FED-STD-228A
Method 2011.1
18 APRIL 2014
FLEXIBILITY, INSULATION, LOW TEMPERATURE
1. SCOPE
1.1 This method is intended for use in determining the resistance of insulating and jacketing compounds
to cracking when bent at low temperatures.
2. SPECIMEN
2.1 This specimen should be a piece of the inspection unit of sufficient length for testing, as described in
4.2. When testing the insulation, all outer coverings should be removed.
3. APPARATUS
3.1 The apparatus shall be as follows:
3.1.1 Mandrels shall be of a standard size in one of the following diameters:
1/16
(0.0625)
1 21/32
(1.6562)
3/32
(0.0938)
1 15/16
(1.9375)
(0.1250)
1/8
2 3/8
(2.3750)
(0.1875)
3/16
2 7/8
(2.8750)
(0.2500)
1/4
3 1/2
(3.5000)
(0.3750)
3/8
4
(4.0000)
(0.5000)
1/2
4 1/2
(4.5000)
(0.6875)
11/16
5
(5.0000)
(0.8438)
27/32
7 1/2
(7.5000)
(1.0625)
1 1/16
11
(11.0000)
1 5/16
(1.3125)
The standard size selected shall be the largest size which does not exceed the value computed in
accordance with table I. The 0.0625-inch mandrel shall be used when a smaller size than 0.0625 is
indicated by the computation.
3.1.2 Cold chamber, such as a refrigerator or other equipment, capable of maintaining the mandrel and
specimen at the required temperature ± 1°C. (2°F).
4. PROCEDURE
4.1 The specimen shall be subjected to a temperature as specified in the detail specification or
specification sheet for a period of 20 hours ± 1/4 hour, except when otherwise specified in the detail
specification or specification sheet.
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