# cleanroom accessories * Harmony Cleanroom # etchants * Local grocery or home improvement store * * Whink brand rust remover contains 2-3% HF. * Duda Diesel * * HCl for metal etching # photoresist * Injectorall * * Shipley SP24 positive photoresist. DNQ-novolac based, peak sensitivity at 405nm. # solvents * Duda Diesel * * Technical grade acetone and isopropanol. May have lower impurity levels than hardware/paint store grades. * Local hardware store * * Acetone, denatured alcohol. May have lower purity. * Harmony Cleanroom * * 99% isopropanol / 1% DI water. * Pharmacy or some grocery stores * * Isopropanol (rubbing alcohol). Go for the highest concentration you can get (91% is ideal) # wafers * MTI - Materials science related supplies including wafers up to 6 inch diameter sold in units of one. * University Wafer - Has a wider selection than MTI but minimum orders are high. * Singapore Optics Shop - This supplier does not have much of a minimum order (Keep orders above or equal to 5 wafers) but prices can be quite high for small wafers. They do have other wafers like Germanium and also has quite a lot of other cool stuff. They do ship to countries outside Singapore. Price will include SGD $30 handling fee. * Latech Scientific Supply - I am putting them back on here after they have updated their information. They do have a minimum order of 25 pieces for wafers of size 3 inches and above. According to their sales representative, wafers smaller than 3 inches can be bought in small quantities. If you want to get a large amount of wafers, I suggest using Latech as their prices are cheaper than the ones at Singapore Optics Shop. They also have some lab stuff that experimenters might be interested in. # other vendors * *