The text suggests that Celotex Ltd. was the first to manufacture free rise PIR laminate foams. While this may be true in the UK, to be fair the chemistry, technology, and manufacturing were first done in the USA by Celotex Corp. and the staff at Jim Walter Research Corp. Celotex later built the plant in the UK after at least two plants were operating successfully in the US.
Keep on reading: Letter: Celotex UK was not the first to make PIR boards.
Keep on reading: Letter: Celotex UK was not the first to make PIR boards.