Yanchang China Coal Yulin (Shaanxi) HDPE HD6007XA is an extrusion blow molding grade high-density polyethylene with a nominal melt flow rate of 0.7 g/10 min at 190 °C under 2.16 kg load (ASTM D1238) and a nominal density of 0.960 g/cm³ (ASTM D1505). The resin is supplied as pellet for hollow-body conversion and is specified only for downstream segments in which parison melt strength, die swell, pinch-off weld integrity, and environmental stress-crack resistance determine container fitness. The following application scenarios are limited to actual extrusion blow molding routes for rigid bottles and small-to-medium containers: dairy and fresh beverage, household and industrial chemical, personal care surfactant, pharmaceutical solid-dose, edible oil and liquid food service, and automotive aftermarket fluid packaging. Injection molded closures, blown film, pipe, and rotational molded parts are excluded from this resin scope because the 0.7 g/10 min melt flow rate and molecular weight distribution do not match the shear and cooling requirements of those processes.

Single-layer extrusion blow molding of milk and fresh juice containers places HD6007XA as the 100 wt% virgin food-contact resin; white TiO₂ masterbatch is metered at 1.0–2.5 wt% to provide light blocking and to separate dairy lots. Calcium carbonate and optical brightener masterbatches are not used in this segment because they alter parison sag and complicate food-contact declarations under double-jurisdiction audits. Compliance for the finished container is evaluated under FDA 21 CFR 177.1520(c) for olefin polymers in contact with food, and under EU Regulation (EU) No 10/2011 with an overall migration limit of 10 mg/dm² in dairy and fruit juice simulants; Chinese domestic shipments require GB 4806.7-2016. On production-scale shuttle machines with grooved-barrel extruder length-to-diameter ratio 24:1, melt temperature is maintained at 190–210 °C at adapter and die, with parison die gap profiled between 1.2–1.8 mm to achieve sidewall thickness 0.35–0.65 mm. Mold cooling water is held at 10–15 °C, blow pressure at 0.60–0.80 MPa, and cooling time below 4–6 s per 500 mL bottle produces pinch-weld hinge cracking in 0 °C drop impact. Terminal products include 200 mL–2 L pasteurized milk, fresh juice, drinkable yogurt, and cream bottles with blow-molded neck finishes; cap sealing surfaces are not injection molded from this grade.

Which Validation Controls Apply to Sodium Hypochlorite and Detergent Bottles?

Sodium hypochlorite and detergent container validation is driven by environmental stress cracking at the pinch weld and sidewall flex zones, not by tensile yield. By weight, HD6007XA is run at 90–100 wt% virgin pellet; clean post-industrial regrind from edge trim and rejected bottles is added up to 10 wt% only when lot-specific environmental stress-crack resistance remains above finished-container acceptance thresholds. Bleach containers filled with 5–12 wt% sodium hypochlorite should not exceed 15 wt% regrind without long-term storage testing, because oxidized regrind reduces molecular weight and accelerates crack propagation at the pinch-off. Packaging compliance is assessed under REACH Annex XVII restrictions for substances in articles, UN Model Regulations Chapter 6.1 design-type tests for dangerous goods packaging, and ADR 6.1 when the filled container exceeds 3 L or carries a dangerous goods classification. Production equipment includes reciprocating screw blow molders and continuous shuttle machines with parison programming; melt temperatures are limited to 190–215 °C because sodium hypochlorite exposure increases sensitivity to frozen-in stress. Mold temperatures 15–25 °C and post-cooling fixtures for 8–12 s control paneling on flat sidewalls, while pinch-off die land length is increased relative to food bottle tooling to keep weld thickness above 0.25 mm. Terminal products are 500 mL–5 L bottles and small jerrycans for liquid bleach, hard-surface cleaners, laundry detergent, and diluted agrochemical adjuvants; containers above 5 L are not assigned to this grade unless the lot certificate confirms a high-molecular-weight tail appropriate for large-part parison hang.

When packaging anionic surfactant systems such as sodium laureth sulfate and cocamidopropyl betaine, the neck and handle pinch-off regions of HD6007XA bottles are subjected to stress cracking that is not predicted by melt flow ratio alone; batch-to-batch variance in comonomer distribution will shift ESCR performance more than a 0.05 g/10 min MFI drift. The packaging component is assessed against REACH Annex XVII restrictions for phthalates and heavy metals in colorants, and against EU Regulation (EU) No 1223/2009 by the filler for the finished cosmetic product; the HDPE container itself is not a cosmetic formula. Addition ratio in this segment is 100 wt% HD6007XA with color masterbatch limited to 0.5–2.0 wt%; pearlescent or metallic masterbatches above 2 wt% narrow the processing window because plate-like pigments increase low-shear viscosity and reduce parison uniformity on shuttle machines. Silicone-based external processing aids above 0.05 wt% are not used in neck-bearing containers because they lower weld strength at the pinch-off. Reciprocating screw machines are operated with melt temperatures 185–205 °C, converging die gap 1.0–1.5 mm, and mold cooling 8–12 °C to maintain surface gloss on polished cavities. The terminal types include 150–750 mL bottles for shampoo, body wash, hand soap, and conditioner; oval and cylindrical formats use thread or snap-cap neck finishes, with closures supplied from polypropylene rather than HD6007XA.

USP <661.1> Packaging Systems and the Limits of HDPE Solid-Dose Bottles

Pharmaceutical solid-dose packaging converts HD6007XA under a qualification regime that treats the polymer as a packaging system component rather than as a standalone approved excipient. Compliance is assessed against USP <661.1> plastic packaging system requirements, Ph. Eur. 3.1.3 polyethylene for containers, FDA 21 CFR 177.1520 for the base olefin polymer, and ICH Q3D elemental impurity risk assessment where the filler’s finished-pack stability studies require it. The resin is processed at 100 wt% virgin pellet; regrind is excluded from the product-contact layer unless explicitly permitted by the pharmaceutical packaging supplier’s change-control procedure, and color masterbatch for amber or opaque bottles is restricted to 0–1.5 wt% with extractables and leachables data supporting USP <661.1>. Blow molding is performed on dedicated or validated campaign equipment with melt temperatures 180–205 °C, cavity cooling at 10–15 °C, and post-mold trimming under filtered airflow; mold release is not used on the product-contact surface. Process validation includes extractables testing, leak testing under USP <1207> or equivalent, and wall thickness distribution mapping at the neck, shoulder, and base. Terminal product scope covers 30–500 mL round and oblong bottles for tablets, capsules, powders, and desiccant canisters; child-resistant closures are supplied separately from polypropylene, not from HD6007XA.

When Edible Oil Fillers Require Top-Load Strength but Not Oxygen Barrier

Ambient-filled cooking oil and liquid food service packaging selects HD6007XA for top-load strength, handle integrity, and consistent wall-thickness distribution rather than gas barrier; monolayer HDPE is not an oxygen barrier and should not be specified for oxygen-sensitive oils without nitrogen flushing or foil induction sealing. Food contact compliance follows FDA 21 CFR 177.1520(c), EU Regulation (EU) No 10/2011 overall migration limit 10 mg/dm², and GB 4806.7-2016 for Chinese domestic distribution. Use ratio is 100 wt% HD6007XA with optional oil-compatible colorant masterbatch at 0–1 wt%; regrind from the same production lot is accepted up to 20 wt% only when the blow molder can document source control and lot traceability, and when finished-container migration remains below the overall limit. Antioxidant masterbatches are not added beyond the resin supplier’s stabilization package, because migration into oil must remain below the overall migration limit. Extrusion blow molding with handled containers uses parison programs that thicken the handle pinch area to 1.0–1.5 mm; melt temperature is held at 190–210 °C, mold temperature at 10–20 °C, and blow pressure at 0.60–0.80 MPa. Screw speed is reduced relative to smaller bottle production to avoid melt temperature overshoot above 215 °C, which produces pinholes at the pinch weld. Terminal products designated for this segment include 500 mL–5 L cooking oil, vinegar, syrup, and food service sauce bottles with handles; seed oils requiring shelf life beyond 6–9 months without modified atmosphere packaging are not placed in monolayer HDPE.

Diesel exhaust fluid (AUS 32) and automotive aftermarket fluid packs use HD6007XA only as a monolayer container for non-flammable fills; the segment imposes ultraviolet resistance, stack loading, and label adhesion constraints that differ from household chemical fills. Packaging for diesel exhaust fluid is governed by ISO 22241-1:2019 for automotive urea solution quality and ISO 22241-3:2019 for handling, transportation, and storage; container materials must not introduce aldehydes or metals that degrade AUS 32. HD6007XA is formulated at 100 wt% virgin pellet; UV-stabilizer masterbatch is added at 0.5–2.0 wt% depending on intended outdoor storage, carbon black at 0.3–1.0 wt% for opaque black packs, and same-family regrind up to 15 wt% where scrap control is demonstrated. Extrusion blow molding on shuttle machines runs with melt temperatures 190–210 °C, die gap 1.5–2.0 mm, and mold cooling 12–18 °C; wall thickness is increased to 0.8–1.2 mm at the bottom chime and handle to resist stack load. Screw and head are purged between color changes to avoid black speck contamination in natural or white retail packs. Terminal products include 1–5 L diesel exhaust fluid packs, windshield washer fluid bottles, and automotive coolant overflow reservoirs; containers for petroleum-based brake fluids are excluded because ester-based brake fluids demand barrier materials or surface treatment.