PetroChina Lanzhou KunLun mLLDPE mPE1018

Heavy-Duty Sack Film Extrusion and Bubble Stability Limits

PetroChina Lanzhou KunLun mPE1018 is a metallocene linear low-density polyethylene with a nominal melt index of 1.0 g/10 min measured at 190 °C under 2.16 kg load according to ISO 1133-1:2022 and a nominal density of 0.918 g/cm³ measured by ISO 1183-1:2019. In heavy-duty sack film extrusion, this grade is run on three-layer coextrusion blown film lines equipped with 75 mm and 65 mm grooved-feed extruders at L/D 30:1, barrier screws with mixing pins, and a 300 mm diameter die with a 1.8 mm lip gap. Barrel zone settings are typically 180 °C, 195 °C, 205 °C, 210 °C, and 210 °C, with adapter and die temperatures between 200 °C and 220 °C. The melt temperature must be held within a ±5 °C window because temperatures above 225 °C reduce melt strength and induce draw resonance, while temperatures below 185 °C raise die pressure and promote sharkskin melt fracture. The bubble is run at a blow-up ratio of 2.2:1 to 3.0:1, with frost line height between 500 mm and 800 mm. On a 300 mm die, output is commonly kept between 180 kg/h and 230 kg/h. Above 240 kg/h, bubble flutter and melt fracture onset become line-specific and require a fluoroelastomer polymer processing aid masterbatch at 0.02 wt% to 0.06 wt%. Pre-drying is not required below 60% RH; if pellets are exposed to humidity above 80% RH for more than 24 hours, hopper drying at 80 °C for 1 hour is used to prevent feed-throat moisture surging.

For sack film thicknesses from 120 µm to 200 µm, converters frequently blend mPE1018 with 10 wt% to 25 wt% of high-pressure LDPE film resin having a melt index of 0.25 g/10 min to 0.5 g/10 min. The LDPE fraction increases melt strength and reduces low-frequency bubble oscillation, but it lowers dart impact relative to 100% mPE1018. At 150 µm thickness on a 300 mm die line with frost line height above 600 mm, the blend generally still exceeds 800 g in dart impact measured by ISO 7765-1 method A. Tensile properties are tested according to ISO 527-3, tear propagation according to ISO 6383-2, and seal strength according to ASTM F88/F88M. Terminal sacks are used for 25 kg and 50 kg packaging of fertilizers, polymer resins, petrochemical granules, and agricultural commodities. Quality plans commonly specify a 50 kg filled bag drop height of 1.2 m for at least 5 drops without catastrophic seal or film rupture. Published data for mPE1018 in 50 kg valve bags under tropical humidity cycling is limited; therefore the drop test is validated on the converting line for each batch.

The central processing conflict is the relationship between dart impact improvement and bubble stability loss at high mPE1018 content. At 80 wt% mPE1018 in an LDPE blend, bubble flutter is usually manageable at 2.5:1 BUR, but at 100 wt% mPE1018 the same die may show low-frequency oscillation below 3 Hz when the frost line exceeds 700 mm. This is not a material failure but a rheological response to the absence of long-chain branching and the narrow molecular weight distribution of metallocene polyethylene. Lines equipped with internal bubble cooling and automatic iris control permit higher output because cooling air velocity can be adjusted within ±0.5 m/s to stabilize the frost line. In such configurations, silica anti-block at 0.3 wt% to 0.8 wt% and polymer processing aid at approximately 400 ppm are used to lower die pressure and prevent roll blocking after winding. Batch-to-batch melt index variation is typically low in metallocene grades, but die pressure and motor load should still be monitored to detect lot-to-lot shifts before they affect film gauge uniformity.

When Agricultural Greenhouse Film Requires 24-Month Weathering Retention

Agricultural greenhouse structures use three-layer blown film with mPE1018 in the outer and middle layers at total thicknesses of 180 µm to 220 µm and layflat widths from 6 m to 12 m. The outer layers are generally compounded with 65 wt% to 70 wt% mPE1018, 15 wt% to 20 wt% LDPE with melt index 0.25 g/10 min, 8 wt% to 10 wt% UV masterbatch based on hindered amine light stabilizer and triazine UV absorber, 3 wt% to 5 wt% EVA with vinyl acetate content 14 wt%, and 1 wt% to 2 wt% anti-drip concentrate. The middle layer carries the anti-fog package at 2 wt% to 3 wt% and uses 60 wt% to 65 wt% mPE1018 with 20 wt% to 25 wt% EVA. On a 1.6 m die with rotating ring and 1.8 mm die gap, melt temperature is controlled between 200 °C and 210 °C, BUR from 2.5:1 to 3.2:1, and frost line height from 700 mm to 1000 mm. Output on a 1600 mm die typically falls between 450 kg/h and 550 kg/h. Initial tensile properties are tested per ISO 527-3. Weathering retention is evaluated after 3000 h in ISO 4892-2 cycle 1 at 0.76 W/m² at 340 nm and 60 °C black standard temperature. Industrial specifications often require elongation at break retention above 70%, but published data specific to mPE1018 after 24-month field exposure in high-altitude solar radiation is limited.

The lifespan risk in greenhouse film is photodegradation at fold lines where the film contacts the galvanized steel frame. Iron ions at these contact points accelerate oxidation; therefore installers specify a polyethylene foam tape between the frame and the film. When the film is in service for two seasons, the anti-drip package in the middle layer can migrate to the inner surface and become depleted. Converters address this by increasing middle-layer anti-fog concentrate from 2 wt% to 3 wt% and by keeping middle-layer melt temperature below 210 °C. Thermal degradation of nonionic surfactants above this temperature shortens anti-drip persistence. Tensile strength retention after 24 months is evaluated at the greenhouse ridge rather than the sidewalls because ridge film receives the highest cumulative UV dose. The film is used as greenhouse covering, low tunnel, and transit protection in horticultural supply chains where mechanical toughness must be balanced against ultraviolet stabilizer loading. Excessive UV stabilizer above 10 wt% in the outer layer can reduce interlayer adhesion and create delamination under wind fatigue, so masterbatch dosage is verified by Fourier-transform infrared spectroscopy on the finished film before field shipment.

What Governs Heat Seal Integrity in mLLDPE Sealant Webs Under High-Speed Pouch Lines?

Cast coextruded sealant webs based on mPE1018 are used in flexible food packaging as the sealing layer in three-layer and five-layer laminates. The sealant layer is typically 15 µm to 30 µm thick and contains 85 wt% to 100 wt% mPE1018, 0.3 wt% to 0.5 wt% synthetic silica anti-block, and 0.05 wt% to 0.15 wt% erucamide slip, with the remainder being LDPE or EVA depending on seal temperature requirements. On a coextrusion cast line with a slot die gap of 0.8 mm, melt temperature is maintained between 220 °C and 245 °C, and the chill roll is held at 18 °C to 25 °C to limit crystal growth and preserve low seal initiation temperature. The metallocene comonomer distribution narrows the differential scanning calorimetry melting endotherm per ISO 11357-3. Heat seal initiation measured by ASTM F88/F88M on a 25.4 mm wide specimen sealed at 2 bar for 0.5 s typically falls between 95 °C and 105 °C. This is approximately 10 K to 15 K lower than conventional C4-LLDPE sealant grades of equal density, allowing pouch line sealing jaw temperatures to be reduced without sacrificing seal strength.

Food-contact compliance is established through 21 CFR 177.1520(c) Table 1 for polyolefins and through Commission Regulation (EU) No 10/2011 with overall migration limit below 10 mg/dm² under the selected food simulant. The final laminate must be tested for specific migration of erucamide and silica anti-block because EU 10/2011 Annex II assigns specific migration limits to these additives. Residual monomer and non-intentionally added substances assessment under EU 10/2011 Article 19 is required for the complete package. On vertical form-fill-seal lines running at 80 cycles/min to 120 cycles/min, seal dwell time is less than 0.1 s, so the resin must have low seal initiation temperature and high hot tack strength. Hot tack is measured by ASTM F1921 or ISO 23559, and production specifications commonly set hot tack force above 4 N/15 mm at 110 °C for a 25 µm layer laminated to 12 µm PET. Seal bar pressure is maintained at 2 bar to 3 bar, with jaw temperature profiling adjusted to avoid burn-through in the gusset fold area.

Compliance parameter	Standard or regulation	Condition or limit
Melt index	ISO 1133-1:2022	1.0 g/10 min, 190 °C, 2.16 kg
Density	ISO 1183-1:2019	0.918 g/cm³
US food contact	21 CFR 177.1520(c) Table 1	Polyolefin moisture barrier and sealant use
EU overall migration	EU 10/2011 Annex III	< 10 mg/dm²
Specific migration	EU 10/2011 Annex II	Additive-specific SML
Seal strength	ASTM F88/F88M	N/25 mm, 2 bar, 0.5 s dwell
Hot tack	ASTM F1921	> 4 N/15 mm at 110 °C

Compliance parameter

Standard or regulation

Condition or limit

Melt index

ISO 1133-1:2022

1.0 g/10 min, 190 °C, 2.16 kg

Density

ISO 1183-1:2019

0.918 g/cm³

US food contact

21 CFR 177.1520(c) Table 1

Polyolefin moisture barrier and sealant use

EU overall migration

EU 10/2011 Annex III

< 10 mg/dm²

Specific migration

EU 10/2011 Annex II

Additive-specific SML

Seal strength

ASTM F88/F88M

N/25 mm, 2 bar, 0.5 s dwell

Hot tack

ASTM F1921

> 4 N/15 mm at 110 °C

In extrusion lamination of woven polypropylene and multi-wall paper sacks, a coating layer based on mPE1018 is applied at 12 µm to 25 µm thickness to function as a moisture barrier and sealable surface. The coating is extruded through a T-slot die with a die gap of 0.8 mm onto a primed or corona-treated substrate at melt temperatures from 280 °C to 315 °C. Because the melt index of 1.0 g/10 min is low for high-speed coating, converters blend 30 wt% to 50 wt% of an LDPE extrusion coating grade with melt index 6 g/10 min to 8 g/10 min to reduce draw resonance and control neck-in. The chill roll is maintained at 12 °C to 18 °C, and nip pressure is set at 3 bar to 4 bar to achieve peel adhesion above 3 N/15 mm when tested by TAPPI T540 or ASTM D903. Bond strength to woven polypropylene fabric is sensitive to the oxygenated melt surface; the air gap is therefore kept between 150 mm and 250 mm to allow oxidation before the resin contacts the substrate. Line speed on a 1200 mm coating line typically ranges from 80 m/min to 180 m/min. Terminal uses include fertilizer and cement bags, paper-plastic combinations, and agricultural chemical packaging. Moisture vapour transmission rate through the 20 µm coating layer is determined per ISO 2528 using the cup method at 38 °C and 90% RH, but published data specific to mPE1018 in woven sack lamination is limited.

Pallet unitization stretch hood films with nominal thickness from 80 µm to 120 µm are produced on cast film lines with die widths of 1200 mm to 1800 mm and an air gap of 20 mm to 40 mm. The formulation uses 75 wt% to 85 wt% mPE1018, 10 wt% to 15 wt% EVA with vinyl acetate content 12 wt% to 18 wt%, 2 wt% to 5 wt% polyisobutylene cling masterbatch, and 0.5 wt% to 1.5 wt% silica anti-block. Melt temperature at the die is controlled between 235 °C and 245 °C, and the chill roll is held at 18 °C to 25 °C to promote rapid solidification. The film is monoaxially oriented by the stretching hood machine at elongation between 60% and 80% after the pallet is covered. Puncture resistance is tested by ISO 7765-1 method A on 100 µm film, and tensile properties are measured by ISO 527-3. Cling performance is evaluated using ASTM D5458 peel cling, with production targets typically above 2.5 N/25 mm after 24 hours at 23 °C and 50% RH. The metallocene backbone of mPE1018 increases film toughness at high elongation rates, which reduces corner splitting when the film stretches over sharp pallet corners in automated logistics lines. Surface slip must be balanced against cling because excessive anti-block above 1.5 wt% reduces holding force on the pallet and can cause load shift during transport.

When frozen seafood packaging requires a sealant and outer web with dart impact retention at -30 °C, blown film structures based on mPE1018 are processed at thicknesses of 60 µm to 100 µm and a BUR of 2.5:1 to 3.5:1. The formulation combines 70 wt% to 80 wt% mPE1018 with 10 wt% to 20 wt% EVA containing 18 wt% vinyl acetate and 5 wt% to 10 wt% LDPE to keep gel levels low. On a 200 mm die with 1.6 mm die gap, the melt temperature is maintained at 190 °C to 205 °C and the frost line height at 500 mm to 700 mm. Low-temperature puncture properties are measured by ISO 7765-1 after conditioning films for 48 h at -30 °C, and tear resistance by ISO 6383-2. The film is used for frozen shrimp, fish fillet, and ice cream liners where seal integrity must survive repeated cold storage cycles and rough handling in cold chain distribution. Converters specify anti-fog concentrate in the inner layer at 1 wt% to 2 wt% to prevent water condensation on the package after removal from frozen storage. Published data for mPE1018 under repeated freeze-thaw cycles from -30 °C to 23 °C is limited; final package validation is conducted on the actual cold chain route with controlled leakage testing after shipping.

PetroChina Lanzhou KunLun mLLDPE mPE1018 is a metallocene-catalyzed linear low-density polyethylene resin manufactured by PetroChina Lanzhou Petrochemical Company and sold under the KunLun resin portfolio. The grade is identified as a pelletized mLLDPE film resin with a nominal melt mass-flow rate of 1.0 g/10 min at 190 °C and 2.16 kg and a nominal density of 0.918 g/cm³. These two values place mPE1018 in the low-density film segment, but its molecular architecture differs fundamentally from high-pressure LDPE and conventional Ziegler-Natta LLDPE. The metallocene catalyst system produces a narrow molecular weight distribution and a more uniform short-chain branching distribution. In film applications this results in lower seal initiation temperature, higher hot-tack strength, improved dart impact relative to film stiffness, and reduced extractable fractions when the resin is used in food-contact structures. The grade is directed toward monolayer and coextruded blown film, cast film, lamination sealant webs, frozen food packaging, collation shrink film, silage film, and heavy-duty sacks. The property set also makes the resin suitable as a high-impact modifier in blends with conventional C4-LLDPE or C8-LLDPE, where it can reduce seal initiation temperature without replacing the entire polymer layer in existing extrusion lines.

The product designation “mPE1018” is the commercial grade code; the prefix mPE indicates metallocene polyethylene, and the numerical suffix is the producer’s internal sequence code. Procurement documents should reference “Lanzhou KunLun mLLDPE mPE1018” and request the lot-specific certificate of analysis because catalyst lot and pelletizer conditions can cause minor variation in pellet size distribution, bulk density, and additive concentration. Compared with high-pressure LDPE film resins, mPE1018 has lower melt strength, which limits maximum stalk height in blown film but improves dart impact and Elmendorf tear at equal thickness. Compared with conventional Ziegler-Natta LLDPE of the same density and MFR, the metallocene grade shows lower seal initiation temperature, higher hot-tack force, lower extractable fraction, and a narrower processing window. The main operational difference is higher extruder head pressure and greater bubble sensitivity caused by the narrower molecular weight distribution.

What Physical Property Set Defines mPE1018 and How Is the Material Measured?

Table 1 lists typical physical property ranges for mPE1018 and the corresponding test standards. The values are compiled from producer technical literature and from typical industrial metallocene LLDPE film-grade data for resins of equivalent melt flow rate and density. They are not a specification unless stated in the producer’s certificate of analysis.

Table 1. Typical physical property ranges for PetroChina Lanzhou KunLun mLLDPE mPE1018
Property	Typical value or range	Test method
Melt mass-flow rate, 190 °C, 2.16 kg	1.0 g/10 min	ISO 1133-1:2022
Density	0.918 g/cm³	ASTM D1505
Peak melting temperature, 10 °C/min	119–123 °C	ISO 11357-3
Tensile stress at yield, Type 1B	8.0–11.0 MPa	ISO 527-2
Elongation at break, Type 1B	>600%	ISO 527-2
Dart impact, 40 µm film	110–150 g	ASTM D1709A
Haze, 40 µm film	8–12%	ASTM D1003
Elmendorf tear, MD / TD	22–28 N/mm / 25–32 N/mm	ASTM D1922

For film property comparisons, specimen preparation matters. Dart impact values are strongly influenced by die gap, blow-up ratio, frost line height, and cooling air temperature. The range shown in Table 1 is not a minimum specification; it reflects the typical operating window for a 40 µm film produced at a 2.5:1 blow-up ratio and 1.6 mm die gap. A narrower die gap or a higher frost line may shift dart impact upward but can degrade gauge uniformity at high output rates.

During start-up on a 45 mm grooved-feed single-screw extruder with 30:1 L/D and a 150 mm spiral mandrel die, the melt pressure at the breaker plate rises by approximately 18–30% relative to a conventional 1.0-MFR Ziegler-Natta LLDPE of the same density. This behavior arises from the narrower molecular weight distribution and lower shear-thinning sensitivity of the metallocene resin, not from degraded melt quality. The effect is most visible in the first 30–45 min after dry-run start-up, when screw speed and barrel temperature setpoints are changed simultaneously. If the feed throat is very cold, surface condensation on pellets entering from outdoor silo storage can generate momentary pressure spikes. Hopper drying at 60 °C for 2 h is applied when pellet surface moisture is visible or when storage relative humidity exceeds 65%. The observed pressure increase is a processing constraint on older extrusion lines with pressure transducers rated below 40 MPa. In such cases, the melt pump speed is reduced or the screen pack is opened from 60/80/100 mesh to 40/60/80 mesh to keep the adapter pressure within alarm limits.

Melt Pressure, Die Gap, and Bubble Stability in Low-Density Metallocene Film Lines

Process variable selection for mPE1018 is more constrained than for a broad-molecular-weight LDPE. The recommended melt temperature at the die lip is 190–195 °C for blown film. Barrel zone setpoints in the feed section are kept at 170–180 °C to avoid premature pellet melting before the compression zone; compression and metering zones are set at 190–200 °C. A die temperature below 175 °C produces a visible sharkskin surface pattern because the metallocene resin does not generate the high-molecular-weight tail that masks sharkskin in broad-MWD LDPE. A die temperature above 205 °C can increase odor and trigger bubble sag in thin-gauge films. The narrow processing window requires die temperature control better than ±5 °C and a blow-up ratio held within 2.0–2.8. Outside this blow-up range, film impact values decline because transverse orientation no longer balances machine-direction draw; the effect is measurable as a reduction in machine-direction tear below 20 N/mm while transverse tear increases disproportionately.

Bubble stability is primarily a function of cooling air velocity and frost line height. On a 150 mm die operating with a 1.6 mm die gap and 2.5:1 blow-up ratio, a frost line height of 1.5–2.0 times the die diameter improves dart impact. A frost line below 1.0 times the die diameter reduces crystallinity at the nip and increases blocking tendency in low-haze grades. Cooling air velocities above 3.5 m/s in single-lip air rings cause the bubble to oscillate because the low melt strength of the 1.0-MFR resin cannot resist high-frequency aerodynamic loading. Production-scale difficulties observed with mPE1018 in this configuration include asymmetric stalk diameter when die centering is off by more than 0.05 mm, gauge scatter of ±10% at 20 µm, and intermittent blocking at the collapsing frame if film surface temperature exceeds 45 °C.

The extruder specification that provides the greatest operational advantage is a barrier screw with a Maddock mixing section rather than a general-purpose three-zone screw. The barrier flight separates solid and melt phases, reducing shear heating and allowing specific throughput rates of 0.9–1.1 kg/h per mm of screw diameter without exceeding a melt temperature of 220 °C. A grooved feed section improves output consistency with pellet bulk-density variation, but the groove depth should not exceed 2.5 mm for a 45 mm screw because deeper grooves transmit excessive torque into low-temperature pellets.

When mPE1018 Is Let Down into a Ziegler-Natta LLDPE Blend

mPE1018 is frequently used as a modifier at 20–30 wt% in conventional C4-LLDPE or C8-LLDPE blown film formulations to reduce seal initiation temperature and improve dart impact without switching the entire film structure to a pure metallocene resin. Dry blending in low-shear ribbon blenders at ambient temperature is sufficient for pellet homogenization. However, the blend viscosity mismatch can cause localized melt-pressure cycling in extruders with short transition sections. The metallocene fraction melts earlier than the higher-molecular-weight Ziegler-Natta component, producing melt-quality stratification that appears as alternating haze bands unless the screw is equipped with a dispersion section. The recommended strategy is to use a barrier screw with an axial mixing pin section or a static mixer before the die.

At 20 wt% mPE1018, seal initiation temperature measured on a laboratory heat sealer at 0.5 N/mm² pressure and 1 s dwell typically falls by 3–5 °C relative to the base Ziegler-Natta LLDPE. At 30 wt%, the reduction can reach 6–8 °C, but the melt pressure may increase by 12–20% depending on the base resin’s melt flow rate. For a base resin with an MFR of 0.8 g/10 min, the 30 wt% blend can require screw speed reductions of 5–10% to maintain an adapter pressure below 35 MPa on a 75 mm extruder. This is a critical threshold because higher additions may deliver improved seal performance but reduce throughput on extrusion lines with fixed motor torque limits. Published data for this specific configuration is limited; the values given are typical ranges from industrial blending studies, not producer-guaranteed behaviour for all C4-LLDPE grades.

In coextruded film structures, mPE1018 is placed in the sealant skin layer at a layer ratio of 10–20% of total film thickness, typically 4–8 µm in a 40 µm total gauge. The resin’s lower seal initiation temperature permits a faster packaging machine sealing cycle because the dwell time can be shortened by 0.2–0.4 s compared with a Ziegler-Natta LLDPE skin at the same temperature setpoint. However, the optical contribution of the skin layer is limited; total film haze is dominated by core layer selection, so mPE1018 is rarely added solely for clarity. In high-speed vertical form-fill-seal packaging, the hot-tack force of mPE1018-based sealant webs at 120 °C and 100 mm/s sealing speed is sufficient to hold package contents during the drop cycle, but the exact hot-tack value must be verified with a J&B or Mocon hot-tack tester using the production film gauge. Failure to hold the hot-tack specification is more commonly caused by back-seal contamination from slip additives than by the metallocene resin itself.

In cast film, mPE1018 is processed through a 75 mm extruder with a 2.4 m flat die and chill roll temperature of 18–22 °C. The low melt strength can induce draw resonance at draw ratios above 30:1 when the air gap exceeds 150 mm; reducing the air gap to 80–120 mm and raising the melt temperature to 195–200 °C stabilizes the web. At 25 µm thickness, neck-in on a standard flat die is typically 8–12% when melt temperature is above 190 °C; the neck-in is higher than for LDPE but lower than for Ziegler-Natta LLDPE of similar MFR. This behavior influences edge trim generation and web width control on cast film lines. For extrusion lamination, mPE1018 is applied at coating weights of 15–25 g/m² on aluminium foil or PET. The low seal initiation improves bond at lower melt temperature and allows lamination at 280–300 °C compared with LDPE at 310–320 °C; however, the melt strength is insufficient for draw-down below 10 g/m² without web breaks.

For food-contact packaging, mPE1018 is covered by the producer’s olefin polymer certification under 21 CFR 177.1520, subject to extractive limitations in the regulation. When the resin is used in contact with fatty foods or in high-temperature applications, migration testing under the EN 1186 series or ISO 1186 is conducted on the final film structure, not on the pellet alone. The resin is outside the EU RoHS 2011/65/EU restricted substance categories and is REACH-registered under EC 1907/2006 as an industrial polymer; specific additive residues are declared in the safety data sheet. mPE1018 should not be used in medical implant grade or pharmaceutical primary packaging applications without additional biocompatibility data, because the product is not sterilisation-grade and additive packages are not formulated for steam autoclave or gamma irradiation at doses above 25 kGy.

Additive incompatibility boundaries include high-acid ionomer scrap above 10 wt%, which raises melt elasticity and can destabilize the bubble in thin-gauge film, and free-amine-based slip/antiblock masterbatches that may adsorb to metallocene catalyst residues and produce surface haze even after dispersion. The approved additive strategy is a non-amine erucamide slip at 500–1,000 ppm with silica antiblock at 1,500–3,000 ppm, adjusted on the basis of film gauge and reel-to-reel blocking tests under 45 °C storage.

HS Code	243195
Productname	PetroChina Lanzhou KunLun mLLDPE mPE1018
Manufacturer	PetroChina Lanzhou Petrochemical Company
Brand	KunLun
Grade	mPE1018
Polymertype	Metallocene linear low-density polyethylene (mLLDPE)
Form	Pellets
Density	0.918 g/cm³
Meltindex	1.0 g/10 min (190°C/2.16 kg)
Meltingpoint	118 °C
Vicatsofteningpoint	95 °C
Tensilestrengthatbreak	≥25 MPa
Elongationatbreak	≥500%
Dartimpactstrength	≥90 g
Haze	≤16%
Gloss	≥60
Application	Blown film, packaging film, heavy-duty film, frozen food packaging

Packing	Supplied in 25 kg net woven bags with PE inner liner, palletized for bulk shipment.
Container Loading (20′ FCL)	A 20-foot FCL container is loaded with PetroChina Lanzhou KunLun mLLDPE mPE1018 bags, stowed, secured, and sealed for export shipment.
Shipping	PetroChina Lanzhou KunLun mLLDPE mPE1018 is supplied in 25 kg PE-lined PP woven bags, palletized and shrink-wrapped. It ships as a non-hazardous polymer in dry 20′ containers, protected from moisture, sunlight, and contamination; store in a cool, dry, ventilated area.
Storage	Store in a cool, dry, well-ventilated warehouse away from direct sunlight, heat sources, moisture, and incompatible chemicals. Keep original bags closed and palletized; avoid dust generation and static buildup. Observe good housekeeping and fire precautions, do not exceed recommended stacking heights, protect from contamination and physical damage, and use first-in-first-out stock rotation.
Shelf Life	Shelf life: typically 24 months from manufacture when stored cool, dry, ventilated, and in unopened packaging.

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