How is the sampling procedure?

Depending on the type of sample that has different sampling standards, QCVN16:2019/BXD has regulations on specific sampling specifications.

Example: natural paving stone: 7 samples of size 100x200mm and 5 pieces of 47x47mm

Tiles: 5-10 whole bricks

Tempered flat glass: 3 models 610x610mm and 6 samples 100x300mm

Insulated sealed box glass: 6 models 350x500mm