| HS Code | 792737 |
| Product Name | Braskem HDPE HDB0358 |
| Manufacturer | Braskem |
| Polymer Type | High Density Polyethylene (HDPE) |
| Density | 0.958 g/cm³ |
| Melt Flow Rate 190 C 2 16 Kg | 0.35 g/10 min |
| Tensile Strength At Yield | 25 MPa |
| Tensile Strength At Break | 30 MPa |
| Elongation At Break | >600% |
| Flexural Modulus | 1100 MPa |
| Vicat Softening Temperature | 124 °C |
| Environmental Stress Crack Resistance | >1000 h |
| Hardness Shore D | 65 |
| Brittleness Temperature | < -70 °C |
| Melting Point | 134 °C |
| Thermal Conductivity | 0.42 W/m·K |
| Water Absorption | <0.01% |
As an accredited Braskem HDPE HDB0358 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Braskem HDPE HDB0358 is packaged in 25 kg polyethylene bags, with 55 bags per pallet (1,375 kg). |
| Container Loading (20′ FCL) | 20′ FCL container loaded with Braskem HDPE HDB0358 resin in 25 kg bags, palletized, shrink-wrapped, and secured for ocean transport. |
| Shipping | Braskem HDPE HDB0358 is shipped as non-hazardous solid polyethylene pellets in 25 kg bags or 1,000 kg bulk bags, palletized and stretch-wrapped. Store in dry, cool conditions away from direct sunlight and moisture. Transport by truck, rail, or sea container at ambient temperature; no special ventilation required. |
| Storage | Store Braskem HDPE HDB0358 in a cool, dry, well-ventilated area, away from direct sunlight, heat, flames, and strong oxidizers. Keep containers or bags closed, labeled, and clean to prevent moisture, dust, and contamination. Avoid excessive stacking or pressure. Protect from physical damage and moisture ingress. Use first-in, first-out stock rotation, and follow the supplier’s SDS and local regulations. |
| Shelf Life | Typically 24 months from production when stored unopened in a cool, dry, well-ventilated area away from direct sunlight and heat. |
Extrusion blow moulding lines running Braskem HDPE HDB0358 for non-removable-head plastic jerricans typically operate at melt temperatures of 185 °C to 205 °C in the accumulator head and at die temperatures of 195 °C to 205 °C, because the high molecular weight of this resin, with a nominal density of 0.958 g/cm³ measured per ISO 1183-1:2019 and a melt flow rate of 3.5 g/10 min at 190 °C/21.6 kg per ISO 1133-1:2022, maintains parison stability during the longer pre-blow stage required for a 20 L container. Compliance for this downstream segment is governed by UN Model Regulations Chapter 6.1 design type approvals for UN 1H1 and UN 1H2 packagings, with supporting transport regulations ADR/RID/IMDG and conformity assessment procedures in ISO 16101:2004; drop impact, hydraulic pressure, leakproofness and stack tests are executed on filled jerricans conditioned to -18 °C for the drop sequence. The formulation addition ratio on a single-layer line is 100 wt% virgin HDB0358, with clean in-house regrind held to a maximum of 20 wt% when the container must retain environmental stress-crack resistance after filling with aliphatic and aromatic hydrocarbon diluents; colour masterbatch addition between 1.5 wt% and 2.5 wt% is accepted only when the masterbatch carrier is a high-density polyethylene grade with a melt flow rate below 1.0 g/10 min, to avoid generating low-viscosity domains that degrade drop impact. Production is carried out on single-screw extruders with L/D ratios of 24:1 to 30:1 and barrier screws, feeding an accumulator head with a parison programmer; die gaps are set from 2.0 mm to 3.0 mm for a 20 L parison, mould temperature is held at 10 °C to 30 °C, blow pressure is 0.6 MPa to 0.8 MPa, and total cycle time ranges from 120 s to 180 s. The terminal product types in this scenario are 10 L, 20 L, 25 L and 30 L jerricans, open-head pails and associated closure-threaded necks; these containers are filled with liquid chemical intermediates, agricultural adjuvants, cleaning concentrates and light petroleum distillates.
For pesticide formulations containing xylene/cyclohexanone mixtures above 60 wt%, the conversion of a standard monolayer HDB0358 bottle to inline-fluorinated barrier packaging shifts solvent weight loss into the range that can satisfy FAO/WHO pesticide container compatibility guidelines and UN 1H1/UN 1H2 design type approval when the filled product is transport-classified. The addition ratio is 100 wt% HDB0358 in the monolayer wall, with 0.3 wt% to 0.8 wt% hindered amine light stabilizer masterbatch and 1.0 wt% to 2.0 wt% carbon black or colour masterbatch for outdoor agricultural distribution; plasticizer and slip-agent masterbatches are excluded because migration to the inner surface during storage alters the stoichiometric take-up of fluorine. The production process is a two-stage sequence: extrusion blow moulding on a shuttle machine with an accumulator head at melt temperature 185 °C to 200 °C, followed by inline fluorination at 0.5 vol% to 2.0 vol% fluorine in nitrogen, treatment time 60 s to 120 s, and forced-air purging to remove residual hydrogen fluoride before closure application. Terminal product types include 1 L, 2 L, 5 L and 10 L bottles and jugs for organophosphate, pyrethroid, neonicotinoid and solvent-based herbicide formulations. Published data for HDB0358 specifically after fluorination is limited; processors should verify solvent weight loss according to the filled-package method of ASTM D2684-18 for each formulation rather than extrapolating from generic HDPE datasets.
Underhood coolant expansion tanks fabricated from HDB0358 are validated against ISO 16750-4:2023 for temperature, chemical and mechanical environmental loads, and material tensile properties after exposure are measured according to ASTM D638-14 using sidewall specimens machined from production parts. The formulation addition ratio is 100 wt% HDB0358 for the monolayer tank body, with 2.0 wt% carbon black masterbatch when engine bay UV exposure is expected, and no regrind when the tank must survive -40 °C cold-start impact; if regrind is introduced, it is limited to 15 wt% from identical HDB0358 coolant tanks and only after infrared sorting for carbon-black content. The downstream production process uses extrusion blow moulding with a parison die geometry programmed to deliver higher wall thickness in the pinch-off and filler-neck weld regions; melt temperature is kept at 190 °C to 210 °C, mould temperature at 15 °C to 35 °C, and blow pressure at 0.7 MPa to 0.9 MPa. The critical processing window is the parison hang time before mould closing: prolonged hang times above 8 s at melt temperatures above 200 °C cause thinning in the tank sidewall and low burst pressure after weld-line fusion. Terminal product types include coolant overflow reservoirs of 1.0 L to 3.0 L capacity, windshield washer reservoirs of 2.5 L to 5.0 L, and auxiliary fluid reservoirs for heavy-duty diesel engine bays. The operational boundary is direct incompatibility with brake fluids and with hot ethylene glycol above 125 °C; published data on long-term thermal oxidative ageing of HDB0358 in 50 vol% ethylene glycol at 120 °C is limited, so burst-pressure retention after 1000 h ageing must be verified with part-level testing rather than inferred from generic HDPE.
On four-station shuttle blow moulding machines, HDB0358 is converted at 100 wt% virgin or with 20 wt% to 30 wt% clean regrind into 1 L, 4 L and 5 L motor-oil and hydraulic-fluid bottles; the applicable material requirement is stress-crack resistance after contact with ester-based lubricant additives, tested on the finished container according to ASTM D1693-15 Condition B, because ester additives are known to initiate environmental stress cracking in lower-molecular-weight high-density polyethylene grades. Production temperatures at the die are held between 190 °C and 200 °C, mould temperature is 10 °C to 30 °C, and blow pressure is 0.6 MPa to 0.7 MPa; the shrink label panel is calibrated in the mould to avoid post-mould ovality. Hot-fill is not recommended above 70 °C, and published data for this specific bottle size and neck finish configuration is limited beyond standard ESCR, so any formulation change requires bottle burst testing under ASTM D2463-15 drop-impact conditions.
A three-layer accumulator head fed by two single-screw extruders places HDB0358 as both the inner and outer skin layers, with a post-consumer recyclate core at 40 wt% of total wall mass, to meet EU Packaging and Packaging Waste Regulation (EC) No 1907/2006 REACH and the recycled content claims verified under ISO 14021:2016. The addition ratio in this construction is 20 wt% HDB0358 outer layer, 40 wt% PCR core, and 40 wt% HDB0358 inner layer; the inner layer is maintained at 100 wt% virgin HDB0358 because it is the only layer that contacts the filled product and therefore controls ESCR and permeation. The downstream production process requires separate melt temperature management: the virgin layers are processed at 190 °C to 205 °C, while the PCR core is restricted to 180 °C to 195 °C to avoid gel formation and viscosity instability from residual contaminants; the two melt streams are combined in an A/B/A feedblock before the die, with a die gap of 2.5 mm to 3.5 mm, blow pressure 0.7 MPa to 0.9 MPa, and cycle time increased by 10% to 15% compared with monolayer because the lower-strength core slows cooling and reduces top-load stiffness. Terminal product types are non-food household and industrial chemical bottles of 750 mL to 5 L, such as laundry detergent, hard-surface cleaner, and car-care product containers. The operational boundary is that PCR core content above 40 wt% produces an observable reduction in top-load capacity and an increase in parison die-lip hang time; published data for the exact interaction between HDB0358 and mixed polyolefin PCR streams is limited, so incoming PCR must be screened for melt flow rate, ash content, and polyethylene/polypropylene contamination before line qualification.
The wall thickness distribution of a 30 L open-head drum blow moulded from HDB0358 is controlled by a 50-point parison programmer that adjusts die gap as a function of parison length; this is necessary because hydraulic pressure testing creates biaxial stress concentration at the bottom corner and the sidewall transition, where conventional fixed-die parison extrusion produces insufficient thickness. Compliance is governed by UN 1H2 design type approval for removable-head plastic drums, with hydraulic pressure, drop, leakproofness and stack tests performed in accordance with UN Model Regulations Chapter 6.1 and ISO 16101:2004. The formulation addition ratio is 100 wt% virgin HDB0358 for the drum body and lid seating area; clean in-house regrind is limited to 15 wt% for UN-certified production and only from the same HDB0358 drum line, with dust/fines removed by elutriation to prevent pinhole defects at the pinch-off line. Processing uses a single-station shuttle blow moulding machine with an accumulator head and a clamp force sufficient for the 30 L drum parting line; melt temperature is 185 °C to 205 °C, die temperature 190 °C to 205 °C, mould temperature 12 °C to 28 °C, and blow pressure 0.7 MPa to 0.8 MPa. If storage humidity exceeds 60% RH, pellets are pre-dried at 80 °C for 2 h to eliminate surface moisture pinholes. Terminal product types are 30 L and 60 L open-head drums and conical pails for solid and liquid industrial inputs, including powders, granular intermediates, and high-viscosity additives. The critical operational boundary is the pinch-off weld at the mould parting line: if the melt temperature at the pinch-off drops below 185 °C, the weld becomes notch-sensitive and fails the UN 1H2 drop sequence after conditioning at -18 °C; published data for the exact pinch-off weld strength of HDB0358 at these conditions is limited, so production lines must re-qualify after every programmer profile change.
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Braskem HDPE HDB0358 is a high-molecular-weight high-density polyethylene blow molding grade with a density of 0.958 g/cm³ when tested under ASTM D1505 and a melt flow rate of 0.35 g/10 min at 190 °C under a 2.16 kg load per ASTM D1238. The resin is formulated for extrusion blow molding of rigid containers where high melt strength, environmental stress crack resistance, and wall-thickness uniformity control process viability. In production-scale extrusion blow molding, the high molecular weight distribution produces a stable parison at die gaps between 1.2 mm and 2.5 mm, but published data for this specific configuration is limited. On single-station shuttle blow molders with 80 mm screw diameter and 24:1 L/D, die-head pressure is characteristically elevated relative to lower-molecular-weight HDPE grades. Because the melt flow rate is 0.35 g/10 min, the resin is not used for injection molding or thin-wall film casting where flow lengths exceed 200 mm at wall sections below 1.0 mm.
Melt temperature measured at the die head is maintained between 190 °C and 230 °C in typical HMW-HDPE blow molding. The upper bound should not exceed 240 °C, because extended residence above this threshold promotes chain scission and generates low-molecular-weight volatiles. The high viscosity of HDB0358 requires a grooved-feed extruder or a high-torque single-screw extruder with L/D between 24:1 and 30:1. Barrel zones are profiled from 180 °C near the feed throat to 220 °C at the metering section. When the parison is extruded downward under low shear, melt fracture is controlled by die-land temperature and surface shear stress; moisture levels above 0.05% by weight introduce splay in thin walls. The 0.05% figure derives from general HDPE conversion practice rather than the manufacturer’s datasheet.
Die-head pressure and torque limits should be monitored against the extruder drive rating. On a 90 mm grooved-feed extruder with 30:1 L/D running at screw speeds between 30 rpm and 60 rpm, the back pressure can approach the maximum continuous rating of the thrust bearing; published data for this specific configuration is limited. If the extruder is not designed for HMW-HDPE, the melt temperature may have to be increased to reduce viscosity, but this narrows the thermal window and can accelerate odor generation. The practical lower melt temperature is set by the appearance of unmelts or sharkskin on the parison surface, while the upper melt temperature is set by parison sag and discoloration.
One documented process conflict in HMW-HDPE blow molding is the inverse relationship between molecular weight and melt flow. HDB0358’s low melt flow rate increases head pressure and torque compared with HDPE grades at 0.7 g/10 min or above, but the same molecular weight reduces parison sag in large accumulator-head machines. Converters running 2 kg to 10 kg shot sizes on accumulator blow molders should monitor parison length at the moment of mold closing, because the high melt strength permits longer parison drop but can retain die swell that alters final wall-thickness distribution. Wall-thickness control in containers with handle pinch-offs is influenced by the parison swell ratio, which for this density range can exceed 1.6:1 depending on die gap and extruder speed. A die gap opening of 1.5 mm to 2.0 mm combined with blow pressure between 0.6 MPa and 0.9 MPa is used on shuttle machines; exact conditions require iterative parison profiling because the material does not exhibit the sharp shear-thinning of a bimodal pipe grade.
The absence of a high-shear-thinning additive package distinguishes HDB0358 from bimodal HDPE grades used in pipe extrusion, where lower head pressures at similar output are achieved through a tailored molecular weight distribution. Pre-drying is not normally required for unopened virgin resin, but storage at greater than 60% relative humidity can introduce surface moisture that appears as splay in thin walls. This operational boundary is most important when regrind content exceeds 15 wt%, because regrind absorbs atmospheric moisture more rapidly than virgin pellets.
Solid-state characterization under ASTM D638 places tensile yield strength near 28 MPa, with elongation at break greater than 800%. Flexural modulus under ASTM D790 is approximately 1,200 MPa. Environmental stress crack resistance under ASTM D1693, Condition A, 100% Igepal, exceeds 600 h; however, laboratory ESCR values should not be extrapolated to continuous contact with strong oxidizing acids or aromatic solvents.
| Property | Typical value | Test method |
| Melt flow rate at 190 °C/2.16 kg | 0.35 g/10 min | ASTM D1238 |
| Density | 0.958 g/cm³ | ASTM D1505 |
| Tensile yield strength | 28 MPa | ASTM D638 |
| Elongation at break | >800% | ASTM D638 |
| Flexural modulus | 1,200 MPa | ASTM D790 |
| Environmental stress crack resistance, F50 | >600 h | ASTM D1693 |
Values are representative and should not be used as specification limits; lot-specific values are provided on the certificate of analysis.
HDB0358 differs from injection molding HDPE grades principally in melt flow rate and molecular weight distribution. Injection grades with melt flow rates of 8 g/10 min to 20 g/10 min allow filling of thin-wall molds at injection pressures below 100 MPa; HDB0358 at 0.35 g/10 min would require excessive injection pressure and is not used in that process. Film-grade HDPE with density 0.952 g/cm³ and melt flow rate 0.7 g/10 min to 1.0 g/10 min produces lower film draw and higher dart impact in thin gauges; HDB0358 is optimized for parison integrity in thick-walled hollow parts rather than bubble stability in blown film.
Compared to a lower-density HDPE blow molding grade at 0.953 g/cm³, HDB0358 provides higher top-load strength and chemical resistance due to the 0.958 g/cm³ density, but at the cost of reduced low-temperature impact. In containers exposed to temperatures below -20 °C, the acceptance threshold for drop impact should be verified under ASTM D2463, because the higher-density polyethylene exhibits a ductile-to-brittle transition at a higher temperature than lower-density copolymers. Top-load strength is evaluated under ASTM D2659, and the density difference becomes measurable in the compression yield behavior of the finished container.
In recycling streams, HDB0358 is distinguishable from lower-density HDPE by its density sorting fraction. The 0.958 g/cm³ value places it in the same sink-float separation band as other rigid HDPE containers, not in the polypropylene band, which begins above 0.900 g/cm³ but below 0.940 g/cm³. This separation behavior matters in post-consumer recyclate streams where contamination levels above 5 wt% polypropylene can reduce stress crack resistance of the reclaimed material.
Blow molding processors comparing HDB0358 to a bimodal HDPE of similar density should not assume identical screw recovery behavior. The bimodal resin may show lower energy consumption in the extruder due to its structured molecular weight distribution, while HDB0358 may provide longer parison hold times in deep-draw tooling. The choice between these products should be based on container geometry and the required ESCR, not on density and melt flow rate alone.
When HDB0358 is evaluated as a drop-in replacement for a lower-density HDPE grade in rigid packaging, the processing and property changes must be quantified before mold transfer. The higher density increases the part weight at constant wall section by approximately 0.5% to 0.8% relative to a 0.952 g/cm³ resin; if lightweighting targets are fixed, the average wall thickness must be reduced accordingly. Blow molding trials on the same accumulator-head tooling typically require adjustment of parison programming points because swell and sag behavior differ from lower-viscosity grades. Processors should revalidate drop impact under ASTM D2463 and ESCR under ASTM D1693, rather than infer equivalence from density alone.
Regulatory compliance for HDB0358 as a high-density polyethylene homopolymer is assessed under FDA 21 CFR 177.1520, where olefin polymers may be used in contact with food subject to the density and extraction limitations of the regulation. The resin is also evaluated under EU 10/2011 for overall migration into food simulants; specific migration results must be confirmed by the converter for each finished article and food type. REACH registration under 1907/2006/EC applies at the polymer and monomer levels, and RoHS compliance under Directive 2011/65/EU requires that lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE are not intentionally added. The following matrix summarizes the applicable instruments.
| Regulation | Clause or method | Application boundary |
| FDA food contact | 21 CFR 177.1520(c) 3.1a | Olefin polymer, density 0.958 g/cm³ |
| EU food contact | EU 10/2011 | Overall migration must be checked in final article |
| REACH | 1907/2006/EC | Registration obligations for monomer and polymer |
| RoHS | Directive 2011/65/EU | No intentional addition of listed substances |
A documented limitation of HDB0358 is its upper continuous-use temperature. HDPE homopolymer is not suited for hot-fill above 75 °C to 85 °C without structural support or container design changes; published data for this specific configuration is limited. The resin should not be combined with strong oxidizing agents or strong mineral acids at elevated temperature. It is not recommended for pressurized gas service without a barrier layer, because the permeability of HDPE to nonpolar gases is higher than that of semi-crystalline polyamides. Incompatibility with long-term exposure to aromatic hydrocarbons and chlorinated solvents should be evaluated under ASTM D543, because swelling and loss of mechanical properties can occur even when short-term contact at ambient temperature shows no visual change. For lot-to-lot verification, the incoming resin should be tested for melt flow rate under ASTM D1238 and density under ASTM D1505, because these two values control melt viscosity and solid-state stiffness. A shift in melt flow rate from 0.35 g/10 min to 0.45 g/10 min may reduce head pressure and parison stability, while a density drift above 0.960 g/cm³ can increase brittleness in drop impact. Process adjustments should not be made solely on the basis of grade name; each lot should be checked against the certificate of analysis before large-scale container production.
