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In Reply to: RE: So... Styrofoam bad, Felt good! posted by Posy Rorer on June 30, 2007 at 13:50:27
To be honest, I don't know what I am, perhaps interested but not sincere... Clearly I'm interested enough to read posts about it and thus appreciate your input which has raised some questions, to wit:
More than four adversity ratings would be helpful, I suppose Zbeads and magnets have a high perm in common and batteries and bleach are both high conductivity liquids. Not a large enough sample to conclude much.
"Place a small piece of PVC on a compact disk (outside of a cd player), and then compare with a small piece of polycarbonate". Wouldn't the relatively large polycarbonate mass of the CD dominate the influence of the chip of material placed upon it and throw off the test. Why not just put the stuff directly on the player?
Thanks for suggesting their site, I'll look for a list of beneficial stuff.
Now, the most interesting question: Why not the car? If the car is special, how far does it need to be driven to be OK?
Finally, you say: "Odd good, even bad. Except in cases where it's odd bad, even good." So, does that mean it's not a reliable principle?
Rick
Follow Ups:
is shatterproof, hence its use in 'bulletproof' glass. I have dropped a few CD's and have had them crack: a clear indication that manufacturers are using far cheaper materials in CD manufacture. Among other properties, (high electrical resistance, part of the reason that plastic caps for binding posts were originally made using polycarbonate) polycarbonate when pressure is applied normally does not turn white as normal plastics do. The 'soft' nature of polycarbonate simply 'gives and leaves a relatively smooth, clear impression making it easier for the laser to track through small imperfections.
Styrofoam has high amounts of static, check out those 'peanuts' your shippers use. Foam, which I wrote, can be fabricated from many different materials with various properties.
In general, natural substances work better acoustically than synthetics, Maybe its because they are generally neutral electrically, but also because they have a certain amount of 'randomness'. Synthetic fibers tend to be mono filaments of identical diameters: natural silk and cotton, for example, will have slight but important unit to unit variations.
Stu
Hi Stu,
Well... I really don't know if CD's are pure PC or some sort of blend. As you point out PC has desirable optical characteristics similar to glass. It certainly acts similar when you exceed it's elastic limit. I had a defective CD that I decided to break in two so it could never plague me again. Well it had the last laugh, it was tough to get it to break and after I did I spent half an hour picking out slivers of it from the carpet. I suspect that the shatterproofness of bullet proof glass is largely a function of it's thickness.
I bet you've put your finger on it regarding "natural" substances being better acoustically due to randomness. That really makes sense to me. Especially since I believe that the primary coupling mechanisms are likely to be acoustical or electrical rather than a mystical energy field.
I find it amazing that audiophiles of all people would discard the most likely mechanisms if favor of mystical ones just on the basis of measurement difficulty. If there's anything that distinguishes us from 'normal' folks it's that we aren't very surprised to discover stuff that matters to our enjoyment that may seem unlikely at first blush. Often because the threshold level of the effect is far lower than one would suppose.
Regards, Rick
I have strips of polycarbonate which I used to use as fairing strips or as french curves when I worked as a shipfitter loftsman. A 1 inch wide strip of polycarbonate, 1/8 inch thick and three feet long was flexible enough to tie knots in it. At the shipyard, we used to put the polycarbonate in a sheet metal bender and bend pieces into right angles or even greater with no shattering at all (making custom covers for equipment and such). In order to make a 90 degree bend, we had to bend it way over, by about 45 degrees or so.
I believe many current CD's are regular plastic with possibly a very thin sheet of poly on the label side, although I definitely have had one CD where the only coating on the label side was the paint. That would explain why your disc was hard to break. But I do use polycarbonates like Lexan and Tuffax, for making adapters for chassis to convert from terminal strips to 5 way binding posts a lot. Never had a cracking problem working them drilling as well as bending. I guess you would be right, there has to be a limit to which it can take a bend, but I never approached it.
Stu
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