Originally Posted by mich
noobmom, that's very interesting, thanks for posting. I'm curious if your dh had any thoughts about the new Sigg bottles. I am going to assume that you will be staying away from them and sticking with your KK and glass.
Yes, we'll be staying with our KK bottles. I talked to DH about it last night and we came to the conclusion that stainless steel and glass are basically the best food-safe materials available to us today, although they may leach a bit. (Think lead crystal.) Ceramics are really no better because they are more porous (which means they can be prone to collecting bacteria) and are even more varied in production and materials than the other two (high-fire stoneware, porcelain, etc).
Oh, and I took a look at Sigg report on leaching. They kept the bottles heated for 2 weeks at above 100F. It showed the KK to leach iron (big surprise since that's the major component of stainless steel) and silicon. Neither is dangerous to ingest and in fact our bodies need both. The other stainless steel bottles did not really leach anything dangerous either, except one leached some aluminum. I mean come on--sodium? calcium? Instead of using the chemical symbols they could have used the common names and it would have seemed much less scary. I noticed they did not include a conclusion to the report, although it contained background, experimental, and results sections--basically everything you would have in a science report from high school--minus a conclusion. Here, I'll write it for you, Sigg, "None of the stainless steel water bottles leached dangerous heavy metals in appreciable amounts. One of the bottles leached a bit of aluminum, but even in our own FAQ, we defend minor exposure to aluminum (see question about scratched linings). Our lined aluminum bottle didn't leach either, but we didn't test for plastics, only metals."
The whole thing puts a bad taste (ha!) in my mouth. I'll use stainless steel on-the-go and glass at home. When there is no alternative, I'll use plastic and just try not to worry about it. There's only so much you can do.