A-A-1197A
Rubbing efficiency.
Rubbing block. The rubbing surface of the block shall be 4 inches long by 3 inches wide and designed so that a strip of flannel may be securely clamped to and stretched taut over the block in order to completely cover the bottom rubbing area. Provision shall be made for the attachment of lead weights to the top of the block in an evenly apportioned manner to give total weights of 8 and 15 pounds. The block shall be operated in a level, smooth, reciprocating motion through a length of 2 inches in a direction parallel to the length of the block. The block shall operate at a speed of 4ti strokes per minute, a stroke being considered as one complete cycle from starting position of block and return to starting position.
Panels. Four steel panels 3 inches x 5 inches x 0.125 inch thickness of 1020 steel, one face of which shall be machined flat, shall have the flat face coated with one coat of primer,TT-P-664, and two coats of olive drab automotive lacquer conforming to test lacquer in Table I, so that the total dry film thickness is 1.5 to 1.7 mil after air drying for 10 days the panels shall be washed vigorously with a mild soap solution, rinsed, and dried thoroughly and weighed to t-he nearest milligram.
TABLE I. Test lacquer
|
Ingredient |
Percent by weight |
|
Yellow dispersion (1) |
8.0 |
|
Orange dispersion (2) |
8.0 |
|
White dispersion (3) |
2.0 |
|
Black dispersion (4) |
6.0 |
|
Nitrocellulose RS 1/2 second (65% in ethanol) |
7.0 |
|
Non-drying phthalic alkyd resin (5) (65% in xylol) |
12.5 |
|
Blown castor oil (6) |
1.6 |
|
Dioctyl phthalate |
1.6 |
|
Ethyl acetate |
6.6 |
|
Butyl acetate |
13.3 |
|
Ethyl alcohol |
4.3 |
|
Butyl alcohol |
7.7 |
|
Toluol |
21.4 |
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business