Complex sentence: A cured thermosetting resin is called a thermoset or a thermosetting plastic/polymer-when used as the bulk material in a polymer composite, they are referred to as the thermoset polymer matrix.
Split into simpler sentences: A cured thermosetting resin is called a thermoset or a thermosetting plastic/polymer. When used as the bulk material in a polymer composite, they are referred to as the thermoset polymer matrix.