ASTM D2149

ASTM D2149 is the ASTM standard for measuring permittivity, also called dielectric constant, and dissipation factor of solid dielectrics at frequencies up to 10 MHz and temperatures up to 500 °C. It is used to characterize how insulating materials respond to electric fields under controlled conditions, which can support material selection, development, and quality control. By defining a consistent test method, the standard helps users compare dielectric performance with greater confidence.

Purpose of ASTM D2149

The purpose of ASTM D2149 is to provide a standardized test method for evaluating key electrical properties of solid dielectric materials across a defined frequency and temperature range. It focuses on permittivity and dissipation factor, two measurements commonly used to describe insulating behavior and energy loss. As a technical document, it supports repeatable testing conditions so results can be compared more reliably between laboratories, product lots, or material candidates.

Common use cases of ASTM D2149

This standard is commonly used when testing solid insulating materials for electrical performance at elevated temperatures or across higher-frequency conditions. It may be applied in material qualification, product evaluation, research and development, and incoming or production quality checks. ASTM D2149 is especially relevant when a project needs consistent dielectric data to support design decisions, compare candidate materials, or confirm that a material remains suitable under thermal and electrical stress.

Why ASTM D2149 matters

ASTM D2149 matters because dielectric properties can change with both frequency and temperature, affecting how an insulating material performs in service. Using a recognized ASTM standard improves consistency in testing and helps reduce uncertainty in procurement and compliance decisions. It also supports clearer communication between buyers, suppliers, and laboratories by giving all parties a common method for reporting permittivity and dissipation factor results.

• Permittivity and dielectric constant measurement
• Dissipation factor evaluation
• Solid dielectric materials testing
• Up to 10 MHz frequency range
• High-temperature electrical property assessment