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a torch can be made from wood and plastic
It will be made of many components the casing material will not matter much.
The Bemis Humidifier Filter is made from a number of different materials. It contains They are housed in a plastic casing but the main material of the filter is wick.
The high quality aluminum alloy material and frivolous hollow plastic parts design.
a car battery is made of a plastic casing, lead plates and a sulfuric acid/water mixture
The purpose of using a plastic casing depends on what product the casing is for. Generally plastic is used because it is a very versatile material that can both protect and look good. Plastic is also easy to color and a relatively cheap material.
A cutting torch can be used on any material though it was made mainly for cutting metals. The heat generated may damage other materials such as wood or plastic.
Natural casing which is most common is made from pig intestines which has been flushed throughly. They also have synthetic casing though.
Metal casing on kettles is common. Metal casing is desired on anything to put on the stove. This is because the material conducts heat so well and efficiently stays warm.
Usually polyethylene (casing) and polyurethane foam (insulation).
the original olyimpic torch was made from wiker and reeds