IEC 60068-2-78:2025 PDF

Environmental testing - Part 2-78: Tests - Test Cab: Damp heat, steady state

First page of standard IEC 60068-2-78:2025

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Title (English):

IEC 60068-2-78:2025

Environmental testing - Part 2-78: Tests - Test Cab: Damp heat, steady state

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 13
Publication date:: August 6, 2025
Edition:: IEC IS 60068 edition 3 version 1
ICS:: 19.040

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Description (English):

IEC 60068-2-78:2025 establishes a test method for determining the ability of components or equipment to withstand transportation, storage and use under conditions of high humidity. The object of this document is to investigate the effect of high humidity at constant temperature without condensation on a specimen over a specified period. It is applicable to small equipment or components as well as large equipment and can be applied to both heat-dissipating and non-heat-dissipating specimens. This third edition cancels and replaces the second edition published in 2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) revision of the requirements for the test chamber; b) revision of the severities and including the dew point temperatures; c) change of the temperature tolerances of the test to limits; d) inclusion of a specified preconditioning procedure; e) inclusion of a new figure for clarification purposes; f) revision of standardized requirements for the test report.

Technical details

Technical committee: TC 104 - Environmental conditions, classification and methods of test
SKU: IEC 60068-2-78:2025

Abstract

Overview

IEC 60068-2-78:2025 - "Environmental testing - Part 2-78: Tests - Test Cab: Damp heat, steady state" defines a laboratory test method to assess the ability of components and equipment to withstand high humidity at constant temperature without condensation. Applicable to both small and large items, and to heat‑dissipating and non‑heat‑dissipating specimens, this third edition (2025) replaces the 2012 edition and introduces significant technical updates to chamber requirements, severities (including dew point specification), tolerances, preconditioning, and test reporting.

Key topics and technical requirements

Test objective: Evaluate effects of moisture absorption and vapor diffusion during exposure to sustained high humidity at constant temperature (no condensation).
Test severities: Preferred temperature/RH combinations (examples):
- 30 °C ± 2 K / 93 % RH ± 3 %
- 30 °C ± 2 K / 85 % RH ± 3 %
- 40 °C ± 2 K / 93 % RH ± 3 %
- 40 °C ± 2 K / 85 % RH ± 3 %
Methods I–IV: Defined ranges with corresponding dew point temperatures (provided in the standard) to better characterise humidity severity.
Test durations: Preferred durations include 12 h, 16 h, 24 h, 2 days, 4 days, 10 days, 21 days, 56 days.
Test chamber requirements: Updated to align with IEC 60068-3-6 - chamber volume, sensor placement, draining/purification of condensate, non‑radiant specimen exposure, injection of moisture remote from specimen, and water conductivity limits.
Preconditioning: A specified preconditioning procedure is now included to standardize specimen state before conditioning periods.
Measurement and reporting: Revised standardized requirements for the test report and clearer measurement definitions (initial, intermediate, final).
Temperature tolerance: The document changes temperature tolerances to defined limits (e.g., total temperature tolerance ±2 K), reflecting tighter control expectations.

Applications and users

IEC 60068-2-78:2025 is used for:

Environmental testing laboratories and climatic test chambers
Manufacturers of electronics, electrical equipment, automotive, aerospace, and industrial products
Design, reliability and qualification engineers assessing humidity resistance, corrosion risk, insulation degradation, and component lifetime
Quality, compliance and regulatory teams preparing test evidence for product approval and reliability claims

Practical benefits include consistent humidity test setups, repeatable severity definitions (including dew point), and standardized reporting for procurement and certification.

Related standards

IEC 60068-1:2013 - General and guidance
IEC 60068-2-67 - Damp heat, steady state (accelerated/component test)
IEC 60068-3-6 / 3-7 - Chamber performance and operation guidance
IEC Guide 104 - Safety publications guidance

Keywords: IEC 60068-2-78:2025, damp heat steady state, environmental testing, high humidity test, test chamber, dew point, preconditioning, reliability testing.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Test objective: Evaluate effects of moisture absorption and vapor diffusion during exposure to sustained high humidity at constant temperature (no condensation).
Test severities: Preferred temperature/RH combinations (examples):
- 30 °C ± 2 K / 93 % RH ± 3 %
- 30 °C ± 2 K / 85 % RH ± 3 %
- 40 °C ± 2 K / 93 % RH ± 3 %
- 40 °C ± 2 K / 85 % RH ± 3 %
Methods I–IV: Defined ranges with corresponding dew point temperatures (provided in the standard) to better characterise humidity severity.
Test durations: Preferred durations include 12 h, 16 h, 24 h, 2 days, 4 days, 10 days, 21 days, 56 days.
Test chamber requirements: Updated to align with IEC 60068-3-6 - chamber volume, sensor placement, draining/purification of condensate, non‑radiant specimen exposure, injection of moisture remote from specimen, and water conductivity limits.
Preconditioning: A specified preconditioning procedure is now included to standardize specimen state before conditioning periods.
Measurement and reporting: Revised standardized requirements for the test report and clearer measurement definitions (initial, intermediate, final).
Temperature tolerance: The document changes temperature tolerances to defined limits (e.g., total temperature tolerance ±2 K), reflecting tighter control expectations.

Applications and users

IEC 60068-2-78:2025 is used for:

Environmental testing laboratories and climatic test chambers
Manufacturers of electronics, electrical equipment, automotive, aerospace, and industrial products
Design, reliability and qualification engineers assessing humidity resistance, corrosion risk, insulation degradation, and component lifetime
Quality, compliance and regulatory teams preparing test evidence for product approval and reliability claims

Practical benefits include consistent humidity test setups, repeatable severity definitions (including dew point), and standardized reporting for procurement and certification.

Related standards

IEC 60068-1:2013 - General and guidance
IEC 60068-2-67 - Damp heat, steady state (accelerated/component test)
IEC 60068-3-6 / 3-7 - Chamber performance and operation guidance
IEC Guide 104 - Safety publications guidance

Keywords: IEC 60068-2-78:2025, damp heat steady state, environmental testing, high humidity test, test chamber, dew point, preconditioning, reliability testing.

IEC 60068-2-78:2025 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and users

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and users

Related standards

Related standards

Environmental testing - Part 1: General and guidance

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