Equate LLDPE EFDC-7050 is a butene-based linear low-density polyethylene produced by gas-phase polymerisation and intended primarily for tubular blown film extrusion. The nominal pellet melt flow rate is 0.5 g/10 min when determined at 190°C under a 2.16 kg load according to ISO 1133-1:2022, and the nominal base-resin density is 0.918 g/cm³ when measured according to ISO 1183-1:2019. The grade is not a high-pressure low-density polyethylene and should not be treated as a metallocene-catalysed linear low-density polyethylene; its butene comonomer and molecular architecture place it in the general class of Ziegler-Natta C4-LLDPE film resins. The designation `EFDC-7050` does not by itself impose specification limits. Certificate-of-analysis parameters, including lot-specific melt flow rate, density, additive package, and catalyst residue, remain the binding release criteria. Typical physical values summarized in this document are extracted from publicly available producer literature and are not batch guarantees. The resin is supplied in pelletized form, and bulk handling behaviour should be confirmed from the producer’s packaging and silo data.

Typical application areas include general-purpose liners, garment films, agricultural film, protective films, and light-duty carrier bags. In each case end-use performance must be verified against the specific film construction, additive package, gauge, and conversion line. The grade’s position within the linear low-density polyethylene range makes it a candidate for monolayer and coextruded blown film structures where a balance of drawdown, tear strength, and sealability is required.

What Are the Normative Property Boundaries for EFDC-7050?

Table 1 consolidates typical physical and film property values. Film specimens were produced at 25 µm gauge and 2.5:1 blow-up ratio on a laboratory-scale blown-film line equipped with a 40 mm barrier screw and a 60 mm die; the values therefore represent a comparative baseline rather than an upper or lower specification boundary. Commercial equipment, die diameter, frost-line height, temperature profiles, and additive package will shift absolute results. The appropriate test methods are indicated in each row because film mechanical values are preparation-dependent. The tabulated values are reported as typical lot data, not as process capability indices.

Converters producing high-barrier coextruded films should not apply the elongation and tear values as design limits without running internal capability studies according to ASTM E2587-15 or equivalent statistical process control protocols. Density and melt flow rate values are normally assessed on pellet samples, while film mechanical values are assessed on conditioned film. Film property results can be influenced by frost-line height, screw speed, die gap, and ambient temperature; therefore, direct comparisons between suppliers require identical sample preparation and conditioning.

When High-Stalk Film Lines Exceed 2.5:1 Blow-Up Ratio

In high-stalk tubular film extrusion configurations where stalk height is held above 6 die diameters and blow-up ratio exceeds 2.5:1, melt strength and shear-thinning behaviour govern the stable operating window. The grade should be processed through a barrier screw with an L/D ratio of at least 24:1 to avoid unmelts and pressure surging. Barrel temperatures in the feed section are customarily set at 170–180°C, with transition zones at 190–205°C and the die head at 210–220°C. A die gap of 1.2–2.4 mm supports die-lip shear stress below the melt fracture threshold for this melt flow rate, but narrowing the gap below 1.0 mm increases the probability of sharkskin on the outer film surface when output pushes specific throughput above 0.35 kg/h per mm die circumference. The specific throughput value is a general class reference and not a rated limit for this exact grade; published data for production-scale internal bubble cooling high-stalk lines running EFDC-7050 is limited.

Frost-line height should be controlled within ±50 mm to avoid transverse dimensional variation and uneven orientation that manifests as tear anisotropy and blocking tendency. Rheological checks using a capillary rheometer at 190°C show shear-thinning behaviour typical of the resin class; apparent viscosity at 100 s⁻¹ is commonly in the range 500–800 Pa·s for a 0.5 g/10 min butene LLDPE. That range is not an EFDC-7050 lot guarantee and should not be substituted for lot-specific rheology. The most sensitive indicator of process drift is pressure head at constant screw speed and die temperature. A pressure variation exceeding ±10% over a 30-minute period often indicates feeding inconsistency, melting failure, or partially blocked screen packs, and should trigger a gap or screen-pack inspection.

Output stability can be evaluated by continuous mass flow metering and film thickness scanning. In many blown-film lines, gauge variation below ±5% is acceptable for general-purpose films; however, when the film is sold by area yield, tighter variation may be required. The low melt flow rate of EFDC-7050 increases back-pressure relative to higher-melt-index grades, so drive sizing and screw cooling must be adjusted accordingly. Pressure at the breaker plate should be monitored; sustained pressure above 350 bar on a 24:1 extruder indicates screen-pack blinding or insufficient melt temperature. Grade-specific upper limits should be derived from the extruder manufacturer’s safety calculations and rheology curves.

Downstream Conversion Windows and Heat-Seal Response

Surface treatment before printing should achieve wetting tension above 38 mN/m when tested with formamide/ethyl cellosolve test inks per ISO 8296. Corona treater output must be balanced against film slip and storage time; treated film stored more than 3 months or exposed to ambient temperatures above 30°C may show decay of treatment level to below the printing threshold. Water-based flexographic inks and UV-curable inks exhibit different adhesion on polyolefin films, and the converter should qualify with a scuff resistance test such as ASTM D5264-19. Winding tension for thin gauges below 15 µm should be reduced to 100–150 N/m to prevent blocking and film stretching; tension control is especially critical when winding at speeds above 150 m/min. Corona treatment at power densities above 2.0 W min/m² may reduce slip additive effectiveness and increase background odour in printed laminates. These ranges reflect industrial practice for this resin class and not product-specific limits.

Sealing response is a function of comonomer type, density, and molecular weight distribution. For butene-based LLDPE film of 0.918 g/cm³ density, seal initiation is observed in the range of 105–115°C under flat-film seal conditions. Production sealing jaws typically operate at 120–150°C with dwell times of 0.5–1.0 s and jaw pressure of 2.0–4.0 N/mm²; the optimal set point depends on film thickness, seal bar design, and whether the structure is monolayer or coextruded. Published data for EFDC-7050 at all seal conditions is limited, so converters must generate heat-seal curves according to ASTM F88/F88M-23 on the actual sealing machine. Slip and antiblock additives, if present, modify seal strength and coefficient of friction. At addition levels above 1500 ppm erucamide, seal initiation can shift upward and block force on rewind can be reduced. The user should not infer product performance without assessing additive package because EFDC-7050 can be supplied with various additive formulations.

Across blown film operations, substitution of EFDC-7050 for a hexene- or metallocene-catalysed LLDPE produces measurable differences only when the same die gap, air ring condition, and gauge profile are used. Butene short-chain branching reduces tie-chain concentration relative to hexene copolymers at equivalent density; this often depresses dart impact and puncture resistance while maintaining adequate modulus for general-purpose films. Metallocene grades with narrower molecular weight distribution may provide lower haze and improved seal initiation performance, but their lower melt strength can require more aggressive bubble stabilization. Conversely, EFDC-7050 displays broader molecular weight distribution and higher shear thinning, which stabilizes melt pressure and reduces die-lip deposition during extended runs. Direct ranking against specific resins should be conducted on the same production line; published data for direct substitution in high-stalk internal bubble cooling lines is limited.

Compliance Status Is Restricted to Specific Chemical-Use Conditions

The base resin may be used in certain food-contact applications only when the finished article meets the requirements of FDA 21 CFR 177.1520 and all applicable national regulations. The compliance statement applies to the base polyolefin and does not extend to pigments, slip agents, or other additives compounded after pellet production. For European Union, the resin is subject to REACH (EC) No 1907/2006; compliance with registration and restriction obligations should be verified against the current Safety Data Sheet. The resin is not formulated with phthalate plasticizers, and its polyolefin chemistry typically results in heavy metal levels below the packaging waste limits. Table 2 lists the reference standards commonly used in compliance documentation.

Batch-specific documentation, including certificates and analytical results for heavy metals, should be obtained from the supplier before use in regulated packaging. The user is responsible for verifying finished article compliance because processing aids, printing inks, lamination adhesives, and masterbatches introduce additional chemical exposure. The product is not intended for medical implant applications, and no USP Class VI or ISO 10993 biocompatibility testing is supplied with the standard grade.

Pellets should be stored at ambient temperatures below 40°C, protected from direct sunlight and condensation. Pre-drying is generally not required when the original packaging remains intact; if exposure to relative humidity above 60% has occurred, drying at 70–80°C for 2–4 hours may be performed with a desiccant bed or hot-air hopper dryer. The resin should not be combined with incompatible metal stearate packages above 1500 ppm because die-lip plate-out and smoke generation may increase during extended film runs. All processing and warehousing staff should consult the Safety Data Sheet before handling hot granules or purging equipment with polyolefin purge compounds.