A-A-55278A
8/ In the determination of presence of labile sulfur in textile materials with lead acetate, two
1.50 + 0.01 gram samples from each material submitted for evaluation shall be tested. Each of
the two samples shall be cut into very small pieces and placed into separate test tubes. The
samples shall be submersed in a stannous chloride solution that contains 100 grams of stannous
chloride crystals ACS in 100 milliliters of hydrochloric acid ACS (35 percent concentration) and
50 milliliters of distilled water. A filter paper wet out with a 5.0 percent lead acetate solution
shall be placed over top of the test tube. The lead acetate solution contains 5.0 grams of lead
acetate CP reagent grade and enough distilled water to make up a 100 milliliters solution; if the
solution is not clear, add a few drops (one at a time) of glacial acetic acid until the solution is
clear. The test tube containing the textile sample, stannous chloride and wet filter paper shall be
heated over a low flame until the solution is boiling. The solution should not be heated for more
than 15 seconds. A brown to black stain on the filter paper should be evaluated as follows:
Free the filter paper shows no discoloration or staining of any kind.
Slight The filter paper shows a light tan to light brown discoloration stain.
Moderate The filter paper shows a dark brown discoloration stain.
Severe The filter paper shows a black color stain.
Table II - Coated Cloth Physical Requirements
Characteristic
Minimum
Maximum
Test Method
Weight, oz./yd.2
7.0
9.0
ASTM D3776 Opt. 7
Breaking strength, lbs.
Warp
225
ASTM D5034
Filling
210
Tear strength, grams
ASTM D1424 1/
4500
Warp
3500
Filling
-
Hydrostatic
Resistance, lbs./in2
ASTM D751 2/ 12/
100
Initial
80
AATCC-96 VI A
After 5 launderings
ASTM D751 2/ 8/
80
After 40 hours
AATCC-111A opt. 4
weatherometer
ASTM D751 2/ 8/
Flex stiffness, inch-
lbs. x 10-4 at 70oF
ASTM-D-1388 3/ 4/
9.0
-
Warp
7
-
Filling
Flex stiffness, inch-
Lbs x 10-4 at -20oF
ASTM-D-1388 3/ 5/
25
-
Warp
25
-
Filling
4
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business