On the moring of August 23, a batch of Mining waterproof and airtight doors, which produced by Shandong China Coal Group, are officially loaded and will be sent to Longkou, Shandong Province.  
These  Mining  waterproof and airtight doors which will be sent to Longkou  were self-produced by Shandong China Coal Group, and all of doors  passed the National coal safety certification. In order to prevent suddenly underground leaks,  mining waterproof and airtight doors are mainly  used  in  channels which lead to the bottom station. Channels are between Underground main substation and main drainage pump station. This kind of products have lots of  advantages, such as quick shut down for a short time, durable, good sealing performance, ease of use and so on. For a long time, our products have been widely recognized by customers in domestic market and overseas. 

For many years, with the concept of "credibility is the quality of life for survival", equipment of Shandong China Coal Group never have any quality problems, and share big market. In the future, with the aim of producing more high quality products and providing high quality service for customers, Shandong China Coal Group would make brand of "china coal " more and more famous in the world.