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--- projects:glass_sphere:housing [2019/01/05 02:19] – tjhowse
+++ projects:glass_sphere:housing [2019/01/05 06:05] – tjhowse
@@ Line 1: / Line 1: @@
 ====== Material selection ======
+== Glass ==
 Glass is pretty good. When tempered and treated it's pretty shock-resistant, can handle a wide range of temperatures, handles radiation.
+= Toughening =
+Tempering glass makes it strong. I've done this already on the leaf-in-glass project. Also soaking in molten potassium nitrate at 300 degrees for a while. This [[https://patents.google.com/patent/US3445208|patent]] describes a process which uses all kinds of nasties dissolved in the liquid KNO3. I'm not going to risk fluoride poisoning.
 ====== Shielding ======
-Leaded potting compound, or lead sheets wrapped around the electronics.
+Some of the cooler options for electronics inside the sphere require microcontrollers and flash storage, which would have their effective lives extended with some radiation shielding. I'll use a leaded potting compound (if it exists), or lead sheets wrapped around the electronics.