Aluminium flake

Among other fillers of note are aluminium flakes [15], hybrid fillers — a mixture of flakes and fibers (Transmet Corp.) [14], mica coated with a layer of Ni (Martin Marietta) [14], etc. 

Almond shell Aluminium, atomized Aluminium, flake Aluminium-cobalt alloy Aluminium-copper alloy Aluminium-iron alloy Aluminium-lithium alloy Aluminium—magnesium alloy Aluminium-nickel alloy Aluminium-silicon alloy Aluminium acetate... 

Colour variable pigments in our Variocrom range are made of pi-large aluminium flakes which are covered by several layers of Si02 and Fe203, each a few hundred nanometers thick. This multi-layer plate-like structure produces an angle dependent, iridescent colour play. The Si02-layer with a... 

Acetoacet-4-phenetidide, 5.9, 680 atomised almninimn, 5.7, >1.36kbar/s aluminium flake, 8.6, >1.36kbar/s almninimn-cobalt alloy, 6.25, 748 aluminium-magnesium alloy, 5.85, 680 almninimn-nickel alloy, 6.5, 680 aluminium stearate, 5.85, 680 benzoic acid, 6.85, 700 2,2-bis(4-hydroxyphenyl) propane, 5.5, 803 calcimn silicide, 5.85, 1.36 kbar/s calcimn stearate, 6.6, >680 cellulose nitrate, >17.4, >1.42 kbar/s 2-chlorobenzyfidenemalononitrile, 6.1, >680 comnarone-indene resin, 6.3, 748. 

There are many kinds of composition, which cannot be distinguished from each other. To avoid errors due to this difficulty we must devise some method of separating them. For example, a white composition could be coloured by adding a small amount of dye to it a black composition could be mixed with a small amount of aluminium flake. When this is impossible, clearly label the container with details of the composition. 

Although electrically conductive plastics are not of very great economic significance at the present time, there are many specialised technical applications that would be unthinkable without these materials. Today they are mostly produced by incorporating conductive carbon-black in a variety of polymers, above all thermoplastic polymers. Other conductive additives (carbon fibres, steel fibres, aluminium flakes, metal coated carbon... 

Figure 3 Jetness variation with % reflection 4.3 Aluminium Flake Orientation...

A number of application test methods are discussed covering black jetness measurement, aluminium flake alignment and the usefulness of zeta potential is demonstrated in assessing dispersion stability. 

Pigments and dyes, including titanium dioxide, lead chromate, and aluminium flakes (which are used in aluminium paint syn. aluminium liquid to give a highly reflective metallic finish). 

Silberline Limited a UK compounder that specialises in pigments has found a range of applications for aluminium flakes beyond pigmentation. One of them is that such flakes, perhaps surprisingly, cause fire retardancy in polyethylene, polypropylene and polystyrene, have no effect in polycarbonates but accelerate combustion in polyamides. 

The use of microgels has been particularly successful in solvent-borne and water-borne metallic basecoats used in motor car production. Here the metallic visual effect requires viscosity control during the high film shrinkage that occurs on solvent evaporation, so that the metallic aluminium flakes align parallel to the substrate in the dry film. 

Composites with dispersed particles are not used only as load-bearing materials. Other uses include, for example, rocket propellants in which aluminium powder or other particles are dispersed to obtain a steady burning, and paints with silver or aluminium flakes to ensure electrical conductivity or excellent surface coverings. 

There is a considerable mismatch between the thermal expansion coefficients of metals and those of organic polymers. The metal particles can sometimes shrink away from the surrounding polymer as the temperature falls from the moulding temperature. Improved bonding between metal and polymers would be beneficial. It is possible to obtain filled plastics with thermal conductivities up to 95% of those of metals, simply by using high aspect ratio aluminium flakes. 

The most important metallic pigments are those based on finely-divided aluminium flakes. They may be used in plastics to simulate the colour of the metal or, in combination with transparent organic pigments, to produce novel metallic colouristic effects. Pre-dispersed preparations in... 

Epoxy mastics with aluminium flake pigments have very low moisture permeations and are popular both as spot primers or full coats. They can be formulated with weak solvents and thus can be used over old paint. The lack of aggressive solvents in mastics means that old paints wiU not be destroyed by epoxy mastics. This characteristic is needed for spot primers, which overlap old, intact paint at the edge of the spot to be coated. Mastics pigmented with aluminium flake are also used as full-coat primers. 

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