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TO 1-1-700 - Robins Air Force Base

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<strong>TO</strong> 1-1-<strong>700</strong><br />

inactivity, storage, or shipment is known as non-operational<br />

preservation.<br />

7.5.4 Types of CPCs. CPCs can be separated into two<br />

major categories: water displacing and non-water displacing<br />

compounds.<br />

7.5.4.1 Water Displacing Compounds. Water displacing<br />

CPCs can be used to remove water, including sea water, or<br />

other electrolytes from metal surfaces. MIL-PRF-81309, MIL-<br />

PRF-63460, MIL-PRF-16173, Grade 3, and MIL-PRF-32033<br />

are water displacing CPCs that are able to penetrate into<br />

cracks, crevices, voids at faying surface edges, around fastener<br />

heads, and into hinges. They usually provide very thin coatings,<br />

one mil (0.001 inch) or less in thickness, they are clear or<br />

translucent and remain soft and oily after application, so they<br />

cannot provide long term protection outdoors or in areas<br />

which are frequently handled.<br />

7.5.4.1.1 Water Displacing, Hard Film. Another type,<br />

MIL-DTL-85054, differs from the other water displacing compounds<br />

as it doesn't penetrate into joints very well but forms a<br />

relatively hard, dry film on exterior surfaces; and therefore, it<br />

can be used for protection outdoors and in areas of frequent<br />

handling.<br />

7.5.4.2 Non-Water Displacing Compounds. Non-water<br />

displacing CPCs may be used on dried surfaces or on wet<br />

surfaces which have been first treated with a water displacing<br />

CPC. MIL-PRF-16173, Grades 1, 2, and 4 are non-water displacing<br />

CPCs. They are heavier bodied waxy type greases<br />

which provide long term corrosion protection by forming a<br />

barrier film on metal surfaces. These CPCs provide thicker<br />

coatings and are light brown to very dark brown in color, with<br />

a waxy greasy appearance. They provide good corrosion protection<br />

and in areas where large amount of water collect on or<br />

run off of structures.<br />

7.5.5 Time Limitations of CPCs. Because of their temporary<br />

nature, CPCs must be regularly removed and replaced to<br />

provide continuing corrosion protection. Table 7-3 provides<br />

the recommended time intervals for indoor and outdoor CPC<br />

use.<br />

Table 7-3. Time Limitations for CPCs<br />

CPC Outdoor 1 Indoor 2 Indoor Covered 3<br />

Soft Thin Films<br />

MIL-PRF-81309, Type II 14 Days 30 Days 180 Days<br />

MIL-PRF-81309, Type III 5 Days 14 Days 90 Days<br />

MIL-L-87177, Grade B 5 Days 14 Days 90 Days<br />

MIL-PRF-16173, Grade 3 14 Days 30 Days 180 Days<br />

Lubrication and Protection<br />

MIL-PRF-32033 5 Days 30 Days 180 Days<br />

MIL-PRF-63460 5 Days 30 Days 180 Days<br />

Hard Thick Films<br />

MIL-DTL-85054 90 Days 210 Days 365 Days<br />

MIL-PRF-16173 Grade 4 90 Days 210 Days 365 Days<br />

MIL-PRF-16173 Grade 2 90 Days 210 Days 365 Days<br />

MIL-PRF-16173 Grade 1 210 Days 365 Days 365 Days<br />

1 Outdoor: Without cover; exposed to elements in a mild climate; absence of rain and other washing forces; free from air<br />

and water borne pollutants.<br />

2 Indoor: Hangars, shop areas, storage or parts accumulation areas, warehouses.<br />

3 Indoor covered: Items are wrapped or sealed in a water-resistant material and stored indoors in a hangar, warehouse, or<br />

shop area. Soft thin film CPCs were designed for indoor use and ease of removal.<br />

7-18

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