FED-STD-791D
4.4 Bath constant - temperature, capable of maintaining the sample 0.5C
(1F) of the specified temperature.
A liquid medium bath is not to be used over 135C (275F). Above
NOTE 2:
135C (275F) use an aluminum block. The heaters should be placed on
the sides of the aluminum block. Base heaters are to be avoided. A
satisfactory heater arrangement is described in method 350 of this
standard. Unless otherwise specified the bath temperature is 121C
(250F) for all oils except spindle oils where it is 100C (212F).
4.5 Assembly fixture, wood (slotted to hold metal squares for tying with cord, as
shown in Figure 1).
4.6 Balance, sensitivity 0.1 mg.
4.7 Microscope, 20 diameter magnification.
4.8 Air-supply, clean, dry, low-pressure, 3-5 0.5 L/hr.
4.9 Forceps, stainless-steel.
4.10 Brush, short-bristled, stiff (typewriter cleaning brush, or equal).
5. MATERIALS
5.1 CAUTION: SOME MATERIALS ARE TOXIC AND HAZARDOUS. The
chemical materials listed in this section must be handled carefully. Federal Test Method
10000, Material Handling Safety Precautions, is a reference which lists all toxic and
hazardous materials cited in FTMS 791. The synonyms, life hazard, flammability,
handling and storage precautions, emergency treatment and measures, and spill practices
of each chemical are explained.
5.2 Metal squares (l each) 0.081 cm (0.032 in) thick by 2.5 cm (l in) square, with
and without two drilled holes (Figure l), as follows:
5.2.1 Copper, electrolytic (ASTM B 152/152M).
Steel, carbon, mild (ASTM 1008A/1008M, class l, commercial bright
5.2.2
finish).
5.2.3 Aluminum alloy (ASTM B 209, temper T-3 or T-4).
5.2.4 Magnesium alloy (SAE AMS 4375, 4376, 4377)
5.2.5 Anodes, Cadmium (A-A-51126B).
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