383 & 384: Both provide better die filling, but with a moderate sacrifice in mechanical properties, such as toughness. Process: Sand Casting, Gravity Casting, Low-pressure Die Casting, High-pressure Die Casting, Permanent Casting. Custom Made for All Industries. COMPOSITION E380.0 383.0 B383.0 384.0 Silicon 7.5-9.5 9.5-11.5 9.5-11.5 10.5-12.0 Iron 1.3 1.3 1.3 1.3 Copper 3.0-4.0 2.0-3.0 2.0-3.0 3.0-4.5 Manganese 0.50 0.50 0.50 0.50 Magnesium 0.30 0.10 0.30 0.10 Nickel 0.50 0.30 0.30 0.50 Zinc 3.0 3.0 3.0 3.0 Tin 0.35 0.15 0.15 0.35 Total others 0.50 0.50 0.50 0.50 Aluminum Bal. Bal. Bal. Bal.