ARMY TM 10-1670-271-23&P
AIR FORCE TO 14D1-2-464-2
MARINE CORPS TM 01136B-23&P/1
2-14. Acidity Test.
This task covers:
Acidity test
Tools:
Personnel Required:
Packing Paddle, Item 20, Appendix B
43E(10) Parachute Rigger
Materials/Parts:
Equipment Condition:
Medicine Dropper, Item 26, Appendix D
Unpacked.
Three-Color pH Paper, Item 29, Appendix D
Layout on packing table or other suitable area.
Spool with Color Chart, Item 39, Appendix D
a. Fabric and Webbing Acidity Test. Components and parts that are constructed from fabric or webbing
will be administered an acidity test whenever the material is discolored, stained, or the presence of acid is
suspected. The acidity test will be accomplished using approved colorimetric pH paper, strip type, with the
color comparison chart on the side of each manufacturer's dispenser, to determine the acidity level in steps of 1
pH on a fabric or webbing item.
b. Test Procedure. Perform test as follows:
(1) Using a medicine dropper or equivalent type applicator, place one to two drops of water on the item
in the intended test area. If water drops do not penetrate the material, gently rub the moistened area
with a flat side of a clean metal packing paddle.
(2) Tear a suitable length of colorimetric pH paper from dispenser, place the piece of pH paper on the
wetted area and press the full surface of the paper against the material with a flat side of the packing
paddle used in step (1) above insure the pH paper becomes thoroughly wet.
(3) Using the color comparison chart enclosed in the dispenser, compare the color of the moistened pH
paper strip with the pH 1-3 color scale. If the color of the pH paper matches the numerical pH 1-3,
the acidity present in the material exceeds the acceptable level and the item is to be removed from
use and condemned and processed for disposition.
(4) After a packing paddle has been used as outlined in steps (1) and (2), above, thoroughly rinse and
dry the paddle before using the paddle for any other functions.
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