MIL-DTL-98B
4.1.2.1.1 Preparation of composite sample (after packing). A primary sample of
approximately 2 ounces of diphenylamine shall be removed from each of the 8 containers in
order to equal 16 ounces. If there are less than 8 containers, a primary sample in sufficient
quantity to equal 16 ounces shall be removed from each container. The individual primary
samples shall then be combined in order to form a homogeneous sample of 16 ounces. The
determination shall be performed as specified in 4.2. If the composite sample fails to comply
with any of the requirements specified the lot shall be rejected.
4.1.2.1.2 Prior to packing. Equal primary samples shall be taken from different places
and depths so as to form a representative sample of the lot. The individual primary samples shall
then be combined in order to form a homogeneous composite sample of 16 ounces. The
determination shall be performed as specified in 4.2. If the composite sample fails to comply
with any of the requirements specified, the lot shall be rejected.
4.1.2.2 Molten DPA in bulk storage container. A sample of 2 ounces shall be taken in
duplicate from a closed-out bulk storage tank. The closed-out bulk storage tank shall be
circulated for one hour minimum prior to sampling to assure a representative sample. The bulk
storage tank shall be assigned a lot number. No new molten DPA shall be transferred into the
closed-out bulk storage tank. If the sample fails to comply with any of the requirements
specified, the lot shall be rejected.
4.2 Methods of inspection. Test methods and procedures shall be performed as specified
in paragraph 4.2.1 to 4.2.6.
4.2.1 Determination of setting point.
4.2.1.1 Drying the sample. Grind 80 to 100 grams (gm) of the sample fine enough to
pass through 1680 micron screen in American Standard Testing and Material E11 and dry for
four hours at 40 degrees C., or melt the sample then add 20 gm. of anhydrous calcium chloride or
sodium sulfate, and stir the mixture for 15 minutes at a temperature of 80 degrees C., allow the
mineral salts to settle and pour off the molten diphenylamine.
4.2.1.2 Apparatus. A solidification point apparatus shown in Figure 1 shall be used with
a 76 millimeter partial immersion number American Standard Testing and Material E1 type 92 C
or equivalent thermometer with a range of 40 to 70 degrees C.
4
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business