Photosensitized Materiels (Film and Paper) and Flash Bulbs.

TM 38-400/NAVSUP PUB 572/AFMAN 23-210 MCO 4450.14/DLAM 4145.12

impractical to apply preservatives to all types and parts

b. Photo tubes. Strong light levels and high

of electronic equipment, control of RH in storage areas

temperatures contribute to the deterioration of photo

is desirable for long-term storage. Fluctuating humidity

tubes. Photo tubes must be stored out of the direct light

and temperature causes condensation within the

and away from high temperature areas such as heaters,

equipment, which results in rust.

By the use of

etc.

dehumidified storage space, the life expectancy of the

c. Crystals. Crystals, when in storage, will not be

equipment is increased considerably and additional

stored adjacent to electrical wiring. Protection can be

preservation is reduced to a minimum. CH storage

afforded, if necessary, by storing each crystal in a metal

space is particularly desirable in areas having high

container or wrapping each crystal in metal foil.

humidity and where long-term storage is intended.

d. Magnetrons, klystrons, traveling-wave tubes,

Electronic materiel stored in dehumidified warehouses

backward-wave oscillators (carcinatron). These items

ordinarily will not require additional preservation. In

must be stored away from magnetic fields which may be

dehumidified storage, open-framework packing cases

generated by adjacent equipment or wires. Interaction

can be used to provide complete ventilation.

of magnets must also be avoided; therefore, these items

(4) Assembly of complete units. To facilitate

must never be stored bare or without an inner and outer

stock control, issue, and inventory, complete equipment

container.

will be stored as a unit. This is recommended also for

e. Tubes. Tubes will be stored in racks or bins

the storage of complete sets of spare parts. In some

with sufficient shelving to prevent crushing. Tubes will

instances, wave guides, antennas, and hoist

be stored in original cartons if possible. Special storage

mechanisms are too bulky to be stored with other

instructions on the outside of the tube shipping

components, but will be conveniently located so that

containers will be complied with as appropriate. When

such items will not be overlooked when the equipment is

moving tubes, sufficient protective shock absorbing

assembled for issue.

materiel will be used to prevent damage.

(5) Stock issue. Electronic materiel should

(1) Large glass tubes will be stored with

be stored in issuable condition and in such a manner to

extreme care to ensure maximum safety of personnel as

allow issue of older material first, to the extent

well as for maximum tube protection.

practicable. An effective method is to position new

(2) When storing tubes with fins, care must

receipts and stocks being rewarehoused in a fashion to

be exercised to prevent fm damage. If fins are crooked

permit ready access to older materiel by stock selection

or bent, attempts to realign them may affect tube

personnel.

Storage managers should periodically

properties.

monitor stock issue procedures to ensure compliance at

(3) Shipping guards or dust covers are

the warehouse level.

commonly used to protect critical or fragile elements

from damage. These protective items must remain in

5-22.

Photosensitized Materiels (Film and

place during storage.

Paper) and Flash Bulbs.

f. Other electronic materiel.

a. Sensitized

materiels.

Unexposed

(1) Storage. Electronic equipment and bulk

photosensitized materiels are perishable and deteriorate

boxes of maintenance repair parts and components will

with age. Improper storage results in loss of emulsion

be palletized wherever practicable. Components can be

sensitivity, increased fog, inferior tone reproduction, and

stored on frame pallets, depending on the quantity, size,

other defects that may render the materiel useless. The

and shape of components to be stored. Long, heavy

presence in the storage area of heat, moisture, X-rays,

boxes of items such as wave guides and antennas

radioactive material, atomic fission radiation, and

should be kept in racks, preferably on rollers.

certain gases accelerate deterioration.

Careless

handling damages the package and ruins the contents.

(2) Temperature control.

Because the

Assets and consumption reporting on a quarterly basis,

precision components of electronic equipment are

rapid turnover, and careful handling will maximize the

susceptible to corrosion, mold, and fungus growth,

usage of this commodity.

temperature control is desirable in all warehouses where

this materiel is stored. A dry warehouse is essential. At

b. RH control. The required RH for sensitized

certain activities, temperature variance is so slight that

materiels ranges from 30 to 60 percent with 50 percent

mechanical controls need not be installed. A good

considered as ideal. A constant RH will be maintained.

temperature for the storage of electronic materiel is 70

c. Temperature control. Photosensitized materiels

will be stored at temperatures of 50 . or

(3) Humidity control.

Because it is

5-71