Packaging film

A wrapper made of an unstretched at least single-layer polyolefin film which optionally has release properties, comprising

• a) a layer (a) with thickness from 6 to ≤20 μm,
• based on a mixture of α) from 20 to 49% by weight of a polypropylene or of at least one propylene copolymer, or of a combination thereof, and
• of β) from 80 to 51% by weight of at least one polyethylene or ethylene copolymer, or of a combination thereof, and
• optionally of γ) conventional auxiliaries,
• wherein the α) component has a VICAT temperature of at least 130° C., as measured by ASTM D 1525-00, Rate A (50° C./min), Loading 1 (10 N), and
• b) optionally on at least one surface of the layer (a) a release coating (b) made of cured polysiloxane
• and
• c) optionally on at least one uncovered surface of the layer (a) an optionally sealable layer (c) with thickness from 4 to 10 μm made of a thermoplastic polymer with melting point lower by at least 5° C. than the melting point of the layer (a),
• wherein the tensile strength of the polyolefin film in machine direction is at least 6.5 N/cm, measured in accordance with DIN EN ISO 527-3.