Extrusion blow moulding of industrial chemical packaging from Borealis HE1345 is executed with a melt temperature of 180°C to 210°C, a die temperature held within 5°C of the melt, and a mould cooling temperature of 15°C to 30°C. On shuttle-type machines with 4+4 cavity moulds and 24:1 to 28:1 L/D screws, parison sag at the lower melt temperature boundary is controlled by the resin’s high molecular weight tail; at the upper boundary, blow-outs at the pinch-off weld become more frequent when the wall thickness in the chime region drops below 2.0 mm. The grade’s melt flow rate of 0.45 g/10 min at 190°C/2.16 kg (ISO 1133-1:2022) and density of 944 kg/m³ (ISO 1183-1:2019) place it in the high-molecular-weight HDPE class for jerrycan bodies, while the environmental stress crack resistance measured on notched specimens under ASTM D1693-15 condition B in 10% Igepal CO-630 typically exceeds 1000 h for virgin material. In formulation, the extrusion feed is commonly composed of 70–80 wt% virgin HE1345, 20–30 wt% clean internal regrind, and 2.0–3.0 wt% carbon black masterbatch meeting ISO 6964:2019 for UV-stabilized black HDPE pipe and sheet; no pre-drying is required below 60% relative humidity, though surface condensation on pellets stored outdoors above 85% RH should be removed with a dehumidified air hopper at 60°C for 1 h to avoid splay in the pinch-off zone. The die gap is set to 1.5–2.5 mm, blow air pressure is maintained at 0.6–0.9 MPa, and accumulator head tooling uses a die land length of 10–15 times the die gap to stabilize the parison surface. Blown containers for UN-certified chemical transport require hydraulic internal pressure testing at 100 kPa for 30 min, drop testing at -18°C for packing group II liquids up to 1.2 g/cm³ density, and stack load testing per UN Model Regulations Chapter 6.1.5. Continuous exposure to strong aromatic solvents such as xylene or to methyl ethyl ketone above 40°C is outside the operating boundary of untreated HE1345; in such service, post-mould fluorination or polyamide barrier coextrusion is required to reduce solvent permeation and stress crazing at the pinch-off weld. Terminal articles include 10 L, 20 L, and 25 L jerrycans, automotive coolant concentrate bottles, and industrial solvent containers where the wall thickness in the base and handle areas is not less than 2.0 mm to 3.5 mm.

What Limits Continuous Use of HE1345 in Agricultural Chemical Packaging?

Agricultural crop protection and fertilizer bottles are blow moulded from HE1345 on reciprocating-screw shuttle machines with 8 to 12 cavities and parison programming for non-round shapes. The bottle wall thickness is maintained at 1.2 mm to 1.8 mm for 1 L and 5 L containers, with the neck finish cut to the closure manufacturer’s 38 mm or 45 mm three-start thread dimensions. Formulation for UV-exposed crop protection bottles includes 2.5 wt% of a HALS/UV absorber masterbatch based on a HDPE carrier, 1.5 wt% zinc stearate slip/anti-block, and 20 wt% closed-loop regrind; the regrind fraction is controlled to prevent accumulation of low-molecular-weight oxidation products that reduce ESCR below 800 h under ASTM D1693-15. The processing window is narrower than for industrial jerrycans because water-based suspensions may require hot fill at 60°C, and demoulding is followed by flame treatment or corona discharge at 40–50 mN/m surface energy for label adhesion. Xylene-based emulsifiable concentrates and high-odor organophosphate formulations attack the polyethylene at the pinch-off weld and permeate through the bottle wall; untreated HE1345 is therefore restricted to water-based formulations or packages with secondary barrier liners. In-line fluorination with 0.5–1.0% fluorine in nitrogen for 60–120 s is used to reduce toluene permeation by approximately 1–2 orders of magnitude, but this step raises the bottle surface fluorine content and can alter cap torque retention. The terminal containers are 1 L, 5 L, and 10 L crop protection bottles that must pass UN drop tests, cap leakage at 30 kPa, and label adhesion tests under ISO 2409; the absence of a data sheet value for specific fluorinated HE1345 permeation means that barrier validation should be run on the final container geometry.

When Automotive Fluid Reservoirs Are Blow Moulded Without Barrier Layers

HE1345 can be converted into windshield washer reservoirs, coolant expansion tanks, and non-pressurised auxiliary fluid bottles on accumulator-head and shuttle blow moulding machines with 1+1 to 4+4 cavity layouts. The melt temperature is held at 190°C to 205°C, die temperature at 195°C to 210°C, and mould temperature at 20°C to 40°C with high-turbulence cooling channels to reduce warpage in flat side walls. Wall thickness is programmed in three zones using a 100-point parison programmer, with the deepest draw areas kept above 2.5 mm and corners at 3.0–4.0 mm. The resin feed is a mix of 80 wt% HE1345 and 20 wt% regrind with 2.0 wt% carbon black masterbatch for outdoor UV resistance per ISO 4892-2 cycle A, which is a relevant precondition before heat aging. The main process conflict is coolant reservoir underhood exposure: at continuous service above 105°C the HDPE softens and the reservoir can deform under radiator pressure pulses; at temperatures below -30°C the notched impact strength measured on the finished part drops, and pinch-off welds are the initiation sites. Leak testing is performed at 0.3 bar gauge for 10 s, and burst testing on welded or clamped ports is not used because HDPE expands plastically before a sharp burst pressure. Automotive OEM specifications for coolant reservoirs require resistance to glycol-water mixtures at 50:50 ratio at 100°C for 1000 h; HE1345 without glass fibre or polyamide reinforcement does not meet all underhood creep requirements, so the application is limited to low-temperature and non-pressurised washer systems. The terminal products are washer bottles of 3 L to 5 L, coolant overflow containers below 1 bar internal pressure, and hydraulic clutch fluid reservoirs if the fluid is mineral-based.

In high-volume detergent and home care bottle production, HE1345 is processed on continuous wheel-type blow moulding lines and shuttle machines with 10 to 20 cavities at melt temperatures of 175°C to 195°C and cycle times of 10–15 s for 1 L bottles. The main formulation variables are white masterbatch loadings of 4–6 wt% titanium dioxide and 1.0–1.5 wt% of an erucamide-based slip/antiblock masterbatch; scented or aggressive surfactants require barrier testing because long-chain alcohols and quaternary ammonium compounds can induce stress cracking at the base flash line. The bottle wall is lightweighted to 0.6–1.0 mm in the body, with the shoulder and handle areas kept above 1.2 mm to pass top-load. Extrusion blow moulding is performed with a die gap of 0.8–1.5 mm, and blow air at 0.5–0.7 MPa is used to achieve uniform wall distribution before the part is ejected at 45°C surface temperature. Because HE1345 is a medium-high melt strength HDPE, it can sustain the deep draw required for integrated handles without excessive thinning; however, at wall thicknesses below 0.5 mm in the waist, drop impact at 5°C becomes the dominant field failure. The terminal bottles include 1 L and 2 L liquid detergent, fabric softener, and multi-surface cleaner packages; they are tested for drop resistance at -10°C, top load at 200 N, and cap torque retention after 24 h of storage. Food-contact use of these containers is not part of this grade’s typical compliance profile; the EU 10/2011 migration test would need to be completed on the final article if the supply chain places the bottle in direct food-contact service.

High-Stiffness Wall Sections in Large-Bottle Extrusion Blow Moulding

Large-volume water and technical hollow parts with wall sections above 3.0 mm are blow moulded from HE1345 on accumulator-head machines with shot capacities from 5 kg to 20 kg and screw L/D ratios of 20:1 to 30:1. The high density of 944 kg/m³ and tensile modulus of 1000 MPa (ISO 527-2:2012) allow reduction of wall thickness in technical parts such as water tanks, battery boxes, and flotation modules compared with lower-density HDPE grades. The melt temperature is set at 185°C to 200°C, with parison programming to thicken the base and corners; cooling time for 4 mm wall thickness is typically 60–120 s depending on coolant temperature and mould material. Formulation for outdoor water tanks uses 2.0 wt% carbon black masterbatch and 0.5 wt% processing aid; for battery boxes and acid-resistant secondary containment, the HDPE compound must pass sulfuric acid immersion at 35% concentration and 60°C for 30 days with a maximum weight gain of 0.25%. The process boundary is set by cooling-induced warpage: large flat panels with thickness transitions greater than 2:1 show sink marks and post-mould shrinkage differences of 1.5–2.5% in the machine direction versus 1.0–2.0% in the transverse direction after 48 h. These anisotropic shrinkage values are the reason that accumulator-head technical parts are designed with generous radii at the base and avoid sharp step changes. Terminal products include 50 L to 100 L water storage containers, industrial battery cells, and flotation bodies where the wall thickness is from 4 mm to 6 mm.

Can HE1345 Be Used in Coextruded Multi-Layer Chemical Containers?

Coextrusion of HE1345 as the outer structural layer in 3-layer or 5-layer chemical containers is performed on accumulator-head and shuttle machines equipped with multiple extruders feeding a common die head. In a 3-layer structure, HE1345 forms the outer layer at 60–70% of the total wall thickness, an adhesive tie layer is present at 2–5%, and a polyamide or EVOH barrier layer is present at 5–10%. The HE1345 layer is processed at 180–200°C, while the polyamide barrier layer is processed at 220–240°C; the die is operated with a temperature differential of 20–40°C across the layers, and the thermally sensitive adhesive tie layer must remain below 215°C to prevent gel formation. Adhesion between the HDPE surface and the tie layer is a known process conflict: if the die temperature is too low, interfacial adhesion is insufficient and delamination occurs at the flash line; if too high, the barrier layer degrades and the container fails oxygen and xylene permeation tests. For HE1345-based coextruded bottles, the container wall must pass permeation testing by ASTM D3985 for oxygen at 23°C and 0% relative humidity, and by ASTM F739 for solvent permeation in chemical protective packaging. The outer HE1345 layer provides stiffness, drop impact, and environmental stress crack resistance; the inner barrier provides chemical resistance to aromatic and oxygenated solvents. Terminal products include 1 L to 5 L multi-layer containers for industrial solvents, agricultural adjuvants, and oxygen-sensitive formulations; published data for HE1345-specific peel adhesion in coextruded structures is limited, so production qualification requires bottle drop tests at -18°C, cap torque testing, and burst testing at 0.5 bar to verify the tie-layer bond.