Polyvinyl chloride filter

PRO-TEK Colorimetric Air Monitoring Badge System Polyvinyl chloride filter Silver membrane filter Silica gel tube... 

Particles were collected by drawing a known volume of air through a polyvinyl chloride filter with 5-p.M pore size. 

The filter holder, containing a 37 mm diameter, 5.0 micron pore size hydrophobic polyvinyl chloride filter,... 

Smith and Quinn (T ) supported cuprous chloride solutions in a relatively inert, porous polyvinyl chloride filter which was 190 pm thick. They were studying CO facilitated transport. 

Meiny different supports have been used to prepare ILMs Including cellulose acetate reverse osmosis membranes (1 6, 25, 29, ), micro-porous polypropylene ultrafiltration membranes (31-3 T7 polyvinyl chloride filters (35), and hollow fiber cellulose acetate reverse osmosis membranes T36). Way et al. ( ) discuss the chemical and physical properties that must be considered when an ILM support Is selected. 

Freeing a solution from extremely small particles [e.g. for optical rotatory dispersion (ORD) or circular dichroism (CD) measurements] requires filters with very small pore size. Commercially available (Millipore, Gelman, Nucleopore) filters other than cellulose or glass include nylon, Teflon, and polyvinyl chloride, and the pore diameter may be as small as 0.01 micron (see Table 6). Special containers are used to hold the filters, through which the solution is pressed by applying pressure, e.g. from a syringe. Some of these filters can be used to clear strong sulfuric acid solutions. 

The initial halogenated polymeric materials were obtained from the polyvinyl chloride-polyvinylidene chloride, PVC-PVDC (Rovil fiber) and chlorinated polyvinyl chloride, PVC. Dehydrochlorination was performed in the presence of a base solution in a polar organic solvent (dimethylsulfoxide, acetone or tetrahydro-furane). The products were filtered and extracted with water in a Soxhlet apparatus until all chloride ions were removed. Thermal treatment was performed in a tubular furnace in CO flow at 10 cm min". ... 

Reagents. Standards were prepared with 15 micron Mln-U-Sil quartz. The hydrochloric acid and isopropanol were analytical reagent grade. A 0.5% Aerosol OT solution was prepared by diluting a commercially prepared 25% Aerosol OT solution. Water was deionized and glass distilled. Filters used for redeposition were MSA, 0.5 micron, 37mm, polyvinyl chloride (PVC), membrane filters. The internal reflecting plate (crystal) was a Wilks and Barnes KRS-5 crystal, 52.5 x 20 x 2mm, with 45° ends. 

The BCD is very sensitive to phthalate esters, for example di(2-ethylhexyl) phthalate which is a common contaminant of blood stored in polyvinyl chloride containers (Fig. 1). The AFID can be made virtually specific for phosphorus-containing compounds, but retains its capability to detect phosphorus even when optimised for nitrogen compounds. The contaminant tri-isobutyl phosphate from filter paper is not apparent when using the FID, but produces the largest peak on the chromatogram with the AFID in the nitrogen mode (Fig. 2). 

Physical effects caused by polyethylene glycol bases include softening and liquefaction in mixtures with phenol, tannic acid, and salicylic acid. Discoloration of sulfonamides and dithranol can also occur and sorbitol may be precipitated from mixtures. Plastics, such as polyethylene, phenolformaldehyde, polyvinyl chloride, and cellulose-ester membranes (in filters) may be softened or dissolved by polyethylene glycols. Migration of polyethylene glycol can occur from tablet film coatings, leading to interaction with core components. 

Emulsion Polymerization Emulsions have particles of 0.05- to 5.0-pm diameter. The product is a stable latex, rather than a filterable suspension. Some latexes are usable directly, as in paints, or they may be coagulated by various means to produce very nigh-molecular-weight polymers. Examples are polyvinyl chloride and butadiene-styrene rubber. 

Use Plasticizer for polyvinyl chloride, polystyrene, nitrocellulose fire-retardant for plastics air-filter medium solvent mixtures waterproofing additive to extreme pressure lubricants hydraulic fluid heat-exchange medium. 

Pure polyvinyl chloride is the composition of PCU, produced in Germany, and of Rhovyl and Thermovyl, made in France. PCU loses its mechanical stability and shrinks considerably, due to the stretched molecules resuming their original configurations, at temperatures of 75 to 80 C. It compares unfavourably, therefore, with other synthetic fibres for textile uses. It has found certain specialized applications for making fishing lines, filter cloths, and sails. 

Air samples of the workplace should be taken using calibrated sampling pumps with cassettes that contain either mixed cellulose ester (MCE) or polyvinyl chloride (PVC) filters. There may be a number of country-specific statutory sampling requirements. The guide shown in Table 16.1 provides an overview of the effectiveness of control measures. 

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