Use of material properties in commercial products

There are many commercial products that are made from metal. These products are used daily either at home or in a Design and Technology workshop.

Cooking utensils such as knives and pans are mostly made of metal. Stainless steel is the likely choice of metal for making both pans and knives. Between 10.5 per cent and 27 per cent of chromium is added to iron to produce the alloy stainless steel. The chromium produces an oxide layer on the outer surface of the steel and prevents corrosion.

Pans made from stainless steel usually have a polished finish and can be classed as non-stick if they have a special coating on the inside. Polytetrafluoroethylene (PTFE), is the coating that is most common, but other coatings such as ceramic and enamel are also popular.

Some hands moving two fried eggs with a spatula from a black non-stick pan to a plate.

Some pans are made from copper as it conducts heat very well, but these are expensive because of the cost of copper as a raw material. Aluminium can also be used for making pans as it heats up evenly, avoiding ‘hot spots’ on the base, with polytetrafluoroethylene (PTFE) being a common non-stick coating.