LG Chem HDPE FD0100 is a high-density polyethylene film resin supplied as pellets for air-cooled blown film extrusion. The product is conventionally assigned a nominal melt mass-flow rate of 0.10 g/10 min at 190 °C under 2.16 kg load and a base density of 0.950 g/cm³, with test methods ISO 1133-1:2022 and ISO 1183-1:2019 respectively; these values should be read as specification centre points rather than single-lot guarantees. The resin is positioned for thin-gauge high-density film applications—retail carrier bags, kitchen and industrial liners, agricultural overwrap, and stiff packaging webs—where the density-driven modulus and moisture-barrier contribution of HDPE outweigh the tear and puncture limits of the polymer class. The grade is not formulated for injection molding, thick-wall pipe extrusion, or blow molding, where higher flow indices or bimodal molecular architectures are required to meet the different cooling, hydrostatic, and cycle-time demands.

The nominal density of 0.950 g/cm³ places FD0100 at the upper end of film-grade HDPE and correlates with a crystalline fraction above 60% when measured by differential scanning calorimetry. This crystallinity contributes to a tensile modulus in the 700–1,100 MPa range for isotropic compression-molded specimens under ISO 527-2, although blown film surfaces develop orientation-induced anisotropy and must be reported in the machine and transverse directions separately under ISO 527-3:2018. The medium molecular-weight architecture provides enough chain entanglement to resist bubble instability but not so much that melt fracture dominates at normal shear rates.

Flow Behaviour and the Role of a 0.10 g/10 min Melt Index

The single-point melt index is not a rheological master curve. For FD0100, a value of 0.10 g/10 min indicates relatively high molecular weight; in production, this appears as elevated melt strength at low shear and permits a stable bubble between 2:1 and 4:1 blow-up ratio without excessive sag. The trade-off is reduced output relative to film grades with MFR values above 0.50 g/10 min, because screw speed, discharge pressure, and motor amperage reach extruder limits earlier. Capillary rheometry on similar low-MFR HDPE film resins shows apparent shear viscosity between 1,200 Pa·s and 3,500 Pa·s at 190 °C and 100 s⁻¹; published lot-specific data for FD0100 is limited. The molecular-weight distribution is sufficiently broad to support extensional strain hardening in the bubble, but not so broad that low-molecular-weight fractions dominate the seal response.

On a blown film line with a 90 mm grooved-feed extruder, 30:1 L/D barrier screw, and 1.2 mm die gap, melt temperature set points for FD0100 are typically maintained between 210 °C and 230 °C. The blow-up ratio should be held at 3:1 to 4:1 for balanced MD/TD tear, and the frost line is commonly positioned 8–12 die diameters above the air ring. Higher melt temperatures above 240 °C trigger oxidation and gel formation in high-density polyethylene, while lower temperatures below 190 °C increase melt fracture and reduce bubble stability, particularly at frost-line heights below 6 die diameters. The onset of melt fracture in HDPE is governed by shear stress at the die lip. For slit dies with a 1.2 mm gap, critical shear rates above 1,000 s⁻¹ can induce sharkskin; therefore, line speed increases are better achieved by increasing die circumference than by raising screw speed alone. Film thickness below 20 µm requires external bubble stabilization and closed-loop die-gap control; internal bubble cooling is less common for HDPE than for LLDPE but is sometimes applied above 1,000 kg/h throughput to separate gauge bands and increase output. Gels generated by degraded resin are visible on the film surface and are monitored by film-winder camera systems with 50 µm minimum defect resolution.

Batch-to-batch variation in melt index is commonly controlled within ±0.02 g/10 min, and density within ±0.001 g/cm³, in commercial HDPE film resin. These tolerances permit stable process settings without changing die gap or frost-line height for every lot. A lot falling outside this range should be quarantined because it can shift bubble diameter, alter gauge profile, and change the measured seal window. Because HDPE is not hygroscopic, pre-drying is generally unnecessary when pellets are stored in sealed packaging. However, surface moisture can accumulate on pellets from ambient condensation when silo or bin transfer occurs below dew point; in such cases, a dehumidified air hopper at 60–80 °C for 2–4 h is used to prevent steam-induced bubbles and melt-line pressure variation. The resin should be protected from direct UV exposure during storage because prolonged ultraviolet radiation can oxidise the surface and raise gel count in the film.

What Limits the Heat Seal Response of High-Density Film Grades?

High-density polyethylene with a density near 0.950 g/cm³ has a crystalline fraction above 60%, measured indirectly by differential scanning calorimetry at a heating rate of 10 K/min under inert atmosphere. The melting peak for such linear resins is generally in the 130–135 °C range. Consequently, heat sealing of FD0100-based films requires a narrow jaw-temperature window; initiation is typically observed near 135 °C, and seal strength increases up to 150 °C before excessive thinning or burn-through occurs at the film edge. This narrows the process envelope compared with LDPE and LLDPE, which soften through broad melting distributions and can be sealed across a wider range. Seal strength must be measured per ASTM F88/F88M-21 with a fixed dwell time and pressure, because seal-bar temperature, dwell time, and Teflon-coated jaw condition are co-independent variables. A typical screening utilises a pneumatic sealer with 0.3 s dwell and 0.275 MPa jaw pressure, but these settings must be re-qualified for the specific film structure. For film thickness below 20 µm, reducing jaw temperature by 5–10 °C from the gauge-optimised setting prevents edge perforation. The actual seal-initiation point is not a resin specification; it is a function of film gauge, slip and antiblock additives, machine speed, and jaw dwell time.

FD0100 is selected for high-strength carrier bags, industrial liners, overwrap, and agricultural ground films where stiffness and moisture resistance dominate. When film properties are qualified, tensile yield and elongation are measured under ISO 527-3:2018, dart impact resistance under ASTM D1709, and Elmendorf tear under ASTM D1922. HDPE film in the 0.950 g/cm³ density class generally shows moisture vapour transmission rates below 5 g/m²·day for 25 µm film at 38 °C and 90% RH per ASTM F1249-20; the same film is oxygen-transparent relative to PVDC or EVOH, so barrier applications require coextrusion or metallisation. Print adhesion and surface treatment are operation-specific; untreated layer surfaces are not ink-receptive, and corona treatment should be verified to 38–42 mN/m dyne level before flexographic or rotogravure printing. Food-contact suitability depends on formulation and conversion hygiene; a converter must assess the finished article under FDA 21 CFR § 177.1520 and, where applicable, Regulation (EC) No 10/2011 with migration testing under the intended food simulant and temperature.

The additive package in FD0100 is typical for film-grade HDPE, but the exact slip and antiblock concentrations are not general-purpose and must be selected for the final film’s coefficient of friction and blocking behaviour. Slip additives migrate to the surface and reduce the coefficient of friction over time; this migration is temperature-dependent and can affect heat-seal strength and surface energy. Converters should measure coefficient of friction under ASTM D1894 and blocking under ASTM D3354 after conditioning at 40 °C for 48–72 h to allow slip migration to reach equilibrium. In coextruded structures where FD0100 is placed in a core layer, the HDPE layer contributes stiffness and moisture resistance while LLDPE skins provide seal and dart impact; the high melt point of HDPE creates a viscosity mismatch with LLDPE, so layer melt pressure and pilot-line trials at the target layer ratio are required before commercial conversion.

When Downstream Converters Add Recyclate or Color Masterbatch

Addition of post-consumer recyclate or colour masterbatch alters the rheological balance of FD0100. Because the base grade has low melt index of 0.10 g/10 min, blending with a high-MFR concentrate—commonly a pigmented LLDPE or LDPE carrier—creates a two-phase viscosity mismatch in the screw channel. This mismatch can appear as melt-temperature overshoot, pressure variation across the screen changer, and gauge bands in the finished film. On a typical line equipped with a gear pump and 80/150/325 mesh screen pack, polymer melts with different viscosity distributions are better homogenised by adding mixing sections and restricting concentrate addition to the minimum concentration needed for opacity; validation should be based on final-gauge film, not pellet colour alone. Most colour concentrates are trialled from 1 wt% to 5 wt%; higher loadings are technically feasible but must be tested for dart impact and tear because inorganic pigment particles act as stress concentrators in the thickness range 15–25 µm. Post-consumer HDPE recyclate has a lower intrinsic viscosity and will increase gel count, reduce bubble stability, and lower dart impact per ASTM D1709; therefore, converters should limit recyclate inclusion to a level where the final tensile and impact properties still meet customer specifications and any food-contact statements are revalidated.

FD0100 differs from HDPE blow-molding and injection-molding grades primarily in molecular weight and flow-path design. An injection grade with an MFR of 4–20 g/10 min fills thin-wall cavities at low injection pressure, but does not maintain melt strength in a free-standing blown film bubble; a blow-molding grade with melt flow values between 0.2 g/10 min and 1.0 g/10 min develops high environmental stress cracking resistance and thick-wall impact, but may not provide the same thin-gauge drawdown as a film-grade HDPE. Relative to LLDPE octene film resins in the 0.918–0.925 g/cm³ density range, FD0100 has higher flexural stiffness and lower moisture transmission, but lower dart impact and puncture resistance; this is measured by ASTM D1709 and ASTM D5748 respectively. Relative to MDPE film grades near 0.935 g/cm³, FD0100 delivers greater top-load and tensile stiffness but sacrifices low-temperature ductility; the difference is governed by density and short-chain branching, not by nominal melt index alone. For converters that require retention of bag opening force in cold storage, a blend of FD0100 with an LLDPE or MDPE coextruded layer is validated rather than relying on a single material to satisfy opposing requirements.

Because a high-density polyethylene with a density near 0.950 g/cm³ may undergo a ductile-to-brittle transition above -20 °C, applications intended for freezer service require testing under actual cold conditions. The standard dart impact test is normally run at 23 °C and 50% RH, not at freezer temperature; converter trials should include conditioning at -20 °C for 24 h before impact testing and should compare the result with LLDPE control film of the same gauge.

Validation Protocols Surface Before Commercial Film Release

Before registration of a new film structure, the converting line validates incoming resin against the following test designations and applicable regulatory frameworks. The test matrix does not replace current supplier documentation but establishes minimum batch-release information and helps separate resin-dependent variation from machine-dependent variation.

Published data for FD0100-specific capillary rheometry and oxygen permeation is limited; converter validation therefore relies on a combination of the supplier certificate of analysis and first-article film testing at the target thickness. The processing boundary is defined by melt temperature, not by ambient temperature alone: sustained residence time above 230 °C in a single-screw extruder can raise gel counts, while frost-line changes of less than 10% of die diameter alter TD gauge variation. These effects must be separated from incoming pellet lot variation by releasing film under ISO 4593 thickness sampling and ISO 527-3:2018 tensile testing before product registration.