There is much debate on the internet about the safety of SIGG water bottles. Much of the debate arises from the fact that there has been little to no research on their safety compared to stainless steel and plastic water bottles. In this article I will go over the limited information available (and why it is limited) and ultimately try to answer the question: are SIGG water bottles safe?

What we know for sure about their water bottles is that the exterior is PE Bottle made of aluminum while the interior is lined with a "water based epoxy resin." The liner is added to prevent the aluminum from leaching into the contents of one's water bottle since consuming aluminum has been proven to cause such health problems as Alzheimer's and Lou Gehrig's disease.

This liner is what makes it very difficult to answer the question, are SIGG water bottles safe? due to many unknowns about the liner. According to their website "the ingredients (like the formula for Coca-Cola) remain secret and unavailable to 3rd parties so as to ensure SIGG retains its competitive advantage. The key of course is that our liner is FDA approved and independently tested to be taste and scent inert - and resistant to any leaching (0.0%) so 100% safe."

There are three problems with these statements: 1) the last time I checked, the ingredients for Coca-Cola are right on the can; 2) the FDA has approved many plastic and canned food products that contain bisphenol A (BPA), a chemical which simulates estrogen and in animal studies has been shown to cause a wide range of health problems; and 3) the 0.0% leaching they are referring to is from an "independent" study in which they paid Alliance Technology LLC, a for profit company, to conduct.

In this study, the testers used an LOQ (limit of quantization) of 2 PPB (parts per billion) which basically means that they didn't attempt to detect BPA below this level. In the scientific world, the LOQ can be considered zero. This allowed SIGG to legally (or should I say, deceptively) claim that their bottles leach no BPA.

This liner, which was the focus of the study, at one time was described as a "water based epoxy resin" by SIGG. Those words have now been removed from their website, but it continues to be displayed on product websites such as Amazon.

According to Wikipedia "most common epoxy resins are produced from a reaction between epichlorohydrin and bisphenol A." Another interesting fact is that BPA epoxy resins were co-invented by Dr. Pierre Castan of Switzerland, the same country in which SIGG bottles are manufactured. Dr. Castan's work was then licensed by Ciba, Ltd. of Switzerland which is now one of the three major epoxy resin producers in the world.

In summary, we have learned: 1) their liner is made of a "water based epoxy resin"; 2) most epoxy resins contain BPA; 3) BPA epoxy resins were co-invented by a Swiss scientist; 4) one of the three largest manufacturers of epoxy resins is a Swiss company; 5) SIGGs are manufactured in Switzerland; 6) they have deceptively used a study where not all levels of BPA were tested to claim their bottles are BPA free and; 7) at one time they described their liner as a "water based epoxy resin," but no longer use this phrase.

At this point you may still be asking yourself, are SIGG water bottles plastic bottle supplier safe? The truth is that there isn't enough information to say for sure. Until SIGG release more information, you are going to have to use your best judgment to decide if you want to believe what they are marketing and take the risk of your water bottle leaching a dangerous chemical such as BPA. In my opinion, I would rather go with a stainless steel water bottle which has been proven to be safe and doesn't leach any chemicals.