3.1.1 Before alumination.
Based on the selective sedimentation test
described in paragraph 4.5.1(a), the phosphorus shall contain a maximum
of 3 percent of particles of less than 10 microns diameter.
3.1.2 After alumination.
When tested in accordance with 4.5.1(b), the
powder shall pass through the following sieves:
Thru U. S. Standard Sieve No.
Sieves shall conform to RR-S-366.
Based on the Norma-Hoffman oxidation bomb test described
in 4.5.2, the phosphorus shall show the following oxidation characteristics.
3.2.1 Induction Period.
The minimum induction period shall be 20 hours.
The maximum decrease in pressure per hour for a
3.2.2 Oxidation rate.
5 gram sample shall be 1.4 psi for the automatic recording method and 1.6
psi for visual method.
When tested in accordance with 4.5.3, the
3.3 Copper and iron.
maximum content of either copper or iron shall be 50 parts per million.
The product of the copper content and iron content. each expressed in
parts per million, shall not exceed 125.
When tested in accordance with 4.5.6, the total
3.4 Total phosphorus.
phosphorus content shall be a minimum of 93 percent.