![viscosity cps viscosity cps](http://www.evahotmeltglue.com/photo/pl22043958-25kg_bag_eva_hot_melt_glue_for_carton_box_sealing_adhesive_at_2000_cps_viscosity.jpg)
A thixotropic adhesive does not really tell you anything about the adhesive viscosity. Ketchup is an example of a thixotropic fluid. But as you stir it, or dispense it for that matter, it will start to get more thin until you stop (with a delay). When the adhesive is not exposed to shear stress, it will stop flowing. Instead, it will maintain the shape it had when you dispensed it.
![viscosity cps viscosity cps](https://img.yumpu.com/10592805/1/500x640/calibration-fluids-thermo-fisher.jpg)
It also means that an adhesive that is thixotropic will not flow.
![viscosity cps viscosity cps](https://ae01.alicdn.com/kf/HTB1zI0.dlKw3KVjSZTEq6AuRpXaA.jpg)
In reality, this means that the viscosity is lowered more when the fluid is stirred for longer. What does it mean if an adhesive is thixotropic?Ī fluid is thixotropic when its viscosity is affected by movement (shear stress) and also is dependent of the time during which this movement takes place. How will I dispense the adhesive? Is any type of equipment already determined?.Do I need to build up a certain thickness of the adhesive bond? (Tip: look in the technical data sheet where the recommended maximum gap fill is usually stated).Does the adhesive need to flow out to a bigger surface area than the string of glue I dispense? Or du I want it to stay put?.Some examples of questions to ask yourself: When choosing an adhesive, it is important to consider that the adhesive itself as well as its viscosity is suitable for both the final product and the gluing process. The viscosity is also dependent on outer factors including temperature. Please note that it can be quite difficult to compare viscosities of different adhesives due to the fact that any values will depend on the method or standard used when measuring, such as the rpm. Some terms commonly used are flowing/free-flowing, paste/non-flowing and thixotropic. What is measured is the amount of material extruded from a certain apparatus during a specific time and pressure.Īpart from viscosity values, you will often also find a mention of the consistency of of the adhesive in its specification. This value is usually listed in units such as g/min or ml/s. Another type of measurement for flow can be used instead, extrusion rate. Regarding thicker adhesives,such as certain silicones or SMP-polymers, they can be difficult to measure using dynamic viscosity testing. The unit can be centiPoise (cP or cPs) or mPa Values of so called dynamic viscosity (which is the type normally used within the adhesives industry) is usually stated in the technical data sheet (TDS) of the adhesive. If something has a low viscosity, it flows easily, and if something has a high viscosity, it flows with more difficulty – it is a viscous fluid.
Viscosity cps manual#
Adhesive viscosity is an important factor to consider when setting up your bonding process, regardless of whether it’s manual in a small scale or an automatic high-speed production. Viscosity is a concept which describes how a liquid material flows.