ASTM D1823 is the ASTM standard for measuring the apparent viscosity of plastisols and organosols at high shear rates by extrusion viscometer. It provides a practical test approach for evaluating flow behavior under demanding processing conditions, where viscosity can strongly affect handling, application, and product consistency. For manufacturers, laboratories, and quality teams, this technical document helps support more reliable comparison of materials and more consistent performance assessment.

Overview of ASTM D1823

The Standard Test Method for Apparent Viscosity of Plastisols and Organosols at High Shear Rates by Extrusion Viscometer defines a controlled way to measure how these materials respond when forced through an extrusion viscometer. That makes ASTM D1823 useful for assessing flow properties under high shear, rather than relying only on low-shear or static measurements. In practice, this helps users understand whether a plastisol or organosol is suitable for processing, application, or specification review.

Common use cases of ASTM D1823

This standard is commonly used when plastisols or organosols need viscosity testing that reflects high-shear processing behavior. It is relevant in product development, incoming material checks, and routine quality control where extrusion-based measurement is part of the workflow. ASTM D1823 may also support supplier qualification and technical comparisons when consistent flow performance is important. Because it focuses on apparent viscosity at high shear rates, it is especially useful for materials intended to be pumped, extruded, or otherwise processed under force.

Benefits of using ASTM D1823

Using ASTM D1823 helps create a shared basis for testing and comparison across batches, suppliers, and internal laboratories. The standard supports more consistent quality control by giving a defined method for measuring apparent viscosity under high-shear conditions. That can reduce ambiguity in material evaluation, improve procurement decisions, and help identify processing issues earlier. For organizations working with plastisols and organosols, ASTM D1823 is a practical tool for technical consistency and compliance-oriented testing.

• High-shear viscosity measurement
• Extrusion viscometer testing
• Plastisols and organosols evaluation
• Quality control and material comparison
• Consistent technical testing workflow