Yanchang China Coal Yulin (Shaanxi) HDPE T35-600 is specified for extrusion blow moulding and other high-melt-strength conversion processes. Nominal melt flow index is 0.35 g/10 min at 190 °C/2.16 kg according to ASTM D1238-20 and ISO 1133-1:2022; nominal density is 0.960 g/cm³ according to ASTM D1505-18 and ISO 1183-1:2019. The combination of low melt flow, high density, and melt elasticity produces a narrow extrusion blow moulding window, elevated die swell, and finished part stiffness appropriate for rigid bottle, jerrican, and container formats.

UN-Certified Jerrican and Industrial Pail Conversion

The regulatory baseline for the 20 L UN jerrican format is set by UN Model Regulations Chapter 6.1, specifically 6.1.3 construction requirements, 6.1.5.3 drop test, 6.1.5.4 leakproofness test, and 6.1.5.5 internal pressure test. T35-600 is converted with 15–25 wt% clean post-industrial regrind from the same UN packaging operation; color masterbatch is added at 1.5–2.5 wt%, and UV stabilizer at 0.2–0.5 wt% when export containers are exposed to extended yard storage. Extrusion blow moulding is performed on accumulator-head machines with screw L/D 24:1–30:1, compression ratio 2.5:1–3.5:1, melt temperature 180–210 °C, die temperature 190–215 °C, mould temperature 12–28 °C, and blow pressure 0.6–0.8 MPa. Parison programming must offset a die swell of approximately 35–55%; sidewall, top chime, and bottom chime thickness profiles are programmed to maintain UN drop performance after conditioning at −18 °C. Because high-density grades near 0.960 g/cm³ typically exhibit lower ESCR margins than medium-density blow moulding grades, converters may increase sidewall thickness or optimize pinch-off geometry for surfactant-bearing products. A production failure mode observed on accumulator-head lines is pinch-line thinning when the parison is run above 210 °C or when the accumulator shot speed is increased without a corresponding increase in die gap; the defect appears as lowered internal pressure resistance and leakage at the flash weld. Terminal products are open-top pails of 5 L, 10 L, 20 L, 25 L, 30 L and tight-head jerricans of 3H1 and 3H2 classification with EPDM or foamed PE gaskets.

Detergent bottle converters running T35-600 on single-station and twin-station shuttle blow moulding lines evaluate the grade for compatibility with chlorinated bleach and cationic surfactant-rich formulations. The article-level regulatory baseline is REACH EC 1907/2006, and assembled trigger-spray packages must comply with CLP EC 1272/2008 for labelling. Masterbatch addition typically ranges 1.0–2.0 wt%, and antistatic additive concentrates are incorporated at 0.15–0.30 wt% to reduce dust attraction on high-speed filling lines. Conversion is extrusion blow moulding with automatic deflash and closed-loop regrind; regrind is limited to 25 wt% because mill data from a twin-station shuttle machine showed that regrind above 30 wt% increased melt-pressure fluctuation and produced parison instability at the lower pinch line. Mould temperatures are maintained at 15–30 °C. Terminal products are 500 mL, 750 mL, 1 L, 2 L bottles for liquid laundry detergent, fabric softener, bleach, and trigger spray cleaners.

What Limits Ambient Food Contact Bottle Production with a 0.960 Density Grade?

Food contact suitability for T35-600 in ambient formats is evaluated through documented compliance with FDA 21 CFR 177.1520(c) for olefin polymers, EU Regulation (EU) No 10/2011 Annex I with an overall migration limit of 10 mg/dm² for plastic food contact materials, and China GB 4806.7-2016. Addition conditions for food-grade bottle production restrict masterbatch content to 0.5–1.5 wt% using food-contact carrier resins; closed-loop regrind from the same food packaging line is acceptable up to 25 wt% under EU 10/2011 provided traceability is maintained. Extrusion blow moulding is configured with food-grade hydraulic oils and silicone-free mould release; melt temperature is held at 175–200 °C because prolonged exposure above 205 °C increases oxidative degradation byproducts that can alter organoleptic properties. The grade is not suitable for carbonated beverage bottles or hot-fill formats above 60 °C due to gas barrier and thermal dimensional limits. Terminal products are 500 mL, 1 L, 2 L edible oil bottles, soy sauce and vinegar bottles, condiment squeeze bottles, and dry powder food jars.

Within extrusion blow moulding of personal care package formats, T35-600 is evaluated for surface gloss, drop impact, and compatibility with surfactant, ester, and hydrocarbon-containing cosmetic formulations. The applicable regulatory baseline is REACH EC 1907/2006 for the article, with manufacturing hygiene governed by ISO 22716:2007; food-contact status under 21 CFR 177.1520 may apply only when formulation contact is negligible. Masterbatch addition for opaque or pearlized high-gloss bottles is 1.5–3.0 wt%, and when fragrances or volatile hydrocarbons are packaged, a co-extruded EVOH barrier layer of 3–6% of total wall thickness is placed between HDPE skins. Extrusion blow moulding uses mould temperature 10–25 °C, blow pressure 0.6–0.9 MPa, and continuous shuttle or rotary wheel equipment. Terminal products are 100 mL, 200 mL, 400 mL shampoo and body wash bottles, 50 mL cream jars, and 250 mL lotion bottles with snap-fit closures. High density supports dimensional stability in bottle necks, but low-temperature drop performance falls off when sidewall thickness is below 0.7 mm; travel-size and thin-wall formats are typically specified at 0.8–1.1 mm.

When T35-600 Meets USP <661.1> Requirements for Oral Solid Containers

Pharmaceutical packaging qualification for HDPE oral solid containers requires compliance with USP <661.1>, Ph. Eur. 3.1.3 Polyolefines, and FDA 21 CFR 177.1520 for the base resin. Addition levels in pharmaceutical bottle conversion are minimized: titanium dioxide white masterbatch at 1.0–2.0 wt% is used for light-opaque containers, while slip agents such as erucamide and oleamide are excluded because migration can alter stability-indicating assay results for oxygen-sensitive solid dosage forms. Extrusion blow moulding is conducted in an ISO 14644-1 Class 8 cleanroom, with pellet conveying under dehumidified air at a dew point ≤ −20 °C to prevent surface moisture streaks. Melt temperature is controlled at 180–200 °C; automated parison trimming avoids manual contact contamination. Terminal products are 30 mL, 60 mL, 100 mL, 250 mL bottles for oral solid tablets, capsules, powders, and nutraceutical preparations, typically fitted with child-resistant closures and induction-seal liners. The grade is not qualified for parenteral primary containers, and steam sterilization above 121 °C exceeds the dimensional stability window.

Solvent-bearing agricultural chemical pack formats require barrier coextrusion or fluorination

For liquid herbicide and insecticide container conversion, T35-600 is evaluated against UN Model Regulations Chapter 6.1 for hazardous goods packagings and CLP EC 1272/2008 for labelling of formulated products. Addition levels for agrochemical packaging include UV stabilizer at 0.5–1.0 wt%, color masterbatch at 1.0–2.0 wt%, and a polyamide barrier layer at 4–8 wt% of total wall thickness in co-extruded structures. For monolayer containers used with solvent-bearing emulsifiable concentrates, in-line fluorination with 0.5–1.5% F₂/N₂ gas mixture after moulding is applied to reduce solvent permeation; published data for this specific T35-600 configuration is limited, and process conditions must be verified by bottle wall-section permeation testing under ASTM D3985 or ASTM F1307. Extrusion blow moulding uses multi-layer die heads for HDPE/PA/HDPE layer sequences, melt temperature 180–210 °C, and mould temperature 12–25 °C. Terminal products are 500 mL, 1 L, 5 L, 10 L, 20 L containers for emulsifiable concentrate pesticides, suspension concentrates, and liquid fertilizers; formulations above 20% highly polar oxygenated solvents require compatibility testing before commercial conversion.