FED-STD-791D
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 Isopropyl alcohol, reagent grade [1,3,0].
5.3 Petroleum ether, 30 to 60C boiling range, reagent grade [1,4,0].
6. PROCEDURE
6.1 Sampling
6.1.1 The sample must be representative of the material to be tested. When samples
represent packaged quart containers, the entire contents must be filtered. When samples
represent packaged 8-oz containers, the entire contents of at least two, but no more than four, of
the 8-oz containers must be filtered. When the material is packaged in containers larger than 1
qt, a representative 1 L (1 qt) sample must be taken in a clean container for the filtration test.
The entire contents of these samples must be filtered.
6.2 Preparation of apparatus and containers.
6.2.1 Wash all components of the filtering apparatus with hot water and detergent.
6.2.2 Rinse with hot tap water.
6.2.3 Rinse with distilled water.
6.2.4 Rinse with filtered isopropyl alcohol.
6.2.5 Rinse with filtered petroleum ether.
6.2.6 Place clean plastic wrap or aluminum foil over the filtering apparatus when not in
use.
6.3 Preparation of reagents.
6.3.1 Filter the isopropyl alcohol and petroleum ether through a 0.45-m membrane
filter. Discard the first 50 mL of each solvent filtered. Filtering equipment and storage
containers for the solvents must be cleaned as described in 6.2.
NOTE: Ground the filter mechanism to prevent build-up of static electricity.
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