Aug 15, 2008. /Lesprom.com/. Moody's Investors Service upgraded Domtar Corp., citing improved credit protection metrics, progress made in the integration of Domtar and Weyerhaeuser's fine paper assets, management's commitment to debt reduction, and expectations of continued strong operating and financial performance, Thomson Financial News reported. The corporate family rating was raised to 'Ba2' from 'Ba3', senior secured rating to 'Baa3' from 'Ba1', senior unsecured rating to 'Ba3' from 'B1', and its speculative grade liquidity rating revised to 'SGL-1' from 'SGL-2'. The rating outlook is stable. However, the agency added that lack of product and geographic diversification, and volatile pricing for fine paper and lumber are constraints on the ratings.