1.MDA-100 contains more than 99.0% of 4,4 '- methylenedianiline and a small amount of 2,4'-methylenedianiline.

       Heze Yonghui composite material co.,Ltd, founded in 2008 and located in Dongming County, Heze City, the capital of peony in China, covers an area of more than 30000 square meters. It is specialized in the R&D, production and sales of special epoxy curing agent raw materials. The main products include 4,4 'diaminodiphenylmethane (MDA series products), DDM series products, Z-113 epoxy resin curing agent, MTPHA, MHHPA and other products. Our products are widely used in industries such as insulating paints, dye industry, bismaleic resin, carbon fiber composites, adhesives, heavy anti-corrosion of oil pipelines, battery glues, epoxy coatings, potting of electronic components and so on.
       At present, we have more than 100 employees, including 2 postdoctors, 2 professor level senior engineers and a more than 10 professional R & D team. Yonghui attaches importance and respects talents and vigorously implements the strategy of revitalizing the enterprise through science and technology. We also signed long-term cooperation contracts with universities like Fudan University, Zhejiang University and other institutions for higher technical cooperation. We have already built a modern laboratory and professional technical R&D team. Under the team's hard working, we have completed a number of independent intellectual property rights and acquired advanced R&D experience. Today Yonghui has developed into a high-tech enterprise with advanced R&D strength.
      Yonghui has always followed the principle of "Excellent Quality and Considerate Service", and has been committed to strict control of product quality for many years. We have passed ISO 9001:2008, ISO 19001:2016 quality system certification and EU REACH certification. We adhere to quality standardization and safety standardized production, and provide the most professional services guided by the actual needs of customers.
     For decades, our products have not only been welcomed by many domestic customers, but also have independent import and export rights. Our products are exported to more than 20 countries and regions from North America, Western Europe, the Middle East and Southeast Asia. We sincerely welcome new and old customers at home and abroad to negotiate and cooperate.