Click here to make tpub.com your Home Page

Page Title: Nonvolatile gum residue
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home

   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 




img
MIL-T-6396E
NOTE:
Diffusion expressed in fluid ounces per square foot per 24 hours equal
the gram loss of the test specimen per 24 hours multiplied by a factor
which is defined as:
Where sp. gr. = specific gravity of test fluid at 77F (25C).
R = inside radius of test cup expressed in inches.
Alternate test methods may be used if approved by the acquisition activity. A
test apparatus utilizing a grooved mounting flange with mating head in the
retainer ring has been found to yield more consistent results for some
materials.
4.6.13 Fuel contamination
4.6.13.1 Nonvolatile gum residue. A 5-gram sample of the inner layers, up to
the barrier, shall be diced up into approximately 0.062 inch squares and placed
in a flask containing 250 milliliter (ml) of test fluid conforming to TT-S-735,
type III, and allowed to stand for 48 hours at 77F + 5F (25C + 3C). The
contaminated test fluid shall be decanted off and the nonvolatile gum residue
determined by method 3302, FED-STD-791, (ASTM D381-64) except that the total
evaporation time shall be 45 minutes. The nonvolatile material shall not
exceed 60 milligrams (mg) per 100 ml or the contaminated fluid.
4.6.13.2 Stoved gum residue. The beakers containing the nonvolatile material
shall be placed in  0 an appropriate bath maintained constantly at a temperature
0
0
of 572 F + 9F (300 C + 5 C) for 30 minutes. After cooling in a closed
container, the beakers shall be weighed. The stoved gum residue shall not
exceed 20 mg per 100 ml of the contaminated fluid, after necessary corrections
have been made for preformed gums originally present in the test fluid.
4.6.14 Oil dilution resistance. Tensile and elongation tests, before and
after immersion in the oil diluted 30 percent by volume with test fluid
conforming to TT-S-735, type III, shall be made on the inner layer ply in
accordance with FED-STD-601, methods 4111 and 4121, respectively. The test
specimens shall be immersed for 48 hours at room temperature. The tensile
properties shall be reduced no more than 40 percent from the original values
and the shore A durometer hardness shall vary no more than 15 points from the
original value.
4.6.15
Inner liner strength
4.6.15.1 Gum inner liner strength. The tensile strength of the gum inner
layer ply, without barrier, shall be determined in accordance with FED-STD-601,
method 4111, before and after immersion in TT-S-735, type III test fluid for
0
0
72 hours at a temperature of 135 F + 3 F (57C + 2C). The tensile strength
shall also be determined before and after immersion in a solution of 25 percent
MIL-I-27686 inhibitor and 75 percent water, by volume; for 72 hours at a
temperature of 135F + 3F (57C + 2C).  The tensile strength reduction shall be
reported to the contractor or acquisition activity. The strength shall be
reduced no more than 50 percent for fuel immersion and 20 percent for water
immersion calculated on the basis of the original cross-sectional area.
19

Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business