1、MIL-P-29609 26 June 1995 MILITARY SPECIFICATION POLYIMIDE RETAINER MATERIAL, POROUS NON-METALLIC This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers basic characteristics required for porous polyimide mate
2、rials intended for use as instrument and thin section ball bearing retainers (cages), and methods of determining these characteristics. 1.2 Classification. The materials shall be furnished in the following types and forms as specified (see 6.2). Form RM - Rods, molded 2. APPLICABLE DOCUMENTS 2.1 Gov
3、ernment documents. 2.1.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense
4、Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS MILITARY MIL-P-116 - Methods of preservation. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document s
5、hould be addressed to: Commander, Naval Air Warfare Center, Code 41K2008120-3, Highway 547, Lakehurst, NJ 08733-5100, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 9330 DISTRIBUTION STATEMENT
6、A. Approved for public release; distribution is unlimited. Licensed by Information Handling ServicesMIL-P-29b09 m Ob 2003932 97T m MIL-P-29609 STAN DA RD S MI L ITARY MIL-STD-129 - Marking for Shipment and Storage. MIL-STD-831 - Test Reports, Preparation of. (Unless otherwise indicated copies of fed
7、eral and military specifications, standards, and handbooks are available from DODSSP-Customer Service, Standardization Document Order Desk, 700 Robbins Avenue, Bldg. 40, Philadelphia, PA 19111-5094.) 2.2. Non-Government publications. The following documents form a part of this document to the extent
8、 specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitati
9、on (see 6.2). AMERICAN SOCIETY FOR QUALITY CONTROL (ASQC) ASQC-Z1.4 - Sampling Procedures and Tables for Inspection by Attributes. (Applications of copies should be addressed to the American Society for Quality Control, 310 West Wisconsin Avenue, Milwaukee, WI 53203.) AMERICAN SOCIETY FOR TESTING AN
10、D MATERIALS (ASTM) ASTM-D2240 - Rubber Property-Durometer Hardness. ASTM-D2873 - Porosity, Mercury Intrusion Porosimetry. ASTM-D3951 - Packaging, Commercial. (Applications for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1187.
11、) (Non-Government standards and other pub1 ications are normally available from the organizations that prepare or distribute the documents. These documents also may be available in or through libraries or other informational services.) 2.3 Order of precedence. In the event of a conflict between the
12、text of this document and the references cited herein (except for related associated detail specifications, specification sheets or MS standards), the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has
13、 been obtained. 3. REQUIREMENTS 3.1 General requirements. 2 Licensed by Information Handling Services- MIL-P-29609 m 9999906 2003933 BO6 = MIL-P-29609 3.1.1 Material. Material shall be polyimide, organic condensation polymers derived from the reaction between aromatic dianhydrides and aromatic diami
14、nes. 3.1.2 Construction. This material shall consist of powder mixed, cured and uncured, to obtain a specified pore size and pore volume. The material is formed through the isostatic molding of the cured and uncured milled polyimide powders. 3.1.3 Characteristics. The material shall have the followi
15、ng characteristic values. These values apply only to standard sizes of rods and tubes listed in Table I. The characteristic requirements for special sizes shall be specified (see 6.2). 3.1.3.1 Hardness. Material shall have a minimum hardness of 84 Shore D. 3.1.3.2 Apparent density. Material shall ha
16、ve an apparent density between 1.1 and 1.2 grams per cubic centimeter (g/cc). 3.1.3.3 Rins tensile strenqth. Material shall have a minimum ring tensile strength of 2000 pounds per square inch (psi). 3.1.3.4 Porosity. Material shall have pore diameter from 0.95 (140.4 pounds per square inch, absolute
17、 (psia) to 1.25 microns (144.7 psia) at a corresponding intrusion volume from 0.08 to 0.10 cc/gram, the total intrusion volume to be 0.13 to 0.20 cc/gram inclusive at an intrusion pressure of 1500 psia. The shape of the intrusion curve shall be similar to that shown in Figure 1. 3.1.4 Material defec
18、ts. Material shall be considered defective if any debris or more than five non-polyimide inclusions over 0.010 inch in any dimension are found in any diametrical cross section. 3.1.5 Color. The color varies and shall not be a cause for rejection. 3.1.6 Dimensions and tolerances. 3.1.6.1 Lenqths. Sta
19、ndard and minimum lengths per diameter shall be as specified in Table I. At least 75 percent of the rods of any given shipment shall be standard length or longer and no more than 25 percent of a given shipment shall be supplied in lengths between the minimum and standard shipping lengths without pri
20、or approval. 3.1.6.2 Diameters. Diameters shall be specified (see 6.2) at the time of order. Standard sizes are covered in Table I. 3.1.7 Erosion resistance. The test specimen shall show no sign of degradation after a minumum of five complete cycles (see 4.5.8). 3.2 Qualification. Material furnished
21、 under this specification shall be authorized by the qualifying activity for listing on the applicable qualified products list (QPL) at the time of award of contract (see 4.5 and 6.2). 3 Licensed by Information Handling Services MIL-P-29609 = 9999906 2003934 742 Standard ( oils from the hands are re
22、adily absorbed by the material and could cause inaccuracies in the density calculation. 4.5.4 Rinq tensile strenqth. A minimum of two tensile specimens (see 3.1.3.3) will be machined from the screen end of one rod selected at random from the molded batch. diameter of the rod (see Figure 2). All ring
23、s shall be tested at the uniform speed of 0.200 t 0.050 inches/minute. shall be the nominal, 2 0.001 inches. Specimen dimensions will be according to the The test fixtures split rod diameter 7 Licensed by Information Handling ServicesC 2.005 OD 2.00 E 2 Min MIL-P-29609 -*I I SEATED S Q U AR E LY 1 I
24、 I I I (LOADING TO BE ON 5 .005) TENSILE TOOLING TENSILE SPECIMEN Bar Stock I Size OA 2.005 OB 2.001 Up to and i ncl udi ng 3/4 dia. dia. up to and includ- ing 1-1/4 dia. .475 ,312 500 750 ,950 .360 1 .950 1 .375 dia. I Over 1-1/4 1.250 FIGURE 2. Rinq tensile strength. 8 Licensed by Information Hand
25、ling ServicesMIL-P-29609 4.5.4.1 Calculation. Ring tensile strength (RTS) is the maximum stress sustained by the specimen during the test and is calculated as follows: P RTS = C (OA-OB) where P is the maximum load and OA, OB, and C are listed in Figure 2. and OB are diameters. OA 4.5.5 Porosity. Por
26、e size distribution and pore volume (see 3.1.3.4) shall be measured using a mercury intrusion porosimeter in accordance with ASTM-D2873. 4.5.5.1 Procedure. A minimum of one sample per molding lot shall be tested. at a point 1/2 inch from the plug end. screen end. The rod is to be selected at random
27、and tested as follows: The sample shall be a 1/4 inch thick cross section of the rod taken The plug end is the end opposite the a. The sample is to be fractured into a single specimen approximately one gram in weight. b. Weigh and record the sample weight to 0.0001 grams. c. Conduct mercury intrusio
28、n porosimetry over a pressure range of 30 to 1500 psia, a mercury contact angle of 130, and a mercury surface tension of 485 dyneslcentimeter (cm). d. Compare the data to the specification limits of 3.1.3.4. Typical trace and visual portrayal of 3.1.3.4 is depicted in Figure 1. Failure of this sampl
29、e to meet 3.1.3.4 will necessitate reinspecting the molding lot per ASQC-Z1.4, 1.5 AQL, normal inspection, Level II, AC=O, RE=l, before acceptance. 4.5.6 Lenqth. As specified in 3.1.6.1, length shall be measured to 0.10 inch. The length shall be the shortest axial dimension of the rod taking into ac
30、count angled or chipped ends. 4.5.7 Diameter. As specified in 3.1.6.2, diameter shall be the maximum diameter measured to the nearest 0.001 inch. 4.5.8 Erosion resistance. As specified in 3.1.7, erosion resistance shall be determined on one slug, cut from the plug end of every rod in the lot. The sl
31、ug shall be 1/2 to 3/4 inch thick. It shall be polished on polishing wheels until smooth, scratch-free, and flat. Polished slugs shall be tested for erosion resistance as follows: 9 Licensed by Information Handling Services MIL-P-29609 9999906 2003940 T4b W MIL-P-29609 a. The slugs shall be water im
32、pregnated at 24 millimeters (mm) of Hg for 10112 minutes. b. The slugs shall then be ultrasonically cleaned in water at 200 Cavons for 10+2 minutes using Branson E-Module or equivalent at full power of 40 Kilohertz (KHz). c. The water shall be discarded and the slugs shall be vacuum dried at 8025OC
33、for 30+5 minutes. d. Repeat b and c. e. The slugs shall be visually inspected at 30X for erosion. If no erosion is detected, return to step (a). This represents one cycle of the five cycles minimum. If erosion is present, discontinue testing. Molding lot is unacceptable. 4.5.9 Inspection of preparat
34、ion for deliverv. Sample packages and packs shall be selected and inspected in accordance with MIL-P-116 to verify conformance to the requirements of Section 5. 4.6 Retention of qualification. To retain qualification the manufacturer shall forward a report to the qualifying activity in accordance wi
35、th MIL-STD-831 at 24 month intervals. The report shall consist of the information specified in 4.3 (see 6.3 and 6.4). 5. PREPARATION FOR DELIVERY 5.1 Packaqinq. Material to be packaged in accordance with ASTM-D3951. 5.2 Markinq. In addition to any specific marking required by the contract or order,
36、the interiors and exteriors of the shipping containers shall be marked in accordance with MIL-STD-129. 6. NOTES (This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.) 6.1 Intended use. Polyimide produced to this specification is intended for
37、 instrument and thin section ball bearing retainers (cages). 6.2 Acauisition requirements. Acquisition documents must specify the following: a. Title, number and date of this specification. b. Issue of DODISS to be cited in solicitation, and if required, the specific issue of individual documents re
38、ferenced (see 2.2). 10 Licensed by Information Handling Services- MIL-P-29609 9999906 200L94L 982 MIL- P-29609 c. Form material data required with each order. (1) Nominal diameter. (2) Total inches per lot. (3) Lot number. (4) Rod identification. (5) Lot porosimetry data. (6) Lot average ring tensil
39、e strength. (7) Lot average hardness, Shore D. (8) Lot average apparent density. 6.3 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 29609 whether or
40、 not such products have actually been so listed by that date. 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 co
41、ntracts or purchase orders for the products covered by this specification. Commander, Naval Air Systems Command (AIR-4.1.9), 1421 Jefferson Davis Highway, Arlington, VA 22243-4190, and information pertaining to qualification of products may be obtained from that activity. The attention of The activi
42、ty responsible for the Qualified Products List is 6.4 Consideration of data requirements. The following data requirements should be considered when this specification is applied on a contract. applicable Data Item Descriptions (DIDs) should be reviewed in conjunction with the specific acquisition to
43、 ensure that only essential data are requestedlprovided and that the DIDs are tailored to reflect the requirements of the specific acquisition. To ensure correct contractual application of the data requirements, a Contract Data Requirements List (DD Form 1423) must be prepared to obtain the data, ex
44、cept where DOD FAR Supplement 227.405-70 exempts the requirement for a DD Form 1423. The Reference Paraqraph DID Number DID Title Suqqested Tailorinq 4.6 DI-NDTI-80809A Test/Insp Paragraph 10.2.7 Report The above DID was cleared as of the date of this specification. The current issue of DOD 5010.12-
45、L, Acquisition Management Systems and Data Requirements 11 Licensed by Information Handling Services MIL-P-29609 rn 9999906 20019Lt2 A19 = MIL-P-29609 Control List (AMSDL), must be researched to ensure that only current, cleared DIDs are cited on the DD Form 1423. 6.5 6.6 Susses t ed source. Furon,
46、Advanced Polymers Division Dixon Facil i ty 386 Metacom Avenue Bristol, Rhode Is1 and 02809 Subject term kev word) 1 istinq. Bearings Cage Separators Custodians: Army - MI Navy - AS Air Force - 84 Preparing activity: Navy - AS (Project 9330-1174) Review activities: Navy - CH 12 Licensed by Information Handling Services
