Cotton cloth filters

Cotton cloths are sometimes treated with metallic salts (copper sulfate) to improve their corrosion-resistant qualities. Such cloths are in the usual cotton filter cloth grades, and while they are not equivalent to metallic cloths, the treatment does materially prolong the life of the cotton fiber. When dealing with metallic cloths, the following terms are important ... 

Cotton filter cloths Woven cotton cloth stretched on a frame to produce a filter medium. 

Air filter (2.0 L/min air flow) Underwear + coveralls cotton cloth patch Soapy water 85 (4) 77 (6) 91 (10) ... 

Plug the bottom of the funnel with cotton balls or cotton cloth to create a cotton-filter. Pour the contents of Jar B through the funnel and into Jar C. Squeeze the root-bark contents inside the filter to press out the remaining juices. Save the root-bark that has been caught by the filter and place it back into Jar B. 

Figure 3 shows a significant difference in thoron progeny activity plated-out on laboratory coat cotton cloth samples and Millipore filters (0.8 /un), and emery cloth. Differences between the two latter sample materials are not clear in these measurements. 

Figures 4 and 5 show significant differences in thoron progeny activity plated-out on cotton cloth and emery paper (Figure 4), and cotton cloth and Fiberglas filters (Figure 5). Differences between the other pair of materials were less pronounced or difficult to ascertain (<7 ).

The spectral ratios (S.R.) given in Tables II and III show that Nuclepore filters and copper discs have the highest S.R., indicating that less degradation of the spectra, and hence, highest energy resolution, occurs. It should be noted, that except for cotton cloth (Table II), there seems to be a correlation between the S.R. and the activity plated-out on the material. 

Dumont s filter consists of a wooden box of j he form of a four-aided truncated pyramid with a double bottom. The inner bottom is a metallic plate pierced with numerous holes upon it a cotton cloth is kid, and coarse-grained animal charcoal moistened with water is then Bpread layer by layer each layer being rendered of uniform thickness, and packed or pressed closely together by means of a sort of trowel. When the bone-black has been thus formed into a compact bed or stratum of about fifteen or eighteen inches in thickness, and Within five to ten inches fi om the top of the box, it is covered with another cotton cloth, and with another metallic plate pierced with holes, The object of the second cloth and metallic cover Is to collect any substances which would otherwise obstruct the interstices of tho superior stratnm. of the bone-black—an inconvenient accident which is easily prevented by the use of such a cover, and this cover is readily exchanged for another, should it be no mo itself obstructed. The superior covir is only of use when the previously described filtration through the cotton bag or leaf filter is omitted. 

To purify the product, 60 kg of moist PETN are thrown into 150 kg of acetone wanned to 50-55°C and stirred until completely dissolved. The solution is then filtered through a cotton cloth into a vessel filled with 150 1. of water. The precipitated pentaerythritol tetranitrate is centrifuged and dried in a special room for 22 hr at 55°C. 

Filter the PETN crystals out of the water using a clean piece of cotton cloth or filter paper. 

Filter the RDX crystals out of the mixture using either cotton cloth or paper towels. 

Filter the picric acid crystals out of the mixture by straining the mixture through filter paper or heavy cotton cloth. 

Put into a test tube a small splinter of wood, a scrap of filter paper, and a small piece of cotton cloth and pour over them a few cubic centimeters of concentrated sulphuric acid. 

White phosphorus dissolves easily in carbon disulfide (CSa). If such a solution is soaked into filter paper or cotton cloth and exposed to air, the highly volatile solvent evaporates readily and finely dispersed phosphorus residue bursts spontaneously into flame. Henley describes a magical act of igniting paper while breathing on it, which is based on this phenomenon. Addition of gasoline or toluene to the phosphorus solution delays the spontaneous ignition because of slower evaporation rate of the added vehicles. "... 

As mentioned earlier, UCFs process mainly natural uranium so that the presence, or operation, of a clandestine UCF may be difficult to identify by uranium analysis alone or even by isotopic composition measurements. However, the co-existence of uranium and fluorine in micrometer-sized particles can help recognize such an operation (Faure et al. 2014). SIMS methodology was used for this purpose on two real-life UF4 samples collected on filters and cotton cloth swabs in the purification and fluo-rination workshops and two CRM standards (CRM UF4 and CRM UOC) were used for calibration. In addition, two swipe samples, to which a relatively large amount of... 

Filtering material Paper towel or finely textured cotton cloth (shirt, sheet, etc.)... 

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