Question

what material serves as the matrix (binder) in fibreglass? resin thermoplastic fibres of glass cement

Explanation:

Fibreglass is a composite material. In composites, the matrix (binder) holds the reinforcing material together. Resin is commonly used as the matrix in fibreglass. Thermoplastic is a type of polymer but not the typical binder in fibreglass. Fibres of glass are the reinforcing material, not the binder. Cement is used in other composite - like concrete, not in fibreglass.

Answer:

Resin