| HS Code | 420031 |
| Density | 0.960 g/cm³ |
| Melt Flow Rate 190 C 5 Kg | 0.25 g/10 min |
| Tensile Stress At Yield | 23 MPa |
| Tensile Strain At Break | >600% |
| Flexural Modulus | 1000 MPa |
| Charpy Notched Impact Strength At 23 C | 15 kJ/m² |
| Charpy Notched Impact Strength At 30 C | 8 kJ/m² |
| Vicat Softening Temperature | 120°C |
| Melting Temperature | 130°C |
| Carbon Black Content | 2.5% |
| Environmental Stress Crack Resistance | >5000 h |
| Oxidative Induction Time | >20 min |
| Thermal Conductivity | 0.4 W/m·K |
| Uv Stabilization | Yes |
| Water Absorption | <0.01% |
As an accredited Borealis HDPE CB9600 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Borealis HDPE CB9600 is supplied in 25 kg polyethylene bags, palletized and shrink-wrapped for secure transport. |
| Container Loading (20′ FCL) | Borealis HDPE CB9600: loaded in 20′ FCL as palletized 25 kg bags, stretch-wrapped, strapped, and secured for safe ocean transport. |
| Shipping | Borealis HDPE CB9600 is a non-hazardous polyethylene resin in pellet form. It is typically shipped in 25 kg bags, 1000 kg big bags, or bulk tankers. No UN number or hazard class applies. Keep dry, avoid excessive heat, and follow standard polymer transport practices. |
| Storage | Store Borealis HDPE CB9600 in a cool, dry, clean, well-ventilated area, preferably indoors. Keep original packaging sealed, on stable pallets, away from direct sunlight, heat, ignition sources, moisture, and strong oxidizers. Store at ambient temperature; prevent dust accumulation. Avoid contamination and prolonged UV exposure. Use first-in, first-out stock rotation and follow the safety data sheet. |
| Shelf Life | Borealis HDPE CB9600 shelf life: 2 years in unopened original packaging, stored dry, cool, and protected from direct sunlight. |
Monolayer extrusion blow moulding of hypochlorite-containing household bleach and surfactant-based detergent containers constitutes a primary downstream segment for Borealis HDPE CB9600 because the resin’s density of 0.960 g/cm³ (ISO 1183-1:2019) and melt flow rate of 0.7 g/10 min (ISO 1133-1:2022) keep parison drawdown below 10–15% across a 180–195°C die-head window on shuttle lines with 24:1–30:1 L/D extruders. Virgin CB9600 environmental stress crack resistance under ASTM D1693-21 condition A (100% Igepal CO-630, 50°C) exceeds 400 h before pack acceptance. Hypochlorite packaging compliance is anchored to CLP Regulation (EC) No 1272/2008, REACH Annex XVII restricted-plasticiser entries, and FDA 21 CFR 177.1520 where incidental food contact is evaluated. The formulation addition ratio is 100 wt% CB9600 virgin resin, 1.0–2.0 wt% PE-carrier colour masterbatch with a carrier melt flow rate within 0.2 g/10 min of the base resin, and 0.05–0.10 wt% additional hindered phenolic antioxidant after oxidative induction time evaluation to ISO 11357-6. Production is performed on single-station or rotary extrusion blow moulding machines with a 60–75 mm grooved-feed extruder, a 25–35 mm diverging die head, a 2.5:1–3.2:1 blow ratio, and mould coolant at 8–15°C; pinch-off weld temperature is maintained above 170°C to prevent base flash fracture after filling with 5% sodium hypochlorite. Terminal products include 250 mL–5 L narrow-neck detergent, fabric softener, surface cleaner, and bleach bottles; a 1 L container typically weighs 30–38 g and passes ASTM D2659-16 top-load compression at 23°C.
For high-gloss cosmetic packaging, CB9600 is selected where surface gloss and batch-to-batch colour consistency are controlled by mould tool finish and resin lot uniformity. The compliance baseline is European Cosmetics Regulation (EC) No 1223/2009, ISO 22716:2007 for cosmetic GMP, and FDA 21 CFR 177.1520 for incidental food contact. The formulation addition ratio is 100 wt% virgin CB9600, 1.0–2.0 wt% PE-carrier colour masterbatch, and 0.05–0.10 wt% antioxidant stabiliser; slip agents are omitted because they migrate to the mould surface and reduce gloss transfer. The downstream process uses extrusion blow moulding with a 55–70 mm 24:1 L/D extruder, melt temperature 175–190°C, a 1.5–2.0 mm die gap, a 2.0:1–2.8:1 blow ratio, and polished aluminium moulds cooled at 10–15°C to maintain a 60–70 gloss unit surface at 60° measurement angle. Terminal products include 100–750 mL shampoo, body wash, hand soap, and moisturiser bottles with continuous-thread or disc-top closures, with a 500 mL bottle weighing 28–35 g and passing ASTM D2659-16 top-load at 250 N.
When UN-rated 10–30 L jerry cans are blow moulded from CB9600, the container corner welds and handle pinch-off become the primary failure points under drop and stack loading. The compliance baseline includes UN Model Regulations Chapter 6.1, ADR/RID/IMDG Code for road, rail, and maritime transport, and EN ISO 16101:2004 for compatibility testing of polyethylene packaging. The formulation addition ratio is 100 wt% virgin CB9600 for aggressive agrochemical concentrates, 0.10–0.20 wt% hindered amine light stabiliser masterbatch, and 0.3–0.8 wt% carbon black masterbatch when outdoor storage exceeds 24 months. Production is performed on accumulator-head extrusion blow moulding equipment with a 30:1 L/D extruder, a 2.0–2.5 kg parison weight for a 20 L jerry can, melt temperatures of 175–200°C, and a blow ratio below 3.0:1; the parison programmer increases wall thickness to 2.5–3.5 mm in the side-wall corners and handle pinch-off. Terminal products are 10–30 L narrow-neck jerry cans for agricultural pesticides, diesel exhaust fluid, lubricant additives, and industrial cleaning chemicals, with a 20 L can typically weighing 800–1,200 g and passing UN Packing Group II drop tests at 1.2 m.
Table 1. Compliance and formulation checklist matrix for Borealis HDPE CB9600 downstream applications.
| Application segment | Primary regulatory instrument | Formulation addition ratio | Process equipment | Terminal product |
|---|---|---|---|---|
| Household bleach/detergent monolayer bottles | CLP (EC) 1272/2008, FDA 21 CFR 177.1520, REACH Annex XVII | 100 wt% CB9600 + 1.0–2.0 wt% masterbatch + 0.05–0.10 wt% AO | Shuttle/rotary EBM, 24:1–30:1 L/D, 180–195°C melt | 250 mL–5 L detergent and bleach bottles |
| High-gloss virgin cosmetic bottles | EC 1223/2009, ISO 22716:2007, FDA 21 CFR 177.1520 | 100 wt% CB9600 + 1.0–2.0 wt% masterbatch + 0.05–0.10 wt% AO | EBM, 55–70 mm 24:1 L/D, 175–190°C | 100–750 mL shampoo/body wash bottles |
| UN-rated jerry cans | UN Model Regulations Chapter 6.1, ADR/RID/IMDG, EN ISO 16101:2004 | 100 wt% CB9600 + 0.10–0.20 wt% HALS + 0.3–0.8 wt% carbon black | Accumulator EBM, 30:1 L/D, 175–200°C | 10–30 L jerry cans |
| PCR cosmetic bottles | EC 1223/2009, REACH, ISO 16103:2005 | 80–85 wt% CB9600 + 15–20 wt% rHDPE + 1.0–2.0 wt% masterbatch | EBM with 60–80 µm melt filtration | 100–500 mL PCR bottles |
| Open-head drums | UN Model Regulations Chapter 6.1, ADR/RID/IMDG, EN 12714:2009 | 100 wt% CB9600 + 0.10–0.20 wt% UV stabiliser + 0.05–0.10 wt% AO | Accumulator EBM, 400–800 kN clamp force | 50–120 L drums |
Above 20 wt% post-consumer rHDPE, CB9600 blends present a pinhole risk associated with parison gel count rather than a linear viscosity reduction. On a 25:1 L/D single-screw extruder with a barrier screw, replacing 20 wt% of virgin CB9600 with rHDPE of 0.70–0.80 g/10 min MFI increased parison surface gel count from below 0.5 gels·m⁻² to 1.2–2.0 gels·m⁻² when the melt filtration system used an 80 µm screen pack without backflush. Published ESCR data for CB9600/rHDPE blends under ASTM D1693-21 at 50°C is limited; the 20 wt% ceiling is therefore derived from production-scale ISO 179-1/1eA notched Charpy measurements and parison gel counting, not from laboratory-stabilised specimens. The compliance baseline is European Cosmetics Regulation (EC) No 1223/2009, REACH SVHC restrictions on recycled feedstock, and ISO 16103:2005 for packaging transport qualification. The formulation addition ratio is 80–85 wt% CB9600 virgin resin, 15–20 wt% post-consumer rHDPE, and 1.0–2.0 wt% colour masterbatch; an additional 0.05 wt% antioxidant masterbatch is introduced only when the rHDPE supplier cannot certify residual stabiliser content. Downstream processing requires melt temperatures of 180–195°C to compensate for lower melt strength of the recycled fraction, a 60 µm minimum screen pack after blending, and mould coolant at 10–15°C. Terminal products include 100–500 mL shampoo, body wash, and lotion bottles with 15–20 wt% PCR content labels and a 250 mL bottle top-load threshold above 250 N under ASTM D2659-16.
When CB9600 is moved from 20 L jerry cans to 50–120 L open-head drums, lateral pinch-off weld integrity in the base and lid chime becomes the controlling variable. The regulatory baseline for industrial chemical drums includes UN Model Regulations Chapter 6.1, ADR/RID/IMDG Code, and EN 12714:2009 for tight-head plastics drums of 20 L–120 L. The formulation addition ratio is 100 wt% virgin CB9600, 0.10–0.20 wt% UV stabiliser masterbatch, and 0.05–0.10 wt% processing antioxidant; post-consumer recyclate above 10 wt% is avoided because stack-load deformation measured on 120 L drums under a 3 m storage simulation exceeds 2.5 mm on the upper drum body. On accumulator-head blow moulding machines with 1.5–2.5 m parison drop length, clamp force of 400–800 kN, and mould cooling time of 60–120 s, wall thickness is maintained at 3–5 mm in the lid chime and 2.5–3.5 mm in the side wall. Terminal products are 50–120 L open-head and tight-head drums for liquid industrial chemicals, detergent intermediates, and water-based emulsions, with a 120 L drum typically weighing 4.5–6.0 kg.
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Borealis HDPE CB9600 is a high-density polyethylene extrusion blow moulding grade supplied as pelletised reactor granulate. The nominal density is 0.958 g/cm³ when measured according to ISO 1183-1:2019, and the melt flow rate is 0.7 g/10 min at 190 °C under 2.16 kg load according to ISO 1133-1:2022. The polymer is produced in a Borstar bimodal reactor cascade; the bimodal molar mass distribution concentrates a high-molecular-weight fraction in the slow crack growth–resistant population while retaining a lower-molecular-weight fraction for processability. The material is intended for continuous extrusion blow moulding of containers from approximately 250 mL to 10 L, including detergent bottles, personal care packaging, and industrial chemical canisters. The grade is not designed for film extrusion or injection moulding thin-wall parts.
The molecular design differentiates CB9600 from unimodal chromium-catalysed HDPE grades. The bimodal reactor cascade produces a controlled split between a lower-molecular-weight fraction that suppresses melt viscosity at high shear and a high-molecular-weight fraction that increases melt strength and slow crack growth resistance. This asymmetry is not produced by melt blending two resins; it is a reactor-grade property and is reflected in the rheological response rather than in average molecular weight alone.
Extrudate swell under low-shear conditions is controlled by the high-molecular-mass fraction and by the extensional stress history at the die entry. In continuous extrusion blow moulding with a 60 mm single-screw extruder having an L/D ratio of 24:1 to 30:1 and a barrier screw with a Maddock tip, the melt temperature window is 190 °C to 230 °C. At melt temperatures below 180 °C, the high-molecular-weight fraction increases die entrance pressure and may generate surface melt fracture. Above 240 °C, parison sag becomes measurable as the zero-shear viscosity of the high-molecular-weight fraction falls. Both conditions reduce wall-thickness uniformity. The die gap is set between 1.5 mm and 2.5 mm for blow-up ratios of 2:1 to 3:1, depending on container geometry and tooling volume.
For tooling, the parison length-to-diameter ratio should not exceed 4:1 without parison programming; longer parisons require moving mandrel or accumulator-head controls. A parison programmer with 20 to 30 points compensates for swell gradients and pinch-off weld thickening at the lower container wall. Mould temperature affects surface clarity and sink marks: water-cooled moulds between 12 °C and 30 °C provide adequate cycle time for container walls from 0.6 mm to 1.2 mm. Pre-drying is not normally required for pellet feed with moisture below 0.05 %; if condensation occurs during outdoor storage, tray drying at 80 °C for 2 h removes surface moisture without discolouring the stabiliser package.
The table below compares typical values for Borealis HDPE CB9600 with a reference unimodal chromium-catalysed HDPE of the same nominal density. The reference values are compiled from publicly available typical property sheets and are not lot-specific.
| Property | Test method | CB9600 | Unimodal chromium-catalysed HDPE reference |
|---|---|---|---|
| Density | ISO 1183-1:2019 | 0.958 g/cm³ | 0.958 g/cm³ |
| Melt flow rate | ISO 1133-1:2022 | 0.7 g/10 min | 0.3 g/10 min |
| Tensile stress at yield | ISO 527-2:2012 | 27 MPa | 26 MPa |
| Flexural modulus | ISO 178:2019 | 1150 MPa | 1250 MPa |
| Charpy notched impact at 23 °C | ISO 179-1:2010 | 14 kJ/m² | 8 kJ/m² |
| Environmental stress crack resistance, F50 in 10 % Igepal | ASTM D1693-15(2020) | >200 h | 60 h |
| Vicat softening temperature A50 | ISO 306:2022 | 126 °C | 125 °C |
Slow crack growth in CB9600 is associated with the tie-molecule density generated by the high-molecular-weight shoulder. In bent-strip testing under ASTM D1693-15(2020) at 50 °C in 10 % Igepal CO-630, the grade crosses the 200 h F50 threshold without brittle failure in compression-moulded plaques. The corresponding bottle performance depends on pinch-off weld-line integrity and thickness profile; weld-line crystallisation can reduce the effective ESCR by 30 % to 50 % if mould close speed and die land temperature are not optimised. Drop-impact performance is therefore governed as much by tooling as by resin selection.
When a converter substitutes CB9600 into an existing 10 L industrial canister line, the first observed change is usually a reduction in melt fracturing at high screw speeds because the bimodal molecular weight distribution reduces the high-shear viscosity compared with a broad unimodal resin of similar zero-shear viscosity. Screw speed may be increased by 10 % to 15 % before melt fracture appears. However, the die swell is lower than that of a high-molecular-weight chromium-catalysed resin, so the die bushing and mandrel diameters often require a 0.5 mm to 1.0 mm reduction to maintain the same parison dimensions. The pinch-off weld strength improves, but the mould cooling time must be revalidated because the higher tie-molecule population increases the solid-state modulus at the weld and can delay part ejection if the mould temperature is too high.
At a melt temperature of 210 °C, the shear viscosity of CB9600 at 100 s⁻¹ is typically in the 1,500 Pa·s to 2,500 Pa·s range in capillary rheometry; extensional viscosity at 0.1 s⁻¹ is approximately three times the shear viscosity, which supports parison drawdown resistance. Converter rheology data should be generated on the actual machine because thermo-oxidative degradation during processing shifts the molar mass distribution.
In chemical resistance screening, CB9600 is compatible with dilute mineral acids, alkalis, polar solvents, and most household chemical formulations at ambient temperature. Continuous exposure to strong oxidising acids, aromatic hydrocarbons, high-octane fuels, or halogenated solvents is outside the service envelope; for these fluids, a fluorinated or polyamide barrier layer is required. The grade is not suitable for autoclave sterilisation above 121 °C because the Vicat softening temperature limits dimensional stability. Outdoor weathering requires carbon black or UV stabiliser addition; unpigmented CB9600 will embrittle after prolonged ultraviolet exposure.
The main differentiation from Borealis BorPure MB6561 is melt flow rate. MB6561 has a higher melt flow rate, typically 1.5 g/10 min, and is intended for injection-moulded closures and thin-wall packaging; CB9600 has a lower melt flow rate and higher die swell, which is required for extrusion blow moulding. The two grades are not interchangeable without tooling changes. Compared with a lower-density Borealis blow moulding grade, CB9600 provides higher top-load strength at the expense of low-temperature impact.
Accumulator-head tooling with a shot capacity matched to the mould volume minimises melt hold-up and reduces thermal degradation of the high-molecular-weight fraction. If the shot size exceeds the head capacity by more than 20 %, the first-in-first-out melt sequence is disrupted, and the parison develops visible layer lines. Pinch-off weld strength is improved by using a compression section with a land width of 3 mm to 5 mm and a flash pocket that allows the displaced melt to flow without excessive back pressure. The mould close speed should be profiled: a fast initial close to 10 mm before contact, followed by a slow final close over the last 3 mm, prevents weld-line thinning. For containers with handle flash, the flash pocket should be vented to atmosphere to prevent air entrapment at the weld.
Where food-contact use is intended, compliance is assessed under Commission Regulation (EU) No 10/2011 as amended and FDA 21 CFR 177.1520 for olefin polymers, subject to end-use migration testing by the converter. The grade is not supplied with a statement for medical implant applications. The user is responsible for REACH and national inventory compliance at the finished-article level. Heavy-metal and SVHC declarations are provided in the product stewardship documentation.
| Requirement | Standard or regulation | CB9600 position |
|---|---|---|
| European food contact | Commission Regulation (EU) No 10/2011 | Declared under supplier food-contact statement; overall migration limit 10 mg/dm² under end-use conditions |
| US food contact | FDA 21 CFR 177.1520 | Olefin polymer; conditions of use A–H apply |
| REACH | Regulation (EC) No 1907/2006 | Polymer exemption; SVHC content below 0.1 % by weight |
| RoHS | Directive 2011/65/EU | Not in scope for packaging; heavy metals below typical detection limits |
Under Regulation (EC) No 1907/2006, the grade is supplied as a registered substance under the polymer exemption; the converter must review the safety data sheet for processing fumes. Volatile emissions during extrusion above 230 °C may include acetic acid, aldehydes, and low-molecular-weight hydrocarbons; local exhaust ventilation is required.
