Asbestos insulating board, also known as "AIB" or by the trade name "Asbestolux", was an asbestos containing board used in the building trade because of its excellent fire resistance and heat insulating properties. These boards were commonly used in the UK from the 1930s up until production was terminated in 1980. AIB tended to contain 25-40 sbestos, with amosite being the most common form of asbestos used, although a mixture of amosite and chrysotile was also common, and crocidolite was sometimes used in older boards and some marine boards.