Rosand RH7/ RH10 Capillary Rheometers

Research-level Rosand RH7 and RH10 capillary rheometers provide highly flexible measurement capabilities for materials under high pressure and high shear rate extrusion – from polymer melts to ceramics, and from foodstuffs to inks and coatings.

• High force range (up to 100kN) and wide dynamic speed range (>225,000:1) allow test correlation with real material processing conditions.
• Twin bore barrels as standard enables absolute shear viscosity measurements and simultaneous calculation of extensional (elongational) viscosity.
• Range of optional barrel sizes and barrel materials to permit measurement of thermally-sensitive, chemically-aggressive or aqueous-based samples.
• Wide range of high precision tungsten carbide dies as standard to cover all materials and test types.
• Easily interchangeable melt pressure transducers to cover all test requirements – configured with low noise, triple-stage amplifiers for optimized measurement sensitivity at the die entry when using ‘zero length’ dies (extensional viscosity measurements).
• Nitrogen purge option available for testing in a dry, inert atmosphere to minimize sample degradation.
• Integral fume chamber with extraction to vent sample gases for operator safety.
• Proprietary bi-modal speed control algorithms suited to low and high-speed operation optimize shear rate measurement range for a particular die.
• Precise sample temperature control using three independent zone heaters, with 10 times DIN accuracy platinum resistance thermometers. High temperature (500ºC maximum) and cooling coil options are also available.
• Rigid ‘H’ frame design for compliance-free measurements in transient tests such as pVT determination.
• Open design below barrel exit to accommodate optional accessories such as die swell measurements, melt cutters, slot die system and melt strength (Haul Off).
• Easy to use Flowmaster software with full range of tests and analyses for shear and extensional viscosity, as well as determining sample stability, wall slip and melt fracture.

• Characterization of polymer or suspension rheology across a range of shear rates and temperatures
• Simulation of extensional viscosity dominated processes such as fibre spinning, blow moulding, film blowing and thermoforming
• Assessment of extrusion behaviour for processes such as injection moulding and hot melt extrusion
• Evaluation of material behaviour at process relevant shear rates such as high speed coating and printing applications
• Detection of polymer instabilities such as melt fracture and thermal degradation
• Measurement of material elasticity and related properties such as die swell

Industry applications:

• Polymers
• Coatings
• Ceramics
• Metals
• Pharmaceuticals
• Sealants
• Foods
• Inks