building doors and windows are not insulated, home bathroom glass is easily broken, high rise glass falls in the wind... These are all related to the thickness of the glass. In January 2010, the provincial industry and Commerce Bureau United State glass quality inspection center, China building glass and Industrial Glass Association, in Wuhan, Xiantao, Jingzhou three market spot check 15 batches of flat glass. As a result, the plate glass with a thickness of 4 millimeters in the national standard is only 3.6 millimeters, 3.4 millimeters and even 3 millimeters in the market. There are 14 batches of suspected unqualified products, and 93% of the suspected unqualified products are suspected. Zhou Zhiwu, Deputy Secretary General of China building glass and Industrial Glass Association, said that shrinking has become a major hidden rule in the glass industry. Because of the general public's ignorance of this trend, this unhealthy trend is becoming increasingly fierce.