Semi-matte

Matting agents are used to produce coatings with a matt, semi-matt, or silk finish. They include natural mineral products such as talc or diatomites and synthetic materials such as pyrogenic silicas or polyolefin waxes. Matting can also be obtained by special formulations that exploit the incompatibility between binder components and their cross-linked structures. 

The disadvantage of this solution lies in the long surface hardening time. However, cure is complete in a few minutes if infrared heating and waxy additives are used and promoters, such as ethyl acetoacetate, CH3 CO CH2 C0 0-C2H5, are included to enhance the action of the cobalt. The allyloxy compounds also raise the cost of the finish. Nevertheless, this solution to air inhibition is generally preferred for matt and semi-matt clear and pigmented finishes. 

Satin Glaze, Satin-vellum Glaze or Vellum Glaze. A semi-matt glaze, particularly for wall tiles, with a characteristic satin appearance. Such glazes are generally of the tin-zinc-titanium type. 

Berlin Blacks n Low-cost form of air-drying blacks based on solutions of bitumens to which black pigments or fillers are added. They possess excellent opacity, but reduced gloss. Some Berlin blacks are semi matt. 

High density polyethylene offers superior resistance to acids and is used on chemical equipment or where a smooth semi-matt finish is required. 

Acrylic urethanes can also be modified with cellulosics, such as cellulose nitrate or CAB. The introduction of a lacquer drying component will speed up the tack free time of the system. They also extend the coating, reducing the solids at application viscosity and assist with the control of gloss in semi-matt systems. 

Properties of the deposits The deposits are generally similar to those obtained from conventional electrolytes, and are for the most part matt or semi-bright. 

A crack count of 30-80 cracks/mm is desirable to maintain good corrosion resistance. Crack counts of less than 30 cracks/mm should be avoided, since they can penetrate into the nickel layer as a result of mechanical stress, whilst large cracks may also have a notch effect. Measurements made on chromium deposits from baths which produce microcracked coatings indicate that the stress decreases with time from the appearance of the first cracks . It is more difficult to produce the required microcracked pattern on matt or semi-bright nickel than on fully bright deposits. The crack network does not form very well in low-current-density areas, so that the auxiliary anodes may be necessary. 

In semi-automatic moulding the operator may inspect each unit for features including colour, dispersion and uniformity of colour, standard and uniformity of gloss or mattness, and the presence or otherwise of defects like silver streaks or stringing. However, it is preferable if assessments can be made in numerical terms, expressed in units that may be compared quantitatively and subjected easily to statistical treatment and analysis. It is often convenient in the course of... 

In the Falconbridge furnace (5,6) it was found that the interface between slag and matte was rendered immobile, probably by the presence of solid chromites. In the Cominco electric furnace, semi-solid precipitates have also been found to be present at the slag/bullion interface therefore, as a first tqjproximation, the interface between slag and bullion was considered to be immobile. Consequently, both sides of the interface were treated as non-slip walls. With this boundaty condition, heat was transferred across the interface only by conduction. Therefore, continuity of the heat flux across the interface was prescribed. Similarly, for electrical power computation, continuity of magnetic vector potential. A, at the interflice was prescribed. 

Finish or top coat - the choice of this paint will depend on the degree of protection and the decorative effect required. Finishes can be smooth, gloss, semi-gloss, matt, eggshell or textured and are available in a wide range of colours. 

Highly filled interior paint, wash resistant Interior mat paint, rub resistant High quality interior Matt paint Semi-gloss interior paint... 

Uses Defoamer for use in matte and semi-gloss emulsion paints ind. latex masonry finishes, dispersion adhesives silicone-free Features Free from mineral oil and silicone oil exc. compatibility Properties Yel. cloudy liq. emulsifable in water dens. 0.85-0.90 g/cc flash pt. 

Uses Foam control agent in aq. coatings such as parquet lacquers, high gloss paints, matte paints, semi-gloss paints... 

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