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Cross Cut Adhesion Test And Paint Impact Test – a Sad Story of Losing My Old Customer

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Two years ago, when I was in the shop shelving factory, an important customer complained that, there was a serious quality problem of powder coating peeling off, in a large area on the supermarket shelves of our factory. According to our investigation, there was indeed such a problem in the production department. The cause is that the powder coating is not easily attached to the laminate,  due to the lack of an ingredient in the chemical solution used for surface treatment. On the other hand, the colleagues in the quality control department did not do any tests on the surface treatment, because of negligence.

The end of the story is very sad: the customer lost almost all his business. Until now, he did not receive all the payment. The factory also bears part of the loss, but the customer’s reputation has been irreparable.

In a fact, we later learned that during that period, not only many of our customers in our factory suffered the same quality problems, but also many manufacturers around us, who used the potions of this chemical factory also did not do testing (many factories are not even equipped with quality inspection personnel). So many customers have varying degrees of loss.

powder coating peeling off pic
powder coating peeling off pic 2
powder coating peeling off pic 3

This accident shocked me so much, and I have kept these pictures to this day. That is not only because that customer is an important customer of my business for five years, but also because just two small simple tests – cross cut adhesion test and paint impact test, can effectively prevent this kind of problem from happening.


Cross Cut Adhesion Test


With this cross-cut device, 10 horizontal and 10 vertical lines within 1 square inch. Ensure each cut goes through to the base material. Drawn on the product surface according to the ISO R1514 and ISO 2808 test standards with the knife-edge of 1mm.

Apply a strip of tape directly over the cross-hatched area. Press the tape down to ensure there are no bubbles inside. Be sure to leave a folded edge on one end of the tape.

Quickly remove the tape in less than 1 second.

Check tape for paint pigment.

By this method, we can test whether the powder coating is easy to peel off after cutting, to achieve the purpose of testing the adhesion of the powder coating to the surface of the product. This is very simple and quick, but it can effectively prevent the production of accidents in our story.

Cross cut adhesion test kit pic
Cross cut adhesion test pic
Cross cut adhesion test pic 2

Paint Impact Test


With this impact test device and according to ASTM D2794, the weight of 1KG falls freely from the high place of 50CM, and then the surface damage is observed after hitting the template. Generally speaking, forward flushing is not allowed to break, and recoil can be slightly damaged. If not, this is due to the lack of a softening and malleable component in the powder.

Paint Impact Test pic
Paint Impact Test result pic

Beside cross cut adhesion test and paint impact test, the electrostatic spraying surface must also go through the appearance, film thickness, glossiness, chromatic aberration, and other tests. Especially for the display shelf, the requirements of surface treatment are more stringent. If you are interested, please refer to our other related articles.

We must pay attention to,  and control the various risks arising in the production process to ensure the safety and long-term performance of the business. Otherwise, we will pay an unnecessary and irreparable price.

However, many customers are unable to conduct these tests in person due to various restrictions. We, RedSheep Trading, as the most professional inspection service company in the shopfitting industry, will be your first choice!

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