Ahlstrom standard qualitative filter papers are suitable for quadrant folded or gravity flow applications. These grades contain a high-level of alpha-cellulose that provides high purity but will weaken when wet. Not recommended for use in vacuum work or when wet handling is required. Maximum ash content is 0.012 percent. Number 615 is a fast filtering grade. It has a rough surface and is used for filtering aluminum, ferric, and magnesium hydroxides. It is also found in general construction filtration work and in the filtration of insoluble iron and ore. Retention: 25.0 micrometers. Speed: 235 milliliters per minute.
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