ASTM D2149 Dielectric Constant & Dissipation Factor Testing for Dielectrics
ASTM D2149 is used to determine the Dielectric Constant and Dissipation Factor of solid dielectrics within frequency 50 Hz to 10 MHz and over a range of temperatures from 80 to 500 °C. The values are reported in SI units.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM D2149 provides standardized test methods for measuring the dielectric constant (relative permittivity) and dissipation factor (loss tangent) of solid and liquid dielectric materials at frequencies from 1 Hz to 100 MHz. These two electrical parameters are fundamental to the design and selection of materials used in capacitors, circuit boards, cables, and other electronic applications.
The dielectric constant indicates how effectively a material stores electrical energy in an electric field, while the dissipation factor measures the fraction of energy lost as heat. A low dissipation factor is desirable for high-frequency electronic applications where energy loss leads to heating and signal degradation. ASTM D2149 uses precision LCR bridges and impedance analyzers to measure capacitance and conductance, from which dielectric constant and dissipation factor are calculated.
Scope, Applications, and Benefits
Scope
ASTM D2149 covers the determination of permittivity (dielectric constant) and dissipation factor of solid dielectric materials over a frequency range of 50 Hz to 10 MHz and a temperature range of −80°C to 500°C.
ASTM D2149 evaluates:
- Dielectric constant (relative permittivity) of solid and liquid dielectrics
- Dissipation factor (loss tangent) across a frequency range
- Effect of frequency on dielectric properties
- Influence of temperature on dielectric behaviour
- Moisture absorption effects on electrical performance
- Material suitability for high-frequency applications
Applications
- Printed circuit board (PCB) substrate materials
- Cable and wire insulation
- Capacitor dielectric materials
- High-frequency antenna materials
- Radar and microwave absorbing materials
- Electronic packaging materials
- Transformer insulation evaluation
Benefits
- Guides material selection for electronic components
- Ensures performance at target operating frequencies
- Supports loss minimization in high-frequency designs
- Enables predictive modeling of circuit behavior
- Detects moisture ingress effects on insulation
- Provides compliance data for electrical standards
Test Process
Specimen Preparation
Flat specimens are prepared to controlled thickness with electrode contacts applied.
1Instrument Setup
Impedance analyzer or LCR bridge is calibrated at the test frequency range.
2Measurement
Capacitance and conductance are measured as a function of frequency.
3Calculation
Dielectric constant and dissipation factor are calculated from the measured values.
4Technical Specifications
| Parameter | Details |
|---|---|
| Applicable Materials | Solid ceramic dielectrics and insulating materials |
| Specimen Types | Disc, flat sheet, or precision capacitor specimens |
| Frequency Range | 50 Hz to 10 MHz |
| Temperature Range | −80°C to 500°C |
| Test Environment | Controlled frequency and temperature conditions |
Instrumentation Used for Testing
- LCR bridge or impedance/network analyzer
- Three-terminal electrode fixture
- Micrometer for specimen thickness measurement
- Temperature-controlled test chamber
- Calibration standards
- Data acquisition software
Results and Deliverables
- Dielectric constant vs. frequency curves
- Dissipation factor vs. frequency data
- Temperature-dependent dielectric property tables
- Quality assurance reports
- Material selection guidance data
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Frequently Asked Questions
It measures the dielectric constant (relative permittivity) and dissipation factor (dielectric loss) of solid dielectric materials.
This method is primarily used for solid ceramic dielectrics and other insulating solid materials.
The test covers frequencies from 50 Hz to 10 MHz.
The standard supports testing from −80°C up to 500°C.
It helps in quality control, material selection, and electrical insulation performance evaluation, especially for high-temperature dielectric applications.
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