F-F-351F
3.5.4 Additive removal. Type I, class 3 filters; type II, filter elements; and type IV filter
elements shall be tested for additive removal. The lubricating oil used in testing shall retain not less
than 90 percent (%) of its original additive content (see 4.6.4).
3.5.5 Filtering ability (see 4.6.5).
3.5.5.1 Types I and II. Applicable filters and elements shall be tested for filtering ability
as specified in 4.6.5. For type I, class 1 and 3 filters, the normal pentane insoluble content of the
oil samples taken at the end of the test shall be not greater than 0.50% by weight. The cumulative
filtering efficiency at the end of 22, 44, 66 and 88 hours of operation, as applicable, shall be not
less than 85%.
3.5.5.2 Type IV filter elements. Elements shall be tested for filtering ability as specified in
4.6.5. Differential pressure of class 1, 2 and 4 filter elements shall not exceed 3 psi (21 kPa)
initially, nor exceed 12 psi (83 kPa) before completion of the 66 hours of testing. Differential
pressure of the class 3 element shall not exceed 1 psi (7 kPa) initially, nor exceed 12 psi before
completion of the 66 hours of testing. The normal pentane insoluble content of the oil samples
shall not be greater than as specified in table II.
TABLE II. Content in percentage by weight.
Class
22 hrs.
44 hrs.
66 hrs.
1
0.120
0.240
0.272
2
0.120
0.240
0.272
3
0.188
0.376
0.456
4
0.087
0.174
0.202
3.5.6 Shock resistance. (see 4.6.6).
3.5.6.1 Types I and II, class 3. Type I, class 3 filters and type II, class 3 filter elements
shall show no evidence of mechanical or other damage after being subjected to the shock test as
specified in 4.6.6.1 through 4.6.6.6. Flow rates at the end of the test shall be not less than 90%
nor more than 110% of their original flow rates.
3.5.6.2 Type IV elements. Elements shall meet the filtering ability requirements of 3.5.5
after being subjected to the shock test specified in 4.6.6.7.
3.5.7 End-load strength. Type IV filter elements shall withstand end loads as specified in
table III without evidence of permanent deformation or other visible damage (see 4.6.7).
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