A-A-55063A
4--Blocking. Cloth surfaces separate with difficulty or coating is removed during
separation.
3/ The 4-1/2 inch diameter test area shall show no leakage. Leakage is defined as the
appearance of water at three different places in the 4-1/2 inch diameter test area.
4/ The hydrostatic head shall be raised to a height of 20 inches for a period of 1 hour and then
examined for leakage.
5/ Extent of leakage shall be not more than 5 milliliters of water.
6/ An area approximately 2 - inches by 8 - inches extended along the center line of the
specimen shall be abraded by means of a 2- inch square of 1/0 garnet paper. The garnet paper
shall be uniformly loaded to 8.0 (± 0.1) ounces. The specimen shall be laid on a smooth level
surface with the heavily coated side up and abraded as described by moving the loaded garnet
paper five times in each direction. The specimen shall be turned over and abraded on the other
side (i.e. The specimen is abraded in a North-south direction on one side and an east-west
direction on the other side). The abraded specimen shall be tested with the abraded area in the
center of the 4-1/2 inch diameter test area. The hydrostatic head shall be raised to a height of
20 - inches for a period of 1 hour. A leakage of more than 5 milliliters of water by the end of
the test period shall be reported as a test failure.
3.2.1.1.1 Coating compound. The coating compound shall be chloroprene rubber or
polyisobutylene rubber suitably compounded plasticized with phthalate or phosphate ester
plasticizers, and pigmented black when tested as specified in ASTM D 297. Natural rubber,
synthetic rubber other than chloroprene rubber, or reclaimed rubber shall not be used.
3.2.1.2 Dusting powder. The dusting powder for application to the coated cloth shall be a
whiting, finely divided non-toxic mineral material of ground potassium aluminum silicate (see
7.5).
3.2.2 Tape/webbing (nylon or polyester). The tape/webbing shall be 3/4 (-1/32, + 1/16) inch
wide, and sufficiently lightweight and flexible for tying when the apron is donned. The fiber
content shall be nylon or polyester when tested in accordance with AATCC 20. The
tape/webbing shall meet the requirements of Table III when tested in accordance with the
methods provided therein. The apron shall have two (2) tapes/webbings for the waist cut to 24
(± 1/2) inches in length, and one (1) tape/webbing cut to 30 (± 1/2) inches for the neck strap.
TABLE III. Tape/webbing performance requirements
Characteristic
Requirement
Test Method
Water Repellency
Dynamic absorption, percent, initial only (maximum)
40
AATCC - 70
pH
5.5 - 8.5
AATCC 81
Labile sulfur
None present
1/
1/ The presence of labile sulfur test method shall be as follows unless otherwise specified in the
contract or solicitation (see 7.6): 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
3
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