ASTM WK45948

    New Test Method for Modified Fouling Index (MFI-0.45)of Water

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    Developed by Subcommittee: D19.08 | Committee D19 | Contact Staff Manager


    1. Scope

    This test method covers the determination of the modified fouling index (MFI) of water measured at constant pressure. This test can be used to indicate the fouling potential of reverse osmosis/nanofiltration (RO/NF) feed water due particulate matter and is applicable to low and high turbidity waters. Since the size, shape, and nature of particulate matter in water may vary, this test method is not an absolute measurement of the quantity of particulate matter. 1.2 This test method is not applicable for reagent-grade water Types I, II, and III of Specification D1193 or effluents from most reverse osmosis and ultra-filtration systems. 1.3 UnitsThe values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    This test method has been developed over the past 25 years for use in Europe; the silt density index (SDI) is the current method used in the USA. The addition of a new method will provide the water industry with a much needed supplemental test method and allow for ASTM to provide for both SDI and MFI testing methods. The acceptance of this standard will also end the 25 year struggle to change the SDI method in its entirety.


    silt density index; synthetic membrane processes; pre-treatment indices

    The title and scope are in draft form and are under development within this ASTM Committee.

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    Work Item Status

    Date Initiated:

    Technical Contact:
    Steven Duranceau


    D19 (15-01)

    Ballot Item Approved as D8002-2015 and Pending Publication