The key equipment for the production of caustic soda in the final concentrator, the high concentration and high temperature caustic soda usage environment, has high requirements for the material and manufacturing of equipment. China is a major producer of caustic soda, and we have cooperated with many domestic caustic soda plants. The on-site equipment has provided us with a lot of data, and we have made a lot of technical optimizations based on this, including material and structural optimizations. The equipment produced by our company has been running continuously on the device for 6 years without any leakage, and we are currently continuing to refresh the record of this data.