Pro Lube meets the military specification: MIL-PRF-32033
Lubricating Oil, General Purpose, Preservative (Water-Displacing, Low Temperature)

MIL-PRF-32033 covers one type and grade of water-displacing, preservative lubricating oil, known hereinafter as "oil", for general purpose applications at low temperatures. The oil can be applied by dipping, brushing, or by spraying from gas-pressurized cans.

The status of MIL-PRF-32033 is active.

This lubricating oil, Pro Lube, is a general purpose, preservative, is intended for lubrication and protecting against corrosion of certain small arms and automatic weapons and whenever a general purpose, water-displacing, low-temperature lubricating oil is required. This oil becomes very viscous at low temperatures so that its use at temperatures below -40°C is limited by a number of machine design factors and should be proved for any specific item application by test before adoption. The availability of this material in gas-pressurized containers will prove to be beneficial for use in areas difficult to preserve by existing procedures. This preservative oil should not be used to protect the fuel system and combustion chamber of engines which are preserved in accordance with standard procedures. This material contains a carboxylic acid which could react with certain metals present in the fuel system, forming soaps which could contribute to fuel filter plugging.

The oils supplied under contract should have the same formulation as when qualified. The finished oil properties should fall within permissible tolerances as listed in table II. However, after the application of tolerances, the values of the properties of the oil should not exceed the maximum nor fall below the minimum requirements specified herein.

MIL-PRF-32033 (ProLube) Kinematic viscosity. The Kinematic viscosity of MIL-PRF-32033 (ProLube)
 

MIL-PRF-32033 (ProLube) Corrosion protection (humidity cabinet):

MIL-PRF-32033 (ProLube) Removability:
The MIL-PRF-32033 (ProLube) oil shall leave no visual evidence of oil residue, stain or discoloration on metals.

MIL-PRF-32033 (ProLube) Water displacement and water stability:
MIL-PRF-32033 (ProLube) oil , after storage in contact with water, shall satisfactorily displace water as evidenced by the absence of rust, mottling, or surface stains on the panels.

MIL-PRF-32033 (ProLube) Corrosiveness (bimetallic couple):
The oil shall protect metal to the extent that no more than a combined total of three corrosion dots, none of which exceed 1 mm in diameter, occur on the discs.

MIL-PRF-32033 (ProLube) Wear:
The oil, MIL-PRF-32033 (ProLube,) shall lubricate the steel balls such that the average scar diameter on the steel balls shall not exceed 1 mm.

MIL-PRF-32033 (ProLube) Copper strip corrosion:
 The oil shall not tarnish the copper strip exceeding the value of 2a on the ASTM Copper Strip Corrosion Standards

MIL-PRF-32033 (ProLube) Corrosiveness and oxidation stability (metal protection):
The oil, MIL-PRF-32033 (ProLube,) shall not produce corrosion or oxidation effects on metal specimens greater than a weight gain or loss of 0.2 milligrams/square centimeter (mg/cm2). The oil shall not pit nor etch the surface of the metal specimens. The oxidized oil shall exhibit no insoluble materials or gum when examined.

MIL-PRF-32033 (ProLube) Viscosity stability:
The viscosity change of the oxidized oil at 40°C shall be not more than a 5 percent (%) decrease or a 20% increase.

MIL-PRF-32033 (ProLube) Neutralization number change:
To determine conformance to 3.4.2.2, after completing the corrosiveness and oxidation stability test (see 4.2.3.2), determine the neutralization number of the oil IAW ASTM D 974. The neutralization number shall not be more than 0.20 higher than the original neutralization number of the oil.

MIL-PRF-32033 Color
To determine conformance to 3.4.3, the oil shall be tested IAW ASTM D 1500, and shall exhibit a color not greater than 7.0.

MIL-PRF-32033 Support and ownership requirements verifications:

MIL-PRF-32033 Solid sediment/precipitation number:
To determine conformance to 3.5.1, the oil shall be tested IAW ASTM D91, and shall not generate more than 0.05 mL mean total volume of sediment.

MIL-PRF-32033 Toxicity:
To determine conformance to 3.5.2, components of the oil’s formulation shall be compared with the toxic limits established by the guidelines of OSHA 29 CFR 1910.1200, the ACGIH Threshold Limit Values and Biological Exposure Indeces, and the most current National Toxicology Program’s Annual report on Carcinogens. Oils with components exceeding the toxic limits shall be disqualified. Methods of quantitative determination shall be selected at the discretion of both the qualifying activity and the manufacture/blender.

MIL-PRF-32033 Product identification:
The oil unit containers shall be examined for the proper product warning/identification.

Fill (gas-pressurized cans only). A can of the oil shall be weighed. The oil shall be sprayed from the can in three-minute periods, followed by one minute pauses, until the can is empty. The can shall then be re-weighed, and the net weight calculated. The calculated net weight shall not be less than 12.5 ounces.

MIL-PRF-32033 (ProLube) Environmental requirements verifications:

Flash point: To determine conformance to 3.6.1, the oil shall be tested IAW ASTM D 92, and shall exhibit a minimum flash point of 135°C.

Pour point: To determine conformance to 3.6.2, the oil shall be tested IAW ASTM D 97, and shall exhibit a maximum pour point of –57°C.

8 MIL-PRF-32033 w/AMENDMENT 2

MIL-PRF-32033 (ProLube) Evaporation loss:
To determine conformance to 3.6.3, the oil shall be tested at 100°C IAW ASTM D 972, and shall exhibit a maximum mass percent evaporation loss of 25%.

MIL-PRF-32033 (ProLube) Low temperature stability:
To determine conformance to 3.6.4, the oil shall be tested at -45°C IAW method 3458 of FED-STD-791, and shall not exhibit any gelling, crystallization, solidification or separation of insoluble material.

MIL-PRF-32033 (ProLube) Film characteristics/high temperature stability:
To determine conformance to 3.6.5, coat a glass panel or a microscope slide with a sample of the oil. Next, drain the panel for 24 hours at an angle of 45° with the horizontal and at a temperature of 25° ± 3°C. Then store the panel in an oven at 100°C for 24 hours. The oil shall not exhibit any gumminess, tackiness or hardness.

MIL-PRF-32033 (ProLube)Qualification:
With respect to products requiring qualification, awards will be made only for products which are, at the time of award of contract, qualified for inclusion in Qualified Products List QPL No. 32033, whether or not such products have actually been so listed by that date. The attention of the contractors is called to these requirements, and manufacturers are urged to arrange to have the products that they propose to offer to the Federal Government tested for qualification in order that they may be eligible to be awarded contracts or purchase orders for the products covered by this specification. Information pertaining to qualification of products may be obtained from: Department of the Army, U.S. RDECOM, F & L Technology Team, ATTN: AMSRD-TAR-D, MS110, Warren, Michigan 48397-5000.

MIL-PRF-32033 (ProLube) Definitions:

MIL-PRF-32033 (ProLube) Film characteristics:
A drying process progresses through three stages identified as gummy, tacky, and hard. These are defined as follows:

1. a. Gummy - First evidence of becoming viscous.
2. b. Tacky - Advanced stage of drying, becoming sticky.
3. c. Hard - A completely dry-to-touch film.

MIL-PRF-32033 (ProLube) International standardization agreement implementation:
This specification implements NATO STANAG 1135 - Interchangeability Of Fuels, Lubricants And Associated Products Used By The Armed Forces Of The North Atlantic Treaty Nations. When amendment, revision, or cancellation of this specification is proposed, the preparing activity must coordinate the action with the U.S. National Point of Contact for the international standardization agreement.

MIL-PRF-32033 (ProLube) Panel preparation for oil in gas-pressurized cans:
Historically, the following procedure has been found to provide the best results for humidity cabinet testing of oil supplied in gas-pressurized cans: Shake a gas-pressurized can of oil vigorously for 30 seconds. Set the cleaned panels at an angle of 15° from vertical. Hold the pressurized can vertically at a distance of 25 to 30 centimeters from the panel. With the valve open, move the can to direct the spray from one edge of the panel to the other. Make sufficient passes to assure a continuous coating. After five minutes examine the coating to determine if it is smooth and unbroken. If the coating shows evidence of gas entrapment, prepare another panel. Drain the panels for 2 hours and submit them to the test specified in ASTM D1748.

MIL-PRF-32033 (ProLube) QPL tolerances:
The oils supplied under contract should have the same formulation as when qualified. The finished oil properties should fall within permissible tolerances as listed in table II. However, after the application of tolerances, the values of the properties of the oil should not exceed the maximum nor fall below the minimum requirements specified herein.

MIL-PRF-32033 (ProLube) Waste disposal instructions:

Please refer to the MSDS for Pro Lube (MIL-PRF-3203)