Ahlstrom MK360 is a binder-free grade made of extremely pure micro-quartz fibers and conditioned by high temperature pre-heating. MK360 is useful for testing hot "stack" gases as the quartz fibers can withstand temperatures up to 900°C. In addition, micro-quartz is used in liquid filtration when the highest purity media is required. With excellent filtration properties and minimal traces of metals and minerals, quartz fibers are dimensionally stable and can be used in the analysis of acidic gases with the exception of hydrofluoric acid.