 Wildland
Fire Chemicals
Evaluation of Wildland Fire Chemicals
Standard Test Procedures (revised 5/15/06)
STP 9.2—Enhanced Water Mixture Evaporation Rate
Summary:
A petri dish or other similar container, filled to a known depth with
test product can be dried to constant weight at a moderate temperature
in a drying oven. The time required to reach constant weight can be
compared to the performance of other products.
Equipment:
- Disposable petri dish, about 3.5 inches in diameter and 0.5 inch tall
- Balance, readable to 0.001 grams
- Drying oven
Test Method:
- Weigh an empty petri dish, about 3.5 inches in diameter and 0.5
inch tall with straight sides.
- Put a measured depth of water
enhancer mixture in the petri dish and tilt slightly to spread
evenly. The
amount of water enhancer will be varied to approximate enhancer
layers of 0.1 inch, 0.25 inch, and 0.5 inch.
- Weigh the petri
dish and
water enhancer mixture.
- Place the petri dish and water enhancer
mixture in a drying oven at 100 °F.
- Record the weight of the
petri dish and water enhancer mixture at 30-minute intervals
until 8 hours have passed or the weight remains constant.
- Prepare
a graph of weight versus time of drying for each trial.
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