Mudanjiang Hongli Chemicals Co. Ltd.

Manufacturer of oxalic acid, diethyl oxalate and tetramethyl guadinine. With technical data.
http://www.honglichem.com/

Travel China Guide: Heilongjiang

Basic facts, with further coverage of Harbin and the main sights.
http://travelchinaguide.com/cityguides/heilongjiang/index.htm

Mountain Abrasives

Manufactures and exports green silicon carbide.
http://www.abrasive-grain.com/