1、1. s. . MIL-C-427A 13 September i968 SUPERSEDING JAN-(2-427 . I 12 December 1946 and condenser (Liebig type, 250 mm straight tube with lower end cut obliquely) by means of corks carefully selected and bored so that vapors will not escape through the connections. There shall be at all times a suffici
2、ent stream of cod water through the condenser jacket to condense all the solvent, have been previously cleaned with dichromate cleaning solution with not rr.ore The moisture tube shall Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. - - NIL-C-VZ7A
3、33 7977706 0293360 3 MIL-C-427A than six determinations run between cleanings. tube to the top of the condensep to keep out atmospheric moisture. the flask by means of a suitable steam, hot water, or oil bath so that the distillate falls from the end of the reflux condenser in a steady stream. the b
4、ath and allow to cool to room temperature. from the condenser and tilt the tube so that sufficient carbon tetrachlor- ide drains back into the flask to bring the water layer into the grad- uated tube. water is collected in the graduated area. Hold the tube in a vertical position and read (i) the top
5、 of the upper meniscus of the water layer (straight across), and (2) the top of the carbon tetrachloride layer, estimating to 0.01 ml on each reading. Should the water layer extend beyond the graduated portion of the tube, repeat the determination using a smaller sample. Connect a calcium chloride H
6、eat Continue the heating for 30 minutes. Remove the apparatus from Disconnect the apparatus Drain the upper part of the tube completely so that all the Calculate the percent moisture as follows: Percent moisture = 100 V w where V = corrected volume of water in ml W = weight of sample in gm 4.3.4 Ace
7、tone insoluble material - Place a weighed portion of approximately 10 gm of C-3 in a 400-ml beaker and add 200 ml of acetone. Heat the sample gently on a steam bath with occasional stirring for 15. minutes. Filter through a tared filtering crucible, transferring all insoluble material to the crucibl
8、e. 105 + 2OC (221 t 4OF) for 1 hour, cool in a desiccator and weigh. culate the increase in weight as percent acetone insoluble material. Wash with hot acetone, dry at Cal- 4.3.5 Acetone insoluble material (inorganic) - If the percent acetone insoluble is less than 0.05 percent, no further test need
9、 be made. acetone insoluble material, cool in a desiccator and weigh. Calculate the weight of ignited residue as percent.inorganic insoluble material. If greater than 0.05 percent, ignite the crucible containing the 4.3.6 - Grit - Place a weighed portion of approximately 50 gm of C-3 in a 400-ml bea
10、ker, Add 100 ml of carbon tetrachloride and heat on a steam bath until all lumps are broken down and all soluble material is dissolved. Decant through a small No. 40 U. S. Standard sieve placed on a No. 60 U. S. Standard sieve retaining the insoluble material in the beaker. Add acetone to the beaker
11、 and heat to dissolve the insoluble matter. Pour this mixture through the nest of sieves making sure all insoluble matter is transferred to the sieves. sieves with acetone and dry the sieves. Count and examine any parti- cles retained. sistence of a scratching noise when pressing Emd rubbing the mat
12、erial with a smooth steel spatula on a smooth glascsli.de. Wash nay residue on the Note if the particles are grit. as indicated by the per- 6 .- Y . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-427A 4.3.7 Plasticity - Make a cylinder of Comp
13、osition C-3 approx- imately 1 inch in diameter and 250 and 300 gm in weight by handworking. Place it in the half-section mold (item 1, Figure 2) and slip a brass ring (item 2, Figure 2) over each end so that the flanges are toward the center. position firmly in at one end and attach the end cap (ite
14、m 3, Figure 2). T-reat the other end similarly, then remove the end-caps and the half- section molds and adjust the distance between the flanges to 1 inch. Hold one ring firmly, and pull the other slowly and steadily along the edge of a graduated rule fixed on a bench so that the cylinder of Com- po
15、sition C-3 is gradually extended. flanges when fracture occurs; This distance, less 1 inch, is the measure of the extension. tained between 25O and 3OoC (77O and 86OF) during the test. Place the second half-section mold in position, press the com- Note the distance between the The temperature of the
16、 Composition C-3 shall be main- 4.3.8 Detonation - Prepare 5 detonation assemblies as follows: . Press 20 gm of Composition C-3 into a paper tube, 1 inch long, 1 inch inside diameter and 0.01-inch wall thickness. flat and flush with the edges of the paper tube. 4 inches square and 0.250 inch 1-0.008
17、 -0.005 inch thick, cut from hot rolled mild steel plate having a carbon content of 0.15 to 0.25 percent. Grease the center of the plate lightly with mineral jelly, Apply the flat end of the charge to the greased center of the plate and press firmly to insure good contact between the charge and the
18、plate. Make the top surface of the Composition C-3 as flat as possible and flush with the top edge of the paper tube. and 1/2 to 3/4 inch deep in the center of the charge. with charge, on a flat bed of sand at least 4 inches deep. electric blasting cap conforming to the requirements for Type IL of M
19、IL-C- 14003, except that the base charge shall be not more than 9.5 grains of PETN (pentaerythrite tetranitrate). Inspect the plate for perforation immediately beneath the charge. lot shall be considered acceptable if five complete detonations and five perforations of the steel plate are secured fro
20、m tests on the five sam- ples that represent the lot. Make one end of the charge Select a steel plate Make a hole 1/4 inch in diameter Place the plate, Select an Insert the cap in the hole and fire. The 4.3.9 Acidity - Place a 10 gm sample of C-3 in a liter beaker, add 100 ml of acetone and heat on
21、a steam bath without boiling off the solvent. Add 100 ml carbon tetrachloride and stir to insure homogeneous solution, then add 500 ml water. with vigorous stirring to insure complete washing of the carbon tetra- chloride. 12 drops of mixed indicator made by dissolving 0.15 gm brom cresol green and
22、0.10 gm methyl red in sodium hydroxide solution, then neutralized and made up to 250 ml with water. to a blue green end point, linity of reagents. Crush the lumps and stir until the sample is dissolved. The first 200 ml of water should be added slowly The final 300 ml may be added more rapidly. Cool
23、 and add Titrate with 0.05N sodium hydroxide Run a blank and correct for acidity Calculate the acidity as percent “O3 as follows: or alka- Acidity as percent “O3 = 6.302 (V-v) N w Where V = ml NaOH used in titration of sample v = ml NaOH used in blank titration W = Em of sample / N = normality of Na
24、OH solution 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-427A MIL-C-427A 13 9999906 027LLb2 5 Y74 ,.- 25MM 1.D. 20MM _CP + 2MM - 1 L C - -. . *- . . . -. . . .- I. CAPACITY I 1 mi. in graduated pirtin . GRADUA!ION INTERVAL: 0.02 ml, numbw
25、ed every 9.2 ml. Graduation lines to be etched fine but distinct as follows: 0.2 ml. lines - circumferential 0.Lm. lines - 3/4 circumferential 0.02 ml. lines - 1/2 circumferential . HATERIAL: Pyrex or equi heavy wall _ - Provided by IHSNot for ResaleNo reproduction or networking permitted without li
26、cense from IHS-,-,- MIL-C-427A 13 979970b 0273365 O R MIL-C-427A t se 6.4 c-3 plasticizer (minus nitrocotton) - The C-3 plasticizer which has been approved for use in the fopmulation of Composition C-3 consists essentially of the component materials listed below. ization pertaining to the substituti
27、on of component materials in the approved (2-3 plasticizer may be obtained from the Naval Ordnance Systems Command, Department of the Navy, Washington, D. C. Author- 20360. * Component Material (See 6.5) Nominal Percent by Weight Tetryl 3 TNT 4 Dinitrotoluene 10 Mononitrotoluene 5 6.5 Advisory formu
28、lation for Composition C-3 (see 3.2) - Component Material Specification Type, Grade or Class Nominal percent by weight RDX MIL-R-398 Type B, Class A 77 Tetryl JAN-T-339 Grade I, Class A 3 TNT MIL-T-248 Type I, Coarse Flake 4 Dinitrotoluene MIL-D-204 - 10 Mononitrotoluene Commercial Tech- - 5 Nitroce
29、llulose MIL-N-244 Grade A, Type I or II 1 nical grade * 6.6 Supersession data - The grade of Composition C-3 furnished under this specification is completely interchangeable with and substitu- table for Grade B procured under the previous issue, JAN-C-427 dated 12 December 1966, been deleted from th
30、e Federal Supply System. *. Composition C-3, Grade A of the previous issue has I i * 6.7 Changes from previous issue - The margins of this specifica- tion are marked with an asterisk to indicate where changes (additions, modifications, corrections, deletions) from the previous issue were made. This
31、was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the la
32、st previous issue, Custodians: Navy - OS Air Force - 70 Review activities: Navy - OS sr activities: Navy - AS, CG Air Force - 70 Preparing activity: Navy - OS . (Project No. 1375-0091) 7 11 -. , x - . 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
