Coal analysis

Typical particle distribution % retained

Coal dust is used mainly as an additve to greensand systems to create a reducing atmosphere in the mould and prevent metal penetrating into the sand leaving a smooth, clean iron casting surface. Depending on the metal type and the size of the casting normally determines the grading of coal to be used. Coarse grades are used in high pressure vertical moulding systems such as Disa units and medium and finer grades are used in horizontal plants but this varies depending on other factors such as performance, Bentonite type and sand quality.

We specialise in two main coals which have been selected for their all round properties and in particular in their low ash content and high volatile evolution. High total carbon and low sulphur complete the product suitability and both are excellent in performance.

One coal has a high swell index and many foundrymen value this property whilst other prefer the slightly higher volatile coal with no swell.

Graded coal, low ash, high volatile (Swelling)

Typical particle distribution % retained

Pulverbond: Graded coal/Bentonite

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Anthracite

Typical particle distribution % retained