Fluororesin film and its use

A fluororesin film comprising:

• an ethylene/tetrafluoroethylene copolymer as the main component, and
• titanium oxide composite particles,
• wherein:
• each titanium oxide composite particle comprises (i) a silica-covered titanium oxide particle and (ii) a hydrophobizing agent covering the silica-covered titanium oxide particle;
• the surface of the fluororesin film in contact with air has an arithmetic mean roughness Ra, as stipulated by JIS B0601, of from 0.5 to 3 μm;
• the silica-covered titanium oxide particles comprise from 1.5 to 5 parts by mass of silica, calculated as SiO2, per 100 parts by mass of the titanium oxide particles;
• the silica-covered titanium oxide particles have a difference (Δ300-100) in the Karl Fischer water content between 300° C. and 100° C. of at most 0.5%;
• the titanium oxide composite particles comprise from 0.5 to 10 parts by mass of the hydrophobizing agent per 100 parts by mass of the silica-covered titanium oxide particles;
• the fluororesin film has a thickness of from 12 to 100 μm;
• the fluororesin film has an initial breaking strength of 52 to 65 MPa;
• and
• the fluororesin film has an initial breaking extension of 290 to 350%.