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Alum. perforation ceiling tile - with 0.5mm dia. & 1.8mm dia.
One shown 1.8mm dia. perforation (standard), one shown the 0.5mm dia. perforated hole (up-to-date and only available for the alum. materila). Tile powder coating passed ASTM E84 class A, BS476 part 6 and 7.
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