| HS Code | 584021 |
| Grade | DFDA-7042 |
| Polymer Type | Linear Low Density Polyethylene (LLDPE) |
| Density | 0.918–0.922 g/cm³ |
| Melt Flow Rate | 2.0 ± 0.3 g/10 min (190°C/2.16 kg) |
| Comonomer | 1-Butene |
| Tensile Yield Strength | ≥8 MPa |
| Tensile Strength At Break | ≥12 MPa |
| Elongation At Break | ≥500% |
| Dart Impact Strength | ≥80 g |
| Haze | ≤15% |
| Melting Point | 120–125°C |
| Vicat Softening Point | ≥90°C |
| Low Temperature Brittleness | ≤ -70°C |
| Processing Method | Blown film extrusion |
| Processing Temperature | 160–220°C |
As an accredited Linear Low Density Polyethylene LLDPE DFDA-7042 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | LLDPE DFDA-7042 is supplied in 25 kg polyethylene-lined woven bags, stacked on pallets for transport. |
| Container Loading (20′ FCL) | 20′ FCL loaded with 25 kg bags of LLDPE DFDA-7042, palletized, shrink-wrapped, strapped, and secured for ocean transport. |
| Shipping | LLDPE DFDA-7042 is shipped as solid pellets in 25 kg woven bags or 500–1,000 kg jumbo bags, palletized and wrapped. Store in a dry, ventilated area away from heat, sunlight, and moisture; handle carefully to avoid bag damage. Not classified as dangerous goods for transport. |
| Storage | Store LLDPE DFDA-7042 in a cool, dry, well-ventilated warehouse away from direct sunlight, heat, ignition sources, and incompatible materials. Keep containers or bags closed, palletized, and protected from moisture, dust, and contamination. Avoid prolonged high temperatures and open flames; use good housekeeping and static-control measures. Follow the manufacturer’s SDS and local regulations for safe storage. |
| Shelf Life | LLDPE DFDA-7042 is stable; stored cool, dry, and ventilated away from direct sunlight, its shelf life is typically about 24 months. |
Where blown-film converters replace LDPE-rich formulations for heavy-duty logistics packaging, DFDA-7042 is dry-blended at 60–85 wt% with LDPE film resin having a melt index of 0.2–0.75 g/10 min, and a slip/antiblock masterbatch is dosed at 1.5–3.0 wt% to control blocking under winder compression. The applicable compliance framework for food-contact logistics liners is FDA 21 CFR 177.1520(c) for olefin polymers, EU Regulation 10/2011, and GB 9685-2016 for additive migration limits. On a single-screw extruder with L/D 30:1, barrier screw, and spiral mandrel die gap of 1.8–2.4 mm, melt temperature is maintained at 175–210 °C, blow-up ratio is set at 2.0–3.0, and frost line height is adjusted to 3–5 die diameters to balance bubble stability and dart impact. If pellet storage relative humidity exceeds 60%, surface condensation is removed by pre-drying at 80 °C for 2 h before hopper loading. Terminal product types include FIBC liner film, agricultural chemical inner liners, compression sacks for bulk powders, and heavy-gauge industrial bin liners. Published data for this specific configuration is limited at output rates above 180 kg/h on a 90 mm extruder; industrial trials indicate that die-lip melt fracture may occur when screw speed exceeds 95 rpm unless a fluoroelastomer processing aid is dosed at 0.5–1.0 wt%.
Cast stretch film converters running DFDA-7042 at 65–85 wt% with a metallocene plastomer at 10–25 wt% and a tackifier masterbatch at 2–5 wt% produce films in the 12–25 µm range with measurable elongation retention after 100% pre-stretch on power pre-stretch carriages. The relevant regulatory basis includes FDA 21 CFR 177.1520(c), EU Regulation 10/2011, and REACH Regulation (EC) 1907/2006 Annex XVII restrictions applicable to hydrocarbon tackifier residues. Process stability on a L/D 30:1 cast line requires melt temperature of 220–260 °C, die gap of 0.5–0.8 mm, air gap of 10–20 mm, and chill roll temperature of 15–25 °C. Below 15 °C chill roll temperature, film blocking at the primary nips increases; above 260 °C, oxidative gel formation becomes visible after 4 h of continuous operation. Terminal products include machine pallet wrap, hand stretch film, agricultural bale wrap, and pre-stretched bundling film. The operational boundary is draw resonance at line speeds above 400 m/min; because DFDA-7042 is a butene-copolymer LLDPE with lower melt strength than octene grades, converters typically reduce die gap to 0.45 mm or increase metallocene plastomer content to 25 wt% rather than attempting to exceed 450 m/min on older extrusion lines without closed-loop gauge averaging.
Three-layer greenhouse films using DFDA-7042 in the core and outer skins are formulated at 70–85 wt% DFDA-7042, 10–20 wt% LDPE, and a UV/HALS masterbatch at 3–6 wt%; anti-drip concentrate is added at 1–2 wt% only in the inner layer. Compliance for long-life mulch and greenhouse films is assessed under EN 13206:2017 for covering films, with accelerated weathering by ISO 4892-2:2013 cycle 1A and tensile retention measured according to ISO 527-3:2018 after 6000 h of xenon arc exposure. The blown-film line uses a three-layer die with 2.0–2.4 mm die gap, melt temperature of 180–200 °C, blow-up ratio of 2.8–3.8, and bubble cooling air temperature of 10–18 °C to prevent bubble sag in warm greenhouses. Terminal products include 12-month greenhouse cladding film, low-tunnel mulch film, and three-layer silage cover film. In production-scale continuous runs, pigment and UV masterbatch dispersion is verified on 40 µm film using ASTM F1249 water vapor transmission rate testing; poor dispersion appears as localized thickness bands on the back-to-back winder. Published data for greenhouse film containing DFDA-7042 beyond 3-year northern-climate exposure is limited.
| Application segment | Primary compliance standard | Critical test method | Operational boundary |
|---|---|---|---|
| Heavy-duty sacks and FIBC liners | FDA 21 CFR 177.1520(c) | ASTM D1709-16a | Screw speed above 95 rpm on a 90 mm extruder may initiate melt fracture without processing aid at 0.5–1.0 wt% |
| Cast stretch film | EU Regulation 10/2011 | ASTM D1894-14 | Draw resonance may initiate above 400 m/min line speed |
| Agricultural greenhouse film | EN 13206:2017 | ISO 4892-2:2013 | Xenon arc exposure beyond 6000 h without tensile retention data |
| VFFS frozen food film | FDA 21 CFR 177.1520(c) | ASTM F1921-18 | Hot-tack loss above 115 °C with erucamide slip above 2000 ppm |
| Injection moulded crates and bins | GB 4806.7-2016 | ASTM D1693-15 | Wall thickness below 1.2 mm not recommended at 2.0 g/10 min melt flow rate |
At vertical form-fill-seal speeds above 80 bags/min, converters producing 40–80 µm blown film for frozen vegetable pouches and snack packaging run DFDA-7042 at 70–85 wt% with 10–20 wt% LDPE and a high-slip/antiblock masterbatch at 1.0–2.0 wt% to maintain coefficient of friction below 0.25 on horizontal form-fill-seal jaw faces. The formulation falls within FDA 21 CFR 177.1520(c) and EU Regulation 10/2011, with specific migration limits for slip additives verified under EU 10/2011 Annex II and GB 9685-2016. Extrusion is performed on a three-layer blown-film line with L/D 30:1 extruders, die gap of 1.5–2.0 mm, melt temperature of 175–205 °C, blow-up ratio of 2.2–2.8, and internal bubble cooling with exhaust air set to 8–15 °C. Terminal products include VFFS frozen food pouches, snack laminating webs, and lidding film base layers. The critical seal boundary is hot-tack initiation temperature measured by ASTM F1921-18: DFDA-7042 formulations with erucamide slip additive loadings above 2000 ppm show a measurable loss in hot-tack strength above 115 °C, which shifts packaging machine dwell time and can increase leaker rates on vertical form-fill-seal lines running above 80 bags/min.
In injection moulding plants replacing LDPE-rich houseware compounds, DFDA-7042 is run at 50–80 wt% with HDPE or LDPE and a slip/antistatic masterbatch at 1–2 wt%; the target is environmental stress crack resistance in moulded crates and stackable storage bins rather than thin-wall flow. The relevant compliance matrix includes FDA 21 CFR 177.1520(c) for food-contact articles, EU Regulation 10/2011, and GB 4806.7-2016 for food-contact plastic materials. Processing uses a reciprocating screw injection moulding machine with L/D 20:1 to 22:1, barrel zones from 180 °C at the feed throat to 220–240 °C at the nozzle, mould surface temperature of 20–35 °C, injection pressure of 80–110 MPa, and hold pressure of 50–70 MPa. Terminal product types include industrial crates, stackable bins, tote lids, and thick-walled caps; wall thickness below 1.2 mm is not recommended due to the resin's 2.0 g/10 min melt flow rate at 190 °C under 2.16 kg. Production-scale failure observations on 250-ton machines show short shots in thin hinge areas when mould temperature drops below 20 °C; raising nozzle temperature above 240 °C triggers surface oxidation streaks after 20 min of residence time.
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Linear low density polyethylene LLDPE DFDA-7042 is a butene-1 comonomer, Ziegler-Natta catalysed, film-grade polyolefin resin. The grade is specified with a melt-flow index of 1.8–2.2 g/10 min measured at 190°C under 2.16 kg load according to ASTM D1238-20 Procedure A or ISO 1133-1:2022 Condition E, and a base density of 0.918–0.922 g/cm³ determined by ASTM D1505-18 or ISO 1183-2:2019 Method D. Typical conversion routes include monolayer blown film, cast film, and skin layers in coextruded structures where a balance of puncture resistance, seal initiation, and drawdown is required. The product is produced in gas-phase fluidized-bed reactors; the butene comonomer generates short-chain branches that interrupt the linear polyethylene backbone and reduce crystalline order relative to high-density grades.
The molecular architecture of DFDA-7042 differentiates it from high-pressure LDPE. High-pressure LDPE contains long-chain branching and a broader molecular weight distribution, whereas DFDA-7042 carries a predominantly linear backbone with short-chain branch populations distributed along the chain. This structural difference is reflected in film mechanics: the butene-LLDPE grade typically achieves higher dart-drop impact values at 50 µm gauge, but lower melt elasticity and lower bubble stability in blown-film processing. No single numerical comparison is absolute because additive packages and extrusion conditions shift the balance. Published data for this specific configuration is limited; the values cited in this document are indicative commercial ranges rather than specification limits.
For food-contact or electrical/electronic applications, converter verification is required against FDA 21 CFR 177.1520 and, where applicable, EU RoHS Directive 2011/65/EU because additive packages may contain boundary substances. The resin supplier safety data sheet contains REACH registration and CLP classification data for the monomer and additive set delivered at each production location.
In blown-film trials on a 45 mm single-screw extruder with a barrier screw and L/D 25:1, bubble stability is maintained when die gap is set at 1.5–2.0 mm, blow-up ratio is held at 2.0:1–2.5:1, and melt temperature is limited to 190–210°C. Under these conditions, a 50 µm film typically exhibits dart impact falling between 90–120 g when tested by ASTM D1709-21 Method A. The corresponding high-pressure LDPE film of similar melt index and density may fall in the 70–90 g range. The improvement arises primarily from the higher tie-chain fraction produced by short-chain branching during lamellar crystallization; butene branches do not enter the orthorhombic crystallite and concentrate in the amorphous interlamellar regions. The resulting amorphous phase absorbs energy without the rapid crack propagation observed under dart impact.
Elmendorf tear resistance is direction dependent. At 50 µm gauge, machine-direction tear strengths reported in commercial data range from 120–170 gf by ASTM D1922-15, while transverse-direction tear strengths range from 200–280 gf. High-pressure LDPE often exhibits higher machine-direction tear but lower transverse-direction tear due to more isotropic orientation. Processors replacing LDPE with DFDA-7042 in bag applications generally shift film gauge downward by 10–15% to maintain equivalent drop-impact performance; however, this substitution reduces bubble stability and requires lower haul-off ratios.
Cast film processing of DFDA-7042 at die gaps of 0.8–1.0 mm is carried out at melt temperatures from 220–250°C. The lower melt strength of the butene-LLDPE grade relative to LDPE increases neck-in and reduces drawdown stability on high-speed chill-roll lines. Typical neck-in on a 1.2 m die set at 0.9 mm gap can be 15–25% greater than that of an equivalent melt-index LDPE; this requires edge trim adjustment or deckling changes. The cast film exhibits lower optical haze than blown film, with haze values from 3–6% at 50 µm measured by ASTM D1003-13. Coefficient of friction without slip additive is typically above 0.50; addition of erucamide at 500–1,000 ppm reduces static coefficient of friction to 0.10–0.25 after migration, but migration kinetics in polymer matrices require 24–72 h at 23°C before stable values are recorded.
DFDA-7042 is often blended with high-pressure LDPE in ratios of 70:30 to 80:20 to improve bubble stability in monolayer blown-film lines. Addition of LDPE at 20–30 wt% raises melt strength and reduces film haze by 2–5 percentage points, but lowers dart impact by 10–20%. The blend is supplied as dry-blended pellets and requires a mixing section in the extruder screw to avoid compositional surging. Single-screw extruders without a Maddock or pineapple mixing element are not recommended for dry blends above 30% LDPE because unmelted LDPE-rich domains create optical gels and thickness bands.
Indicative commercial data for DFDA-7042, a high-pressure LDPE film grade of similar melt index, and a hexene-1 C6-LLDPE are compared in the following table. Values are not specification limits; they represent typical ranges reported for monolayer blown film processed at 50 µm, blow-up ratio 2.5:1, die gap 1.6 mm.
| Parameter | Test method | DFDA-7042 | HP-LDPE | C6-LLDPE |
|---|---|---|---|---|
| Melt-flow index | ASTM D1238-20 | 1.8–2.2 g/10 min | 2.0–2.4 g/10 min | 1.8–2.2 g/10 min |
| Density | ASTM D1505-18 | 0.918–0.922 g/cm³ | 0.922–0.925 g/cm³ | 0.916–0.920 g/cm³ |
| Dart impact | ASTM D1709-21 Method A | 90–120 g | 70–90 g | 180–220 g |
| Elmendorf tear MD | ASTM D1922-15 | 120–170 gf | 180–240 gf | 220–300 gf |
| Elmendorf tear TD | ASTM D1922-15 | 200–280 gf | 160–220 gf | 300–400 gf |
| Haze | ASTM D1003-13 | 10–15 % | 6–10 % | 6–9 % |
| Gloss 45° | ASTM D2457 | 45–60 | 60–75 | 65–80 |
| Secant modulus MD 1% | ASTM D882-18 | 170–200 MPa | 150–190 MPa | 150–180 MPa |
The hexene-1 C6-LLDPE comparison shows the effect of comonomer length on tie-chain formation. The butene branch in DFDA-7042 is shorter and less efficient at increasing impact toughness than the hexene branch at equivalent density; the C6 grade demonstrates markedly higher dart impact and tear values but generally has a lower melt-flow ratio and higher extruder back pressure. For applications requiring moderate abuse resistance and lower extruder head pressure, DFDA-7042 may be selected. For aggressive puncture or freezer applications, a switch to a C6 or C8 grade is required, and an extruder clean-out of 2–4 h should be scheduled to avoid melt-index drift.
In agricultural film and heavy-duty sack formulations, DFDA-7042 is compounded with 2.5–4.0 wt% carbon black masterbatch or 8–12 wt% white masterbatch. The shear viscosity at 100 s−1 and 190°C is reported to range from 700–900 Pa·s; this limits extruder torque on lines with undersized drives. Extruder barrel zones are typically profiled from 180°C at the feed throat to 210°C at the adapter, with screen packs of 60/80/100 mesh to trap agglomerates. Excessive back pressure above 35 MPa has been associated with localized melt-temperature rise and gel formation in long-run campaigns. A breaker plate with 20% open area is advised when adding high-letdown concentrates to reduce dead spots.
UV stabilization is mandatory for outdoor exposure. Unstabilized DFDA-7042 film retained less than 50% of initial elongation after 1,200 h of QUV-B cycling per ASTM G154; addition of hindered amine light stabilizer packages at 0.15–0.30 wt% extends that threshold beyond 3,500 h. The exact lifetime depends on geographic irradiance and film gauge; published data for this specific configuration is limited.
Three-layer agricultural and heavy-duty film lines place DFDA-7042 in the core or sealant layer with HDPE skins to raise modulus and moisture barrier. The rheological mismatch between HDPE and butene-LLDPE must be controlled by using melt temperatures of 200–230°C for both layers. Viscosity crossover at typical shear rates can cause layer encapsulation if the viscosity ratio exceeds 3:1. Interlayer instability appears as cloud-like gauge bands; correction requires adjustment of the die temperature profile or a reduction of skin-layer output by 10–15%.
Adhesion between HDPE and DFDA-7042 is generally acceptable without tie resin when melt contact is maintained at a coextrusion feedblock temperature of 230°C; however, delamination tests by ASTM F88/F88M-21 on sealed packaging show that seal initiation temperature for DFDA-7042-containing sealant layers is 100–110°C, 10–15°C lower than HDPE sealant films. The lower seal initiation arises from the lower melting peak of the butene-LLDPE crystalline fraction. For hot-fill applications above 95°C, HDPE skin layers are required because DFDA-7042 alone softens and loses seal integrity.
Processing lines with elevated dew points present an additional constraint. At relative humidity above 60%, pellet surfaces can adsorb moisture sufficient to create microfoam and surface roughness; pre-drying in a desiccant hopper at 70°C for 2 h is recommended before extrusion. If the resin is stored in outdoor silos above 40°C, the stabilizer package can migrate to pellet surfaces over 6–12 months, reducing protection during film production; inventory rotation is therefore limited to 12 months from the certificate of analysis date.
