APS - AKZO-PQ SILICA, the equally owned joint venture between the Swedish-Dutch groups AKZO-NOBEL (aggregate turnover EUR 12 billion in 1999) and American PQ CORPORATION (annual turnover $500 million with 1,600 employed), has signed a letter of intent aimed at selling its white fillers business (precipitated silica used as filler material in a variety of products, including paints, paper and rubber compounds) to J. M. HUBER CORPORATION.