ARMY TM 10-1670-279-23&P
AIR FORCE T.O. 13C5-27-2
NAVY NAVAIR 13-1-28
2-14. Acidity Test.
This task covers:
Packing Paddle, Item 10, Appendix B
43E(10) Parachute Rigger
Medicine Dropper, Item 12, Appendix D
Three-Color pH Paper, Item 13, Appendix D
Layout on packing table or other suitable area.
Spool with Color Chart, Item 18, 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 item in intended
test area. If water drops do not penetrate material, gently rub moistened area with a flat side of a clean metal
(2) Tear a suitable length of colorimetric pH paper from dispenser, place piece of pH paper on wetted area and
press full surface of paper against material with a flat side of packing paddle used in step (1) above. Ensure
the pH paper becomes thoroughly wet.
(3) Using color comparison chart enclosed in dispenser, compare the color of 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 condemned and processed for disposition in
accordance with paragraph 2-13.
(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.