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asked the Naked Scientists: Good Morning, I have a simple question. I have a product that I have made in China. It has a 2 plastic base that contains a 2" round magnet that is glued in. I recently received a shipment and ;many of the magnets are cracked, I am hearing a bunch of theories but want a scientific answer. I ordered 1,000, 2 years ago, same time of year with no magnet issues. This shipment 50% of the base magnets are cracked. Attached is one of the worst cases. ;Most are hairline. What do you think caused it? I must add there is a matching magnet disc that attaches to this base of which I have yet to find a crack. The factory said they were not cracked when the left the facility. They are saying it must have been the weather making the plastic expand/contract. I believe it is pretty mild in August in China. From there it sails to LA, and then is trucked to Florida. I am wondering if they used a substandard magnet in this production run, or could it be the glue or or or... I would love a scientific answer. To confirm or dispute.Thank you for your timeAmy GriffithWhat do you think?