A plastometer measures plastic material properties and can vary in design, size, accuracy, and cost. It can measure flow properties, hardness, and is used in material testing, classification, and quality control. Calibration is necessary for accurate and consistent measurements.
A plastometer is a device that measures the properties of plastic materials. There are a number of variations on the design which can be used to explore different properties and which provide measurements at different scales. Plastometers are carried by companies that stock materials testing and plastics research supplies, and can vary widely in size, accuracy, and cost. Some training is usually required to use the device safely and reliably.
One use for a plastometer is to provide measurements of flow properties. In this type of plastometer, sometimes known as a rheometer or extrusion plastometer, the material under test is subjected to a force and the response is measured. This device can be used with plastics in a fluid state, such as the molten resin used in casting. The plastometer can provide information about the material that will be used to grade it, determining what types of projects it can be used for and confirming that the material is of consistent quality.
The term “plastometer” is also used to describe a device capable of measuring the hardness of plastics, especially rubber. In this case, the device uses pressure to dent the material, then the penetration depth is measured. Hardness is an important property to be able to measure, as it can influence how and where various materials can be used. For example, rubber rollers on printing presses must have a carefully calibrated hardness to ensure they work properly.
In the development of new plastics, plastometers are used for classification and to establish basic information about material properties. A plastometer can also be used during material testing for new and old products. Material tests are used to confirm that a material complies with a safety standard and to establish tolerances for new materials. Similarly, plastometers can be useful in forensic examinations of plastics after an accident has occurred and in quality control to keep products consistent.
Plastometers are usually used in a controlled environment and are regularly calibrated to ensure they continue to function properly. Reliable and standardized performance is essential to ensure measurements are consistent and accurate. Many companies will handle calibration upon request, sending a technician to a lab or having instruments returned to their facilities for calibration sessions. Furthermore, the technician who maintains the device can also periodically recalibrate it, following the indications established by the manufacturer.
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