Concordo que se trata de uma placa cimentícia, mas, salvo melhor opinião, julgo que não se deve traduzir e escrever em maiúsculas já que corresponde a uma marca... Ver:
An expanded shale known as 'Haydite' was patented
in 1919, and used in block making in 1923. A blast furnace slag known as 'Pollsco' (later 'Celocrete') was introduced in about 1930, and later in the 1930s a slag expanded with steam was introduced under the name of 'Waylite'.
http://mileslewis.net/australian-building/pdf/cement-concret...