Process for producing pipe by biaxial elongation

A process for producing a biaxially oriented pipe by

• a) forming a polyethylene composition into a tube, wherein the polyethylene composition comprises high density polyethylene (HDPE) and a second polyethylene comprising a linear low density polyethylene (LLDPE), wherein the LLDPE has a density of 932 to 948 kg/m3 and
• b) stretching the tube of step a) in the axial direction and peripheral direction to obtain the biaxially oriented pipe, wherein step b) is performed at an axial draw ratio of at most 5 and an average hoop draw ratio of 1.1 to 2.0;
• and
• wherein the obtained biaxially oriented pipe has an outer diameter and a thickness and wherein the outer diameter is 2 mm to 1 cm and the thickness is 0.3 mm to 2 mm, the outer diameter is 1 cm to 10 cm and the thickness is 1 mm to 3 mm, or the outer diameter is 10 cm to 50 cm and the thickness is 1 mm to 1 cm, or the outer diameter is 50 cm to 2 m and the thickness is 5 mm to 10 cm.