Braskem (formerly Quattor) HDPE HS5407 enters closure manufacturing as an injection-moulding grade with a supplier-published density of 0.954 g/cm³ and melt mass-flow rate of 7.0 g/10 min at 190 °C under 2.16 kg load when tested to ISO 1133-1. In high-cavitation beverage closure tools, the grade is specified where the molecular weight distribution is narrow enough to limit melt elasticity and where the flow length is short enough to avoid the pressure loss of higher-viscosity HDPE grades. The standard process for 29/25 mm tamper-evident caps uses a melt temperature of 200 °C to 230 °C, mould temperature of 8 °C to 15 °C, and valve-gated hot-runner systems with 64 or 96 cavities. The lower melt viscosity at closure shear rates, typically above 10,000 s⁻¹, reduces filling pressure before gate freeze-off; however, published data for this specific configuration is limited. Compliance for this segment derives from EU Regulation (EU) No 10/2011 and FDA 21 CFR 177.1520 for olefin polymers in food-contact applications. Overall migration is assessed under EN 1186-1 using condition OM1 and food simulant E for aqueous and alcoholic closure contact. The formulation uses 100% virgin HS5407 for first-round qualification; clean in-house regrind from start-up scrap may be added up to 20 % by mass if lot-to-lot MFR and notched impact are monitored. Drying is not required when pellet surface moisture is below 0.05 %; pellets stored in cold outdoor silos may require 80 °C air drying for 2 h to prevent splay. The terminal products are 29/25 mm and 30/25 mm beverage closures with tamper-evident bands.

What Limits Thin-Wall Food Container Tooling Performance with HS5407?

Thin-wall container moulding with HS5407 is constrained less by melt temperature than by flow-length-to-wall-thickness ratio. When round or rectangular food-storage containers are produced with a wall thickness of 0.5 mm to 1.2 mm and flow ratios above 120:1, the injection speed must be set high enough to prevent freeze-off before the cavity end is filled, while hold pressure must be reduced before the gate freezes to avoid overpacking the centre of the part. Production tool qualification uses cavity pressure transducers to establish three injection-speed settings and two hold-pressure levels; process capability is then evaluated by mass consistency and wall-thickness distribution. The grade is dry-blended with clean internally generated regrind up to 15 % by mass for opaque containers, because higher use shifts the molecular weight distribution and produces inconsistent drop-impact behaviour at rim sections. EU food-contact compliance is demonstrated through overall migration in accordance with EN 1186-1, while FDA submissions rely on 21 CFR 177.1520 and the appropriate food-simulant end test. The finished products are ambient and refrigerated food-storage containers with snap-lock lids; the material does not provide glass-like clarity. Pigmentation is limited to 2 % by mass masterbatch unless spiral-flow studies confirm that the resultant MFR shift remains inside the producer’s upper control limit. The operational boundary is that HDPE deformation under sustained load increases above 40 °C; therefore HS5407 is not assigned to retort or high-temperature pasteurisation without a heat-deflection test under ISO 75-2.

When ESCR Constraints Govern Household Chemical Closure Selection

In laundry detergent and fabric softener closures, the critical failure mechanism is environmental stress cracking at the thread root, not tensile yield. The acceptance test is ASTM D1693-21 under Condition B with 100 % Igepal CO-630; users should request lot-specific F50 data from Braskem because generic HDPE values do not represent the finished cap geometry. The processing route is a high-cavity cold-runner or hot-runner closure tool with a melt temperature of 190 °C to 220 °C and a mould temperature of 10 °C to 20 °C. Cap ejection is deliberately set at 70 °C to 80 °C so that residual heat anneals the thread root before bulk packing. The formulation is unpigmented or white-masterbatched; calcium carbonate filler above 5 wt% is not used because rigid particles concentrate stress at thread roots and lower ESCR. For bleach-containing or high-pH formulations above pH 10, published data for this specific configuration is limited, and a lower-MFR HDPE or polypropylene closure grade should be benchmarked. When HS5407 is used, the terminal product is typically a 38 mm or 42 mm screw closure for stand-up pouch and rigid bottle systems. Regulatory obligations arise from the CLP Regulation (EC) No 1272/2008 for dangerous mixtures and from REACH Article 33 when the finished article contains a candidate-list substance; the closure itself is not automatically a food-contact article, and the EU 10/2011 certificate is not relevant for detergent packaging. Torque retention and seal integrity must be tested on the final bottle-neck combination because closure dimension and liner compression dominate leakage.

Industrial crate and tote moulding with HS5407 is specified for vented beverage crates and reusable logistics boxes where the wall thickness ranges from 2.0 mm to 4.5 mm and the tooling is a conventional cold-runner multi-cavity system. The process uses a barrel profile toward the lower melt temperature range of 180 °C to 210 °C to increase melt viscosity and reduce flash at the parting line; the mould temperature is held at 15 °C to 30 °C to balance impact against cooling time. Gate selection is direct sprue or fan gate rather than tunnel gate because the thick section and low pressure drop allow air evacuation without burning at the vent pins. The blend incorporates clean post-industrial regranulate from returned crates at up to 30 % by mass; when reclaim exceeds 20 %, notched Izod impact according to ISO 180/A should be monitored against the virgin lot reference. High-pressure washdown at 60 °C to 80 °C with alkaline detergents can trigger slow crack growth at weld lines and stack-rib bases; therefore the gate should be positioned away from label-recess weld lines. Compliance for reusable transport packaging is governed by REACH Article 33 and the RoHS Directive 2011/65/EU; EU food-contact status is not extended to the crate unless the moulding is explicitly used as a primary food-contact surface and covered by the supplier’s certificate. Finished products include 24-bottle crates, stack-nest trays, bread trays, and agricultural handling totes.

Low-Temperature Impact in Toy and Leisure Goods Moulding

Toy and leisure components moulded from HS5407 operate in a different regulatory envelope from packaging and transport articles. The material must meet EN 71-3 migration of 19 elements, the Toy Safety Directive 2009/48/EC, and the US CPSIA Section 101 lead-substrate limit. The process is set at a melt temperature of 190 °C to 220 °C and a mould temperature of 15 °C to 25 °C to reduce flow lines and visible knit lines on large flat surfaces. The formulation uses certified toy-grade or food-contact colour masterbatch below 2 wt%; post-consumer recyclate is not added because the CPSIA substrate and migration limits would require full chemical characterisation of every lot. Snap-fit assembly demands moderate flexural modulus as determined by ISO 178, while cold-temperature impact below -10 °C is verified by notched Izod impact in accordance with ISO 180/A. The finished products include building blocks, board-game pieces, toy wheels, and swimming-pool accessory parts. Because HS5407 is an HDPE grade, it does not deliver the soft-touch surface of SEBS-modified polyolefin compounds; parts designed with living hinges should be evaluated for flexural fatigue under repeated bending because the grade has a narrower molecular weight distribution than blow-moulding or film HDPE. Published data for this specific configuration is limited when parts are subjected to repeated snap-latch cycling below freezing; low-temperature flexibility is therefore a boundary condition, not a datasheet guarantee.

Horticultural Container Moulding Requires a Different UV and Impact Balance

Horticultural pots, trays, and carrying flats produced with HS5407 are thin-wall technical parts that are exposed to UV radiation, irrigation water, and fertiliser salts. The process uses wall thicknesses between 0.8 mm and 2.0 mm, cold-runner multi-cavity tools, and a melt temperature of 185 °C to 210 °C. Injection speed is set high to fill the drain-hole features before freeze-off; the mould is cooled at 12 °C to 25 °C to avoid warpage on the long flat base. The formulation includes a UV stabiliser masterbatch at the dose specified by the additive supplier, typically in the range of 1 % to 3 %, and up to 20 % clean regrind from edge-trim and rejected trays. Higher regrind levels reduce outdoor weathering life because the anti-UV additive package has already been partially consumed; when products are marketed for multi-season use, the producer should request QUV accelerated weathering data per ISO 4892-3 cycle 5 or the supplier’s stated test protocol. The terminal products are nursery pots, propagation trays, and transport flats. Compliance for this segment is governed by REACH Article 33 and not by food-contact legislation; however, if the pot is used for edible plants, the grower may still impose a heavy-metal migration screen according to EN 71-3. The principal incompatibility is with high-alkaline fertiliser concentrates stored in the same article above 50 °C, where stress cracking may occur at injection-gate dimples and drain-slot weld lines.