ASTM D5187

ASTM D5187 is the standard test method for determining the crystallite size (Lc) of calcined petroleum coke by X-ray diffraction. It provides a controlled approach for measuring a key structural property that can support material characterization, quality checks, and product comparison. For organizations working with calcined petroleum coke, this ASTM standard helps bring consistency to test results and offers a technical basis for evaluating crystallite size using an established diffraction method.

What is ASTM D5187?

ASTM D5187 is a test method focused on calculating the crystallite size, often expressed as Lc, in calcined petroleum coke. Based on X-ray diffraction, the standard is intended to support measurement of this structural feature in a repeatable way. The method is useful when a clear, standardized procedure is needed for laboratory testing, data comparison, and specification-related work. As an ASTM standard, it helps align testing practices around a common technical reference.

Where is ASTM D5187 used?

This standard is commonly used in laboratories and quality control environments that evaluate calcined petroleum coke. It may be applied during incoming material checks, process monitoring, or product verification where crystallite size is an important characteristic. Because the method uses X-ray diffraction, it is relevant to testing workflows that depend on analytical instruments and consistent sample measurement. ASTM D5187 is especially useful when reported results must be comparable across different labs or purchasing programs.

Why is ASTM D5187 important?

ASTM D5187 matters because it supports a consistent way to measure a defined structural property of calcined petroleum coke. Standardized testing can improve confidence in results, help reduce variation between laboratories, and support more reliable procurement and compliance decisions. It also gives buyers, suppliers, and quality teams a shared technical basis for evaluating product characteristics. In practice, that can help reduce uncertainty when comparing lots, confirming specifications, or documenting performance-related properties.

• X-ray diffraction-based test method
• Crystallite size (Lc) measurement
• Applicable to calcined petroleum coke
• Supports laboratory consistency
• Useful for quality and specification review