It should not be confused with inherent viscosity, which is the ratio of the natural logarithm of the relative viscosity to the mass concentration of the polymer. Learn more by visiting our website at the link below.ĭynisco’s Online Shop is where you can have access to ordering all Dynisco parts from Polymer Testing Equipment to Sensors to accessories- all to optimize your application. Intrinsic viscosity is a measure of a solute's contribution to the viscosity of a solution. With Dynisco's Online Rheometers, you can verify your polymer rheology of not only your virgin material, but virgin and recycled polymer, and eliminate quality issues before production. The entire world is working differently then we ever have in the history of manufacturing.Learn how the Dynisco IoT Cloud Connect and other support systems can help processors manage and monitor their production lines remotelyĭynisco Online Rheometers - Basic Operations Guide Dynisco is dedicated to providing plastics processors and recyclers with accurate rheological information, helping to reduce waste and encourage sustainable practicesĭynisco IoT Cloud Connect: There For You 24/7 When You Can't Be Sustainability is More than Protecting the Environment. Standards can be obtained from appropriate standard authorities.Dynisco and Sustainability in the Plastics Industry **Please note that this test description is intentionally generic in nature and aimed at providing a descriptive summary to enhance test understanding. Melt flow rate values are calculated in g/10 min.įlow rate = ( 600/t x weight of extrudate ) A timed extrudate is collected and weighed. A weight specified for the material is applied to a plunger and the molten material is forced through the die. Alternatively, comparisons between "good" parts and "bad" parts may be of value.Īpproximately 7 grams of the material is loaded into the barrel of the melt flow apparatus, which has been heated to a temperature specified for the material. Typically, flow rates for a part and the resin it is molded from are determined, and then a percentage difference is calculated. Degraded materials would generally flow more as a result of reduced molecular weight, and could exhibit reduced physical properties. It provides a means of measuring flow of a melted material which can be used to differentiate grades as with polyethylene, or determine the extent of degradation of the plastic as a result of molding.
Melt Flow Rate measures the rate of extrusion of thermoplastics through an orifice at a prescribed temperature and load. Melt Flow Index, Melt Flow Rate, ASTM D1238, ISO 1133
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