Polymer formulations and irrigation tubing including polymer formulations

A polyethylene formulation comprising:

• from 45 weight percent (wt %) to 90 wt. % of a medium density polyethylene (MDPE) having a density of from 0.930 grams per cubic centimeter (g/cc) to 0.950 g/cc and a melt index (I2) from 0.05 grams per ten minutes (g/10 min) to 0.5 g/10 min;
• from 10 wt % to 50 wt % of a polyethylene composition having a density from 0.910 g/cc to 0.936 g/cc and a melt index (I2) from 0.25 g/10 min to 2.0 g/10 min;
• and
• from 0.5 wt % to 5 wt % of a masterbatch composition;
• wherein the polyethylene composition comprises:
• a first polyethylene fraction area in a temperature range of 45° C. to 87° C. of an elution profile via improved comonomer composition distribution (iCCD) analysis method, wherein the first polyethylene fraction area comprises at least 50% of a total area of the elution profile;
• a second polyethylene fraction area in a temperature range of 95° C. to 120° C. of an elution profile via improved comonomer composition distribution (iCCD) analysis method, wherein the second polyethylene fraction area comprises less than or equal to 23% of the total area of the elution profile;
• and
• wherein a ratio of the first polyethylene fraction area to the second polyethylene fraction area is 2.9 to 12.5.