After years of accumulation of technical experience, a lot of scientific and reasonable ways have been summarized, and relevant arguments have been carried out in a scientific and reasonable way after continuous research, not only through one-sided answers to questions but scientific and reasonable multi-faceted examination, such as the problem of removing rust in the original guardrail products. After the technical review, I concluded that a number of ways to solve this problem are continuous experiments, and solve the problem in the right way.

We have a special laboratory with relevant professional personnel in this area for many times to carry out tests on the chemical composition of cast iron guardrail to improve the more perfect, through hundreds or even thousands of times after the summary of the method is very conspicuous, there is no scientific and reasonable way to create high-quality it. What is successful must be done by professionals and not tested in some primitive old way. 

This conclusion is very wrong in many cases will cause error, in this process only continuous improvement to create more boutique, we will continue to create high-quality cast iron guardrail direction forward.