Material: Ductile Iron. Standard: ASTM A536-84, Grade 65-45-12. Weight: 0.1kg-8kg. Type: 1/2"-6". Process: DSIA makes mould,Electric arc furnace makes with molten iron, Heat treatment Application: sealing up interface of pipelines. Export: America, England, Australia. Casting Dimension Tolerance: ±0.2-0.39mm. Surface: Refinement. Competitive Advantage: High Precision on measurement and meticulous surface.