ARMY MIL-W-20553D-1976 WAX DESENSITIZING.pdf

1、MIL-W-20553D 71 m 7779706 010285g O m Beneficial comments (recommendations, additions, deletions) * and any pertinent data which may be of use in improving this document should be addressed to: Commander, Picatinny Arsenal, Dover, New Jersey 07801 by using the self-addressed Standard- .ization Docum

2、ent Improvement Plroposal (DD Form 1426) appearing ,at the end of this document or by letter. - MILITARY MIL-W- 20 5 5 3D 17 November i976 SUPERSEDING MIL-W-O0 20 5 53C (PA) 29 July 1974 AND MIL-W-20 553B i8 March i962 SPECIFICATION WAX, DESENSITIZING . This specification is approved for use by all

3、Departments and Agencies of the Department of Defense. 1. SCOPE .? 1.1 Scope.-This specification covers desensitizing waxes for use in cast and pressed explosive compositions (see 6.1). 2. APPLICABLE DOCUMENTS 2.1 Issues of documents.-The following documents, of the issue in effect on date of invita

4、tion for bids. form a Dart of this specification to the extent spec.ified Gerein. - STANDARDS MILITARY I6 I Ift PAGES, e- - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-U-20553D 73 W 777770b 0302855 2 W , MIGW-20553D . t 2.2 Other publications

5、.-The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply. AMl3RICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) D92 - Test for Flash and Fire Points by C

6、leveland Open Cup 127 - Test for Drop Melting Point of Petroleum Wax D445 - Test for Kinematic Viscosity of Transparent and Opaque Liquids 721 - Test for Oil Content of Petroleum Waxes D938 - Congealing Point of Petroleum Waxes, Including Petrolatum 1321 - Test for Needle Penetration of Petroleum Wa

7、xes (Application for copies should be addressed to the American Society for Testing and Materials, i916 Race Street, Phila- delphia, Pennsylvania 19103). AIBRICAN OIL CHEMISTS SOCIETY (A.O.C.S,) * Cc 3 - 25 - Softening Point 3 . REQUIREMENTS n 3.1 Qualification (see 4.3 and 6.4),-The crsensitizing w

8、ax furnished under this specification shall be a product which has passed the applicable qualification tests and has been listed on or approved for listing on the qualified products list (QPL). The desensitizing wax supplied under contract shall conform to the material receiving qualification. In or

9、der to retain qualifi- cation approval of products, the manufacturer must certify that the product listed on the QPL meets the current specification requirements. Any major change in the fingerprint or formu- lation shall necessitate requalification (see 4.3.3, 6.4.3, 6.5 and 6.7) following requirem

10、ents: 3.2 Material.-The material shall be a wax meeting the 3.2.1 Physical and chemical properties.-The desensitizing wax shall conform.to the limits Specified for the properties listed in Table I, when determined as specified in the appli- cable subparagraphs of 4.5. 2 Provided by IHSNot for Resale

11、No reproduction or networking permitted without license from IHS-,-,- MIL-W-20553D 91 W 9999906 0302856 4 W MIL- W- 2 O5 5 3D TABLE I Property Melting Point OF, Min Viscosity Penetration (in units Max (in Centistokes (cSt) at 210OF) (98OC) of 0.lmm) at 77F Min (25OC Min) at llOF Max (43C Max) Flash

12、Point OF Min Organic Insoluble Matter % Max Alkalinity, % Max Acidity, as Acetic Acid, % Max Oil Content % Weight, Max Exudation at 1600 (7iC), % Max (see 6.9) Fingerprint (see 3.1) Requirement Test Paragraph 4.5.1 4.5.2 6 4.5.3 35 400 (204OC) o. 03 None 4.5.4 4.5.5 4.5.6 0.01 4.5.7 2.5 . 4.5.8 3.0

13、See 6.4.3 4.5.9 4.5.10 3.3 First article testing.-This specification makes provision for first article testing. Submission of first article quantity by the contractor shall be as specified in the contract.(see 4.2) 3.4 Reactivity at 100C or 120C.-The reactivity values shall not exceed 1 milliliter (

14、mi), when determined as specified in 4.5.11. (see 6.6). This test is to be performed by a Government laboratory 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection.-Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all insp

15、ection requirements as specified herein. Except as otherwise specified in the contract or order, the supplier may use his own or any other facilities specified herein, unless disapproved by the Government. In addition, the Government reserves the right to perform any of the inspections set forth in

16、the specification where such inspections are deemed necessary to assure supplies and services conform to the pre- cribed requirements. Reference shall be made to MIL-STD-109 to define terms used herein. - 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS

17、-,-,- MIL-W-20553D 71 7977706 0302857 b W MIL- W- 20 5 5 3D 4.1.1 Classification of Inspections.-The inspection require- ments specified herein are classified as follows: a. First Article Inspection (see 4.2) b. Qualification Inspection (see 4.3) c. Quality Conformance Inspection (see 4.4) 4.2 First

18、. Article Inspection 4.2.1 Submission.-Prior to initiation of regular production the contractor shall submit a first article sample consisting of 200 lbs of wax in accordance with instructions issued by the Contracting Officer for evaluation in accordance with paragraph 4.2.2. All samples submitted

19、shall have been produced by the contractor using the same production process, procedures, and equipment as will be used in fulfilling the contract. shall be accompanied by certificates of analysis. quantity, or portion thereof, as directed by the contracting officer, shall also be submitted whenever

20、 there is a lapse in production for a period in excess of 90 days, or whenever a change occurs in manufacturing process, material used, drawing, specification or source of supply as to significantly affect product uniformity as determined by the Government. The sample A first article 4.2.2 Inspectio

21、ns to be performed.-The sample will be sub- jected by the Government to any or all of the examinations or tests specified in 4.4 or 4.5 of this specification and any or all requirements of the applicable drawings and qualification test procedures. of the applicable requirements, the first article qu

22、antity shall be rejected. The Government reserves the right to terminate its inspections upon any failure of a sample to comply with any of the stated requirements. 4.2.3 Rejection.-If any sample fails to comply with any 4.3 Qualification Inspection 4.3.1 Submission.-The manufacturer shall submit a

23、sample of his,product to a Government approved facility as designated by the preparing activity for.qualification testing (see 6.3 and 6.4). All samples submitted shall have been produced by the manufacturer using the same procedures, processes and equipment as will be used in regular production. Th

24、e sample shall be accompanied by a certificate of analysis which shows the location of manufacture. 4.3.2 Qualification Testing.-The testing will include but will not be limited to the following (see 6.4.1 and 6.4.2). a. pressibility b. incorporability 4 Provided by IHSNot for ResaleNo reproduction

25、or networking permitted without license from IHS-,-,-I _ I MIL-W-20553D 93 9997906 0302858 8 . MIL-W- 20 553 D - c. sensitivity d. compatibility e. flow properties of formulated explosives f. cast shrinkage In addition to the qualification tests, each sample of wax shall meet the requirements given

26、in 3.2. 4.3.3 Re-Examination.-Re-examination of a qualified pro- duct shall be required by the preparing activity under any of the following conditions: (1) The manufacturer has modified the product or changed the material or processing sufficiently so that the validity of previous qualification is

27、questionable. (2) The requirements in the specification have been revised sufficiently to affect the character of the product. (3) When deemed necessary to determine that the pro- duct continues to meet all of the specification requirements. (4) A change in the “fingerprint“ has occurred (see 6.4.3)

28、. 4.4 QUALITY CONFORMANCE INSPECTION 4.4.1 Lot formation.-A lot shall consist of that quanti- ty of desensitizing wax produced by one manufacturer, in ac- cordance with the same specification or same specification revision under one continuous set of operating conditions. The lot size shall not exce

29、ed 70,000 lbs of material and each lot shall consist of that quantity of material that has been sub- jected to the same unit chemical or physical mixing process intended to make the final product homogeneous. The product shall be submitted for inspection in accordance with MIL-STD- 105. 4.4.2 Examin

30、ation.-Sampling plans and procedures for the following classifications of defects shall be in accordance with MIL-STD-105. Contractors sampling plans, if used, shall be approved by the Government and shall provide, as a minimum, the protection afforded the Government by the sampling plans in MIL-STD

31、-105. Continuous sampling plans in accordance with MIL-STD-1235 may be used if approved by the procuring activity. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-20553D 91 7997906 0102859 T M . i MIL-W-20553D Also, at the option of the procu

32、ring activity, AQLrs and sampling plans may be applied to the individual characteristics listed, using an AQL of 0.40 percent for each Major defect and an AQL of 0.65 percent for each Minor defect. 4.4.2.1 Container sealed Categories Defects Critical: None defined Method of Inspection Major : . AQL

33、0.40 percent 101. Container damaged to the extent that the contents are exposed, or likely to become exposed in subse- quent handling Visual Minor: AQL 0.65 percent 201. Marking misleadlng or uhidentifiable Visual 4.4.3 Sampling for test (see 3.2).-A representative sample of approximately 5 pounds o

34、f the wax shall be selected from each lot of desensitizing wax submitted for acceptance. The sample shall be tested for the following properties and the results recorded (see 6.2.2): Prop er t y Melting Point viscosity Penetration Flash Point Organic Insoluble Matter Alkalinity Acidity Oil Content E

35、xudation * Fingerprint DSC Congealing Point Softening Point Type of Defect Major Ma j or Ma j or Major Major Major Major Maj or Major See 6.4.3 See 6.4.3 See 6.4.3 See 6.4.3 Test Paragraph 4.5.1 4.5.2 4.5.3 4.5.4 4.5.5 4.5.6 4.5.7 4.5.8 4.509 4.5.10 4.5.10.1 4.5.10.2 4.5 .lo. 3 4.5 Test.Methods and

36、Procedures (see 6.8).-The tests in 4.5.1 through 4.5.11 shall be performed using prescribed analytical 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-20553D 91 99799Ob 0302860 b m I* MIL-W- 20553D procedures for replicate determinations give

37、n in standard ana,- lytical textbooks. _- 4.5.1 Melting Point.-The melting point shall be determined in accordance with ASTM Method Dl27. 4.5.2 Viscosity.-The viscosity shall be determined in ac- cordance with ASTM Method D445 using the Ubbelohde viscometer. 4.5.3 Penetration.-The accordance with AS

38、TM Method 4.5.4 Flash Point.-The accordance with ASTM Method penetration shall be determined in 1321. flash point shall be determined in D92. 4.5.5 Organic Insoluble Matter.-The solvent for this determination shall consist of either benzene or aliphatic naphtha. Use clean medium porosity glass filte

39、ring crucibles which will allow 20 ml of hot solvent to flow through them, under suction, within i5 seconds or less. Condition the cru- cibles prior to use as follows: wash three(3) 20 ml portions of hot solvent through the crucible with the aid of suction, wash one (1) 20 ml portion of acetone thro

40、ugh the crucible, back wash the crucible with one (1) 20 ml portion of acetone, dry the crucible in an oven at 100 f 5OG, cool the crucible in a desiccator, weigh the crucibleand record weight, return . crucible to oven and maintain at 100 + 5OC until used. - Weigh approximately 5 grams of the sampl

41、e to the nearest 0.1 milligram and transfer to a 400 ml beaker. Add approximately 250 ml of solvent to the beaker. Dissolve the wax in the solvent by placing the beaker and contents on a steam bath and heat at a temperature of 65Oc minimum. Continue heating until the wax dissolves (stirring may be u

42、sed). Filter the hot solution through the previously conditioned and tared hot crucible with the aid of suction. Maintain the crucible and contents at above 6OoC to prevent the wax from coming out of the solution. Use a heat gun or other commercially available equipment to maintain the temperature o

43、f the solution. Wash the crucible with hot sol- vent until the residue and crucible are free from wax, or until approximately 5 ml of the washings, when evaporated to dryness, leaves no residue. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W

44、-20553D 71 = 7777706 O1028b1 8 W - i 1 , MIL-W- 2055 3D Retain the filtrate for the determination of alkalinity as specified in 4.5.6. During filtration air must not be sucked through the crucible. This is to prevent the air from cooling the filtering surface which could cause the wax to come out of

45、 solution and clog the crucible. Dry crucible and contents in an oven for 30 minutes at OOC to iO5OC, cool in a desiccator and weigh. The percentage of insoluble matter is calculated as follows: Percent insoluble matter = 100A W Where : A = increase in weight of filtering crucible, in gm. W = weight

46、 of sample, in gm. 4.5.6 Alkalinity.-The filtrate from the determination of insoluble matter (4.5.5) shall be transferred to a 500 ml separatory funnel, and the flask shall be rinsed with two, 10 ml portions of benzene. Twenty-five ml of distilled water shall be added to the funnel. The funnel shall

47、 be shaken, the phases allowed to separate, and the aqueous layer withdrawn, The procedure of adding distilled water, shaking, and separating shall be repeated two more times. The aqueous extracts shall be combined. The extract shall be tested with red litmus paper of such sensitivity that its color

48、 is completely changed in one minute by .O04 Wormal (N) sodium hydroxide solution. The water extract shall be considered to be alkaline if upon application - red litmus paper changes color within 30 seconds. The water extract shall be reserved for determination of acidity (see 4.5.7). cator shall be

49、 added to the water extract, obtained as specified in 4.5.6, and the solution shall be titrated with approximately 0.1N sodium hydroxide solution. A blank determination shall be made on the same quanitities of benzene and water as were used in dissolving and ex- tracting the sample. Any acidity shall be calculated to percentage of acetic acid in the sample as follows: 4.5.7 Acidity.-Thyee drops of phenolphthalein indi- 8 #