Dynamic characteristics of bandages

A bandage is defined by measurement of its dynamic characteristics in the laboratory:
  • Elasticity . The elasticity of a bandage is the capacity of the stretched textile to return to its initial shape once the deformation force has been removed (in other words, its capacity to resist the stretching force).
    In practice, it is not this measurement that has been adopted internationally to determine whether a bandage falls into the category of “elastic”, “non-elastic or low-elastic” bandages, measurement of extensibility being used instead.


 

  • Loss of linear recovery assessed on the basis of a hysteresis graph . To assess the deformation and wear of the textile used for the bandage, it is subjected to stretch and release cycles during which the % extensibility is measured as a function of the force applied.

    This leads to hysteresis graphs being plotted, showing the loss of linear recovery of the textile following stretch and release cycles. Ie the ability of the bandage to return to its original shape.

 

 

 

This leads to the definition of long-stretch bandages and short-stretch bandages.

The standards are far from international and once again can vary depending on the country. However, an international classification system has emerged in recent years:

  • long-stretch, elastic bandages have an extensibility > 100-120% *
  • short-stretch bandages have an extensibility <100-120% *

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* the limit between the two types of bandages ranges from 100% to 120% depending on the publication and the country.

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