Because there is a resistance to chemicals, heat and humidity are fixed-size, shape and surface well usually do various kinds of bottle container in the laboratory. Containers, packaging, batteries, engine, propeller, etc.
Due to its resistance to chemicals, moisture, heat and cold, hard and maintains a good shape. Typically used in the bottle. Container in the laboratory Propeller engine battery container and so on.
Because the chemical resistance, moisture and heat the solid surface and the size, shape, typically used to make various kinds of bottle container in the laboratory. Packaging containers, battery, rotor engine, etc.!