Which of the following is NOT a type of composite material?

Composite materials are defined as materials made from two or more constituent materials with significantly different physical or chemical properties. These components work together to produce a material that has unique properties suitable for specific applications.

Glass wool, while it may seem like it has composite-like features due to its structure, is primarily a fibrous insulation material made from glass fibers. It does not fit the traditional definition of a composite material because it does not consist of two distinct phases that enhance the properties of the resultant material.

Reinforced steel, carbon fibre, and chipboard, on the other hand, are all composite materials. Reinforced steel combines steel with materials like concrete to enhance strength. Carbon fibre consists of numerous strands of carbon that provide high strength-to-weight ratios. Chipboard is made from wood chips and adhesives, forming a composite that is widely used in furniture and construction. Thus, glass wool stands out as not being a composite material in the same sense as the other options.