Process It is a low cost rotary etching machine ideally suited to the manufacture of prototype and small batch quantities of PCBs. As well as etching the unit can also be used for spray developing and spray resist stripping. The machine is of a sturdy PVC construction and is mounted on a stand which places the machine at a convenient working height. Etching solution is contained in a tank at the base of the machine. It is heated by a powerful quartz heater which assures a short warm up time and constant temperature which is controlled electronically. Boards Boards up to 300 x 400mm can be etched although several smaller boards can be placed in the special board carrier, the handle of which protrudes out of the machine eliminating operator contact with the etchant. Control The machine etches one side at a time and so for double sided PCBs the board holder is rotated 180º before the second etching cycle. In front of the etching chamber is a built in overflow wash tank for the rinsing of the etched boards. The triangular form of the body of the machine makes it ideal to place in a corner of a room. Resolution The efficiency of this spray etcher has been proven by line resolution of better than 0.1mm and etching speed of only 90 seconds with fresh ferric chloride. Specification Maximum Panel Size: 300 x 400mm Sump Capacity: 20 litres Dimensions: Width 650 x Depth 690mm Electrics: 220-240V/50Hz 1ph. MANUALS: Complete with softcopy and 3 copies of each of the following manuals in English are to be supplied: a. Operation/Maintenance Manuals. Must be comply with international standard. INSTALLING AND  COMMISIONING Installing and commissioning must be done within1 month from the date of delivery at no additional cost from polytechnic. TRAINING AT SITE Duration: minimum 1 days No. of participant: minimum 5 persons nominated by the institution. Objective: The trainee must be able to operate and run all the equipment and experiment. WARRANTY The vendor should warranty the equipment for at least 2 year for part and labour