ASTM D8002 - 15e1

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

    Active Standard ASTM D8002 | Developed by Subcommittee: D19.08

    Book of Standards Volume: 11.02


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    Significance and Use

    5.1 This test method is an alternative for the silt density index (SDI) method (Test Method D4189) with the aim to overcome inaccuracies related to a nonlinear relation with the fouling potential due to particulate matter concentration, absence of temperature correction, support pad, and time.

    5.2 The MFI-0.45 can serve as a useful indication of the quantity of particulate matter.

    5.3 The MFI-0.45 can be used to determine effectiveness of various processes such as filtration or clarification used to remove particulate matter.

    5.4 The MFI-0.45 has empirically been correlated with fouling tendency of some water treatment equipment such as reverse osmosis (RO) devices.

    1. Scope

    1.1 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 The values stated in SI units are to be regarded as 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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D1129 Terminology Relating to Water

    D1193 Specification for Reagent Water

    D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water

    D3370 Practices for Sampling Water from Flowing Process Streams

    D4189 Test Method for Silt Density Index (SDI) of Water

    D6161 Terminology Used for Microfiltration, Ultrafiltration, Nanofiltration and Reverse Osmosis Membrane Processes

    D7726 Guide for The Use of Various Turbidimeter Technologies for Measurement of Turbidity in Water


    ICS Code

    ICS Number Code 13.060.70 (Examination of water for biological properties)

    UNSPSC Code

    UNSPSC Code


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D8002-15E01

    Citation Format

    ASTM D8002-15e1, Standard Test Method for Modified Fouling Index (MFI-0.45) of Water, ASTM International, West Conshohocken, PA, 2015, www.astm.org

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