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Glass fiber are biologically inert, autoclavable and highly resistant to oxidizing agents and weak acids. Glass fiber can be used to extend the life of a final filter as a prefilter or they can be used alone for low cost sample clarification. Glass fiber without binders is designed for solvent filtration or gravimetric analysis to avoid binder extractables. These filters are primarily used as a prefilter to extend a final membranes' throughput and for filtering high dirt-containing aqueous solutions. Filters without binders are recommended for analytical and gravimetric determinations.
Prefilters increase the speed of the filtration process by trapping large particles before they reach the final membrane filter. Subsequently, filtration time is cut down and the frequency and cost of replacing membrane filters is reduced. For upstream protection of a membrane within a filter holder, the use of a prefilter that is slightly smaller in diameter than the main filter is recommended. The smaller diameter allows the prefilter to fit inside the O-ring or filter funnel holder seal, thereby ensuring a positive membrane seal. If used as the main filter medium, a prefilter with a diameter exactly the same size as the filter holder is recommended.
Glass fiber filters are classed as "nominal" rather than "absolute" filters. A glass fiber filter rated at 1 µm usually means that some percentage, for example 95%, of all particles of that size or greater will be retained by the filter.
Because of the high dirt-loading capacity of glass fiber filters, they are often used to protect membrane filters, giving a combination of excellent throughput and absolute retention.The news come from http://www.bossgoo.com/
