Beta L

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No physical example seen as yet but its existence is confirmed via a Millstone Grit pamphlet.

A Millstone Grit and Fireclay pamphlet ltd, Herbertshire Works, Denny states

Alpha – 40 – 42% Alumina. Silica 53.2 %. High Duty Fire Brick.

Beta   – 38 – 40% Alumina. Silica 55.5 %. Medium Duty Fire Brick

Beta L – For use in Ladles, Tundishes etc

Alpha + –  42.1% Alumina. Silica 51.3 %. Super Duty Fire Brick

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