Syringe

Syringe plunger can be more or less difficult to operate to deliver or aspire liquid or gel formulation in a controlled manner.

A syringe is used to deliver or aspire liquid or gel formulation in a controlled manner using a plunger. The force (expression or aspiration) required to activate the plunger depends on various factors such as the syringe shape, dimensions, the viscosity of the formulation and the speed. A mechanical tester can be used to activate the plunger while recording the required level of force to activate it in function of the properties of the liquid or gel inside. Information on the syringe construction itself can be gained from this type of test.