NAVY MIL-I-24330-1968 INSULATION SHEET ELECTRICAL LIGNO-CELLULOSIC HIGH DENSITY HARDBOARD《带电高密度木质纤维硬板绝缘薄片》.pdf

《NAVY MIL-I-24330-1968 INSULATION SHEET ELECTRICAL LIGNO-CELLULOSIC HIGH DENSITY HARDBOARD《带电高密度木质纤维硬板绝缘薄片》.pdf》由会员分享，可在线阅读，更多相关《NAVY MIL-I-24330-1968 INSULATION SHEET ELECTRICAL LIGNO-CELLULOSIC HIGH DENSITY HARDBOARD《带电高密度木质纤维硬板绝缘薄片》.pdf（7页珍藏版）》请在麦多课文档分享上搜索。

1、MILITARY SPECIFICATION INSULATION SHEETS, ELECTRICAL, LIGNO-CELLULOSIC, HIGH DENSITY, HARDBOARD 1. SCOPE 1.1 This specification covers fiberistic, ligno-cellulosic high density, laminated 2. APPLICABLE DOCUMENTS 2.1 sheet materials. The following documents of the issue in effect on date of invitatio

2、n for bids or request for proposal, form a part of the specification to the extent specified herein: SPECIFICATIONS FEDERAL PPP-B-636 - Box, Fiberboard. PPP-B-1055 - Barrier Material, Waterproofed, Flexible. MIL-B-43291 - Box, Fiberboard, Corrugated, Double-Wall, Weather Resistant. MILITARY STANDARD

3、S MI LI TARY MIL-STD-105 - Sampling Procedures and Tables for Inspection By Attributes. MIL-STD-129 - Marking-For Shipment and Storage. (Copies of specifications, standards, drawings, and publications required by suppliers in connection with specific procurement functions should be obtained from the

4、 procuring activity or as directed by the contracting officer.) the extent specified herein. invitation for bids or request for proposal shall apply. Uniform Freight Classification Rules. 2.2 Other publications. The following documents form a part of this specification to Unless otherwise indicated,

5、 the issue in effect on date of UNI FORM CLASSIFI CATION. COMMITTEE (Application for copies should be addressed to the Uniform Classification Committee, 202 Union Station, 516 West Jackson Boulevard, Chicago, Illinois 60606,) AMERICAN TRUCKING ASSOCIATIONS, INC. (Application for copies should be add

6、ressed to the American Trucking Associations, Inc.: AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) National Motor Freight Classification Rules. 1616 P Street, N. W., Washington, D. C. 20036.) D-229 - Testing Rigid Sheet and Plate Materials Used For Electronic Insulation. D-635 - Test For Flammabi

7、lity of Rigid Plastics Over 0,127 cm. (0.050 in.) In D-952 - Test For Bond Strength of Plastics and Electrical Insulating Materials. D-1037 - Evaluating the Properties of Wood-Base Fiber and Particle Panel Products, Thickness. (Application for copies should be addressed to the American Society for T

8、esting and (Technical society and technical association specifications and standards are generally Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103.) available for reference from libraries. and using Federal agencies.) They are also distributed among technical groups Provided by IHSNot

9、for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-Z4330(SHIPS) 3, REQUIREMENTS 3.1 First article sample. Prior to beginning production, a sample shall be tested as specified in 4.2 (see 6.3). 3.2 Material. 3.2.1 Construction. The material shall consist of interfelt

10、ed, ligno-cellulosic fibers consolidated under heat and pressure. to the desired thickness. table III, be averaged before comparison with the applicable table. Two or more individual sheets may be laminated 3.2.2 Propert values. The material shall conform to the property values shown in The valEes o

11、btained for each set of specimens taken from the same sheet shall 3.2.3 Conditioning of samples. Samples for first article and conformance testing shall be conitioned, as described in 3.2.3.1 through 3.2.3.4 for the tests listed in tables 111 and IV. 3.2.3.1 3.2.3.2 3.2.3.3 Samples shall be tested i

12、n the condition received. Samples shall be subjected to conditions as outlined in the applicable test Samples shall be subjected to 90 Fahrenheit - 90 percent relative humidity Surfaces shall be wiped dry and tests commenced within 30 procedure. for 96 hours prior to testing. minutes after removal f

13、rom conditioning environment. for 96 hours prior to testing. aiinutes after removal from conditioning environment. 3.2.3.4 Samples shall be subjected to a 90 Fahrenheit - 90 percent relative humidity Surfaces shall be wiped dry and tests commenced within 30 3.2.4 Uniformit Both surfaces of all sheet

14、s of any lot shall be smooth, uniform in texture, TinTcTlanf; color. 3.2.5 Surface defects. The material shall be free from internal and external blisters. delamination or cracKs, and reasonably free from other small defects such as scratches, dents, or heat marks. 3.2.6 Warp or twist, (Applicable o

15、nly to uncut sheets as received from manufacturer.) The warp or twist of material as delivered, shall not exceed the values of table I. Table I - Warp or twist. Thickness - - - I Maximum permissible warp or Inch 1/8 to 1/4 3/8 to 3/4 Over 3/4 Twist L/ (on basis of 36 inch Percentage 1.0 0.5 0.25 dim

16、ens ion) -In case of warp, this percentage is stated in terms of the lateral dimensions (length or width); in the case of twist, the percentage is stated in terms of the dimension from.one corner to the diagonally opposite corner. 2 Provided by IHSNot for ResaleNo reproduction or networking permitte

17、d without license from IHS-,-,-MIL-1-24330 57 777770b 0030057 B W - A 3. 3 Dimensions and tolerances. 3.3.1 Length and width. Unless otherwise specified by the procuring activity, the manufacturerfs standard sizes of 48 inches in width and between 36 and 144 inches in length will be acceptable. The

18、length and width of sheets may vary 1 inch over or under the manufacturers standard size. Non-uniform standard sheet dimensions caused by cutting specimens for tests required by this specification shall not be cause or rejection, unless particular sheet dimensions are specified (see 6.2). 3.3.2 Thic

19、kness. Sheets shall be furnished in the nominal thickness shown in table II, as speciPied (see 6.2). At least 90 percent of the area of the panel shall be within the tolerance range given. At no point shall the thickness vary more than one-eighth of the range below the minimum or above the maximum.

20、Table II - Thickness. Nominal thickness Decimal Permissible variation equivalent Inches in inches Minimum Maximum i/ 8 1/4 3/ 8 1/2 5/ 8 3/ 4 1 1-1/4 1-1/2 2 O. 125 1 0.250 0.375 0.500 0.625 O. 750 1.000 1.250 1.500 2.000 0.125 0.155 O. 238 O. 262 0.358 0.392 0.479 0.521 0.601 O .649 O. 723 O, 777 0

21、.967 1.033 1.213 1.287 1.459 1.541 1.951 2.049 3.4 Color. The material shall be furnished.natura1 in color which is the color 3.5 Machineability. The material shall be such that it can be drilled, tapped, sawed, naturally attained in the manufacturing process without the addition of any colorants, a

22、nd machined in all directions 1 without cracking, splitting, or otherwise impairing the material for general use. finish of the sheets shall be semi-gloss on both faces as produced by the laminating process. and workma-r, and shall be free from defects, other than with respect to color (see 3.4), wh

23、ich may affect the appearance or serviceability. 3.6 Surface finish. Unless otherwise specified by the procuring activity, the surface 3.7 Workmanshi . Laminated materials shall be manufactured and processed in a careful 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless other

24、wise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection require- ments as specified herein. Except as otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the ins

25、pection requirements specified herein, unless disapproved by the Government. The Govern- . ment reserves the right to perform any of the inspections set forth in the specification where such inspectigns are deemed necessary to assure supplies and services conform to pre- scribed requirements. nation

26、 and tests specified in table III. First article tests shall be conducted at a laboratory satisfactory to the Nava1 Ship Engineering Center, Materials Development and Applications Office, Department of the Navy, Washington, D. C. 20360. 4.2 First article inspection. First article inspection shall co

27、nsist of the exami- LThe nature of laminated material necessitates special precautions when drilling and tapping parallel to laminations. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking per

28、mitted without license from IHS-,-,-Characteristic Conditioning Test Procedure Caliper 3.2.3.1 3.3.2 Warp or Twist 3.2.3.1 3.2.6 Specific Gravity 3.2.3.1 ASTM D-1037 1/8 in. 1/4, 3/8, and i/2 in. 3/4 in. and Over Modulus of Rupture 3.2.3.1 ASTM D-1037 1/8 in. 1/4 in. and Over * Bond Strength 3.2.3.1

29、 ASTM D-952 Water Absorption-24 Hr. 3.2.3.1 ASTM D-1037 1/8 in. 1/4 and 3/8 in. 1/2 in. 5/8 and 3/4 in. 1 in. and Over (- Unit of value Requirement Pass or Failure Pass Pass or Failure Pass Minimum 1.15 Maximum 1.30 Minimum 1.28 Maximum 1.43 Mi n imum 1.35 Maximum 1.50 - Psi Minimum 10,000 Psi Minim

30、um 9,000 U in imum 350 Percent Max. 8.0 Percent Max. 2.5 Percent Max. 2.0 Percent Max. 1.5 Percent Max. 1.0 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL- I - 24 330 (SHIPS) 5. PREPARATION FOR DELIVERY (The preparation for delivery requirements

31、 specified herein apply only for direct Government procurements. listed in Section 2 do not apply unless specifically stated in the contract or order, paration for delivery requirements for products procured by contractors shall be specified in the individual order.) Preparation for delivery require

32、ments of referenced documents Pre- 5.1 5.1.1 Packa in . Packaging shall be sufficient to afford protection against deterio- Domestic shipment and immediate use. ration and pdamage during shipment from the supply source to the first receiving activity for immediate use. by common carrier, at the lowe

33、st rate, and will afford protection against physical damage during direct shipment from the supply source to the first receiving activity for immediate use. The shipping containers or method of packing shall conform to the Uniform Freight Classification or National Motor Freight Classification Rules

34、 and Regulations .or other carrier regulations as applicable to the mode of transportation and may conform to the suppliers commercial practice. 5.1.2 Packing. Packing shall be accomplished in a manner which will insure acceptance 5.1.3 Marking. Shipment marking information shall be in accordance wi

35、th MIL-STD-129. 5.2 Domestic shipment and storage or overseas shipment. The levels of packaging, packing, and marking for shipment shall be specified by the procuring activity (see 6.2). 5.2.1 Packaging. 5.2.1.1 Level A. Sheets shall be wrapped individually, or interleaved with a non- 5.2.1.2 Level

36、C. bleeding, barrier material conforming to PPP-B-1055. deterioration and physical damage during shipment from the supply source to the first receiving activity for immediate use. Packaging shall be sufficient to accord adequate protection against 5.2.2 Packing. 5.2.2.1 Level A. Sheets, packaged as

37、specified (see 6.2), shall be packed in con- tainers conforming to class weather-resistant of PPP-B-636 or MIL-B-43291. All center and edge seams and manufacturers joints of the container shall be sealed and waterproofed with pressure sensitive tape and container reinforcing shall be accomplished by

38、 use of reinforced, pressure-sensitive tape in accordance with the appendix to the applicable box specification. Container gross weight shall not exceed the weight limitations of the applicable box speci- fications. tainers conforming to class domestic of PPP-B-636. accordance with the box specifica

39、tion or appendix thereto. exceed the weight limitations of PPP-B-636. 5.2.2.2 Level B. Sheets, packaged as specified (see 6.2), shall be packed in con- Shipping cmtainers shall be closed in Fiberboard boxes shell not 5.2.2.3 Level C. Sheets, packaged as specified (see 6.2), shall be packed in contai

40、ners, atthelowest rates, in a manner which will insure acceptance by common carrier and will afford protection against physical or mechanical damage during direct shipment from the supply source ta the first receiving activity for immediate use. This level in general shall conform to the Uniform Fre

41、ight Classification Rules, National Motor Freight Classification Rules or other carrier regulations as applicable to the mode of transpor- tation and may be the suppliers commercial practice when such meets the requirements of this level. 5.2.3 !arking. In addition to any special marking required by

42、 the contract or order, interior pac ages and exterior shipping containers shall be marked for shipment in accord- ance with MIL-STD-129. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_- :I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-