In our post on Bisphenol A from Nalgene water bottles and other polycarbonate bottles, a number of commenters asked about the lining in SIGG aluminum bottles, expressing concern that their linings might leach BPA. So we asked them, and received a response from the CEO, Steve Wasik. He says that SIGG uses a proprietary liner formula from a Swiss supplier with "an impeccable reputation for quality" but that "as there are many copy-cat manufacturers in the market (most based in China) that would like to get their hands on this formula, our supplier has an agreement with SIGG to keep his formula confidential."
Wasik continues: "Very thorough migration testing in laboratories around the world is conducted regularly and has consistently shown SIGG aluminum bottles to have no presence of lead, phthalates, Perfluorooctanoic Acid (PFOA), Bysphenol A (BPA), Bysphenol B (BPB) or any other chemicals which scientists have deemed as potentially harmful.
SIGG also hired an independent lab test their bottles against the competition:
"Under harsh conditions to simulate time and use, the results were as follows:
• Polycarbonate #7 plastic bottles – 71 ppb (parts per billion) were leached into the water.
• Chinese-made aluminum water bottles – 19 ppb
• New SIGG bottles – no detectable BPA
• Used SIGG bottles (2 years old) – no detectable BPA"
Does this mean they are not made with BPA? Not necessarily, it could just mean that they make them well and polymerize all of the BPA, in which case there would be no leaching, and that the layer is really thin compared to an entire plastic bottle so that there isn't much there to start with. We certainly prefer an open and transparent answer and Wasik gets this:
"Despite the scientific evidence that SIGG bottles are 100% safe, I understand the desire of some people to know more about the proprietary SIGG liner. As our Swiss supplier insists on protecting his formula & keeping it confidential, I have commenced the process of exploring new suppliers."
Conclusion: We are not sure if the lining of SIGG bottles is made with BPA or not, but we like the results of the testing, which is what really matters. Just be certain to buy the real thing and not a knock-off. Download a PDF of the full SIGG response here.
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