1、 MIL-PRF-7870D 30 April 2010 SUPERSEDING MIL-PRF-7870C 17 February 1998 PERFORMANCE SPECIFICATION LUBRICATING OIL: GENERAL PURPOSE, LOW TEMPERATURE (NATO O-142) AMSC N/A FSC 9150 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. METRIC Comments, suggestions, or questi
2、ons on this document should be addressed to HQ AFPET/PTPT, 2430 C Street, Bldg 70, Area B, Wright-Patterson AFB OH 45433-7632 or e-mailed to AFPET.AFTTwpafb.af.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database
3、at https:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-7870D 2 This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers one grad
4、e of general purpose, low temperature lubricating oil. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additi
5、onal information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government docum
6、ents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFE
7、NSE SPECIFICATIONS MIL-PRF-680 Degreasing Solvent FEDERAL SPECIFICATIONS QQ-S-698 Steel Sheet and Strip, Low Carbon (Copies of these documents are available from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia PA 19111-5094 or online at https:/assist.daps.dla.m
8、il or https:/assist.daps.dla.mil/quicksearch.) 2.3 Non-Government publications. The following documents form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of the documents are those cited in the solicitation or contract. ASTM INTERNATIONAL ASTM A
9、108 Standard Specification for Steel Bar, Carbon and Alloy, Cold-Finished (DoD Adopted) ASTM A304 Standard Specification for Steel Bars, Alloy, Subject to EndQuench Hardenability Requirements (DoD Adopted) ASTM A322 Standard Specification for Steel Bars, Alloy, Standard Grades (DoD Adopted) ASTM B36
10、/B36M Standard Specification for Brass Plate, Sheet, Strip, and Rolled Bar (DoD Adopted) ASTM D91 Standard Test Method for Precipitation Number of Lubricating Oils (DoD Adopted) ASTM D92 Standard Test Method for Flash and Fire Points by Cleveland Open Cup Tester ( DoD Adopted) Provided by IHSNot for
11、 ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-7870D 3 ASTM D97 Standard Test Method for Pour Point of Petroleum Products (DoD Adopted) ASTM D445 Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)
12、 (DoD Adopted) ASTM D972 Standard Test Method for Evaporation Loss of Lubricating Greases and Oils (DoD Adopted) ASTM D974 Standard Test Method for Acid and Base Number by Color-Indicator Titration (DoD Adopted) ASTM D1500 Standard Test Method for ASTM Color of Petroleum Products (ASTM Color Scale)
13、(DoD Adopted) ASTM D1748 Standard Test Method for Rust Protection by Metal Preservatives in the DoD Adopted) ASTM D4057 Standard Practice for Manual Sampling of Petroleum and Petroleum Products (DoD Adopted) ASTM D4636 Standard Test Method for Corrosiveness and Oxidation Stability of Hydraulic Oils,
14、 Aircraft Turbine Engine Lubricants, and Other Highly Refined Oils (DoD Adopted) (Copies of these documents are available online at http:/www.astm.org or the ASTM International, 100 Barr Harbor Drive, West Conshohocken PA 19428-2959) 2.4 Order of precedence. Unless otherwise noted herein or in the c
15、ontract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Qualific
16、ation. The instrument oil furnished under this specification shall be a product that is authorized by the qualifying activity for listing on the applicable Qualified Products List (QPL) before contract award (see 4.2.1 and 6.3). Changes shall not be permitted in the formulation of an approved produc
17、t unless specific written approval of the qualifying activity is obtained. 3.2 Materials. The oil shall be formulated to meet the requirements of this specification, and containing additive materials to impart corrosion-protective and oxidationresistant properties. 3.3 Properties. The properties of
18、the finished oil shall be as specified in table I when tested as specified in section 4. TABLE I. Properties of the finished oil. Characteristics Value Minimum Maximum Viscosity mm/s2at 38 C 10 at -40 C 4000 Pour point -57 C Flash point 130 C Precipitation number (mL) 0 Acid number (mg KOH/g) report
19、 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-7870D 4 3.4.1 Corrosion and oxidation stability. When tested as specified in section 4, the change in weight of cadmium-plated steel, copper, steel, aluminum alloy, and magnesium alloy, subject
20、ed to the action of the oil for 168 hours at 121 C 1 C, shall not be greater than 0.2 mg per cm of surface for each strip. There shall be no pitting, etching, or visible corrosion on the surface of any of the metals when viewed under magnification of 20 diameters. Slight discoloration of the surface
21、 of the copper will be permitted, but dark brown, gray, or black stain shall be cause for rejection. 3.4.2 Resistance to oxidation. When tested as specified in section 4, the oil shall not have changed more than -5 to 20 percent from the original viscosity in mm/s2 at 38 C after the oxidation-corros
22、ion test (see 4.4.2). The neutralization number increase shall not be greater than 0.2 mg KOH/g after oxidation. There shall be no evidence of separation of insoluble materials or gumming of the oil. 3.4.3 Low temperature stability. When tested as specified in section 4, there shall be no gelling or
23、 separation of solid or liquid phases in the oil after storage at a temperature at or below 54 C for 72 hours. The presence of a dense cloud, which does not “settle out,” shall not be the cause for rejection. 3.4.4 Evaporation. When tested as specified in section 4, there shall be not more than 25 p
24、ercent by weight evaporation loss after the oil has been subjected to the test conditions, at 100 C. 3.4.5 Corrosivity. When subjected to the test specified in section 4, the test areas of the three discs shall show no evidence of corrosion, pitting, or other attack. The third disc may show no more
25、than three spots within the area covered by the clip. 3.5 Color and appearance. When tested as specified in section 4, the oil shall be clear, transparent, uniform in appearance, and not darker than No. 5 Union Colorimeter of ASTM D1500. 3.6 Protection of panels. When tested as specified in section
26、4, not more than one panel out of five panels shall fail after being covered with a film of lubricating oil for 100 hours. If more than one panel fails, the product shall be retested by repeating the same test with an additional ten panels. Not more than four panels shall fail out of the total 15 pa
27、nels, (five on the original test, ten on retest). 3.7 Workmanship. The oil shall be entirely homogeneous and free from lumps of un-dissolved additive, water, dirt, lint, or sediment. Prior to final packaging the oil shall be filtered through a 5.0 micrometer pore-size filter. 4. VERIFICATION 4.1 Cla
28、ssification of inspections. The inspection requirements specified herein are classified as follows: a. Qualification inspection (see 4.2). b. Quality conformance inspection (see 4.3). 4.2 Qualification inspection. Qualification inspection shall consist of a review for approval of the submitted manuf
29、acturers test report and subjecting the qualification samples (see 4.2.1) to examination and testing for all the requirements of this specification. 4.2.1 Qualification samples. The qualification sample(s) shall consist of 1 gallon finished oil, and if requested by the qualifying activity, a 1 pint
30、base stock (before the additive agents) and 1 ounce of compounds used for improving the oxidation stability and corrosion protection. In the event that the additives are supplied as concentrated solutions, an equivalent quantity of the solution shall be furnished. 4.2.2 Qualification tests. Qualific
31、ation sample(s) shall be subjected to all tests specified in 4.4, method of inspection. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-7870D 5 4.2.3 Retention of qualification. In order to retain qualification of a product approved for listi
32、ng on the QPL, the manufacturer shall verify by certification to the qualifying activity that the manufacturers product complies with the requirements of this specification. The time of periodic verification by certification shall be in 2.5-year intervals from the date of original qualification. The
33、 Government reserves the right to re-examine the qualified product whenever deemed necessary to determine that the product continues to meet any or all of the specification requirements. 4.3 Quality conformance inspection. Quality conformance tests shall be as specified in table II. Samples shall be
34、 labeled completely with information identifying the purposes of the sample, name of product, specification number, lot and batch number (see 6.5), date of sampling, and contract number. TABLE II. Quality conformance tests. Inspection Paragraph Requirement Test Corrosion and oxidation stability 3.4.
35、1, 3.4.2 4.4.2 Low temperature stability 3.4.3 4.4.4 Viscosity 3.3 4.4.2 Pour point 3.3 4.4.2 Flash point 3.3 4.4.2 Precipitation number 3.3 4.4.2 Evaporation 3.4.4 4.4.2 4.4 Method of inspection 4.4.1 Inspection. Refer to the contract clauses or purchase order for specific inspection requirements.
36、4.4.2 Test methods. The oil properties shall be determined in accordance with the applicable methods specified in table III and 4.4.3 through 4.4.5. Physical and chemical values specified in section 3 apply to the arithmetic average of the determinations made on the samples for those values that fal
37、l within any stated repeatability or reproducibility limits of the applicable test method. 4.4.3 Protection test. 4.4.3.1 Preparation of panels. The following procedures shall be conducted: a. Cut five panels from steel that conforms to QQ-S-698. b. Size the panels and locate the holes as shown in f
38、igure A1.7 of ASTM D1748. Remove all burrs, sharp edges, and corners, including the edges of the holes. c. Highly polish the panel with No. 3/0 emery paper prior to use. Next wash and clean the panel in a solvent conforming to MIL-PRF-680, Type II. Then drain thoroughly and agitate in boiling 95 per
39、cent methanol. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-7870D 6 d. After cleansing, cool the panels in a desiccator. Care must be taken during cleaning and preparation to ensure that the surfaces are not contaminated by fingerprints. H
40、andle the panels only with tongs during the cleaning operation and only with hooks during and after dipping. TABLE III. Test methods for oil properties. Characteristics ASTM Test methods Corrosion and oxidation stability D4636 1Pour point D97 Flash point (open cup method) D92 Precipitation number D9
41、1 Viscosity D445 Color D1500 Evaporation loss of lubricating greases and oils D972 Acid number D974 Note 1 Test shall be run for 168 hours at 121 C. Use hexane, heptane, and/or acetone to clean coupons. Use Alternate Procedure 2. 4.4.3.2 Procedure. These steps shall be conducted: a. Dip five panels
42、in a suitable sample of lubricating oil, which is maintained at 25 C 2 C, remove and allow to drain for 2 hours at that temperature from glass, Monel, or stainless steel supports. b. At the end of this period, suspend the panels in a humidity cabinet conforming to ASTM D1748 for a period of 100 hour
43、s, and in such a manner that the condensate from the supports will not fall onto the panels. Maintain the humidity within the cabinet at 100 percent relative humidity and at a dry bulb temperature of 49 C 2 C for a 100-hour exposure period. c. Remove the panels from the cabinet, clean them with naph
44、tha, and examine. Panels have failed the protection test if at the end of the test period one of the following conditions exists in the significant areas of the panels as defined by ASTM D1748, figure A1.8, considering both sides of the panel: (1) A corroded area of 2mm diameter or larger (2) Two or
45、 more spots of between 1 mm and 2 mm maximum diameter. If more than one panel in five panels fail the protection test as defined above, a retest will be permitted. Retests shall consist of repeating the protection test using ten additional panels. Reject the lubricating oil if more than four panels
46、fail the test (adding failures of both test and retest). 4.4.4 Stability at low temperature. A 100-ml sample of the oil shall be maintained at or below 54 C for 72 hours in a stoppered flask. At the end of that time there shall be no visual evidence of gelling, separation, or crystallization of the
47、oil. Presence of a dense cloud, which does not “settle out,” shall not be cause for rejection. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-7870D 7 4.4.5 Corrosivity test 4.4.5.1 Preparation of panels (also see 4.4.3.1) 4.4.5.2 Preparation
48、 of steel disc. The following steps shall be performed: a. Cut three discs 0.5 inch thick from a 1inch diameter bar stock that conforms to ASTM A108, ASTM A304, and ASTM A322, composition FS E52100. b. Heattreat the discs to a hardness of Rockwell C-62. (Rollers that may be obtained from rollerbeari
49、ngs with similar chemical, physical, and dimensional properties to the above bar stock after heat treatment, can be substituted for the formation of the discs. In this case, no additional heat treatment is necessary.) c. Now, slowly surface grind on one side to a finish of less than 20 micro-inches rms. If coolant is used during grinding, slush the discs in absolute methanol.
