Haldia Petrochemicals HDPE HALENE H HD T10 is a high-density polyethylene injection moulding grade identified by a nominal melt flow rate of 10 g/10 min when measured according to ISO 1133-1:2022 at 190 °C under a 2.16 kg load. Density determined by ISO 1183-1:2019 or ASTM D792-20 is situated near 0.960 g/cm³, placing the material among the higher-crystallinity HDPE grades used for rigid injection moulded articles. The grade is produced by Haldia Petrochemicals Limited under the HALENE brand and is directed toward thin-walled housewares, caps and closures, small appliance housings, and rigid packaging components. It differs from high-molecular-weight HDPE blow moulding grades in the same portfolio by a lower melt viscosity and reduced melt strength, which favor short-cycle mould filling but limit suitability for continuous parison extrusion or large-part blow moulding. The product is therefore specified primarily for fully automatic injection moulding lines, including multi-cavity hot-runner and cold-runner tools, where shot weight is controlled by screw position and holding pressure rather than by melt tension.

What Limits the Throughput Advantage When a 10 g/10 min Melt Flow Rate Is Combined with Thin-Wall Tooling?

Under low-shear melt index conditions, a nominal melt flow rate of 10 g/10 min corresponds to lower zero-shear viscosity than that of a 0.3–1.0 g/10 min blow moulding grade. In injection moulding this reduces fill pressure and improves flow length-to-wall thickness ratio, but the throughput advantage is constrained by gate dimensions, cooling time, and the onset of jetting or flash. On production-scale injection moulding machines with clamp force in the 800–1500 kN range and general-purpose polyolefin screws of 20:1–24:1 L/D, barrel set-points from feed to nozzle are typically 200 °C, 220 °C, 235 °C, and 240 °C. Mold temperatures are ordinarily held at 15–40 °C for rapid solidification. Because the melt does not exhibit the pronounced strain-hardening of high-molecular-weight HDPE, uncontrolled acceleration through small gates can produce surface jetting or weld-line disruption. For thin-wall packaging with wall thickness below 1 mm, the gate diameter is usually kept within 0.6–0.8 mm for a 1.0 mm nominal wall section, and the filling phase should be completed within 0.08–0.25 s to prevent premature gate freeze-off. Hold pressure is then applied at 60–80 MPa hydraulic pressure until the gate seals; actual cavity pressure may vary with machine hydraulics and tooling.

Post-moulding shrinkage in Haldia HDPE HALENE H HD T10 is governed by the crystalline fraction developed during cooling and by hold pressure. For mould design, shrinkage values determined according to ISO 294-4:2018 on a 60 mm × 60 mm × 2 mm plaque are commonly between 1.5% and 2.5% parallel to flow and between 1.7% and 2.7% perpendicular to flow for HDPE of this density. Dimensional control in multi-cavity cap and closure tools depends more on holding-pressure duration than on melt temperature; increasing hold time from 0.5 s to 1.5 s can reduce sink marks but may extend cycle time by more than 7%. Core-cavity temperature differentials above 10 °C are associated with out-of-plane warpage in flat thin-wall lids. Production-scale hot-runner tools require valve-pin sequencing where the pin opening is delayed 0.02–0.05 s after the start of injection to avoid cold slug entry into the cavity.

Mechanical Property Generation Relies on ISO 527-2 and ISO 178 Specimens.

Published grade-specific mechanical property data for HALENE H HD T10 may be limited in open technical literature; therefore, the values in this section are class-typical ranges for injection moulding HDPE with a nominal density of 0.960 g/cm³ and a melt flow rate of 10 g/10 min, and they must not replace the producer’s batch certificate or final article qualification. Tensile testing under ISO 527-2:2012 on 1A specimens at 23 °C and 50% relative humidity generally gives a yield stress between 26 MPa and 30 MPa, a yield strain between 8% and 12%, and an elongation at break exceeding 200% in films and plaques but lower in rigid injection moulded specimens due to notch sensitivity and processing orientation. Flexural modulus measured by ISO 178:2019 is typically in the 1000–1300 MPa range. Notched Charpy impact at 23 °C under ISO 179-1:2010 on edgewise 80 mm × 10 mm × 4 mm bars is usually 3–5 kJ/m², and it decreases below 2 kJ/m² at −20 °C. The Vicat softening temperature per ISO 306-A50 falls near 125 °C, and heat deflection temperature under 0.45 MPa per ISO 75-2:2013 is typically 70–80 °C. These values explain why H HD T10 is selected for articles that require stiffness and moderate heat tolerance but not sustained load-bearing performance above 70 °C.

Thermal Degradation Pathways Under Screw-Shear Conditions

The melting peak of a high-density polyethylene with density near 0.960 g/cm³ is observed by differential scanning calorimetry under ISO 11357-3:2018 in the 130–137 °C range. The practical processing window is therefore considerably higher than the crystalline melting point, but it is not unlimited. Prolonged residence time above 260 °C, high screw speed above 0.3 m/s peripheral velocity, or excessive back pressure can initiate oxidative chain scission and crosslinking. The first production-scale indicators are an upward drift in melt flow rate, yellowing, and the appearance of black specks or plate-out on the mould core. In a reciprocating-screw machine with a 35 mm or 40 mm screw, melt residence time is generally held below 5 min at temperatures not exceeding 250 °C. If interruptions occur, the barrel should be purged with a fractional-melt HDPE or a commercial purge compound before restarting, and the screw should not be rotated dry. Antioxidant packages present in the as-supplied resin provide a finite processing stability window, but repeated recycling of sprues and runners can consume the package, reduce oxidation induction time, and lower notched impact strength. For critical closures or thin-wall containers, regrind addition is therefore limited to 20–30 wt% unless the processor has generated internal data confirming that final article performance remains within the relevant specification.

If the Grade Is Cross-Compared with Blow Moulding HDPE and Linear Low-Density Polyethylene, the Separation Is Driven by Melt Strength and Crystallinity.

When Haldia HDPE HALENE H HD T10 is compared with a Haldia HDPE blow moulding grade designated for large containers, the most direct difference is melt flow rate: blow moulding grades commonly operate below 1 g/10 min, whereas H HD T10 operates near 10 g/10 min. The higher melt flow rate of H HD T10 reduces injection pressure and improves replication of fine mould texturing, but it also lowers melt strength, making continuous parison extrusion or large-part blow moulding difficult. Against linear low-density polyethylene, H HD T10 has higher density and higher crystalline fraction, leading to higher tensile yield stress and flexural modulus but lower low-temperature impact and reduced environmental stress crack resistance under load. Environmental stress crack resistance can be compared by ASTM D1693-15 or ISO 22088-2; grades with higher comonomer content and lower density generally outperform HDPE homopolymer-type injection moulding grades in the presence of stress-cracking fluids. Different from HDPE pipe-grade products in the same family, H HD T10 lacks the long-term hydrostatic strength classification of PE 100 and is not intended for pressure pipe use. The practical consequence of its narrower molar mass distribution is that H HD T10 should not be processed on blow moulding screws optimized for 0.3 g/10 min resin without adjusting barrel temperatures and back pressure. When regrind or reprocessed H HD T10 is added at 20–30 wt%, the melt flow rate may increase by 5–15% depending on the number of heat histories and the level of oxidative chain scission; mechanical property loss is often concentrated in elongation at break and impact rather than tensile yield. Therefore, regrind use in food-contact packaging must be validated against the producer’s purity requirements and the relevant national legislation.

Regulatory Exposure and Extractables Screening under Food-Contact Migration Protocols

Chemical resistance of HALENE H HD T10 follows the general behaviour of high-density polyethylene: it is resistant to aqueous solutions of non-oxidizing acids, alkalis, and inorganic salts at ambient temperature, but aromatic and chlorinated hydrocarbons, strong oxidizing acids, and long-term exposure to certain soaps or vegetable oils can cause swelling or environmental stress cracking. Compatibility screening should follow ASTM D543-20 or ISO 22088-2. The grade is not hygroscopic, so pre-drying is generally unnecessary unless surface condensation occurs during cold storage; in such cases a hopper dryer at 70–80 °C for 1–2 h is sufficient. For food-contact use, the final article must meet EU Regulation (EU) No 10/2011 and the relevant national provisions, or US FDA 21 CFR 177.1520 for olefin polymers, subject to conditions of use and total migration limits. The resin does not contain intentionally added phthalate plasticizers or cadmium-based pigments, but final compliance with RoHS Directive 2011/65/EU and REACH depends on colourants and other additives introduced during compounding or masterbatch dilution. Processing above 280 °C or excessive residence time can produce odour, discoloration, and a drop in notched impact; barrel temperature settings above 260 °C are rarely necessary for this melt-flow class. H HD T10 is also incompatible with high levels of metal stearate lubricant packages that can plate out on mould surfaces and reduce gate quality over extended production runs. For multi-cavity tools running at high clamp pressures, ejection force can be controlled by specifying draft angles of 0.5–1.0° on textured surfaces rather than by increasing lubricant concentration.