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Mining is the essential process of extracting materials from the earth. It dates back to prehistoric times when the earliest humans mined flint, copper and gold. These basic materials were then used for tools, weapons, currency. Today, there is a wide array of mined products from the extraction of valuable materials. Mining is a growing industry with many varied processes and system designs depending on the extraction requirements, processing techniques, and restoration of the land after a mind is closed.
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During the 72-year history of using high performance coating systems for pipe internal corrosion control, there has been a slow introduction of different resin chemistries that serve as the backbone of these coating systems. While phenolic resins systems were the primary starting point, it transitioned to include epoxies, novolacs, nylons, urethanes and others. As needs outside corrosion control like deposit mitigation and wear resistance arose, coatings based on other specialty resin chemistries, like from the fluoropolymer family, were developed.
Upon installation of a typical thin film coating system, extensive dynamic cracking was discovered in concrete chemical secondary containment structures. After multiple failed attempts to repair cracks using standard coating products, the decision was made to proceed with equipment installation in hopes of maintaining schedule while the coating details could be evaluated.
Selection of coating systems for commercial projects may appear to be a simple task, but to ensure a successful project the Architect or the Engineer needs to perform a thorough and appropriate evaluation of the project to match the right coating systems with the required substrates and environments.
The polyurea technology has been developed by Texaco chemical in the 80’s. First developed for the reaction-injection-molding (RIM), it has been adapted for spray application. The development in the spray equipment in the 90’s has enabled the commercialization of 100% solid polyurea spray elastomeric coatings.
This standard contains requirements for steel panels used to perform tests for evaluation of various performance characteristics of protective coatings applied to steel substrates. Panels meeting requirements of this standard may be used for tests including, but not limited to, natural and accelerated exposure in or out of the laboratory; tests to determine resistance to various chemicals, impact, and abrasion; and tests to characterize properties such as color, gloss, adhesion, and hardness. Requirements for steel composition, panel dimensions, surface preparation, ambient conditions for application and cure of coatings, and location and dimensions of scribes on coated panels are included.
An escalating amount of negative press on the tried-and-true polyurethane finish coats has arisen due to concerns with their free-isocyanate content. This paper explores performance aspects of polyurethanes with respect to their UV resistance properties, and safety issues associated with polyurethanes as a function of their precursor isocyanate molecules.
This standard for exposure testing of polymeric materials gives detailed information on procedures for conducting the "sequential absorption and desorption" test. Historical Document 1996
The search for environmentally friendly and greener materials in the polymer field is further explored to decrease dependency toward petroleum-based products. Sucrose soyate, a complex molecule of sucrose and fatty acids of soybean oils, provide an alternative renewable material for petroleum-based coating resins in addition to the already existing choice of drying oils
Vinyl Esters are highly chemical resistant polymers that provide an excellent foundation for the building blocks with which to line the interior of a Flue Gas Desulfurizatoin System. Understanding that vinyl ester systems cure through polymerization in order to provide the proper environment and achieve maximum results is necessary.