FED-STD-228A
Method 7231.1
18 APRIL 2014
LEAD SHEATH, COMPOSITION
1. SCOPE
1.1 This method is intended for use in determining the composition of lead sheath of insulated wire and
cable. Procedures are described for the determination of copper, bismuth, arsenic, antimony, tin, iron,
zinc, and silver. The amount of lead present is determined by the difference.
2. SPECIMEN
2.1 The specimen should consist of approximately the following amounts of lead sheath taken from the
inspection unit:
2.1.1 Copper and bismuth determination as specified in 4.1.1.
2.1.2 Arsenic, antimony, and tin determinations 50 grams.
2.1.3 Iron determination 50 grams.
2.1.4 Zinc determination 50 grams.
2.1.5 Silver determination 100 grams.
3. APPARATUS AND REAGENTS
3.1 The apparatus shall be as follows:
3.1.1 Arsenic distillation apparatus. The apparatus shown on figure 7231C shall consist of a 500-ml.
Erlenmeyer flask fitted with a ground-glass stopper carrying a ¼-inch glass distillation tube, a
thermometer, and a 2-mm. inside diameter glass capillary pressure regulator which extends to within 1/8
inch of the bottom of the flask.
3.1.2 Beads, glass.
3.1.3 Buchner funnel, approximately 5-cm. in diameter.
3.1.4 Colorimetric tubes, 100-ml or suitable colorimeter or spectrophotometer.
3.1.5 Compressed air source.
3.1.6 Crucible, Gooch, with asbestos pad.
3.1.7 Cylinder of carbon dioxide.
3.1.8 Flask, glass stoppered iodine, 250-ml.
3.1.9 Glass wool or cotton.
3.1.10 Hydrogen sulfide generator.
199
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business