Chapter 5 - Environmental Testing

Question 0

Describe relative humidity.

Answer 0

The amount of moisture in the air compared to saturation level

Question 1

Identify some of the defects that can be caused be incorrect application temperatures.

Answer 1

• Failure to cure
• Too rapid solvent evaporation
• Poor film formation

Question 2

What is the dew point temperature?

Answer 2

The temperature at which moisture will begin to form on a steel surface.

Question 3

Name so of the effects wind may have on a coatings project.

Answer 3

• blowing abrasives
• causing excessive drift or overspray
• accelerating solvent evaporation
• contributing to the formation of dry spray

Question 4

What are the common errors when using an electronic hygrometer?

Answer 4

Failure to acclimate the instrument to the environment with adequate time.

Question 5

Explain the process for use of the sling psychrometer.

Answer 5

• Make sure the wick is wet and clean

* Continue to “sling” until 3 consecutive readings are achieved