10 Properties of Powder Coatings!

1 Powder particle size

Unreasonable particle size distribution will adversely affect the powder coating and coating appearance

2 Heavy metal content

Excessive heavy metal content will cause adverse effects on the human body and the environment

3 Lower explosive limit of powder

The supplier should inform the customer of the lower explosion limit of the powder to avoid flash explosion accident during use.

4 Powder density

If the density is too large, it means that there are too many fillers or inorganic pigments in the powder, and the corresponding resin will be too small, which is not conducive to the infiltration and dispersion of the powder when it is melted.

5 Powder burning residue

The ignition residue of the powder is essentially the content of inorganic substances that cannot be burned.

6 Hiding power of powder

Hiding power reflects the ability of the powder to cover the color of the substrate
.
Powders with high hiding power can achieve complete coverage of the color of the substrate under the condition of low film thickness, and indoor powders have higher requirements on hiding power
.
The covering power mainly evaluates the covering power of the powder.
The covering power of the light color is low.
When designing the formula, the amount of pigment added should be determined according to the thickness of the workpiece sprayed, which can save costs and make the performance better
.

7 Powder deposition efficiency

The deposition efficiency can indirectly reflect the particle size distribution of the powder and the resin content in the powder
.
Generally, the higher the deposition efficiency, the lower the fine powder ratio or the higher the resin content, which can be detected according to the provisions of GB/T21785.
10
.

8 Fluidity of powder

The fluidity has a great influence on the construction quality of powder spraying.
The powder can have a good spraying effect only after the powder is fully fluidized.
The fluidization value exceeding the specified range will cause adverse effects on the spraying process.
Test according to GB/T21782.
2 Powder flow coefficient of 120 ~ 180g is qualified
.

9 Storage stability of powder

The powder should have good storage stability, and the use of the powder will not be affected by the storage and transportation process
.
Poor storage stability can easily lead to clogging of the spray gun and poor powder application during the spraying process, and even affect the coating effect
.
The inspection of powder storage stability shall be carried out according to the provisions of GB/T21782.
8
.
According to the storage characteristics of this standard powder, the test temperature is 40°C+0.
5°C, and the stability is less than grade 2 as qualified
.

10 Appearance quality of powder

If the color is uneven, it may cause uneven color after spraying, resulting in local color difference; the powder is not loose enough, indicating poor fluidity, the powder may be damp, which will affect the fluidization of the powder.
The phenomenon of "powder bag" occurs on the workpiece after spraying
.