Dec 19 (Reuters) - SDI Ltd SDI.AX :
* SALES ARE EXPECTED TO INCREASE BY APPROXIMATELY 6% FOR SIX MONTHS ENDING 31 DECEMBER 2018
* EXPECTS THAT FORECASTED SALES WILL PRODUCE AN AFTER-TAX PROFIT IN RANGE OF $1.9M TO $2.4M FOR SIX MONTHS ENDING 31 DECEMBER 2018