TO 35-1-3 - Robins Air Force Base

TO 35-1-3
• Gas Tungsten-Arc (TIG). When fillers are
required, use Type 410 with 0.08% Max C or W
414 Ti. Helium shielding is preferred over argon
shielding.
6.4.3.3 Do not coat the AISI 409 with any of the zinc-rich
paints. The zinc in the paints can embrittle the stainless under
certain conditions. The use of AISI 409 that is in contact with
zinc-rich painted carbon steel (as in the Hot Section) is acceptable.
6.5 SEALING.
Mating surfaces where moisture could enter from the top or
horizontal will be sealed with sealant MIL-PRF-81733 (cold
section) or sealant SAE-AMS-3374, Type I (hot section) after
primer application and before topcoat application.
6.6 PRIMERS.
Respirator with organic vapor cartridges is required
for all painting/priming operations unless Bioenvironmental
Engineer has approved the work place for
no respirator protection.
6.6.1 Organic Zinc-Rich Primers. The primer will be one
of the previously described primers as identified in Chapter 3.
6.6.1.1 Dry film thickness should be 3.0 mils and approximately
5.0 mils wet.
6.6.1.2 Prior to repainting the exhaust area (or initiating a
contract for repaint) it is important to know the surface temperature
of the exterior walls of the exhaust section. Approximate
temperatures can be obtained with the use of Wahl
Temp-Plate, Wahl Instruments, Inc., Culver City, California
(800) 421-2853, or equivalent. If the temperature is below
300 °F this area shall be coated with Cold Section finishes.
6.6.2 MIL-PRF-23236, Type I, Class 3. MIL-PRF-23236,
Type I, Class 3 is an inorganic zinc-rich primer that is usually
furnished as two or three components.
6.6.2.1 Follow the manufacturers' instructions for mixing,
thinning, and application.
6.6.2.2 Only those products listed on QPD-23236 are authorized.
6.6.2.3 During application of MIL-PRF-23236 primer, the
product should be constantly agitated to prevent the zinc dust
from settling.
6.6.3 Heat Resistant Primer Briner 2905. Instructions for
applying Briner 2905 are as follows:
NOTE
Briner 4765 or Briner 2905 shall be used as a primer
for Briner 2986.
6.6.3.1 Briner 2905 is two component, silver, heat resistant
silicone coating. The zinc powder must be mixed into the SE
before using.
6.6.3.2 Thinning should not be necessary, but the coating can
be thinned with Briner 70 Silicone Reducer to facilitate spray
painting.
6.6.3.3 Apply Briner 2905 by conventional spray. De Vilbiss
MBC-510 Gun, 704 Air cap with E needle and Tip or, the
equivalent in Binks.
6.6.3.4 Drying time is one hour (dust free), but will require
400 °F temperature before it cures completely. Curing with
topcoat applied can be accomplished by normal operation of
the suppressor.
6.6.3.5 Apply one coat with a dry film thickness of 2.5 mils.
A dry film of 2.5 mils will require a 5.0 mil wet film thickness.
6.6.3.6 Briner coatings are available from:
Briner Paint Mfg. Company
3713 Agnes Street
Corpus Christi, TX 78405
(512) 884-4804
6.6.4 Heat Resistant Silicone Coating - Briner 2986.
Instructions for applying Briner 2986 are as follows:
NOTE
Briner 2986 shall be used only as a topcoat for Briner
2905 or Briner 4765.
6.6.4.1 Briner 2986 is a one component, black, heat resistant
silicone coating. The material is ready mixed, but should be
thoroughly stirred before use.
6.6.4.2 Thinning can be accomplished using Briner 70 Silicone
Reducer.
6.6.4.3 Apply Briner 2986 by brush, conventional spray, or
airless spray.
6-2 Change 8