Flat-die extrusion of Chevron Phillips Chemical HDPE EHM6007 into geomembrane liners is specified where the notched constant tensile load ESCR value under ASTM D5397 exceeds 500 h after 10% Igepal CO-630 conditioning, and where oxidative induction time exceeds 100 min under ASTM D3895 at 200°C. The resin's nominal high-load melt index of 8.0 g/10 min (ASTM D1238-20, 190°C/21.6 kg) and density of 0.960 g/cm³ (ASTM D1505-18) support a melt temperature window of 210–230°C on flat-die calendering lines with 120 mm single-screw extruders at L/D 30:1 and working widths of 2,500–3,000 mm. A die gap of 1.5–3.0 mm and roll-stack temperatures of 60–90°C maintain sheet crystallinity and keep edge neck-in below 2% of web width; above this threshold, the trim transport system encounters inconsistent edge-roll contact on hardened steel idlers. Addition ratios for the extrusion compound are set as follows:

Finished sheet is tested under GRI-GM13 for stress cracking, oxidative resistance, and thickness uniformity; ASTM D638-14 tensile yield above 24 MPa at 50 mm/min separates the sheet from linear low-density alternatives; and ASTM D1505-18 density is retained within ±0.002 g/cm³ of nominal after carbon black addition. The process boundary is material-specific: melt temperature above 240°C produces gel particles that appear as pinholing in finished liner, and moisture on pellet surfaces at relative humidity above 60% generates surface splay in the sheet. End product types produced from this configuration include landfill base and cap liners, mining heap-leach pad liners, agricultural canal liners, and secondary containment membranes.

What Limits Bubble Stability When EHM6007 Is Run at a 4:1 Blow-Up Ratio for Heavy-Duty Sack Interlayers?

High-stalk bubble stability on production lines running Chevron Phillips Chemical HDPE EHM6007 with a blow-up ratio of 3.5:1–4.5:1 depends on retention of high-load melt index after reprocessing and on frost line height control at 700–1,200 mm above the die. In this downstream configuration, EHM6007 is dry-blended with 20–40 wt% LLDPE to raise dart impact resistance above 250 g in 25–80 µm film while retaining the HDPE stiffness necessary for sack opening and filling. Extrusion lines use 90–120 mm single-screw extruders at L/D 30:1, spiral mandrel dies from 250–400 mm diameter, and die gaps of 1.5–2.0 mm. Melt temperature is maintained at 199–221°C; excursions above 232°C generate oxidation gels that reduce dart drop and appear as optical defects on printed sack surfaces. Addition ratios for this film are: slip/antiblock masterbatch 1.0–2.5 wt%, white masterbatch 6–10 wt%, and fluoropolymer process aid 0.02–0.05 wt% when output exceeds 250 kg/h. Compliance is referenced to ASTM D1709-22 for drop impact, ASTM D1922-19 for tear, ASTM D882-18 for tensile, ASTM D1238-20 for melt flow, and EU 10/2011 Annex I for indirect food contact in multiwall liners. End products processed under this specification include FIBC inner liners, industrial drum liners, chemical sack inner plies, and construction debris sacks.

Chill-roll cast extrusion of Chevron Phillips Chemical HDPE EHM6007 into 30–120 µm paper replacement substrates is conducted on 1,000–1,500 mm coat-hanger dies with 0.3–0.5 mm die gap and melt temperatures of 210–240°C. The melt curtain is pinned to a 15–25°C mirror-chilled roll through electrostatic pinning or an air knife, which controls haze below 10% and preserves the gloss needed for synthetic paper printability. Calcium carbonate masterbatch is metered at 5–15 wt% to increase flexural modulus and produce paper-like stiffness; optical brightener masterbatch is added at 0.5–1.5 wt% to shift CIE whiteness above 90. Compliance for this conversion is governed by ISO 1183-1:2019 for density, ISO 527-3:2018 for tensile properties, ISO 1133-1:2022 for melt mass-flow rate, REACH Annex XVII for migration restrictions, and RoHS Directive 2011/65/EU for lead, cadmium, mercury, and hexavalent chromium. End products converted from this sheet include tear-resistant envelopes, waterproof horticultural tags, synthetic menu cards, and logistics labels.

Coextruded High-Density Polyethylene Food Liners with EHM6007 as the Stiffness Core

Three-layer blown film coextrusion positions Chevron Phillips Chemical HDPE EHM6007 as the 60–75 wt% middle core in box-liner formats for low-moisture foods, where the resin's 0.960 g/cm³ density and high crystallinity provide moisture vapor transmission measured under ASTM F1249 below 6 g/m²·day for 50 µm film at 38°C and 90% RH. Skin layers of metallocene LLDPE at 20–30 wt% total carry the seal initiation temperature below 105°C, while the EHM6007 core supplies crush resistance for high-speed vertical form-fill-seal filling. Line configuration uses 200–350 mm three-layer spiral mandrel dies, 2.5:1–3.5:1 BUR, 1.8–2.5 mm die gap, and melt temperatures of 190–220°C; the core extruder is sized at 65–90 mm with L/D 24:1 and a barrier screw. Additive ratios in the food-contact skin layers: silica antiblock 0.05–0.15 wt%, erucamide slip 0.05–0.10 wt%, and antioxidant package compliant with 21 CFR 177.1520(c) 3.2a and EU Commission Regulation (EU) No 10/2011 Annex I, with overall migration below 10 mg/dm². End product types are cereal box liners, cracker sleeves, dry pet food liners, and dairy powder liners.

In three-layer agricultural sheet and construction vapor-barrier lines, EHM6007 is specified as the abuse-resistant outer layer at 20–40 wt% of the total film structure, coextruded with LLDPE or LDPE inner layers to retain puncture resistance at -20°C for silage covers. Blown film dies of 400–700 mm diameter run at BUR 2.0:1–3.0:1 and die gap 1.8–2.4 mm; melt temperature is capped at 221°C because higher temperatures cause molecular weight loss and reduce dart drop below 150 g in 100 µm films. Formulation: carbon black masterbatch 1.5–2.5 wt% for UV opacity, hindered amine light stabilizer 0.10–0.30 phr, and fluoropolymer processing aid 0.02–0.05 wt% to manage melt fracture at output above 300 kg/h. Compliance references ASTM E96/E96M-22 for water vapor transmission, ASTM D882-18 for tensile, ASTM D1709-22 for dart impact, and ASTM D1708-18 for elongation. End product types include silage pile covers, temporary crawl space vapor barriers, construction floor protection films, and agricultural fumigation liners.

When HDPE EHM6007 Replaces Kraft Paper in Multiwall Bag Liners

Conversion of multiwall bag inner plies from natural kraft paper to blown film formed from Chevron Phillips Chemical HDPE EHM6007 is executed on narrow tubular lines with 40–65 mm extruders at L/D 30:1, die diameter 100–200 mm, die gap 0.8–1.5 mm, BUR 2.0:1–3.0:1, and melt temperature 190–215°C. The resultant 25–50 µm liner is sealed on an oscillating haul-off to flat widths of 400–900 mm and then inserted into multiwall paper or woven polypropylene sacks. EHM6007 loading is 85–100 wt%, with the balance being LDPE or LLDPE at 0–15 wt% to adjust seal initiation; slip additive is 0.05–0.15 wt% and silica antiblock 0.05–0.20 wt%. Compliance includes FDA 21 CFR 177.1520 for indirect food contact and EU 10/2011 Annex I, with total migration below 10 mg/dm²; dimensional stability is checked under ASTM D1204-14 at 100°C for 30 min. End products include seed bags, pet food bags, mineral powder sacks, and chemical powder multiwall liners.