terryrandal

One measure of green is how much energy does it take to make it compared to other products. If it is already a by product of another process is is now saving energy that would be used otherwise. If it takes more additional energy to make it into its final use then that must be accounted for. It is not green because it is recycled in my view.

Then we must get down to other characteristics. Cost to install, efficiency, other desirable features like sound proofing, water absorption, ease of retrofit etc. Greenness is too simple minded a term, and definitely not easy to compare. The rating system is deficient if it only compares recycleability!

I haven't read the article so I don't know where the 97 % efficientcy comes from and how it was measured. As an engineer I suspect that number until I read how it was arrived at. Titanium is a lighter alloy but my guess a 22 oz hammer weighs 22 oz. It is the momentum of the head that is providing the energy to drive the nail. So what does the titanium alloy do in this equation. The head can be larger for the same weight of hammer. The name is sexy but is the weight distribution different to give it more effect. It must feel different to the user, I would have to feel it to know why. Till then the test is suspect to me and the claims inflated. It sounds like the law of conservation of energy is not in effect. Put me in the interested but doubtful column!!!!!!