Most chemicals used in hydraulic fracking are not harmful, while precautions can be taken to prevent problems from those substances which are, according to a CSIRO report released today.

The 'National assessment of chemicals associated with coal seam gas extraction' overview found that more than half of the 113 chemicals used in the process would be unlikely to cause harm to public health, even if they were spilled or leaked in large volumes undetected.

Examples of those chemicals include guar gum, used in ice cream and pastry fillings, and limestone.

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