MIL-DTL-82633A (OS)
4.4.2 Viscosity.
4.4.2.1 Equipment.
a. Brookfield Synchrolectric Viscosimeter, Model RVT or RVF, or equivalent, with No. 5 spindle
4.4.2.2 Method. Determine the viscosity in centipoises of both component A and component B by
Method B of ASTM D 1084. Use a 1-pint paint can as the standard container and the viscosimeter
without cylindrical calibration sleeves. Condition samples at 75 ± 5 ºF for a minimum of 2 hours (hr)
prior to determining the viscosity. For both components, use spindle No. 5 at 10 revolutions per minute.
4.4.3 Flash point. Determine the flash point of component A and component B in accordance with
ASTM D 92.
4.4.4 Exothermic temperature.
4.4.4.1 Preparation of test sample. Prior to mixing, condition component A and component B at
75 ± 5 °F for 4 hr, without a constant temperature bath. Condition all containers and probes to be used in
the test at the test temperature at the same time.
4.4.4.2 Procedure. Use the following procedure to determine exothermic temperature.
a. Use 1-gal cans to contain the two individual components and to contain the final mixture. Weigh
1 ½ lb of each component into individual containers and slowly stir each component separately by hand
with a wooden paddle for 3 minutes, avoiding the entrapment of air.
b. Combine the components in the recommended ratio to provide a convenient working quantity.
c. Start the stopwatch, and mix the components thoroughly for 3 minutes, avoiding air entrapment by
slow agitation with a stirring rod or mixing paddle. To avoid transfer of heat, do not hold the container
by hand during the mixing operation. Record the start of mixing as the "starting time."
d. Place the sample container on a nonconducting surface in still air at the test temperature.
e. Insert a thermocouple, or other temperature-measuring device, into the geometric center of the
reacting mass, and record the observed temperature changes to the end of the test.
f. Every 15 seconds, probe the center surface of the reacting mass with the applicator stick
perpendicular to the material surface.
g. Continue recording the time and temperature until the temperature starts to drop. Record the
highest temperature reached as the peak exothermic temperature.
4.4.5 Gel time.
4.4.5.1. Preparation of test sample. Prior to mixing, condition component A and component B at
75 ± 5 °F for 4 hr, without a constant temperature bath. Condition all containers and probes to be used in
the test at the test temperature at the same time.
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