Hi, > You can get more even heating by placing ceramic tiles above and below > the PCB. This may also help reduce thermal shock from turning on the > coils. I would advice to use very thin ceramic material or the big thermal mass would cause temperature to change very slowly and you would not get the right "curve". Besides I prefer to have infrared radiation directly to the board and the ceramic material might kill it. Best regards, Alexandre Guimaraes alexg@iis.com.br -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.