Glass fabric laminates are a group of thermoset plastics that combine glass fabric with different resins. Some of the grades available in this class include, but are not limited to: G-7, G-9, G-10, FR-4, and FR-5. Each grade provides different mechanical & electrical properties to suit different applications. FR-4 combines woven glass fabric with epoxy resin and is used for circuit boards and other electrical parts. It has excellent electrical, mechanical, and flame retardant properties as FR-4 contains bromine to make it fire-retardant. NEMA Grade G9 combines glass fabric with melamine resin to produce a very hard, flame-resistant material. It also has excellent electrical properties. G-7 is a glass-silicon laminate with excellent insulating properties.