painting of naval ornance equipment 1955

8/3/2019 Painting of Naval Ornance Equipment 1955

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NAVORD OSTD 52

(TWENTIETH REVISION)

PAINTING OF NAVAL ORDNANCE

EQUIPMENT


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7 JULY 1955

This page is blank

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.



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

painting of naval ornance equipment 1955

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