1 ZACLON LLC. Technical Information Zacsil . ZACLON potassium silicates Product Overview This increases viscosity, and can even lead to ZACLON potassium silicates (trade name complete gelation of the silica portion. Zacsil ) are a group of products with properties that vary with the ratio of silica to Advantages Over Sodium Silicate potassium oxide. They are designed to meet Although potassium silicate has properties the requirements of a wide range of end and uses similar to those of sodium silicate, uses. Products are available as water certain differences offer advantages in many solutions or in solid form as glass-like flakes. uses, forming a basis for selecting potassium The Chemical Abstracts index name for silicate in place of sodium silicate.
2 potassium silicate is silicic acid, potassium salt and the CAS Registry Number is 1312-76- 1. Solubility Zacsil potassium silicates are more soluble than sodium silicates of equal levels of Chemical and Physical Properties alkalinity, Making blends with potassium potassium silicate glass is a colorless super- silicate more life-cycle stable, more rinsable, cooled melt of potassium carbonate and pure and offers the potential for higher silica sand. It is slightly hygroscopic, but will concentration formulations. remain free flowing if stored in the original unopened drum. potassium silicate glass dissolves more rapidly than sodium silicate glass of equal potassium silicate solutions are prepared by molar silica-to-alkali ratio.
3 potassium dissolving potassium silicate glass in hot silicate glass can be dissolved in atmospheric water. By varying the silica-to- potassium dissolvers, whereas pressure dissolvers are oxide ratio, products of definite but widely generally used for sodium silicate glass. different properties are produced. Viscosity is a function of the silica-to- Temperature Resistance potassium oxide ratio, or alkalinity, and the potassium silicates offer higher temperature solids content: as either of these variables resistance for insulation applications, up to decreases, the viscosity is reduced. Viscosity 100O F or 50O C higher than sodium silicates.
4 Is also a function of water content of the This also applies to inorganic coating solution (relatively small changes in water temperature stability as well, such as content have a marked effect on viscosity) inorganic zinc coatings. and of solution temperature. The pH of potassium silicate is a function of both Low Efflorescence composition and concentration. Sodium silicates tend to react with atmospheric carbon dioxide to form A good way to think of potassium silicate carbonates and become progressively less solution is as a polymer solution of SiOx-SiOx water-soluble. potassium silicate films are oligomers, stabilized by the K2O (another less likely than sodium silicate to develop a way to express KOH:H2O).
5 So when altering carbonate bloom or white efflorescent coat the pH, for example, removing or of alkali carbonate. neutralizing too much of the KOH will cause rapid development of large chains of SiOx. Warning Zacsil potassium silicate can cause skin and eye burns or irritation. See Personal Safety and First Aid on page 4. Lower Tack which binds in an erratic, uneven manner. Zacsil potassium silicate solutions are not as The very high purity of Zacsil E200 insures sticky or tacky as sodium silicate solutions that each phosphor will emit the desired and are therefore easier to handle and use. color without influence by contaminants. Cleaning Compounds and Corrosion Uses and Applications Inhibition Welding Rods The superior solubility and compatibility of potassium silicate is specifically potassium silicate with surface-active agents, recommended as a binder for consumable solvents, electrolytes and diluents give the electrodes ( stick rods ) which are used with formulator a wider choice than permitted alternating current welding machines.
6 Along with sodium silicate. potassium silicate with good binding properties, Zacsil enhances the wetting and cleaning properties potassium silicate serves as a fluxing of soaps and detergents. Liquid cleaners component and produces a steady hot arc, that show excellent storage stability can be with lower arc voltage than sodium silicate, compounded with potassium silicate. In which tends to sputter or extinguish. Higher addition, the silicate ion has marked tensile strength and less elongation of weld anticorrosion properties to protect metal metal can be obtained. potassium silicate surfaces, and potassium silicate can be finds use as a binder in welding rods for mild, effective as a corrosion inhibitor in non- low-hydrogen, and stainless steel.
7 Zacsil cleaning applications as well. 865 grade, available in glass or solution form, represents an excellent balance of potassium Catalyst Support for a uniform arc and silicate for binding and Silica supports for catalysts can be prepared fluxing. with potassium silicate or sodium silicate via formation of a gel with acid. Catalyst Electronic Applications preparation typically requires prior analysis potassium silicate is almost universally used of many processing variables; the choice to settle and bind phosphors to the face of between potassium silicate and sodium black and white television picture tubes, as silicate will depend on the nature of the well as color projection TV tubes.
8 Zacsil catalyst desired, and on the comparison E200 grade is produced from high-purity raw between the effects of the respective materials for this application, and other cations, K+ or Na+, on the finished product. electronics applications needing ultra-high Note that in general, K+ ions are more purity. soluble and thus easier to rinse out in most These phosphor screens are prepared by of the salts it forms. mixing the phosphor with an electronics- grade potassium silicate solution and Mortars introducing this mixture into a clean tube Zacsil potassium silicate solutions show a filled with a dilute electrolyte solution such high value-in-use as a binder in mortars as strontium silicate.
9 A gel forms around the which must withstand acidic conditions other individual phosphor particles, which then than hydrofluoric acid. In particular, settle to the bottom of the tube. potassium silicate should be considered where sodium silicate in mortars shows The strength of the phosphor-to-glass bond is limited durability. Mortars prepared with a function of the concentrations of silica, potassium silicate show less tendency than potassium oxide, and electrolyte, as well as sodium silicate mortars to stick to the trowel of trace irons, water purity, settling time and have more body (thixotropy) to hold and temperature. bricks in place before setting permanently.
10 Compatibility is excellent with the wide Mortars containing potassium silicate will range of phosphors. Uniform films are withstand higher temperatures than those obtained in contrast to sodium silicate, containing sodium silicate will. This favors its use in refractory cement. Silicate mortars siliceous deposit closes the pores to make also show excellent acid resistance. the concrete surface less permeable to oils and other liquids, and can also act as an Oil-Gas Drilling anti-dusting compound. An environmentally acceptable alternative to The non-blooming characteristic of potassium oil-based drilling fluids. potassium silicate- silicate also accounts for its excellent based drilling fluids provide oil-like shale performance as a binder in roofing granules.