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Some examples are our products EP30LV-1, EP62-1LPSP, and Supreme 112, which have extremely low viscosities and excellent wicking capabilities, for filling tiny gaps. Master Bond epoxy compounds are available in a very wide range of viscosities from as low as 100 cps to in excess of 1,500,000 cps for various bonding, coating, sealing and potting applications. Most of the epoxy resin compounds, like the great majority of other polymer systems, fall into the Non-Newtonian category.Īn epoxy’s viscosity defines the applications (such as bonding, sealing, potting etc.) that it can be used for, as well as the means by which it can be applied. In Newtonian fluids, the viscosity doesn’t depend on the shear rate, whereas in Non-Newtonian fluids, the viscosity changes based on the shear rate. Fluids are broadly classified as: Newtonian Fluids and Non-Newtonian fluids. Viscosity may be simply defined as the resistance to flow, of a liquid. High viscosity pastes are noted for their non-drip or non-sagging properties, and are used in applications where the epoxy needs to stay in its place while applying and curing. Moderate viscosity products offer convenient dispensing, and are widely used in many bonding and sealing applications. Low viscosity systems excel in many kinds of applications, including potting, encapsulation, and impregnation. Master Bond epoxy adhesives are formulated in low, medium, and high / non-drip viscosities. Viscosity is a concept which describes how a liquid material flows.Viscosity is a key criterion in the epoxy selection process, for many bonding, sealing, coating, and potting applications.
Viscosity cps manual#
Viscosity cps manual#Īdhesive 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. 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. 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. Regarding thicker adhesives,such as certain silicones or SMP-polymers, they can be difficult to measure using dynamic viscosity testing. Another type of measurement for flow can be used instead, extrusion rate. This value is usually listed in units such as g/min or ml/s. 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. Some terms commonly used are flowing/free-flowing, paste/non-flowing and thixotropic. 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. The viscosity is also dependent on outer factors including temperature. 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. 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. In reality, this means that the viscosity is lowered more when the fluid is stirred for longer. It also means that an adhesive that is thixotropic will not flow. Instead, it will maintain the shape it had when you dispensed it. When the adhesive is not exposed to shear stress, it will stop flowing. But as you stir it, or dispense it for that matter, it will start to get more thin until you stop (with a delay). Ketchup is an example of a thixotropic fluid. A thixotropic adhesive does not really tell you anything about the adhesive viscosity.