1、MIL-I-BB35A bb W 9799906 OL2698Lt L m f=xw-a / MIL-I-8835A 8 MIL-1-8835 10 March 1959 t t MILITARY SPECIFICATION INDICATOR, HUMIDITY, CARD, CHEMICALLY IMPREGNATED Th! s specification is apprved for use by al 1 Departments and Agencies of the Department of Defense. 1 . SCOPE ,5 .I establishes the req
2、uirements for one type humidity sensitive, indicator card designed for use of items in accordance with Method II of 2.1 Godernme6 t documents. 2.1.1 ipecifications and standards. Unless otherwisespecified, .the following jpecificatioos and standards of the issue listed in that issue of the .Departfi
3、ent OF Defepse Index of Specifications and Standards (DoDISS) . .specified 1.n the sol-icitation form a part of this specification to the extent specified herein. SPECIFICATIONS FEDERAL * PPP-C-96 - Can, Metal, 28 Gage and Lighter , , MILITARY MIL-P-116 - Preservatjon, Methods of MIL-D-3464 - Desicc
4、ants, Activated, Bagged, Packaging Use and Static Dehumidification Beneficial comments (recommendations, additions, deletions) which may be of use in improving this document should be Engineering and Standardization Dep.artment (Code 931, Naval Air Engineering Center, Lakehurst, NJ 08733, by using t
5、he self-addressed Standardization Document Improve- ment Proposal (DD Form 1426) appearing at the end of this document or b letter. - r r: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-B835A 66 9999906 0326985 3 , MIL-I-8835A STANDARDS MILITA
6、RY t MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes MIL-STD-129 - Marking for Shipment and Storage * MS20003 - Indicator, Humidity, Card, Three Spot, Impregnated Areas (Cobaltous Chloride) (Copies of specifications and standards required by manufacturers in connectidn with
7、 specific acquisition functions should be obtained from the contracttng activity or as directed by the contracting officer.) 2.2 dther publications. The following documents form a part of this specificdtion to the extent specified herein. The issues of the documents . which ar indidated as DOD adopt
8、ed shall be the issue listed in the current DoDISS- aqd the-supplement the.reto, if applicable. American Sotiety for Testing and Materials ASTfi D 2167 - Ink Absorption of Blotting Paper ASTG D 3941 - Commercial Packaging $ t C (Applitatiorjs for copies shouldbe addressed to the American Society for
9、- 2.3 OYder cxf precedince, In the event of a conflict between the text of Testing ahd Materials, 1916 Race Street, Philadelphia, PA 19103.) Q this spec-ificat-ion and the references cited herein, the text of this spec.-f ication shall take precedence. 3. REQUIREMENTS 3.1 First article When specifie
10、d, a sample shall be subjected to first article inspection (see 4.4 and 6.2.1). 3.2 Material. Humidity indicator cards shall consist of smooth blotting paper impregnated with a chemical soluton which shall changecolor to indicate humid! ty due to $he presence of water-vapor. 3.2.1 Component material
11、s. 3.2.1.1 Blottlng paper. The blotting paper shall be made from fibrous, cellulosic material which may include reclalmed fiber. The blotting paper shall also meet the requirements in Table I. 3.2.1.2 Chemical impregnant. The impregnant shall be a solutlon of chemically pure cobaltous chloride in di
12、stilled water; No addi tive shall be used except for spots manufactured to change color over 50 and under 20 percent relative humidity (R.H.) (see 6.2). The amount and concentratlon of the impregnating solution shall remain the choice of the manufacturer. 2 Provided by IHSNot for ResaleNo reproducti
13、on or networking permitted without license from IHS-,-,-MIL-I-8835A TABLE I. Blotting Paper Requirements. k Property Requirements Test paragraph Col or White 4.6.1 Basis Height (1000 sheets, . 200 2 10 pounds 4.6.2 Ink absorbency Absorption of . 4.6.3 each measuring 19in x 24in) 1 milliliter (ml) of
14、 ink in 50 seconds 9 3,2.1.3 Prfntin ink-. The ink for printing instructions on the card shall 3.3 Design. Unless otherwise specified, the humidity indicator cards 3.4 (and sensi tivi ty of spots. The apparatus shall consist of a mixing chamber and volume of one. cubic foot. In the mixing chamber tw
15、o * stream9 f air, -one saturated and one dry, shall be admitted in proportions necessary to develop the desired relative humidity in the chamber. One stream of air shill be-saturated by bubbling the air throgh distilled water before admission;to th4 mlxlhg chamber. The other stream of air shall be
16、dried by passing te air-through a bed of activated silica gel before admission to the mixing chgmber. Adjustable valves on each of the air lines shallcontrol the proportior$ of dry and saturated air admitted to thP ,chamber. The relative humidity df the air leaving the mlxing bhamber shall be determ
17、ined by means of a calibrated humidity-sensing element and an electric hygrometer or an equivalent. After passing over the humid-ity-sensing element, air of the desired relative humidity shall be passed through the test chamber. The test chamber shall be so constructed as to afford a clear view of t
18、he inside, and of the ind-lcating cards undergoing the test wi thin it, If opaqueor -translucent, the test chamber shall have a sufficientlylarge window to permit observation of the cards inside. 4.8.1.2 Procedure. The samples under test shall be suspended in the test chamber in such a manner as to
19、be visible from the. outslde. Air at a relative humidity of 5 2 1 percent below the relative humidity critical for the indicating spot being tested, and at a temperature. of 73.5 2 2F, shall be admi tted to the test chamber and allowed to pass over the suspended samples for one hour at a rate of 8 0
20、.2 1 i ters per minute. At the end of thi s period the spot under test shall be visually examined for conformance to the ) requirements as specified in 3.4. Evidence of mottling or divergence from the specified blue color shall be cause for rejection. Air at a relative humidity of 5 2 1 percent abov
21、e the relative humidity critcal for the indicating spot Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-8835A ._ under test, and at a temperature of 73.5 2“F, sha1.l then be admitted to the test chamber and allowed to flow over the samples at t
22、he same rate as before for one hour The samples shall then be re-examined for conformance to the requirements as specified. in 3.4, and any mottling or divergence from the sgecified pink color shall be cause for rejection. . 4.8.1.3 Alternate static test method. The following test method may be subs
23、tituted for the dynamic test specified in 4.8.1.2. The samDles under test shall be placed in a static relative humidity atmbsphere of 5 1 percent below the critical relative humidity for the indicating spot (at 73.5 2 2F). The samples shall remain In the static atmosphere for 48 hours. This test sha
24、ll be repeated at a relative humid!ty of 5 + 1 percent above the critical relative humidity. Evidence of any mottl ing 07 color defects shall be cause for rejection. a b 4.8.2 Hfgh and low temperature cyclinq. Place 3 unit containers of humidity indicatihg cards .in a test chamber maintained at a te
25、mperature of i60 2 5F. -The. pptainers shall remain at thi s temperature for 24 hours. The containers sihall %hen bj! removed and placed in a test chamber maintained at -65 2 5F. :After;24 hoprs exposure at this temperature the containers shall betremved 2nd again exkosed at 160 2 5F temperature for
26、 24 houys. This cycling Sexpdsure ts conkinued foi- a total period of 168 hours (4 cycles of high temperciture $xposuie and 3 cycles of low temperature exposure). After final removql frodthe fest chamber the containers shall be allowed to remain at room temeratu$e for2 hours: Four humidity cards sha
27、ll then be removed from each c6ntainer and tested in accordance wlth 4.8.1. , 4.8.3 Stability. Place 10 humidity cards in a desiccator containing a glycerine waiter sQlutioh having aspecific gravity of 1m.184 at 77 2 2F to effect an atisphcfre of -60 2 2 percent relative humidity. The desiccator sha
28、ll be sealed arfd. maijtained at a temperature of 160 t 5F for 7 days 068 hours). After th conditioning period, the cards shall be removed and- tested in accordance wi tti 4.8.1. 5. PACKAG I b specified (she 6.2.). 5.1 Preskrvat 1.0“. Cards shall be preserved Level A or Cornmerclal , as 5.1.1 Color
29、of spots before packaging. The highest indicating spot or the 50 percent relative humidity spot (whichever is lower) must be blue when packaged. conforming to Type V, Class 2 of PPP-C-96. Unless otherwtse specified each can shall contain 125 cards. Deslccant conforming to MIL-D-3464 shall be placed
30、inside the can prior to packaging of the cards. The size and shape of the can shall be selected so that the void of the cans, when fi 1 led wi th the specified number of cards, shall be a minimum and not exceed 5% of the capaci ty of the can. 5.1.2 Level A. Cards shall be preserved without folding i
31、n cans 5.1.3 Commercial. Cards shall be preserved in accordance with ASTM D 3951. 5.2 Packing. Cards shall be packed Level A, Level B or Commerclal, as e specified (see 6.2). 6 “ . “. “ .- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-I-BB35A
32、 66 777770b 0326770 7 MIL-I-8835A 5.2.1 Level A. Cards .,preserved as specffled in 5.1.2 shall be packed in - 8 accordance with the Appendix of PPP-C-96 as specified for overseas shipment. . 5.2.2 Level B. Cards packaged as specifled in 5.1.2 shall be packed in accordance wi th the Append1 x of Spec
33、i f ication PPP-C-96 as speci f led for domestic shipment. 5.2.3 Commercial. The indicators shall be packed in accordance with ASTM D 3951. 5.3 Marking 5.3.1 Unit container. Each unit container shall be durably and legibly marked in accordance with MIL-STD-129 and wlth the following information, in
34、such a manner that the marking wi 11 not become damaged when the containers are opened : SecifikationMIL-I-8835A M- . Part: Number Q with MIL-STD-129. 6. NOTE . 6.1 qntended use. The humidity-indicating cards conforming to this specificition AT Navy - YD Air Force- 82 DLA - GS User Activities: Navy - OS, MC . Preparing Activity: (Project No. 6685-0742) Navy - AS c 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
