SYDNEY, Nov 18, 2025 (BSS/AFP) - Asbestos contamination in tubs of children's play sand imported from China on Tuesday forced a string of school closures in New Zealand, the country's education department said.

Hundreds of schools across Australia and New Zealand have in recent days been scrambling to check whether they were using the tainted products.

Forty schools and daycare centres had been closed in New Zealand as they tracked down and removed the decorative sand, a Ministry of Education spokesman said.

More than 70 schools were shuttered in Australia on Monday.

New Zealand's workplace safety regulator said batches of the play sand were contaminated with chrysotile asbestos.

"This sand product is allegedly imported from China and can be used in classroom activities, as well as other decorative and craft uses at home," WorkSafe New Zealand said.

Asbestos is a naturally occurring mineral fibre that was once widely used for construction because of its heat-resistant properties.

But studies have found a clear link between lung cancer and long-term exposure to chrysotile asbestos fibres.

Australia's product safety watchdog said the risk was low as tests had so far not detected breathable fibres.

"The release of respirable asbestos fibres is unlikely to occur in its current state, unless the sand is processed by mechanical means such as crushing or pulverising," it said.

"The risk that any asbestos found is likely to be airborne or fine enough for inhalation is low."