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Grade QMA Quartz Filter, circle, 8 × 10 in, numbered Grade QMA circles Highpurity quartz (SiO?) microfiber filters are used for air sampling in acidic gases, stacks, flues and aerosols, particularly at high temperatures up to 500° C and in PM10 testing. Because of the low level of alkaline earth metals, ''artifact'' products of sulfates and nitrates (from SO? and NO?) are virtually eliminated. QMA, sequentially numbered according to EPA standards, is suitable for most applications.

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