Longou International Business (Shanghai) Co., Ltd., established in 2007, is a leading manufacturer of construction chemical additives based in Shanghai, China. With a commitment to delivering innovative materials and application solutions, Longou has expanded its reach to major global markets across Southeast Asia, the Middle East, Europe, America, Australia, and Africa. The company specializes in the research, development, and production of high-quality cellulose ethers such as Hydroxypropyl Methyl Cellulose (HPMC), Hydroxyethyl Methyl Cellulose (HEMC), and Redispersible Polymer Powders, catering to diverse applications in dry-mix mortars, concrete, decorative coatings, and more.

Longou prioritizes exceptional customer service, offering tailored formulation services and multilingual support to meet the specific needs of its clients. Backed by a dedicated team of over 100 professionals, including highly educated specialists, Longou is committed to maintaining the highest product quality and operational excellence, ensuring they remain a trusted partner in the construction industry. Their mission is to create safe, energy-efficient, and aesthetically pleasing buildings worldwide.