1、MIL-A-23054A 56 m 9999906 0213794 4 E g-i7g-o“c MIL-A-23054A(SH) 18 August 1982 SUPERSEDING MIL-A-23054(SHIPS) 24 October 1961 (See 6.5) “ e MILITARY SPECIFICATION ACOUSTIC ABSORPTIVE BOARD, FLBROUS GLASS PERFORATED FIBROUS GLASS CLOTH FACED This speciication is approved for use by the Naval Sea Sys
2、tems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. - 1. SCOPE I 1.1 This specification covers the requirements for fibrous glass acoustic absorptive board with a perforated fibrous glass cloth facing. 2. APPLICABLE DOCUMENTS 2
3、.1 Government documents. 2.1.1 Specifications and standards. Unless otherwise specified, the following specifications and standards of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) specified in the solicitation form a paft of this specific
4、ation to the extent specified herein. SPECIFICATIONS FEDERAL PPP-B-576 - Boxes, Wood, Cleated, Veneer, Paper Overlaid. PPP-B-585 - Boxes, Wood, Wirebound. PPP-B-591 - Boxes, Fiberboard, Wood, Cleated. PPP-B-636 - Boxes, Shipping, Fiberboard. PPP-B-640 - Boxes, Fiberboard, Corrugated, Triple-Wall. MI
5、LITARY MIL-1-742 - Insulation Board, Thermal Fibrous Glass, NIL-A-3316 - Adhesives, Fire Resistant, Thermal Insulation. - 1- FSC 5640 P Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander,
6、 Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document 01: by letter. c Provided by IHSNot for ResaleNo reproduction or networking permitted with
7、out license from IHS-,-,-MIL-L-10547 - Liners, Case, and Sheet, Overwrap. Water MIL-C-20079 - Cloth, Glass; Tape, Textile, Glass; and Vaporproof or Waterproof, Flexible. Thread, Glass. STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection MIL-STD-129 - Marking for Shipment a
8、nd Storage, by Attributes. (Copies of specifications and standards required by contractors in connection with specific acquisition 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 thi
9、s specification to the extent specified herein. The issues of the documents which are indicated as DoD adopted shall be the issue listed in the current DoDISS and the supplement thereto, if applicable. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) C 423 - Sound Absorption and Sound Absorption Co
10、efficient by E 84 - Standard Test Method for Surface Burning Character- the Reverberation Room Method. istics of Building Materials. (DoD adopted) (Application for copies should be addressed to the American Society for Tasting and Materials, 1916 Race Street, Philadelphia, PA 19103,) NATIONAL MOTOR
11、FREIGHT TRAFFIC ASSOCIATION, INC, AGENT National Motor Freight; Classification UNIFORM CLASSIFICATION COMMITTEE AGENT Uniform Freight Classification Ratings, Rules and Regulations (Application for copies should be addressed to the Uniform Classifica- tion Committee Agent, Tariff Publication Officer,
12、 Room 1106, 222 South Riverside Plaza, Chicago, IL 60606.) (Industrf association specif cations and standards are generally available far reference from libraries. They are also distributed among technical groups and using Federal agencies.) 2.3 Order of precedence. In the event of a conflict betwee
13、n the text of this specification and the references cited herein, the text of this specifica- tion shall take precedence, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MITA-A-23054A( SH) 3. REQUIREMENTS 3.1 First article. When specified (see 6.2.1)
14、, the contractor shall furnish sample unit(s) for first article inspection and approval (see 4.2.1 and 6.3). 3.2 Material. The acoustic absorptive board shall be a laminate consist- ing of a perforated fibrous glass cloth facing, a high density fibrous glass. layer, and a fibrous glass backing board
15、. Asbestos fibers and components containing asbestos fibers are prohibited. A certificate of compliance shall bs required that the material is asbestos free in accordance with the data ordering document specified (see 6.2.2). 3.2.1 Backing board. The backing board shall conform to type II of MIL-1-7
16、42 unfaced board with the following exception: The board shall be furnished in nominal thickness of 20 millimeters (mm) (3/4-inch) or 45 mm (1-3/4-inch) (see 3.2.2 and 3.4.2). 3.2.2 High density fibrous glass laye-r. The fibrous glass layer shall have a density of not less than 160 kilograms per cub
17、ic meter (kg/m3) (10.pounds per cubic foot (lb/ft3) (see 4.5.1). The layer shall consist of glass fibers impregnated with a suitable binder and compressed or otherwise formed into a waffle. The nominal thickness of the high density fibrous glass layer shall be 6.0 mm (1/4-inch) (see 6.2.1). A certif
18、icate of compliance is required to establish the density of the high density layer in accordance with the data ordering document specified (see 6.2.2), 3.2.2.1 Waffle. The waffle shall be constructed having 5.0 mm (3/16-inch) deep indentations tapering from a nominal 6.0 mm (1/4-inch) diameter to a
19、nomi- nal 3.0 mm (1/8-inch) diameter, on the 13.0 m (1/2-inch) centers. 3.2.3 Fibrous.glass cloth facing. The cloth used for facing the high density fibrous glass layer shall conform to type I, -class 2 of MIL-C-20079, The cloth facing shall be impregnated with a hardening agent. The cloth facing sh
20、all be perforated with nominal 5.0 mm (3/16-inch) diameter holes on 13.0 mm ( 1/2-inch) centers. 3.2.3.1 Facing adhesive. The impregnated fibrous glass cloth facing shall be compatible with adhesive conforming to type II of MIL-A-3316. The adhesive strength requirements for securing fibrous glass cl
21、oth facing to the high density fibrous glass layer shall conform to MIL-A-3316. 3.2.4 Recovered materials. Unless otherwise specified herein, all mate- rial incorporated in the acoustic absorptive board covered by this specifica- tion shall be new and shall be fabricated using materials produced fro
22、m recov- ered materials to the maximum extent practicable without jeopardizing the intended use, The term “recovered materials“ means materials whFch have been collected or recovered from solid waste and reprocessed to become a source of raw materials, as opposed to virgin raw materials. None of the
23、 above shall be interpreted to mean that the use of used or rebuilt products is allowed under this specification unless otherwise specifically specified. 3.3 Construction. One side of the high density fibrous glass layer shall be adhered to the backing board and the other side adhered to the fibrous
24、 glass cloth facing, using adhesive. The fibrous glass cloth facing shall be free of 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-wrinkles or other irregularities. The acoustic absorptive board shall be so designed that the perforations in the f
25、ibrous glass cloth facing shall be centered over the indentations in the waffle-type high density fibrous glass layer. 3 . 4 Dimensions . 3.4,l Width and length, Unless otherwise specified (see 6.2.1), the acoustic absorptive board shall be furnished in a width of 610 m (24 inches) and a length of 9
26、15 mm (36 inches) (see 4,4). 3.4.2 Thickness. The acoustic absorptive board shall be furnished in thicknesses of 25.0 mm (1 inch) or 51.0 mm (2 inches), as specified (see 4.4 and 6.2,1), 3.4.3 Tolerances. Tolerances on length and width shall not exceed 6.0 mm (1/4 inch). Tolerance on thickness shall
27、 not exceed 2.0 mm (3/32 inch). 3.5 Fire resistance. The acoustic absorptive board shall have a flame spread index less than 30 and smoke development less than 100 when tested as specified in 4.5.2. A certificate of compliance shall be required in accordance with the data ordering document specified
28、 (see 6.2.2 and 6.3.1). 3.6 Facing separation. When the acoustic absorptive board is cut or sawed, the threads sf the fibrous glass cloth facing across which the cut is made shall not: be separated from the face over a distance of more than 3.0 mm (1/8 inch). En case the fibrous glass cloth facing d
29、oes not cover the entire surface of the board, the uncovered portion of the board shall not extend further than 3.0 mm (1/8 inch) from any edge. The fibrous glass cloth facing shall not extend over the edge of the board. 3.7 Sound absorption. When tested as specified in 4.5.3, the acoustic absorptiv
30、e board shall have coefficients of absorption that are equal to or greater than those shown in table I. TABLE I. Minimum sound absorption coefficents. 8oard Frequency, Hz 4. QUALITY ASSURANCE PROVISIONS 4.1 Respon,sibility for inspection. Unless otherwise specified in the contrast: or purchase order
31、, the contractor is responsible for the performance of alr.inspection requirements as specified herein. Except as otherwise speci- fied in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified here
32、in, unless disapproved by the Government, The Government reserves the right to perform any of the inspections set forth in the specification where such inspections am deemed necessary to assure supplies and services conform to prescribed requirements. Provided by IHSNot for ResaleNo reproduction or
33、networking permitted without license from IHS-,-,-c -. MIL-A-23054A 5b m 7779706 021377A L E 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: (a) First article inspection (see 4.2.1). (b) Quality conformance inspection (see 4.2.2). 4.2.1 Firs
34、t article inspection. First article inspection shall consist of the examination and tests shown in table II. TABLE II. First article insDection. Requirement Inspection paragraph Visual and dimensional 3.4 Dens i ty 3.2.2 Fire resistance 3.7 Sound absorption 3.5 examination Examination and test parag
35、raph 4.4 4.5.1 4.5.2 4.5.3 4.2.2 Quality conformance inspection. Quality conformance inspection shall constst of the visual and dimensional examination of 4.4. The density test of 4.5.1 and the fire resistance test of 4.5.2 are required at three year intervals except that new tests are required when
36、ever manufacturing methods are changed. Certificates of compliance are acceptable to establish manufacturing the data ordering document specified (see 6.2.2). , method consistency during the interim between test periods in accordance with 4.2.3 Test reports. Test reports shall be prepared in accorda
37、nce with the data ordering documents specified (see 6.2.2). 4.3 Sampling. 4.3.1 Inspection lot. For purposes of sampling, a lot shall consist of all boards of the.same thickness produced under essentially the same conditions, and offered for delivery at one time. 4.3.2 Sampling for visual and dimens
38、ional examination. A random sample of boards shall be selected from each lot offered for inspection in accord- ance with MIL-STD-105 at inspection level II. The acceptable quality level shall be 2.5 percent defective. 4.3.3 Quality conformance test sampling. When density and fire resistance tests MI
39、L-A-23054A 5b m 7977306 0213800 b m . b Unless otherwise specified (see 6.2.11, shipping containers shall have c-ase- liners conforming to MIL-L-10547 with caseliner closure and sealing as speci- fied in the appendix to the applicable container specification. Caseliners for -PPP-B-636 and PPP-B-640
40、boxes may be omitted provided all center, edge seams, and the manufacturers joint are sealed with pressure sensitive tape in accordance with the appendix to the applicable box specification. All boxes shall be closed, strapped, or banded in accordance with the applicable box specification or appendi
41、x thereto, with method V closure applicable to PPP-B-636 boxes. The gross weight of wood or wood-cleated boxes shall not. exceed 200 pounds. Fiberboard boxes shall not exce.ed the weight limitation for the applicable box selected. 5.2.2 Level B. Acoustic absorptive board shall be packed as specified
42、 in 5.2.1, except that the domestic type or non-weather resistant class container shall apply and caseliners are not required. Method I closure shall apply for PPP-B-636 boxes. 5.2.3 Level C. Acoustic absorptive board shall be packed in containers acceptable to the common carrier which will ensure s
43、afe delivery at destina- tion in a satisfactory condition at the lowest applicable rate. Containers, packing, or method of shipment shall comply with Uniform Freight Classification Rules or National Motor Freight Classification Rules or other carrier rules as applicable to the mode of transportation
44、. 5.3 Markihg. In addition to any special marking required (see 6.2.1), shipping containers shall be marked in accordance with MIL-STD-129. 6. NOTES 6.1 Intended use. The acoustic absorptive board covered by this specifi- cation is intended for-reduction of sound in spaces, such as machinery spaces,
45、 where there is a high level of noise. 6.2 Ordering data. 6.2.1 Acquisition requirements. Acquisition documents should specify the following: . i Title, number, and date of this specification. First article.sample, when required (see 3.1). Noncombustible or fire-retardant waffle layer (see 3.2.2). W
46、idth and length required, if other than 24 by 36 inches Thickness required (see 3.4.2). Quality conformance inspection reports required (see 4.2.2). Levels of packing required (see 5.2). Special marking required (see 5.3). board (see 3.4.1). 6.2.2 Data requirements. When this specification is used i
47、n an acquisi- tion which incorporates a DD Form 1423, Contract Data Requirements List (CDRL), the data requirements identified below shall be developed as specified by an . approved Data Item Description (DD Form 1664) and delivered in accordance with the approved CDRL incorporated into the contract
48、. When the provisions of 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DAR 7-104.9 (n)(2) are invoked and the DD Form 1423 is not used, the data speci- fied below shall be delivered by the contractor in accordance with the contract or purchase or
49、der requirements, Deliverable data required by this specification is cited in the following paragraphs. Paragraph no . Data requirements title Applicable DID no. Option 3.2 Certificate of compliance m DI-E-2 12 1 10.1 3.2.2 Certificate of compliance DI-E-2121 10.1 3.5 Certificate of compliance DI-E-2 12 1 10.1 4.2.2 Certificate of compliance DI-E-2 12 1 10.1 4.2.3 Reports, test DI-T-2072 10.1 .a (Data item descriptions related to this specification, and identified in section 6 wi
