ASTM F1722-15(2021)

Standard Test Method for Determining Mass and Moment of Inertia of Alpine Skis

SIGNIFICANCE AND USE
4.1 This test method provides a means for determining the mass and moment of inertia of adult Alpine skis. It is not intended to evaluate data with regard to the quality of the ski.
SCOPE
1.1 This test method covers test measurement methods for mass and moment of inertia of adult Alpine skis.2  
1.2 No limitation to ski size is proposed. This test method is applicable to all adult Alpine skis.  
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.

General Information

• Status: Published
• Publication Date: 31-Jan-2021
• ICS: 97.220.20 - Winter sports equipment
• Technical Committee: F27 - Snow and Water Sports
• Drafting Committee: F27.30 - Skiing and Snowboarding Equipment

Relations

• Refers: ASTM F472-11 - Standard Terminology for Geometry of Alpine Skis
• Effective Date: 15-Jul-2011
• Refers: ASTM F472-92(2006) - Standard Terminology for Geometry of Alpine Skis
• Effective Date: 01-Oct-2006
• Refers: ASTM F472-92(1998) - Standard Terminology for Geometry of Alpine Skis
• Effective Date: 10-Aug-1998

Overview

ASTM F1722-15(2021): Standard Test Method for Determining Mass and Moment of Inertia of Alpine Skis provides a clear, internationally aligned method for testing two key physical properties of adult Alpine skis: mass and moment of inertia. Designed by ASTM International, this test method is intended for finished, manufactured skis without mounted parts and is applicable to Alpine skis of all adult sizes. By specifying measurement techniques and conditions, the standard ensures consistent, repeatable data that supports product development and comparative analysis in the ski industry.

Key Topics

• Scope of Application

  • Covers measurement methods for both the mass and moment of inertia of adult Alpine skis.
  • No limitations on ski size; the method applies universally to all adult Alpine ski lengths and geometries.
  • SI units (kilograms, meters) are used exclusively for reporting results.

• Test Method Fundamentals

  • Defines the mass of a ski as the weight of a finished, unmounted ski (in kilograms).
  • Defines the moment of inertia as the ski’s mass moment of inertia about its center of gravity (in kilogram-meters squared).
  • Requires ski samples to be conditioned in a standard atmosphere (20°C, 65% RH) prior to measurement, per ISO 554.

• Measurement Equipment and Validation

  • Specifies the use of precise weighing devices, fulcrums for center of gravity assessment, and time recording devices for oscillation period measurement.
  • Mandates validating measurement apparatus using standardized bars, ensuring accuracy and equipment reliability.

• Reporting Requirements

  • Results must detail reference to this test method, manufacturer’s name, model, nominal ski length, registration number, and any deviations or special conditions.

• Tolerances

  • Strict tolerances for mass (±0.02 kg) and moment of inertia (±0.02 kg-m²) are defined for meaningful data accuracy.

Applications

• Product Development and R&D

  • Allows ski manufacturers and designers to quantify the mass and moment of inertia of new models, optimizing performance characteristics for target user groups.
  • Ensures consistent metrics for evaluating effects of material or design changes.

• Comparative Testing

  • Facilitates direct comparison between different models and brands, supporting marketing claims and internal benchmarking.

• Regulatory Compliance and Certification

  • Alignment with international standards (ISO 6003 and ISO 554) makes this method suitable for use in regulatory submissions, quality control, and certification processes globally.

• Technical Documentation and Publication

  • Provides a standardized approach for reporting ski specifications in technical literature, product manuals, and marketing materials.

Related Standards

• ASTM F472: Terminology for Geometry of Alpine Skis
  Clarifies terminology related to ski measurement, ensuring consistency across standards.

• ISO 6003: Alpine Skis - Determination of Mass and Polar Moment of Inertia - Laboratory Measurement Method
  Provides a parallel international method, with which ASTM F1722 is aligned in significant aspects.

• ISO 554: Standard Atmospheres for Conditioning and/or Testing
  Defines environmental conditions necessary for repeatable and comparable physical property testing.

Practical Value

Adhering to ASTM F1722-15(2021) ensures reliable measurement of ski properties essential for performance optimization, safety analysis, and transparent communication with retailers and end-users. The standard supports harmonization in the global ski equipment industry, contributing to better product understanding and consumer confidence by providing accurate, comparable data on ski mass and moment of inertia.

Standards Content (Sample)

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.
Designation: F1722 − 15 (Reapproved 2021)
Standard Test Method for
Determining Mass and Moment of Inertia of Alpine Skis
This standard is issued under the fixed designation F1722; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 This test method covers test measurement methods for 3.1 Definitions of Terms Specific to This Standard:
mass and moment of inertia of adult Alpine skis. 3.1.1 mass of ski, m—the mass of a finished, manufactured
ski without any mounted parts, expressed in kilograms.
1.2 No limitation to ski size is proposed.This test method is
3.1.2 moment of inertia, I—the mass moment of inertia of
applicable to all adult Alpine skis.
theskiaboutitscenterofgravity,expressedinkilogram-metres
1.3 The values stated in SI units are to be regarded as
squared.
standard. No other units of measurement are included in this
standard.
4. Significance and Use
1.4 This standard does not purport to address all of the
4.1 This test method provides a means for determining the
safety concerns, if any, associated with its use. It is the
mass and moment of inertia of adult Alpine skis. It is not
responsibility of the user of this standard to establish appro-
intended to evaluate data with regard to the quality of the ski.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
5. Apparatus
1.5 This international standard was developed in accor-
5.1 Weighing Device, accurate to 60.02 kg.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5.2 Fulcrum, for locating the center of gravity of the ski.
Development of International Standards, Guides and Recom-
5.3 Time Measurement Device (stopwatch), accurate to at
mendations issued by the World Trade Organization Technical
least 0.1 s.
Barriers to Trade (TBT) Committee.
5.4 Measuring Device, in accordance with Fig. 1, consisting
of the following parts:
2. Referenced Documents
5.4.1 Clamping Device, A, consisting of two clamping
2.1 ASTM Standards:
fixtures. The top clamping fixture has a hole with a mark to
F472 Terminology for Geometry of Alpine Skis
locate the center of gravity and two additional holes at a
2.2 ISO Standards:
distance, d, from the center mark for fixation of the filaments,
f
ISO 554 Standard Atmospheres for Conditioning and/or
B. The recommended dimension for d is 75 mm, and the mass
f
Testing—Specifications
of the clamping device shall be less than 0.1 kg.
ISO 6003 Alpine Skis—Determination of Mass and Polar
5.4.2 Top Plate, C, with two holes separated by the distance
Moment of Inertia—Laboratory Measurement Method
2d for the fixation of filaments, B. The plate, C, shall be fixed
f
on a stiff, horizontal beam.
5.4.3 Two Filaments, B, with equal lengths, l, that connect
the top plate with the clamping device. The ratio d:l shall be
This test method is under the jurisdiction of ASTM Committee F27 on Snow f
and Water Sports and is the direct responsibility of Subcommittee F27.30 on Skiing approximately 1:40. With the recommended dimension d =75
f
and Snowboarding Equipment.
mm, and the length, l = 1000 mm. The filaments shall be made
Current edition approved Feb. 1, 2021. Published February 2021. Originally
of materials with low elongation and high strength (for
approved in 1996. Last previous edition approved in 2015 as F1722 – 15. DOI:
example, tennis racket string and fishing line). The diameter of
10.1520/F1722-15R21.
This test method is meant to conform in all significant aspects to the test
the filaments shall be not more than 1.0 mm.
method for determining mass and polar moment of inertia ofAlpine skis as set forth
in ISO 6003.
6. Sampling and Conditioning
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.1 In order to ensure comparability, it is recommended that
Standards volume information, refer to the standard’s Document Summary page on
one of the following ski sizes be used if the data measured are
the ASTM website.
tobepublished:150,165,or185cm.Theskisize,measuredby
Available from American National Standards Institute, 11 W. 42nd St., 13th
Floor, New York, NY 10036. chord length (see Terminology F472 for the definition of chord
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1722 − 15 (2021)
placed in the test device.Any vertical displacement of the steel
bar may alter calculation of the test device evaluation factor.
7.3 The theoretical moment of inertia, I , is calculated from
th
the following formula:
2 2
m a 1b
~ !
I 5 (1)
th
where:
a = length of the bar, m,
b = width of the bar, m, and
m = mass of the bar, kg.
7.4 Using this theoretical value and the measured value, the
test equipment validation factor, c, can be determined from the
following formula:
I
th
c 5 (2)
I
where:
I = theoretical polar moment of inertia, and
th
I = measur
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