ExxonMobil Exceed mLLDPE 2018MB
- Product Name: ExxonMobil Exceed mLLDPE 2018MB
- 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 mLLDPE 2018MB is typically used in formulations when melt index and density and melt temperature and die pressure must be controlled within specific ranges.
| HS Code | 168868 |
| Polymer Type | Metallocene Linear Low Density Polyethylene (mLLDPE) |
| Catalyst | Metallocene |
| Comonomer | Hexene |
| Physical Form | Pellets |
| Density | 0.918 g/cm³ |
| Melt Index 190 C 2 16 Kg | 2.0 g/10 min |
| Melting Point | 119 °C |
| Vicat Softening Point | 95 °C |
| Tensile Strength At Yield | 10.3 MPa |
| Tensile Strength At Break | 35 MPa |
| Elongation At Break | 600% |
| Flexural Modulus | 240 MPa |
| Dart Drop Impact | 200 g |
| Elmendorf Tear Strength Md | 200 g |
| Elmendorf Tear Strength Td | 300 g |
| Haze | 6% |
| Gloss 45 | 70 |
| Coefficient Of Friction | 0.2 |
As an accredited ExxonMobil Exceed mLLDPE 2018MB factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ExxonMobil Exceed mLLDPE 2018MB is supplied in standard 25 kg polyethylene bags, usually stacked on shipping pallets. |
| Container Loading (20′ FCL) | 20′ FCL loading of ExxonMobil Exceed mLLDPE 2018MB: 25 kg polyethylene resin bags stacked on pallets, secured for ocean shipment. |
| Shipping | ExxonMobil Exceed mLLDPE 2018MB is a non-hazardous polyethylene resin, not regulated for transport. Ship in sealed bags, boxes, or bulk containers. Keep dry; avoid excessive heat, sunlight, and contamination. No UN number, hazard class, or packing group required. Follow general freight and environmental handling requirements. |
| Storage | Store ExxonMobil Exceed mLLDPE 2018MB in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, ignition sources, and oxidizing materials. Keep original packaging closed and palletized to prevent moisture, dust, and contamination. Avoid prolonged UV exposure and excessive stacking. Follow first-in, first-out stock rotation and consult the SDS for additional storage requirements. |
| Shelf Life | Shelf life: 24 months from date of manufacture when stored in a cool, dry, well-ventilated area, away from sunlight and moisture. |
On three-layer cast stretch-wrap lines, the cling layer is rarely more than 8 % of total gauge
ExxonMobil Exceed mLLDPE 2018MB has a nominal density of 0.918 g/cm³ per ASTM D1505 and a melt index of 2.0 g/10 min per ASTM D1238 at 190 °C/2.16 kg. On a three-layer cast stretch line with extruder diameters of 65 mm/90 mm/65 mm and 30:1 L/D barrier screws, the resin is dosed at 60–80 wt% in the core layer. The cling layer, usually 8–12 % of total gauge, contains 1–4 wt% of a polyisobutylene masterbatch with a molecular weight distribution centered near 1,000–3,000 g/mol. The release layer typically remains at 0–30 wt% 2018MB and is blended with a C6-LLDPE to reduce skin weld. Melt temperature is held at 260–290 °C. The die gap is set between 0.5 mm and 0.8 mm, the air gap is kept below 12 cm, and the chill roll temperature is maintained at 18–24 °C. At 450–600 m/min line speed, the higher shear viscosity of the narrow-MWD metallocene resin increases extruder pressure by 10–20 % relative to a butene-based LLDPE of equivalent melt index. A Cloeren feedblock or equivalent selector-plug system is used to hold layer thickness variation below ±5 %. Finished film from 8 µm to 30 µm is evaluated for peel cling under ASTM D5458, tensile elongation under ASTM D882, and puncture resistance under ASTM D5748. Machine-grade pallet wrap operations typically pre-stretch between 200 % and 300 %; edge tear and cling transfer are monitored beyond this range.
| Layer | Function | Thickness share | 2018MB content | Key additive |
|---|---|---|---|---|
| A | Cling | 8–12 % | 0–20 wt% | 1–4 wt% PIB masterbatch |
| B | Core | 70–80 % | 60–80 wt% | processing aid 300–500 ppm |
| C | Release | 10–18 % | 0–30 wt% | C6-LLDPE blend |
What changes when a 2.0 g/10 min metallocene resin replaces C4-LLDPE on vertical FFS decks?
Vertical form-fill-seal equipment running at 60–120 cycles/min places a different demand on sealant layers than horizontal flow-wrap or lamination. A three-layer coextruded film of 40–70 µm total gauge uses 2018MB at 80–100 wt% in the sealant layer, 50–70 wt% in the core, and 0–20 wt% in the outer skin where LDPE or HDPE is added for stiffness. The outer layer contains 20–30 wt% LDPE to maintain bubble stability on a blown-film line running at a blow-up ratio of 2.5:1 to 3.0:1. The die gap is kept at 1.6–2.0 mm and the frost line height is held at 6–8 die diameters. Jaw sealing is conducted at 115–130 °C with dwell times of 0.3–0.5 s and 0.4 MPa jaw pressure. Comparative heat-seal curves generated under ASTM F1921 show that the seal initiation temperature is 10–15 °C lower than that of a conventional C4-LLDPE of equivalent density. Hot-tack strength is measured under ASTM F1921 and seal strength under ASTM F88/F88M. Slip and antiblock packages are limited to 500–1,000 ppm erucamide and 1,000–2,000 ppm silica in the food-contact layers. The film structure complies with 21 CFR 177.1520(c)3.1a and EU Regulation 10/2011 when all additives in the formulation have their own positive listing. Terminal products include frozen vegetable packs, dry snack pouches, and shredded cheese bags. The operational boundary is at 70 °C; above this temperature seal integrity in filled packages is compromised because the polyethylene matrix enters a higher creep regime.
Laminators replacing a C4-LLDPE sealant web with 2018MB typically observe that the lower seal initiation of the metallocene resin allows a 10–15 °C reduction in pouch sealing temperature without loss of bond strength. The sealant web is coextruded on a cast film line with a 0.5–0.8 mm die gap and a melt temperature of 275–300 °C. A typical construction uses 100 % 2018MB in the sealant layer and 10–20 wt% LDPE in the skin layer. The web is treated to 38–42 dyn/cm and laminated to 12 µm polyester, 18–20 µm BOPP, or 9 µm aluminum foil with a solvent-free adhesive applied at 1.2–1.5 g/m². Curing proceeds at 35–40 °C for 24–48 h. Seal strength after lamination is tested under ASTM F88/F88M at 120–140 °C jaw setpoint; values below 15 N/25 mm indicate incomplete adhesive cure or excessive slip additive migration. Migration tests follow EU Regulation 10/2011 with an overall migration limit of 10 mg/dm². For U.S. structures, 21 CFR 177.1520(c)3.1a applies to the polyethylene layer and 21 CFR 177.1395 applies to the adhesive system when polyurethane laminating adhesives are used. Terminal products include stand-up pouches for dry foods, liquid detergents below 60 °C, and non-sterile industrial pouches. The structure is not recommended for retort or hot-fill above 80 °C because polyethylene sealant deformation produces channel leaks at corner gussets.
| Jurisdiction | Standard or clause | Verification condition |
|---|---|---|
| United States | 21 CFR 177.1520(c)3.1a | Olefin polymer food-contact layer; end-use temperature below 70 °C |
| European Union | EU 10/2011 Annex I | OML 10 mg/dm²; SML for any listed additives required |
| China | GB 9685-2016 | Additives positive list; resin complies with GB 4806.6-2016 |
Frozen food film haze and seal-through-condensation thresholds
Blown film structures containing 70 wt% 2018MB, 20 wt% LDPE, and 10 wt% HDPE produce frozen food bags with sufficient stiffness for high-speed wicketing. The film gauge is kept between 50 µm and 100 µm. Die gap is set at 1.2–1.6 mm and the melt temperature is kept at 190–215 °C. The blow-up ratio is held at 2.2:1 to 2.8:1; a frost line height above 7 die diameters will increase haze above 10 % measured by ASTM D1003. Haze below 7 % is affected more by frost line cooling than by resin density. The metallocene resin does not require extra processing aid in this structure, but die-lip deposit is controlled by adding 500–700 ppm of a fluoroelastomer processing aid when output exceeds 250 kg/h on a 90 mm extruder. Seal-through-condensation performance is verified by conditioning film at 4 °C and 95 % RH for 24 h before sealing at 130 °C; seal strength remains above 20 N/25 mm under ASTM F88/F88M. Dart impact is tested under ASTM D1709 method A; a 50 µm film commonly records between 400 g and 800 g depending on frost line height and HDPE content. Terminal packages include frozen vegetable bags, IQF fruit pouches, and film used in blast freezers at -30 °C. The limitation is not low-temperature brittleness but wicketing stiffness; below 50 µm, bag opening forces on automated lines decline.
When silage wrap must retain puncture resistance at 0 °C without EVA plasticizer migration
Silage wrap is converted on monolayer or three-layer blown-film lines at 25 µm to 45 µm gauge. 2018MB is blended at 80–90 wt% with a C6-LLDPE or LDPE to improve shear response. A HALS stabilization package is added at 0.2–0.5 wt% as a low-dust masterbatch. The die gap is set at 1.8–2.2 mm; the blow-up ratio is 2.5:1 to 3.0:1; the frost line is maintained at 5–7 die diameters. Melt temperature is held at 190–220 °C. Puncture resistance is measured under ASTM D5748 at 0 °C after a 24 h conditioning period. Tear propagation in the machine direction is tested under ISO 6383-2. Outdoor life is governed by EN 13206 or ISO 4892-2 accelerated weathering; published data for 2018MB in silage films aged beyond 24 months is limited. The film is used for bale wrap, silage bags, and temporary greenhouse coverings from 150 µm to 200 µm. The absence of EVA removes acetic acid generation issues that corrode aluminum greenhouse frames. Finished rolls should not be stored under direct sunlight for more than 2 months unless the film is compounded with an additional UV absorber because the base resin itself is not a UV-resistant grade.
For industrial liners, the critical distinction is not seal initiation but resistance to tear propagation at 100–200 µm gauge. A formulation containing 70–80 wt% 2018MB, 10–20 wt% HDPE, and 10–15 wt% LDPE increases secant modulus while retaining the metallocene resin’s dart impact propagation energy. Blown film lines use a 2.0:1 to 2.5:1 blow-up ratio and a die gap of 2.0–2.5 mm. Melt temperature is kept between 190 °C and 220 °C. At these conditions, extruder backpressure is 8–15 % higher than a butene-based LLDPE reference; the screw should include a Maddock mixing section with 30:1 L/D. Tensile yield is measured under ISO 527-3, tear resistance under ISO 6383-2, and dart impact under ASTM D1709. The finished liner is used for form-fill-seal sacks of chemical granules, resin powder, and bulk food ingredients. Permeation testing under ASTM F739 is required before direct packaging of aromatic hydrocarbons or strong oxidizing acids because polyethylene swells in contact with low-polarity solvents. Pre-drying at 70 °C for 1 h is recommended only when pellets are stored in unheated warehouses at relative humidity above 60 % to avoid surface moisture pinholes. Published data for this specific industrial liner configuration is limited to converter evaluations rather than public academic studies.
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- ExxonMobil Exceed mLLDPE 2018MB 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 mLLDPE 2018MB is introduced as a single-site metallocene-catalysed linear low-density polyethylene resin intended for blown film extrusion. The grade is characterised by a nominal density of 0.918 g/cm³ when measured by ASTM D1505 and a nominal melt index of 2.0 g/10 min under ASTM D1238 at 190 °C and 2.16 kg. The base polymer is an ethylene/1-hexene copolymer. The single-site metallocene catalyst yields a narrower molecular weight distribution and a more uniform short-chain branching distribution than conventional multi-site Ziegler-Natta ethylene/1-butene copolymers of equivalent density and melt index. Because molecular architecture influences film stiffness, sealing, tear, and optics simultaneously, no single property can be used to infer the entire performance profile. Applications are primarily thin-gauge blown films in the 20 µm to 120 µm range, including produce packaging, heavy-duty sacks, label films, and sealant layers in coextruded laminates. The resin is also used in blends with LDPE for improved bubble stability on high-output extrusion lines.
| Grade | Density (g/cm³) | Melt index (g/10 min) | Comonomer | Catalyst architecture |
|---|---|---|---|---|
| Exceed mLLDPE 2018MB | 0.918 | 2.0 | 1-hexene | metallocene single-site |
| Exceed mLLDPE 1018 | 0.918 | 1.0 | 1-hexene | metallocene single-site |
| Conventional butene LLDPE film grade | 0.918 | 2.0 | 1-butene | Ziegler-Natta multi-site |
How does the 2.0 g/10 min melt index of 2018MB alter blown-film extrusion pressure profiles?
The ASTM D1238 melt index of 2.0 g/10 min is a low-shear flow indicator, not a complete viscosity curve. In blown-film extrusion, the relevant shear rates in the die lip region exceed 100 s⁻¹ and can reach 1000 s⁻¹, where the narrow molecular weight distribution of 2018MB reduces shear thinning relative to broad-MWD Ziegler-Natta butene LLDPE of equal melt index. Consequently, the pressure drop through a 1.5 mm die gap may remain similar to or slightly above that of a conventional 2.0 g/10 min butene grade despite the comparable ASTM D1238 value. Operators should not infer die pressure directly from melt index alone. A 75 mm grooved-feed extruder with 30:1 L/D running a 250 mm annular die at 100 kg/h is a useful reference configuration, but published machine-specific pressure data for 2018MB on this exact configuration is limited. Melt temperatures between 190 °C and 230 °C are standard; processing above 250 °C may initiate thermal-oxidative chain scission and gel formation. The lower viscosity of 2018MB compared with a 1.0 g/10 min metallocene grade permits lower melt temperature at equal output and reduces the risk of melt fracture on small-diameter dies. Blending with 5–15 wt% LDPE can improve bubble stability and is frequently practised on lines with high stalk heights; the exact blend ratio is governed by film stiffness, optical requirements, and seal performance.
In industrial blown-film operations, 2018MB is processed on single-flighted, moderately deep-cut screws with lengths of 24:1 to 30:1 L/D, although grooved-feed extruders with 30:1 L/D are common where high outputs are required. Screen packs use 40/60/80 mesh combinations to protect the die from agglomerated additives; die pressure should be recorded continuously because upward drift often indicates gel accumulation or degraded material at the die lip. Blown-film dies with 1.5 mm to 2.5 mm die gaps are preferred; narrower gaps increase shear stress and may induce melt fracture. Internal bubble cooling is recommended for gauge uniformity at outputs above 150 kg/h on dies above 300 mm. With internal bubble cooling, the frost line is normally maintained at 2 to 6 die diameters; higher frost lines increase dwell time and can improve dart drop but reduce machine-direction orientation and raise haze. Bubble stability is acceptable over a blow-up ratio range of 2.0:1 to 3.0:1; collapse frames with low-friction surfaces are required because film surfaces may contain slip and antiblock additives.
Film property testing for 2018MB follows standard conditioning and test methods, but the measured values are not intrinsic resin specifications. Specimens are conditioned at 23 °C and 50% relative humidity under ASTM D618 before mechanical testing. Film tensile properties are determined by ASTM D882, dart drop by ASTM D1709 with method selection based on film thickness, Elmendorf tear by ASTM D1922, and haze plus luminous transmittance by ASTM D1003. The measured dart drop impact and tear values shift strongly with film thickness, blow-up ratio, die gap, frost line height, and bubble cooling. For example, a 25 µm film produced at 2.5:1 blow-up ratio with a 1.5 mm die gap and internal bubble cooling will not yield the same absolute values as a 75 µm film run on the same line without internal bubble cooling. Published data for the complete gauge-by-frost-line property matrix of 2018MB is limited; conformance to a target film specification therefore requires process capability data generated on the specific extrusion line. Films based on 2018MB are additionally evaluated for hot tack and seal strength through ASTM F1921 and ASTM F88, while blocking force is measured by ASTM D3354 or internal methods. Gel count is assessed by camera-based systems according to internal standards; no universal ASTM method applies.
When 2018MB replaces a Ziegler-Natta butene grade in a sealant web, what differences are measured?
Direct substitution of 2018MB for a conventional Ziegler-Natta ethylene/1-butene LLDPE of equal density and melt index changes the sealant-web thermal behaviour and mechanical response. Because the metallocene architecture places short-chain branches more evenly along the polymer backbone, differential scanning calorimetry by ISO 11357-3 typically shows a narrower melting distribution and a lower onset of melting than a broad-composition butene LLDPE. The practical consequence is that heat-seal initiation may shift to a lower temperature by approximately 5–10 °C, allowing faster sealing on rotary sealers; however seal-through-contamination and hot-tack performance must be verified by ASTM F1921 and ASTM F88 on the target line because seal-bar pressure, dwell time, and coating weight affect the absolute seal strength. Optical haze is generally lower, while dart impact measured by ASTM D1709 is generally higher at equivalent film thickness. Tear propagation measured by ASTM D1922 can show a different MD/TD balance due to orientation and molecular relaxation differences; published data for this specific comparison is limited. In lamination films, the resin is used as a sealant layer where low extractables and consistent melting are required. The difference from Exceed 1018 is principally processability: the 2.0 g/10 min melt index of 2018MB gives lower melt viscosity than the 1.0 g/10 min melt index of 1018, enabling thinner gauges and higher output on lines with limited motor torque, but with a small reduction in dart impact and puncture resistance in several thickness ranges.
Processing conditions are bounded by the thermal stability of the resin and the need to maintain bubble symmetry. A typical blown-film operating window is summarised as follows:
| Parameter | Typical range | Basis/control method |
|---|---|---|
| Melt temperature | 190 °C–230 °C | Extruder barrel, adapter, and die |
| Die gap | 1.5 mm–2.5 mm | Annular blown-film die |
| Blow-up ratio | 2.0:1–3.0:1 | Bubble stability and film gauge |
| Frost line height | 2–6 die diameters | Cooling air and internal bubble cooling |
| Pellet drying | Not required if stored below 60 °C and 70% RH | Condensation control |
Regulatory compliance matrix and additive limitations
Food-contact compliance is evaluated under FDA 21 CFR 177.1520, which covers olefin polymers. Use in food-contact layers is permitted only when the finished film meets the applicable end-use conditions, total extractables limits, and additive restrictions in 21 CFR 177.1520; the resin grade itself does not guarantee compliance of a formulated film. For European Union markets, compliance is assessed under Commission Regulation (EU) No 10/2011, including the overall migration limit of 10 mg/dm² or 60 mg/kg for food simulants. Specific migration limits for any added slip, antiblock, or processing aid in the Additive configuration must be checked against the positive list in Annex I of EU 10/2011. REACH polymer exemption applies under EC 1907/2006 Article 2(9); monomers and additives remain subject to registration requirements. The resin should not be blended with halogenated flame retardants or strong oxidising agents at processing temperatures. For long-term outdoor exposure, UV stabilisation is required because the standard grade does not contain sufficient UV stabiliser for multi-year external weathering. If cold pellets are transferred from unheated storage into a warm plant environment, surface condensation can occur; pre-drying at 80 °C for 2 h in a desiccant dryer is recommended only for condensed-surface conditions, not for routine use. The resin is not a drop-in replacement for all LLDPE grades; films must be validated for blocking force, gel count, tear balance, and seal performance before commercial release.
