Filament Stretching Rheometer

One feature that sets the filament stretching rheometer apart from other extensional techniques is the fact that the measurement is made at a single point. This is contrary to shear rheology, which calculates the stress over the cross sectional area of the sample plates./p>

In a filament stretching rheometer, the measurement is made at the location of the smallest diameter (highest stress), often located at the midfilament position.

FAST ACTIVE CONTROL SCHEME

Soft materials deform unpredictably in extensional flow. Therefore in order to impose constant stress and/or constat rate a fast in-situ control scheme is required to make decisions on how to pull on the sample and maintain the appropriate set point. Rheo Filament has spent many years developing an efficient patent pending control scheme that allows for various different testing protocols.

The only filament stretching rheometer with active control allowing for: