This specification covers the determination of the release characteristics of alpine and alpine touring bindings. This specification is applicable to alpine and alpine touring bindings that have safety release mechanisms. Specifically, this performance standard establishes the minimum performance requirement for various release scenarios.
Keywordsbindings; alpine touring; release mechanism
ASTM F504 Standard Test Method for Measuring the Quasi-static Release Moment of Alpine Ski Binding specifies the application of both a moment of couple (F504-1.1 and F504-2.1) and moment of force (all other specified tests). The kinematic axis of rotation of the boot/binding system during release affect the release moment transmitted to the lower leg by the boot/binding system when the applied load is a moment of force. All ISO 9462 and ISO 13992 tests only apply a moment of couple (both method A and method B). A load almost never applied during skiing. ISO 9462 and ISO 13992 tests do not provide for the application of a moment of force. Thus, any measurement of release moment by ISO binding test methods is independent of the kinematic pivot axis of the boot/binding system. ASTM F504 provides for the application of both a moment of force and a moment of couple and is therefore a superior binding evaluation test procedure. ISO 9462 and ISO 13992 are severely limited in their ability to evaluate important binding safety features. Therefore, it is necessary to have a performance standard to accompany the ASTM F504 test method to expose design deficiencies related to the kinematic pivot axis of boot/binding systems that ISO test methods cannot reveal.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development