1、MIL-G-BL737A 71 m 7777706 OllO7q2 7 t-l-o%-39 MI L-G-81937A 27 December 1984 SUPERSEDING 19 September 1974 MI L-G-81937 MILITARY SPECIFICATION GREASE, INSTRUMENT, ULTRA-CLEAN, METRIC This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Sco
2、pe. This specification covers the requirements for one grade of an ultra-clean instrument grease with characteristics which permit its use from -54C to 121C. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. Unless otherwise specified, the followina sD
3、ecifications. standards. and handbooks of the issue listed in that “a issue of the Department of Defense Index of Specifications and Standards (DoDISS). specified in the solicitation form a part of this specification to the extent specified herein. STAN DARDS FEDERAL FED-STD-209 - Clean Room and Wor
4、k Station Requirements, Controlled FED-STD-313 - . Material Safety Data Sheets, Preparation and Sub- FED-STD-791 - Lubricants, Liquid Fuels and Related Products, Environment. . mission of. Methods of Testing. MI LI TARY MI L-STD- 105 - MI L-STD-290 - Packaging of Petroleum and Related Products. Samp
5、ling Procedures and Tables for Inspection by Attributes. - Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Systems Engineering and Standardization Department (Code 931, Naval Air Engineering Cen
6、ter, Lakehurst, NJ 08733, by using the self-addressed Standardization Document Improve- ment Proposal (DD Form 1426) appearing at the end of this document or by letter. TI Licensed by Information Handling ServicesProvided by IHSNot for ResaleNo reproduction or networking permitted without license fr
7、om IHS-,-,- _-_- MIL-G-L937A 92 999990b OLL0743 7 W MI L-G-81937A 2.1.2 Other Government documents, drawings, and publications. The fol lowing other Government documents, drawings, and pub1 i cations form a part of this specification to the extent specified herein. PUB L I CAT I ON S CODE OF FEDERAL
8、 REGULATIONS 49 CFR - Transportation - Hazardous Materials. (Application for copies should be addressed to the Superintendent of (Copies of specifications, standards, handbooks, drawings, and publications Documents, Government Printing Office, Washington, DC 20402.) required by manufacturers in conn
9、ection with specific acquis! tion functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. which are indicated as DoD adopted shall be the i
10、ssue listed in the current DoDISS and the supplement thereto, if applicable. The issues of the documents ANSI 2129.1 - American National Standard for the Precautionary Labeling of Hazardous Industrial Chemicals. (Application for copies should be addressed to the American National Standards Insti tut
11、e, 1430 Broadway, New York, NY 10018.) AMERICAN SOC1 ETY FOR TESTING AND MATERIALS (ASTM) ASTM D 942 - ASTM D 972 - ASTM D 1264 - ASTM D 1403 - ASTM D 1743 - ASTM D 2265 - ASTM D 3337 - ASTM D 4048 - Oxidation Stabi 1 i ty of Lubricating Greases by the Oxygen Bomb Method. Evaporation Loss of Lubrica
12、ting Greases and Oi 1 s. Water Washout Characteristics of Lubricating Greases. Cone Penetration of Lubricating Grease Using One-Quarter and One-Hal f Scale Cone Equi pment. Corrosion Preventive Properties of Lubricating Greases. Dropping Poi nt of Lubri cati ng Grease Over Wide Temperature Range. Gr
13、eases in Small Bearings, Evaluation of. Effect of Grease on Copper (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Industry association specifications and standards are generally available for reference from 1
14、 i braries. groups and using Federal agencies.) They are al so distributed among techni cal 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification chal 1 take precedence. Provided by IHSNot for Resale
15、No reproduction or networking permitted without license from IHS-,-,-MI L-G-81937A 3. REQUIREMENTS 3.1 Qualification. The grease furnished under this specification shall be products which are qualified for listing on the applicable qualified products list at the time set for opening of bids (see 4.3
16、 and 6.3). 3.2 Material. The grease shall consist essentially of a lithium soap, a low temperature diester lubricant. The composition of the lubricant shall not otherwise be limited except to exclude silicone oils and additives that are not completely soluble in the base oil. 3.3 Physical properties
17、. Physical properties of the grease shall be in accordance with Table I. 3.4 Environment. The grease shall be formulated, processed, and packaged in a class 100,000 environment conforming to the requirements of FED-STD-209. 3.5 Material safety data sheets. Material safety data sheets shall be prepar
18、ed and submitted in accordance with FED-STD-313. Material safety data sheets shall also be forwarded as specified in 4.3.2. The grease shall have no adverse effect on the health of personnel when used for its intended purpose. Questions pertinent to this effect shall be referred by the contracting a
19、ctivity to the appropriate departmental medical service who will act as an advisor to the contracting agency (see 4.3.2 and 6.2.le). 3.6 Norkmanship. The grease, when examined visually, shall be a smooth and homogeneous mixture, free from lumps, abrasive materials, crystals, and extraneous material.
20、 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specifled in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the
21、 contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed
22、 necessary to assure supplies and services conform to prescribed requirements. herein are classified as follows: 4.2 Classification of inspections. The inspection requirements specified a. Qualification inspeetion (see 4.3). b. Quality conformance inspection (see 4.4). 4.3 Qualification inspection.
23、Qualification inspection shall consist of a review of the manufacturers test report (see 4.3.2) to determine that the qualification inspection sample (see 4.3.1) complies with all the requirements for the physical properties specified in Table I when tested in accordance with the inspection methods
24、specified in Table II and 4.6.3 through 4.6.3.2. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.3.1 Qualification inspection sample. The qualification inspection samele shall consist of 2.5 ka of qrease. The samele shall be forwarded to the Airc
25、raft and Crew Systems“Techo1ogy Directorate, Code 60612, Naval Air Development Center, Warminster, PA 18974. The sample shall be plainly identified by a securely attached durable tag or label marked with the fol lowing information: Sample for qualification inspection. Name of manufacturer. Product c
26、ode number. Batch number. Date of manufacture. Submitted by (name) (date) for qualification inspection in accordance with MIL-G-81937A under authorization of (reference authorizing letter) (see 6.3). GREASE, INSTRUMENT, ULTRA-CLEAN 4.3.2 Test reports. Two copies of the manufacturers test report, con
27、taining complete test data showing that material submitted for qualification conforms to the requirements of this specification, shall be submitted with the qualification sample. which produced the sample tested shall also be supplied. Material safety data sheets shall be prepared in accordance with
28、 FED-STD-313 (see 3.5) and submitted to the qual i fyi ng 1 aboratory (see 4.3.1 ) . Location and identity of the plant 4.3.3 Retention of qualification. In order to retain qualification of a product approved for listing on the Qualified Products List (QPL), the manufacturer shall verify by certific
29、ation to the qualifying activity, that the manufacturers product compl i es with the requirements of this specification. two-year intervals from the date of original qualification. The Government reserves the right to re-examine the qual ified product whenever deemed necessary to deterinine that the
30、 product continues to meet any or all of the spec i fi cat i on requ i remen t s. The time of periodic verification by certification shall be in 4.4 Qual i ty conformance inspection. The qual i ty conformance inspection of the urease shall consist of tests of samDles from 4.4.2.2 in accordance with
31、Table III and an examination of samples from 4.4.2.1 for conformance with 4.6.1. Samples shall be labeled completely with the information identifying the purpose of the sample, name of product, specification number, lot and batch number, date of sampl ing and contract number. 4.4.1 Lot formation. A
32、lot shall consist of all the grease produced by In the event the process is a batch operation, each batch one manufacturer, at one plant, from the same materials and under essentially the same conditions, provided the operation is continuous and does not exceed a 24 hour period. constitutes a lot (s
33、ee 6.4). 4.4.2 Sampling. 4.4.2.1 For examination of filled containers. A random sample of filled containers, fully prepared for delivery, shall be selected from each lot of grease in accordance with MIL-STD-105,- inspection level II with an acceptable quality level (AQL) of 2.5 percent defective. 4
34、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-81937A 91 9 7777906 OL107LIb 4 m MI L-G-8 1 937A 4.4.2.2 For tests. The sample for tests shall consist of a 0.25 kg sample of grease taken at random from each lot of grease. unacceptable if the sa
35、mple fails to comply with any of the tests specified in Table III and 4.6.3 through 4.6.3.2. The lot shall be 4.5 Inspection conditions. 4.5.1 Test conditions. Test conditions shall be in accordance with 4.6 and the physical values specified in Table I apply to the average of determinations made on
36、the sample. Unless otherwise specified, all tests shall be conducted on unworked grease. 4.6 Methods of examinations and tests. 4.6.1 Examinations. Each of the filled containers selected in accordance with 4.4.2.1, shall be examined for defects of the container and closure, for evidence of leakage a
37、nd for unsatisfactory markings to determine conformance with 5.1 and 5.2. Each sample container shall also be weighed to determine the amount of contents. If the number of defective containers exceeds the acceptance number of the sampling plan specified in 4.4.2.1, the lot shall be rejected. 4.6.2 T
38、ests. Tests shall be performed in accordance with Table II and 4.6.3 through 4.6.3.2 to determine conformance with the requirements specified in 3.3. 4.6.3 Low temperature torque. 4.6.3.1 Apparatus. A suitable torque test apparatus assembly is illustrated in Figure 1. It consists of the components d
39、escribed as follows: a. b. Low temperature box. Use a well insulated cold box of at least 0.03 cubic meters interior size, in which the temperature can be controlled and maintained within 0.5“C of the -54C test temperature. Baffles shall be used, if necessary, to prevent direct radiation between the
40、 test bearing and the cooling medium. The drive mechanism can be mounted externally as shown schematically in Figure 2. externally, the temperature, measured at a point on the surface of the test shaft between the test bearing and the wall of the box, shall be not more than 0.5“C above the test temp
41、erature. When the drive is mounted Bearing. Select an R4A4 size open ball bearing containing eight balls separated by a two piece pressed steel cage, and manufactured to ABEC-I tolerances. After having been cleaned and dried, the bearing shall show no roughness or catching when rotated between the f
42、ingers while applying a light pressure axially and then radially, Lubricate the bearing with an oil having a viscosity of five centistokes at 99C. running torque at room temperature, and note the maximum running torque peaks. The average shall not exceed 0.0005 Nm, and no peak should be measured ove
43、r 0.001 Nm. If values fall below these limits, the bea-ring is suitable for the grease torque test. Determine the 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-C. d. e. f. 4.6.3.2 a. b. C. d. e. f. MIL-G-L737A 73 M 777770b 0330747 b - - MI L-G-81
44、937A Drive Assembly. receive the test bearing against a shoulder no higher than the inner race shoulder of the bearing. A spacer washer of the same diameter along with a lock nut shall be used to clamp the inner ring of the test bearing to the 1 rpm shaft. As shown in Figure 2, the test shaft shall
45、Housing. and load disc made in accordance with Figure 3. Use a balanced low temperature torque bearing housing Torque measuring equipment. dynamometer scale with a 203 mm (eight inch) face and a zero to 0.45 kg range. Consisting of a calibrated Grease cup and spindle. As shown in Figure 4. Procedure
46、. The procedure shall be as follows: Wash the selected test bearing thoroughly in a suitable petroleum solvent and rinse with grease analysis naphtha or petroleum ether. Dry the bearing for at least five minutes in a warm oven (not over 99C). temperature before proceeding. Permit the bearing to cool
47、 to room Mount the clean, dry bearing on a hand spindle (Figure 4, fastening the inner race by means of the washer and screw. Fill the grease cup (Figure 4) about three fourths full with the test grease, using a clean, steel spatula. Force the bearing down into the grease while rotating the inner ri
48、ng and spindle slowly to insure working the grease into all parts of the bearing. When the bearing bottoms in the cup, take it out and remove it from the spindle. Turn the bearing end for end and refasten it to the spindle. Repack the excess grease into the grease cup. Again, force the bearing into
49、the cup until it bottoms. Remove the spindle and bearing as a unit. Scrape the excess grease off flush with the sides, filling any visible voids and then remove the spindle. not to rotate the bearing at any time after striking the grease flush and prior to measurement of the starting torque. Care should be taken Insert the packed bearing into the test housing and fasten the clamp cap over the bearing. With the low temperature box prechilled to the test temperature
