Border authorities have made more than a dozen interceptions of asbestos since a department shakeup last year, amid fears lax enforcement is allowing the killer substance to flood into the country from overseas.

Australian Border Force has made 13 seizures of the banned building material since its establishment in July last year, according to figures obtained by Fairfax Media.

The Australian Border Force has made more than a dozen seizures of banned building material asbestos. Credit:AAP

The disclosure comes after asbestos was discovered in Chinese-sourced materials at a string of construction sites this year, casting doubt on the enforcement of an import ban introduced in 2003.

Since July, the deadly fibre has been found at Perth Children's Hospital, a smelter redevelopment project in Port Pirie, South Australia and the Queensland state government's new Executive Building in Brisbane. Sixty-nine sites around the country connected to the supplier, Chinese builder Yuanda, are now being examined for contamination. Among the 11 sites being looked at in Victoria are the ANZ Centre and the Vogue building in Melbourne.