How to compare high flexibility claims

Technical explanation

The minimum bend radius describes the permitted geometry; on its own it does not say how much force is needed to bring the hose into that geometry. There may be separate values for static and dynamic use. Pressure and temperature can also affect actual installation behavior. Ranking flexibility claims given in catalogs according to different test methods directly can lead to wrong conclusions. The rigid parts at the ends and the straight zones that must be maintained are part of the total space requirement.

Source: S024, S031

Topic-specific checkpoints

Source: S024, S031

How is it assessed in practice?

In the recommended trial, create a representative route on a drawing or a suitable fixture; do not decide just by bending a short piece by hand. Review all movement positions of the machine, abrasion points and the force on the connection. For example, if the connection orientation of a lighter hose is not suitable, the operator may install it by twisting it; in this case the weight advantage does not ensure correct installation. Link the trial result to the product code and size.

Original editorial recommendation; not a clause of a standard.

Frequently asked questions

Is a product with a smaller radius always softer?

No. The geometric limit and the bending force are different properties. Assess separately that both meet the needs of the application.

Source: S024, S031