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Baige Dao standard grade

Date: 2022-01-07 20:46
Views: 4520
Abstract:

The checkerboard knife is used to evenly draw a square with a certain size. The adhesion degree of the coating film to the substrate is evaluated by evaluating the integrity of the coating film in the grid, which is expressed as "grade". It is mainly used for the determination of adhesion of organic coatings by cross cut method. It is not only suitable for the laboratory, but also for the construction site under various conditions.

According to the following standard grade, the adhesion of the cross cut results is in accordance with the following standards
ISO grade: 0
ASTM grade: 5B
The edge of the cut is completely smooth, and there is no peeling on the edge of the grid
ISO class: 1
ASTM grade: 4B
There are small pieces of spalling at the intersection of the incisions, and the actual damage in the grid area is not more than 5%
ISO class: 2
ASTM grade: 3B
The edge and / or intersection of the incisions were exfoliated with an area greater than 5% but less than 15%
ISO class: 3
ASTM grade: 2B

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