Opaque plastics

Many silver compounds are unstable to light, and are thus shipped ia brown glass or opaque plastic bottles. Silver compounds that are oxidants, eg, silver nitrate and iodate, must be so identified according to U.S. Department of Transportation (DOT) regulations. Compounds such as silver cyanide, which is toxic owiag to its cyanide content, must carry a poison label. However, most silver compounds are essentially nontoxic. 

These are usually self-adhesive, precut, printed patterns on a substrate that are simply adhered to the surface of a product. Decals generally use a transparent plastic film while labels are usually on an opaque plastic, metallic and multilayer sandwich base. Labels of sufficient thickness are useful for hiding unavoidable appearance problems such as gate and sprue removal areas, sink marks, blushes, splays, and weld lines. 

Any of a number of plates containing a series of wells in which to store reagents, clones, etc., or perform individual assays. Typically, these plates are constructed of a variety of clear and opaque plastics, and contain 96, 384, or 1,536 individual wells, although 24-well and 3,456-well plates are also available. 

Zinc oxide (ZnO) is widely used as an active filler in rubber and as a weatherability improver in polyolefins and polyesters. Titanium dioxide (TiOj) is widely used as a white pigment and as a weatherability improver in many polymers. Ground barites (BaS04) yield x-ray-opaque plastics with controlled densities. The addition of finely divided calcined alumina or silicon carbide produces abrasive composites. Zirconia, zirconium silicate, and iron oxide, which have specific gravities greater than 4.5, are used to produce plastics with controlled high densities. 

Recently Eliasson and Matousek [26, 62] demonstrated that SORS can provide a chemical signature of the internal content of opaque plastic containers. This is demonstrated in Fig. 3.11 for aspirin tablets held inside an opaque (white) plastic pharmaceutical bottle (1.3mm thick). The conventional Raman signal is overwhelmed by the Raman component originating from the container wall and is consequently ineffective in determining the contents of the bottle. In contrast, the SORS method using a scaled subtraction of two SORS spectra measured at different spatial offsets yields a clean Raman spectrum of the tablets inside the bottle. SORS has also been used in the detection of counterfeit anti-malarial tablets by Ricci et al. [63] the chemical specificity of Raman spectroscopy readily distinguished between genuine and fake tablets and identified the content of the counterfeit tablets. 

Dyclonine hydrochloride pH (2.0 and 4.0), and assay Collapsible, opaque plastic tubes or in tight, light-resistant glass containers... 

A container containing 50 kg of Ca(OCl)2 is stored in an opaque plastic container. It had been stored outdoors for quite some time and then used to disinfect a swimming pool. How effective is the disinfection What material is used instead for the disinfection And how many kilograms is it ... 

J,m pore-size capsule filter. Samples analyzed for cations were acidified to a pH of about two in the field with ultra pure HNO3. Samples for analysis of nitrogen species and phosphate were collected in opaque plastic bottles and chilled to about 3 °C. Urrfiltered samples also were collected, primarily for analysis of arsenic and iron. 

Applying Liquid bleaches containing sodium hypochlorite are often sold in opaque, plastic containers because sunlight causes the compound to decompose to produce oxygen gas and sodium chloride. Write the balanced chemical equation for this reaction. 

TPX is another relatively new plastic which was commercialised in 1968. It is an olefmbased resin with the lowest density of the plastics (0.83) but a high melting point of 240°C, which makes it a high-temperature-resistant plastic. Methylpentene can be a crystal clear or an opaque plastic. It is highly permeable to moisture and gases. 

Then swirl well and pour the brew into a coffee filter in a glass, opaque plastic or metal funnel. When the dripping stops, take out the fitter and gently squeeze out the remainder ci the acetone. Sp d the fitter on a newspaper and let it cb. ... 

This reaction accounts for a major part of the chlorine consumption in outdoor swimming pools. It is the reason why bleach is sold in opaque plastic bottles and it should be the reason that you should never buy bleach in a clear bottle "on sale" from your neighborhood supermarket, that is, unless you are interested in purchasing a bottle of salt solution. 2. Reactions with Inorganics. The reactions between chlorine and reduced inorganic compounds (e.g., Mn(II), Fe(II), NOa", S(—II)) are usually rapid. Thus when chlorine is used to oxidize ferrous iron to ferric iron, for example, in groundwater treatment, the reactions. 

In Fig. 4 an opaque plastic sample holder (H) whose 0.5-mm thick base contains a 3 mm wide x 10 mm long slit (S), positions the bottom of a 13 mm I.D. x 45 mm glass vial at 1.5 mm above the top surface of a Verlauf B-60 wedge interference filter (F) (60 mm long x 25 mm wide x 3 mm thick Schott Optical Glass Co., Inc.). The filter is mounted in a 3-mm thick filter holder which slides horizontally 1 mm above the photocathode of an EMI 9789 QB phototube (effective diameter of photocathode 10 mm). The total distance from the bottom of the solution in the glass vial to the photocathode is 6 mm. A synchronous motor rotates a screw drive which in turn drives the... 

Laser-ionization mass spectrometry A technique for chemical analysis of transparent and opaque plastics, capable of detecting all the elements but hydrogen and helium. 

Initially transparent and flexible, but changed into hard strong opaque plastic. Opaqueness to transparency was thermally reversible Opaque, softish, material... 

Although polymers excluding light or colored or opaque plastic material are preferable to protect the oils from light oxidation, clear plastic containers are generally used because of consumer preference. Ultraviolet absorbers have been used in PET bottles for oil to reduce rates of photooxidation. The additive... 

An organic marker system which can be added to a polymer molecule has been developed by Eastman Chemical. The company claims to have demonstrated the feasibility in the laboratory, but there is much more work needed to develop a commercial application. If successful, it is envisaged that such a marker would provide a relatively economical means of identification and therefore separation of different types of plastics, which could be operated on a continuous industrial scale. The system is said to work both with transparent and opaque plastics. 

Appearzince highly crystalline opaque plastics crystalline opaque plastics clear rubber clear rubber clear rubber... 

Starch before calendering. Most photographic papers for color prints are extrusion coated with an opaque plastic fihn (e. g. polyethylene) to improve the impermeability. 

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