Chapter 5 - Environmental Testing Flashcards
0
Q
Describe relative humidity.
A
The amount of moisture in the air compared to saturation level
1
Q
Identify some of the defects that can be caused be incorrect application temperatures.
A
- Failure to cure
- Too rapid solvent evaporation
- Poor film formation
2
Q
What is the dew point temperature?
A
The temperature at which moisture will begin to form on a steel surface.
3
Q
Name so of the effects wind may have on a coatings project.
A
- blowing abrasives
- causing excessive drift or overspray
- accelerating solvent evaporation
- contributing to the formation of dry spray
4
Q
What are the common errors when using an electronic hygrometer?
A
Failure to acclimate the instrument to the environment with adequate time.
5
Q
Explain the process for use of the sling psychrometer.
A
- Make sure the wick is wet and clean
* Continue to “sling” until 3 consecutive readings are achieved
