Question: what are the materials used in vacuum cleaner?
Answer: Austenitic stainless steels are the most common choice for high vacuum and ultra-high vacuum systems. ... 
Mild steel can be used for moderate vacuums above 10−6 torr. ... 
Aluminium and aluminium alloys are another class of frequently used materials. ... 
Aluminium bronze is a material that looks and machines similar to brass.