ExxonMobil Exceed XP mLLDPE XP 8346PA
- Product Name: ExxonMobil Exceed XP mLLDPE XP 8346PA
- Factroy Site: Yudu County, Ganzhou, Jiangxi, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- ExxonMobil Exceed XP mLLDPE XP 8346PA is typically used in formulations when film toughness, puncture resistance, and seal performance and melt temperature, die pressure, and film gauge must be controlled within specific ranges.
| HS Code | 978571 |
| Polymer Type | Metallocene Linear Low Density Polyethylene (mLLDPE) |
| Density | 0.934 g/cm3 |
| Melt Index 190 C 2 16 Kg | 0.50 g/10 min |
| Peak Melting Point | 123 °C |
| Vicat Softening Point | 100 °C |
| Tensile Strength At Yield | 11 MPa |
| Tensile Strength At Break | 38 MPa |
| Elongation At Break | 500 % |
| Flexural Modulus | 290 MPa |
| Dart Drop Impact | 500 g |
| Elmendorf Tear Strength Md | 300 g |
| Elmendorf Tear Strength Td | 400 g |
| Haze | 5 % |
| Gloss 45 | 80 |
As an accredited ExxonMobil Exceed XP mLLDPE XP 8346PA factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ExxonMobil Exceed XP mLLDPE XP 8346PA is supplied in 25 kg moisture-resistant, polyethylene-lined bags, palletized for industrial handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL containing 25-kg bags of ExxonMobil Exceed XP mLLDPE XP 8346PA, palletized, stretch-wrapped, and secured for ocean transport. |
| Shipping | ExxonMobil Exceed XP mLLDPE XP 8346PA is shipped as non-hazardous polyethylene resin pellets in sealed 25 kg bags or octabins. Store in a cool, dry, well-ventilated area away from direct sunlight, moisture, and ignition sources. No special transport classification is required; protect packaging from damage. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, flames, and oxidizing agents. Keep material in original, closed packaging on pallets to prevent moisture pickup and contamination. Avoid prolonged outdoor exposure and excessive stacking. Observe good housekeeping and local regulations; consult the SDS for detailed handling and storage guidance. |
| Shelf Life | Typically 24 months from date of manufacture when stored unopened in original packaging, dry, cool, and away from direct sunlight. |
On a three-layer blown film line with a 90 mm main extruder, L/D 30:1 barrier screws and a 2.4 mm die gap, ExxonMobil Exceed XP 8346PA at nominal 0.934 g/cm³ density (ASTM D1505) and melt index 1.0 g/10 min (ASTM D1238-20 at 190°C/2.16 kg) is processed into heavy-duty sack webs at 80–140 µm gauge. The extruder barrel profile is set in five zones from 180°C to 215°C, with die temperature maintained at 210°C ± 5°C. Melt pressure before the screen pack is typically 360–420 bar at 150 kg/h; if the pressure exceeds 460 bar, melt-temperature homogeneity degrades and the web begins to show shark-skin streaks at the frost line. The narrow molecular weight distribution of mLLDPE produces less pronounced shear thinning than LDPE, so motor load and torque rise steeply above 90 rpm. The bubble is stabilized with a dual-lip air ring and internal bubble cooling using chilled air at 8–12°C. A blow-up ratio of 2.2:1 to 2.8:1 is preferred; above 3.0:1, transverse direction gauge variation measured by a capacitance gauge widens from ±3% to ±6%. The main failure mode in sack production is not ductile rupture but tear propagation along a fold line adjacent to the sewn seam, so machine-direction Elmendorf tear resistance is monitored under ASTM D1922 at a minimum of 20 N/mm for 100 µm film. Dart impact by ASTM D1709 Method A is frequently specified above 250 g for 100 µm sacks to survive drop tests under ISO 7965-2. Because the grade has a density above typical mLLDPE sealants, the film exhibits higher tensile modulus and better handling, but the bubble is less tolerant of tower turbulences and requires side shields on lines running above 1,800 mm layflat width.
Why Does Gauge Uniformity Deteriorate Above a 3.0:1 Blow-Up Ratio in Heavy-Duty Sack Film?
At 0.934 g/cm³, the melt crystallizes at a higher temperature than 0.918 g/cm³ film grades; the onset of solidification occurs earlier as the bubble travels from the die. When the blow-up ratio is increased above 3.0:1, the circumference of the bubble expands while the die-to-frost-line distance often shortens under the same chilled-air load. This creates non-uniform draw in the transverse direction. On a 2,400 mm layflat line, gauge profiles measured with an automated scanning head show low spots near the creases and heavier edges. The standard deviation of transverse gauge can increase from 2–3 µm at 80 µm nominal to 5–7 µm when BUR passes 3.0:1 and frost line is held below 600 mm from the die. The defect is not corrected by die-gap adjustment alone; the die gap must be widened from 2.0 mm to 2.6 mm or internal bubble cooling air flow must be raised by 15–20%. Specific energy consumption on a 90 mm extruder at 150 kg/h should remain between 0.18 kWh/kg and 0.24 kWh/kg; values above 0.26 kWh/kg indicate excessive shear heating that destabilizes bubble cooling because the melt exits the die with a surface temperature above 225°C. This creates a direct processing conflict: higher melt temperature improves melt strength and dart impact but narrows the bubble-temperature window. The operational window for 8346PA in this gauge is therefore bounded by a melt-temperature band of 205°C to 220°C and a BUR below 2.9:1. Operators who raise temperature to eliminate melt fracture at high screw speed often trigger gauge bands near the weakest bubble sector, which is typically opposite the tower exhaust.
Sealant layer evaluation for frozen food flexible laminates uses ASTM F1921 hot-tack and ASTM F2029 heat-seal strength on laboratory sealers with 0.5 N/mm² seal pressure, 0.5 s dwell and 10°C step increments. For an 80 µm sealant film of 0.934 g/cm³ mLLDPE, hot-tack onset is typically observed between 95°C and 110°C depending on die temperature and cooling rate. The sealant layer is laminated to 12 µm polyester or 15 µm biaxially oriented polyamide; in this configuration the sealant must survive -30°C impact without flex cracking. Flex resistance is screened by ASTM F392 Gelbo test at 10–100 cycles; pinhole counts above 5 per 300 cm² after 50 cycles typically trigger a downgauging review. Most frozen food converters specify a minimum seal strength of 15 N/25 mm by ASTM F88 after 0.3 s dwell at 120°C. Because Exceed XP 8346PA has a narrow molecular weight distribution, seal-through-contamination behavior differs from LDPE; the seal plateau is flatter but the lower melt strength can produce pull-in wrinkles at the seal edge when sealing bars are misaligned by more than 0.2 mm. The laminate is also tested for total migration under EN 1186-1 with overall migration below 10 mg/dm²; resin compliance is assessed per 21 CFR 177.1520(c) 2.1 for olefin polymers intended for food contact.
When an mLLDPE Sealant Layer Replaces LDPE in Frozen Food Laminates
The substitution of LDPE with Exceed XP 8346PA in the sealant web alters both sealing and flex-crack resistance. LDPE sealant layers typically seal at 115–125°C but lose hot-tack rapidly above 130°C. In contrast, the mLLDPE sealant reaches 80% of ultimate seal strength at 105°C and maintains a broader sealing plateau to 140°C. This broader plateau permits packaging machine speeds up to 120 pouches/min on vertical form-fill-seal equipment with 0.1 s seal dwell. The penalty is lower melt strength in the blown film process, so the sealant web is usually coextruded as the inside layer of a three-layer film where a core layer of 15–20% HDPE or high-molecular-weight LDPE provides bubble stability. The tie layer between sealant and barrier is a maleic anhydride-grafted polyolefin at 8–12 µm; the adhesive bond must exceed 3 N/15 mm after 85°C hot-water immersion for 30 min when tested per ASTM F904. In frozen food, flex-crack resistance of the formed pouch is more critical than seal initiation. Films based on 0.934 g/cm³ mLLDPE show lower pinhole formation than LDPE-rich webs after 50 Gelbo cycles at -20°C, but the improvement is lost if the sealant layer falls below 40 µm. At 30 µm sealant thickness, pinhole counts can double when the web is creased under the same flex test. This defines the operational boundary for downgauging.
| Compliance or performance area | Standard or code | Numerical limit or condition |
|---|---|---|
| US resin food-contact status | FDA 21 CFR 177.1520(c) 2.1 | May be used with aqueous, acidic, fatty and dry foods up to 100°C; no migration limit for olefin polymer |
| EU overall migration | EN 1186-1 | 10 mg/dm² |
| 1-Hexene comonomer specific migration | EU 10/2011 Annex I | 3 mg/kg |
| Heat seal strength | ASTM F88/F88M-20 | Minimum 15 N/25 mm at 0.3 s dwell, 120°C |
| Hot tack range | ASTM F1921 | Peak force tracked from 95°C to 140°C |
Stretch Hood Film: Dart Impact, Tensile Yield, and Cling-Free Holding Force
Stretch hood films produced from 8346PA are blown at layflat widths of 1,800–2,800 mm and thicknesses of 90–150 µm. The application requires high transverse direction tensile yield to hold palletized loads without tackifier. Tensile yield stress is measured by ISO 527-3 on 15 mm-wide strips at 500 mm/min; films at 120 µm typically require transverse yield above 14 MPa and elongation at break above 600%. Dart impact resistance under ASTM D1709 Method A is specified above 300 g for 120 µm film, because puncture during pallet wrapping is the main field failure. Puncture resistance is screened by ASTM D5748 with a 0.75 mm probe; values below 2.5 J at 120 µm generally indicate insufficient elastic recovery after contact with sharp package corners. Unlike cling film, no polyisobutylene or ultra-low-density polyolefin tackifier is added; holding force arises from elastic recovery after stretching. The process uses a collapsing frame with hard-anodized slats; frictional drag must stay below 0.25 N/mm of contact width or the web skips and creates transverse gauge bands. Because 0.934 g/cm³ mLLDPE has higher stiffness than 0.918 g/cm³ stretch film grades, the film shows less neck-in at the edges but lower inherent creep recovery. The practical stretch ratio on a spiral wrapper is 45–65% initial pre-stretch; at 70%, occasional stress-whitening can appear at the gusset fold, indicating local yielding. For pallet loads above 1,200 kg, the film is often upgraded to 130–150 µm and the collapsing frame side guides are adjusted to a gap of 3–5 mm wider than the layflat to avoid edge folding under tension.
What Are the Operational Boundaries for Silage Wrap Coextrusion with 0.934 g/cm³ mLLDPE?
In silage wrap and silage cover films, 8346PA is used in the middle or outer layer of a coextruded structure with a total thickness of 45–60 µm. The main layer is blended with 8–12% carbon black masterbatch or 4–6% TiO₂-based white masterbatch to reduce UV penetration. Processing on a 70 mm single-screw extruder at L/D 24:1 requires a melt temperature below 230°C to prevent thermal decomposition of the hindered amine light stabilizer package, which typically has an onset temperature near 240°C. Backpressure at the screen changer should be maintained between 250 bar and 350 bar; above 400 bar the screen pack is likely blinded by carbon black agglomerates and the film shows gel counts above 10 per m² when inspected against a light table. The film must pass EN 13207 for silage films, including tear resistance and puncture resistance. Machine-direction tear measured by ASTM D1922 in a 50 µm black silage wrap should remain above 12 N/mm to survive wrapping over rough stubble without splitting. Puncture resistance by DIN 53356 or ASTM D5748 is specified at a minimum of 2.0 J for 50 µm. Because the grade contains no added slip agent, the roll unwind friction coefficient can exceed 0.55; converters typically introduce 500–1,000 ppm erucamide or oleamide via masterbatch to bring the dynamic COF below 0.30 measured by ISO 8295. Additive migration takes 24–48 h to stabilize at room temperature, so immediate destacking of slit rolls can cause blocking. The outer layer is often made with 15% LDPE to improve bubble stability; running the line at 2.0:1 BUR and frost line height of 700 mm reduces edge wrinkles and gusset creases. At high line speeds, bubble instability is triggered by wind gusts above 2 m/s across the tower, so enclosed towers or side-guard panels are required for widths above 1,200 mm.
Construction vapor barrier membranes processed from 0.934 g/cm³ mLLDPE are extruded as single-ply or three-layer webs at 150–300 µm. The film is assessed under EN 13984 or ASTM E96 for water vapor transmission rate; at 200 µm, specifications often require WVTR below 0.6 g/m²/day at 23°C and 85% RH. The melt is run at 200–230°C with a 2.0:1–2.5:1 blow-up ratio. The key limitation is low puncture resistance at construction-site seams; impact tests per ASTM D1709 at 200 µm usually require values above 600 g. Recycled post-industrial trim is added at 10–15% to reduce raw material cost; above 20%, gel speck counts and seam strength fall below specification. The film is also checked for tensile properties under EN 12311-2; longitudinal elongation at break must exceed 400% to accommodate building settlement. Because 8346PA has no UV stabilizer, outdoor exposure is limited to 3 months before embrittlement unless the membrane is covered by cladding or insulation.
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- ExxonMobil Exceed XP mLLDPE XP 8346PA 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: sales8@ascent-chem.com.
ExxonMobil Exceed XP mLLDPE XP 8346PA is a metallocene-catalyzed hexene linear low-density polyethylene intended for blown-film and cast-film coextrusion. The published resin data sheet lists a nominal density of 0.926 g/cm³ when measured under ASTM D1505, and a melt index of 0.9 g/10 min when measured under ASTM D1238 at 190 °C/2.16 kg. These values are typical, not batch-release specifications. The resin is supplied as pellets and is generally considered for flexible packaging, heavy-duty sacks, agricultural silage and greenhouse films, and sealant webs. The selection of XP 8346PA over conventional C4-LLDPE is evaluated through production-scale film trials because dart impact, tear propagation, and seal-strength responses depend on die gap, bubble configuration, and downstream converting conditions.
| Property | Test Method | Published Typical Value |
|---|---|---|
| Density | ASTM D1505 | 0.926 g/cm³ |
| Melt index | ASTM D1238, 190 °C/2.16 kg | 0.9 g/10 min |
What Distinguishes XP 8346PA from Conventional C4-LLDPE and Ziegler-Natta Hexene Copolymers?
Three process-relevant differences arise from the metallocene architecture. First, the narrow molecular weight distribution and uniform short-chain branching reduce low-molecular-weight extractable species and improve organoleptic properties relative to traditional Ziegler-Natta LLDPE. Second, the same narrow distribution reduces shear-thinning; at high shear rates the apparent viscosity remains closer to the low-shear value, so extruder head pressure and motor load can be higher than those of a comparable melt-index C4-LLDPE. Third, the comonomer is incorporated more regularly than in conventional linear low-density polyethylene, which increases the stiffness-toughness balance at equivalent density and allows film producers to evaluate downgauging on form-fill-seal and heavy-duty sack lines.
In tensile and tear testing, molecular uniformity does not automatically translate into higher values in every orientation. Machine-direction tear and transverse-direction tear respond differently to bubble geometry and frost-line height. Comparative laboratory films must be conditioned under ASTM D618 and tested under ASTM D882 for tensile properties, ASTM D1922 for Elmendorf tear, ASTM D1709 Method A for dart impact, and ASTM D1003 for haze. Published comparative data for XP 8346PA specifically remain limited; however, resins in the 0.920–0.926 g/cm³ metallocene LLDPE class generally exhibit higher dart impact and lower seal initiation temperature than Ziegler-Natta C4 copolymers at equivalent film thickness.
In blown-film practice, XP 8346PA is processed through barrier screws with length-to-diameter ratios between 24:1 and 30:1 and spiral mandrel dies with die gaps of 1.5 mm to 2.5 mm. Because narrow molecular weight polyethylene is more melt-fracture prone at equivalent melt index, converters routinely add fluoropolymer processing aid at 200–800 ppm and maintain die temperature at 220–230 °C to shift the onset of surface defects. Melt temperature measured at the die lip should not exceed 250 °C to limit oxidative degradation and gel formation. The bubble is typically run at a blow-up ratio of 2.0–3.0, with frost-line height adjusted to balance machine-direction and transverse-direction Elmendorf tear values. In high-stalk and large-bubble operations, straight XP 8346PA may exhibit inadequate bubble stability because of lower melt strength relative to high-pressure LDPE; a blend with 10–30 wt% high-pressure LDPE is common. The LDPE component broadens the processing window but reduces dart impact and increases haze, so final blend validation should include ASTM D1709, ASTM D1922, and ASTM D1003.
Blown-Film Melt-Pressure Boundaries and Extruder Configuration
Production lines running XP 8346PA on grooved-feed extruders require continuous monitoring of specific power input, melt pressure, and melt temperature. At constant screw speed, melt pressure typically runs higher than a conventional C4-LLDPE of identical melt index because of reduced shear-thinning. Plant data for metallocene LLDPE of similar melt index have shown head pressures ranging from 280 bar to 420 bar depending on die gap, output rate, and melt temperature; XP 8346PA-specific data should be verified on the target line. The condition is most evident at output rates above 180 kg/h on a 65 mm barrier screw, where the screen pack and die become the dominant pressure-drop elements. Screen packs using a 100–150 µm media combination are preferred to avoid excessive downstream pressure variation. Startup purging should use an LLDPE or LDPE with a melt index between 1.0 g/10 min and 2.0 g/10 min to reduce die-lip accumulation.
The melt index of 0.9 g/10 min places XP 8346PA in the medium-viscosity blown-film range. Retrofitting an existing line from a conventional C4-LLDPE of similar melt index can require a reduction in output of 5–10% or an increase in melt temperature of 5–10 °C to remain below the onset of melt fracture. These operational adjustments depend on screw design and die gap; they are not resin defects but consequences of the narrower molecular weight distribution. Barrel temperature profiles commonly start at 150–160 °C in the feed throat and ramp to 220–230 °C in the adapter and die zones. Floor-level head pressure alarms should be set at 450 bar on most blown-film dies, but the exact maximum is established by the die manufacturer.
Consequently, blown-film processors should select die gaps at the upper end of the typical range when high stiffness is not the limiting variable. A die gap of 2.0–2.5 mm improves bubble stability and permits higher throughput without surface melt fracture, but it reduces molecular orientation and can lower machine-direction tear under ASTM D1922. The trade-off is best evaluated through a designed experiment that measures Elmendorf tear, dart drop impact under ASTM D1709 Method A, and 1% secant modulus under ASTM D882 on a 25 µm monolayer film. Lot-to-lot melt index and density variation should be tracked from the certificate of analysis because extruder throughput at constant screw speed is melt-index-dependent. Tight lot-to-lot variation is expected with metallocene grades, but changes in additive masterbatch or regrind content can shift head pressure and seal response.
When Heat-Seal Strength, Hot Tack, and Organoleptic Limits Are Evaluated
In packaging lines using form-fill-seal equipment with seal dwell times below 0.5 s, low seal initiation temperature becomes a defining variable. Seal initiation temperature is measured by ASTM F88 or ASTM F1921; published comparative values for XP 8346PA specifically are limited, but metallocene hexene LLDPE in the 0.916–0.926 g/cm³ density class commonly shows seal initiation temperatures between 88 °C and 105 °C at a 25 µm sealant layer. The product should be evaluated on the actual packaging machine because seal bar geometry, dwell time, and cooling rate shift the measured hot tack envelope. Narrow molecular weight distribution reduces extractable species relative to Ziegler-Natta resins, which supports organoleptic performance; sensory testing should follow the converter’s established migration and taste protocols rather than relying on a single physical property.
For food-contact applications, the fabricated article must meet the applicable regulatory framework. In the United States, the olefin polymer is subject to 21 CFR 177.1520(c) and the end-use limitations of 21 CFR 176.170(c). In the European Union, specific migration and overall migration are assessed under Regulation (EU) No 10/2011, with an overall migration limit of 10 mg/dm² for plastic materials. REACH registration and RoHS restrictions apply to the resin as a substance or article component only when relevant heavy metals or restricted additives are present; the neat polyolefin generally falls outside the scope of the RoHS directive but should be verified through supplier documentation.
| Requirement | Test / Condition | Application Limit |
|---|---|---|
| 21 CFR 177.1520(c) | Olefin polymer specification | Subject to 21 CFR 176.170(c) end-use limitations |
| EU 10/2011 | Overall migration | 10 mg/dm² |
| ASTM D1238 | Melt index | QC release, 190 °C/2.16 kg |
In high-slip food packaging, erucamide and oleamide migrate to the surface at rates governed by diffusion through the amorphous phase. The 0.926 g/cm³ density of XP 8346PA reduces amorphous fraction relative to a 0.918 g/cm³ metallocene grade, so coefficient of friction targets under ASTM D1894 may require longer post-extrusion ageing or a higher slip masterbatch concentration. Fluoropolymer processing aid efficiency can also be reduced by mineral antiblock particles that adsorb the processing aid; PPA level should be re-optimized after adding silica or talc masterbatch, and melt fracture onset should be re-evaluated at the target shear rate.
For heavy-duty sacks and agricultural silage film, the density of 0.926 g/cm³ contributes to stiffness and creep resistance. Stiffness is quantified as 1% secant modulus under ASTM D882, and creep is measured under ISO 899-1; published data for XP 8346PA in these specific applications remain limited. In structures requiring puncture resistance, the grade is often coextruded with a lower-density mLLDPE or LDPE layer to shift the average density downward while retaining the stiffness contribution of the core. Puncture resistance is measured under ASTM D5748 or ASTM F1306, and the test speed and probe diameter must be reported because puncture values are highly method-dependent. Form-fill-seal lines running 70 µm reinforced sack films should validate seal strength per ASTM F88 at both the surface layer and the buried seal interface, because coextruded tie layers and print films can alter the thermal seal response.
Bulk silo storage should follow standard polyolefin practices. Because the resin is not hygroscopic, pre-drying is unnecessary unless condensation occurs during transfer from cold storage. If condensation is present, a hopper dryer set to 60–70 °C with a dew point below -30 °C for 4–6 h removes surface moisture. Do not use hot air above 80 °C for extended hopper residence, as this can soften pellets and cause bridging. Conveying velocities in dilute-phase vacuum systems should remain between 15 m/s and 20 m/s to limit fines and streamers. The resin should be protected from UV exposure during prolonged outdoor storage because polyolefin degradation can shift melt index and color.
The operational boundaries are unambiguous: XP 8346PA is not a high-melt-strength resin for large-part blow molding or foamed structures, and it should not be processed as a neat polymer in high-stalk extrusion above a blow-up ratio of 4.0:1 without LDPE blending. It is also not a substitute for polyamide or EVOH barrier layers; oxygen barrier properties remain typical of polyethylene and must be measured under ASTM D3985 if a barrier requirement exists. Any application claim should be validated on the target converting line using the relevant test method because published data for this specific configuration is limited.
