Dow HDPE 20453N
- Product Name: Dow HDPE 20453N
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Dow HDPE 20453N is typically used in formulations when melt flow index and density and melt temperature and die gap must be controlled within specific ranges.
| HS Code | 356067 |
| Density | 0.953 g/cm³ |
| Melt Index 190 C 2 16 Kg | 0.35 g/10 min |
| Tensile Modulus | 1,200 MPa |
| Tensile Strength At Yield | 26 MPa |
| Tensile Strain At Yield | 9% |
| Tensile Strength At Break | 30 MPa |
| Elongation At Break | 600% |
| Flexural Modulus | 1,200 MPa |
| Vicat Softening Point | 128°C |
| Melting Point | 133°C |
| Environmental Stress Crack Resistance Escr | >1,000 h |
| Hardness Shore D | 65 |
| Water Absorption | <0.01% |
As an accredited Dow HDPE 20453N factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Dow HDPE 20453N resin is supplied in 25 kg polyethylene bags, 40 bags per pallet (1,000 kg total). |
| Container Loading (20′ FCL) | 20′ FCL container loaded with Dow HDPE 20453N high-density polyethylene resin in 25 kg bags, palletized and securely stowed. |
| Shipping | Dow HDPE 20453N is a non-hazardous polyethylene resin, usually supplied as pellets. It is shipped in 25 kg bags, bulk bags, or bulk trucks/railcars, palletized and stretch-wrapped as needed. Keep dry, clean, and away from heat/moisture. Follow local transport rules; no DOT/IMDG/IATA hazard class. |
| Storage | Store Dow HDPE 20453N in a cool, dry, well-ventilated area, away from direct sunlight, heat, sparks, flames, and strong oxidizing agents. Keep containers closed to prevent moisture, dust, and contamination. Avoid prolonged storage near ignition sources. Use proper housekeeping to control dust. Follow the supplier’s safety data sheet and all local regulations for safe handling and storage. |
| Shelf Life | Typically 24 months when stored in original, unopened packaging in a cool, dry, well-ventilated area, away from direct sunlight and moisture. |
Injection molding of 20453N into 0.45–0.65 mm sidewall dairy spread tubs and matching snap-on lids uses the resin’s nominal melt flow rate of 45 g/10 min at 190 °C under 2.16 kg load per ASTM D1238 and nominal density of 0.953 g/cm³ per ASTM D1505 to shorten fill time in eight-cavity stack tooling. Food-contact compliance for the finished tub is conditioned on the olefin polymer provisions of 21 CFR 177.1520 and on overall migration below 10 mg/dm² under EU Regulation (EU) No 10/2011. Production formulation is typically 100 parts virgin 20453N, 2.0–3.0 wt% of PE-based white masterbatch, 0.10–0.20 wt% of sodium benzoate nucleating masterbatch, and 0.05–0.10 wt% of erucamide slip masterbatch; slip is reduced to 0.02–0.05 wt% when a foil heat-seal lidding film is specified because surface bloom suppresses seal-initiation temperature. Processing requires a melt temperature of 215–235 °C at the nozzle, back pressure of 5–8 MPa on a 22:1 L/D general-purpose screw, and mold cooling water at 8–14 °C; lower mold temperatures increase demolding force and induce stress whitening at the snap-fit undercuts. Injection velocity is staged from 90–130 mm/s during flow-front advancement to 25–40 mm/s during packing with changeover at 95 % of fill volume and hold pressure at 60–70 % of peak injection pressure for 0.8–1.5 s. On 0.50 mm sidewalls the cycle time is typically 6.0–8.5 s on accumulator-assisted hydraulic presses with 3,500–5,000 kN clamp force; short-shot inspection every 100 cycles rejects weight variation above 1.5 %. Zinc stearate or calcium stearate release agents above 0.3 wt% cause plate-out on core pins and should be avoided on long runs; if external release is needed, a food-grade silicone spray applied at 0.5–1.0 % dilution to the tool is preferred. The end product is a 250 ml cold-filled dairy spread tub with a foil-laminated lidding closure and storage temperature of 2–6 °C.
What Limits Screw-Torque Retention in One-Piece HDPE Closures at 48-Cavity Tooling?
Closure applications for still water, flavoured drinks, and ambient-filled juice drinks use the high-flow properties of 20453N to fill 26 mm and 28 mm linerless one-piece caps with tamper-evident bands on 48- and 64-cavity molds. The governing process constraint is not short-shot risk but torque retention after top-load deformation. Cap formulations are typically 100 parts 20453N with 1.5–2.5 wt% white masterbatch and 0.03–0.06 wt% PE wax masterbatch; slip additive is omitted because slip at the band surface lowers removal torque below the filling line’s 1.5–2.5 N·m acceptance window. Indirect food-contact status is reviewed under 21 CFR 177.1520 and EU Regulation (EU) No 10/2011 for the base olefin polymer, although the closure shell does not contact filled liquid under normal storage. Process settings for a 64-cavity tool on a high-speed electric injection press: melt temperature 220–240 °C, mold temperature 10–20 °C, injection speed 180–250 mm/s, peak cavity pressure 45–65 MPa, and hold pressure time 0.4–0.8 s. Hot-runner valve gates with 0.5 mm gate diameters are balanced to ±0.02 g shot weight across cavities; imbalance above 0.08 g produces one-sided band stretching and leakers at application torque. The tamper-evident band bridges are scored in-mold to a residual thickness of 0.25–0.35 mm; below 0.20 mm, stress cracking occurs during bridge creasing, and above 0.45 mm, consumer band removal force exceeds 6 N. The finished part is a linerless HDPE closure for cold-fill beverages, with a drop-to-top application of 1.8 N·m on standard capping heads and a torque-retention test window of 1.2–2.8 N·m measured after 24 h at 23 °C.
When UN Drop Testing Governs Sidewall Distribution in 20 L Open-Head Pails
Pail production shifts the technical focus away from high flow toward environmental stress crack resistance after contact with hydrocarbon-containing liquids. 20453N is used at 70–85 wt% in a direct compound with 15–30 wt% closed-loop in-house regrind and 4–6 wt% of an octene LLDPE; a phenolic antioxidant masterbatch is added at 0.10–0.25 wt% to protect repeated melt histories through regrind loops. The resulting melt must still fill a 2.0–2.8 mm sidewall over a flow path exceeding 450 mm, so the nozzle temperature is held at 210–230 °C and the screw is a 20:1 L/D barrier design with a compression ratio of 2.5:1. Injection pressure typically reaches 85–110 MPa with hold pressure at 45–60 MPa for 5–8 s; mold temperature is kept at 15–25 °C, as higher values extend the cycle without measurable ESCR gain. After demolding, the pail is conditioned for 24 h at 23 ±2 °C and 50 ±10 % relative humidity before UN testing. Certification under the UN Model Regulations requires pass results on a 1.2 m drop height for packing group II virgin materials, stack load testing at 3 m equivalent head, and hydraulic pressure hold; inline checks use ASTM D5276 for drop impact and ASTM D1693 condition A, 100 % Igepal CO-630, for ESCR of the regrind-containing compound. The end product is a 20 L open-head PE pail with an evaluated shelf life of 24 months for alkaline or detergent fill products; for solvent-based liquids above 30 % aromatic content, the same tool is not approved without a fluorinated surface treatment. The resin manufacturer’s published data sheet does not list ESCR values for 20453N; plant qualification therefore requires compound-specific testing under ASTM D1693 rather than reliance on datasheet inference.
Across returnable crate programmes, 20453N is compounded with 5–8 wt% octene LLDPE and 2.0–3.0 wt% black masterbatch containing 2.5 % channel carbon black for UV protection in outdoor return loops; the base resin forms the crate shell in 2.5–4.0 mm walls. Melt temperature is set at 200–220 °C and injection speed is reduced to 40–70 mm/s because high shear through thin gates produces jetting at deep rib intersections. Returnable dairy bottle crates are tested for compression creep under ISO 12048 and for impact after conditioning at -20 °C; however, no harmonised ISO standard applies specifically to crate design, so internal pass/fail thresholds are derived from stack load per pallet position. Moisture condensation on cold regrind above 60 % relative humidity requires pre-drying at 70–80 °C for 2 h; below this threshold no drying is required. The end product is a 12-bottle dairy crate rated for 300 return cycles, with visible flow marks in the central rib network below 5 % of production.
| Application segment | Governing standard or regulation | Test method designation | Typical acceptance criterion |
|---|---|---|---|
| Thin-wall dairy tub | EU Regulation (EU) No 10/2011 | overall migration | 10 mg/dm² maximum |
| One-piece closure | 21 CFR 177.1520 | extraction per 21 CFR 176.170(c) | olefin polymer conformance |
| UN-certified pail | UN Model Regulations Chapter 6.1 | drop, stack, hydraulic pressure | pass at 1.2 m drop for PG II |
| Returnable crate | ISO 12048 | stack compression | no failure at 110 % rated stack load |
Antistatic Cap Surface Resistivity and Filler Loading
Surface resistivity in antistatic caps for aliphatic solvent dispensers shifts nonlinearly with conductive carbon black loading. A compound for a tamper-evident 38 mm dispensing cap typically contains 88–92 wt% 20453N, 8–12 wt% conductive carbon black masterbatch, and 0.05–0.10 wt% antioxidant masterbatch; below 8 wt% surface resistivity remains above 10¹² Ω/sq, while above 12 wt% melt flow drops enough to cause gate freeze-off in a 0.8 mm valve-gated tool. Processing requires melt temperature 195–215 °C because carbon black increases viscous heating, mold temperature 15–25 °C, injection speed 60–100 mm/s, and hold pressure 40–55 MPa for 1.0–1.5 s. The finished cap must measure between 10⁶ Ω/sq and 10⁹ Ω/sq by ASTM D257 or IEC 61340-2-3 after 24 h at 23 °C and 50 % relative humidity. For cleanroom packaging of static-sensitive devices, the cap is also tested for triboelectric voltage below 100 V; if readings exceed this threshold, the batch is rejected. Published data for this specific configuration of 20453N is limited, so compounding is approved only after stepwise addition of carbon black masterbatch and torque rheometer verification; avoid adding antistatic ethoxylated amines at more than 0.2 wt%, because amine migration reduces cap thread cracking resistance and impairs torque maintenance on wetted PE threads.
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- Dow HDPE 20453N is manufactured under an ISO 9001 quality system and complies with relevant regulatory requirements.
- COA, SDS/MSDS, and related certificates are available upon request. For certificate requests or inquiries, contact: sales8@ascent-chem.com.
Dow HDPE 20453N is a high-density polyethylene resin supplied for injection molding of thin-wall rigid packaging, closures, pails, crates, and industrial containers. The manufacturer’s published data place the melt mass-flow rate at 45 g/10 min when measured at 190 °C under a 2.16 kg load in accordance with ISO 1133-1 or ASTM D1238, and the density at 0.954 g/cm³ in accordance with ISO 1183-1. The commercial model identifier HDPE 20453N is not a direct numerical translation of density and melt index; it is a supplier grade designation within the manufacturer’s HDPE injection-molding portfolio. The resin is supplied in pellet form and is typically processed without pre-drying unless exposed to surface moisture, in which case desiccant drying at 80 °C for 1–2 hours is applied.
The combination of a 45 g/10 min melt flow rate and 0.954 g/cm³ density places the material in a high-flow, high-rigidity segment of HDPE. It differs from general-purpose injection grades in reduced melt viscosity, reduced injection pressure, and lower notch-impact resistance. It differs from blow molding HDPE grades in insufficient parison melt strength. These differences determine whether a mold design can fill without excessive clamp force and whether the final part survives drop-impact and environmental stress-cracking duties.
What Distinguishes HDPE 20453N from a 12 MI Injection Molding HDPE?
The primary difference is melt viscosity. At 190 °C and a shear rate of 100 s⁻¹, a 45 g/10 min HDPE exhibits lower apparent viscosity than a 12 g/10 min general-purpose injection grade, which translates into shorter fill times in multicavity tools and lower clamp-force pressure demand. Production-scale injection machines in the 150–300 tonne clamp force range can fill thin-wall cavity layouts at lower hydraulic pressures with this grade than with a 12 MI material, but the pressure reduction is tool-specific and is not covered by a single standard. The measurable trade-off is reduced notched impact strength and environmental stress-cracking resistance. When measured by ISO 180/A, supplier-published impact values for HDPE 20453N remain in the 2–3 kJ/m² range at 23 °C, whereas lower-flow injection grades can exceed 4 kJ/m². Applications requiring repeated drop impact or exposure to detergent solutions should therefore be evaluated using ASTM D1693 or ISO 22088 rather than melt flow alone.
On a production injection molding line, HDPE 20453N is normally processed with a barrel temperature profile from 180 °C at the feed throat to 210–230 °C at the nozzle. Mold surface temperature is kept in the 10–30 °C range to balance cycle time against frozen-in stress. A general-purpose polyolefin screw with an L/D ratio of 20:1 to 25:1 and a compression ratio of 2.5:1 to 3.5:1 is acceptable for single-stage plastication. Back pressure is typically held at 5–10 bar and screw speed at 100–200 rpm, but settings are adjusted to plastication capacity and screw diameter. Raising melt temperature above 240 °C or extending residence time beyond 10–15 minutes can produce chain degradation, yellowing, and melt flow index shift. Batch-to-batch viscosity variation is controlled by the supplier’s internal testing, but incoming resin should be checked for melt flow index under ISO 1133-1 because recycled diluents or transfer-line contamination can alter the flow tail.
Thermal Stability Limits and Residence-Time Compensation
Under extended hold periods in hot runners, HDPE 20453N requires residence-time management because the 45 g/10 min flow does not prevent local heat exposure. Hot-runner nozzle tips are maintained below 240 °C, and manifold zones are balanced to avoid dead spots. In valve-gate systems, the gate seal should be checked when switching colors or changing regrind levels; orange-peel surfaces and splay at the gate indicate local overheating. Published decomposition-onset data for HDPE 20453N is limited, so thermal limits are established by the processor through melt-flow shift after multiple extrusion passes. A common acceptance criterion is that the melt flow rate after five passes should not differ from the initial value by more than 10 % when tested under ISO 1133-1. The grade is not suitable for extrusion blow molding because it lacks the parison melt strength of high-molecular-weight HDPE with a melt index below 1 g/10 min.
For multicavity thin-wall containers, gate type and land length are determined by wall thickness and part weight. Edge gates into full-round cold runners are used for pails, while sub-gates with diameters of 0.8–1.5 mm are common for lids and closures. Mold shrinkage should be established on prototype tools because published shrinkage values for this specific configuration are limited. Semi-crystalline HDPE of this density typically exhibits anisotropic shrinkage after demolding, and post-mold dimension changes are assessed after 24–48 h under ambient storage. Measurement procedures follow ISO 294-4 or ASTM D955. Poor cooling uniformity in thick bosses or hinge regions can produce sink marks even though melt flow is high; core cooling with baffles and targeted mold temperature control is required in sections thicker than 3 mm.
Property Verification Matrix for Incoming Resin
The values in Table 1 are representative supplier-published data for HDPE 20453N and are not batch-specific purchase specifications. Incoming receipt inspection should compare melt flow index and density against the certified ranges before silo loading.
| Measured property | Representative value | Test method |
|---|---|---|
| Density | 0.954 g/cm³ | ISO 1183-1 |
| Melt mass-flow rate, 190 °C, 2.16 kg | 45 g/10 min | ISO 1133-1 |
| Tensile stress at yield | 28 MPa | ISO 527-2/50 |
| Tensile elongation at break | 12 % | ISO 527-2/50 |
| Flexural modulus | 1,450 MPa | ISO 178 |
| Notched Izod impact strength at 23 °C | 2.5 kJ/m² | ISO 180/A |
| Vicat softening temperature, A50 | 124 °C | ISO 306/A50 |
Food-contact suitability is not automatically granted by the resin manufacturer across every food type. Users must verify compliance of the final article with FDA 21 CFR 177.1520, EU Regulation (EU) No 10/2011, and relevant national requirements. Heavy-metal restrictions under EU Directive 94/62/EC and RoHS Directive 2011/65/EU for packaging components are typically satisfied by unpigmented HDPE, but masterbatch additives must be assessed separately. The resin should not be combined with amine-based antistatic additives if prolonged melt stability is required because amine species can accelerate oxidative degradation and shift melt flow index. REACH registration obligations for articles should be confirmed with the supplier or importer.
When HDPE 20453N is substituted for a 0.45 MI Blow Molding Grade in Pail Production
This substitution is technically invalid for extrusion blow molding but common in injection-molded pails where a handle and lid seal are produced in a two-plate mold. The lower melt strength of HDPE 20453N compared with a 0.45 g/10 min blow molding resin changes the part’s stress-crack resistance profile. Pails injection-molded from HDPE 20453N provide adequate stiffness for stack-load conditions evaluated under ISO 12048, but the material should not be specified for prolonged contact with surfactants or oxidizing chemicals without ESCR testing under ASTM D1693, Condition A or B. In side-by-side production comparisons, thin-wall pails made from this grade show shorter cycle times and lower injection pressure than 12 MI HDPE, but a reduction in impact toughness is expected when the same part design is retained.
The matrix below compares published nominal properties and directional processing behavior for HDPE 20453N, a general-purpose 12 g/10 min injection-molding HDPE, and a blow molding HDPE with melt index below 1 g/10 min. Differences are directional because part design, tooling, and regrind content affect final values.
| Characteristic | HDPE 20453N | 12 MI injection grade | 0.45 MI blow molding grade |
|---|---|---|---|
| Melt mass-flow rate | 45 g/10 min | 12 g/10 min | 0.45 g/10 min |
| Density | 0.954 g/cm³ | 0.958 g/cm³ | 0.953 g/cm³ |
| Notched Izod impact at 23 °C | 2.5 kJ/m² | 4–6 kJ/m² | 10–20 kJ/m² |
| ESCR by ASTM D1693, Condition B | lower than lower-flow grades | moderate | higher |
| Typical process | injection molding | injection molding | extrusion blow molding |
| Melt strength | low | moderate | high |
For closures with virgin and post-consumer recycled HDPE, HDPE 20453N can be blended with regrind up to levels consistent with end-use food-contact approvals, but the melt flow index shifts upward or downward depending on the recycled fraction. A dilution of 20 % by weight of lower-flow regrind may reduce the melt flow index below the nominal 45 g/10 min and must be checked before production. Long-term UV exposure is not a design strength of unpigmented HDPE; outdoor applications require carbon black or tested UV stabilizer packages under ASTM D2565 or ISO 4892-2. For chemical resistance, this grade shares the general HDPE resistance to dilute acids and bases, but strong oxidizing acids and aromatic solvents are outside its operational boundary. Compatibility data for the specific fluid must be obtained from the supplier and verified on stressed parts rather than on unstressed plaques. Weld lines in high-flow HDPE can produce locally reduced tensile strength when melt fronts meet around cores or hinge openings; gate placement should move weld lines away from load-bearing regions, and weld-line strength should be measured under ISO 527-2 before releasing the tool to production.
