1、AEROSPACE MATERIAL SPECIFICATION AMS3940 REV. H Issued 1947-07 Revised 1993-07 Reaffirmed 2014-08 Superseding AMS3940G Fiberboard, Hard-Pressed, StructuralRATIONALE AMS3940H has been reaffirmed to comply with the SAE five year review policy. _ SAE Technical Standards Board Rules provide that: “This
2、report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews
3、 each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2014 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system
4、 or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesa
5、e.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS3940H 1. SCOPE:1.1 Form: This specification covers hard-pressed fiberboard in the form of flat panels.1.2 Application: This fiberboard h
6、as been used typically for parts requiring moderate strength, such as paneling and sheathing of shipping containers, but usage is not limited to such applications.1.3 Safety-Hazardous Materials: While the materials, methods, applications, and processes described or referenced in this specification m
7、ay involve the use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure
8、 the health and safety of all personnel involved. 2. APPLICABLE DOCUMENTS: The following publications form a part of this specification to the extent specified herein. The applicable issue of referenced publications shall be the issue in effect on the date of the purchase order.2.1 ASTM Publications
9、: Available from ASTM, 1916 Race Street, Philadelphia, PA 19103-1187.ASTM D 1037 Evaluating the Properties of Wood-Base Fiber and Particle Panel MaterialsSAE INTERNATIONAL AMS3940H Page 2 of 8 2.2 U.S. Government Publications: Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbi
10、ns Avenue, Philadelphia, PA 19111-5094.MIL-W-3448 Wallboard, Packaging of3. TECHNICAL REQUIREMENTS: 3.1 Material and Fabrication: The product shall consist of wood fibers physically or chemically separated, felted, and heavily compressed to produce the properties specified in 3.2, using the natural
11、wood lignins or other suitable adhesive as a bonding agent, in accordance with the following:3.1.1 Wood Species: Shall be one or a combination of the following:SpruceCottonwoodFirWillowPoplarPineGumwoodRedwoodAspenDouglas Fir3.1.2 Laminating: Panels 5/16 inch (7.9 mm) and under in nominal thickness
12、shall be one solid sheet. Panels over 5/16 inch (7.9 mm) in nominal thickness shall be laminated from thinner sheets. Panels 1/4 inch (6.4 mm) and over in nominal thickness and requiring both faces smooth may be laminated from thinner sheets. Bonding of laminated panels shall be accomplished with a
13、thermosetting synthetic resin glue resistant to formation and growth of molds and fungi.3.1.3 Chemical Treatment: Panels may be chemically treated to improve strength and abrasion resistance and to reduce moisture absorption.3.2 Properties: Fiberboard shall conform to the following requirements, det
14、ermined in accordance with ASTM D 1037, Part B, and, except for density, shall be reported as the average of all values for each test:3.2.1 Density: Shall be not lower than 31 pounds per cubic foot (497 kg/m3).SAE INTERNATIONAL AMS3940H Page 3 of 8 3.2.2 Tensile Strength: 3.2.2.1 Parallel to Surface
15、: Shall be not lower than 3500 psi (24.1 MPa); strength shall be approximately equal in all surface directions.3.2.2.2 Perpendicular to Surface: Shall be not lower than 150 psi (1.03 MPa).3.2.3 Modulus of Rupture: Shall be not lower than 7000 psi (48.3 MPa).3.2.4 Water Resistance: 3.2.4.1 Water Abso
16、rption: Shall be not greater than the percentages by weight shown in Table 1 as applicable to the surface finish specified.3.2.4.2 Thickness Swelling: Shall be not greater than the percentages shown in Table 2 as applicable to the surface finish specified.TABLE 1 - Water AbsorptionNominalThicknessIn
17、chNominalThicknessMillimetersAbsorption% by WeightSmoothOne Side (SIS)Absorption% by WeightSmoothBoth Sides (S2S)1/12 2.1 30 -1/10 2.5 20 251/8 3.2 15 203/16 4.8 12 181/4 6.4 10 125/16 7.9 8 113/8 9.5 8 10SAE INTERNATIONAL AMS3940H Page 4 of 8 3.2.4.3 Water resistance requirements for fiberboard ove
18、r 3/8 inch (9.5 mm) in nominal thickness shall be as agreed upon by purchaser and vendor.3.3 Workability: Fiberboard shall not crack, split, chip, or delaminate when drilled, sawed, or nailed perpendicularly to the surface.3.4 Quality: Fiberboard, as received by purchaser, shall be sound and free fr
19、om foreign materials and from imperfections detrimental to usage of the fiberboard. Panels shall be flat and shall have at least one face smooth; laminated panels shall be smooth on both surfaces.3.5 Tolerances: Shall be as follows:3.5.1 Thickness: Shall be specified in Table 3, measured in accordan
20、ce with ASTM D 1037.TABLE 2 - Thickness SwellingNominalThicknessInchNominalThicknessMillimetersThicknessIncrease, % SmoothOne Side (SIS)ThicknessIncrease, %SmoothBoth Sides (S2S)1/12 2.1 25 -1/10 2.5 16 201/8 3.2 11 163/16 4.8 10 151/4 6.4 8 115/16 7.9 8 103/8 9.5 8 9SAE INTERNATIONAL AMS3940H Page
21、5 of 8 TABLE 3A - Thickness Tolerances, Inch/Pound UnitsNominal ThicknessInchesActual ThicknessInches1/12 0.070 to 0.0901/10 0.091 to 0.1001/8 0.115 to 0.1553/16 0.165 to 0.2051/4 0.210 to 0.2655/16 0.290 to 0.3353/8 0.350 to 0.4007/16 0.410 to 0.4601/2 0.475 to 0.5255/8 0.600 to 0.65011/16 0.660 to
22、 0.7103/4 0.725 to 0.77513/16 0.785 to 0.8357/8 0.850 to 0.9001 0.975 to 1.0251- 1/8 1.115 to 1.155TABLE 3B - Thickness Tolerances, SI UnitsNominal ThicknessMillimetersActual ThicknessMillimeters2.1 1.78 to 2.292.5 2.31 to 2.543.2 2.92 to 3.944.8 4.19 to 5.216.4 5.33 to 6.737.9 7.37 to 8.519.5 8.89
23、to 10.1611.1 10.41 to 11.6812.7 12.06 to 13.3415.9 15.24 to 16.5117.5 16.76 to 18.0319.0 18.42 to 19.6820.6 19.94 to 21.2122.2 21.59 to 22.8625.4 24.76 to 26.0428.6 28.32 to 29.34SAE INTERNATIONAL AMS3940H Page 6 of 8 3.5.2 Length and Width: Nominal length shall be as ordered and nominal width shall
24、 be 4 feet (1.22 m) or 5 feet (1.52 m), as ordered. Tolerance on length and width shall be 1/64 inch per foot (1.3 mm/m) of linear dimension.3.5.3 Squareness: The difference in lengths of the two face diagonals of a panel shall be not greater than 1/64 inch per foot (1.3 mm/m) of length of panel. Op
25、posite edges of panels shall not vary more than 1/8 inch (3.2 mm) in length.3.5.4 Edge Straightness: Edges of panels shall be straight within 1/16 inch per foot (5.2 mm/m) of length or width, determined by stretching a string or wire from one corner to the adjacent corner and measuring the greatest
26、distance between the string or wire and the panel edge being tested.4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: The vendor of fiberboard shall supply all samples for vendors tests and shall be responsible for performing all required tests. Purchaser reserves the right to samp
27、le and to perform any confirmatory testing deemed necessary to ensure that the fiberboard conforms to the requirements of this specification.4.2 Classification of Tests: 4.2.1 Acceptance Tests: Tests for material and fabrication (3.1), tensile strength (3.2.2), water resistance (3.2.4), quality (3.4
28、), and tolerances (3.4) are acceptance tests and shall be performed on each lot.4.2.2 Preproduction Tests: Tests for all technical requirements are preproduction tests and shall be performed prior to or on the first-article shipment of fiberboard to a purchaser, when a change in ingredients and/or p
29、rocessing requires reapproval as in 4.4.2, and when purchaser deems confirmatory testing to be required.4.2.2.1 For direct U.S. Military procurement, substantiating test data and, when requested, preproduction test material shall be submitted to the cognizant agency as directed by the procuring acti
30、vity, contracting officer, or request for procurement.4.3 Sampling and Testing: Shall be as follows; a lot shall be all panels of one size manufactured in one continuous production run and presented for vendors inspection at one time.4.3.1 For Acceptance Tests: In accordance with ASTM D 1037.4.3.2 F
31、or Preproduction Tests: As agreed upon by purchaser and vendor.SAE INTERNATIONAL AMS3940H Page 7 of 8 4.4 Approval: 4.4.1 Sample fiberboard shall be approved by purchaser before fiberboard for production use is supplied, unless such approval be waived by purchaser. Results of tests on production fib
32、erboard shall be essentially equivalent to those on the approved sample.4.4.2 Vendor shall use ingredients, manufacturing procedures, processes, and methods of inspection on production fiberboard which are essentially the same as those used on the approved sample. If necessary to make any change in
33、ingredients, in type of equipment for processing, or in manufacturing procedures, vendor shall submit for reapproval a statement of the proposed changes in ingredients and/or processing and, when requested, sample fiberboard. Production fiberboard made by the revised procedure shall not be shipped p
34、rior to receipt of reapproval.4.5 Reports: The vendor of fiberboard shall furnish with each shipment a report showing the results of tests to determine conformance to the acceptance test requirements and stating that the fiberboard conforms to the other technical requirements. This report shall incl
35、ude the purchase order number, lot number, ASM 3940H, vendors material designation, size, and quantity.4.6 Resampling and Retesting: If any specimen used in the above tests fails to meet the specified requirements, disposition of the fiberboard may be based on the results of testing three additional
36、 specimens for each original nonconforming specimen. Failure of any retest specimen to meet the specified requirements shall be cause for rejection of the fiberboard represented. Results of all tests shall be reported.5. PREPARATION FOR DELIVERY: 5.1 Identification: Each panel shall be legibly marke
37、d on one face with not less than AMS 3940H and the manufacturers identification. The characters shall be applied using a suitable marking fluid which will not be obliterated by normal handling. Alternatively, the information may appear on a suitable adhesive label affixed to each panel.5.2 Packaging
38、: 5.2.1 A lot of fiberboard may be packaged in small quantities and delivered under the basic lot approval provided lot identification is maintained.5.2.2 Fiberboard shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations pertaini
39、ng to the handling, packaging, and transportation of the fiberboard to ensure carrier acceptance and safe delivery.SAE INTERNATIONAL AMS3940H Page 8 of 8 5.2.3 For direct U.S. Military procurement, packaging shall be in accordance with MIL-W-3448, Commercial Level, unless Level A is specified in the
40、 request for procurement. 6. ACKNOWLEDGMENT: A vendor shall mention this specification number and its revision letter in all quotations and when acknowledging purchase orders.7. REJECTIONS: Fiberboard not conforming to this specification, or to modifications authorized by purchaser, will be subject
41、to rejection.8. NOTES: 8.1 The change bar ( l ) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this specification. An (R) symbol to the left of the document title indicates a co
42、mplete revision of the specification.8.2 Dimensions and properties in inch/pound units are primary; dimensions and properties in SI units are shown as the approximate equivalents of the primary units and are presented only for information.8.3 For direct U.S. Military procurement, purchase documents
43、should specify not less than the following:Title, number, and date of this specificationSize of panels desiredQuantity of panels desiredWhether panels are to be smooth on one side or both sidesLevel A packaging, if required (See 5.2.3).8.4 Fiberboard meeting the requirements of this specification has been classified under Federal Supply Classification (FSC) 5640.PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE “P“
