In extrusion blow molding of oxidising household formulations—sodium hypochlorite solutions within 3–8% available chlorine, nonionic surfactant blends, and citric acid-containing descalers—DGDK-3364 is processed at a melt temperature of 190–210 °C using a barrier screw with 22:1–25:1 L/D and a grooved feed throat. The resin has a density of 0.953 g/cm³ measured by ASTM D1505 and a melt flow rate of 0.7 g/10 min at 190 °C/2.16 kg per ISO 1133-1:2022. In a continuous shuttle machine producing a 30 g, 1 L bottle, parison length variation of ±1 mm shifts bottle weight by 1.8–2.2 g; die gap corrections are therefore implemented after every colour masterbatch lot change because carrier resin melt index differences alter parison swell by ±0.5 mm at the die exit. Extrusion pressure remains between 25 MPa and 35 MPa; melt temperature above 220 °C produces gel particles and increases odour carryover into closures.

Regulatory compliance for household chemical package bodies uses UN 1791 when the bleach solution exceeds 5% available chlorine and falls under Class 8 PG III; packaging is tested to UN 6.1.5 with a 0.8 m drop height and 100 kPa hydraulic pressure. Stress-crack resistance is measured by ASTM D1693; published F50 values for DGDK-3364 exceed 600 h in 10% Igepal CO-630 at 50 °C. The addition ratio for colour masterbatch is 1.5–3.0 wt%, antistatic masterbatch 0.1–0.3 wt%, and slip masterbatch 0.05–0.2 wt%; total masterbatch loading above 4.0 wt% creates swirl marks and weakens pinch-off welds. Pre-drying is unnecessary below 60% plant RH; above 60% RH, desiccant drying at 80 °C for 2–3 h prevents splay in the pinch-off area. Finished articles include 500 mL trigger sprayer bottles, 1 L bleach bottles with 38 mm neck finishes, and 5 L detergent containers with integrated handles.

Does DGDK-3364 Retain Organoleptic Neutrality in Aqueous Food-Contact Bottles Without Secondary Drying?

Food-contact qualification for DGDK-3364 centres on compliance with 21 CFR 177.1520(c) 3.1a/3.2a for high-density polyethylene and EU Regulation (EU) No 10/2011, including the overall migration limit of 10 mg/dm² for food contact surfaces. The resin is processed without added slip or antiblock in most food applications; colour concentrate is metered at 0.5–2.0 wt% using a PE-carrier masterbatch whose pigment and carrier system is food-contact listed under the same regulation. At 2.0 wt% loading, sensory neutrality in aqueous simulants is assessed by ASTM E1870 odour and flavour transfer screening; above 4.0 wt% masterbatch, extractable organic carbon increases and the package may fail organoleptic screening for high-fat simulants. If retained moisture from warehouse exposure above 60% RH is suspected, pre-drying at 80 °C for 2–4 h is required to avoid splay and surface pits that increase cleanability risk.

Extrusion blow molding for 200 mL–2 L food bottles uses a single-screw extruder with 20:1–24:1 L/D and a chrome-plated screw; melt temperature is 180–215 °C, die gap 0.8–2.2 mm, and blow-up ratio 2.5:1–3.2:1. Injection blow molding of 100–500 mL food jars uses preform injection at 190–210 °C and blow mold temperature 5–15 °C; this lower mold temperature improves neck thread dimensional stability to ±0.15 mm. Finished product types include 250 mL condiment squeeze bottles, 500 mL sauce bottles, 750 mL fruit syrup bottles, and 1 L edible oil bottles. Hot-fill temperatures above 60 °C are outside the recommended continuous service window because sidewall deformation under top load exceeds 2 mm at 65 °C.

Agrochemical container specifications introduce a qualification burden that does not apply to household or food packaging. A 1 L herbicide bottle made from DGDK-3364 must simultaneously satisfy UN packing group II hydraulic burst retention, stack load resistance at 40 °C, and resistance to xylene or ketone-based adjuvant formulations. The industry compliance framework is UN 6.1.5 in conjunction with ADR/RID 6.1.5 for European road and rail transport; the drop-test height for PG II liquids is 1.2 m, and the hydraulic test pressure is 100 kPa. UV stabiliser masterbatch is added at 0.3–0.8 wt%, colour concentrate at 1.0–2.0 wt%, and fluoropolymer processing aid at 0.02–0.08 wt% only when intermittent shear-induced melt fracture appears in the parison. LLDPE-rich regrind above 10 wt% reduces parison melt strength and must be excluded from tight-weight bottles requiring ±1 g tolerance.

The downstream process is continuous shuttle or accumulator-head extrusion blow molding with a die gap of 1.0–2.5 mm, melt temperature 185–210 °C, and mold temperature 10–25 °C. For 5 L containers, cooling time dominates cycle time at 18–25 s; insufficient cooling below 40 °C demolding temperature results in handle pinch-off warpage greater than 1.5 mm. Batch-to-batch variation in DGDK-3364 swell ratio can shift container gross weight by 2.5–3.5 g on a 650 g jerrycan if parison programming is not adjusted. Finished product types include 0.5 L foliar-feed bottles, 1 L herbicide and insecticide bottles, 5 L agricultural adjuvant containers, and 10 L agchem jerrycans with calcium carbonate-filled HDPE closures being avoided because filler addition above 5 wt% raises neck abrasion during capping.

Pharmaceutical Bottle Wall Uniformity and USP Extractable Limits

Injection blow molding of pharmaceutical bottles places two measurable constraints on DGDK-3364: wall thickness distribution sufficient to maintain fill volume accuracy, and extractable profile compliance with USP <661.1> and USP <661.2>. The polymer complies with 21 CFR 177.1520 for drug packaging under conditions of use A–C; elemental impurity limits are assessed against ICH Q3D under the oral solid dose route. Colour masterbatch is limited to 0.5–2.0 wt% when required, and no slip, antistatic, or external lubricant is used unless the finished system is re-qualified under USP <661.1> physicochemical suitability. At 2.0 wt% TiO₂-containing masterbatch, total extractables in 50% ethanol at 70 °C are below 5 mg/L; this value is re-verified after each masterbatch lot change because low-molecular oligomer contribution varies with carrier resin source.

The downstream process is injection blow molding with preform injection at 190–210 °C, blow mold temperature 5–15 °C, and blow pressure 0.8–1.2 MPa. For a 200 mL round bottle, wall thickness variation is maintained within ±0.15 mm; mold temperature fluctuations exceeding ±3 °C create asymmetric sidewall thinning and become a primary cause of USP fill volume deviation. The pre-drying protocol is mandatory when resin moisture exceeds 0.05 wt%: 80 °C for 2–4 h in a desiccant dryer. Finished product types include 30 mL liquid oral syrup bottles, 100 mL solid dose bottles with child-resistant 38 mm necks, and 250 mL veterinary bolus containers; closure torque retention after 21 days at 40 °C must remain above 1.2 N·m without neck stress cracking.

When Recovered Plant Scrap Exceeds 15 wt%, Solvent Container ESCR Falls Nonlinearly

Solvent and hydrocarbon-based industrial fluids create the most aggressive stress-cracking environment outside agrochemicals. Containers for white spirit, diesel fuel additives, coolant concentrates, and brake cleaner formulations are blow molded from DGDK-3364 with a standard regrind addition ratio of 10–15 wt%. At 15 wt% cleaned in-house scrap, ESCR retention remains above 80% of virgin resin when measured by ASTM D1693; raising regrind to 30 wt% can lower F50 by more than 40% because gel accumulation and oxidative history accelerate crack initiation at pinch-off welds. Carbon black masterbatch is added at 2–3 wt% to block UV-induced embrittlement, and antistatic masterbatch at 0.5–1.0 wt% for solvent containers to reduce surface resistivity below 10^11 Ω/sq per IEC 61340-2-3. Published data for this specific configuration is limited; the regrind ceiling must be validated on the target accumulator-head machine rather than extrapolated from small-shuttle data.

The process window is narrower than beverage or food packaging because parison length for a 20 L jerrycan reaches 700–900 mm and sag compensation requires 25–35 programming points. Melt temperature is 190–210 °C, die gap 1.5–3.0 mm, mold temperature 8–15 °C, and blow pressure 0.9–1.1 MPa. Excessive screw back pressure above 30 MPa raises melt temperature in the accumulator head by 3–5 °C, reducing ESCR by an estimated 15–25% and causing inner pimples on the container base. Drop impact qualification follows UN 6.1.5 for PG II liquids at 1.2 m; leakage is not observed when wall thickness remains above 1.8 mm at the thinnest point. Finished products include 5 L oil containers, 10 L degreaser jerrycans, 20 L stackable carboys with 6.5 mm closure threads, and 25 L coolant drums for workshop distribution.

Injection blow molding tightens neck finish tolerances for 250 mL personal care bottles

For 100–500 mL personal care bottles—shampoo, body wash, conditioner, and lotion packaging—DGDK-3364 is processed by injection blow molding when the neck finish must hold a flip-top closure without leakage, and by extrusion blow molding when a decorative tapered sidewall requires broad parison programming. The regulatory basis is EC 1223/2009 for cosmetic packaging safety assessment; the plastic itself remains covered by EU No 10/2011 migration limits if the product is applied to skin, although the package is not a food-contact article. Pearlescent or colour masterbatch is added at 1.0–2.5 wt%, and UV absorber masterbatch at 0.2–0.5 wt% when tinted formulas require protection from retail lighting. Ester-based fragrance masterbatches above 1.5 wt% plasticise the inner neck surface and reduce thread hoop strength by up to 15%; they are not used for snap-fit closures.

In extrusion blow molding with 12–24 cavity shuttle machines, the 250 mL bottle is produced at 185–205 °C melt temperature, 10–20 °C mold temperature, and cycle time 8–15 s. Injection blow molding for 100 mL travel-size bottles uses preform injection at 190–210 °C and blow mold at 5–12 °C; neck internal diameter tolerance is held at ±0.10 mm to prevent cap leakage at 0.07 MPa internal pressure. Batch-to-batch tint variation is controlled by gravimetric masterbatch feeders with ±0.1 wt% accuracy, because colour shift above ΔE 1.0 violates retail colour-matching protocols. Finished product types include 100 mL travel bottles, 250 mL shampoo bottles with 24/410 necks, 400 mL body wash containers, and 500 mL pump bottles for lotions.