FED-STD-228A
Method 7001.1
18 APRIL 2014
CHEMICAL TESTS; GENERAL
1. SCOPE
1.1 This section describes various chemical test methods for insulated wire and cable. Methods are
described for the determination of resistance of coverings to acids and alkalies, armor and conductor
coatings, mineral content of coverings, composition of lead coverings, and the qualitative identification of
elastomers in insulation and sheath. The qualitative methods include tests for natural rubber for the
purpose of a more positive identification.
2. SPECIMEN
2.1 Preparation of specimens of insulation and sheath for qualitative tests. Three or four-gram portions
of the insulation or sheath should be taken at different places on each inspection unit in the sample.
Each portion should be cleaned of any adhering material and ground by passing three or four times
through a clean cold laboratory rubber mixing mill with the rolls set close. A total of at least 15 grams of
the ground material should be prepared for the qualitative tests. Specimens should be taken from this
composite sample for use in the various qualitative tests described in method 7251.
2.1.1 If the uniformity of the composition of the insulation or sheath of the sample is in doubt, a ground
portion from each inspection unit should be prepared, separately and tested.
2.2 Specimens for the other chemical tests should be taken from the inspection unit and prepared for
tests as described in the individual test method.
3. APPARATUS AND REAGENTS
3.1 The following general laboratory apparatus and reagents shall be available. Special apparatus and
reagents are described in the individual methods.
3.1.1 Apparatus
3.1.1.2 Analytical balance and weights.
3.1.1.3 Baths, water, steam.
3.1.1.4 Beakers.
3.1.1.5 Burners, gas.
3.1.1.6 Burettes.
3.1.1.7 Cheese cloth or other wiping cloth.
3.1.1.8 Crucible tongs.
3.1.1.9 Desiccators.
3.1.1.10 Drying oven, ventilated.
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