tensile Modulus | 8000 MPa |
| Elongation At Break | 2.0% |
| Flexural Modulus | 7000 MPa |
| Flexural Strength | 130 MPa |
| Notched Izod Impact | 120 J/m |
| Unnotched Izod Impact | 600 J/m |
| Heat Deflection Temperature At 1 8 Mpa | 130 °C |
| Heat Deflection Temperature At 0 45 Mpa | 145 °C |
| Melting Point | 130 °C |
| Water Absorption | 0.02% |
| Mold Shrinkage | 0.2-0.4% |
| Processing Method | Injection Molding |
As an accredited Celanese HDPE GF40-01 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Celanese HDPE GF40-01 typically comes in 25 kg polyethylene-lined bags, palletized, or 1,000 kg bulk bags for industrial use. |
| Container Loading (20′ FCL) | Celanese HDPE GF40-01 is loaded in a 20-foot FCL dry container, palletized in bags, secured for safe ocean transport. |
| Shipping | Celanese HDPE GF40-01 is shipped as a non-hazardous, non-regulated solid thermoplastic resin, usually in sealed 25 kg bags or octabins on pallets. It is not classified as dangerous goods. Protect from moisture, heat, and contamination. No UN number, hazard class, or packing group applies; follow local transport rules. |
| Storage | Store Celanese HDPE GF40-01 in a cool, dry, well-ventilated area, away from direct sunlight, heat, sparks, and flames. Keep original containers tightly closed and off the floor to prevent moisture pickup. Avoid contact with strong oxidizers. Protect from UV and dust. Maintain moderate temperatures; avoid excessive stacking and physical damage. Follow local regulations and SDS. |
| Shelf Life | Shelf life is typically 24 months from manufacture when stored unopened in original packaging under cool, dry, ventilated conditions. |
In chemical transfer pumps, the volute and associated impeller housing are load-bearing pressure boundaries that see repeated hoop stress from impeller pressure pulses, thermal expansion during liquid temperature swings, and chemical exposure from the pumped medium. A 40 wt% glass-fiber HDPE compound such as Celanese HDPE GF40-01 is selected when the fluid is a weak acid, alkali, or brine at 20–60 °C and the hoop stress exceeds the long-term creep modulus of unfilled HDPE. Glass content is verified by ashing at 625 °C per ISO 3451-1. Fiber-matrix coupling determines whether the tensile modulus exceeds 6,000 MPa; uncoupled glass in HDPE gives lower stiffness and early fiber pullout at weld lines.
In two-cavity injection molds, splitting the melt stream around the core creates a weld line at the volute tongue. The notched Charpy value at 23 °C may be 6–10 kJ/m² per ISO 179-1/1eA, but the weld-line value is commonly 50–70% lower. A single submarine gate on the volute outer diameter or a valve-gated hot drop is therefore preferred over multiple edge gates. Barrel temperatures are maintained from 200 °C at feed to 230 °C at nozzle; mold temperature is held between 40 °C and 60 °C; holding pressure is set at 60–80 MPa hydraulic. Pre-drying is not required below 60% relative humidity; if condensation is present, drying at 80 °C for 2 h in a desiccant dryer with dew point below −20 °C removes surface moisture without thermally degrading the matrix. The terminal machined component is a pump volute or impeller shroud hydrostatically tested at 1.5 times working pressure for 15 min per ISO 5199.
| Parameter | Standard / method | Typical range |
|---|---|---|
| Glass fiber content | ISO 3451-1 | 38–42 wt% |
| Tensile modulus | ISO 527-2 | 6,000–9,000 MPa |
| Flexural modulus | ISO 178 | 5,500–8,500 MPa |
| Notched Charpy at 23 °C | ISO 179-1/1eA | 6–12 kJ/m² |
| HDT-B at 0.45 MPa | ISO 75-2/B | 95–125 °C |
| CLTE flow direction | ISO 11359-2 | 30–55 × 10⁻⁶ K⁻¹ |
Under cyclic vibration from a 2.0 L four-cylinder diesel engine, mounting points on a glass-filled HDPE fan shroud operate in a stress regime where unreinforced HDPE would exceed its fatigue endurance stress at 10⁶ cycles. The 40 wt% glass network reduces the coefficient of linear thermal expansion from roughly 120 × 10⁻⁶ K⁻¹ for neat HDPE to 35–55 × 10⁻⁶ K⁻¹ in the flow direction, as measured by ISO 11359-2. That brings the shroud closer to the expansion of aluminum radiator brackets and reduces thermal stress at 85 °C continuous under-hood air temperature. At 105 °C under load, however, the HDPE matrix begins to lose stiffness. HDT-B at 0.45 MPa is typically 95–125 °C for coupled 40% GF HDPE, so design margin comes from rib geometry and glass-fiber orientation along load paths rather than from heat distortion alone.
Injection molding requires fast fill to orient fibers in thin ribs. Fill velocity at the gate is 80–120 mm/s on hydraulic presses with 1,800–2,500 kN clamp force for a shroud of projected area 800–1,200 cm². Mold temperature is 30–50 °C; cooling time is 25–30 s for 3 mm walls. Weld lines at mounting bosses are moved to low-stress areas by sequential valve gating. The terminal part is a fan shroud and intercooler baffle validated by heat aging per ISO 188 at 90 °C for 1,000 h with tensile retention above 70%, plus salt spray exposure per ISO 9227.
Chemical Storage Tank Flange Faces and Bolt Preload Relaxation
Polyolefin chemical tank fabricators use 40% glass-filled HDPE for flange faces and backing rings when the stored medium is sodium hypochlorite at pH 9–12, hydrochloric acid at concentrations below 5%, or sodium hydroxide at 30%. Neat HDPE may be specified for tank liners under DVS 2205-1; the glass-filled grade is used at the bolted interfaces because the glass phase stiffens the cross-section under uneven bolt torque. Bolt preload relaxation is a harder limit than chemical attack. Tightening of M16 A4 stainless steel bolts on a 6 mm thick flange must be limited to 15–20 N·m; higher torque causes immediate compressive yield at the bolt hole because the matrix creeps away from the bearing area. A metallic backing ring and a low-compression-set EPDM gasket are used to keep sealing face flatness within 0.3 mm over the sealing surface.
Butt fusion welding of 40% GF HDPE is not recommended because glass fibers disrupt the melt plane and reduce wall integrity at the weld. Injection-molded flanged nozzles, manway covers, and membrane support plates are used instead. Processing uses barrel temperatures of 210–230 °C, mold temperature 40–60 °C, hold pressure 60–80 MPa, and gate design that avoids multiple flow fronts at the flange face. The terminal product is a flanged nozzle assembly of 150 mm or 200 mm nominal diameter with the sealing face flatness checked against DIN 2501 flange facing requirements.
If a Logistics Pallet Is Sanitized with Steam at 121 °C
The upper service temperature of a 40 wt% glass-fiber HDPE logistics pallet is defined by the matrix, not the glass. HDPE melting point is 125–135 °C; a 121 °C steam-sanitizing cycle with even a short plateau can produce shallow surface melting, glass fiber exposure, and accumulated warpage if the pallet is under stack load. Use is therefore restricted to cold-chain, meat processing, and clean-room logistics where routine cleaning is done with 60–80 °C water or chemical sanitizers. Glass reinforcement reduces static sag of loaded pallet decks at 23 °C: creep modulus under flexural load, measured per ISO 899-2, is roughly 4,000–5,500 MPa after 1,000 h at 20 °C for coupled compounds, compared with below 1,000 MPa for neat HDPE.
For injection molding, a 1,600 mm × 1,200 mm pallet requires a clamp force of 12,000–16,000 kN and a shot weight above 18 kg. Sequential injection from multiple hot drops is used to manage flow length and avoid air traps at the deck intersections. Mold temperature is 35–50 °C; screw rotation is kept below 50 rpm to limit fiber breakage. Food-contact status must be confirmed for the matrix under FDA 21 CFR 177.1520 and EU Regulation 10/2011; the glass sizing and coupling package are not automatically covered by the base resin clearance. The terminal product is a nestable logistics pallet or freezer divider with anti-slip rubber grommets.
Agricultural filtration manifolds handling pH-adjusted water at 15–25 °C demand hoop stress retention that exceeds the long-term creep capacity of unfilled polyethylene, especially in sand media filters where laterals are exposed to cyclic pressure from backwashing. The 40 wt% glass-fiber level improves long-term hoop stress retention but reduces low-temperature impact. Below 0 °C, notched Charpy impact may fall below 4 kJ/m²; designers use a minimum wall thickness of 4 mm and avoid sharp notches to remain above 6 kJ/m² at 0 °C. Molding parameters are 220–240 °C melt temperature at the nozzle, 35–50 °C mold temperature, and screw rotation below 50 rpm to avoid excessive fiber length reduction. Pre-drying is performed at 80 °C for 2 h if the resin has been stored outside a sealed bag at relative humidity above 60%, because condensed moisture on the glass surfaces creates splay during injection. The terminal products include irrigation valve boxes, sand media filter laterals, and drip filter caps.
Valve Body and Flange Sealing Surface Flatness After Molding
A 40% glass-loaded HDPE valve body for 50 mm DIN/ANSI flanged connections is specified where the medium is sulfuric acid at 10–20% concentration and ambient temperature, because the glass network reduces cold flow at the seat and flange. Melt temperature is limited to 230 °C; HDPE near 250 °C can release oxidation volatiles that cause silver streaking and interphase debonding. The flatness of the flange sealing face is held to 0.2 mm over 100 mm by post-mold cooling in a fixture, because anisotropic shrinkage between flow and cross-flow directions can reach 0.2–0.4% and 0.6–0.9%, respectively. For low-concentration sulfuric acid service, the glass sizing must be acid-resistant; published data for this specific configuration is limited, so validation involves exposure per ISO 22088-3 at 2% strain for 120 h followed by tensile retention testing. The terminal part is a diaphragm valve body and bonnet, pressure-tested at 1.5 times rated pressure per EN 12266-1 at 20 °C for 15 min.
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- Celanese HDPE GF40-01 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 HDPE GF40-01 is a long-glass-fibre-reinforced high-density polyethylene compound supplied as cylindrical pellets for injection moulding and extrusion. The designation GF40-01 identifies a nominal glass fibre content of 40% by weight within the Celanese Celstran long-fibre thermoplastic series. In this format, continuous glass rovings are impregnated with HDPE melt through a pultrusion process and cut to nominal pellet lengths of 10–12 mm. The resulting moulded parts retain residual fibre lengths that are significantly longer than those obtained from conventional short-glass compounds, provided low-shear processing conditions are maintained. The material is specified where unfilled HDPE lacks sufficient stiffness and creep resistance but the chemical compatibility and low moisture uptake of a polyolefin matrix are still required.
What Are the Published Mechanical and Thermal Specifications for Celanese HDPE GF40-01?
The values in Table 1 are assembled from representative supplier-published typical property data for long-glass HDPE 40 wt% compounds and are expressed as ranges because fibre length distribution, moulding conditions, and test specimen preparation influence measured results. Current lot-specific certificates should be consulted before design release. The data refer to dry-as-moulded specimens conditioned according to the relevant standard procedures.
| Property | Standard | Typical range |
|---|---|---|
| Density | ISO 1183-1 | 1.21–1.22 g/cm³ |
| Glass fibre content | ISO 1172 | 38–42 wt% |
| Tensile modulus | ISO 527-2/1A | 6,800–7,800 MPa |
| Tensile stress at break | ISO 527-2/1A | 70–80 MPa |
| Tensile strain at break | ISO 527-2/1A | 2.0–2.8% |
| Flexural modulus | ISO 178 | 6,000–7,000 MPa |
| Flexural strength | ISO 178 | 90–110 MPa |
| Charpy notched impact, 23°C | ISO 179-1/1eA | 15–20 kJ/m² |
| Charpy unnotched impact, 23°C | ISO 179-1/1eU | 40–55 kJ/m² |
| Heat deflection temperature, 1.8 MPa | ISO 75-2/B | 105–115°C |
| Vicat softening temperature, B50 | ISO 306 | 120–128°C |
| Melt volume rate, 190°C/2.16 kg | ISO 1133-1 | 2–5 cm³/10 min |
| Water absorption, 24 h | ISO 62 | 0.02–0.05% |
| Mould shrinkage | ISO 294-4 | 0.15–0.40% |
Tensile modulus is measured at 1 mm/min on type 1A specimens according to ISO 527-2/1A. The wide range in Charpy values reflects the sensitivity of long-fibre compounds to fibre orientation at the gate and under notched conditions. Heat deflection temperature should not be interpreted as a continuous service temperature; continuous load-bearing use in hot air above 90–100°C requires oxidative stabiliser verification by ISO 11357-6 or equivalent long-term ageing data. The low mould shrinkage relative to unfilled HDPE is produced by the glass fibre network restricting molecular orientation and crystallinity-driven contraction, but shrinkage is anisotropic and depends on flow direction.
Structural applications for Celanese HDPE GF40-01 are concentrated in industrial equipment, material-handling, and transportation components where a combination of stiffness, chemical resistance, and low water absorption is required. Typical part configurations include fan shrouds, brackets, housings, pump bodies, rail supports, and battery carriers produced on injection moulding machines with clamp force sufficient to pack a long-glass melt. In these components, the principal design loads are flexural or short-term tensile. Creep-sensitive load cases should be assessed using data generated at the expected temperature and stress because the HDPE matrix remains thermoplastic. The glass fibre network reduces creep strain relative to unfilled HDPE, but creep rupture under constant load above 60°C must be evaluated. Published data for this specific configuration in welded or bonded joints is limited; weld-line strength reductions in long-fibre polyolefins are significant because fibres do not bridge the knit line. Flow-front weld retention in long-glass polyolefins can fall to 40–60% of the un-welded tensile strength, and tool gate location must be arranged to move knit lines away from structural load paths.
When the Processing Window Narrows: Injection Moulding Long-Glass HDPE
Processing of 40% long-glass HDPE requires a narrower melt temperature window than unfilled HDPE. Recommended melt temperatures are typically 190–230°C, with the nozzle held near 220–230°C and mould temperatures between 30°C and 70°C. Elevated temperatures above 240°C produce residence-time-dependent degradation of the HDPE matrix and reduce impact performance; temperatures below 190°C increase melt viscosity, gate freeze-off risk, and glass fibre attrition. Back pressure should be maintained between 2 bar and 5 bar hydraulic because excessive back pressure causes fibre breakage. Screw speed is normally limited to 25–50 m/min circumferential velocity. Low-shear screw geometries with a target compression ratio of 2.0–2.5:1 and a minimum metering-section channel depth of 4.5 mm are used on production-scale reciprocating screw machines. General-purpose screws with high compression and shallow metering depths reduce residual fibre length and produce lower than expected tensile modulus and Charpy impact. On 1000 kN to 3000 kN injection moulding lines, short shots and burn marks are observed when gate land or runner diameter is undersized, and warpage increases when fibre orientation is not balanced between flow and cross-flow directions.
Tool design for long-glass HDPE must address gate land length and runner sizing. Gate land length should be 0.8–1.5 mm with a minimum gate diameter of 1.5 mm for direct gates; cold runner diameters below 6 mm can cause premature orientation and pressure loss. Vent depth is typically 0.02–0.03 mm on the parting line to release volatiles from the sizing package without flash. Producing parts with wall thickness below 2.5 mm increases fibre orientation in the skin layer but may create flow hesitation at ribs. Pre-drying is not normally required unless packaging has been breached under high humidity; if surface moisture is suspected, drying at 80°C for 2–4 hours in a desiccant dryer is adequate. Long residence time above 230°C should be avoided; if interruption exceeds approximately 10 min, the barrel should be purged with a low-MFR HDPE. Incoming quality audits for long-glass compounds commonly include ash content by ISO 1172 and melt volume rate by ISO 1133-1. Lot-to-lot glass content variation of ±2 wt% can shift tensile modulus by approximately ±5%, and fibre length distribution should be evaluated after pyrolysis and optical microscopy when a moulding trial produces impact values below the expected range.
Differences Between 40% Long-Glass HDPE and Conventional Filled Systems
Table 2 compares representative property ranges for Celanese HDPE GF40-01, unfilled HDPE, a short-glass HDPE 40 wt% system, and a 40 wt% long-glass polypropylene. The primary difference lies in residual fibre length after injection moulding. Short-glass compounds typically retain fibres below 0.5 mm after plasticating, whereas pultruded long-glass pellets retain fibres of 1.5–3.0 mm in the moulded part when processed under low-shear conditions. Longer residual fibres increase tensile modulus, notched Charpy impact, and heat deflection temperature at the same glass weight fraction, but they also increase anisotropy. Fibre orientation in the skin layer is generally parallel to flow; in thick sections the core orientation may be transverse. This anisotropy is larger for long-glass HDPE than for short-glass systems and must be considered in part warpage and structural simulation.
| System | Tensile modulus, ISO 527-2/1A | Notched Charpy, ISO 179-1/1eA | HDT 1.8 MPa, ISO 75-2/B | Typical residual fibre length |
|---|---|---|---|---|
| Unfilled HDPE | 0.8–1.1 GPa | 8–15 kJ/m² | 45–55°C | None |
| Short-glass HDPE, 40 wt% | 4.5–5.5 GPa | 8–12 kJ/m² | 90–100°C | <0.5 mm |
| Celanese HDPE GF40-01 | 6.8–7.8 GPa | 15–20 kJ/m² | 105–115°C | 1.5–3.0 mm |
| Long-glass polypropylene, 40 wt% | 7.5–8.5 GPa | 20–30 kJ/m² | 150–160°C | 1.5–3.0 mm |
Compared with polypropylene long-glass grades, HDPE GF40-01 has a lower heat deflection temperature and lower modulus, but the polyolefin matrix offers lower water absorption and better resistance to polar chemicals in some acid and base environments. Final material selection must compare immersion data generated under the actual chemical concentration and temperature. Compared with mineral-filled HDPE, the glass-filled grade produces higher tensile strength and modulus but displays more pronounced fibre orientation and greater notch sensitivity. The product is not a direct substitute for short-glass HDPE in parts with complex knit lines because long-glass compounds exhibit lower flow-front weld strength retention. Published data for direct substitution into existing short-glass tools without gate or runner modification is limited; most documented production experience indicates that the gate and runner system must be enlarged and the injection speed reduced to protect fibre length.
Material boundaries must be acknowledged before converting a component from another polymer or metal. Celanese HDPE GF40-01 is not recommended for continuous load-bearing service in hot air above 90–100°C without oxidative ageing validation. It is incompatible with strong oxidizing acids and is susceptible to environmental stress cracking in some chlorinated solvents and certain detergent systems. Tests according to ISO 22088-3 bent-strip method or a comparable constant-strain method should be performed for each chemical contact condition. For applications requiring UL 94 flammability classification or specific automotive interior emission limits, the current regulatory data sheet and lot documentation must be consulted because glass-filled polyolefin grades can vary by colour and additive package. In machining and assembly, the anisotropic glass fibre network affects hole quality and thread-forming behaviour; drill speeds below 60 m/min and low-feed cutting tools reduce delamination. Design release requires part-specific validation on production-scale equipment with the actual processing parameters and fibre orientation state.
