A rheometer is a core piece of equipment for research and quality control in the coatings, adhesives, inks, and polymer materials industries. On the market, rheometers mainly fall into two categories: rotational rheometers and capillary rheometers. They work on different principles and are suited to different scenarios. Choosing the wrong one not only wastes your budget but can also lead to missing critical data.  

Rotational rheometers are the most versatile rheology tool. They can provide rich rheological parameters such as viscosity curves, storage modulus G', loss modulus G", yield stress, thixotropy, and more. Key selection indicators include torque range (nN·m level for dilute solutions, mN·m to 200 mN·m covering most R&D applications), temperature control system (Peltier, -40°C to 200°C), measurement fixture types (cone-plate for high shear, parallel plate for variable gap tests, coaxial cylinder for low viscosity samples), and normal force sensors (a must for polymer melts). For R&D of UV-curable coatings/adhesives, a UV curing accessory is also a key configuration. In terms of brands, the TA Instruments Discovery HR series is the industry gold standard, while the HAAKE MARS series offers great value for money.  

Capillary rheometers are closer to actual processing conditions. They push the sample through a die using a piston, measuring viscosity behavior at high shear rates (usually 10²~10⁶ s⁻¹), making them perfect for simulating processes like injection molding and extrusion. For companies modifying engineering plastics or producing color masterbatches, a capillary rheometer is an indispensable tool for process optimization.  

Dehuisci (www.dehuisci.com) distributes the full series of TA Instruments rotational and capillary rheometers and can provide free sample testing and selection consultation. Phone: 0512-67071902.