![]() To avoid rubber slippage during the determination, both the chamber walls and the rotor surface are striated. Inside the test chamber a disc is rotated by means of a motor. The rubber compound is introduced under pressure into the test chamber, made up of two halves. A number proportional with the value of this torque is taken as viscosity index (Mooney viscosity) and is reported in arbitrary Mooney units. The working principle of the Mooney viscometer consists in the measurement of the torque necessary to rotate a disc in a cylindrical chamber filled with the rubber compound to be vulcanized. Invented by Melvin Mooney, it contains a rotating spindle and heated dies, the substance encloses and overflows the spindle and the mooney viscosity is calculated from the torque on the spindle. Comparison of results of manual mixing and ARV-310įinally, two-component silicone resins stirred manually and by ARV-310 are cured to form stirred samples.Īre you having such troubles as “Bubbles cannot be removed completely” or “The material becomes too hot?” At the Applications Laboratory or our demonstration room, you can perform demonstrations (tests) and evaluations using our products for mixing, defoaming, pulverizing, and dispersing together with our professional technical team.A Mooney viscometer MV 2000 Mooney ViscometerĪ Mooney viscometer is an instrument used for measuring the Mooney viscosity of rubbers. * Due to circumstances surrounding the video recording process, some scenes may appear unclear. How the bubbles are removed with time can be observed directly. No spillage of silicone occurs due to the centrifugal force of the revolution. When rotation starts, bubbles rise continuously to the surface due to vacuum decompression. Install a container containing silicone of 1,000,000 mPa The appropriate machine is the vacuum-type Thinky Mixer ARV-310. Removing bubbles completely from viscous materials is an extremely time-consuming task.ģ-2. The result shows that it takes two days for the bubbles to disappear, that is, the bubbles are not visible to the naked eye. s viscosity into a beaker, and let it stand until all the bubbles disappear. ![]() Transfer manually stirred silicone of 1,000,000 mPa How long does it take to remove bubbles when left to stand? Furthermore, air is trapped in the material when stirred, forming bubbles.ģ-1. s, considerable force is required for manual stirring.s viscosity into a container, and stir manually.įor silicone with a viscosity of 1,000,000 mPa.It takes almost two minutes for silicone with 1,000,000 mPa Flow of siliconeĪ fixed amount of silicone is transferred into a container, the container arm is tilted, and how silicone flows is observed. The viscosities of the prepared silicones are 1.5 mPa In this experiment, silicones having different viscosities are prepared, and the viscous characteristics of the materials are compared by inducing flow or manual mixing. Please note that the viscosity may change depending on the temperature, the amount, the constituents, etc. ![]() * The graph shows approximate values under certain conditions. The viscosities of materials that are generally encountered in our daily lives are shown in the following graph: In addition, cP (centipoise) is the conventional measurement unit. As viscosity value increases, the force due to viscosity increases as well. In general, it is considered a property of a fluid, such as a liquid, but it may be used also for solids. As familiar examples, viscosity is used to describe the “thickness” of water, honey, and other food ingredients the “creaminess” of hand cream the “smoothness” of ink etc. Its expression varies depending on the material and the application. Viscosity refers to the “stickiness” of a fluid. ![]()
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