Plastics, paints, rubber, foams, adhesives, sealants, varnishes and many more.
About 7-8 years More. The real answer would be 7.14285714286
most metals conduct electricity and are very dull to the look. most metals are toxic if eaten and are hard.
aluminum is a type of metal they is softer than the opther and conducts eletricty like a boss.
nickel on the opther hand is also a metal but does not conduct a lot of electricy.
metals can be bent and others can break,