I haven't read this thread in a while. Has anyone mentioned the new pyrex titanium tanks by cloud9vapors? their sweet! here's a pic
what really got me psyched about this is the size, which fits nicely on my twists.
these things are a little pricey, but work great. the one draw back (other than price I guess) is that they are a little "slidey", to quote PBusordo from his review of the Siam's. so you do need to be careful when putting them on the battery. I hold it with the drip tip when twisting it on, that way the carto doesn't slide to much.
BTW, I had asked Bert (from trippy tips) about the difference between pyrex and quartz tanks. He told me this:
"To answer your question, the difference between pyrex and quartz is basically that Pyrex (A brand name for Borosilicate) has boron added to make the glass easier to work, chemically resistant, and more forgiving to being dropped. Quartz glass is almost pure silica. Quartz tends to come in more consistent and exact sizes which I speculate to be the reason that many people use it for tanks. If you can find the right size of Borosilicate glass to fit your tank it is my opinion that you will be happier in the long run because it is more durable from the perspective of it being dropped.
The more important thing to consider than the type of glass is that the edges are polished with a flame, and not left rough. A rough edge means that there are already cracks started at a microscopic level, which can very easily lead to chips and cracks on a larger scale down the road."
I am quoting his message to me, so hope I don't get dinged for it, but he did give me permission....