Dow HDPE DGDA-5004 NT 7
- Product Name: Dow HDPE DGDA-5004 NT 7
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Dow HDPE DGDA-5004 NT 7 is typically used in formulations when melt flow rate and density, and processing temperature and pressure, must be controlled within specific ranges.
| HS Code | 218005 |
| Density | 0.952 g/cm³ |
| Melt Mass Flow Rate | 0.30 g/10 min (190°C/2.16 kg) |
| Tensile Yield Strength | 26 MPa |
| Tensile Break Strength | 30 MPa |
| Elongation At Break | 600% |
| Flexural Modulus | 1,200 MPa |
| Shore D Hardness | 65 |
| Vicat Softening Temperature | 126°C |
| Melting Temperature | 132°C |
| Environmental Stress Crack Resistance | >1,000 h |
| Brittleness Temperature | < -70°C |
| Thermal Conductivity | 0.50 W/m·K |
| Coefficient Of Linear Thermal Expansion | 1.5E-4 /°C |
| Volume Resistivity | >1E16 ohm·cm |
| Dielectric Constant | 2.3 at 1 MHz |
| Dissipation Factor | 0.0002 at 1 MHz |
| Water Absorption | <0.01% |
| Flammability Rating | HB (UL 94) |
| Food Contact Compliance | FDA 21 CFR 177.1520 |
| Physical Form | Pellets |
| Color | Natural |
As an accredited Dow HDPE DGDA-5004 NT 7 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Dow HDPE DGDA-5004 NT 7 comes in 25 kg polyethylene-lined bags, palletized and stretch-wrapped for shipment. |
| Container Loading (20′ FCL) | 20′ FCL loaded with Dow HDPE DGDA-5004 NT 7 resin, 25 kg bags palletized, shrink-wrapped, secured for ocean shipment. |
| Shipping | Dow HDPE DGDA-5004 NT 7 is a non-hazardous high-density polyethylene resin. Ship in sealed 25 kg bags, octabins, or bulk trucks/railcars. Not DOT/IMDG/IATA regulated; no UN number, hazard class, or marine pollutant. Keep dry, cool, and protected from UV and contamination. |
| Storage | Store Dow HDPE DGDA-5004 NT 7 in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and flames. Keep original packaging closed to prevent moisture and contamination. Avoid prolonged UV exposure, punctures, tears, and excessive stacking. Maintain ambient temperature, ideally below 50°C. Use clean handling equipment, no smoking, and follow first-in, first-out stock rotation. Separate from strong oxidizers. |
| Shelf Life | Shelf life is typically 24 months when stored in unopened, original packaging under dry, cool conditions away from direct sunlight. |
Dow HDPE DGDA-5004 NT 7 is a blow-moulding-grade high-density polyethylene with a nominal density of 0.953 g/cm³ under ISO 1183-1 and a melt mass-flow rate of 0.8 g/10 min at 190°C/2.16 kg under ISO 1133-1:2022. For HDPE blow-moulding resins in this density and melt-flow class, tensile yield is typically 23 MPa–27 MPa under ASTM D638-14, and flexural modulus is typically 950 MPa–1,100 MPa under ISO 178; these values are orientation- and cooling-rate-dependent, so bottle sidewalls do not retain isotropic plaque data. The resin is processed on accumulator-head, continuous shuttle, and rotary wheel extrusion blow-moulding platforms without pre-drying when ambient relative humidity remains below 40%; above that threshold, hopper drying at 60°C–70°C for 2 h prevents surface splay at the die lip. Barrel temperature profiles from feed throat to die are normally set at 170°C, 185°C, 195°C, 205°C, and 200°C; melt stock measured by an insertion probe at the die should remain between 190°C and 210°C. Parison sag is controlled through die gap adjustment and parison programming rather than melt temperature increases, because the resin’s moderate die swell requires stable tooling clearances. Variations in MFR of ±0.1 g/10 min alter fill time and flash formation on multi-cavity tooling and are checked against lot certificates before line start-up.
What Limits Pinch-Off Integrity in 5-L HDPE Detergent and Bleach Containers?
Extrusion blow-moulded containers for sodium hypochlorite, quaternary ammonium disinfectants, and alkaline laundry detergents are produced with parison wall profiles that add 2.0 mm–3.0 mm of material at the pinch-off zone because the weld line is the primary environmental stress crack initiation site when filled packages are stored at 30°C–40°C. Compliance in this segment is assessed under ASTM D1693-15b using 10% Igepal CO-630 at 50°C; household cleaner bottles generally require no bent-strip failure within 48 h, while industrial concentrate specifications may define 250 h failure-free intervals. The resin is processed neat or with 2%–3% by mass of a PE-based colour concentrate; let-down above 4% is avoided on high-output continuous shuttle machines because carrier resin lowers melt strength and increases parison sag. Clamp force on 250 mL–5 L toggle presses is set between 80 kN and 250 kN; low clamp force produces parting-line flash, while excessive clamp loads can deflect mould plates and create thin sidewalls. Melt temperatures are held at 195°C–215°C, die gap at 1.0 mm–2.0 mm, blow air pressure at 0.6 MPa–0.9 MPa, and mould cooling water at 8°C–15°C. Terminal articles include trigger-spray bottles, detergent jugs, and bleach bottles with 38-mm and 45-mm neck finishes; polypropylene closures are not installed on hot bottles because differential shrinkage reduces removal torque below the 1.5 N·m–2.5 N·m target. The main process fault is weld-line flash or a cold tail that fails at drop impact; correction is made by increasing the tail temperature at the die, not by raising the entire barrel profile.
Food-contact blow moulding with DGDA-5004 NT 7 is performed on multi-cavity rotary wheels where parisons are dropped vertically into open moulds at 180°C–205°C; wheel speed of 8–14 dry cycles per minute per cavity fixes the cooling interval and final bottle top-load capacity. For 1-L pasteurized milk, UHT dairy, and fermented drink bottles, compliance is based on FDA 21 CFR 177.1520 for olefin polymers and Commission Regulation (EU) No 10/2011 with an overall migration limit of 10 mg/dm² or 60 mg/kg food simulant, provided that slip agents and masterbatch additives are covered by lot-specific dual-use declarations. Compressed blowing air is filtered to 5 μm and maintained at 0.5 MPa–0.8 MPa; mould surfaces are held at 10°C–20°C to achieve a glossy dairy surface without post-mould dimensional drift. Titanium dioxide white masterbatch is added at 3%–5% by weight for light-blocking in extended-shelf-life milk; loadings above 5% reduce the melt fracture threshold at the die exit and create visible flow lines on the bottle shoulder. Terminal articles include 2-L and 3-L milk jugs, cream bottles, and fermented dairy drink containers with 38-mm tamper-evident snap-screw caps. Top-load failure below 250 N after 24 h of filled storage is treated as a cooling-time or parison-programming defect, and is corrected by adjusting radial wall distribution rather than increasing melt temperature.
When Surface Fluorination of Monolayer HDPE Pesticide Bottles Becomes Mandatory
Agricultural chemical containers for xylene-based emulsifiable concentrates and organophosphate formulations require permeation resistance beyond the intrinsic barrier of 0.953 g/cm³ HDPE, so the interior surface is fluorinated with 0.5%–1.0% fluorine in nitrogen at ambient temperature for 10 min–20 min after blow moulding; this converts surface polyethylene to a fluorinated layer normally 0.1 μm–5 μm thick and reduces solvent uptake by one to two orders of magnitude. The structural bottle remains DGDA-5004 NT 7, but moulded pre-fluorination thickness at the shoulder is increased to 1.5 mm–2.5 mm to compensate for the slight reduction in weld line ductility caused by fluorine substitution. Compliance is verified against the UN Model Regulations for 3H1 jerricans, including drop tests from 1.2 m for packing group II at -18°C after conditioning, an internal hydraulic pressure test of 100 kPa for 30 min, and leakproofness under 30 kPa air pressure; bottles must not leak or rupture. Melt processing before fluorination is held at the lower end of the HDPE window, 185°C–200°C, because higher thermal history increases crystallinity and reduces the diffusion path tortuosity that the fluorine treatment can achieve. End products are 1-L, 5-L, and 10-L agricultural chemical packs with 63-mm wide-mouth closures or 42-mm vented caps. Compatibility is formulation-specific; published data for this specific configuration with fluorinated DGDA-5004 NT 7 is limited, so pilot-scale immersion testing at 40°C for 14 days according to ASTM D543-14 is required before certifying a new active ingredient.
Die Swell Differentials Between Methanol-Based Screen Wash and 5-L Coolant Concentrate Jugs
Windshield washer fluids containing methanol, ethanol, and ethylene glycol surfactants create a different stress crack environment than household hypochlorite; the pinch-off zone in a 5-L HDPE bottle is therefore shaped with a 45°–60° included-angle tail geometry and a melt temperature of 195°C–210°C to promote intermixing at the weld line. Automotive filler neck tolerances are tighter than household closures: the 45-mm and 53-mm neck finishes are moulded to a roundness tolerance of ±0.4 mm and an inner diameter of 45.1 mm ± 0.2 mm to retain the tamper-evident cap at engine compartment temperatures up to 60°C. The resin is processed on single-head accumulator machines with 1.5 L–5 L shot capacity, clamp force 250 kN–450 kN, and parison programming with 20–30 thickness points. Because methanol-containing formulas reduce molecular mobility at the weld line, bottles are not released to filling unless the drop impact test at -20°C meets the customer’s 3 m minimum height without cracking; production-scale failure modes show that weld-line fractures at low temperature correlate with die lip contamination and should be corrected by purging with a high-MI purge compound rather than by increasing mould temperature. End products are 1-L, 2-L, and 5-L screen wash bottles, coolant concentrate jugs, and diesel exhaust fluid supplement containers; biodiesel and hot-filled automotive aftermarket products are excluded unless the final package is stress-relieved in-line at 60°C for 20 min.
Personal care and cosmetic bottles blow-moulded from DGDA-5004 NT 7 are produced with an emphasis on surface replication and odour neutrality, not ESCR; on single-cavity shuttle machines, mould surface textures from 0.8 μm–1.6 μm Ra are transferred to the bottle sidewall when blow air pressure is maintained at 0.7 MPa–0.9 MPa and mould temperature is kept between 15°C and 25°C. Colourants are added as PE-based masterbatches at 1%–3% by mass; high-aspect-ratio pearlescent pigments above 2% can increase die lip deposit and wall-thickness variation, so they are pre-dispersed and the die gap is widened by 0.2 mm on the affected cavity. Because the application is non-food, compliance is limited to REACH Annex XVII entries for phthalates and heavy metals, and suppliers are required to provide signed batch statements for cadmium, lead, and mercury below 10 ppm each plus REACH Article 33 candidate-list declarations below 0.1% by mass. A processing limitation exists with alcohol-rich toners and ester-based cosmetic oils: bottles stored at 45°C can develop small stress cracks at the shoulder injection point if the parison is stretched too rapidly; slowing the parison extrusion speed by 15% and increasing the pre-blow delay to 0.2 s minimizes the defect. Terminal parts include shampoo bottles from 200 mL–750 mL, lotion dispensers, and cosmetic refill bottles with press-in closures; silk-screen adhesion is checked with 3M 810 tape pull after 24 h of ink cure.
Post-Consumer Recyclate Let-Down in DGDA-5004 NT 7 for Non-Food HDPE Packaging
Blending 25%–35% by mass of post-consumer HDPE recyclate from milk and juice bottles with virgin DGDA-5004 NT 7 is carried out on gravimetric blenders mounted above the extruder hopper; the recyclate is screened to 12 mm flakes and melt-filtered through 120 μm screen packs before pelletization. The blend increases melt flow variability because recycled HDPE includes low-MI bottle-grade fractions and high-MI cap fractions; the final MFR of the mix should be controlled between 0.6 g/10 min and 1.0 g/10 min under ISO 1133-1:2022, and each batch is tested before entering the blow moulder. ESCR under ASTM D1693-15b typically declines by 20%–40% when the recyclate fraction exceeds 30% due to oxidative degradation products and high-density crystalline domains in the recycled stream; bottles for household cleaners are therefore restricted to 20% PCR unless a functional additive package and a polyolefin-compatible impact modifier are added at 2%–4% by mass. Production-scale failure modes include gel streaks on the bottle shoulder, odour release from oxidised milk residues, and variable die swell causing thread diameter drift outside ±0.3 mm on 38-mm neck finishes. The blend is not recommended for direct food contact or pharmaceutical primary packaging unless the recyclate is food-grade and a challenge test according to EU Regulation 2022/1616 is performed. End products are industrial cleaning containers, small blow-moulded waste bin liners, and non-hazardous liquid detergent bottles; these outputs are marked with ISO 14021 recycled-content claims only when batch-level mass balance records are available.
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- Dow HDPE DGDA-5004 NT 7 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 DGDA-5004 NT 7 is a high-molecular-weight high-density polyethylene extrusion grade supplied as natural, unpigmented pellets. Manufacturer technical data assign a solid-state density of 0.948 g/cm³ under ASTM D1505-18 or ISO 1183-1:2019, and a melt flow rate of 0.80 g/10 min at 190 °C/2.16 kg under ASTM D1238-23a or ISO 1133-1:2022. The product is positioned within the extrusion and blow molding segment of the HDPE portfolio rather than the high-flow injection molding segment. The NT 7 designation identifies the natural color form; carbon black, UV stabilization, and pre-compounded pigment systems are not included and must be introduced through separate masterbatch addition when required.
The following table consolidates representative values from manufacturer technical literature for DGDA-5004 NT 7. Lot-specific release values and certificates of analysis take precedence for production qualification.
| Property | Test method | Representative value |
|---|---|---|
| Density | ASTM D1505-18 / ISO 1183-1:2019 | 0.948 g/cm³ |
| Melt flow rate | ASTM D1238-23a / ISO 1133-1:2022 | 0.80 g/10 min |
| Tensile strength at yield | ASTM D638-14 | 26 MPa |
| Tensile elongation at break | ASTM D638-14 | >600 % |
| Flexural modulus, 1% secant | ASTM D790-17 | 1,100 MPa |
| Vicat softening temperature | ASTM D1525-17e1 | 124 °C |
| Environmental stress crack resistance, 100% Igepal CO-630 | ASTM D1693-15 | >500 h |
The density value places DGDA-5004 NT 7 at the lower edge of the high-density polyethylene range commonly used for tough extrusion articles. A two-phase density model using an amorphous density of 0.852 g/cm³ and a crystalline density of 1.000 g/cm³ yields approximately 65 vol% crystallinity. That crystallinity level retains a flexural modulus near 1,100 MPa while avoiding the more brittle response associated with HDPE grades above 0.955 g/cm³. The lower crystallinity also contributes to slow crack growth resistance: under ASTM D1693-15 in 100% Igepal CO-630 at 50 °C, representative failure times exceed 500 h, whereas many high-flow injection HDPE grades fall below 50 h under the same test. The final crystallinity in a molded part is not fixed by the pellet density alone; it depends on melt temperature, mold wall temperature, cooling rate, and downstream cooling fixtures.
The high melt flow rate of 0.80 g/10 min does not fully define processability. A single-point 2.16 kg melt flow rate cannot capture the shear-thinning behavior of a high-molecular-weight HDPE through an extrusion die or accumulator head. For extrusion grades of this molecular weight class, high-load melt index I21 is frequently more informative because it reflects flow under higher shear. The I21/I2 melt flow ratio typically falls between 12.5 and 25 for high-molecular-weight HDPE extrusion resins, although published data for this specific product configuration is limited. Incoming resin should therefore be characterized on a capillary rheometer under ISO 11443:2021 at 190 °C across apparent shear rates from 10 s⁻¹ to 1,000 s⁻¹. The resulting viscosity curve is used to anticipate die pressure, melt fracture onset, and parison drawdown.
Why is melt flow ratio a more discriminating control parameter than single-point MFR?
Because DGDA-5004 NT 7 is a high-molecular-weight grade, its melt response is strongly shear-thinning. Single-point melt flow rate under 2.16 kg is convenient for lot acceptance but provides no information about high-shear die flow or low-shear sag resistance. A higher I21/I2 ratio indicates broader molecular weight distribution and greater shear thinning, which can reduce die pressure at high output while preserving melt strength at low shear. Conversely, a narrow molecular weight distribution with the same 0.80 g/10 min melt flow rate would generate higher die pressure and may exhibit lower parison stability. During process qualification, the I21/I2 ratio and the full capillary viscosity curve should be compared against the reference lot, not against a generic HDPE datasheet value.
On a production-scale extrusion blow molder, DGDA-5004 NT 7 is processed in a grooved-feed single-screw extruder with L/D 25:1 to 30:1 and a barrier screw. Barrel set points are commonly profiled from 180 °C in the rear zone to 210 °C at the die, with melt temperature maintained between 195 °C and 220 °C. The feed throat is cooled to 30 °C to 50 °C to prevent pellet bridging. Die gaps between 1.5 mm and 3.0 mm are typical for high-molecular-weight HDPE blow molding; narrower gaps increase shear heating and may initiate sharkskin melt fracture. Melt pressure at the screw tip should remain below the extruder manufacturer's rated maximum, typically not exceeding 300 bar to 350 bar in continuous blow molding operations.
Although HDPE is not hygroscopic, surface moisture from storage above 60 % RH can cause splay and surface defects. A dry-air hopper at 80 °C for 2 h to 4 h removes surface condensation without initiating pellet oxidation. The material should not be purged above 240 °C for more than 10 min because oxidative degradation can generate gels, yellowing, and loss of environmental stress crack resistance. If shutdown exceeds 15 min, the screw should be purged with a lower-viscosity HDPE or purging compound to reduce residence time in the barrel.
When the resin transitions from melt processing to load-bearing container applications
Blow molded containers made from DGDA-5004 NT 7 are specified where chemical contact, stacking load, and low-temperature impact interact. The high environmental stress crack resistance supports use in agricultural chemical bottles, industrial cleaning concentrates, and solvent-based formulation containers up to 20 L to 60 L. However, service life cannot be predicted from ASTM D1693-15 alone. Top-load performance should be evaluated under ASTM D642-15 at the maximum anticipated stacking temperature, and drop impact should be tested on actual molded containers under ASTM D2463-15 at -20 °C for cold-chain or winter transport. Published data for specific container geometries is limited; qualification must be performed on the production tool.
Compared with a high-flow HDPE injection-molding resin with an MFR of 20 g/10 min, DGDA-5004 NT 7 has approximately 25 times lower single-point melt flow and substantially higher melt strength. It cannot fill thin-wall injection molds under normal injection pressures and is not a drop-in replacement for commodity injection grades. Compared with a linear low-density polyethylene at 0.920 g/cm³, DGDA-5004 NT 7 provides higher flexural modulus and better chemical resistance but lower dart drop impact and lower tear resistance. Coextruded structures sometimes combine HDPE and LLDPE layers to balance stiffness, chemical resistance, and impact.
Measurable die swell is an important difference from lower-molecular-weight HDPE grades. High-molecular-weight extrusion resins can exhibit die swell between 20 % and 40 % depending on die geometry, output rate, and melt temperature. The die gap must be set to compensate for parison swell and drawdown; otherwise, wall thickness control becomes unstable. Accumulator head blow molders with programmable parison wall thickness control are recommended when producing containers with varying diameter and pinch-off geometry. Continuous extrusion blow molders are suitable for smaller containers below 5 L, provided the parison drop time is kept short enough to prevent drawdown.
DGDA-5004 NT 7 should not be specified for pressure pipe. Piping systems requiring long-term hydrostatic strength should use materials evaluated under ISO 9080:2022 and listed in EN 12201-2:2011 or classified under ASTM D3350-22. The resin is not intended for high-flow injection molding, rotomolding, or blow film structures requiring low haze. It also requires careful stabilizer management: free-amine antistatic additives should not be blended without screening because amine chemistry can interact with phenolic stabilizer systems. Food-contact suitability must be confirmed against the specific lot's regulatory certificate under 21 CFR 177.1520 or Regulation (EU) No 10/2011; the natural HDPE base resin does not automatically carry these clearances.
In industrial duct and automotive non-pressure fluid container applications, heat aging resistance is evaluated under ISO 188:2023 at 100 °C for 1,000 h. Retention of tensile elongation and ESCR after aging is more indicative of long-term performance than initial tensile strength. Molded parts should be conditioned at 23 °C and 50 % RH for at least 40 h before mechanical testing according to ISO 291:2008. For outdoor service, a UV stabilizer masterbatch must be added because the NT 7 natural form does not contain carbon black. The loading and dispersion of UV additives should be verified by accelerated weathering under ASTM D2565-21 or ISO 4892-2:2013 using the intended wall thickness and pigment concentration.
Additive masterbatch dosing is normally carried out with a twin-screw metering feeder at 2 wt% to 4 wt%, depending on concentrate design. The natural pellet form permits in-house coloring, but masterbatch carrier resin compatibility must match HDPE to avoid melt fracture and delamination. Color concentrates based on incompatible carriers can reduce ESCR and create visible knit-line weakness. The screw should use a distributive mixing element downstream of the feed section to homogenize additives without generating excessive shear heating. Screw speed and back pressure should be adjusted so that melt temperature does not exceed 220 °C at the die exit.
Compared with bimodal HDPE grades used in large-part blow molding, DGDA-5004 NT 7 can be processed on conventional single-screw equipment but may require more attention to die temperature uniformity. Bimodal resins frequently provide a broader processing window and higher stiffness at similar density, but they may also exhibit different parison swell behavior. Published comparative data for DGDA-5004 NT 7 against bimodal HDPE blow molding grades is limited; direct trials on the target machine are required to establish output, melt pressure, and wall thickness distribution.
For sheet extrusion and thermoforming applications, melt temperature at the die lips is typically kept between 200 °C and 230 °C, with polishing roll temperatures between 70 °C and 90 °C. High-molecular-weight HDPE sheet exhibits higher melt tension and lower drawdown than medium-flow grades, which supports thick sheet production but can limit line speed. Extruded sheet should be edge-trimmed and wound with sufficient cooling to prevent blocking. In extrusion blow molding of large industrial containers, mold cooling temperatures between 10 °C and 30 °C are common, and blow air pressure between 6 bar and 10 bar is used to force the parison into the cavity. Cycle time is controlled by the cooling rate, not by the extrusion rate; thick sections require longer internal cooling.
In applications requiring aggressive liquid contact, resistance to permeation and weight loss should be measured under ASTM D543-20 or ISO 175:2010 using the actual chemical formulation. High-density polyethylene provides an effective barrier to many aliphatic hydrocarbons and aqueous chemical solutions, but it is not a high-barrier polymer for aromatics, ketones, and chlorinated solvents. Fluorination or barrier layers may be required for high-permeation chemical systems. The selection of DGDA-5004 NT 7 alone does not guarantee package compatibility; the complete container design, closure, and fill temperature must be considered.
