Clay Graphite Pattern numbers Stand A 1 XO.1 A 2 XO.3 A 3 XO.3 A 4 XO.5 A 5 XO.6 A 6 XO.6 A 8 XO.8 A 12 XO.14 A 16 A 20 Silicon Carbide Pattern numbers Stand AX 8 XO.8 AX 12 XO.14 AX 16 AX 20 Recommended for melting aluminium