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  • ASTM F 50 : 2021

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    Standard Practice for Continuous Sizing and Counting of Airborne Particles in Dust-Controlled Areas and Clean Rooms Using Instruments Capable of Detecting Single Sub-Micrometre and Larger Particles

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  27-04-2021

    Publisher:  American Society for Testing and Materials

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    1.1This practice covers the determination of the particle concentration, by number, and the size distribution of airborne particles in dust-controlled areas and clean rooms, for particles in the size range of approximately 0.01 to 5.0 μm. Particle concentrations not exceeding 3.5 × 106 particles/m 3 (100 000/ft3) are covered for all particles equal to and larger than the minimum size measured.

    1.2This practice uses an airborne single particle counting device (SPC) whose operation is based on measuring the signal produced by an individual particle passing through the sensing zone. The signal must be directly or indirectly related to particle size.

    Note 1:The SPC type is not specified here. The SPC can be a conventional optical particle counter (OPC), an aerodynamic particle sizer, a condensation nucleus counter (CNC) operating in conjunction with a diffusion battery or differential mobility analyzer, or any other device capable of counting and sizing single particles in the size range of concern and of sampling in a cleanroom environment.

    1.3Individuals performing tests in accordance with this practice shall be trained in use of the SPC and shall understand its operation.

    1.4Since the concentration and the particle size distribution of airborne particles are subject to continuous variations, the choice of sampling probe configuration, locations, and sampling times will affect sampling results. Further, the differences in the physical measurement, electronic, and sample handling systems between the various SPCs and the differences in physical properties of the various particles being measured can contribute to variations in the test results. These differences should be recognized and minimized by using a standard method of primary calibration and by minimizing variability of sample acquisition procedures.

    1.5Sample acquisition procedures and equipment may be selected for specific applications based on varying cleanroom class levels. Firm requirements for these selections are beyond the scope of this practice; however, sampling practices shall be stated that take into account potential spatial and statistical variations of suspended particles in clean rooms.

    Note 2:General references to cleanroom classifications follow Federal Standard 209E, latest revision. Where airborne particles are to be characterized in dust-controlled areas that do not meet these classifications, the latest revision of the pertinent specification for these areas shall be used.

    1.6Units—The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.

    1.7This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazards statements, see Section 8.

    1.8This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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    Committee E 21
    Document Type Standard Practice
    Publisher American Society for Testing and Materials
    Status Current

    Standards Referenced By This Book - (Show below) - (Hide below)

    ASTM E 2217 : 2012 : R2019 Standard Practice for Design and Construction of Aerospace Cleanrooms and Contamination Controlled Areas
    ASTM E 1731 : 2011 : R2018 Standard Test Method for Gravimetric Determination of Nonvolatile Residue from Cleanroom Gloves
    ASTM F 1977 : 2004 : R2017 Standard Test Method for Determining Initial, Fractional, Filtration Efficiency of a Vacuum Cleaner System
    ASTM E 1548 : 2009 : R2017 Standard Practice for Preparation of Aerospace Contamination Control Plans
    ASTM E 1235 : 2012 : R2020 : EDT 1 Standard Test Method for Gravimetric Determination of Nonvolatile Residue (NVR) in Environmentally Controlled Areas for Spacecraft
    ASTM E 2042/E2042M : 2009 : R2016 Standard Practice for Cleaning and Maintaining Controlled Areas and Clean Rooms
    ASTM F 2299/F2299M : 2003 : R2017 Standard Test Method for Determining the Initial Efficiency of Materials Used in Medical Face Masks to Penetration by Particulates Using Latex Spheres
    ASTM E 1560 : 2018 Standard Test Method for Gravimetric Determination of Nonvolatile Residue From Cleanroom Wipers
    ASTM E 2352 : 2019 Standard Practice for Aerospace Cleanrooms and Associated Controlled Environments—Cleanroom Operations
    MIL-DTL-197N:2022 Packaging of Bearings, Associated Parts and Subassemblies
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