Main question: ON HIGH VOLUME DOUBLE SIDED POWER BOARDS. WHAT PERCENTAGE DIFFERENCE WOULD THE PRICE INCREASE BE, OF A STANDARD MANUFACTURABLE BOARD PRICE SHOULD I SEE (of .001" minin the hole), IF ANY, TO A TOTAL FINISHED THICKNESS OF 2 OUNCE COPPER ? (please read below to find out what my vendor says they can do without increasng the price) History: My boards are power boards requiring a total of 2 ounce copper on the surface and a minimum of .001" in the holes. These are submitted to UL for approval of our product with the accurate requirements, because at least my prototype house reads my print and gives me what I require. My prints states: * .001" minimum (not average minimum) copper in the holes * one ounce copper foil and another ounce plated on the surface foil. I am aware that the copper plating process plates a ratio of 1:0 in the hole to 1:2 on the surface. Therefore, .001" minimum plate in the hole should result in .0012" plated on top of the surface foil. I would assume that no vendor would risk plating the absolute minimum and therefore would attempt to plate .0012" in the hole, resulting in .0014" plate on top of the surface foil. I am aware that 1 ounce foil has a tolerance of +/- .0002" on the foil thickness. I am also aware that deburring , scrub and micro-etch may remove another .0002" from the surface of the foil. Based on this, the absolute minimum should be -> .0010" foil + .0012" plate = a total copper thickness of .0022" . Whereas, my copper hole requirement is .001" minimum with the maximum controlled by the hole size and tolerance. I expected to receive boards with 2 ounce finish minimum copper thickness and copper thickness in the hole in excess of .001" to reach the surface thickness requirement. WAS I WRONG?? ( please to not reference IPC-A-600 as my print takes precedence over that spec.) My Production Fabrication Vendor states the best they can give us .0020" - .0025" on the surface for our specified 2 ounce copper .0028" requirement. Needless to say they were not giving us close to that before. (so I will believe an improvement it when I see it). The fact is, if we accept their minimum of .0020", aren't we now still under the .001" minimum in the hole?? My Vendor also stated that there would be a price increase if a total of 2 ounce total was required. Seems to me, if they took the job, they should of been able to do the work requirements! Lets just say I have a tolerance on the 2 ounce of .0004" minus and .001 plus (just to have a plus) which is about 15% of .0028". Aren't I really only asking them to produce boards that will have .0002" more that what they should be giving me already. Should that cost me?? Thanks in advance!