IEC 62899-204:2019

Overview

IEC 62899-204:2019 - Printed electronics, Part 204 - specifies standard measurement methods for insulator inks and printed insulating layers used in printed electronics. The standard defines terminology, conditioning and atmospheric test conditions, and standardized procedures for characterizing physical, electrical and optical properties of insulator/dielectric inks and the layers they form after printing.

Key topics and technical requirements

IEC 62899-204 organizes measurement methods and test requirements around practical material properties. Major topics include:

• Scope and definitions
  • Applies to insulator inks (including dielectric inks) and printed insulating layers used in printed electronics.
• Atmospheric conditioning
  • Specifies conditioning and evaluation atmospheres consistent with ISO standards for reliable, repeatable testing.
• Measurement of insulator ink physical properties
  • Density (pycnometer/immersion methods referenced)
  • Rheology / viscosity (rotational viscometer and defined shear-rate tests)
  • Surface tension (pendant/droplet or film methods)
  • Flash point (open/closed cup methods)
• Measurement of insulating layer properties
  • Electrical properties
    • Volume resistivity
    • Dielectric constant (relative permittivity)
    • Electric strength (breakdown voltage)
  • Optical properties
    • Luminous transmittance
    • Chromaticity (CIE Lab)*
    • Colour uniformity and haze
    • Refractive index
  • Test-piece preparation, substrate considerations, electrode geometries and dimensional requirements for reliable results.
• Storage and shelf-life evaluation
  • Recommended storage conditions, methods to measure deterioration due to storage, and reporting requirements.
• Normative references
  • Cross-references established IEC and ISO test methods (for example, IEC 60243, IEC 62631-2-1 and multiple ISO standards).

Practical applications

IEC 62899-204 is intended to provide repeatable, harmonized test methods so manufacturers and labs can:

• Characterize and certify insulator/dielectric inks for use in printed circuits, flexible electronics, sensors, OLED encapsulation, wearable devices and barrier coatings.
• Compare formulations from different suppliers using consistent metrics (e.g., dielectric constant, resistivity, breakdown strength).
• Support R&D, quality control, and material selection for roll-to-roll (R2R), inkjet and screen printing processes.

Who should use this standard

• Ink and material formulators and suppliers
• Test laboratories and quality assurance teams
• Printed electronics OEMs and designers (flexible circuits, displays, sensors)
• Researchers and standards bodies working on printed electronic materials and components

Related standards

IEC 62899-204 references and complements other standards in the IEC 62899 series (materials and equipment for printed electronics) and established IEC/ISO test methods (e.g., IEC 60243, IEC 62631-2-1, ISO 291, ISO 19403). Use IEC 62899-204 alongside those documents for full compliance and comparable test data.