A CT scan of Stanley’s Quencher cup has confirmed that the lead is located only at the bottom of the cup, covered by a stainless steel cover, making it inaccessible to customers. The lead is used as a solder to seal the vacuum insulation layer in the cup. The company, Stanley, assures that unless the medallion covering the lead solder is pried off, users won’t be exposed to lead at all. However, if the medallion becomes unsealed or falls off, lead exposure might occur. The safety of Stanley cups, therefore, might come down to a matter of luck.
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