Inner Mongolia Baofeng LLDPE DFDA7042H
- Product Name: Inner Mongolia Baofeng LLDPE DFDA7042H
- Factroy Site: Yudu County, Ganzhou, Jiangxi, China
- Price Inquiry: admin@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
- CONTACT NOW
- Inner Mongolia Baofeng LLDPE DFDA7042H is typically used in formulations when melt flow index and density and melt temperature and blow-up ratio must be controlled within specific ranges.
| HS Code | 263629 |
| Polymertype | Linear Low-Density Polyethylene (LLDPE) |
| Comonomer | Butene-1 |
| Density | 0.920 g/cm³ |
| Meltflowrate | 2.0 g/10 min (190°C/2.16 kg) |
| Tensilestrengthatyield | ≥8 MPa |
| Tensilestrengthatbreak | ≥17 MPa |
| Elongationatbreak | ≥500% |
| Dartimpactstrength | ≥80 g |
| Tearstrengthmd | ≥60 kN/m |
| Tearstrengthtd | ≥80 kN/m |
| Haze | ≤12% |
| Gloss | ≥60% |
| Vicatsofteningpoint | ≥90°C |
| Meltingpoint | 120-125°C |
| Brittlenesstemperature | ≤-70°C |
| Coefficientoffriction | 0.15-0.25 |
| Filmthickness | 0.02-0.10 mm |
As an accredited Inner Mongolia Baofeng LLDPE DFDA7042H factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 25 kg PP woven bags or 1000 kg jumbo bags; store in a cool, dry, ventilated area. |
| Container Loading (20′ FCL) | 20′ FCL: 25kg bags; 25MT loose or 20MT palletized; dry, sealed, moisture-protected, secure container for Inner Mongolia Baofeng LLDPE DFDA7042H. |
| Shipping | Inner Mongolia Baofeng LLDPE DFDA7042H is shipped as non-hazardous thermoplastic pellets in 25 kg bags or 1000 kg jumbo bags, palletized and containerized. Store dry, away from heat and sunlight. Standard sea, rail, and truck transport; 20' FCL loads about 20–25 MT. Moisture-sensitive; avoid contamination. |
| Storage | Store Inner Mongolia Baofeng LLDPE DFDA7042H in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, moisture, and ignition sources. Keep original bags sealed and palletized to prevent contamination, dust, and moisture ingress. Avoid contact with strong oxidizers. Do not expose to rain. Maintain clean handling areas and follow the manufacturer’s SDS for safe storage and shelf life. |
| Shelf Life | Typically 12 months from production date when stored in original packaging, dry, ventilated conditions, away from direct sunlight and moisture. |
Where DFDA7042H is charged as the base polymer on agricultural film lines, the resin is dry-blended with 10–30 wt% LDPE and 5–20 wt% metallocene LLDPE to suppress neck-in and stabilize the bubble at blow-up ratios above 2.5:1. Nominal melt-flow rate is 2.0 g/10 min under ASTM D1238 and density is 0.918–0.922 g/cm³ under ISO 1183. In silage and greenhouse covering lines, die gaps are typically set at 1.8–2.5 mm, die diameters between 250 mm and 500 mm, and melt temperatures are held within 190–215 °C; internal bubble cooling is used when output exceeds 250 kg/h to maintain frost line height at 8–12 die diameters. The formulation for ultraviolet-stable greenhouse film includes a HALS masterbatch at 3–8 wt% as supplied, corresponding to 0.1–0.4 wt% active hindered amine; omission of the HALS package results in tensile elongation retention below 50% after 2000 h of accelerated weathering under ISO 4892-2, whereas properly stabilized film retains above 80%. Compliance for agricultural and horticultural covering films is assessed against EN 13206 and for silage films against EN 13207, with mechanical test methods including ISO 527-3 for tensile yield and elongation, ASTM D1709 for dart drop, and ASTM D1922 for Elmendorf tear. Production-scale bottleneck data show that bubble instability at BURs above 3.0:1 becomes acute with 100% DFDA7042H unless the melt temperature is raised above 210 °C; conversely, cooling too rapidly at frost line heights below 6 die diameters increases haze and reduces transverse direction tear. The converted film is slit and wound as greenhouse covering film, low-tunnel film, silage bale wrap, and soil-contact mulch film, with silage wrap requiring a minimum elongation at break of 400% in the machine direction and a dart impact value above 800 g for 100 µm film.
What Limits Draw Resonance in Cast Stretch Film Converting of DFDA7042H?
On cast film lines producing pallet-wrap, draw resonance and neck-in are governed by the air-gap distance and the chill-roll temperature. In this segment, DFDA7042H is blended at 60–80 wt% with 15–30 wt% C6 or C8 metallocene LLDPE and 0.5–2.0 wt% polyisobutylene tackifier; slip and antiblock masterbatch loadings remain below 0.2 wt% to preserve cling. The web is extruded through a slot die with lip gap 0.5–0.9 mm, quenched on a chill roll at 15–25 °C, and drawn at line speeds from 300 m/min to 600 m/min, with pre-stretch ratios on downstream wrapping equipment reaching 200–300%. Process conflicts at the die-to-chill-roll gap are material-specific: air gap below 10 mm freezes film too rapidly and increases orientation anisotropy, while air gap above 50 mm decreases neck-in but amplifies draw resonance, so converters typically operate an air gap of 15–35 mm for DFDA7042H-rich blends. In machine-grade film, the DFDA7042H fraction is reduced to 55–70 wt% and a high-density component is added at 5–10 wt% to raise puncture resistance. Compliance measurements follow ASTM D882 for tensile strength and elongation, ASTM D5458 for cling, and ASTM D5748 for stretch film puncture; REACH 1907/2006 applies to imported film for EU-bound shipments. Production-scale observation: edge trim recycling above 15% of total throughput increases gel count and causes draw resonance at line speeds above 450 m/min, so converters limit edge trim re-feed to 10–12%. The principal finished forms are hand stretch film from 12 µm to 20 µm, machine stretch film from 17 µm to 30 µm, and cast stretch hood film in the 80–150 µm range. Published data for the exact DFDA7042H concentration where draw resonance begins is limited; the operational window above is derived from industrial film-line trials with similar C4 LLDPE grades.
When Linear-Low Density Replaces LDPE in Heavy-Duty Sack Film Structures
A three-layer heavy-duty sack line running DFDA7042H in the core and inner sealing plies uses the resin at 65–80 wt% in both layers, diluted with 20–35 wt% LDPE to maintain seal bar forgiveness. The outer abuse layer carries 25–40 wt% HDPE, 40–55 wt% LDPE, and 10–20 wt% DFDA7042H to lift secant modulus and hot-tack threshold. Typical die gaps are 1.4–2.2 mm, die diameters 300–600 mm, blow-up ratios 2.0:1–2.8:1, and melt temperatures 200–230 °C. The extruder configuration on such lines is usually a 30:1 L/D barrier screw with spiral mandrel die and internal bubble cooling; output per die circumference is held below 1.2 kg/h/mm to avoid melt fracture. Surface treatment is set to 38–42 dyn/cm to ensure adhesion of labels and anti-skid coatings. For industrial packaging of mineral fillers, the filled sack generally requires a dart drop value above 1000 g for 200 µm film and an Elmendorf tear above 800 gf in the machine direction under ASTM D1922; mechanicals are measured under ISO 527-3 and ASTM D882. In FIBC liner applications, the film is folded and sealed into tubular liners; compliance for the finished flexible intermediate bulk container is set by ISO 21898, and the liner film itself is assessed under ASTM D1709 and ASTM D1894 coefficient of friction. Operational limitation: when HDPE is increased above 40 wt% in the outer ply, the melt viscosity mismatch produces waviness at the die lip and reduces transverse tear strength below acceptable limits; conversely, below 25 wt% HDPE, stack compression resistance declines. End-product types include 25 kg chemical sacks, mineral powder sacks, FIBC inner liners, and asphalt/rosin-filled valve sacks.
In adhesive lamination structures, DFDA7042H is converted as a 25–60 µm sealant web and bonded to BOPP, PET, or aluminium foil with solventless polyurethane adhesive applied at 1.5–2.5 g/m²; the sealant layer is frequently diluted with 10–20 wt% LDPE to reduce sealing temperature and with 0.05–0.15 wt% slip additive to control machinability. For food-contact use, the olefin polymer component must comply with FDA 21 CFR 177.1520 and EU 10/2011, including specific migration limits for the additives; converter documentation must include a Declaration of Compliance listing the exact masterbatch chemistry, because not all slip packages meet the same migration restrictions in fatty-food simulants. Cast-web production uses a slot die with lip gap 0.6–1.0 mm and chill-roll temperature 18–25 °C; blown-web production runs at die gap 1.6–2.0 mm and blow-up ratio 2.0:1–2.5:1. Seal performance is measured by ASTM F88 seal strength and ASTM F1921 hot tack; industrial data place the seal initiation temperature of DFDA7042H-based webs in the range 90–110 °C, although published data for this specific configuration is limited and the exact seal initiation should be established on the converting line because polyethylene seal initiation is influenced by seal bar pressure, dwell time, and web thickness. Operational limitation: excess slip agent above 0.2 wt% migrates to the lamination interface and reduces adhesive bond strength below 1.0 N/15 mm on metallized films. End-product types include stand-up pouches, side-gusset pouches, frozen food pouches, and lap-seal sachets.
| Control Parameter | Referenced Standard | Typical Acceptance Range |
|---|---|---|
| Olefin polymer compliance | FDA 21 CFR 177.1520 | Conformance to extractives limits |
| Overall migration in food simulants | EU 10/2011 | 10 mg/dm² maximum |
| Seal strength | ASTM F88 | 1.0–4.0 N/15 mm |
| Hot-tack force | ASTM F1921 | Machine-dependent, typically 0.5–2.0 N/25 mm |
| Cast web gauge variation | ISO 4593 | ±5% of nominal |
Refuse Sack Monolayer Extrusion and Post-Consumer Recyclate Loading
When post-consumer recyclate is included in refuse sack formulations, DFDA7042H is fed as the primary resin at 60–80 wt%, with 10–30 wt% LDPE and 10–20 wt% post-consumer recyclate; carbon black masterbatch is added at 2–5 wt% for opacity and UV protection, and a process stabilizer masterbatch at 0.5–1.5 wt% counters the acid-catalyzed oxidation that imported post-consumer recyclate can introduce. The line configuration is typically a high-output monolayer or tandem three-layer blown film extruder with die diameter 200–800 mm, die gap 1.2–2.4 mm, blow-up ratio 2.0:1–3.0:1, and melt temperature 180–210 °C; internal bubble cooling and gauge control via segmented air ring are used above 300 kg/h to maintain thickness variability below ±5%. For household waste sacks, EN 13592 sets minimum tear and dart requirements, while ISO 527-3 and ASTM D1709 are used for routine lot release; the film must also meet the substance restrictions under REACH 1907/2006, while packaging waste heavy-metal limits are set by EU Packaging Directive 94/62/EC. When post-consumer recyclate is incorporated, incoming feedstock is screened for zinc and residual compost contamination to prevent pinholes. Production-scale failure mode: at recyclate levels above 20 wt%, gel dispersion becomes inconsistent on 30:1 L/D single screws, producing pinhole rates above 0.5 defects/m² in film below 25 µm; melt filtration at 100–150 µm screen aperture reduces film breaks but raises backpressure by 15–25%. The finished articles include drawstring household refuse sacks from 20 µm to 70 µm, institution liners for high-density waste streams, and sacks for clinical waste where the converted structure is classified under the relevant national medical waste regulation.
Controlling Differential Slip in Cast Coextruded Protection Film
For surface protection film, DFDA7042H is extruded as the base layer at 70–90 wt% with 10–30 wt% LDPE; the coextruded cling layer is an EVA or polyolefin plastomer with vinyl acetate content 14–28%, applied at 5–15 µm thickness. The cast line uses a slot die with lip gap 0.5–0.9 mm, chill-roll temperature 15–25 °C, and line speeds 100–400 m/min; the base side is corona-treated to 36–42 dyn/cm where printing or external adhesive coating is required. Peel adhesion is measured under ASTM D3330 or ISO 29862, with 180° peel values controlled between 0.05–2.0 N/25 mm depending on substrate roughness and end-use handling. Regulatory requirements include REACH 1907/2006 and RoHS 2011/65/EU, particularly for films applied to exported consumer durable goods; the formulation avoids heavy-metal pigments and intentionally added phthalates. Operational boundary: raising DFDA7042H above 90 wt% in the base layer reduces machine-direction tear strength during manual stripping, while LDPE above 30 wt% softens the film enough to cause blocking after wound storage at pressures above 2 kPa. The finished forms include temporary protection film for aluminium profiles, coated steel and aluminium sheet, plastic glazing, furniture panels, and stainless steel appliance surfaces.
Competitive Inner Mongolia Baofeng LLDPE DFDA7042H prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8618136850665 or mail to admin@ascent-chem.com.
We will respond to you as soon as possible.
Tel: +8618136850665
Email: admin@ascent-chem.com
Get Free Quote of Ascent Petrochem Holdings Co., Limited
Flexible payment, competitive price, premium service - Inquire now!
- Inner Mongolia Baofeng LLDPE DFDA7042H is manufactured under an ISO 9001 quality system and complies with relevant regulatory requirements.
- COA, SDS/MSDS, and related certificates are available upon request. For certificate requests or inquiries, contact: admin@ascent-chem.com.
Designated as a butene-1 linear low density polyethylene film resin manufactured by gas-phase polymerisation, Inner Mongolia Baofeng LLDPE DFDA7042H is supplied for blown-film converters producing thin-gauge general-purpose packaging. The grade is built around a nominal melt mass-flow rate of 2.0 g/10 min measured at 190 °C under 2.16 kg following ISO 1133-1:2022, and a nominal base density of 0.918 g/cm³ determined by ISO 1183-1:2019. The H suffix appears in the producer nomenclature for a film-optimised variant; its exact effect must be verified against the certificate of analysis because suffix definitions can reflect additive package, melt-index adjustment, or plant line identification rather than a universal specification. The combination of moderate melt flow and low density places the resin in the standard LLDPE film segment used for carrier bags, garment overwrap, liners, and agricultural film where drawdown, puncture resistance, and sealability are required.
Nominal Property Ranges and Test Designations
Published producer data for DFDA7042-class grades provide the ranges in Table 1. These values are not a substitute for lot-specific certificates; they represent class-typical control windows used in commercial release testing.
| Property | Nominal value or limit | Test method |
|---|---|---|
| Melt mass-flow rate at 190 °C/2.16 kg | 1.7–2.3 g/10 min | ISO 1133-1:2022, ASTM D1238 |
| Density at 23 °C | 0.917–0.921 g/cm³ | ISO 1183-1:2019, ASTM D1505 |
| Tensile stress at yield, blown film | ≥8.0 MPa | ISO 527-3, ASTM D882 |
| Tensile strain at break, blown film | ≥500% | ISO 527-3, ASTM D882 |
| Dart drop impact F50, 25 µm blown film | Producer certificate required; published class data for DFDA7042 film grades varies with film line and frost line | ASTM D1709 |
Because the grade is a Ziegler-Natta catalysed butene copolymer, lot-to-lot variation in comonomer incorporation can shift density and melt index within the release window. Converters producing heat-seal films should track density because published film-sealing data indicate that a density change of 0.001 g/cm³ can shift seal initiation temperature by 1–2 °C in monolayer structures. The melt flow ratio is not typically controlled as a release specification, but a broad molecular weight distribution improves shear thinning during screw pumping and reduces motor torque relative to metallocene grades of similar melt index.
How Does Butene-1 Comonomer Content Alter Tear and Dart Impact Relative to Hexene-Grade LLDPE?
Butene-1 incorporation produces ethyl branches distributed along the ethylene backbone. Hexene-based LLDPE introduces butyl branches. At equivalent melt index and density, the longer butyl branch in hexene copolymers is more effective at interrupting crystallisable sequence length, which increases the probability of tie molecules connecting adjacent lamellae. The consequence is a measurable gap in Elmendorf tear and falling-dart impact between DFDA7042H-class butene grades and hexene or octene film resins under ASTM D1922 and ASTM D1709 testing.
Temperature-rising elution fractionation reveals a broader short-chain branching distribution in conventional Ziegler-Natta butene resins. The broader distribution can widen the heat-seal window but may reduce ultimate dart impact relative to metallocene grades with narrower composition distribution. In processing, butene incorporation lowers the differential scanning calorimetry melting peak to approximately 122–126 °C for a density of 0.918 g/cm³; the exact peak is lot-dependent and should not be used as a release limit.
Compared with high-pressure low-density polyethylene of the same 0.918 g/cm³ density, DFDA7042H has a linear or lightly branched backbone and lower melt strength. Blown-film lines designed for LDPE often require wider die gaps and lower blow-up ratios when switching to DFDA7042H because the LLDPE melt exhibits less strain hardening and higher shear viscosity at typical output rates.
When Die Gap Falls Below 1.8 mm, Bubble Stability and Melt Fracture Limits Interact
On conventional low-pressure blown-film lines, die gaps below 1.8 mm raise shear stress at the die lip. DFDA7042H at 190–210 °C can approach the critical shear stress for sharkskin melt fracture when throughput becomes aggressive; published data for this specific configuration is limited because die geometry, land length, and melt temperature dominate the onset condition. The recommended die gap for this grade is 1.8–2.5 mm. A narrower gap may be tolerated only with elevated die temperatures and a polished die lip free of ceramic coating defects.
Bubble stability is governed by blow-up ratio and frost line height. At blow-up ratios above 3.0:1, gauge variation increases unless air-ring venturi and internal bubble cooling are balanced. At blow-up ratios below 2.0:1, bubble stiffness declines, and trapped-air pressure fluctuations produce edge curl or bubble wander. The practical operating window for DFDA7042H lies at 2.0:1–3.0:1 for monolayer film between 20 µm and 80 µm. Melt temperature should not exceed 220 °C for prolonged residence times; above 240 °C, gel specks from oxidative degradation can appear in the film, particularly on low-purge lines with long adapters.
Blown-Film Extruder Configuration, Barrel Profiles, and Frost Line Control
Extruders with 25:1–30:1 L/D barrier screws and Maddock mixing sections are preferred. Barrel temperatures from feed to die are typically set at 170 °C, 180 °C, 190 °C, 200 °C, and 210 °C; the exact profile should be adjusted to keep melt temperature below the degradation threshold. Grooved-feed sections improve solids conveying, but excessive groove depth can generate premature shearing heat and require lower feed-zone temperatures.
For melt filtration, screen packs of 60/80/100 mesh increase backpressure and improve melt homogeneity. Excessive backpressure can raise melt temperature and reduce output; the limit is extruder-specific and cannot be transferred from one line to another. A dual-lip air ring with a venturi gap of 1–2 mm is commonly used to stabilise the bubble. Insufficient air velocity causes bubble breathing and gauge bands, while excessive velocity freezes the bubble too close to the die and increases film haze.
Frost line height is normally held at 3–7 die diameters. Lower frost line improves optics but reduces machine-direction tear resistance because orientation freezes more rapidly. Higher frost line increases transverse direction shrinkage and lowers dart impact in some structures. The selection of 2.0:1–3.0:1 blow-up ratio and the use of internal bubble cooling determines whether output is limited by melt fracture, motor amperage, or bubble cooling; on many lines, cooling capacity is the limiting factor before melt fracture appears.
In 40 µm monolayer heavy-gauge liners, DFDA7042H retains tensile strain at break above 500% because the butene branching lowers crystallinity and permits yield before failure. Seal performance is measured by heat-seal initiation temperature; the grade is employed in form-fill-seal lines where seal bar temperatures of 115–135 °C are typical, but the exact range depends on seal pressure, dwell time of 0.3–0.8 s, and film gauge. Converters using corona treatment target surface energy of 38–42 mN/m for lamination or printing; treatment levels decay with time and require inline verification by ISO 8296 test inks. For applications requiring puncture resistance, the film should be tested with ASTM D5748; published data for this specific configuration is limited and should be generated on the target line.
Differentiation from Low-Density Polyethylene and Metallocene LLDPE in Converter Operations
Against high-pressure LDPE, DFDA7042H shows higher dart impact and tensile strength at equivalent thickness because the short-chain branching in LLDPE produces a more linear backbone than the long-chain branching of LDPE. Melt strength is lower, which narrows the bubble stability window on equipment lacking internal bubble cooling. LDPE remains preferred for high-stalk film, extrusion coating, and foamed structures where high elongational viscosity is required.
When metallocene LLDPE is compared with DFDA7042H, the Ziegler-Natta resin shows a broader molecular weight distribution and lower dart impact at equal density. Gel permeation chromatography of conventional Ziegler-Natta LLDPE typically shows a polydispersity index in the 3–5 range, whereas metallocene grades are often 2–3. The Ziegler-Natta catalyst system produces higher extractables than some metallocene grades, and optical clarity under ASTM D1003 is typically lower. The processing advantage of DFDA7042H appears as lower motor torque and lower melt pressure in single-screw extruders because the broad distribution promotes shear thinning. Metallocene grades may be selected when hot-tack strength, low seal initiation temperature, and high dart impact are critical.
Hexene- or octene-based LLDPE grades occupy the upper tier of toughness for film resin. For the same melt index and density, hexene and octene grades provide higher Elmendorf tear and higher dart impact, but butene grades often retain a cost advantage and exhibit adequate performance in light-duty film. The converter should specify the test standard and film gauge when comparing data sheets; ASTM D1709 dart impact values obtained on 25 µm film cannot be directly compared with values from 50 µm film.
The base resin is evaluated under EU Regulation 10/2011, FDA 21 CFR 177.1520, and GB 4806.7-2016 for food contact applications. Because antioxidants, slip agents, antiblock agents, and processing aids added by the converter are part of the final article, migration testing must be performed on the finished package. Under REACH, the resin is a polymer substance; monomers and additives are subject to registration, and the converter must verify SVHC content below 0.1% w/w for finished-article communication duties. The resin should be stored in unopened containers below 40 °C, protected from direct sunlight and ultraviolet exposure; prolonged outdoor storage can increase gel formation and reduce film appearance. At ambient relative humidity above 80%, surface moisture should be removed before processing because water droplets in the feed throat create gauge bands and bubble instability.
| Regulatory instrument | Base polyethylene status | Converter obligation |
|---|---|---|
| EU Regulation 10/2011 | Ethylene and butene-1 monomers listed | Overall migration and specific migration tests on final article |
| FDA 21 CFR 177.1520 | Olefin polymer class for food contact | End-use conditions and food type determine allowable use |
| GB 4806.7-2016 | Polyethylene food contact material scope | Total migration, sensory, and consumption limitations |
For shipment acceptance, lot-specific certificates of analysis remain the controlling document. If no published data are available for a given application, converter trials on the target line are required because die design, air ring geometry, downstream haul-off speed, and cooling air temperature alter the processing window beyond what a resin data sheet can predict. No single set of processing conditions or film properties can be transferred from one extrusion line to another without verification under ISO 527-3 or ASTM D882 for mechanical performance.
