1, smells very natural taste, smell the smell of the defective stone quartz stone is produced in the process of adding the formaldehyde glue, the quartz tube is the environmental protection material production. The plate to produce formaldehyde flavor is very strong, the price can not be sold at a quartz tube election ah, endanger life!
2, there are holes in the quartz tube is not good, the surface is not a stoma?.
3, not obvious for good products, stitching gap.
4, scratches are deep and obviously unqualified, keys, or pencil sharpener.
5, simple drop stone powder for substandard, 200 eye following sandpaper grinding.
6, through the incision, we can also identify the quality of quartz problems, there are split crack for unqualified, cut the surface of the upper and lower sides.
