NOVA Chemicals Sclair VLDPE 10A — Application Sectors by Downstream Process

Machine-grade stretch wrap production on a 3,000 mm cast film line with a single-screw extruder at 30:1 L/D and a barrier screw uses Sclair VLDPE 10A at 20–40 wt% of the formulation, with the balance being an octene LLDPE of 1.0–2.0 g/10 min melt index. The grade contributes a nominal density of 0.910 g/cm³ (ASTM D792) and a melt index of 1.0 g/10 min (ASTM D1238, 190 °C/2.16 kg), permitting gauge reduction from 23 µm to 17 µm while retaining puncture resistance measured under ASTM D5748-95(2012) and tensile properties under ASTM D882-18. The cast process is operated at a melt temperature of 230–250 °C, a chill roll set point of 18–25 °C, and an air gap of 10–20 mm; edge trim is reclaimed at 5–15 wt%, and cross-web gauge variation is held below ±2% by beta-gauge feedback control. Polyisobutylene cling agent is introduced at 0.5–2.0 wt% after primary melt blending to prevent screw slippage, and finished rolls are tested for cling force and stretch retention under ASTM D5458-95 and ASTM D882-18. Compliance for this non-food pallet wrap is limited to REACH (EC) No 1907/2006 Article 33 communication and the heavy metal limits of EU Packaging Directive 94/62/EC. The terminal product is 17–23 µm machine-grade stretch film for high-speed automatic palletizing. Published data for this specific grade at the 17 µm gauge limit is limited; converter validation of roll hardness and edge tear at the pre-stretch contact rollers is required before commercial qualification.

What Limits Seal Initiation in High-Speed Frozen Food Packaging?

In three-layer coextruded blown film for frozen vegetable and IQF poultry packaging, the sealant layer carries Sclair VLDPE 10A at 70–90 wt% with 10–30 wt% LDPE for bubble stability, plus silica antiblock masterbatch at 0.1–0.3 wt% and erucamide slip at 300–800 ppm. Food-contact compliance is established under FDA 21 CFR 177.1520(c)(3.2c) for ethylene/α-olefin copolymers with density below 0.925 g/cm³, and under EU Regulation (EU) No 10/2011, Annex I, Table 1, with overall migration not exceeding 10 mg/dm² by EN 1186-1 and GMP per Regulation (EC) No 2023/2006. The blown film line is configured with a die gap of 1.8–2.2 mm, a blow-up ratio of 2.5–3.2, and a frost-line height of 3–5 die diameters; the sealant layer thickness is 35–50 µm within a total film of 60–90 µm. Seal initiation is evaluated by ASTM F2029-16 at a dwell time of 0.5 s and pressure of 0.275 MPa; the limiting variable on vertical form-fill-seal lines running above 40 cycles/min is hot tack rather than ultimate seal strength. Published data for this specific VLDPE grade in frozen-food sealant webs is limited, but converter validation commonly requires a seal initiation temperature below 110 °C and a hot-tack plateau above 120 °C to prevent seal failures during product drop loading and cold-chain compression. The terminal product is pillow pouches and gusseted IQF bags for frozen retail and foodservice distribution.

Heavy-Duty Liner Puncture Resistance in Bulk Mineral Transport

Form-fill-seal liners for bulk mineral and chemical transport are produced from 80–100 wt% Sclair VLDPE 10A with 0–20 wt% high-pressure LDPE, a slip/antiblock concentrate at 0.05–0.15 wt%, and a fluoropolymer processing aid at 200–500 ppm to suppress melt fracture in the die land. The applicable transport regulation is the UN Model Regulations Chapter 6.1 for package performance, with drop and stacking tests conducted at −18 °C after conditioning; film strength is characterized by ASTM D1709-16a dart impact and ASTM D1922-15 Elmendorf tear. The blown film line operates in high-stalk configuration with a die gap of 2.2–2.8 mm, a blow-up ratio of 2.0–2.5, and a stalk height of 8–12 die diameters; film thickness is 125–200 µm with in-line gusseting at 25–35% of layflat width. Process conflict arises when the VLDPE fraction exceeds 90 wt%: low melt stiffness promotes bubble instability at elevated frost-line positions, while LDPE addition raises density-dependent stiffness but reduces dart impact and seam tear resistance. The terminal product is collapsible container liners, drum liners, and FIBC liner inserts for pneumatic trailer loading.

When a VLDPE Sealant Web Meets Biaxially Oriented Polyester in Lamination

A sealant web for flexible lamination is produced from 30–70 wt% Sclair VLDPE 10A and 30–70 wt% LDPE at a finished web thickness of 20–30 µm; slip is added as erucamide at 400–800 ppm and antiblock at 800–1,200 ppm to prevent blocking during roll storage. The web is adhesive-laminated to 12 µm biaxially oriented polyester film using a solventless polyurethane adhesive at 1.5–2.0 g/m², followed by 48 h cure at 40 °C. Compliance is required for the sealant web under FDA 21 CFR 177.1520(c)(3.2c) and EU Regulation (EU) No 10/2011, and for the adhesive under FDA 21 CFR 175.105 in finished food-contact laminates. Seal strength is measured by ASTM F88/F88M-21 after sealing at 120–130 °C and 0.3 MPa for 1.0 s; the lower seal initiation of the VLDPE phase allows sealing through particulate contamination on the inside of side-gusset pouches. Corona treatment of the sealant web to 38–42 mN/m is maintained before lamination to prevent adhesive delamination, and bond strength is verified by ASTM F904-16. The terminal product is stand-up pouches, quad-seal sachets, and flow-wrap laminates for dry food and non-acidic powder applications.

In secondary containment and temporary pond lining, flat-die sheet extrusion of Sclair VLDPE 10A into 1.0–2.0 mm geomembrane uses 97.0–98.0 wt% resin, 2.0–3.0 wt% carbon black masterbatch containing 40 wt% furnace black in an LLDPE carrier, and 0.1–0.3 wt% hindered phenolic/phosphite antioxidant masterbatch. The specification reference is GRI-GM17 for LLDPE geomembranes, supplemented by ASTM D746-20 low-temperature brittleness and ASTM D1004-21 tear resistance; migration and hazardous-substance compliance is covered by REACH (EC) No 1907/2006. The extrusion profile is maintained at 190–220 °C from feed throat to flat die, with a three-roll cooling stack at 70–90 °C and embossed surface texturing applied before wind-up to improve slope friction. Carbon black dispersion is controlled by melt filtration through 100–200 µm screens and verified by ASTM D5596-03(2021); oxidative induction time is measured by ASTM D3895-19 before installation. The terminal product is unreinforced flexible geomembrane for heap leach pads, secondary containment, and agricultural water storage. Published data for this specific VLDPE grade in geomembrane applications is limited, so site-specific validation of tensile elongation under ASTM D638-14 and low-temperature flexibility under ASTM D746-20 is required.

For cold-climate pallet stabilization, high-stalk blown film for stretch hoods is processed from 60–80 wt% Sclair VLDPE 10A and 20–40 wt% octene LLDPE, with a slip masterbatch at 500–1,000 ppm and antiblock at 1,000–1,500 ppm. Strength is characterized by ASTM D882-18 tensile properties and ASTM D5748-95(2012) puncture resistance; because the product is not intended for direct food contact, regulatory compliance remains within REACH (EC) No 1907/2006 and the heavy metal limits of EU Packaging Directive 94/62/EC. The blown film die gap is 1.8–2.2 mm, the blow-up ratio is 3.5–4.5, and the stalk height is held at 8–10 die diameters to induce high machine-direction orientation before the frost line; finished film thickness is 80–120 µm. The collapsed film tube is heat-sealed at the top to form a stretch hood, and stretch application at 120–180% elongation on pallet loaders requires sufficient recovery force to stabilize mixed pallet loads without crushing corrugated corners. The terminal product is a stretch hood for pallet unitization in lumber, beverage, and building-material distribution.