1、e - _- .- - - - -I- -MIL-R-L3742 13 777770b 0275683 7 1.1 This specification covers deeensitized RDX Intended for use as a component of Military aJaemlte. t 2. APPLICABLE mmm I 2.1 The following epeclflcations, standarda, drawings, and publicationa ana all drawings end specificationa referenced ther
2、eon, of the lesue in effect on date of invitation for bids, fonn a part of thle specification: Bin-L-2104 MILis, =Pack$- and Marking -* . I - A*.% - -Carton, PaPediately upon reecking the - preliminary end point,-Che stop watch shall be released and buret reeding8 taken. Approximatly 10 ul. of the r
3、eagent, accurately measured, sbaU be added end the eolution ehall be titrated immediately with standerd water-in- metbsnol eolution. Theee uperatione ehall be controlled to reach the second end. pQnt within 3.5 minute6 plus or mnue 15 Becoade from the preliminary end point. This second end point may
4、 b useda the preliminary end point for a check stend- arizetion, En thie ceet, the atop wtch abalhanol roluton to the prcliminsry end point exactlu as specified in 4,4+4. taken ibdiftieiy. grame of iroduin tartrete dihydrata wegbed By aiffereilc to the neeriet mlU;grsm, , 4.4.3.2 Stanerd water-ia-me
5、thanol solutibn.-A lO-iiii portion of epecial The stop watch shI1 be released and buret readings From a g-ss stoppered weighing bottle, about 0.5 c t _- - .r - .- . - .- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-13742 (Ord) e shallbc quic
6、kly introduced. added and back-titrated with standard water-in-methanol solution to the final exact end poSnt standardization factor I? cacu.ated as ollows: A slight excess of Karl Fischer reagent shall be wi+,hin 3.5 minutes. The titration shall be repeated at least once and the I where: F = grams
7、of water per ml of standard water-in-methanol solution W = grame of sodium tartrate dihydrate V = ml Karl Fischer reagent used for titration R = ml standard water-in-methanol solution per m1 Karl Fischer reagent S = ml standard water-in-methanol aolution for back-titration 4.4.4 Procedure.-A 100-ml
8、portion o the special solvent shall be transferred through the sample port-hole into the dry beaker of the titration assembly contaia- ing a plastic coated magnet, and stoppered immediately. shall be kept covered at all times, water in thia solvent titrated by adding a slight excess of the standardi
9、zed Karl Fischer reagent to produce a reddish-brown color which persists for at least half a minute. Tb variable resistance should be adjusted at this point so that, with the excese Fischer reagent present, the needle of the micro-ammeter (see figure 1) is at the upper end of the scale. The solution
10、 shall be titrated slowly with the The end poini shall be defined as the point at which one drop of the standard water- in-methanol solution causes the miro-ameter needle to waver and then slowly drift from the upper end of the scale toward the lower end is not less than 15 seconds. When the prelimi
11、nary end point is reached All 10-gm portion or the sample, weighed by difference from a glaas-stoppered weighing bottle shall be introduced quickly into the beaker through the sample porthole of the rubber stopper. Loss of 0.05 gm of the sample has no appreci- able effect on the accuracy of the dete
12、rmination, immediately and the contents of the beaker stirred for 15 minutes by means of the mgnetic sti-er. Then a slight excess of the standardized Fischer reagent shall be added. part of the scale. The solution shall be carefully back-titrated with standard water-in-methanol solution to reach the
13、 exact an final end point in 18.5 fO.25 minutes for the tim the preliminary en point was reached. point shall be obtained in the mm manner as the preliminary end point (defined above ) was obtained. The volume of the back-titration should be lese than 1 ml. A blank determinaton shall be coniucte usi
14、ng l ml of the special solvent o- by titrating to the preliminary end pint, stirring for 15 minutes, end then .completing the titration to the exact final end point 18.5 f 0.25 minutes a8 epecificd above for the sample. The platinum electrodes the magnetic stirrer shall be started end the . t I 1 wa
15、ter-in-methanol solution until the exact preliminam end point is reached. 1 i the stopwatch shall be relceeed. sbcceedint3 operatione shall be completed within 18.5 f 0.25 minutes. An 8-to i : ; I 1 The porthole shall be closed This causes the need-le of the micro-ammeter to return to the upper The
16、final end . The percent water in the sample ahell be i, I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1 i Cih-wBf A r: weight of the crucible axxi reddue B 1 wem6 of the ciucible mty W t weight Of sanpie on a misture-free basis 4,fj.Z mine oil co
17、ntent.-The oil content shall be determined by difference by adding the percentages of X and misture and subtracting the sum from 100 percent 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-13742 13 7979906 0275689 T W - . . MIL-R-137rCZ (Ord)
18、 4.6 Acidity.- of 0.01N sodium-hydroxide solution. The indicator solution shall be neutralized to the blue green end poiht, and made up to 250 ml with water. mlve drops of mixed indioakor shall be added to the water layer in the 800 ml beaker and titrated with 0.05 normal sodiwn hydroxide to a blue
19、green end point. Concurrently, a blank determination shall be run for correction of aay acidity in the solutions. The acidity shall be calculated as percent acetic acid as follows: Two hundred fifty ml of The beaker Shallbe covereuI from I Provided by IHSNot for ResaleNo reproduction or networking p
20、ermitted without license from IHS-,-,-5,2 labelina and markin rad the fact that the Government my have formulated, furaiahad, or in any way supplied the asid drewings, specifications, or other date ie not to e regard& by implication or ot&nrise as in any mnner licensing thR holder or a= otber person
21、 or corporation, or conveyirig ariy righte or permission to manufacture, me, or eel1 any phntCp invention that - my Sriy Way bc $hamtQ. -. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Ma-a-13742 (rd) 1.5 VOLT DRY CELL MICRO AMMETER WESTOM MODEL 44
22、0 RESISTANCE= 154 OHMS MERCURY CONECTIW PhATtNUM ELECTRODES SEALED INTO GLASS Y - wtRING DIAGRAM FIGURE t Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-13742 (Ord) Provided by IHSNot for ResaleNo reproduction or networking permitted without l
23、icense from IHS-,-,-_- MIL-R-13742 13 = 7777706 0275673 1 3 “ TWO HOLES APPROXE DIA FOR ELECTRODES HQLE APPRXg DIA DRYING TUBE TWO HOLES APPRO$ IA FOR BURETS SAMPLE POW“ - HQLE ABPWBX c.“ DEA RUBBER STOPPER-TOP VIEW FIGURE 3 11 - I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
