Hub Bond Strength of Hypodermic Needles
For the safety of both the patient and the handler, it is imperative to understand the strength of the bond between the needle and the needle hub of the syringe. The bond strength must be able to withstand typical tensile and compressive forces seen in daily use. This bond is commonly tested to several standards, including ISO 11070 Annex I, ISO 7864 Annex E, and ISO 11040-1 Annex G.1. The needle is generally machined out of stainless steel, and the hub is typically made of either glass or plastic.
The challenges of this type of testing are:
- Secure gripping of specimens
- Accurately recording the point of failure
- Secure gripping of the specimen – The advanced screw side-action grips are ideal for this testing because of the manual adjustability of the jaw faces. In addition, Instron offers rubber coated vee serrated jaw faces, which apply ample force to hold the syringe barrel under test without crushing or inducing premature failure.
- Accurately recording the point of failure - Bluehill® Universal allows the user to adjust the data sampling rate of the software, up to 1 kHz, in order to capture the most data points and to capture the force deflection curve accurately.
It is important to review the appropriate standard to fully understand the test setup, procedure, and results requirements.
5900 Universal Testing Systems are engineered for precision, built for durability, and offer the flexibility for changing requirements. They are designed with standard and optional features that increase testing efficiency and improve the testing experience for the operator. A wide range of models are available for testing capacities from < 100N up to 600kN.
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Catálogo do Bluehill Universal em PT-BR
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Screw side-action grips provide a very simple and efficient method for holding test specimens in a wide range of applications. The dual - acting design of 2710-100 series grips means that jaw faces can be adjusted to accommodate different specimen thicknesses. This ensures that the line of tensile force remains concentric with the grip body. They can be equipped with a selection of interchangeable grip jaw faces in various sizes and choice of surfaces including smooth ground, rubber-coated and serrated. Line contact and special coated faces are also available.The unique ‘snap-on’ jaw face attachment makes changing faces extremely quick and simple.
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