FED-STD-228A
Method 7011.1
18 APRIL 2014
RESISTANCE TO ACID AND ALKALI
1. SCOPE
1.1 This method is intended for use in determining the resistance of the fibrous covering and armor on
insulated wire and cable to acids and alkalies. It is applicable to single and multiple conductor cable with
non-metallic armor and a saturated fibrous over-all covering.
2. SPECIMEN
2.1 The specimen should be a piece of the inspection unit 12 inches in length.
3. APPARATUS AND REAGENTS
3.1 The apparatus and reagents shall be as follows:
3.1.1 Balance accurate to 10 milligrams.
3.1.2 Glass container of sufficient size for complete immersion of the specimen.
3.1.3 Glass framework or other device for supporting specimens so as to prevent them from touching
each other or the surface of the container.
3.1.4 Water bath, equipped with cover, capable of maintaining the specimen at the required temperature
within ± 0.5°C (1°F).
3.1.5 Acetic acid, 5 percent solution by volume.
3.1.6 Calcium hydroxide, saturated solution.
3.1.7 Sodium hydroxide, N solution.
3.1.8 Sulphuric acid, b percent solution by volume.
4. PROCEDURE
4.1 Unless otherwise specified in the detail specification, the following solutions shall be used for
immersion of the specimen:
(a)
Normal sodium hydroxide solution.
(b)
Saturated calcium hydroxide solution.
(c)
Sulphuric acid, 5 percent solution by volume.
(d)
Acetic acid, 5 percent solution by volume.
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