METHOD 4261.1
March 22, 2001
APPEARANCE OF TRANSPARENT LIQUIDS
1. SCOPE
1.1 Scope. This method provides a procedure for determining the appearance of clear materials of
both a drying and nondrying nature. The materials are checked upon decantation, standing 24 hours,
and after agitation.
2. APPARATUS
2.1 Tubes. Gardner bubble tubes made of clear glass with a closed flat, even bottom, a diameter
of 0.43 ± 0.001 inches and an internal length of 4.48 ± 0.002 inches.
2.2 Water bath. A water bath capable of maintaining the specified temperature ± 0.5°C and
equipped with a stirring device.
3. REAGENTS
3.1 Reagents. None required.
4. PROCEDURE
4.1 Preparation. Thoroughly mix the sample. Fill two 6-inch test tubes with the sample to within
1 inch of the top of the test tubes. Stopper the tubes with clean corks.
4.2 Materials other than drying oils. Immediately examine the contents of the tubes by
transmitted light for haze, turbidity, hair, grain, clots, gell bodies, skins, and other insoluble matter
that may be in suspension. Tilt one of the tubes at a small angle from the horizontal so that the air
bubble will move slowly and permit observation in the thin moving film of any fine particles that
might otherwise escape notice. Let the tubes stand undisturbed for 24 hours at 21°C to 32°C and
examine for sediment. Shake one of the tubes vigorously and as soon as the air has escaped from
the liquid compare the appearance of the liquids in the two tubes.
4.3 Drying oils. If the oil is cloudy at room temperature, warm the tubes and their contents in a
water bath to 65°C and hold for 5 minutes. Examine while warm by transmitted light and tilting the
tubes as described in 4.2.
5. PRECISION
5.1 Data. No data.
6. NOTES
6.1 Notes. None.
FED. TEST METHOD STD. 141D
1
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business