Dyson Group plc is engaged in the research, development, manufacture and sale of chemically based performance materials, advanced materials and thermal application products used in a range of industries. It operates in three segments. The Performance Materials segment includes the saffil high-alumina fiber business based in the United Kingdom, South Africa, United States and Japan; millennium materials specialty ceramics business based in the United States, and specialty ceramics businesses based in the United Kingdom. The Thermal Technologies segment contains kiln furniture business based in the United Kingdom; precision ceramics supplying the steel and glass sectors based in the United Kingdom and Indonesia; holloware business based in the United Kingdom supplying the steel sector, and refractory brick business based in the United Kingdom. Distribution segment includes the builders merchant business based in the United Kingdom.