CURRENT STATE OF PRODUCTS FOR CLEAN ROOMS ASSEMBLY
There is a consensus among the clean area technicians that Brazil is one of the leading countries in design and construction of these environments. The greatest proof of this concept is that the big works of the pharmaceutical industry – by far the largest clean room user – invariably rely on national companies to design and install these environments. And, as a decisive issue, these industries are certified by their American and European headquarters and institutes, since often part of the production is theirs, they are turned to foreign trade.
In this context, products and accessories intended for the construction of such environments, like doors, partitions, pass-throughs, ceilings and floors, should also accompany this excellence. And Brazilian manufacturers have been able to adequately meet demand. “It could not be any different. Customer industries are global and clean building products must deliver quality that is consistent with the requirements set by international standards, “says Raul Sadir, director of Public Relations at SBCC.
Even with the overall quality, there are certain discrepancies in the assessment of the present moment. Davison Rabecchi, director of TEP Engeneering, believes that all components of clean areas have continually evolved to mechanical and chemical resistance and also for productivity in assembly, although in this item there is still room for evolution, mainly to reduce time and the usage of the customer’s plant in the assembly stage. Already in the view of Eduardo Rein, from Reintech, between 2002 and 2005, few changes were observed. “Only last year there was a greater evolution with the use of the same basic materials, but with different construction characteristics. We have in the country concept and technology in manufacturing and assembly, but we still lack sub suppliers (steel sheets with vinyl coating and bactericides, such as beehives, among others) that allow us a more expressive leap. I am talking about the development of raw materials, and at this point the problem is unavailability of some of them, depending on the investment costs for research. But I have no doubt that we own the technical knowledge and creative ability to quickly fill that gap, “says Rein.
Based on the assumption that the efficiencies of cleanroom filters reach 99.99% for 0.3 micron particles, the constructive mode, the building materials used in the work, in addition to the circulating persons, processes and internal procedures , Are factors responsible for reducing internal contamination to clean rooms.
“Therefore, the components and the constructive way are decisive points in obtaining the cleaning parameters stipulated in the project”, analyzes Eduardo Rein. According to him, when it comes to the pharmaceutical industry, quality should be kept within the classes stipulated by ISO. The GMP concept or clean concept must be maintained, regardless of the cleaning class, so the constructive way has few changes. The major alterations refer to the production process, which incorporate various contamination control techniques. “However, when it comes to the microelectronics and space industry, the building materials will have their rigor increased in proportion to the need for cleaning.”
Davison José Rabecchi states that when it comes to a clean room its components must be designed within a design characteristic for the type of area. “For example, when working in a biosecurity environment in which pathogens (bacteria, viruses, among others) are handled, it is essential that the internal air in this environment does not move to adjacent environments. In order to do so, the project must minimize the risk of air leakage. In this case, the gaps between stops and doors should be minimal, with the sealing system, using silicone profiles and often inflatable devices through compressed air, which guarantees total tightness. The profile for the door and the door can also be double-sealed. ”
He also points out other points in the evaluation of products for clean areas, such as the interface between the floor and the door, because the lack of flatness of the floor allows a high leak through this gap. “This is one example of materials that also applies to pass-throughs. Ceilings are components that may have different mechanical resistance characteristics, especially when they act as technical floor, in which the joint system between the plates must meet the live load, for example, a technician walking on top of it, “he explains.
Jean Pierre Herlin, director of the SBCC, also comments on the development of panels made of rock wool. “In this case, there is a concern to meet the requirements required by insurers in relation to the use of non-combustible materials,” he says. Some companies have already presented panels with rock wool, with an interior structuring made with tubular profiles and extruded aluminum. Davison, of TEP, concludes by stating that in addition to the concern with the use of rock wool brains, it is also important to evaluate the techniques of fitting two panels. “The docking system shall prevent or delay the possible flame from passing from one environment to another”.
The debate is ample and exciting, but the important thing is that the set of products composed of doors, partitions, passage chambers, ceilings and floors guarantee the levels of thermal and acoustic insulation desired by the client and defined in the project.
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Solepoxy informs that the culture of resinous floors in Brazil is approximately 25 years old. Amongst its characteristics, floors must have high compressive, abrasion and chemical resistance, no seams or joints, half-cantilever skirting integrated into the floor (no seams), easy cleaning and maintenance, improved ambient light, higher adhesion in the substrate and lower index of physical contraction.
The company has several systems for each demand (mechanical, chemical, thermal and others). Usually Solepoxy works with epoxy resin based system, in addition to the paint line and coatings based on polyurethane resins, vinyl ester and methacrylic. They range from paints with a thickness of 300 microns, to high-performance coatings with a maximum thickness of 6 mm.
The “top of the line” product used in clean rooms is finished in polychromatic colored quartz crystals and is sealed by highly translucent resins. This finish is what defines the texture of the floor, and meets areas with requirements of classification of 100 ppm. It is also a high abrasion resistant floor.
Another solution presented by the company is a floor, composed of glass microspheres, which confers high resistance to abrasion (doesn’t scratch) in addition to high chemical resistance.
Alexis Joseph Steverlynck Fonteyne
ANAPRE vice president
Director of Solepoxy / Propiso