Hess test

Same as Brisance Meter of Hess Test described in Vol 3, p C492 C493... 

Dunkle s Syllabus (1957-1958) Shock Tube Studies in Detonation (pp 123-25) Determination of Pressure Effect (144-45) Geometrical and Mechanical Influences (145-48) Statistical Effects of Sensitivity Discussion on Impact Sensitivity Evaluation (148-49) Pressure in the Detonation Head (175) Temperature of Detonation (176) Charge Density, Porosity, and Granulation (Factors Affecting the Detonation Process) (212-16) Heats of Explosion and Detonation (243-46) Pressures of Detonation (262-63) A brief description of Trauzl Block Test, Sand Test, Plate Dent Test, Fragmentation Test, Hess Test (Lead Block Crushing Test), Kast Test (Copper Cylinder Compression Test), Quinan. Test and Hop-kinson Pressure Bar Test (264-67) Detonation Calorimeters (277-78) Measurements... 

German 132° Test, Grottanelli s Test, Guttmann Test, Haid, Becker Dittmar Test, Hansen s Test, Hess Test, Hoitsema Test, Horn-Seifert Test, International 75° Test, Jensen s Test,... 

Hess Test. In this test, a sample of an explosive was heated at 70° in a current of air which was then passed into a solution of zinc iodide and starch. The time taken to impart a blue color to the solution was noted (Ref 2)... 

W) C. Belgrano, "Gli Esplosivi , U. Hoepli, Milano (1952), pp 15 to 53 (Physical tests for mining explosives. Included are density, stability, Trauzl test, detonation velocity, Hess test, crusher test, sympathetic detonation test, sensitiveness to initiation, sensitiveness to impact, steel plate test and explosion temperature determination) pp 73 to 75 (Analysis of NG) 76 to 84... 

Lead B odi(or Cylinder) Compress on (or Crushing) Tost(Lesd Block Teat or Hess Test) (Stsuchprobe nach Hess, in Ger) (Iipreuve au block de plomh, in Fr) is one of the German teats for brisance, also called percussive force. It will be described in Vol II, under Compression Teats Lead Block Expansion Test. See Trauzl Test Lead Plate Test. See under Plate Tests... 

In the US modification of Hess test, which has been used by Bureau of Mines under the name of Compression Test with Small Lead Block, one lead block is used. It is 38mm in diam 64mm thick and is placed upon a rigid steel support imbedded in concrete. The block is covered with a disk of annealed steel, 38mm in diam 6.4mm thick. On top of the disk is placed a lOOg charge of expl to test, provided with a No 6 blasting cap. Detonation of the expl compresses the block appr proportionally to the brisance of expl (Ref 6 pp 107-08)... 

Quinan test) 12)Vivas, Feigenspan 8c Ladreda 4 (1945) - not found 13)Carpio 1 (1948), 64-7 (Hess Kast s tests) 14)Belgrano (1952), 39 -43 (Hess test and its modifications) 15)Giorgio (1964), 82-4 (Hess 8c Kast s tests)... 

In the French version of Hess test, known as epreuve des petits plombs, which was developed by the CSE (Commission des Substances Ex-... 

Epreuve des petits plombs ou Epreuve aux blocs de Hess (Small Lead Blocks Test or Blocks of Hess Test). This test, known in the USA as Lead Block Compression Test (LBCT) or Hess Crusher Tes (Stauchprobe nach Hess, in Ger) was invented in Austria by Hess. It is one of the Compression (or Crusher)Tests for Oetetmination of Brisance, described in Vol 3 of Encycl, pp C492 to C494. Its French modification, designed by La Commission des Substances Explosives, is listed on p C493-L, but not described. 

Hatter s glue, 120 Heat test, mr stabiUty of explosives, 71 Hess test, for stability of cxplodves, 78 Hexamethykne triperoxide mene, 61 Hexanitrodiphenylamine, 49 Hexanitrodiphenylsulphide, 49 Hoitsema s test, for stability of explosive 7 Horn-Seifert test, for stability of explosives, 79... 

The experimental setup for the determination of the brisance by the Hess test is shown in Figure 5.21. 

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