Warning tape is installed in the ground, at a certain distance (in accordance with the applicable technical standards) above water transmission and distribution pipelines, for locating non-metallic pipes. Reference standard: DIN 54841-3. Materials: polyethylene film tape and two 0.4 mm stainless-steel wires made of AISI 304, applied sinusoidally and protected by a thin acrylic film. Color: blue. Black inscription: WATER. Dimensions: width 100 mm, thickness 0.1 mm, length 250 m. Wire elongation 20–25%. Specific weight: 0.920–0.930 g/cm3. Melting point: 120–126 C. Water solubility: NO.