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When cold, the casting is removed by breaking the sand away to reveal the cast item. Each mould can be used only once. Furnitubes manufacture products in two types of cast iron: GREY IRON and S.G. IRON (ductile iron).
Manufacture is straightforward and it can easily be cast into intricate shapes. The graphite is present in large flat flakes within the crystal structure of the iron. These flakes behave like microscopic fault lines allowing cracks to propagate through an item when it is over-loaded. Because of this, grey iron is brittle and will not absorb a great deal of impact energy before failure. Grey iron will be the most economic choice for items that do not need to provide any structural or protective function.
Spheroidal Graphite Cast Iron differs from grey iron in that carbon is present in different percentage proportions, in the form of spherical nodules rather than flat flakes. These nodules do not encourage crack propagation. S.G. Iron is ductile; deforming before it fails making it tough; able to absorb significant impact energy. The manufacturing process for S.G. Iron is complex and the casting process more difficult than grey cast iron. Consequently S.G. items are more expensive. S.G. cast iron should be used for structural items or where impact is likely.
Unlike steel, unprotected cast iron can remain exposed to the elements for several years without undue effect on the products structural integrity. However, if the protective coatings are allowed to deteriorate, oxidation will occur and attempt to spread over the surface and will lift the paint or coating surrounding the damaged area. From a cosmetic point of view, it is therefore best to remove any oxidation with a wire brush and re-paint the damaged area to prevent the oxidation spreading. (Note: oxidation does not constitute a health and safety hazard).
If supplied as Primed finish:
If supplied as Gloss finish:
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