| Simple Operation |
| Apply the dry powder to a rigid substrate. Locate an area
sufficiently large to permit both stand-offs (end tabs) of the gage to rest
on the substrate in the same plane. |
| 1 - |
Push the Powder Checker perpendicularly into the dry powder
so that the two stand-offs rest firmly on the substrate. Some compressed
powder may lie between the substrate and the two stand-offs. |
| 2 - |
Move the Powder Checker along the surface of the coated part for at least
1/2 inch. Keep the gage perpendicular to the plane of the substrate. This
movement allows the stand-offs to burrow down to the substrate and for one
or more of the teeth to drag the surface of the dry powder and leave furrow
lines. |
| 3 - |
Remove the Powder Checker and examine the powder. The thickness lies between
the shortest tooth making a line in the powder and the clearance of the
next shortest tooth not touching the powder. Examine the teeth for verification.
Film thickness is determined to lie between the shortest tooth with powder
adhered electrostatically and the next shorter tooth without powder. Example:
The 3 and 6 mil teeth both make lines and have powder clinging to them but
the 9 mil tooth does not. The uncured powder thickness is determined to
be between 6 and 9 mils. (see Figure 1) |
Clean the Powder Checker after each reading with a dry
cloth or dry paint brush so that subsequent readings are not affected.
Note - Most powders cure to approximately 50% of their dry thickness.
Marks left by the gage may affect the characteristics of the cured film.
|
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