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NAVORD OSTD 52
(TWENTIETH REVISION)
PAINTING OF NAVAL ORDNANCE
EQUIPMENT
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7 JULY 1955
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DEPARTMENT OF THE
NAVYBUREAU OF ORDNANCE
WASHINGTON 25, D. C.
7 July 1955
ORDNANCE STANDARD 52 (TWENTIETH REVISION)
PAINTING OF NAVAL ORDNANCE EQUIPMENT
1. NAVORD OSTD 52 (Twentieth Revision) covers materials, methods, and processesapproved for use in the painting of various types of Naval Ordnance Equipment.
2. This publication is intended for use as a general guide in identifying the designations ofpainting materials and processes shown on drawings and other documents. When so used,
reference must be made to the particular paint systems and processes described herein.
3. This publication supersedes all previous editions of NAVORD OSTD 52, which should be
destroyed.
F. S. WITHINGTON
PAUL D. STROOP
Rear Admiral, U. S. Navy
Deputy Chief,
Bureau of Ordnance
352704-55
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ivCONTENTS
Paragraph Page
1. SCOPE 1
2. USE OF THIS STANDARD 1
3. SURFACES NOT TO BE PAINTED 1
4. MATERIALS AND PROCESSES 1
4.1 Cleaning Materials and Processes 1
4.2 Chemical Treatments and "Pretreatments" 2
4.3 Primers, Fillers, and Sealers 2
4.4 Paints (Enamels, Paints, Lacquers, and Varnishes) 2
4.4.1 Enamels and Paints 2
4.4.2 Lacquers 3
4.4.3 Varnishes and Shellacs 3
4.4.4 Miscellaneous 3
5. PREPARATION FOR PAINTING 3
5.1 General 3
5.2 Cleaning 3
5.2.1 Ferrous Metals 3
5.2.1.1 Pickling 4
5.2.1.2 Special Cleaning of Interior Surfaces 4
5.2.2 Non-ferrous Metals 4
5.2.3 Flux Removal 4
5.3 Surface Treatments 4
5.3.1 General 4
5.3.2 Ferrous Metals 4
5.3.3 Non-ferrous Metals 4
5.3.3.1 Aluminum and Aluminum Alloys 4
5.3.3.2 Magnesium Alloys 4
5.3.3.3 Cadmium-Plated Surfaces 4
5.3.3.4 Zinc Alloys and Zinc-coated Steel 5
5.3.3.5 Copper Alloys 5
6. BUREAU OF ORDNANCE PAINT SYSTEMS 5
7. SELECTION OF PAINT SYSTEMS 8
7.1 Shipboard Equipment 8
7.1.1 Exposed Surfaces 8
7.1.2 Unexposed Surfaces 8
7.2 Underwater Equipment 8
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8. PAINTING AND SEALING DETAILS 8
8.1 Atmospheric Conditions 8
8.2 Conditions of Surfaces 88.3 Paint Thicknesses 9
8.4 Water Seals and Drainage 9
8.5 Paying Surfaces 9
8.5.1 Wood 9
8.5.2 Similar and Dissimilar Metals 9
8.5.3 Treatment of Paying Surfaces 9
8.6 Electric Cables 9
8.7 Workmanship 10
8.8 Painting Instructions 10
11. SCOPE.-This standard covers materials,
methods, and processes approved for use in
the painting of various types of Naval
ordnance equipment. The term "painting" is
understood to include such preparatory
treatments as cleaning, descaling, rustremoval, chemical treatment, filling, calking,
etc., and the subsequent application ofcoatings such as pretreatments, primers, and
final coats of paint, enamel, varnish, or other
protective films.
Painting of certain ammunition items such asprojectiles and containers, rockets, andbombs, is not covered herein. For these
items, reference should be made to the
appropriate publications or drawings,
including the following NAVORD
specifications:
NAVORDOS 1427-
Marking, Painting, andGreasing of Projectiles.
NAVORD
OS 3378-
Painting and Marking of
Rocket Heads and Motors by
the Manufacturer of Inert Parts.
NAVORD
OS 3405-
Painting and Marking of 3"
Caliber and Larger Gun
Ammunition and Ammunition
should be given when particular processes,
materials, and paint systems are to be used.
3. SURFACES NOT TO BE PAINTED.-
Certain types of surfaces do not requirepainting, or are harmfully affected by
painting. These include the following, which
should not be painted or otherwise surfacetreated:
a. Machined surfaces that are required to
move with respect to one another, such asthreads, slides, bearing contacts, gear teeth,
etc. Such surfaces generally are lubricatedwhen in use, but may be protected by readily
removable preservatives when stored.
b. Electrical parts already assembled, such as
contacts, relays, bearings, insulators, etc.When any of these parts are to be painted, the
coating shall be done prior to assembly.
When "touch-up" is required, as on machined
plastics, the utmost care must be used to
avoid any paint residue on surfaces in
electrical contact, or whose proper operation
may in any way be affected by such residue.
c. Parts of copper or copper alloy, plated or
unplated, such as electrical sockets, plugs,
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Components by LoadingActivities.
NAVORDOS 3410- Painting and Marking of GunAmmunition Boxes and Tanks
by Loading Activities.
NAVORD
OS 3571-
Painting and Marking of
Rocket Heads and Motors by
Loading Activities.
NAVORD
OS 6427-
Painting and Marking of Jato
Units and Guided Missile
Boosters and Sustainers.
2. USE OF THIS STANDARD.-This
Standard is intended for use as a generalguide to the selection of suitable painting
materials, systems, and procedures. Indesignating these on drawings or in
specifications or other documents, reference
to NAVORD OSTD 52 as a whole should befor general procedures only, e. g.,
preparation. Specific references in
accordance with this standard
connectors, contacts, and terminals. Plastic
and rubber insulators, mounts, spacers, etc.,used in connection with these items, also
shall not be painted, except where "touch-up"on cut ends of plastics is desirable.
d. Lubrication fittings, cups, etc., should not
be painted, but adjacent piping or equipment
may be color coded for identification.
4. MATERIALS AND PROCESSES.-The
following is a list of approved specification
materials and processes, classified by types,
that are commonly used for surface
preparation and painting of ordnancematerial. This list does not include all of thematerials which may, under proper
conditions and with prior Bureau of
Ordnance approval, be used.
In all cases, the latest issue of a specification
is to be used.
4.1 Cleaning Materials and Processes:
FEDERAL
O-P-
191-
Perchlorethylene
(Tetrachlorethylene), Technical
Grade.
O-T-634-
Trichlorethylene, Technical Grade.
2
FEDERAL-ContinuedP-S-611-
Solvent, Dry Cleaning.
TT-R-
251-
Remover, Paint and Varnish
(Organic-Solvent Type).
MILITARY
MIL-C-490-Cleaning and Preparation of
Ferrous and Zinc-Coated Surface for Organic
Protective coatings. (Grade II-Cleaning
Treatments.) MIL-M-7752(Aer)-Metal
MIL-S-974-
Surfacer, Sanding.
MIL-P-
2829-
Packing Material, Joint-Sealing,
(Oil and Water Stop).
MIL-P-
6889-
Primer, Zinc Chromate, For
Aircraft Use.
MIL-C-
15202-
Cement, Smoothing (Formula No.
62).
MIL-C-
15705-
Calking Compound (Liquid
Polymer Polysulfide Synthetic
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Cleaner, Silicate Soap.
NAVORD
OS
1158-
Cleaning and Protecting Interior
Non-machined Surfaces of Castings
and Fabrications.
4.2 Chemical Treatments and"Pretreatments":
FEDERAL
QQ-
P-416-
Plating, Cadmium
(Electrodeposited).-Types II and IIISupplementary Treatments.
QQ-
Z-
325-
Zinc Plating (Electrodeposited).
Types II and III Supplementary
Treatments.MILITARY
MIL-C-
490-
Cleaning and Preparation of
Ferrous and Zinc-Coated MetalSurfaces for Organic Protective
Coatings. (Grade I-Phosphating).
MIL-F-495-
Finishes, Chemical, Black forCopper Alloys.
MIL-M-
3171-
Magnesium Alloy; Processes for
Corrosion Protection of.
MIL-C-5541-
Chemical Films for Aluminum andAluminum Alloys.
MIL-A-8625-
Anodic Coatings for Aluminumand Aluminum Alloys.
MIL-C-
15328-
Coating, Pretreatment (Formula
No. 117 for Metals).
4.3 Primers, Fillers, and Sealers:
TT-P-25-
Primer, Paint, Exterior (Undercoatfor Wood (Ready-Mixed, White and
Tints.
TT-F-336-
Filler, Wood, Paste.
TT-P-636-
Primer Coating, Synthetic, Woodand Ferrous Metal.
TT-P-
664-
Primer, Coating, Synthetic, Rust
Inhibiting, Lacquer-Resisting.
Rubber, Formula No. 112, ForMetal Enclosures).
MIL-P-15930- Primer, Paint, Vinyl-ZincChromate Type, Formula No. 120.
MIL-C-
16231-
Calking Compound (For Metal
Seams).
4.4 Paints (Paints, Enamels, Lacquers, and
Varnishes):
4.4.1 ENAMELS AND PAINTS.-(Thedistinction between paints and enamels is no
longer distinct. Enamels are paints which
contain more or less synthetic or naturalresin, as well as drying oils and solid
pigments.)
FEDERAL
TT-E-485-
Enamel (for) Drums and Other MetalProducts, Rust-Inhibiting, Olive
Drab.
TT-A-
489-
Enamel, Gloss, Synthetic (For
Exterior and Interior Surfaces).
TT-A-
468-
Aluminum-Pigment; Powder and
Paste for Paint. Used with Varnish
MIL-V-1174.)
MILITARY
JAN-L-
73-
Lacquer-Enamel, Lustreless. MIL-
E-74-Enamel, Lustreless, Quick-
Drying.
JAN-P-
450-
Paint, Acid-Proof, Black (For
Ammunition).JAN-E-
480-
Enamel, Baking, Phenol-or Urea
Formaldehyde.
JAN-P-
702-
Paint, Inside, White, Semi-Gloss,
Fire-Retardant.
MIL-E-
1115-
Enamel, White (Formula, 30) (For
Naval Shipboard Use).
MIL-P-
1264-
Paint, Outside, White (Formula No.
6).
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MIL-P-1265-
Paint, Outside, Ocean Gray, No. 17(Formula No. 5-0).
MIL-E-5556- Enamel, Camouflage, Quickdrying.
3MILITARY-Continued
MIL-E-
10687-
Enamel, Lusterless, Quickdrying
(For Ammunition).
MIL-E-
15090-
Enamel, Equipment, Light-Gray
(Formula No. 111) (For Naval
Shipboard Use).
MIL-P-
15130-
Paint, Outside, Haze-Gray, No.
27 (Formula No. 511).
MIL-P-
15932-
Paint, Outside, Gloss-Black,
(Vinyl-Alkyd) (Formula No. 122-1.
MIL-P-
15933-
Paint, Outside, Dull-Black
(Vinyl-Alkyd) (Formula No. 122-
3).
MIL-P-
16189-
Paint, Anti-Fouling, Vinyl, Black
(Formula No. 219).
MIL-E-16663-
(BuOrd)
Enamel, SemiGloss (For MetalSurfaces of Ammunition and
Ammunition Containers).
MIL-P-
16738-
Paint, Outside, White, Vinyl-
Alkyd (Formula No. 122-82).
MIL-P-
20087-
Paint, Heat Resisting.
4.4.2 LACQUERS.-(Solutions of resins such
as cellulose compounds in a solvent, with or
without pigments. "Drying" depends only onevaporation of solvent.)
FEDERAL
TT-L-31- Lacquer, Cellulose Nitrate, Gloss.
MILITARY
MIL-L-6805-Lacquer, Camouflage.
4.4.4 MISCELLANEOUS.-The following are
often referred to in connection with painting,
prevention of deterioration, test methods, andrelated matters:
NAVORD OS
6341-
Miscellaneous General
Ordnance Requirements.
FEDERALSTANDARD
595-
Colors for Paints.
TT-P-141- Paint, Varnish, Lacquer,
and Related Materials;
Methods of Inspection,
Sampling, and Testing.
MIL-C-15159- Compound, Preservative,
Fire-, Water-, Mildew-, and
Weather-Resistant (For
Canvas).
5. PREPARATION FOR PAINTING
5.1 General.-Before the application of anypaint (including primers and pretreatments)
surfaces shall be thoroughly clean, dry, and
free of oil, grease, dirt, old paint, rust, and
mill scale. Surfaces of wood shall be sanded
clean and smooth.
5.2 Cleaning:
5.2.1 FERROUS METALS.-Ferrous metalsurfaces shall be cleaned by one or more of
the methods of Grade II, Specification MIL-
C-490. Mechanical cleaning should be used
only on items where contamination from the
cleaning process will not affect criticalsurfaces or adjacent parts. Where necessary,
old paint shall be removed by use of solvent
type paint remover, Specification TT-R-251.
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4.4.3 VARNISHES AND SHELLACS.-(Varnishes are solutions of resins and dryingoils in solvents. Shellacs are solutions or
dispersions of certain resin in alcohol.)
FEDERAL
TT-V-51- Varnish, Asphalt.
TT-V-91- Varnish, Shellac.
TT-V-121- Varnish, Spar, Water-Resisting.
MILITARY
MIL-
V-173-
Varnish, Moisture and Fungus-
Resistant, for the Treatment of
Communications, Electronic, andAssociated Electrical Equipment.
MIL-
V-
1137-
Varnish, Electrical-Insulating (For
Electromotive Equipment).
MIL-
V-
1174-
Varnish, Spar, Water-Resisting
(Formula No. 80).
All cleaning shall be followed by thorough
rinsing to remove residue from solvents,acids, or other chemicals. Details of cleaning
and subsequent treatment shall comply withthe requirements given in Specification MIL-
C-490.
5.2.1.1 Pickling.-When authorized by the
drawing or specification of the item being
processed, acid pickling may be used to
remove mill-scale and rust from surfaces tobe painted. The pickling bath shall consist of
a 5-percent by volume solution of sulfuric
acid (5 gallons of 66 Baume sulfuric acid to
95 gallons of water) maintained at 170-180degrees F, and inhibited with type B
(nonfoaming), Class A (liquid) picklinginhibitor, Specification O-1-501, used in
accordance with the manufacturer'sdirections. After removal of scale asindicated by a uniform
4gray color, the item shall be allowed to drainbefore rinsing. The pickling bath shall be
discarded when the iron content reaches 5
percent. The rinsing bath shall consist of
fresh circulating water maintained at 170-180
degrees F. Combined concentrations of
sulphuric acid and iron sulphates in the rinse
shall not exceed 2.0 grams per gallon. Thehot water rinse shall be followed byimmersion in a rust-inhibiting solution
containing one ounce per gallon of sodium
dichromate and 3/4 oz/gal of phosphoric acid,
75-percent grade. This solution shall be
maintained at 190 to 205 degrees F, and
immersion shall be for two to five minutes.
Concentrations shall be maintained properly
so that the steel removed from the bath has aclean appearance. Surfaces shall be allowed
may remain. The final rinse should always bewith hot water, followed by thorough drying.
5.3 Surface Treatments:
5.3.1 GENERAL.-Practically all metalsurfaces require some type of chemical
treatment prior to priming, to secure the bestpossible adhesion of paints (including primer
coats) and also the best resistance to
deteriorating influences. The recommended
treatments for various metals are given in the
following subparagraphs:
5.3.2 FERROUS METALS.-Surfaces of
ferrous metals shall be cleaned in accordance
with paragraph 5.2.1. Surfaces which are to
be painted shall, unless otherwise specified,
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to dry thoroughly and shall be prime-coated
as soon as possible thereafter.
5.2.1.2 Special Cleaning of Interior
Surfaces.-Interior surfaces of castings and
fabrications which are to contain working
parts, such as bearings, gears, shafts, etc., or
hydraulic fluids, shall be cleaned in
accordance with NAVORD OS 1158 to
remove all possible sources of contamination.
5.2.2 NON-FERROUS METALS.-Cleaning
of non-ferrous metals shall be by means of
solvents such as Specification P-S-661, Paint
Remover, Specification TT-R-251, or bydetergents or cleaners which do not harm thesurface, such as metal cleaner, Specification
MIL-M-7752(Aer), followed by thorough
removal of residues, rinsing, and drying.Strong alkaline cleaners shall not be used on
surfaces of aluminum and its alloys, zinc
alloys, or zinc coatings. Use of sand-blast,
steel wool, or acids for cleaning of non-
ferrous metals, ordinarily will not be
permitted. However, under properly
controlled conditions, certain chemicaltreatments are permissible for preparing
surfaces for painting (see 5.3), and stainless-
steel wool may be used on aluminum alloys.
5.2.3 FLUX REMOVAL.-Fluxes used in
oining metal of any type shall be removed
thoroughly prior to painting. In most cases,
thorough cleaning with hot water issufficient. Rosin residues may be removed
with alcohol. Fluxes containing greasy matter
should be cleansed with dry cleaning solvent."Neutralization" of acidic residues is not
recommended, since salt residues
be phosphated in accordance with
Specification MIL-C-490, Grade I. When, forsome reason, this treatment is impractical (as
on very large surfaces) pretreatment coatingin accordance with Specification MIL-C-
15328 may be used.
5.3.3 NON-FERROUS METALS.
5.3.3.1Aluminum and Aluminum Alloys.-Surfaces of aluminum or its alloys shall be
anodized where required, in accordance with
Specification MIL-A-8625. Chemical
treatment, in accordance with Specification
MIL-C-5541, may be used as a basis forpainting.
5.3.3.2Magnesium Alloys.-Surfaces of
magnesium alloy, when permitted, shall be
treated in accordance with Specification
MIL-M-3171.
5.3.3.3 Cadmium-Plated Surfaces.-Surfaces
of cadmium-plated articles which are to bepainted shall be treated in accordance with
one of the supplementary treatments (Type IIor Type III) of Specification QQ-P-416, or
with pretreatment coating, Specification
MIL-C-15328. Unpainted cadmium-plated
surfaces shall be given a supplementarytreatment, Specification QQ-P416, Type II.
5.3.3.4Zinc Alloys or Zinc-Coated Steel.-
Surf aces of zinc alloys or coatings which are
to be painted shall be treated in accordance
with one of the supplementary treatments
(Types II and III) of Specification QQ-Z-325.Surfaces not so treated during manufacture
shall be given a pretreatment withSpecification MIL-C-15328 material.
Unpainted zinc-plated surfaces shall be given
a supplementary treatment, Specification
QQ-Z-325, Type II.
5
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5.3.3.5 Copper Alloys.-When required,
surfaces of copper alloys may be given ablack chemical treatment in accordance with
Specification MIL-F-495. This type of finishneed not be painted, but can serve as a base
for paint.
6. BUREAU OF ORDNANCE PAINT
SYSTEMS.-Certain paint systems (formerly
referred to as paint numbers) have become
established as standard for Naval Ordnanceuse. A paint system is a series of paints
including primers, when used, and finish
coats, and may consist of several coats. The
"systems" are in addition to any cleaning,preparation, and pretreatments required (see
paragraph 5). In table 1, the currentlyapproved paint systems are shown, together
with the most frequent uses of the systems
listed (see Index to table 1). Systems which
have been discontinued, or replaced byothers, are shown in table 2.
The systems and colors indicated in table 1,
although approved as "standard", are not to
be considered mandatory in all cases. It is
expected that those responsible will exercise
good judgment in determining when
exceptions may be necessary, in accordance
with current knowledge, policies, or unusualsituations.
Colors of paints shall be in accordance with
the requirements of the specification for thepaint itself, for the color indicated. Colorchips are available from the sources indicated
in the individual specifications.
INDEX TO PAINT SYSTEMS IN TABLE 1
Equipment, Type of
Surface or Exposure
System No.
Acid resistant surface 5
Armored cable 25
Background (Name
plates, cases)
17
Cable, armored 25
Cases, instrument,
background
17
Cases, instrument, interiorsurfaces
13 or 27
Cases, metal 25
Cases, mine, exteriorsurfaces
46
Cases, mine, interior
surfaces
13
Crates, mine 46 or 46A
Depth Charges 2
Electrical parts, sealing or
touch-up
42
Equipment in storage or 2
Equipment, Type of Surface
or Exposure
System No.
Mines-Continued
Cases See Nos.13, 46
Crates 46 or 46A
Exterior surfaces 46 or 48
Floats 48
Interior surfaces 13
Moored 48
Surfaces in contact with
explosives
47
Mounts, gun See Nos.22, 25
Name plates 17
Non-metallic surfaces exposed
to weather
22
Optical Instruments:
Cases 13 or 17
Exterior surfaces 37 or 37A
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protected
Equipment not exposed to
weather
37
Flight gear, mines 46
Gun-mount enclosures,
interior surfaces
25
Instrument cases, interiorsurfaces
13, 27, or 30
Instruments, portable 37A
Launchers 10
Metal surfaces exposed to
weather
22
Metal surfaces, high
reflectance
14
Mines See Nos. 13, 46,
46A, 47, 48
Anchors 46A
Bottom and drifting 46
Interior surfaces 7
Knobs, eye pieces 9
Racks, instrument, mine 46
Sealing or touch-up, electrical
parts
42
Surfaces in contact with
explosives
47
Wood:
Accessories 33 or 36
Boxes not exposed to weather 33
Boxes exposed to weather 12
Interior of wooden cases 30
Natural finish 31 or 32
6
Table 1. PAINT SYSTEMS
SystemNo.
Name Primer, Filler,Surfacer
1
Final Paint Coats and
ColorUses
Paint and Color No. of
Coats
2 Ocean gray MIL-P-6889 orTT-P-664.
MIL-P-1265-ocean gray
1 Exterior surfaces ofequipment in storage or
within shields or turrets;
depth charges.
5 Acid-
resisting
black
None BuShips
Formula 27
2 Acid-resistant coating.
7 Dull black
enamel
MIL-P-6889 MIL-E-5556,
dull black No.604.
1 Inside non-bearing
surfaces of opticalinstruments, for
minimum reflectance.
9 Semi-gloss
black
enamel.
MIL-A-6889 MIL-E-5556,
dull black No.
604.
1 Knobs, eye-pieces, etc.,
of optical instruments.
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MIL-E-16663
(BuOrd), black.
1
10 Heat-resistant
paint
None MIL-P-20087 2 Launchers, etc., wheretemperatures are high.
12 Ocean gray
for wood
TT-P-468, Type
II, Class B-1 1/2lb. to 1 gal.
varnish, MIL-V-
1174.
MIL-P-1265-
ocean gray
2 Wooden boxes exposed
to weather. (For metal,use System No. 2.)
13 Semi-gloss
white
MIL-P-6889 JAN-P-702-
white
2 Interior surfaces of mine
cases (except where incontact with
explosives), and
instrument cases.
14 Gloss white MIL-P-6889 or
TT-P-664.
JAN-P-702-
white
1 Metal surfaces not
exposed to weather, forhigh light reflectance.MIL-E-1115-
white
1
17 Flat blacklacquer
MIL-P-6889 MIL-L-6805,black No. 604.
2 ormore
Background on nameplates, cases, etc.
22 Haze gray2
MIL-P-6889 or
TT-P-664 (onmetals only).
MIL-P-15130-
haze gray
2 Metal surfaces exposed
to weather; non-metallicsurfaces exposed to
weather (omit primer).
25 Aluminum
paint for
metal.
MIL-P-6889 or
TT-P-664.
TT-A-468, Type
II, Class B-2 lb.
to 1 gal. varnish,
MIL-V-1174.
2 Interior of gun-mount
enclosures; metal cases;
armored cable.
7
27 White gloss
lacquer
MIL-P-6889 TT-L-31, white 3 or
more
Inside of instrument
cases, for maximum
light.
30 Aluminum
paint for
wood.
None TT-A-468, Type
II, Class B-1 1/2
lb. to 1 gal.
varnish, MIL-V-
1174.
1 Interior of wooden
instrument cases.
31 Varnish for
wood
TT-F-336 filler TT-V-121
varnish
2 Natural wood finish,
e.g.,for hardwood boxes.
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32 Varnish,
rubbed
TT-F-336 filler TT-V-121
varnish
2 Natural wood finish,
rubbed and polished.
33 Orangeshellac
None TT-V-91, TypeII-4 1/2 lb. per
gal. alcohol.
1 or 2 Wooden boxes andaccessories.
36 Bleached
shellac
TT-F-336 filler TT-V-91, Type
1-4 lb. per gal.alcohol.
2 Wooden accessories.
37 Light gray
enamel,
semi-gloss.
MIL-P-6889, and
MIL-S-974 if
required for
smoothing.
MIL-E-15090,
Class 2-light
gray.
2 Equipment not exposed
to weather.
37A Light grayenamel-gloss.
MIL-P-6889, andMIL-S-974 if
required for
smoothing.
MIL-E-15090,Class 1-light
gray;
2 Portable instruments.
42 Electrical
insulating
varnish.
None MIL-V-173 or
MIL-V- 1137
varnish.
1 Sealing or touch-up on
electrical parts.
46 Olive drab MIL-P-6889 MIL-E-10687,Olive drab.
2 Exterior surfaces ofbottom and drifting
mines, mine cases, crates,flight-gear, instrument
racks, etc.
46A Black,
lustreless
MIL-P-6889 MIL-E-10687,
black
2 Mine anchors and crates.
47 Acid-proof
black
None JAN-P-450-
black
1 Interior surfaces of
mines, etc., in contact
with explosives.
48 Anti-foulingpaint.
MIL-C-15328(one coat).
MIL-P-16189-dark
2 ormore to
4 mil
min.
Exterior surfaces ofmoored mines and floats.
MIL-P-15930
(four coats to 4mil. min.
thickness).
---- MIL-P-16738-
white
---- Marking mines.3
1One coat each, except where otherwise noted.
2System No. 22 replaces the former ocean gray for exposed surfaces on shipboard.
3 Items coated with this system shall be marked "COATED WITH VINYL ANTI-FOULING
SYSTEM".
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8
Table 2
DISCONTINUED OR REPLACED
PAINT NUMBERS
Paint
Number
Discontinued, or Replaced by
System Number
1 2
3 2
4 See paragraph 8.5.3.6 Discontinued.
81
9 (black) or 37 (gray).
11 Specification TT-P-25 primer for
wood.
15 17
16 17
18 Primer MIL-P-6889 or TT-P-664.
19 See paragraph 1 for painting
ammunition.20 17
21 22
23 No. 2 for metals, No. 12 for wood.
24 25
26 25
28 22 or 37 (See table 1).
29 37
34 36
35 36
38 Primer, Specification TT-P-25.
39 Use system 46A or 48, as
applicable.
40 See paragraph 1 for painting
ammunition.
41 MIL-C-15159 preservative for
canvas, gray.
7.1 Shipboard Equipment:
7.1.1 EXPOSED SURFACES.-In general,
fixed equipment exposed to view from sea or
air is finished haze gray (system No. 22),
although it may be shipped or stored with
system No. 2 applied.
Obviously, it is not necessary to repeat the
primer coat when additional coats are applied
after installation. Previous procedures in
which ocean gray was used for exposedsurfaces are now superseded.
7.1.2 UNEXPOSED SURFACES.-Surfaces
of shipboard equipment not normally
exposed to view from sea or air are painted in
accordance with the type of equipment or
parts, their location, or their function. The
various uses indicated in table 1 should be
referred to for selection of suitable paint
systems.
7.2 Underwater Equipmentk.-Equipment
such as mines, which may be in continuous
contact with water, require different types of
paint from those used for shipboardequipment. Systems 46, 46A, and 48 are
applicable.
8. PAINTING AND SEALING
DETAILS.-In this section, various detailed
procedures in connection with painting are
considered, such as atmospheric conditions,paint thicknesses, sealing against water entry,
drainage, faying surfaces, and welded orsoldered surfaces.
8.1 Atmospheric Conditions.-Painting
should preferably be done when airtemperatures are between 60 and 90 degrees
F., and when the relative humidity is not over
65 percent. It is realized that such conditions
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43 See paragraph 8.6.
44 See paragraph 8.6.
45 See paragraph 8.6.
1Use of shrivel or wrinkle enamel on new
work has been discontinued because ofdifficulty in removing radiological
contamination.
7. SELECTION OF PAINT SYSTEMS.-In
general, paint systems for ordnanceequipment should be selected in accordance
with table 1, which lists uses for the various
systems. It should be noted that manyparticular items of equipment may have more
than one paint system. This is especially true
as regards the external and internal surfaces
of equipment.
are not always obtainable. In no case should
painting be done in windy weather (becauseof the possibility of dust deposits), or when
the temperature is below 40 degrees F. or therelative humidity exceeds 85 percent.
8.2 Conditions of Surfaces.-Thorough
surface cleaning and preparation is a
prerequisite for acceptable painting. The
procedures shall consist of complete removal
of rust and mill scale; solvent removal of oiland grease; removal of all dust and dirt; and
thorough drying. Welding and soldering
should preferably not be done after painting;
but if any welding or soldering is done, allsurfaces within the heat-affected zone shall
be cleaned, reprimed, and repainted.Similarly, when
9painted surfaces have been marred orabraded, or show rust, the affected areas shall
be recleaned, reprimed, and repainted in thesame manner as the original surfaces.
8.3 Paint Thicknesses.-Although it is
desirable to prevent build-up of heavy paint
coats, certain minimum thicknesses arerecognized as desirable for best protection.
Primers and paints shall normally be used as
supplied, in accordance with specifications,
or thinned only as specified.
Thicknesses of the dry coatings shall be as
follows:
Primers-0.5 to 0.8 mil per coat. (Not
applicable to pretreatment coating, MIL-C-
15328.)
Paints, enamels, varnishes, and lacquers-0.8to 1.2 mil per coat.
Sprayed finishes shall be built-up to the same
8.5.2 SIMILAR AND DISSIMILARMETALS.- Each of the following groups of
metals is considered to contain similarmetals. Corrosion due to electrolytic action is
least likely when the metals are in the same
group. Unless properly insulated from each
other, metals from different groups should
not be placed in contact. The metals referred
to are those on the surface, e.g., zinc platingor coating.
Group 1-Magnesium and its alloys.
Group 2-Cadmium, zinc, and aluminum, and
their alloys.
Group 3-Iron, steel, lead, tin, and their alloys
(except "Stainless" steel).
Group 4-Copper, chromium, nickel, silver,
gold, platinum, titanium, cobalt, and theiralloys; stainless steel.
8.5.3 TREATMENT OF FAYING
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thicknesses as required for brush or dip coats.
8.4 Water Seals and Drainage.-Sinceconsiderable damage may be done by the
retention of water, particularly salt water, in
cavities, cracks, recesses, etc., it is of the
utmost importance to guard against such
damage by proper design, and by the use of
sealing materials where necessary. Drainage
holes should be provided wherever horizontal
surfaces might retain water. Irregularities insurfaces which prevent free drainage may be
smoothed by the application of as many coats
as necessary of Specification MIL-S-974
surfacer over the priming coat, and sandingsmooth. Rough or pitted surfaces, seams,
oints at faying surfaces, etc., may be filledwith Cement, Smoothing, Specification MIL-
C-15202, after priming. Bases of metalenclosures generally are sealed with calkingcompound, Specification MIL-C-15705.
8.5 Faying Surfaces.-Surfaces of metals in
close contact are termed faying surfaces.
When such surfaces move with respect to
each other, they usually are lubricated andrequire no other protection. Treatment of
laying surfaces which are fixed relative to
each other depends on whether the metals are
similar or not. In some cases, metal surfaces
are in contact with wood, and thereforerequire special protection because of the
tendency of wood to retain water.
8.5.1 Wood.-Wood in contact with metal
shall be given two coats of varnish,
Specification MIL-V-1174. The metal shallbe given two coats of primer, MIL-P-6889.
SURFACES.-All laying surfaces of metals,
whether similar or dissimilar, shall have atleast two coats of primer, MIL-P-6889,
applied to each surface. Each coat shall dryhard before the next coat is applied. When
the metals are dissimilar, extra protection
may be obtained by the extra insulation
provided by the use of a zinc chromate
impregnated sheet or tape, Specification
MIL-P-2829. After the surfaces are joined, it
is equally important that moisture be kept out
by using additional coats of paint and, wherenecessary, sealing or calking materials (see
paragraphs 4.3 and 8.4). In the case of slip
fits or press fits, some protection is affordedby coating with MIL-P-6889, and assembling
while still wet. However, such treatmentcannot take the place of proper sealing and
painting of the adjoining edges.
8.6 Electric Cables:
8.6.1 RUBBER-COVERED.-When
protection of exposed rubber-covered cable is
required, the cable shall be cleaned with dry
cleaning solvent, specification P-S-661. If thesheath or jacket is badly checked or cracked,
repeated applications of electrical insulating
varnish, Specification MIL-V-1137 should be
made by rubbing with a cloth until all cracks
are filled, allowing sufficient time for dryingbetween coats. A brush-coat of the same
varnish shall then be applied. For undamaged
sheaths, only the latter is necessary. This
should be followed by a coat of aluminum
10varnish (table 1, No. 30) and a final coat of
paint to match the surroundings.
8.6.2 ARMORED CABLE.-Metal-armoredcable shall be painted before pulling through
greasy or damp surfaces, or over any foreign
substance. Except where otherwise specified,
coats of primers, sealers, paints, enamels,
etc., shall be allowed to dry hard before thenext coat is applied. Paint coverage shall be
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and strapping, and before assembling the
gland nuts at the stuffing tubes. Paint systemNo. 25 shall be used, followed, if necessary,
by a final coat of paint to match thesurroundings.
8.7 Workmanship.-Preparation for painting
and application of paints shall be in
accordance with good standards of
workmanship. Every precaution shall be
taken that surfaces are thoroughly cleanedand prepared. Paint shall not be applied over
uniform and unbroken.
8.8 Painting Instructions.-Any specialinstructions regarding application of paints,
place of painting, intervals between coats,
etc., shall be included in the contract or other
documents applicable to the equipment. In
some cases, for instance, an item may receive
some of the paint coats during manufacture at
one location, and additional coats after the
item is shipped or installed.
DISTRIBUTION
SNDL Part 2 (No. 25)Two copies each unless otherwise excepted:
A3; A5 (BUAER, BUORD, BUSHIPS); B1, B5; E1, E2; F1, F2, F3; K; L; M16, M17; P; R1,
R10.
Requests for additional copies of OSTD 52 (20th Revision) should be submitted to theSuperintendent, U. S. Naval Gun Factory, Washington 25, D. C.
20 July 1955/3M/1