Open time

Open time refers to the amount of time an adhesive can be applied and worked on before it cures. This time is an important factor in adhesive technology as it affects how much time is available to position and align the adhesive before it sets.

The open time depends on various factors such as the type of adhesive, the ambient temperature and humidity. Some adhesives have a very short open time while others have a longer open time. For example, epoxy adhesives can have a longer open time than other adhesives such as cyanoacrylate, which cure quickly and allow little time for positioning.

Open time is particularly important for larger or complex adhesive joints where more time is needed to apply and work the adhesive. It is also often considered in combination with cure time, which is how long it takes for the adhesive to fully cure and reach full strength.

In some applications, the open time of the adhesive is also influenced by the use of auxiliaries such as activators, retarders or accelerators. Activators and accelerators can accelerate cure while retarders can increase open time.

Overall, the open time is an important factor when choosing the right adhesive and planning adhesive connections. Knowing the open time can help achieve a more successful and efficient bond that meets the needs of the application.