Brass is a low friction material so it does not create sparks. This is why it is often used to make the fittings, the components inside a gauge, and connections. Brass is a malleable material, which means it can be easily shaped, and it is resistant to corrosion.
Stainless steel
Stainless steel is made up of iron, nickel and chromium. It resists staining and corrosion, and is used for its strength.
The outer case of a pressure gauge often made of stainless steel, but can also be made of brass, aluminium, pressed steel or plastic.
Polycarbonates
Polycarbonates are a type of plastic polymer that can be easily worked, moulded and thermoformed.
Polycarbonates are impact resistant, scratch resistant, highly transparent and a durable material. All these properties make it a suitable material to use to make the clear face on the front of the gauge.
Rubber
Rubber is an elastic substance originally made from the latex of some plants and trees.
The boot that covers the case of the gauge for added protection is made out of rubber. This is because rubber is waterproof, resilient, resistant to tearing, oils, solvents, and other chemicals.
Aluminium
Aluminium is an element with a silvery, white appearance. It is a soft, relatively durable, lightweight and malleable metal.
Both the dial face and often the needle are made from aluminium. The needle needs to be lightweight so it can move easily and indicate the measurement of pressure quickly and accurately.
PVC
PVC (polyvinyl chloride) is a very commonly used plastic. PVC is abrasion resistant, lightweight and tough.
The needle in the testing gauge is sometimes made out of PVC. PVC is used for the needle as it is lightweight and prevents it from scratching the surface of the dial.
