Hello all I have a problem of having non uniform surface tension on the silicon Nitride wafer. I tested it by putting some water on the surface and found that water was spreading away from some region on the wafer while other area was having water on the surface.It looks like there is some hydrophobicity on the wafer. Can any one suggest me the way to tackle this problem and get uniform surfac tension (uniformity) on the surface of the Silicon Nitride wafer. Thanks Gururaj Shenoy Louisiana Tech university _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp