1.Good quartz products smell very natural as stone and are produced by environmentally friendly material.Defective quartz products contain glue added formaldehyde in the production,sheet metal of production had a very strong smell of formaldehyde.
And this quartz products can not choose to buy,even if lower price. It damages to health.
2.Surface having pores are not good quartz products.
3.Splicing gap being not obvious that is good quartz product.
4.Striking the surface with a key or a knife show deep scratches,which means bad products.
5.Using sandpaper with 200 mesh or less to grind.If falling powder, it means that the product is defective.
6.Cutting surface of quartz tube has cracked, which is defective product.