COLORFASTNESS TO LAUNDERING OF COTTON AND LINEN
TEXTILE MATERIALS; LAUNDER-OMETER METHOD
10 SCOPE
1.1 This method is intended for determining the colorfastness of cotton and
linen or blends of cotton and linen with other fibers to laundering.
2. TEST SPECIMEN
2.1 Standard sample. Unless otherwise specified in the procurement document,
when a standard sample has been established, the required specimen from each
sample unit of the material to be tested, and one specimen from the standard
sample, shall be as follows:
2.1.1 Cloth. 4 + 0.1 grams of cloth.
2.1.2 Yarn, thread, light cordage, tape, webbing and braid. 4± 0.1 grams of
the applicable material, so held together to form a unit for testing.
2.2 No standard sample. Unless otherwise specified in the procurement
document, when a standard sample has not been established, the required
specimens from the sample unit of the material to be tested shall be as
specified in 2.1.1 or 2.1.2. One additional specimen shall be taken from
sample unit of the material to be tested and shall be retained, untested,
comparison. All specimens shall be taken from adjacent areas of the sample
unit.
each
for
3. NUMBER OF DETERMINATIONS
3.1 Unless otherwise specified in the procurement document, one specimen per
color shall be tested from each sample unit.
4. APPARATUS, REAGENTS, AND METHOD CITED
4.1 Apparatus.
4.1.1 Launder-Ometer. A Launder-Ometer or similar machine having a metal
adapter in which tightly capped stainless steel cylindrical containers 5 inches
(127 mm) in length by 3 inches (76 mm) in diameter are held with their bases
toward a horizontal shaft 2 inches (51 mm) from the center of rotation. The
shaft shall rotate at 40 to 45 rpm. Each container shall be equipped with a
FED. TEST METHOD STD. NO. 191A