Question from Sarah Padron
Hi Debra,
Hello, I was wondering if you know about the prefiniahed hardwood floors that have been treated with aluminum oxide. Can children, and adults, absorb the tixins through the skin? And would it be problematic?
Thanks.
Debra’s Answer
Here’s a relevant response from consultant Mary Cordaro, who is very knowledgeable in these matters.
It’s from Green Home Guides.
Aluminum oxide finishes can be fast-curing and healthy from a chemical outgassing standpoint, depending on a few variables. Unlike some water-based polyurethane finishes, which often contain chemicals called glycols that may “outgas” for several months (and may not be easily detected by odors), UV-cured aluminum oxide finishes, which are modified urethane finishes, are often well-tolerated even by chemically sensitive individuals. This is particularly true if the finish is baked-on and UV-cured, which is usually the case with prefinished wood floors.
But here’s where things get more complicated, unfortunately. Besides low chemical toxicity, there are some additional factors to consider regarding an aluminum oxide finish. First, from a healthy house standpoint, very little if anything is known about possible health effects from the aluminum content in aluminum oxide floor finishes.
In the past few years, there has been a growing, heightened awareness of the potential toxicity from nano-sized heavy metals in products that touch the skin. Although this concern has been directed primarily at personal products, it is worth considering for any product that touches the skin. One MD I know of, whose patients include chemically sensitive people, has been strongly advising against aluminum oxide finishes, due to the possibility of aluminum oxide absorption through the skin on bare feet.
Prompted by these concerns, a client with an autistic child requested that I look into one particular flooring product, called Bellawood, a brand that is well tolerated by many chemically sensitive people. Bellawood is a solid hardwood flooring product, prefinished with UV-cured, baked-on aluminum oxide urethane. Bellawood is coated multiple times and comes with a 50-year warranty on the finish. I spoke with a technical expert who works for the industrial finish manufacturer that makes the Bellawood finish. He reported to me that the aluminum oxide particles in the finish are much larger than nano-sized. In fact, we both agreed that theoretically, the aluminum oxide particles are probably much too large to penetrate bare skin.
I have not researched other aluminum oxide finishes in terms of the particle size, but it’s possible, given the similar characteristics of aluminum oxide finishes in general, that this may be true for other brands as well. However, as far as I know, there really is no real conclusive data on this issue, regarding possible toxicity from skin contact. So even if you have an aluminum oxide finish, if you want to be on the extra safe side, just wear socks and slippers indoors.
