ISO 7139:2017 PDF

Cross-country skis — Determination of elastic properties

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Title (English):

ISO 7139:2017

Cross-country skis — Determination of elastic properties

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 8
Publication date:: December 5, 2017
Edition:: ISO IS 7139 edition 2 version 1
ICS:: 97.220.20

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Description (English):

ISO 7139:2017 specifies laboratory measurement methods to determine the elastic properties of cross-country skis. Its purpose is to calculate the resistance of defined parts of the ski to bending. ISO 7139:2017 applies to cross-country skis with a nominal length greater than or equal to 150 cm. The standard measurement procedures can be used to ensure comparability between laboratory measurement data, determined and published by ski manufacturers, institutions or others. In ISO 7139:2017, no attempt is made to relate the measurement data to the quality of the ski

Technical details

Technical committee: ISO/TC 83/SC 4 - Snowsports equipment
SKU: ISO 7139:2017

Abstract

Overview

ISO 7139:2017 - "Cross-country skis - Determination of elastic properties" defines standardized laboratory methods for measuring the elastic (flexural) properties of cross‑country skis. The standard specifies how to determine the resistance to bending of defined parts of a ski (central section, tip and tail) for skis with a nominal length ≥ 150 cm. Its objective is to ensure comparable, repeatable laboratory measurement data published by manufacturers, test labs or research institutions. ISO 7139:2017 does not attempt to link measured values to overall ski quality.

Key topics and technical requirements

Scope: Applies to cross‑country skis with nominal length ≥ 150 cm; recommended reporting sizes: 150, 180, 200 cm.
Test regions: Central section stiffness (cM), tip/stem stiffness (cS), tail stiffness (cR).
Apparatus (high level):
- Two low‑friction rollers (20 mm diameter) on adjustable supports (separation 750–1 050 mm) for central bending; one roller support can fix the ski end.
- Fixation jaw and three clamps for tip/tail tests (per ISO 5902:2013).
- Load application devices with specified accuracy (±5 N for central, ±2 N for tip/tail) and a linear deflection measurement device accurate to ±0.5 mm.
Test procedure highlights:
- Condition skis for at least 2 h at (20 ± 2) °C and (65 ± 1) % relative humidity.
- Central bending: supports set at 0.5 × nominal length (lN); apply 10 N preload, then 250 N quasi‑static load; measure deflection 2–5 s after loading. Quasi‑static means flexion speed

Related standards

Mentioned in the description and other ISO standards

Overview

Key topics and technical requirements

Scope: Applies to cross‑country skis with nominal length ≥ 150 cm; recommended reporting sizes: 150, 180, 200 cm.
Test regions: Central section stiffness (cM), tip/stem stiffness (cS), tail stiffness (cR).
Apparatus (high level):
- Two low‑friction rollers (20 mm diameter) on adjustable supports (separation 750–1 050 mm) for central bending; one roller support can fix the ski end.
- Fixation jaw and three clamps for tip/tail tests (per ISO 5902:2013).
- Load application devices with specified accuracy (±5 N for central, ±2 N for tip/tail) and a linear deflection measurement device accurate to ±0.5 mm.
Test procedure highlights:
- Condition skis for at least 2 h at (20 ± 2) °C and (65 ± 1) % relative humidity.
- Central bending: supports set at 0.5 × nominal length (lN); apply 10 N preload, then 250 N quasi‑static load; measure deflection 2–5 s after loading. Quasi‑static means flexion speed

ISO 7139:2017 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

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