Depends what type of plastic, and how thick.
generally clean plastic is a good insulator, but it depends on the type plastic, the thickness (spacing) and the voltage you are trying to insulate against. For example a 1/4" thick piece of plastic will insulate about 1000 volts, but would not stop a lightning bolt from going right through it
Foam will insulate better than plastic.
It doesn't insulate well.
There are many types of insulation that can be used to insulate a house. There is fiberglass, mineral, plastic fibers, and natural fibers insulation.There is also insulation boards.
because it is not made of plastic or metal.
Wrap it in newspaper and put it in a plastic bag.
To insulate the wires
Aluminium foil or plastic wrap insulate the heat of the wrapped up material.
To insulate windows with plastic for winter, the best ways include using a window insulation kit, applying double-sided tape around the window frame, attaching the plastic film to the tape, and using a hairdryer to shrink the film for a tight seal.
plastic or rubber
Plastic is an insulator. It does not easily conduct electricity because its molecular structure does not allow for the flow of electrons. This property is why plastic is used to cover and insulate electrical wires.
Seal soft plastic to the interior of the window., I have insulated using thermocool an effective insulator.