Wanted TO-247 Beryllium Oxide pads - Page 2 - diyAudio
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Old 1st July 2002, 06:22 PM   #11
panos29 is offline panos29  Greece
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Unhappy Asbestos!

Well, I could not help myshelf arguing on asbestos!
Did u all know that less than 10 years ago all of us were poluting our beloved earth using brake pads containing lots of asbestos?
Not to our knowledge though, but the ones who did the decision making, decided that asbestos is no good for brake pads just 10 years ago...

I use berrylium dioxide insulators in my aleph30 and these are the best ever tried(salvaged from an old UPS), but u can order also aluminium oxide insulators with comparable performance and more user friendly.
Moreover, BeO2 insulators are safe enough, provided u use plastic gloves and that u do not swallow or breaking them, as toxic is only their dust. For the ones who cannot access such materials mica are very, very good, too.

Sincerely,

Panos
 
Old 1st July 2002, 07:14 PM   #12
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Well, I cannot help myself arguing about it too, when I hear cries of danger from others who did not experience it but only heard about it.
I handle all my BO pads without gloves. Once I even tried to trim one on a belt sander but it was too hard so I stopped (of course it was before I read all about its danger on a Forum). Basicly, its ceramic like and there is no dust coming from it.
Neverthereless, I have never experienced any harmful effects and I will continue to use it.
 
Old 1st July 2002, 07:52 PM   #13
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Peter.

So where I can find BO TO-247.

Thanks in advance.

Trigon.
 
Old 1st July 2002, 07:54 PM   #14
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Active Components (beside Supersonic in Scarborough) sell them. Matheson & Dixie location stock them too.
 
Old 1st July 2002, 07:59 PM   #15
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THANKS.
 
Old 1st July 2002, 08:19 PM   #16
grataku is offline grataku  United States
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Panos and Hpotter in no particular order...
it's BeO or beryllia, not BeO2. You can make BeO2 or Be2O or other gasous variations by laser ablation of the BeO ceramic but I don't suggest you breath the vapor byproducts. Under normal conditions it's hard for a group II element to have a +4 or +1 oxidation state.
Anyways, asbestos made GREAT brake pads far superior to whatever they are using today, however, it is also true that for auto mechanics that have worked in the asbestos era the incidence of lung cancer is much higher than in the normal population, though it's also true that mechanics smoke like mother****ers.
Dust maybe hard to see with the naked eye and cancer is one of those pesky things you may not experience for years to come. Do you really want to take the chance?
What is the fixation with beryllia? Did you actually measure the difference in transistor temperature and heatsink temperature with a beryllia insulator and compared it to a mica insulator with silicon-zinc grease? Do the trannies run cooler with the beryllia pad? How much cooler?
 
Old 1st July 2002, 08:48 PM   #17
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Grataku,
You might have a point here. Just reading about it makes me sick already.
 

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