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U.S. Department of Health and Human Services

Recognized Consensus Standards

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Part B: Supplementary Information Sheet (SIS)
FR Recognition List Number 051 Date of Entry 01/14/2019 
FR Recognition Number 18-8
Standard
ASTM E2578-07 (Reapproved 2018)
Standard Practice for Calculation of Mean Sizes/Diameters and Standard Deviations of Particle Size Distributions
Scope/Abstract
1.1 The purpose of this practice is to present procedures for calculating mean s and standard deviations of distributions given as histogram data (see Practice E1617). The particle is assumed to be the diameter of an equivalent sphere, for example, equivalent (area/surface/volume/perimeter) diameter.

1.2 The mean s/diameters are defined according to the Moment-Ratio (M-R) definition system.2,3,4

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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5 This 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.
Extent of Recognition
Complete standard
Rationale for Recognition
This standard is relevant to medical devices and is recognized on its scientific and technical merit and/or because it supports existing regulatory policies.
Relevant FDA Guidance and/or Supportive Publications*
Guidance for Industry: Considering Whether an FDA-Regulated Product Involves the Application of Nanotechnology, Issued June 2014


Appropriate Use of Voluntary Consensus Standards in Premarket Submissions for Medical Devices - Guidance for Industry and Food and Drug Administration Staff, issued September 2018.
FDA Technical Contact
 Jiwen Zheng
  FDA/OC/CDRH/OSEL/DBCMS/
  301-796-3352
  jiwen.zheng@fda.hhs.gov
Standards Development Organization
ASTM ASTM International http://www.astm.org/
FDA Specialty Task Group (STG)
Nanotechnology
*These are provided as examples and others may be applicable.
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