Plastics are resistant to weather, solvents and many other chemicals. Depending on the composition of the plastic, it will resist acids, lye, solvents and oil. There are plastic types with good resistance to virtually all chemicals.
This resistancy makes certain types of plastic ideal for:
Food packaging
Bottles
Containers for chemicals
Engine parts
Cleaning equipment
Think of the difference between using a metal bucket when cleaning, and a plastic one.
