QM-A Quartz Air Sampling Filters, Whatman™ - 4.7cm circles - 1851-047

Microfiber filters for air sampling in acidic gases, stacks, flues and aerosols at temperatures to 500° C (932°F) high airflow, excellent retention ideal for PM-10 high-volume air sampling method. Ultrahigh-purity quartz. Low in alkaline earth metals, heavy metals. Virtually eliminate sulfate and nitrate artifacts.