MIL-L-23398D

Abstract

This specification establishes the requirements for two types of air-cured solid film lubricant (identified by NATO code number S-749) (see <a>6.5</a>) intended to reduce wear and prevent seizing, corrosion and galling (see <a>6.1</a>). The lubricant can be applied by dipping, brushing or spraying. <b><u>Intended Use:</u></b> This air cured solid film lubricant is intended for use on steel, titanium or aluminum bearing surfaces where moderate wear life and corrosion protection are desired. It is useful where conventional lubricants are difficult to apply or retain or where other lubricants may be contaminated with dirt and dust. It is generally suitable for sliding motion applications such as in plain spherical bearings, flap tracks, hinges and cam surfaces, especially where it is not feasible to use the type of solid film lubricant which requires baking at an elevated temperature. This material, although intended for air dry application may be heat cured at temperatures up to 120&#176;C (248&#176;F). Use of manganese or zinc phosphate pretreatment on steel bearing surfaces will enhance the wear life and corrosion protection provided by this lubricant, which can be used to prevent scoring and seizure on initial start up of new or heavily loaded equipment. The use of this lubricant is not recommended on roller bearing elements or in conjunction with oils or greases unless field use indicates otherwise. This lubricant can be expected to provide corrosion protection for five years in indoor storage and approximately two years protection in outdoor storage when lubricant is applied over phosphated steel to a thickness of 0.0005 inch. Where maximum corrosion protection on steel is desired, the lubricant should be applied over phosphated steel to a thickness of 0.001 inch. The heavier coating can be expected to provide outdoor corrosion protection for approximately four years. <br>