Polyethylene sheets

A sheet made from at least one metallocene-catalyzed polyethylene polymer comprising from 75.0 mol % to 100.0 mol % ethylene derived units and having:

• a density of from 0.910 g/cm3 to 0.923 g/cm3,
• a melt index (I2.16) of from 0.1 g/10 min to 1.2 g/10 min,
• a melt index ratio (I21.6/I2.16) of from 28 to 35,
• a CDBI of 20% to <50%;
• an orthogonal comonomer distribution, wherein the polyethylene polymer has a molecular weight range and polymer fractions across the molecular weight range vary by more than 10 wt %, and/or at least a first peak and at least a second peak in a comonomer distribution analysis, wherein the first peak has a maximum at a log (Mw) value of 4.0 to 5.4, and the second peak has a maximum at a log (Mw) value of 5.0 to 6.0, and
• a weight average molecular weight (Mw) of from 150,000 g/mol to 400,000 g/mol;
• wherein:
• the sheet has a thickness of ≥20 mil (508 μm), has a dart drop impact strength (DIS) of ≥2,200 g, a permeance of ≤0.1 perms, and comprises a blend of the polyethylene polymer and at least one additional polymer, wherein the at least one additional polymer is a Ziegler-Natta linear low density polyethylene polymer having a density of from 0.915 g/cm3 to 0.940 g/cm3 and a melt index (I2.16) of from 0.1 g/10 min to 1.0 g/10 min.