ARMY MIL-T-46938 C (1)-1996 TETRACENE《并四苯》.pdf

1、MIL-T-46938C (AR) AMENDMENT 1 20 December 1996 MILITARY SPECIFICATION TETRACENE This Amendment forms a part of Military Specification MIL-T-46938C (AR), dated 16 May 1994, and is approved for use by the US. Army Armament Research, Development and Engineering Center and is available for use by ali De

2、partments and Agencies of the Department of Defense. PAGE 4 3.2 TableI. Characteristics Reauirement Delete: “Melting and explosion 127 deg 3 deg C point and substitute: “Decomposition point/ 127 deg 3 deg C purity 97% min PAGE 6 4.3 TableII. -t Delete: “Melting point (decomposition) and substitute:

3、“Decomposition point/purity Test method para 4.5.3” para 4.5.3” Requirement para Inspection method 3.2 4.5.3 or 4.5.3.1” 3.2 4.5.3” AMSMC NIA lof3 FSC 1376 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking per

4、mitted without license from IHS-,-,-MIL-T-4b938C (3) = 9999906 2026374 424 W MIGT-46938C (AR) AMENDMENT 1 PAGE 8 4.4.2.1 Classification major. Delete: “102 Melting point (decomposition) ” in its entirety and substitute: “102 - Decompositionpointpurity - 4.4.3.3 - 3.2 - 4.5.3” PAGE 9 4.4.3.3 Test for

5、 lot acceptance. Delete fiom line 10: “melting and explosion point” and substitute: “decomposition pointpuritf PAGE 10 4.5.3 Delete paragraphs 4.5.3 and 4.5.3.1 in their entirety and substitute the following paragraphs: “4.5.3 Decomposition poidpurity. Prepare a 7% sulliinc acid solution and label B

6、lank Solution. Place approxhately 0.1000+/-0.0050 grams of tetracene in a 100 ml volumetric flask. Add about 70 ml of the 7% sulfuric acid solution to the volumetric flask and sonicate with cooling until the tetracene dissolves completely. Make up to volume with the 7% suifuric acid and label Stock

7、Solution. Pipette 10 mi of the Stock Solution into a 100 ml volumetric flask, dilute to volume with the 7% sulfuric acid, and label First Dilution Solution. Pipette 10 ml of the First Dilution Solution into a 100 ml volumetric flask, dilute to volume wih the 7% sulfiiric acid, and label Worlcing Sol

8、ution. Use an ultraviolet spectrophotometer to measure the absorbance at 278 nm using a 1 cm silica cell of (1) a sample of the Blank Solution (7% sulfiinc acid), and (2) a sample of the Working Solution. Calculate the purity of the tetracene as: Tetracene % = j12.39) Abs net) 0 Abs =absorbance W Ab

9、s net = Abs of the working solution mh;is the Abs of the 7% sulfuric acid solution = weight of sample in grams, (see 6.5) 4.5.3.1 -q. Place 0.5 - 1.0 mg of dry tetracene obtained in 4.5.1 into a melting point capdiary tube or, alternatively, fi the capillary tube according to standard practice, tapp

10、ing lightly to fill the bottom of the tube to a height of 5 to 10 mm. Put on a safety mask and determine the melting point in a Vanderkamp apparatus or eqUal. 4.5.3.2 Alternate decomposition pointlpw-ity method #2). Determine the melting 2 Provided by IHSNot for ResaleNo reproduction or networking p

11、ermitted without license from IHS-,-,-J MIL-T-46938C (AR) AMENDMENT1 (decomposition) point by means of any commercially available melting point apparatus which uses samples packed in capillary tubes and whose temperature rise can be controlled to at least 0.3 degrees C per minute. In determining thi

12、s property of tetracene, prepare a capillary tube sample in accordance with good laboratory practice or according to instructions accompanying the instrument. Rapidly bring the temperature of the instrument to the initiai temperature of 120 degrees C and equilibrate until there is no fluctuation whe

13、n held for at least 10 minutes at this temperature. Insert the sample of tetracene and raised the temperature at 0.3 degrees C per minute. The temperature at which the material first forms a meniscus in the capiary is the melting ( liquefaction) point. The accuracy and precision of the instrument sh

14、a be periodically determined by means of certified standards melting in the vicinity of the liquefaction point of ttracene. Due caution must be exercised when heating this primary explosive. Samples may decompose with explosive force if heat is applied too rapidly and can cause operator injuries or instrument damage (6.5 applies).” custodian: Army-AR Preparing activity hY-AR (Project 13 76-0045) 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-