What are the standards of Hubei natural gold granite stone?

It has been done for more than ten years stone Neither the material nor the human know it. First, according to national standards, stone The material can be divided into two levels, superior and qualified stone For materials, the error within plus or minus 1mm belongs to excellent And positive and negative two millimeters are regarded as qualified. Take a look at the hotplate and litchi noodles. The requirements for superior products are plus one minus two. The requirements for qualified products are plus two minus three. However, in the actual production process, people often do it according to industry standards. For example, the smooth surface of indoor pavement may not be very strict with the thickness requirements. However, the requirements for length, width, diagonal and flatness are particularly high, and generally they should be about plus or minus 1mm. The second is dry hanging stone. Because the dry hanging stone needs to leave glue joints, the stone error can be controlled within plus or minus 2mm. Multi purpose stone for garden paving B Generally, the error of 3mm in factory production is normal. The requirements for the width of the road edge are particularly strict and must be accurate, while the height is not so strict, and some of them can be less than half a centimeter.