Dow HDPE DMDC-6400 NT 7
- Product Name: Dow HDPE DMDC-6400 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 DMDC-6400 NT 7 is typically used in formulations when density and melt flow rate and processing temperatures and pressures must be controlled within specific ranges.
| HS Code | 826017 |
| Density | 0.960 g/cm³ |
| Melt Flow Rate 190 C 2 16 Kg | 0.35 g/10 min |
| High Load Melt Flow Rate 190 C 21 6 Kg | 30 g/10 min |
| Tensile Strength At Yield | 29 MPa |
| Tensile Strength At Break | 30 MPa |
| Elongation At Break | 600% |
| Flexural Modulus | 1200 MPa |
| Vicat Softening Point | 127 °C |
| Melting Point | 132 °C |
| Brittleness Temperature | -70 °C |
| Environmental Stress Crack Resistance Escr | >1000 h |
| Hardness Shore D | 65 |
| Thermal Conductivity | 0.35 W/m·K |
| Coefficient Of Linear Thermal Expansion | 1.2E-4 cm/cm/°C |
| Deflection Temperature At 0 45 Mpa | 75 °C |
As an accredited Dow HDPE DMDC-6400 NT 7 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Dow HDPE DMDC-6400 NT 7 is packaged in 25 kg polyethylene bags, palletized, with 1,000 kg bulk bag options. |
| Container Loading (20′ FCL) | Dow HDPE DMDC-6400 NT 7 palletized in 25 kg bags, securely loaded into a 20′ FCL container for ocean transport. |
| Shipping | Dow HDPE DMDC-6400 NT 7 is a non-hazardous high-density polyethylene resin supplied as pellets. It is not classified as dangerous goods for transport and requires no UN number, hazard class, or special labels. Ship in sealed bags, boxes, or bulk containers, keeping material dry, clean, and away from excessive heat. |
| Storage | Store Dow HDPE DMDC-6400 NT 7 in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, ignition sources, and strong oxidizers. Keep original containers sealed, clean, and clearly labeled. Protect from moisture, dust, and contamination. Use pallets, avoid excessive stacking, and practice first-in, first-out inventory. Ground equipment where dust may accumulate. Follow local regulations and the manufacturer’s SDS. |
| Shelf Life | Shelf life: typically 24 months from manufacture when stored unopened, dry, below 50°C, away from direct sunlight and moisture. |
In agrochemical packaging lines operating continuous shuttle blow moulding equipment with 24:1–30:1 L/D single-screw extruders, DMDC-6400 NT 7 is pre-dried only when hopper inlet temperatures fall below dew point, and barrel set points are maintained between 180 °C and 210 °C. UN certification for dangerous goods packaging is governed by the UN Model Regulations Chapter 6.1 performance tests, specifically drop, stack, and hydraulic internal pressure protocols under UN 6.1.5, with ADR/RID/IMDG transport compliance confirmed for packing group II/III liquids; environmental stress crack resistance is bench tested per ASTM D1693-15 Condition B in 100% Igepal, while density and melt flow are controlled per ASTM D792-20 and ASTM D1238-20 at nominal 0.964 g/cm³ and 0.6 g/10 min (190 °C/2.16 kg). The batch formulation for a 25 L tight-head jerrican consists of 96–98 wt% DMDC-6400 NT 7, 2–4 wt% UV stabilizer masterbatch in an HDPE carrier, and 1–2 wt% custom color concentrate; closed-loop regrind is introduced at ≤20 wt% only after retained specimens exhibit no ESCR failure below 300 h. Production is performed on 80 mm 25:1 L/D accumulator machines with 10–20 point parison programming, wall thickness set points between 1.8 mm and 3.5 mm, clamp force of 600–1,200 kN, blow air at 0.7–0.9 MPa, and mould cooling at 10–25 °C; cycle time for a 25 L container typically falls between 55 s and 75 s. Terminal products include 5 L, 10 L, 20 L, and 25 L UN-rated jerricans used for pesticide, herbicide, industrial fluid, and solvent distribution.
What Limits Parison Programming Accuracy in Automotive Coolant Reservoir Blow Moulding?
Parison programming accuracy in automotive coolant reservoir blow moulding is constrained primarily by die head temperature drift, screw speed variation, and accumulator fill pressure oscillations; closed-loop PID control on modern 80–120 mm extruders maintains die lip melt temperature within ±2 °C and screw speed within ±2 min⁻¹. Materials used in coolant reservoir manufacturing are validated to ISO 16750-3:2012 for vibration and thermal cycling, SAE J1684 for coolant resistance, and FMVSS 302 for horizontal burn rate; REACH Annex XVII and ELV Directive 2000/53/EC documentation are required for EU-bound reservoirs. The standard formulation contains 90–95 wt% DMDC-6400 NT 7, 2–4 wt% carbon black masterbatch, and 3–6 wt% in-house clean regrind derived from deflashed tops, tails, and purgings; reincorporation is paused if oxidation induction time measured per ASTM D3895-19 falls below 20 min at 210 °C. The downstream process uses an accumulator head blow moulding line with 10–20 point parison programmer, die gap 1.5–3.0 mm, melt temperature 200–220 °C, mould cooling 21–25 °C, and clamp force 800–1,800 kN; internal weld-line thickness at the pinch-off is ultrasonically screened against a 1.5 mm minimum. Terminal products are windshield washer reservoirs, coolant recovery bottles, and heavy-duty truck hydraulic fluid reservoirs.
Household Chemical Bottle Production with Regrind Reincorporation
Household chemical bottle production with regrind reincorporation is subject to packaging compatibility requirements under the EU Detergent Regulation (EC) No 648/2004, REACH Annex XVII restrictions, and CLP Regulation (EC) No 1272/2008 for hazardous mixtures; stress crack resistance against bleach and surfactant solutions is measured per ASTM D1693-15 Condition C in 10% Igepal, while impact toughness is verified by ASTM D256-23 at 23 °C. In non-food formulations, DMDC-6400 NT 7 is blended at 92–98 wt% with 1–3 wt% color masterbatch, 0.5–1.5 wt% PE-based processing aid masterbatch, and 15–30 wt% washed post-industrial or post-consumer HDPE regrind; the regrind fraction is reduced to ≤20 wt% when sieve analysis shows particle content below 10 mesh exceeding 5 wt%, because fines accumulation destabilizes extrusion pressure. Downstream processing on high-speed shuttle or rotary blow moulders uses 60–75 mm single-screw extruders with 24:1–28:1 L/D, barrel set points from 175 °C to 210 °C, die head set points from 185 °C to 205 °C, and gravimetric dosing of masterbatch at a letdown accuracy of ±0.2 wt%; moisture is controlled below 0.02% by dry-air conveying. Terminal bottles span 250 mL to 5 L for bleach, multi-purpose cleaners, fabric softeners, and liquid hand soap.
For dry food and condiment packaging lines operating under EU 10/2011/EC and FDA 21 CFR 177.1520(c) 3.1a, DMDC-6400 NT 7 is used only in the unmodified natural state or with pigment masterbatches whose constituents are cleared in the relevant positive lists; overall migration is verified at 10 mg/dm² under the EU 10/2011/EC test conditions, and China GB 4806.6-2016 plus Japan MHLW Notification No. 370 are applied where regional distribution requires. The food-contact formulation is set at 100 wt% virgin DMDC-6400 NT 7; when coloration cannot be avoided, 1–2 wt% food-grade masterbatch is added, and no post-consumer regrind, recycled content, slip agent, or external lubricant is permitted unless the processor holds a plastic functional barrier opinion or equivalent national clearance. Process lines use dedicated blow moulding cells with stainless steel pellet-contact surfaces, single-screw extruders with polished 24:1–28:1 L/D barrels, barrel temperatures 180 °C to 210 °C, die head set points 190 °C to 205 °C, and mould cooling at 10–20 °C; cold-pellet condensation rather than absorbed moisture is controlled by keeping the hopper environment below 60% RH, with desiccant drying at 60–80 °C for 2–3 h only when pellets are transferred from outdoor silos in humid climates. Terminal products include 500 mL to 2 L dry food canisters, condiment bottles, and edible oil containers where oxygen barrier requirements are addressed by closure and fill-line practices rather than the HDPE monolayer itself.
When Outdoor Storage Tanks Require Carbon Black Dispersion Stability
Carbon black dispersion stability in outdoor storage tank parison walls becomes a critical process parameter when blow moulding parts with nominal wall thicknesses above 3.0 mm, because agglomerates act as stress concentrators during freeze-thaw cycling and UV exposure. Compliance for outdoor tanks intended for potable water contact is tested to NSF/ANSI 61 or national transpositions of the EU Drinking Water Directive (EU) 2020/2184; non-potable agricultural and industrial tanks are qualified under ISO 4892-2:2013 for UVA-340 filtered weathering and ISO 179-1:2023 Charpy impact at −30 °C. The compound is formulated with 96–98 wt% DMDC-6400 NT 7 and 2–4 wt% carbon black masterbatch, yielding 2.0–2.5 wt% carbon black in the final wall; dispersion quality is assessed on microtomed sections per ISO 18553:2002, and the masterbatch is dried at 70 °C for 2 h if opened in 70% RH conditions for more than 24 h. Production requires an accumulator head blow moulding line with a low-shear screw equipped with a Maddock mixing section, melt temperatures of 190 °C to 210 °C, die head set points of 195 °C to 215 °C, wall thickness set points from 3.0 mm to 6.0 mm, and mould cooling at 15–25 °C; continuous parison length measurement is used to reject preforms outside ±5 mm. Terminal products are 50 L to 100 L outdoor liquid storage tanks, agricultural sprayer tanks, and rainwater harvesting cisterns.
Across Cosmetic and Personal Care Containers, Surface Defects and Torque Retention Drive Mould Qualification
Surface defects in cosmetic and personal care container blow moulding are evaluated under 2.5× magnification with a 45° incident light source, and torque retention on screw-thread finishes is quantified using a digital torque meter at 0.12–0.18 N·m for 500 mL bottles. The relevant packaging compliance framework for cosmetic containers is EU Cosmetic Regulation (EC) No 1223/2009 for product-contact safety, supplemented by REACH Annex XVII and California Proposition 65 declarations for the finished packaging; if the container is marketed for food-adjacent dry storage, FDA 21 CFR 177.1520(c) 3.1a is incorporated into the resin certificate. Formulation uses 95–99 wt% DMDC-6400 NT 7 with 1–3 wt% cosmetic-grade masterbatch, and a fluoropolymer processing aid at 0.2–0.5 wt% is permitted only on lines where shear-induced melt fracture is documented; no external waxes are used because they migrate to the surface and reduce print adhesion. Downstream blow moulding equipment consists of 50–70 mm single-screw extruders with 22:1–28:1 L/D, polished die heads, melt temperatures of 185 °C to 205 °C, mould surface polish maintained at SPI A2 or better, and mould cooling at 10–15 °C; cycle times for 500 mL containers range from 12 s to 20 s. Terminal products include 50 mL to 1 L bottles for shampoos, lotions, conditioners, and cosmetic creams.
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- Dow HDPE DMDC-6400 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 DMDC-6400 NT 7 is a high-density polyethylene extrusion blow molding resin supplied as natural-color pellets. The grade is specified for rigid container applications in which parison melt strength, high-density load resistance, and controlled process rheology are primary engineering requirements. Its published density of 0.964 g/cm³ under ASTM D792-20 and high-load melt flow rate of 7.0 g/10 min under ASTM D1238-20 at 190°C with 21.6 kg mass differentiate it from low-density HDPE film grades and from lower-molecular-weight injection-molding HDPE resins. Commercial processing is concentrated in shuttle and continuous blow molding cells producing containers for household chemicals, detergent concentrates, automotive fluids, and industrial liquid packaging. The material is not intended for thin-wall injection molding or for films requiring high draw-down. Regulatory status must be confirmed by the manufacturer for the intended use; the starting references include FDA 21 CFR 177.1520 for food-contact olefin polymers and EU Regulation (EU) No 10/2011 for plastic materials intended for food contact. Lot-specific property values are documented in the certificate of analysis and should be used for production qualification.
What Limits Parison Hang Time in High-Temperature Blow Molding of DMDC-6400 NT 7?
On shuttle blow molding machines with grooved-feed extruders of 60–80 mm screw diameter and L/D 24:1–30:1, parison hang time is governed by melt temperature, die gap, and the resin’s molecular weight distribution. A die-head melt temperature of 190–210°C is typical for this grade; above 220°C, low-frequency parison sag becomes more evident on tooling with shot weights above 2.5 kg. Back pressure in the range of 10–20 bar is used on forced-feed grooved bushings to narrow melt temperature oscillation. Published data for this specific configuration is limited, and maximum hang time is normally established through incremental die gap adjustment on the target mold. The high-load melt flow rate of 7.0 g/10 min indicates a higher melt viscosity than fractional-melt HDPE drum grades, so sag is lower at equal melt temperature, but cooling time may increase because wall thickness is controlled by mold cooling rather than melt temperature alone.
Reported physical properties for DMDC-6400 NT 7 are typically measured with the methods shown in the following test-method matrix. Density is reported as 0.964 g/cm³ under ASTM D792-20; high-load melt flow rate is 7.0 g/10 min under ASTM D1238-20. Secant flexural modulus and tensile yield strength are assessed using ASTM D790-17 and ASTM D638-14, respectively. Environmental stress crack resistance is characterized under ASTM D1693-15 with 100% Igepal CO-630 at 50°C. Vicat softening temperature is determined under ASTM D1525-17e1. The typical values for this density class place flexural modulus in the range of 1,400–1,600 MPa and Vicat softening temperature near 125–130°C, but the current Dow technical data sheet is the controlling document for nominal specification limits. Published data for this specific configuration outside the manufacturer’s current revision is limited, so molded plaque testing is required for structural design.
| Property | Method | Reported condition |
|---|---|---|
| Density | ASTM D792-20 | 23°C |
| High-load melt flow rate | ASTM D1238-20 | 190°C, 21.6 kg |
| Tensile yield strength | ASTM D638-14 | Type IV specimen, 50 mm/min |
| Flexural modulus | ASTM D790-17 | 2% secant, 1.3 mm/min |
| Environmental stress crack resistance | ASTM D1693-15 | Condition B, 100% Igepal, 50°C |
| Vicat softening temperature | ASTM D1525-17e1 | Loading 10 N, Rate A |
When the Same Container Requires High Top-Load Stiffness and Caustic ESCR
Selection of DMDC-6400 NT 7 over a lower-density, high-ESCR HDPE copolymer involves a measurable trade-off. The 0.964 g/cm³ density produces higher panel and top-load stiffness for a given wall section than 0.949–0.955 g/cm³ blow molding copolymers, but environmental stress crack resistance decreases as density increases. In concentrated surfactant or caustic fill products, ESCR failure time under ASTM D1693-15 Condition B may be shorter than for a 0.953 g/cm³ copolymer. When specifications require both high-density stiffness and extended stress crack resistance, bottle qualification must include filled-product testing, because ESCR is influenced by molded-in stress, wall thickness distribution, and closure torque. The difference from lower-flow HDPE drum grades is also significant: DMDC-6400 NT 7 processes with shorter cycle time on smaller containers but is not optimized for large-part accumulators or multi-layer coextrusion structures requiring long parison hang stability.
In continuous shuttle blow molding cells with 60–80 mm grooved-feed extruders, barrel zone temperatures are commonly set in the 170–210°C range, with the die head maintained at 190–210°C. Screw speed and back pressure are adjusted to maintain melt homogeneity; typical back pressure of 10–20 bar is used on machines with forced-feed grooved bushings. Mold temperature for HDPE is often held at 10–30°C to control cooling shrinkage, though cycle time is dominated by part weight and wall thickness. Blow air pressure is typically 0.6–0.8 MPa, but line trials must establish the minimum pressure for full cavity definition. At storage humidity above 60% RH, visible surface moisture on pellets can produce surface defects; a hopper dryer at 60–70°C for 2 h is sufficient when condensation is observed. Melt temperature variation across the die should be controlled within ±5°C to prevent parison length variability and wall thickness drift.
Comparative melt flow data separate DMDC-6400 NT 7 from injection-molding HDPE. Injection grades typically show a melt flow rate under 2.16 kg of 8–20 g/10 min, while this blow molding grade is expected to fall below 1 g/10 min under the same load. The elevated molecular weight is necessary for parison melt strength and die swell control, but it also rules out thin-wall injection molding. Differences from lower-melt-index blow molding grades include reduced hydraulic melt pressure and improved flow in smaller die-head tooling, but a corresponding reduction in parison hang time for very large containers. Tooling compensation for die swell is part-specific; for HDPE of this molecular class, die swell ratios observed on divergent tooling commonly fall between 1.4 and 1.8, and actual die land length must be adjusted after initial molding trials.
Vicat Softening Point and the Onset of Container Panel Deformation
Vicat softening data under ASTM D1525-17e1 provide a comparative indicator of heat resistance in container service. For HDPE grades near 0.964 g/cm³, Vicat softening temperature is typically reported in the region of 125–130°C, which is higher than lower-density polyethylene grades but below polypropylene. This means DMDC-6400 NT 7 can be used for containers exposed to warm filling at moderate temperatures, but continuous service above 60–70°C may produce panel deformation under top load. Actual container performance depends on geometry, wall distribution, and fill temperature, not solely on resin Vicat data. Published data for this specific configuration is limited; elevated-temperature creep and top-load testing on production containers is required before hot-fill qualification.
Automotive fluid containers represent an application boundary for DMDC-6400 NT 7. Windshield washer solvent, coolant, and diluted urea solutions are considered compatible only after immersion testing according to ASTM D543-20 or OEM-specific protocols because stress cracking and permeation are fluid-specific. The grade is not qualified for automotive fuel tanks, which require high-molecular-weight HDPE with surface treatment or permeation-resistant barrier construction. For aftermarket packaging of hydrocarbon-based cleaners or brake fluid, prolonged immersion can extract low-molecular-weight fractions and reduce mechanical integrity; published data for these fluids in this specific resin is limited. The higher flow of DMDC-6400 NT 7 supports shorter cycle times for 1–5 L containers on rotary blow molding platforms, but the same melt flow characteristics may increase parison length sensitivity when die-head temperature is not controlled within ±5°C.
Regulatory conformance should be established from the supplier’s product stewardship documentation. For food-contact applications, FDA 21 CFR 177.1520 covers olefin polymers provided the finished article meets extractive limitations and end-use conditions. In the European Union, compliance with EU Regulation (EU) No 10/2011 is required for plastic materials intended for food contact, including overall migration limits and substance-specific restrictions. Electrical and electronic equipment applications may require documentation under RoHS Directive 2011/65/EU and REACH Regulation (EC) No 1907/2006. A statement of compliance must correspond to the specific grade and lot; it cannot be transferred from another HDPE resin without manufacturer verification. Incompatibility with strong oxidizing agents, certain hydrocarbon solvents, and high-humidity pellet storage conditions should be evaluated before production release.
