Micronized particle size

Andreev Chuiko (Ref 35) observed stable burning in PETN of 5 micron particle size and relative density 6 = 1.17, up to 60 atm pressure. At higher pressures (up to 100 atm) burning rate increased rapidly. The pressure at which transition from stable to accelerating... 

Powdered Teflon for use in pyrots is covered by US Mil Spec MIL-P-48296IPA) (1 May 1974), Polytetrafluoroethylene (TFE) . Three classes of material are specified (1,2 3). The requirements are purity, 99.4% min infrared spectrum, peaks consistent with figure shown color, TFE shall be opaque and the color shall range from white to gray moisture, 0.05% max ash, 0.1% max mp, 337° 10°C packing density, Class 1 — 1.18 0.13g/cc, Class 2 - 1.25 0.02g/cc, Class 3- 1.14 0.09g/cc particle size by sieve analysis, Class 1 — 95 15 microns, Class 2 — 237 27 microns, Class 3 — 200 30 microns particle size distribution by sieve analysis, as specified in Table 1... 

Bag filters are composed of woven material that intercepts small particles on the filter surface by impingement and electrostatic attraction. The efficiency of collection increases as the depth of the filter cake increases, making these filters highly efficient for small diameter, even sub-micron, particle size. Filters are periodically shaken or back-flushed to remove particulate accumulation. These filters are usually constructed of woven materials suitable for operation at low temperatures up to about 350°C. 

The effect on detonation transfer of the parameters shown in Fig Ex22 were reviewed for the donor and acceptor expls RDX, HNS-1 (2,4,6,2/,4/,6/-Hexanitrostilbene of 3 microns particle size) HNS-11 (Same as HNS-1, except of 200-300 microns particle size), DATB (1,3-Diamino-2,4,6-trinitrobenzene), and TATB (1,3,5-Triamino-2,4,6-trinitrobenzene) with a wide cross-section of sensitivities. Eash of these parameters has been individually qualified and explained on both the theoretical level and the impact on practical hardware design. The experimental study is described in Ref 2 Refs 1) M.L.Schimmel, "Quantitative Understanding of Explosive Stimulus Transfer... 

Graphite, Colloidal. It may be either natural or artificial graphite ground to 1 micron particle size, coated with a protective colloid, and dispersed in a liq. One selects the liq carrier — water, oil, or synthetics — for the use intended. The two outstanding props of colloidal graphite dispersions are 1) the particles remain in suspension and 2) the... 

C) Colloidal Lead Azide (abbrd as CL A) or Type II (US) is nondextrin ated LA of very small (3-4 micron) particle size, patented in 1933 by Rinkenbach (Ref 2). For its prepn, to an aq soln contg 4% of Na azide was rapidly added, while mechanically agitating and maintaining the temp at 25°, a soln of Pb nitrate or Pb acetate in slight excess of the amt necessary for the equation ... 

U. S. Sieves are identified by either micrometer (micron) designations or arbitrary numbers. Thus, a material referred to as 60/80 means particles which will pass a 60 mesh screen but not an 80 mesh screen. You may also see this written as -60+80 mesh. Particle size is much better expressed in micrometers (microns), therefore 60/80 mesh would correspond to 250-177 micrometers (micron) particle size range. Table 2.5 shows the conversion of column packing particle sizes. The table shows the relation... 

Si alloy. Popov et al (Ref 14) also published a study in which he spark-detonated Al-Si alloys (19.1 and 80.5% Si) having a 56 micron particle size which were dispersed in an aerosol. It was found that the lower expln limits of these alloys were 44g/m2 for the 19.1% Si concn and 800 g/m2 for the 80.5% Si concn... 

Samples. Two of the coals used 1n this study were obtained from the Penn State Coal Sample Bank, an HVA bituminous coal (PSOC 1103) from the Upper Elkhorn 3 seam in Eastern Kentucky and an HVA bituminous coal (PSOC 828) from the Brazil Block seam in Indiana. A third coal from which vitrinite and fusinite were hand picked was an Illinois No. 2 seam HVC bituminous coal from Northern Illinois. Also, resinite and vitrinite samples were hand picked from a Hiawatha seam bituminous coal from the King 6 mine in Utah. Finally, the alginite sample was obtained from an Ohio No. 5 seam (PSOC-297) coal by 06C (2,5). All of the elemental and petrographic analyses are presented in Table I. The details of the sink-float technique have been reported previously (1). Typically, a 3 micron particle size demineralized coal Ts centrifuged in aqueous CsCl2 solution of the appropriate density with a small amount of surfactant added to disperse the coal particles. The exinites in the float are... 

Pen Kem Acoustophor 8000 system (now Dispersion Technology) The system was extended for the measurement of sub-micron particle size distributions in concentrated slurries [238] which resulted in a prototype instrument, the Acoustophor Penn Kem 8000 system. This instrument consists of two flow-through cells for acoustic and electro-acoustic measurements respectively. With this system the acoustic attenuation is... 

Brookhaven BI-90 is designed for routine sub-micron particle sizing in quality control. Operation of the instrument is fully automatic and a series of repeat measurements including data processing can be set up easily. 

Brookhaven 90 Plus sub-micron particle size instrument is a dual-angle instrument with measurements at 15° and 90° to generate size distributions in the 10 nm to 1 pm size range together with zeta potential determinations. 

Separation colunms and buffer concentrate are available from Michrom. The column used for the PTH analysis is a 1 x 150 mm column packed 3 micron particle size, 100 A pore size Reliasil CIS. The buffer system for PTH separation is an acetate buffer with ion-pairing agent a sh low gradient running from buffered acetonitrile to buffered n-propanol was used for the chromatograms depicted here. 

Gas cleaning efficiencies of ca. 99.95% have been obtained, with typical filter outlet dust loads of 5-10 mg/Nm LCV gas. These values are acceptable for gas turbine (combustor) operation considering also the sub-micron particle size of solids permeating the filter, see e,g. [14], The values are also well below Dutch emission standards for power producing stations as well as waste incinerators, see e.g. Bergsma et al. [15]. 

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