In what applications can clean steam be utilized?

Clean steam is typically utilized in applications where a high level of purity is essential, particularly in the food, pharmaceutical, and medical industries. Vacuum forming systems, which involve heating certain materials to a pliable state and then forming them into desired shapes, often require clean steam for temperature control without introducing contaminants. The use of clean steam ensures that the final products are free from any harmful residues or chemicals that might leach into food or medical products during the manufacturing process.

In contrast, the other options involve applications that do not prioritize the same level of purity. Hydraulic systems generally use oil or other fluids and do not require steam. Heating residential buildings may use steam, but it is typically not classified as "clean" steam in the context of purity standards. Water filtration systems also use other forms of water treatment technologies rather than clean steam as a means of purification. Hence, the application of clean steam is specifically relevant to processes like vacuum forming where contamination must be minimized.