If you are unsure if something contains asbestos, do not disturb it, drill it, cut it or break it. Have it assessed by an asbestos assessor.
If asbestos needs to be removed before you start work, use a licensed asbestos removalist. In some circumstances the law requires it.
Be aware there is no known safe minimum level of exposure to asbestos fibres.
For more information check with SafeworkSA https://bit.ly/2xe8iz3