Elastomer-Testing
12Pages

ELASTOMER TESTING Dynamic-mechanical and rheological characterization of natural and synthetic rubber compounds

Basics Elastomer Testing - for more than 45 years! Viscosity, Rheo-Kinetics, Capillary Rheometry, Vulcametry Elastomer testing for determination of the processing behaviour of reactive materials In order to fulfil the continuous increasing requirements in regard to quality and consistency of rubber products, it is essential to make a comprehensive characterisation of the raw compound while processing. Elastomeric compounds are complex multiple mixture out of main components like polymers, fillers, plasticizers, additives and vulcanizing chemicals. The interactions of various materials cause...

Elastomer Testing MOONEY-VISKOSIMETER - Standardized procedure for reliable test results A shearing disk viskosimeter with closed chamber and rotor, which is used to determine the Mooney Viscosity and the scorch characteristics recorded over time of unvulcanised rubber compounds and samples of pure natural rubber or synthetic rubber. MOONEY-VISKOSIMETER The test sample consists of two round blanks (formed using a punch), one of it has a bore hole in the centre for passing through the rotor. The punched test samples are formed homogenous. The sample is being sheared in the closed test...

Elastomer Testing The ELASTOGRAPH The rotorless shear stress Vulcameter system for determining the cross linking kinetics This unit is optimized for fast release tests as well as for the research and development of elastomers. The ELASTOGRAPH serves for definition of elastic material properties in plastic state while pre-vulcanization and at the vulcanized material sample. The sample is affected to torsion via the sinus-shaped rotation swing in the lower test die half. The torque and the phase angle are recorded as a function of the measuring time. The Software „RubberView“ controls the...

Elastomer Testing Dynamic Rheometer for Analysis of Viscoelastic Material Properties The VISCO-ELASTOGRAPH is a dynamic/mechanical operating rheometer for characterization of viscoelastic material properties of raw polymers, basic and ready compounds. This sensitive testing method is well suited to define polymer properties with highest sensitivity and reproducibility. Furthermore for the development to typify raw polymers and compounds based on their average molecular weight distribution. Significance: • Comprehensive viscoelastic characterization of natural or synthetic rubber as well as...

Elastomer Testing Rubber Capillary Rheometer RCR - production accompanying rheological process inspection For the laboratory simulation of production processes with elastomers the new RUBBER CAPILLARY RHEOMETER (RCR) comes with 2 test modes. The capillaries are exchangable, on the one hand the flow behaviour in the mode „Extrusion“ can be handled, on the other side also in mode „injection molding“ with different and easy to install mold forms (ramification and spiral tool). The Highlights: • Tests under production and processing conditions • Test piston force max. 75 kN • Test piston...

Elastomer Testing High Pressure Capillary Rheometer „RHEOGRAPH 120“ - not only suitable for high polymers... ... but also for elastomers! The complete multifunctional RHEOGRAPH family is suitable among others to determine the flow and viscosity function on rubber compounds and can be used as a tool to optimize the development on new blends. The system allows extensive and process near simulations for material characterization and delivers information for expressive evaluations, like Mooney correction (wall slip behaviour) or flow instabilities (Shark Skin Effect). The technical highlights...

Software Software „RubberView“ - only a short view into the possibilities... RubberView is the database Software for the ELASTOGRAPH, VISCO-ELASTOGRAPH, for MOONEY-VISKOSIMETER and the RHEOVULKAMETER (RCR). The easy and user friendly handling, the wide range of application possibilities and the work with databases were the basic ideas when developing the program in a completely new way. The program is used for parameterization, for control of the measuring procedure as well as for evaluation under a simple to use and clearly represented desktop. Special applications are allowed to implement...

Evaluation Methods Extractions of the capability... Variable Time Comparable with the usualVulkameter test here the module and the viscosity via the time are being captured at constant amplitude and frequency. > ELASTOGRAPH and VISCO-ELASTOGRAPH Via an integrated temperature program definable temperature steps can be individually realized. The example here shows a non-isothermal vulcanization. The swinging deformation of the lower chamber half can be controlled exactly between 0.1 to 50 Hz. Torque, module and viscosity are being measured at preselected amplitude. Classic test to determine...

Elastomer Testing Not only pure statistics... Amplitude Sweep non vulcanized 10000 With this measurement variable ramified polymers can be differentiated to various active filling additives (here at an example of a fluor elastomer compound). Is being used to judge the network which is arised during the vulcanization. > VISCO-ELASTOGRAPH An amplitude sweep at an non vulcanized compound shows the Payne effect. The crossing point of G‘ and G‘‘ helps judging the filler medium network. VISCO-ELASTOGRAPH G´ VISCO-ELASTOGRAPH G´´ VISCO-ELASTOGRAPH G´´ 10 1 Frequency dependance of the phase angle 6...

Material Characterization There is more to it than that... Memory and loss modulus The diagram shows the memory and the loss modulus of 2 NBR compounds with different raw polmers. This evaluation serves a comparison between the elastic and the viscous material behaviour G´ProbeB G" Probe B G´Probe B G" Probe B G´Probe A G" Probe A 10 0,001 The measurement of the relaxing time is being determined out of a disturbance test. It characterize the visco elastic material behaviour and is important for process near properties. The Mooney-Scorch mode characterize the scorching (vulcanizing)...