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301.5 - Particle Count Materials (powder and suspension forms)

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 2806d is certified for particle concentration and projected area diameter. It consists of a polydisperse, irregularly-shaped mineral dust suspended in 5606 hydraulic fluid. RMs 8631b and 8632 are mineral test dusts of medium and ultrafine particle size and can be used to prepare suspensions in other types of oils. 

PLEASE NOTE: The tables are presented to facilitate comparisons among a family of materials to help customers select the best SRM for their needs. For specific values and uncertainties, the certificate is the only official source.


- Certified values are normal font
- Reference values are italicized
- Values in parentheses are for information only


Detail - Detail    Certificate - Certificate    Report of Investigation - Report of Investigation    MSDS - MSDS    Data Files - Data Files    Questionaire - Questionnaire


  SRM Description Unit Size     Particle Size Range

Detail Certificate MSDS 2806d
Now Selling
Medium Test Dust (MTD) in Hydraulic Fluid 3 x 400 mL   1.5 µm to 30 µm
Detail Report of Investigation MSDS 8631b
Now Selling
Medium Test Dust (MTD) 20 g   4 µm to 40 µm
Detail Report of Investigation MSDS 8632
Now Selling
Ultra Fine Test Dust (UFTD)
20 g   1 µm to 20 µm