FED-STD-791 Lubricants, Liquid Fuels, And Related Products, Testing Method OfThis test method standard is composed of standard test methods for sampling, inspecting and testing lubricants, liquid fuels and related products. It is issued pursuant to the Federal Property and Administration Services Act of 1949, as amended and its application to the purchase of commodities referred to herein is mandatory on all Federal agencies.

Pages 1 - - 309 - 310 - 311 - 312 - 313 - 314 - 315 - 316 - 317 - 318 - 319 - 320 - 321 - 322 - 323 - 324 - 325 - 326 - 327|||

'�NOTE:This draft dated 15 April 2006' by DasH - Page 318 of 460

FED-STD-791D

5.5 Test panels, FS 1009 steel, fabricated from open-hearth, "killed" type low

carbon, No. 4 soft-temper, cold-rolled sheet or strip conforming to QQ-S-698.

Dimensions of the panels shall conform to Appendix I of ASTM D 1748. Cold drawn

bar stock is not satisfactory.

5.6 Surgical gauze.

6. PROCEDURE

6.1 Clean the steel panels as follows:

a. Round the edges and ream out the suspension holes in accordance with

Appendix I of ASTM D 1748.

b. Wipe the surfaces with solvent soaked rags and scrub with surgical swabs in a

beaker of hot naphtha.

NOTE 1:

Caution. Naphtha is flammable. Use only in a well ventilated area. Keep

all flames away from the naphtha.

c. Rinse in a beaker of hot methyl alcohol.

NOTE 2:

Caution. Methyl alcohol is both toxic and flammable. Use only in a well

ventilated area. Do not allow it to come in contact with the skin or breathe

its fumes. Keep all flames away from methanol.

d. Cool the panels in a desiccator until further processing.

e. Test panels must be handled with a panel hook at all times, avoiding contact

with any type of contaminated surface.

f. Maintain the solvents at a temperature high enough to keep the temperature of

the panels above the dew point during the cleaning operation.

6.2 Sandblast the panels as follows:

a. Sandblast the edges and lightly sandblast the back of the panels with silica sand.

b. Sandblast the unnumbered side, or test surface, of the panels to a fresh,

uniformly abraded surface.

c. Immediately after sandblasting, place the panels in a beaker of anhydrous

methanol.

d. Heat the methyl alcohol so that the solvent will evaporate from the panels

immediately upon withdrawal from the solvent.

e. Remove remaining residue by holding the panels in a rack at 20� from the

vertical and spraying downward with naphtha.

f. Spray the test surface, then the back of the panel and the test surface again.

g. Rinse the panels in hot naphtha and hot methyl alcohol and store in a desiccator

until cool.

h. Panels are to be used the same day as prepared.

317