Specific Process Knowledge/Etch/KOH Etch/ProcessInfo: Difference between revisions

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 ==Mixing KOH==
-Danchips standard solution in the KOH baths has a concentration of 28 wt% and is mixed of either 500 g KOH pills to 1 l of water or 1liter of a premade 50wt% KOH solution to 1.2 l of water.
+Nanolabs standard solution in the KOH baths has a concentration of 28 wt% and is mixed of 1 liter of a premade 50wt% KOH solution to 1.2 l of water.
-If you want to make your own mixture of KOH in a beaker in Fumehood 6 you can either do this by using KOH pills or a premade mixture of 50wt%. Using the pills the mixture will spontaneously heat up when mixing which is not the case when using the premade mixture.
-If you want to make solution using the KOH pills you must remember that the pills are only 85% pure.
 For 1 l of water you can calculate the required amount of KOH pills (X) to achieve the desired concentration in wt% (Y) by:
-<math> \frac{(0.85 \cdot X)}{(X+1000g)}=Y</math>
-<math>X=\frac{(Y\cdot 1000g)}{(0.85-Y)}</math>
-So for a 10wt% solution you will need 133 g pills for each liter of water.
 If you use the 50wt% premade KOH solution you can calculate the amount of solution X you need to add 1 liter of water to achieve a concentration of Y wt% by: