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Polysiloxane Coatings

Polysiloxane Coatings Polysiloxane coatings are industrial protective and maintenance coatings that used in services characterized by abrasion, chemicals, extreme UV and high temperatures. The term polysiloxane refers to a polymer with a silicon-oxygen backbone. The silicon-oxygen backbone is much more resistant to the effects of UV radiation than the carbon-carbon backbone of organic polymers. Polysiloxanes have excellent aesthetic weathering attributes in terms of gloss retention and chalk resistance properties. They exhibit excellent abrasion and corrosion resistance, good chemical resistance, good anti-graffiti properties, resilience to dirt pickup and are formulated with low VOC‘s.  Advances in polysiloxane chemistry have resulted in the development of three major categories of this type of coating: Inorganic Polysiloxanes: Typical inorganic polysiloxanes cure by hydrolytic polycondensation. Formulated with the proper selection of additives and pigments, coatings can resist temperatures of approximately 1,400°F (760°C). Variation of pigment creates coatings with excellent solvent resistance. Epoxy-Polysiloxane Hybrids: Formulation with aliphatic epoxy resins, silicone […]

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Types of Maintenance Painting Surveys

Types of Maintenance Painting Surveys The purpose of maintenance painting is to preserve structures and equipment from premature failure and maintain them in appealing condition. There are three types of surveys that can be conducted to establish a maintenance painting program; minimal walk-through,mid-level and detailed maintenance painting survey. Minimal walk-through survey A minimal walk-through maintenance painting survey involves a subjective visual assessment of the overall condition of the coatings within a given area of the facility (lock, dam, public use area). The coatings within the areas are rated according to the painting needs of high, medium, or low priority, or some other qualitative rating scheme such as no coating work required, touchup only, or complete removal. When using a priority grading scheme, corrosion, process, contamination, safety, etc. all may be utilized as criteria. It may be helpful to conduct a quick walk-through of the facility to obtain an initial understanding of the range of coating conditions found […]

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Corrosion Control

Corrosion Control Everybody is familiar with the results of the corrosion on metals which are observable as red-brown or green-blue rust (iron oxide). The actual process of corrosion is less noticeable and research still conducted today for better understanding of the mechanisms and how to control it. Although corrosion engineers faced with a difficult challenge, there are several tools that can be implemented in the corrosion control designs, including: Design of Structure Corrosion Inhibitors Material Selection Cathodic Protection Alteration of the Environment Protective Coatings Design of Structure How a structure is designed can influence its resistance to corrosion. Generally speaking, corrosion control designs: Eliminate possible entrapment of water, chemical salts and other matter that could promote corrosion “hot spots”. Hot spots are areas particularly conducive to accelerated corrosion, and are often referred to as “critical areas”. Eliminate complex shapes like back to back angles and orientation of members that could […]

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Metallic Abrasives

Metallic Abrasives-Shot & Grit Abrasives The abrasive blasting materials is important because they determine the surface profile produced. Metallic  abrasives (shot & grit) are used primarily to blast clean steel and forged or cast iron where a surface profile is seldom critical on the finished product. Some examples of metallic abrasives include: Cast steel is a hard metallic abrasive used to remove scale and other hard surface deposits. Steel grit abrasives have irregular shapes and are effective in cutting away surface deposits or imperfections. Steel grit is expensive and is generally used only in recycling systems and when cheaper abrasives are unavailable. Because steel grit can be recycled, it reduces the overall waste stream. Steel shot is spherical; it can be produced accidentally as a byproduct or intention-ally for blast cleaning. Steel shot is good for heavy brittle deposits. Because of its spherical shape, it ricochets in enclosed areas and causes […]

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Polyurethane Coatings

Polyurethane Coatings Polyurethane coatings are one or two-package systems. For two-package systems, one component is an isocyanate and the other a polyol component. Because of the reactivity of the isocyanate, polyurethanes are moisture sensitive, and the gloss may drop when the wet film is exposed to high humidity. One component types cure with moisture supplied from the atmosphere. Polyurethanes are chemical reaction coatings and available in a variety of formulations; giving rise to a variety of properties from very soft polymers to very hard cast materials. There are two major types of polyurethane coatings: aromatic and aliphatic. Aliphatic polyurethanes are more resistant to UV attack and are typically used in exterior coating formulations. Aliphatic isocyanates, when used in the formulation of polyurethanes, provide coatings with excellent gloss and color retention. Aromatic polyurethanes are extremely tough and have better chemical resistance in immersion than aliphatic types, but chalks rapidly in sunlight. They […]

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