Dow HDPE IP-41
- Product Name: Dow HDPE IP-41
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Dow HDPE IP-41 is typically used in formulations when melt flow rate and processing temperature must be controlled within specific ranges.
| HS Code | 404687 |
| Density | 0.941 g/cm³ |
| Melt Index 190 C 2 16 Kg | 4.0 g/10 min |
| Tensile Yield Strength | 24.1 MPa |
| Tensile Break Strength | 28.3 MPa |
| Elongation At Break | 500% |
| Flexural Modulus | 1100 MPa |
| Notched Izod Impact Strength | 53 J/m |
| Hardness Shore D | 60 |
| Vicat Softening Point | 124 °C |
| Melting Point | 131 °C |
| Deflection Temperature At 0 46 Mpa | 71 °C |
| Environmental Stress Crack Resistance | 1000 h |
As an accredited Dow HDPE IP-41 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Dow HDPE IP-41 is typically supplied in 25 kg polyethylene bags, 40 bags per pallet (1,000 kg total). |
| Container Loading (20′ FCL) | Loading a 20′ FCL with palletized 25 kg bags of non-hazardous Dow HDPE IP-41, stretch-wrapped and secured for export. |
| Shipping | Dow HDPE IP-41 is a non-hazardous high-density polyethylene resin. It is typically shipped in 25 kg polyethylene bags on stretch-wrapped pallets, or in bulk trucks/railcars. Store in a cool, dry, ventilated area away from direct sunlight, heat, and ignition sources. Follow standard polymer handling practices. |
| Storage | Store Dow HDPE IP-41 in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, flames, and incompatible substances. Keep original bags or containers tightly sealed, palletized, and off the floor to prevent moisture and contamination. Avoid prolonged UV exposure and physical damage. Observe safe stacking limits and use first-in, first-out stock rotation. Follow the manufacturer’s SDS and local regulations. |
| Shelf Life | Shelf life is 2 years when properly stored in a cool, dry area, away from direct sunlight and moisture. |
Dow HDPE IP-41 is characterized by a melt mass-flow rate of 10 g/10 min at 190 °C/2.16 kg under ISO 1133-1:2022 and a nominal density of 0.952 g/cm³ under ASTM D1505. In thin-wall dairy spread tubs and frozen dessert containers, the first production constraint is not the melt temperature but the ejection force on core surfaces after the frozen skin layer has formed. The grade is injected at melt temperatures from 210 °C to 240 °C, with mold wall temperatures held at 10–25 °C for sidewall thicknesses of 1.2–2.5 mm. The formulation is a tumbled mixture of 2–4 wt% titanium dioxide white masterbatch and 0.5–1.5 wt% erucamide slip/silica antiblock masterbatch, the slip package being required because demolding forces on thin-wall cores exceed ejection limits when no surface lubricant is present. Industry compliance is anchored to FDA 21 CFR 177.1520 for olefin polymers under Conditions of Use A through H, and to EU 10/2011 with an overall migration limit of 10 mg/dm² when tested with 3% acetic acid, 10% ethanol and food simulant D2. The downstream production process uses high-speed hydraulic injection molding machines with clamp force ranges of 250–400 t, screw L/D ratios of 20:1–24:1, and stack molds configured from 24+24 to 48+48 cavities; cycle times normally fall between 6 s and 15 s depending on wall stock. Terminal product types include round and rectangular tubs for margarine, dairy spreads, ice cream, sorbet and frozen dessert packaging. Published data for stack-mold shear rates at the gate for this specific IP-41 configuration is limited, but gate shear rates below 40,000 s⁻¹ are generally targeted to avoid melt fracture on thin-wall sidewalls.
What Limits Cycle Time on Hot-Runner Closure Mold Tools Running IP-41?
The injection molding of screw caps and tamper-evident bands from IP-41 is controlled by the non-Newtonian shear response of a narrow molecular weight distribution polyethylene. In high-cavitation tools with 0.6–1.2 mm valve-gate diameters and 48–96 cavities, the process is limited by pressure drop through the hot runner and by shear heating that can raise local melt temperature above 240 °C, causing color masterbatch degradation streaks and gate stringing. The closure formulation typically contains 1.5–3.0 wt% color masterbatch, 0.2–0.5 wt% hindered phenolic/phosphite antioxidant processing stabilizer, and 0.05–0.15 wt% acid scavenger; slip additives are deliberately excluded from carbonated soft drink closures because torque retention and tamper-evident bridge performance are compromised when the coefficient of friction falls below the fill-line specification. Compliance includes FDA 21 CFR 177.1520 and EU 10/2011 for contact with aqueous, acidic and fatty foods; for detergent and chemical closures, environmental stress crack resistance is evaluated under ASTM D1693 condition B, where failure below the specified F50 value excludes a lot from chemical packaging. The downstream production process uses high-speed injection molding machines with accumulator-assisted hydraulic units and hot-runner valve gate systems; holding pressure profiles are adjusted so that the gate freezes before the hold phase is terminated, with valve-gate temperature tolerance held within ±3 °C to avoid freeze-off or stringing. Terminal product types include carbonated soft drink closures, still water closures, aseptic dairy closures, and detergent closures when an ESCR-optimized masterbatch is employed. Pre-drying is not required for ambient storage below 60% RH, but surface condensation above that limit should be removed by drying at 80 °C for 1–2 h to prevent splay.
In open-head pail and small drum production, the primary processing defect is the junction between sidewall and base at the injection gate, where short-shot and sink-mark generation occurs when the holding pressure is released before the gate freezes. IP-41 is injected at melt temperatures of 200–230 °C into molds with wall sections of 2.5–5.0 mm, and the holding pressure is typically maintained at 40–70 bar hydraulic pressure until the gate area has cooled below the crystallization onset. The formulation for industrial pail production includes 1.5–3.0 wt% color masterbatch, 0.1–0.3 wt% UV stabilizer if the pail is used in outdoor storage, and 0.05–0.10 wt% antistatic masterbatch when dry powders are packed. Regulatory compliance for dangerous goods packaging follows UN 1H2 for removable-head plastics drums and pails, with testing under ADR/RID/IMDG for drop, leakproofness and stack loading. For food-contact pails, FDA 21 CFR 177.1520 and EU 10/2011 govern the migration of the base polymer and colorant package. The downstream production process runs on injection molding machines with clamp force capacities of 500–1,000 t for multi-cavity production of pails up to 15 L, and gate design often uses direct sprue gating into the base with a venting groove along the outer mold parting line. Terminal products include 5 L, 10 L and 15 L open-head pails for paints, coatings, food pastes and fine chemicals.
When IP-41 Replaces Impact Copolymer Polypropylene in Thin-Walled Housewares and Food Storage
The substitution of impact copolymer polypropylene with IP-41 in injection-molded housewares requires adjustment of mold temperature and gate geometry because the polyethylene has a lower solidification temperature and a different linear shrinkage pattern. In thin-walled storage containers with wall thickness of 1.5–3.0 mm, mold cavity dimensions are recalculated using a linear shrinkage value of 1.5–2.5%, compared with the 0.8–1.5% range typically used for polypropylene. The formulation consists of 2–4 wt% color or pearlescent masterbatch, 0.2–0.4 wt% processing stabilizer, and, where food storage is intended, only masterbatch components that meet the same food-contact status as the base resin. The production process is conventional injection molding with cold or semi-hot runner systems; mold temperature is kept between 10 °C and 30 °C to minimize warpage, and screw back-pressure is set at 5–10 bar to avoid colorant agglomeration without overheating the melt. Compliance for kitchen storage includes FDA 21 CFR 177.1520 and EU 10/2011. Terminal product types include food storage boxes, utility baskets, drawer organizers, and stackable household containers where the grade’s stiffness permits thinner walls than standard HDPE.
Returnable Logistics Crates and Cold-Chain Bulk Bins
Returnable logistics crates molded from IP-41 are typically produced with wall sections of 3–8 mm and must survive repeated fork lift and conveyor impacts at temperatures down to −20 °C. The impact resistance is evaluated under ISO 179-1/1eU or ASTM D256, and the finished crate performance is often audited against ISO 8611 for pallet-type loading and racking, where applicable. The mold compound for outdoor or cold-chain use consists of 2–4 wt% color masterbatch, 0.2–0.5 wt% UV stabilizer containing hindered amine light stabilizer and benzotriazole UV absorber, and 0.1–0.3 wt% antistatic agent when sensitive components are transported; black crates often contain 2–3 wt% carbon black masterbatch for UV opacity. The downstream production process employs medium-to-large injection molding machines with clamp force capacities from 800 t to 1,500 t, multiple direct sprue gates, and cooling circuits designed for solidification of thick ribs without internal hot spots; mold temperatures of 15–35 °C are maintained with turbulent water flow at Reynolds numbers above 10,000 in cooling channels. Because HDPE has a lower melt temperature than polypropylene, the risk of charred material at high screw recovery speeds is reduced, but extended residence time above 25 min at melt temperatures above 230 °C can produce yellowness and a loss of environmental stress crack resistance. Terminal products include dairy crates, bakery trays, agricultural field totes, cold-chain bulk bins and stackable retail delivery boxes.
Extraction testing for high-density polyethylene toy components under EN 71-3 focuses on the migration of nineteen elements, including lead, cadmium, mercury and arsenic, from accessible surfaces. For IP-41 used in toy structural components and educational articles, the formulation is limited to 1.5–2.5 wt% color masterbatch with heavy-metal-free pigments and 0.1–0.3 wt% processing stabilizer; no external slip additive is used in products that may be mouthed because the additive can migrate and alter the sensory profile. Compliance is assessed under EN 71-3 and ASTM F963-17, with additional mechanical safety testing under EN 71-1 for small parts and drop performance. The downstream production process is injection molding on 80–250 t clamp force machines with polished cavity surfaces and rounded internal corners to minimize stress concentration; weld lines are positioned away from high-tensile areas such as snap fingers and hinge points. Terminal product types include building blocks, puzzle trays, board game boxes, soft building panels and classroom sorting trays.
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- Dow HDPE IP-41 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 IP-41 is identified in industrial resin listings as a high-density polyethylene grade. The designation is a proprietary manufacturer code; it does not communicate melt flow rate, density, comonomer distribution, or additive stabilisation. In the absence of a publicly available technical data sheet for Dow HDPE IP-41, all numerical values used for tool design and production setup must be taken from a batch certificate or supplier specification. The material should not be substituted for another HDPE grade on the basis of trade-name similarity alone. Incoming inspection should verify melt mass-flow rate under ASTM D1238 Procedure A at 190 °C/2.16 kg, density under ASTM D792, and contamination on a 100-mesh screen pack when the resin is intended for high-speed injection moulding.
The classification system of ISO 1043-1 places the material in the PE-HD category, but the IP prefix is not defined in that standard. For a PE-HD material, density is typically between 0.945 g/cm³ and 0.965 g/cm³; however, this range is class-wide and must not be entered into a mould-filling simulation as an IP-41-certified value. Published data for this specific configuration are limited in currently accessible distributor and technical literature. Consequently, a robust qualification protocol is required before the resin is released for production.
Identity, Classification, and Documented Boundaries of Dow HDPE IP-41
Within the framework of ISO 17855-1, polyethylene materials are classified for processing route and key physical properties. A product reference such as Dow HDPE IP-41 is a commercial designation, not a specification. The complete material specification should include density, melt mass-flow rate, tensile yield stress, elongation at yield, flexural modulus, and notched impact strength. Density is measured by ISO 1183-1 or ASTM D792; melt flow rate is measured by ISO 1133-1 Method A at 190 °C/2.16 kg; tensile yield is measured by ISO 527-2 or ASTM D638-14. The specific values for Dow HDPE IP-41 are not currently available in open secondary sources, so these test methods identify the parameters that must be closed before production.
For regulatory use, the supplier must state whether the grade meets FDA 21 CFR 177.1520 for olefin polymers intended for direct or indirect food contact, and whether it complies with EU Regulation (EC) No 10/2011 on plastic food-contact materials. Restricted-substance status is addressed by RoHS Directive 2011/65/EU Annex II and by candidate-list screening under REACH Regulation (EC) No 1907/2006. These regulatory references are applicable to the PE-HD class but do not constitute a declaration of conformity for IP-41 unless confirmed on the batch certificate.
The designation IP does not indicate a specific comonomer type. High-density polyethylene may be a homopolymer or a copolymer with butene, hexene, or octene. The comonomer influences environmental stress crack resistance and dynamic failure behaviour. If IP-41 is a copolymer, it may exhibit improved slow crack growth resistance relative to a homopolymer, but that difference cannot be quantified without ASTM D1693 or ISO 22088-3 data.
For injection-moulded rigid packaging, materials-handling containers, and industrial pails, the main design inputs are tensile yield stress, flexural modulus, Charpy notched impact strength, and mould shrinkage. A candidate HDPE injection grade would normally be qualified against ISO 527-2, ISO 178, ISO 179-1, and ISO 294-4. If the IP-41 datasheet later confirms melt flow rate between 10 g/10 min and 30 g/10 min, the material could be considered for thin-wall containers with flow-length-to-thickness ratios above 100:1. The exact melt flow rate, however, is not published; therefore this application window must be verified.
High-density polyethylene mould shrinkage is class-wide tested under ISO 294-4 and is generally 1.5% to 3.0% for unfilled PE-HD. The actual shrinkage for IP-41 will depend on density, mould temperature, part thickness, and gate orientation. Anisotropic shrinkage can cause warpage in deep containers; tool trials with a prototype mould are the only dependable method to establish the compensation factor. No published shrinkage value for IP-41 has been located in open technical literature.
What Process Variables Govern the Melt Stability of IP-41 During Injection Moulding?
The general melt temperature range for PE-HD injection moulding is 200 °C to 260 °C. The lower boundary is set by crystallisation and poor melt homogeneity; the upper boundary is set by thermal-oxidative degradation. In practice, a barrel profile of 190 °C in the hopper zone, 220 °C to 230 °C in the centre zones, and 240 °C in the front zone is common for general-purpose HDPE. The nozzle is held 10 °C to 20 °C below the front zone to reduce drool. If IP-41 is a high-flow injection grade, the lower-viscosity melt may allow the front zone to be set toward the lower end of the range; however, no IP-41-specific processing window is published.
Injection pressure for thin-wall HDPE parts can reach 1000 bar to 1200 bar when the flow-length-to-thickness ratio exceeds 100:1. Holding pressure is normally 40% to 60% of peak injection pressure. A conventional single-stage screw with L/D ratio 20:1 to 24:1 and compression ratio 2.5:1 to 3.5:1 is used for most HDPE injection grades. Screw back pressure is kept at 5 bar to 15 bar to avoid overheating. The cushion is maintained at 3 mm to 6 mm to maintain a stable holding-phase pressure profile.
Melt residence time above 240 °C should be kept below 5 min. Longer residence times increase the risk of chain scission, gel formation, and yellowing. When a machine is changed over from polycarbonate, polyamide, or PVC, purging with a high-viscosity HDPE or a commercial purging compound is required because residual polar polymers can degrade and contaminate the melt. The purge should continue until the melt is free of black specks and the melt pressure is steady at the target screw speed.
Batch-to-batch variation in melt flow rate is a critical production-scale failure mode. A change of more than 10% from the qualified baseline can produce short shots in thin sections or flash in high-clamp-force areas. On high-speed packaging lines, this variation is amplified by fast cycle times and small gates. A control chart of incoming melt flow rate should be maintained for every lot.
HDPE is not hydrolytically sensitive, but surface moisture from cold-pellet condensation can create splay, silver streaks, and feed instability. If pellets have been stored outdoors or in unheated silos at relative humidity above 60%, predrying at 80 °C for 2 h may be needed. This is a general PE-HD handling precaution. For IP-41, the same practice applies unless the supplier certificate confirms low residual moisture.
When the Specification Sheet Lacks Numerical Melt Index Data
The absence of published melt flow rate data for Dow HDPE IP-41 means that process engineers should generate an internal rheological fingerprint. The melt mass-flow rate is measured on incoming pellets using ISO 1133-1 Method A at 190 °C/2.16 kg. A single point is not sufficient for predicting gate shear behaviour; capillary rheometry under ISO 11443 should be performed across the shear-rate range of 100 s⁻¹ to 5000 s⁻¹. The viscosity at 1000 s⁻¹ is more relevant to injection gate shear than the low-shear melt index. For a high-flow injection grade, the apparent viscosity at 1000 s⁻¹ may be below 300 Pa·s, but no IP-41-specific value is confirmed.
If the resin is intended to replace an existing HDPE grade, the substitution trial should compare spiral-flow length, part weight, tensile yield stress, and notched impact strength. A spiral-flow tool provides a direct measurement of fill capacity at fixed melt temperature and injection pressure. The new resin should match the flow length within 5% of the incumbent at identical conditions. Full mechanical testing should follow ISO 527-2 and ISO 179-1. The conversion is not complete until mould shrinkage is measured under ISO 294-4.
Molecular weight distribution can be compared by gel permeation chromatography or inferred from melt flow ratio. A broader MWD improves shear thinning and can improve processability in large parts; a narrower MWD gives more uniform shrink and faster stress relaxation. The public information needed to locate IP-41 within these subcategories is currently limited. Therefore the material must be classified by direct measurement rather than by designation.
Rheological and Mechanical Benchmarks for High-Density Polyethylene Copolymer Grades
The table below lists test methods used for qualifying a PE-HD resin. It is not a declaration that IP-41 meets any particular value; it is the verification matrix that should be completed from the batch certificate.
| Standard or regulation | Designated method or clause | Property or status |
|---|---|---|
| ISO 1183-1 | Density by immersion | PE-HD density |
| ASTM D1238 | Procedure A, 190 °C/2.16 kg | Melt mass-flow rate |
| ISO 1133-1 | Method A | Melt mass-flow rate |
| ASTM D638-14 | Type IV, 50 mm/min | Tensile yield stress |
| ISO 527-2 | Specimen 1A | Tensile modulus |
| ISO 179-1 | Notched Charpy | Impact strength |
| ASTM D1693 | Condition C | ESCR |
| FDA 21 CFR 177.1520 | Olefin polymers | Food-contact suitability |
| EU 10/2011 | Overall migration | Food-contact plastic |
| RoHS 2011/65/EU | Annex II | Restricted substances |
The position of Dow HDPE IP-41 relative to other HDPE products depends on the grade’s melt flow rate and density. A high-flow injection HDPE differs from a blow-moulding HDPE in its low melt strength, lower die swell, and shorter cycle time. Blow-moulding grades are typically in the melt flow range of 0.2 g/10 min to 1.0 g/10 min at 190 °C/2.16 kg, whereas injection grades are often 5 g/10 min to 30 g/10 min. These ranges are class-wide values and are not certified for IP-41. If IP-41 falls within the injection range, it differs from high-density polyethylene pipe and film grades in its lower melt strength and greater flowability.
The molecular architecture is another differentiator. Pipe grades for PE 80 and PE 100 applications use a bimodal molecular weight distribution to provide long-term hydrostatic strength and slow crack growth resistance. Injection grades may use a unimodal or moderately broad distribution; they are not designed for pressure piping hydrostatic requirements. ISO 4427 and ISO 12162 govern pressure pipe designations. HDPE film grades are formulated for high-stalk bubble stability and dart impact, tested by ASTM D1709; these are not interchangeable with an injection resin. Published data for IP-41 is too limited to assign it to any of these families without supplier confirmation.
The general HDPE family ranges in the following table are provided for comparison only; they do not certify Dow HDPE IP-41.
| HDPE family | Class-wide melt flow rate at 190 °C/2.16 kg | Class-wide density | Differentiation from IP-41 |
|---|---|---|---|
| Injection moulding | 5 g/10 min–30 g/10 min | 0.950 g/cm³–0.965 g/cm³ | IP-41 may belong here if the supplier confirms a high-flow injection designation; IP-41-specific melt flow rate is not public. |
| Blow moulding | 0.2 g/10 min–1.0 g/10 min | 0.945 g/cm³–0.960 g/cm³ | Higher die swell and melt strength than a typical injection grade. |
| Pipe | 0.15 g/10 min–0.7 g/10 min | 0.940 g/cm³–0.960 g/cm³ | Bimodal MWD for PE 80/PE 100; not interchangeable with an injection grade. |
| Film | 0.5 g/10 min–2.0 g/10 min | 0.940 g/cm³–0.955 g/cm³ | Formulated for bubble stability and dart impact; does not imply injection performance. |
For chemical-contact applications, the relevant failure mechanism is environmental stress cracking. ESCR is measured by ASTM D1693 or ISO 22088-3. The result is affected by density, comonomer content, molded-in stress, and temperature. A lower-density HDPE copolymer generally shows higher ESCR than a higher-density homopolymer but lower stiffness. The balance for IP-41 must be determined experimentally because no ESCR value for this grade is available in the public secondary literature. In stressed applications with wetting agents, alcohols, or surfactants, the design should follow ISO 22088-2 and include prototype stress tests. Any substitution of IP-41 into an existing stressed part should therefore be preceded by a prototype ESCR test under ASTM D1693 or ISO 22088-3, because the public technical data needed for direct comparison are currently limited.
