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NIST RM 8631a Medium Test Dust (MTD)
      
Product Description
 

These SRM and RM materials are intended for use in calibrating the response of particle sizing instrumentation, including optical counters, in accordance with National Fluid Power Association(NFPA) and ISO standard methods (NFPA/T2.9.6 R2-1998, ISO/FDIS 11171, ISO/FDIS 12103) for determining particle contamination in oils.

SRM 2806a is certified for particle concentration and projected area diameter. It consists of a polydisperse, irregularly-shaped mineral dust suspended in 5606 hydraulic fluid.

RMs 8631 and 8632 are mineral test dusts of medium and ultrafine particle size and can be used to prepare suspensions in other types of oils.

NOTE: The same lot of medium test dust was used to produce SRM 2806 and RM 8631, and is a derivative of Arizona Road Dust.

 
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