TO 35-1-3 - Robins Air Force Base
TO 35-1-3 - Robins Air Force Base
TO 35-1-3 - Robins Air Force Base
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<strong>TO</strong> <strong>35</strong>-1-3<br />
• Gas Tungsten-Arc (TIG). When fillers are<br />
required, use Type 410 with 0.08% Max C or W<br />
414 Ti. Helium shielding is preferred over argon<br />
shielding.<br />
6.4.3.3 Do not coat the AISI 409 with any of the zinc-rich<br />
paints. The zinc in the paints can embrittle the stainless under<br />
certain conditions. The use of AISI 409 that is in contact with<br />
zinc-rich painted carbon steel (as in the Hot Section) is acceptable.<br />
6.5 SEALING.<br />
Mating surfaces where moisture could enter from the top or<br />
horizontal will be sealed with sealant MIL-PRF-81733 (cold<br />
section) or sealant SAE-AMS-3374, Type I (hot section) after<br />
primer application and before topcoat application.<br />
6.6 PRIMERS.<br />
Respirator with organic vapor cartridges is required<br />
for all painting/priming operations unless Bioenvironmental<br />
Engineer has approved the work place for<br />
no respirator protection.<br />
6.6.1 Organic Zinc-Rich Primers. The primer will be one<br />
of the previously described primers as identified in Chapter 3.<br />
6.6.1.1 Dry film thickness should be 3.0 mils and approximately<br />
5.0 mils wet.<br />
6.6.1.2 Prior to repainting the exhaust area (or initiating a<br />
contract for repaint) it is important to know the surface temperature<br />
of the exterior walls of the exhaust section. Approximate<br />
temperatures can be obtained with the use of Wahl<br />
Temp-Plate, Wahl Instruments, Inc., Culver City, California<br />
(800) 421-2853, or equivalent. If the temperature is below<br />
300 °F this area shall be coated with Cold Section finishes.<br />
6.6.2 MIL-PRF-23236, Type I, Class 3. MIL-PRF-23236,<br />
Type I, Class 3 is an inorganic zinc-rich primer that is usually<br />
furnished as two or three components.<br />
6.6.2.1 Follow the manufacturers' instructions for mixing,<br />
thinning, and application.<br />
6.6.2.2 Only those products listed on QPD-23236 are authorized.<br />
6.6.2.3 During application of MIL-PRF-23236 primer, the<br />
product should be constantly agitated to prevent the zinc dust<br />
from settling.<br />
6.6.3 Heat Resistant Primer Briner 2905. Instructions for<br />
applying Briner 2905 are as follows:<br />
NOTE<br />
Briner 4765 or Briner 2905 shall be used as a primer<br />
for Briner 2986.<br />
6.6.3.1 Briner 2905 is two component, silver, heat resistant<br />
silicone coating. The zinc powder must be mixed into the SE<br />
before using.<br />
6.6.3.2 Thinning should not be necessary, but the coating can<br />
be thinned with Briner 70 Silicone Reducer to facilitate spray<br />
painting.<br />
6.6.3.3 Apply Briner 2905 by conventional spray. De Vilbiss<br />
MBC-510 Gun, 704 <strong>Air</strong> cap with E needle and Tip or, the<br />
equivalent in Binks.<br />
6.6.3.4 Drying time is one hour (dust free), but will require<br />
400 °F temperature before it cures completely. Curing with<br />
topcoat applied can be accomplished by normal operation of<br />
the suppressor.<br />
6.6.3.5 Apply one coat with a dry film thickness of 2.5 mils.<br />
A dry film of 2.5 mils will require a 5.0 mil wet film thickness.<br />
6.6.3.6 Briner coatings are available from:<br />
Briner Paint Mfg. Company<br />
3713 Agnes Street<br />
Corpus Christi, TX 78405<br />
(512) 884-4804<br />
6.6.4 Heat Resistant Silicone Coating - Briner 2986.<br />
Instructions for applying Briner 2986 are as follows:<br />
NOTE<br />
Briner 2986 shall be used only as a topcoat for Briner<br />
2905 or Briner 4765.<br />
6.6.4.1 Briner 2986 is a one component, black, heat resistant<br />
silicone coating. The material is ready mixed, but should be<br />
thoroughly stirred before use.<br />
6.6.4.2 Thinning can be accomplished using Briner 70 Silicone<br />
Reducer.<br />
6.6.4.3 Apply Briner 2986 by brush, conventional spray, or<br />
airless spray.<br />
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