Metallic flakes, powders

CEER cell Finishing Services Ltd Vertical plate Discontinuous via extraction of metal flake/powder from a sump port or cathode Yes ... 

Iron flake powder and polystyrene beads had been blended in a high-speed mixer. The mixture ignited and binned rapidly when discharged into a polythene bag. Rapid oxidation of the finely divided metal and/or static discharge may have initiated the fire. No ignition occurred when the iron powder was surface coated with stearic acid. 

Metallic Pigments. These pigments are metal flakes of various sizes made up of aluminum, copper, zinc, and/or their alloys. The aluminum flakes develop the silver metallic colors, whereas the copper, zinc, and aluminum alloys produce the gold, copper, brass, and bronze colors. The metal effect is modified, not only by shape and size, but also by perticle size distribution within a given product. Since aluminum, in particular, as a fine dry powder, can form explosive mixtures with air, most of these materials are commercially available in paste or liquid concentrates. In addition, surface treatments of these materials enhance their appearance and performance. Flakes of other metals, such as stainless steel, are used for surface protection purposes such as corrosion resistance and electrical conductivity. 

In the so-called bonding-process , the metallic flakes are thermally and mechanically bonded to the surface of the resin powder, avoiding separation in the overspray and thereby giving problem-free reuse of the material. Furthermore there are optical advantages in bonded metallic powder coatings due to the very homogeneous distribution of the metallic flakes. 

Available forms Structural shapes of all types, plates, rods, wire foil flakes, powder (technical and USP). Aluminum can be electrolytically coated and dyed by the anodizing process (see anodic coating) it can be foamed by incorporating zirconium hydride in molten aluminum, and it is often alloyed with other metals or mechanically combined (fused or bonded) with boron and sapphire fibers or whiskers. Strengths up to 55,000 psi at 500C have been obtained in such composites. A vapor-deposition technique is used to form a tightly adherent coating from 0.2 to 1 mil thick on titanium and steel. 

Many fillers play a prominent role in brake pads and clutch linings. These include fibers such as aramid, glass, carbon, steel, and cellulose low cost fillers such as barites, calcium carbonate and clay frictional modifiers such as alumina, metallic flakes and powders. The combination of these materials with binders gives a broad range of brake pad materials. 

The sorption properties (both at equilibrium and in kinetic terms) are controlled by many parameters related to (1) solution chemistry (i.e., pH, metal concentration, composition of the solution, and more specifically presence of ligands) or (2) polymer characteristics (i.e., particle size, porosity, pore size, conditioning, etc.). The comparison of experimental data in the abundant literature is thus difficult since experimental conditions are not systematically fully described. These biopolymers are poorly porous under their raw form (flakes, powder) [112],... 

Cl 77860 Cl Pigment metal 5 EINECS 231-141-8 HSDB 5035 Metallic tin Silver matt powder Tin Tin, elemental Tin flake Tin, inorganic compounds (except oxides) Tin, metal Tin powder Wang Zinn. Element Used In manufacture of tin plate, anodes, corrosion-resistant coatings, manufacture of chemicals, mp = 232° bp= 2507° d 7.31. Atomergic Chemetals Cerac M T Harshaw Noah Cham. ... 

PHYSICAL PROPERTIES Steel-gray metallic pieces, powders and flakes strong and varied colors soluble in acids (except nitric) and strong alkalies chromium 111 compounds are sparingly soluble in water chromium IV compounds are readily soluble in water MP (1890°C) BP (2672°C) VP (1 mm Hg at 1616 = C) VD (7.1 g/cm ) HV (81.7 kcal/g-atom) HF (3.5 kcal/g-atom). 

HAZARD RISK Highly explosive when shocked or exposed to heat or by chemical reaction undiluted liquid and concentrated solutions may explode violently, especially id impurities are present may explode on heating to 100°C or on tough glass surfaces explosive with alkali metals copper powder causes active decomposition with the evolution of nitrogen and the formation of insoluble white flakes of polymethylene decomposition emits highly toxic fumes of NOx NFPA code not available. 

The major sources of dilute, metal ion liquors are identified within the metals production/processing and chemical industries. Problems associated with traditional methods of metal ion removal are highlighted and the developing role of electrochemical techniques is discussed. Electrode and cell reactions are illustrated via typical examples from laboratory and industrial practice. The need to select an appropriate cell design and to control the reaction conditions is emphasised via consideration of the problems caused by secondary reactions. Important design criteria for electrochemical reactors are summarised. Available reactors are classified according to the nature of the product which may be metal flake or powder, a metal deposited onto a disposable substrate, a metal ion concentrate or an insoluble metal compound. The applications for electrochemical techniques in environmental treatment are illustrated by examples which show features of reactor construction and their typical performance. Current trends are summarised and recommendations are made for further work in critical areas. 

Synonyms/Trade Names Metallic tin, Tin flake, Tin metal. Tin powder ... 

Products and Uses Applications include fine metallic flakes or powder in paint, powder cosmetics, hair coloring, pearl finish eye shadow, cosmetics, and decorative art materials. 

Some fillers impart specialist secondary functions to the polymer. Glass in the form of fibres, flakes and hollow microbaUoons or microspheres has been used to fill polymers (Walker and Shashoua, 1996). Metal flakes or powdered metals are used as fillers in electrically conductive plastics, which are used to overcome electromagnetic interference in office equipment. Carbon-filled polymers are good conductors of electricity and heat. 

Another factor that influences the value of pc is the aspect ratios of the metallic filler. Metal fibres, metal-plated glass fibers, and metal flakes can significantly lower the concentration required to achieve isotropic conduction as compared to spherical powders [3]. Values of pc as low as 1 vol % have been reported with stainless steel fibers having an aspect ratio of 750 [37]. 

CAS 7429-90-5 EINECS/ELINCS 231-072-3 UN 1309 (DOT) UN 1396 (DOT) UN NA 9260 INS173 El73 Synonyms Aluminium Aluminum bronze Aluminum dehydrated Aluminum flake Aluminum metal Aluminum powder (INCI) Cl 77000 Pigment metal 1... 

Many substances and formulations have been investigated as fingerprint powders (e.g., carbon black, graphite, metal oxides, sulfates, and carbonates), but the most sensitive powder for general use is considered to be aluminum flake. Aluminum flake powder, because of the flat plate-like structure of each particle and a surface layer of stearic acid, adheres particularly well to a latent fingerprint deposit. In addition, its hardness and reflectivity aid in the photography and transfer of developed prints. 

Amorphous silica n. Si02. A naturally occurring or synthetically produced pigment, characterized by the absence of pronounced crystalline structure, and which has no sharp peaks in its X-ray diffraction pattern. It may contain water of hydration or be an anhydrous type. It is used as an extender pigment, fatting agent, and as a desiccant in metal flake and metal powder coatings. 

Opacified evacuated powders - Contain metallic flakes to reduce radiation conform to irregular shapes. 

Metal-fiUed polymeric filaments. In the filament production process metal flakes or metal powders are added. 

A third type of gasket is the conductive-impregnated elastomers. In this configuration, the conductive materials are metal flakes or powder dispersed throughout the carrier. This gasket and some of its applications are shown in Fig. 11.41. 

Another material for achieving shielding is called composites. Here the plastic material is impregnated with flakes or powder of a metal such as copper or aluminum. Early versions were not particularly successful since it was difficult to homogeneously deploy the filler without developing leakage spots or clumps of the metal flakes. This lead to making the composites into multilayers of sheet material to be formed around a mold. 

The total behaviour of the sample is determined by the largest resistance. In highly doped samples this will be the resistance from fibre to fibre (/ 3.4) or across grain boundaries found in, for example, the non-fibrillar Durham Graz material. This type of internal contact resistance is well known from metal powders, sputtered metal layers, and polymers compounded with carbon black or metal flakes. Theories of fluctuation-induced tunnelling have been developed to describe this case [83-84]. They show that at finite temperatures the barriers between the individual particles are modulated by statistically fluctuating potential differences. 

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