Rubber, Styrofoam, air pockets, cloth, plastic
You can grind glass or plastic. For fun you can make a good lens out of ice.
The material properties are suitable for the purpose,(color, shape, corrosion resistant....) and they're cheap to make.
Fibre glass is a good material to make boats it is a mixture of glass and plastic.
A lot of plastic is made from oil. You can make it from alcohol.
Plastic, paper,
It is an insulator!!
Trapped air makes a good insulator.
Yes, it the raw material for a lot of products like plastic.
plastic and mettle wires
Cloth, leather, and plastic.
plastic bottle