PP bottles / polypropylene / - The polypropylene material is marked with the sign "PP" on the bottle. For boiling and sterilization / temperature above 80 degrees C / the bottle should always be disassembled and left open, as otherwise it may to reach deformations. Certain substances in the beverages (eg carrot juice) may color the bottle or affect the smell (eg fennel tea). This does not impair the suitability of the bottle or its safety.