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Called Asbestolux, the substance is also known as low-density board, and is generally made up of about 70 per cent asbestos.
Of the 289 schools inspected by the Education Department in 2009, the substance was detected in 115.
Liberal National Party education spokesman Dr Bruce Flegg today accused the Queensland Government of trying to cover up the latest threat.
“It is an extremely dangerous product and it was subject to a Government report in 2007, and no action was taken until 2009,” he said.
Questioned by Dr Flegg at a parliamentary estimates hearing last week, Education Department director general Julie Grantham confirmed the substance had been found in 6.9 per cent of school walls tested.
But Dr Flegg says 1400 schools in Queensland remain to be checked.
“This substance should have warning signs placed on it wherever it is found,” he said.
“This can be broken down to fibres by thumb nail and also releases far more asbestos fibres than any other asbestos product.”
According to Workplace Health and Safety Queensland, low-density asbestos fibre board was typically used for wall and ceiling panels in high-humidity areas in the 1950s and 1960s.
“Low-density asbestos fibre board is softer than asbestos cement sheeting and will crumble easily if disturbed,” says a Government information sheet on the substance.