Harbin Medium- and Large Materials Technology Co., Ltd. is one of the earliest collective listed companies in my country on the National Small and Medium Enterprise Equity Transfer System (New Third Board). The stock name is: Zhongda Technology, stock code: 430538. The company has established Harbin Zhongda Plastic Doors and Windows Research Institute and PVC Profile R&D Center in the same industry. It is the eternal purpose of Zhongda Company to guide production through scientific research.

Harbin Medium and Large Materials Technology Co., Ltd. covers an area of ​​55,000 square meters and is an enterprise specializing in the production of PVC-U plastic profiles. The company has an internationally advanced twin screw profile extrusion production line, which can produce 60, 66, 70, and 80 series casement door and window profiles and 60, 75, 80 and 88 series sliding door and window profiles, with an annual production capacity of 150,000 tons. The plastic profiles produced have passed the GB/T19001-2008-ISO9001;2008 international quality management system certification, passed the product quality сг68 certification of the Russian National Measuring Standards Committee, and passed the Russian National Product Health Inspection SC06 certification. The trademark "Zhongda Leader Brand" has been in The Russian State Trademark Office was registered (registration number: NO: 266497).

In order to meet the needs of different levels of society, the Zhongda Plastic Doors and Windows Research Institute developed 66 four-chamber three-glass three-seal profile products in 2002, and the newly developed two-color co-extruded profiles, double-sided co-extruded profiles, and covers the newly developed by the Zhongda Plastic Doors and Windows Research Institute. Aluminum profiles, colored film profiles, aluminum-plastic aluminum profiles, floor spring door profiles, and PVC fence profiles are ideal door and window profiles for residential decoration, office buildings, hotels and home decoration.

In addition to producing PVC plastic profiles, Harbin Medium and Large Materials Technology Co., Ltd. also produces steel linings and processes various special-shaped plastic windows. The company produces "high-quality and high-tech" patented products that are constantly updated and renewed, and creating value-based services for customers is always the pursuit of Zhongda people.