1、l I I I l I I I 0 I I I .- I 3 : 1 I l l l MIL-P- 18066C 31 July 1985 SUPERSEDING MIL-P-18066B 14 May 1965 (See 6.5) . MI LITARY SPEC IF I CATI ON PLYWOOD, SHIP AND BOAT CONSTRUCTION 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 three classes of plywood for ship and boat building and special applications. 1.2 Classification. Plywood shall be of the following classes, as specified (see 6.2.1) : Class 1 - Douglas fir. Class 2 - .Mahogany. Class 3 - Overlaid Douglas fir (medium density overlay bot
3、h faces). 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specification and standards. Unless otherwise specified, the following specification and standards of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) specified in the solicita
4、tion form a part of this specification to the extent specified herein. SPECIFICATION MILITARY MIL-1-45208 - Inspection System Requirements. FEDERAL QQ-S-781 - Strapping, Steel, and Seals, Beneficial comments (recommendations, additions, deletions) and any pertinent data.which may be of use in improv
5、ing this-document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department sf the Navy, Washington, DC20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC 5530 DISTRIBUTIO
6、N STATEMENT A Approved for public release; distribution unlimited T THIS DOCUMENT -CONTAINS -X-IA- PAGES Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-lbbC 55 9994906 02L2rlb3Tm- MIL-P-18066C STANDARDS MILITARY MIL-STD-105 - Sampling Procedur
7、es and Tables for Inspection by MIL-STD-129 - Marking for Shipment and Storage. Attributes. 2.1.2 Other Government documents. The following other Government document forms a part of this specification to the extent specified herein. NATIONAL BUREAU OF STANDARDS PS-1 - Construction and Industrial Ply
8、wood (Copies of specifications, standards and publications 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 this The is
9、sues of the documents specification to the extent specified herein. which are indicated as DoD adopted shall be the issue listed in the current DoDfSS and the supplement thereto, if applicable. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) D 3043 - Standard Methods of Testing Plywood in Flexure.
10、 O (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) HARDWOOD PLYWOOD MANUFACTURERS ASSOCIATION ANSI/HPMA HP 1983 - American National Standard for Hardwood and Decorative Plywood. (Application for copies should b
11、e addressed to Hardwood Plywood Manufac- turers Association, 1825 Michael Faraday Drive, P.O. Box 2789, Reston, VA 22090-2789,) (Industry association specifications and standards are generally available They are also distributed among technical groups for reference from libraries. and using Federal
12、agencies.) 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 specifi- cation shall.take precedence. 3. REQUIREMENTS 3.1 General requirements. The requirements specified in 3.1.1 through 3.1.13 shall apply to
13、 all classes of plywood (see 1.2). applicable to individual classes of plywood shall be as specified in 3.2. Additional requirements 3.1.1 Construction. Plywood shall be constructed with an odd number of O veneers or plies, All plies, except the core or center ply, shall occur in pairs. The two ples
14、 of each pair shall be of the same thickness and direction 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-18066C MIL-P-LOhhC 55 W 777770b 0232464 O W - of grain, and shall be placed on opposite sides of the core. plies shall be at right angl
15、es to the grain of adjacent plies. The general grain direction of the face veneers, shall be parallel to the length of the panel (see figure 1). Face plies of rotary cut veneer shall be bonded tight side out. and tight side are defined in ANSI/HPMA HP 1983). Veneer shall be tight, smoothly cut and u
16、niform in thickness. ness. 40 to 60 percent of panel thickness, except on 3-ply constructions, The grain of all Face plies of sliced or sawn veneer may be book-matched (book-matched Veneers within a ply shall be of the same thick- The thickness of plies with grain direction parallel to faces shall t
17、otal 3.1.2 Bonding. The assembled veneers, panel scarf joints, panel repairs and overlays, shall be bonded under heat and pressure with synthetic resin glue of the phenol or resorcinol type. 3.1.3 End-grain joints. Butted or scarfed end-grain joints shall not be permitted in any ply. 3.1.4 Edge-grai
18、n joints. When the faces or any ply running parallel with the faces consist of two or more pieces of veneer, the edges shall be joined straight, square and tight, and shall be adhesive bonded prior to panel pressing. When the cross band veneers consist of two or more pieces of veneer, the edges shal
19、l be jointed straight and square without overlapping. Staples or tape which will be retained in the trimmed panel shall not be used to join veneers. veneers during edge gluing or pressing. Tape or staples may be used in trim zones for temporarily holding 3.1.5 Gaps and splits in cross bands. No putt
20、y, fillers, wood plugs, slivers or other concealment of gaps and splits in panels shall be used. Layup of plies shall be tight and ply quality shaIl be such that gaps or splits shall not exceed, after pressing and trimming, 1/4 inch combined total width, 1/8 inch maximum individual width or a total
21、of four in number per cross band ply edge per 8 feet of panel length. Gaps and splits exceeding 1/16 inch shall not be superimposed within 1/2 inch. 3.1.6 Moisture content. The moisture content of the finished plywood at the time of shipment from the producers mill or as acquisitioned from a local d
22、istributor shall be not less than 5 percent nor more than 15 percent, and the difference between face and center plies shall not exceed 2 percent when tested as specified in 4.3.4. not vary more than 2 percent throughout the length and thickness of the panel. The moisture shall be uniformly distribu
23、ted and shall 3.1.7 Panel scarf joints. Plywood panels longer than 96 inches or wider Panel than 60 inches may be made from two or more smaller panels by scarfing. scarf joints shall not have a slope steeper than 1 in 8. When the terms “faces“, “face ply“ and “face veneers“ are used, face and back v
24、eneers are implied. i 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PiLObbC 55-1 999970b 02L2qb5 2 1 MIL-P-18066C 3.1.7.1 Scarf joint quality. When tested as specified in 4.3.5, average joint efficiency for panels shall be not less than 70 pe
25、rcent with no individual panel lesa than 60 percent. 3.1.8 Dimensional tolerance. Trimmed panels shall be within the dimen- sional, squareneas and straightness tolerances shown in table I. TABLE I. Panel dimensional, squareness and straightness tolerances measured to nearest 1/32 inch. Width Length
26、12 feet and under Over 12 feet Thickness Squ ar en es s Straightness of edge or end Inches 4-1/32, -1/16 kl/ 16 +1/8, -1/16 See 3.2.5 Measured at each end of panel: panels less than 4 feet in length or width shall be square within 1/16 inch. Panels 4 feet or greater in length or width shall be squar
27、e within 1/64 inch per linear foot Any point along an edge or end shall be within 1/16 inch of a straight line between any two adj acent corners, 3.1.9 Marking, Each plywood panel shall be marked on the edges or ends with manufacturers name or trademark, the number of this specification (with amendm
28、ent, if applicable) and the class of plywood (see 1.2). 3.1.10 Storage. 3.1.11 Boil shear resistance. The plywood shall develop an average wood failure of not: less than 75 percent and no more than 1/10 of the values obtained shall fall below 50 percent wood failre for each panel tested as specified
29、 in 4.3.1. Plywood shall be stored under cover at all times. 3.1.12 Dry shear strength. The plywood shall develop an average shear strength of not less than 180 pounds per square inch (lb/in2) for each panel tested as specified in 4.3.2. - 3.1.16 Heat durability and delamination resistance. When tes
30、ted as speci- fied in 4.3.3 the plywood shall show no glueline delamination due to combustion or heat. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-O e Plywood class included 1 MIL-P-18066C Commercial designation Coastal Douglas fir 3.2 Individu
31、al classes of plywood. In addition to the requirements specified in 3.1, the following requirements apply to the individual classes of plywood covered by this specification: 3 3.2.1 Species. Plywood may be of any species in table II for the class indicated. specified (see 6.2.1), the shipment may co
32、ntain one or more of the class species. Plies of each panel shall be of the same species. Unless otherwise Philippine mahogany (dark red lauan species) Same as class 1 TABLE II. Species. 2 Wes tern larch I American, Honduras, or Central Amer i c an mahogany African mahogany Common name Douglas fir W
33、est ern larch Mahogany Khaya Tangile Red lauan Tiaong Scient if ic name Pseudotsuga menziesii Lar ix occidentalis Swietienia macrophy 1 la or S. mahagoni Khaya K. anthotheca K. senegalensis K. -grandifolia ivorens is Shorea polysperma , S. negrosensis S. teysmaniana Origin Western United States and
34、Canada (western half of California, Oregon, Washington and British Columbia) Idaho, Montana, eastern Washington Mexico, West Indies, Central America, South America West Africa Philippine Islands 3.2.2 Heartwood. Veneers, patches and repairs shall be heartwood only (see 4.3.6). sapwood when specified
35、 (see 6.1.1 and 6.2.1). Panels to be pressure-treated with preservative may permit 5 .- .:pl:y2: .:.:, :. . /II/ . . _. (a) 3-ply Specimen (b) 5-ply Specimen NOTE: Orient grain direction across specimen to test inner two joints. SH 12954 FIGURE 3. Test specimen. SH 111 FIGURE 4. Jaws for shear test.
36、 ,- I 19 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2 i * rial am VIM Ei! W 8 U U cd a 3 e* mw u0 fi rlh 04 a afi rlcd d2 mu U do drl Rlk fia %k QIn dk .“z 0 N 0 m 20 Provided by IHSNot for ResaleNo reproduction or networking permitted without l
37、icense from IHS-,-,-MIL-P-LObbC 55 7777706 0232482 MIL-P-18066C Frl w PI I& O 21 N m d - al M n %ZW d111 ala al al 111 alUd rl&WPl Brl id (d fG“$ Mal0 rlkua M al alau kala o. ldd o . hl 111 111 al Md ala I-lu cr) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
