NBN ISO 4666-3:2021

This document specifies the flexometer test with constant-strain amplitude for the determination of
the temperature rise and resistance to fatigue of vulcanized rubber. The flexometer specified is known
as the Goodrich flexometer, but any other apparatus giving equivalent performance can be used.
This document gives directions for carrying out measurements which make possible predictions
regarding the durability of rubbers in finished articles subject to dynamic flexing in service, such as
tyres, bearings, supports, V-belts, and cable-pulley insert rings. However, owing to the wide variations
in service conditions, no simple correlation between the accelerated tests described in the various
parts of this document and service performance can be assumed.
The method is not recommended for rubber having a hardness greater than 85 IRHD.