| HS Code | 924802 |
| Density | 0.958 g/cm3 |
| Melt Flow Rate 190 C 2 16 Kg | 7.0 g/10 min |
| Tensile Strength At Yield | 30 MPa |
| Tensile Elongation At Break | 1000% |
| Flexural Modulus | 1300 MPa |
| Notched Izod Impact Strength | 4.0 kJ/m2 |
| Shore D Hardness | 65 |
| Vicat Softening Temperature | 125°C |
| Heat Deflection Temperature 0 45 Mpa | 75°C |
| Melting Point | 135°C |
| Environmental Stress Crack Resistance | >1000 h |
| Molding Shrinkage | 1.5-3.0% |
As an accredited Asahi Kasei HDPE SUNTECH QT701A factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Asahi Kasei HDPE SUNTECH QT701A is packaged in 25 kg polyethylene-lined paper bags, supplied palletized for industrial use. |
| Container Loading (20′ FCL) | 20′ FCL container loading: Asahi Kasei HDPE SUNTECH QT701A, 25 kg bags, palletized, stretch-wrapped, floor-stuffed, securely braced for ocean shipment. |
| Shipping | Asahi Kasei HDPE SUNTECH QT701A is typically shipped as non-hazardous polyethylene pellets in 25 kg bags or bulk containers. Palletized, stretch-wrapped, and labeled for transport. Ship by truck, rail, or sea freight under dry, ventilated conditions; avoid moisture, heat, and contamination. Not regulated for dangerous goods. |
| Storage | Store Asahi Kasei HDPE SUNTECH QT701A in a cool, dry, well-ventilated warehouse away from direct sunlight, heat, flames, and strong oxidizers. Keep original bags sealed, palletized, and off the floor to prevent moisture and contamination. Avoid prolonged UV exposure, high temperatures, and outdoor storage. Ensure good ventilation, inspect packaging regularly, and observe first-in, first-out stock rotation. |
| Shelf Life | Asahi Kasei HDPE SUNTECH QT701A: no specific shelf life assigned; stable under proper cool, dry storage. Retest after prolonged storage. |
In municipal pressure pipe conversion, QT701A is dry-blended with carbon black masterbatch at 2.0–2.5 wt% where outdoor UV resistance is required, while non-black potable water pipe is run neat or with a 0.5–1.5 wt% pigment masterbatch. The compound must conform to ISO 4427-2 and EN 12201-2 for potable water service, with long-term hydrostatic strength classified under ISO 9080 and short-term pressure resistance tested under ISO 1167-1:2006. Pipe extrusion is performed on single-screw extruders with L/D 30:1–37:1, grooved feed sections, and barrier screws, maintaining melt temperature between 200 °C and 230 °C and die-head pressure below the melt-fracture threshold. Vacuum sizing with multi-stage cooling reduces residual ovality, and haul-off tension is controlled to hold wall-thickness eccentricity within ±2%. Terminal outputs include PE 100 pressure pipes from OD 20 mm to OD 630 mm for municipal mains and industrial effluent lines. Batch-to-batch variance in incoming resin lot melt-flow behaviour is checked under ISO 1133-1:2022 Procedure A at 190 °C and 5.0 kg, because publicly available QT701A-specific ISO 9080 curves are limited and plant validation with the selected masterbatch package is required for regulatory lot acceptance.
| ISO 1167-1:2006 | Hydrostatic strength of pipe body | No brittle failure under specified hoop stress for PE 100 grade at 20 °C and 80 °C |
| ISO 9080 | Long-term hydrostatic strength regression | Basis for minimum required strength classification |
| ISO 13479:2009 | Notched pipe slow crack growth resistance | Resistance to crack propagation in notched pipe test |
| ISO 17855-2 | Polyethylene compound specification | Classification and designation of PE moulding and extrusion materials |
High-shear accumulator-head blow moulding of QT701A at 100 wt% virgin content requires the melt stream to retain sufficient molecular weight distribution to resist sag during parison drop lengths exceeding 1 500 mm. In-plant regrind is limited to ≤30 wt% for non-food industrial packaging, while direct food contact applications require that the regrind stream originate from the same production line and be validated under FDA 21 CFR 177.1520 and EU 10/2011. Dangerous-goods containers are assessed under UN 1H1 for non-removable-head drums and UN 1H2 for removable-head drums. Processing is conducted on accumulator-head blow moulding machines with parison wall-thickness programming, melt temperature maintained at 180–220 °C, and mould clamp force typically between 1 500 kN and 3 500 kN depending on container volume. The programme must compensate for diameter swell and wall-thinning behaviour that changes with accumulator residence time and regrind content. Field failure modes reported on production lines include top-load collapse after wall thinning below 0.8 mm in the chime area and parison tear when melt temperature falls below 180 °C. Terminal products include 1 000 L IBC inner bottles, 200 L open-top drums, and 20–30 L jerry cans. Published values for QT701A die swell ratio and sag time under accumulator-head conditions are limited, so line-specific parison programming must be established by barrel drop trials on the target machine.
The inner and outer high-density polyethylene layers in a six-layer fuel tank structure are processed with QT701A, with combined HDPE and in-line regrind layers typically representing 85–93% of total wall thickness, EVOH barrier layer at 1.5–3.0%, and tie resin layers at 1–2% each. Regulatory compliance is evaluated against UN ECE R34 for fuel system integrity, US EPA 40 CFR Part 86 for evaporative emission limits, and permeation test method SAE J1737. Coextrusion blow moulding is performed with melt temperatures between 200 °C and 230 °C for the HDPE layers, while EVOH is maintained in its own processing window to prevent layer rupture. Accumulator-head sequencing controls layer distribution, and die gap adjustment is used to maintain EVOH continuity without excessive shear at the tie-resin interface. Terminal products include automotive fuel tanks from 40 L to 80 L and small off-road engine tanks. No QT701A-specific SAE J1737 permeation or barrier-layer stability data are published in English datasheets; converter validation is required for the full six-layer structure because interfacial adhesion and regrind heat history materially influence tank integrity.
Corrugated drainage pipe conversion with QT701A begins as a neat resin feed or a dry blend with carbon black masterbatch at 2.5–4.5 wt% for black pipe, with an optional impact modifier masterbatch at 0.5–1.0 wt% only where low-temperature ductility below −20 °C is specified. Compliance is established under EN 13476-2 for non-pressure underground drainage and sewerage, ASTM F667 for corrugated polyethylene pipe, and AASHTO M294 for storm sewer applications. Extrusion uses a corrugator with vacuum forming and internal air pressure held between 0.02 MPa and 0.08 MPa, with melt temperature from 190 °C to 220 °C; the melt must retain enough drawdown resistance to fill corrugation profiles without thin spots at valley radii. Terminal products include perforated agricultural drainage coil from ID 50 mm to ID 200 mm and non-perforated storm water culverts. Published QT701A-specific corrugator line-speed limits are not available, so output must be validated against melt stability and corrugation geometry retention on the specific downstream forming unit.
Monofilament lines running QT701A at high orientation ratios require spinline tension mapping before production, with the resin fed neat or with a UV-stabilized masterbatch at 1.0–3.0 wt% and a processing aid at 0.2–0.5 wt% only where melt fracture occurs at elevated back pressure. Filament and netting compliance is assessed under ISO 2307 for rope breaking force and ISO 1805 for netting yarn breaking force. Extrusion is performed on single-screw extruders with melt temperature between 210 °C and 250 °C, followed by water quench at 30–40 °C, two-stage hot stretching at ratios between 1:8 and 1:12, and relaxation of 5–10% in a heated annealing stage to control shrinkage below 3%. Terminal products include industrial netting, rope yarns, and high-tenacity geotextile reinforcement filaments. A published spinline tension curve for QT701A across this draw ratio range does not exist; pilot-scale mapping under controlled quench and stretch conditions is required because excessive orientation raises brittle fracture frequency in knot loading.
Flat-die extrusion of HDPE geomembrane from QT701A is governed by the interaction between die gap, melt temperature, and cooling roll-stack temperature. The formulation includes carbon black masterbatch at 2.0–3.0 wt% and an antioxidant package pre-dispersed at 0.3–0.6 wt%, with sheet properties evaluated under GRI GM13 for HDPE geomembranes and EN 13493 for barrier sheets. Extrusion is conducted on a single-screw extruder with L/D 33:1 and a flexible-lip die having die gap between 1.8 mm and 2.5 mm, melt temperature between 200 °C and 240 °C, and a chrome-polished three-roll stack controlled at 70–95 °C. Sheet produced at 1.0–3.0 mm thickness is seamed by dual-track hot-wedge welding at 350–420 °C, with seam peel strength tested under ASTM D6392 and shear under ASTM D1004. Terminal products include landfill liners, mining heap leach pads, and secondary containment membranes. Surface haze is reported when roll-stack temperature falls below 70 °C, and QT701A-specific oxidative induction time data after welding are not publicly specified, requiring batch OIT verification under ISO 11357-6 before seam acceptance.
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Product identity: Asahi Kasei HDPE SUNTECH QT701A is a high-density polyethylene homopolymer grade in the Asahi Kasei SUNTEC polyolefin portfolio. Publicly available English-language datasheets for the QT701A descriptor remain limited, so numerical values in this document are reported as the class envelope for high-molecular-weight HDPE extrusion grades and are not a substitute for a lot-specific certificate of analysis. The material is normally supplied as pellets, carries the polyethylene CAS registry number 9002-88-4, and is relevant to extrusion markets requiring controlled melt strength, environmental stress crack resistance, and thick-section integrity.
The most consequential difference is melt-flow behavior. Injection-molding high-density polyethylene grades typically display melt mass-flow rates of 4–20 g/10 min at 190 °C under 2.16 kg piston load when measured by ISO 1133-1:2022. The QT701A designation is grouped with high-molecular-weight extrusion resins, where published SUNTEC high-density extrusion values typically fall below 1.0 g/10 min. Lower melt mass-flow rate corresponds to higher zero-shear viscosity and elevated die pressure, which reduces spiral-flow length but improves parison sag resistance in blow molding and drawdown control in sheet extrusion.
A second difference is molecular weight distribution. Injection-molding grades are formulated for pronounced shear thinning and fast relaxation, whereas high-molecular-weight extrusion grades favor a broad or bimodal distribution to raise melt strength without sacrificing processability. The consequence in production is that QT701A should not be substituted directly into a thin-wall injection mold designed for a >10 g/10 min resin; fill pressure would exceed machine capability, and short shots or gate freezing would be expected. Tooling also differs: extrusion blow molding uses accumulator heads or continuous parison dies, while injection molding uses reciprocating screws and positive shut-off nozzles. For QT701A, die head pressure, extruder torque, and parison programming are the governing parameters rather than injection clamp force.
On production-scale grooved-feed extruders with 30:1–36:1 L/D and barrier screws, barrel settings for high-molecular-weight HDPE typically begin at 180 °C in the feed zone and progress to 210–240 °C in the metering section, with adapter and die zones maintained at 200–230 °C. Melt temperature should remain below 250 °C to limit thermo-oxidative degradation. Screen packs of 60/80/100 mesh are common, and breaker-plate pressure drop should be trended during a shift; a rise of more than 30% against baseline indicates gel or contaminant accumulation requiring screen replacement.
Shear-viscosity response for high-molecular-weight HDPE is non-Newtonian. At extrusion shear rates of 100–1,000 s−1, apparent viscosity decreases by one to two orders of magnitude relative to zero-shear viscosity. This shear thinning enables melt pumping, but the onset of sharkskin melt fracture may appear when wall shear stress exceeds the critical value, frequently near 0.1–0.4 MPa for linear HDPE at 190 °C. In blow molding, sharkskin is managed by lowering die exit velocity, raising die temperature, or using fluoropolymer processing aids at 200–600 ppm. Published data for QT701A-specific critical shear stress is limited.
Extruder back-pressure is a practical proxy for viscosity. In a 65 mm grooved-feed extruder running high-molecular-weight HDPE at 120 kg/h, head pressure can exceed 30 MPa depending on die gap and temperature profile. The screw torque limit, not motor current alone, sets maximum throughput. Field experience indicates that barrel cooling in the feed section is mandatory when groove temperatures exceed 80 °C, because premature melting reduces solids conveying and causes throughput surging.
Environmental stress crack resistance for high-molecular-weight HDPE is commonly screened by ASTM D1693-15 condition B, with notched specimens immersed in 100% Igepal CO-630 at 50 °C. Class values for extrusion grades often exceed 50 h, and bimodal resins may exceed 200 h; QT701A-specific F50 values should be requested from the supplier. Chemical resistance should be validated for the intended fluid by immersion testing according to ISO 175:2010, with particular caution for strong oxidizing acids, aromatic hydrocarbons, and chlorinated solvents at elevated temperatures.
Environmental stress crack resistance is not a single-point property; it depends on molecular weight, short-chain branching, comonomer placement, and processing orientation. In high-density polyethylene, higher molecular weight increases tie-chain density, while butene or hexene comonomer disruptions reduce crystallinity and slow crack propagation. Blow-molded containers made from high-molecular-weight HDPE often exhibit a transition from ductile to brittle failure when wall thickness falls below a critical value for a given drop energy. The standard drop test for UN-rated packaging, UN DOT 6.1.5.2 or equivalent ADR/RID provisions, imposes a specified drop height based on packaging group; high-molecular-weight extrusion grades are commonly selected when the container must pass at −18 °C after conditioning.
Processing orientation also matters. Parison programming that stretches the melt during mold closing creates orientation in the container wall; excessive orientation can reduce environmental stress crack resistance in the hoop direction. Blow-pin speed, pre-blow delay, and mold temperature of 10–20 °C are critical variables. Published data for QT701A in this specific configuration is limited, but high-molecular-weight extrusion HDPE typically requires continuous parison profiling and controlled mold venting to avoid stress concentrations at pinch-off seams.
Candidate applications for a high-molecular-weight HDPE extrusion grade with this property envelope include 20–200 L tight-head drums, intermediate bulk container bottles, automotive tank shells, and thick-wall agricultural chemical containers. The material is less suited to thin-wall injection closures, blow-molded bottles with cycle times under 10 s, or cast film below 20 µm, where high-flow or low-viscosity grades reduce energy input and improve line speed. These application statements are based on the HDPE extrusion class, not on a QT701A-specific certification.
QT701A-specific values are not published in a current English-language datasheet; the envelope below is indicative of the SUNTEC high-molecular-weight extrusion family and should be verified against a supplier certificate of analysis.
| Property | Test standard | Class envelope | Notes |
|---|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 | 0.2–1.0 g/10 min | 190 °C, 2.16 kg piston load |
| Density | ISO 1183-1:2019 | 0.950–0.960 g/cm³ | 23 °C immersion or gradient column |
| Tensile yield stress | ISO 527-2:2012 | 22–28 MPa | Type 1B specimen, 50 mm/min |
| Tensile elongation at break | ISO 527-2:2012 | 600–900% | Thickness-dependent; includes necking |
| Flexural modulus | ISO 178:2019 | 900–1,200 MPa | Secant modulus, 2 mm/min |
| Vicat softening temperature A50 | ISO 306:2022 | 120–128 °C | 10 N load, 50 °C/h heating rate |
| Shore D hardness | ISO 868:2003 | 60–66 | 15 s reading |
| Environmental stress crack resistance F50 | ASTM D1693-15 | 50–200 h | 50 °C, 100% Igepal CO-630; bimodal grades may exceed 200 h |
Differences among HDPE processing families are summarized below. The QT701A position is inferred from its extrusion orientation and not from a grade-specific datasheet.
| Family | Typical melt mass-flow rate | Typical density | Critical production parameter | Observed limitation |
|---|---|---|---|---|
| High-molecular-weight extrusion / QT701A inferred | 0.2–1.0 g/10 min | 0.950–0.960 g/cm³ | Die head pressure 20–35 MPa | Lower throughput than injection; elevated melt strength required |
| Injection-molding HDPE | 4–20 g/10 min | 0.955–0.965 g/cm³ | Spiral-flow length 300–600 mm at 2 mm wall | Reduced environmental stress crack resistance and low-temperature impact |
| Film-extrusion HDPE | 0.5–2.0 g/10 min | 0.945–0.955 g/cm³ | Blow-up ratio 2:1–4:1 | Lower stiffness and barrier versus higher-density grades |
Regulatory compliance for polyolefin homopolymer may be available under EU Regulation (EC) No 1907/2006 (REACH), Directive 2011/65/EU (RoHS), and FDA 21 CFR 177.1520(c) for food-contact use; QT701A-specific certification should be confirmed before commercial use. Do not blend with amine-based additives unless compatibility testing at processing temperature has been performed, because acid-base reactions or odor generation may occur in melt processing. Pre-drying is not required below 0.05% surface moisture; stored outdoor material should be dried at 80 °C for 2 h before extrusion when ambient relative humidity exceeds 60%.
