1、 Comments, suggestions or questions on this document should be addressed to Defense Supply Center Columbus, ATTN: VAT, Post Office Box 3990, Columbus, OH 43218-3990, or emailed to switchdla.mil. Since contact information can change, you may want to verify the currency of this address information usi
2、ng the ASSIST Online database at http:/www.assist.daps.dla.mil/. AMSC N/A FSC 5930 INCH-POUND MIL-DTL-5423E 17 February 2009 SUPERSEDING MIL-DTL-5423D 5 April 2002 DETAIL SPECIFICATION BOOTS, DUST AND MOISTURE SEAL (FOR TOGGLE AND PUSH-BUTTON SWITCHES, CIRCUIT BREAKERS, AND ROTARY-ACTUATED PARTS), G
3、ENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the general requirements for molded silicone rubber boots which can be used on component parts such as toggle and pushbutton swi
4、tches, circuit breakers, and rotary-actuated parts such as rotary switches, variable resistors, capacitors, inductors, and transformers. The boots protect the component parts-actuating mechanism from sand, dust, water and other contaminants, and seal the panel on which the component parts are mounte
5、d. 1.2 Classification. The boots covered by this specification be one of the types and styles as shown below. The applicable information will be as shown on the individual specification sheet (see 3.1). Type A - For panel mounted toggle switches and circuit breakers. Style 1 - One-hole mounting, enc
6、losed. Style 3 - One-hole mounting, through. Style 4 - Three-hole mounting, through. Style 6 - One-hole mounting, miniature, enclosed. Style 7 - One-hole mounting, subminiature, enclosed. Style 8 - One-hole mounting, subminiature, through. Style 9 - Five-hole mounting, through. Style 10 - Panel bush
7、ing seal only. Type B - For bushing mounted pushbutton switches. Style 1 - One-hole mounting adapter type. Style 2 - One-hole mounting drilled panel. Style 3 - One-hole mounting through. Style 4 - One-hole mounting miniature, drilled panel. Style 5 - Three-hole mounting (for telephone handset switch
8、es). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-5423E 2 Type C - For bushing mounted rotary actuated parts. Type D - For use as seals for lever operated circuit breakers. Style 1 - Panel mounted without mounting frame. Style 2 - Panel mo
9、unted complete with mounting frame. 1.2.1 Military Part or Identifying Number (PIN). The term Part or Identifying Number (PIN)is equivalent to the term part number which was previously used in this specification. The military PIN (when applicable) will consist of the letter “M“, the basic number of
10、the specification sheet, an assigned dash number (see 3.1). M I 5423/07 I -06 I Military Specification Dash designator sheet number number 2 APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include d
11、ocument cited in other sections of this specification or recommended for additional 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 and 4
12、 of this specification, whether or not they are listed. 2.2 Governments documents. 2.2.1 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 docum
13、ents are those cited in the solicitation or contract. FEDERAL STANDARDS FED-STD-H28 - Screw Thread Standards for Federal Services. COMMERCIAL ITEM DESCRIPTIONS A-A-59588 - Rubber, Silicone. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-7703 - Guard, Switch. DEPARTMENT OF DEFENSE STANDARDS MIL-STD-202
14、 - Test Methods for Electronics and Electrical Component Parts. MIL-STD-1285 - Marking of Electrical and Electronic Parts. (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Phila
15、delphia, PA 19111-5094.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-5423E 3 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of t
16、hese documents are those cited in the solicitation or contract. SOCIETY OF AUTOMOTIVE ENGINEERS (SAE) SAE-AMS-QQ-N-290 - Nickel Plating (Electrodeposited). (Copies of these documents are available online at http:/www.sae.org or from Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale
17、, Pennsylvania, 15096-0001) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein (except for related specification sheets), the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and r
18、egulations unless a specific exemption has been obtained. 3.0 REQUIREMENTS 3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable specification sheet. In the event of any conflict between requirements of this specification and th
19、e specification sheet, the latter shall govern (see 6.2). 3.2 First article and quality conformance inspections. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance to 4.3 3.3 Materials. The materials shall be as specified herein. However, when definite ma
20、terials are not specified, materials shall be used which will enable the boots to meet the performance requirements of this specification. Acceptance or approval of any constituent material shall not be construed as a guaranty of the acceptance of the finished product (see 4.2). 3.3.1 Silicone rubbe
21、r. Boots shall be molded of silicone rubber in accordance with A-A-59588, class 3a, grades 25, 50, or 60 as specified (see 3.1). Unless otherwise specified (see 6.2), the color shall be gray. 3.3.2 Metals. Metals shall be of corrosion resistant material, or shall be suitably protected to resist corr
22、osion. Alternative protective finishes, as approved by the qualifying activity. For additional information and guidance on plating, see 6.4. 3.3.3 Lubricant. Sealing portions of the boot which come in intimate contact with the actuating lever or shaft of the component part on which it is mounted, sh
23、all be lubricated as specified (see 3.1) with a transparent permanent lubricant. The lubricant shall not cause deleterious effects in the physical properties of the rubber; i.e., deterioration of the rubber, embrittlement, softening or swelling of the rubber, and shall in no manner prevent the boots
24、 from complying with any other requirements of this specification. 3.3.4 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin content of switch components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimu
25、m of 3 percent lead, by mass (see 6.4.2). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-5423E 4 3.4 Design and construction. Boots shall be of the design, construction, and physical dimensions specified (see 3.1). For boots having metal ins
26、erts, design of the insert shall provide for mechanical (metal-to-panel) stop against the panel to which the boot is mounted. The purpose of the stop is to prevent over-tightening of the boot and to avoid damage to the sealing member. Unless otherwise specified, all threaded parts shall be in accord
27、ance with FED-STD-H28. 3.5 Restoring force (torque) (applicable only to type A boots without shielding). When boots are tested in accordance with 4.6.2, the force required to restore the boot to either extreme position shall not exceed 5 inch-ounces unless otherwise specified (see 3.1). The time to
28、complete the switch actuator movement a minimum of 20 degrees shall not exceed 5 seconds in either direction. 3.6 Watertightness. When boots are tested as specified in 4.6.3 through 4.6.3.2, as applicable, there shall be no evidence of water leakage into the test enclosure, or a continuous stream of
29、 air bubbles through or around the component-part mounting bushing, if applicable. 3.7 Durability. 3.7.1 Operation of guards (applicable only to type A styles used with hinged-type guards (see 3.1). When boots are tested as specified in 4.6.4.1, type A boots suitable for use with hinged-type guards,
30、 such as those in accordance with MIL-DTL-7703, shall not interfere with the satisfactory operation of the guard. There shall be no evidence of damage to the boot. 3.7.2 Installation. When boots are tested as specified in 4.6.4.2, there shall be no evidence of tearing of the boot. 3.8 Sand and dust.
31、 When boots are tested as specified in 4.6.5, there shall be no evidence of entrance of sand or dust from the front of the switch panel. 3.9 Vibration. When boots are tested as specified in 4.6.6, there shall be no evidence of loosening of the boot. 3.10 Salt Atmosphere (corrosion) (applicable only
32、to boots with threaded inserts or metal frames. As a result of the test specified in 4.6.7, there shall be no evidence of excessive corrosion. Excessive corrosion shall be construed as any corrosion which exposes the base metal. 3.11 Endurance. When boots are tested as specified in 4.6.8 through 4.6
33、.8.3, there shall be no evidence of brittleness or cracking. The boot shall not cause the switch actuator to bind or malfunction during the test. 3.12 Lubricant. When tested as specified in 4.6.9.1, the lubricant shall show no signs of flow, creep, or spread, nor shall the lubricant sink into the ru
34、bber thicken, evaporate, or leave a dry, opaque film or residue. The lubricant shall not have congealed to a point where it no longer functions as a lubricant when tested as specified in 4.6.9.2. 3.13 RFI shielding (applicable only to boots having an RFI shielding rating - “S“). When boots are teste
35、d in accordance 4.6.10, the resistance value shall not exceed 1 ohm before the endurance test and 1.5 ohms following the endurance test. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-5423E 5 3.14 Marking. The unit package shall be marked in
36、 accordance with method I of MIL-STD-1285. The marking shall include as a minimum: a. Military Part or Identifying Number (PIN) b. Manufacturers name, trademark, or federal supply code for manufacturers. c. Date code. 3.15 Workmanship. Boots shall be processed in such a manner as to permit them to m
37、eet all the requirements of this specification. Flash shall be kept to a minimum consistent with good molding practice, and in no case shall rubber prevent the proper installation of the boot on the applicable switch or test plug. 4. VERIFICATION 4.1 Classification of inspections. The inspection req
38、uirements specified herein are classified as follows: a. Materials inspection (see 4.2). b. First article inspection (see 4.4). c. Conformance inspection (see 4.5). 4.2 Materials inspection. Materials inspection shall consist of certification, supported by verifying data, that the materials listed i
39、n table I that are used in fabricating the boots are in accordance with the applicable referenced specifications or requirements prior to such fabrication (see 3.3). TABLE I. Materials inspection. Material Requirement Paragraph Applicable specification Silicon rubber Material/plating 3.3.1 3.3.2 A-A
40、-59588 SAE-AMS-QQ-N-290 1/ 1/ Alternative protective finishes, as approved by the qualifying activity, may be utilized. For additional information on plating see 6.4. 4.3 Inspection conditions. Unless otherwise specified herein, all inspections shall be performed in accordance with the test conditio
41、ns specified in the “GENERAL REQUIREMENTS” of MIL-STD-202. 4.3.1 Test plugs. The installation, sand and dust, vibration, endurance, and watertightness inspections of type C boots shall be made while the boots are mounted on test plugs which shall be assembled from interchangeable shafts and bushings
42、 in accordance with figure 1. The details of shafts and bushings to be used in the assembly of the applicable test plugs shall be as specified (see 3.1). Fifty percent of the boots shall be tested with the applicable maximum shaft-size test plug and fifty percent of the boots shall be tested with th
43、e applicable minimum shaft-size test plug Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-5423E 6 4.4 First article inspection. First article inspection shall be performed at a laboratory acceptable to the Government (see 6.3) on sample units
44、 produced with equipment and procedures normally used in production (see 3.2). 4.4.1 Sample size. Ten sample boots of each military PIN shall be subjected to qualification inspection as specified in table II or III, as applicable. 4.4.2 Test slab. A 6-inch by 6-inch by 0.075-inch thick slab of rubbe
45、r as the same grade (see 3.1 and 3.3.1) as the boots under test shall be submitted for the lubricant test. 4.4.3 Failures. One or more failures shall be cause for refusal to grant qualification approval. 4.4.4 Verification of Qualification. Every 12 months, the manufacturer shall provide verificatio
46、n of qualification to the qualifying activity. Continuation is based on meeting the following requirements: a. Design of switch has not been modified (every 12 months). b. Verification of group A lot acceptance (every 12 months). c. Verification of group B lot acceptance (every 12 months). 4.5 Quali
47、ty conformance inspection. 4.5.1 Inspection of product for delivery. Inspection of product for delivery shall consist of groups A and B inspections. 4.5.1.1 Inspection lot. An inspection lot shall consist of all of the boots of the same type, style, and size produced under essentially the same condi
48、tions and offered for inspection at one time. 4.5.1.2 Group A inspection. Group A inspection shall consist of the inspections specified in table IV. 4.5.1.2.1 Sampling plan. Samples shall be randomly selected in accordance with table V, group A inspection sampling plan. For acceptance of the lot the
49、re shall be zero occurrences of defects. 4.5.1.2.2 Rejected lots. If an inspection lot is rejected, the lot shall be 100 percent inspected for the defects noted. The contractor may correct all of the defects or remove all of the defective units from the lot. The lot shall then be sampled and inspected again in accordance with tables II and V. For acceptance, there shall be zero occurrences of defects. Such lots shall be separate from n
