Powder coating-quality&testing

andrewfei

Testing - The cured powder coating film can be
checked for a wide range of characteristics. Depending
upon the specification, various tests need to be carried
out on test panels of each production batch before the
coated product can be shipped to the customer. See
Table 4 for a listing of some of these testing methods.
For most tests there exists a value with a negative and a
positive tolerance. The actual figure should always be
within the tolerance range. Many of the performance
criteria have internationally standardised procedures for
the test methods and can therefore be easily compared.
Details of some of the most common tests used across a
range of industries are listed below together with
examples of relevant testing standards.
It is important to note that for any particular powder
coating application there may be a technical
specification or quality standard to be met which refer
to specific tests and testing equipment.
Table 4: Test Methods – Comparisons
Test Method ISO DIN ASTM BS NFT
Film Thickness 2178
2360
D1186
D1400
3900D5
Gloss 2813 6730 D 523
Colour - Visual
- Colorimetric
3668
7724
D2244
3900D1
Adhesion (Cross-hatch) 2409
D2197
D3359
3900E6
Impact Resistance 6272 D2794 3900E3
Cylindrical Bend Test 1519 53152 D1737 3900E1 30040
Conical Bend Test 6860 D 552 30078
Edge Coverage 296
König Pendulum Hardness 3711 53157
Persoz Pendulum Hardness 1552 30016
Buchholtz Indentation 2815 53153 3900E9
Scratch Resistance 1518 D2793 3900E2
Erichsen Cupping Test 1520 50102 3900E4 30019
Pencil Hardness D3363
Taber Abrasion Resistance
53774 D 968
D4060
30015
Humidity Resistance 6270 5017 3900F2
Kesternich Sulphur Test 3231 50018 3900F8
Salt Spray Test 9227 50021 B 117
Acetic Acid Salt Spray 3769 6496 C15