How to build a thermoelectric lamp

Step 12 Insulate the peltier

Now you need to make a thermal insulator for between the heat sink and the fire tin.  Cut a square out of the foil the same size as the peltier chip and fit this over the peltier. Fill around the sides with 5mm thick strips of rockwool. Fold the foil over and you should end up with something like this. Don't worry if it is too thick as the bolts will compress it when tightened.