Tianjin Zhongde Trade and Industry CO., Ltd is experts on steel liner for UPVC door & window, steel auxiliary frame for UPVC door & window, special shape tube , RHS and SHS in 23 years. Annual output could reach to 15,000 tons. Kommerling kunststoff Co., Ltd cooperated with us from 1995. And we also cooperate wit Veka, Rehau, Dimex and lots of UPVC companies. Our steel liner export to more than 20 countries.
In our company, we have professional machines, stander production process,strict quality control,do as steel liner’s high technology leader, Management as the guarantee, talented employees support scientific ideal. Then we could do as the leader on the steel liner, offer high quality,good price and Scientific solution for inland and out land UPVC companies.
The steel liner size designs by the PVC profile in side, then could max add Wind pressure resistance moment of inertia. Which will let the hardware fitting perfectly contact with steel liner, the doors and windows are strong and durable.