Project Introduction

The B格尔 test is used to evenly draw squares of a certain specification size. It evaluates the integrity of the coating within the squares to determine the adhesion of the coating to the substrate, expressed in 'grades'. It is primarily used for measuring the adhesion of organic coatings using the cross-hatch method, and is applicable not only in laboratories but also on construction sites under various conditions. Generally, it is a tool to test the adhesion after the object has been coated. According to the Japanese Industrial Standard (JIS), it is divided into grades 1 to 5, with higher grades indicating stricter requirements. When the customer specification requires grade 5, it means that there should be no detachment at all.

According to the Japanese Industrial Standards (JIS), it is divided into levels 1 to 5, with higher levels requiring stricter standards. When the customer specification requires level 5, it indicates that there should be no detachment at all.

Regarding the grid and tape test methods: The blade width is approximately 10mm to 12mm, with an interval of 1mm to 1.2mm between each mark, totaling 10 grids. Straight lines are drawn down to create 10 evenly spaced lines of blade marks. Drawing perpendicular to these lines results in a 10x10 grid of 100 squares. When the grid blade is applied, it should cut through to the base material, not just the coating, otherwise the test is invalid.

After the cross-hatch scoring is complete, the tape test must be conducted to ensure no detachment. First, apply the tape over the cross-hatch area, pressing it down firmly with your fingers to secure a tight bond. Then, pull the tape off with a quick, decisive motion. Inspect the material for any paint detachment. Additionally, not just any tape will do; according to JIS standards, it must match the brand and model. For instance, 3M's Transparent Tape 600, which comes in two sizes: 3/4 inch width and either 1296 inches or 2592 inches in length.

Verify product surface coating or ink adhesion performance through the cross-over method or tape test, used to assess the surface treatment process of the product.

Method Standard

GBT9286-1998 Scratch Test for Coating Films of Paints and Varnishes