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GB/T 2423.16-2022

Environmental testing—Part 2: Test methods—Test J and guidance: Mould growth (English Version)

GB/T 2423.16-2022
Standard No.
GB/T 2423.16-2022
Language
Chinese, Available in English version
Release Date
2022
Published By
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest
GB/T 2423.16-2022
Replace
GB/T 2423.16-2008
Scope
This document describes test methods for determining the extent of mold growth on electrical and electronic products and the effect of mold growth on product performance and other relevant characteristics. Since mold growth conditions include high relative humidity, this document is applicable to electrical and electronic products that are stored, transported and used for a period of time in a humid environment.
Introduction

Interpretation of the core content of the standard

This standard replaces GB/T2423.16-2008 and is equivalent to the IEC60068-2-10:2018 international standard, which specifies the test method for mildew growth of electrical and electronic products in hot and humid environments. The main technical changes include:

  • Added a new Terms and Definitions chapter
  • Revised the test instructions
  • Corrected the expression of chemical reagent concentration units

Test Method Comparison

Dimension Test Method 1 Test Method 2
Culture Medium Type Inorganic Salt Solution (Without Carbon Source) Nutrient Solution (With Carbon Source)
Applicable Scenarios Material Antifungal Test Surface Contamination Simulation
Severity level 28d/56d Fixed at 28d
Judgment standard 0-3 level (mold growth area) 0 level is the highest requirement

Key technical requirements

Test strain management

The standard stipulates the use of 8 typical molds for mixed inoculation, including Aspergillus niger, Aspergillus terreus, etc. (see Table 1). The strains must be obtained from recognized collection centers, and the spore concentration must be controlled between 1×10?/mL and 2×10?/mL.

Equipment and environmental control

  • Temperature: 28℃~30℃ (fluctuation ≤1K/h)
  • Humidity: >90%RH (no condensation water dripping)
  • Inoculation equipment: It is recommended to use ultrasonic atomizer in combination with a safe inoculation box

Implementation suggestions

Enterprise response strategy

  1. Material selection stage: Prioritize anti-mildew materials certified by ISO846
  2. Design stage: Avoid the formation of water vapor retention structures, and adopt sealed design for key components
  3. Test preparation:
    • Large equipment can be disassembled for testing
    • Establish biosafety operation specifications (refer to Appendix C)
  4. Application of results: Improved protective measures are required for mold growth level 2b and above

Laboratory construction requirements

It is recommended to pass GB/T27025-2019 certification and be equipped with:

  • Class II biosafety cabinet
  • Spore counting equipment (microscope/turbidimeter)
  • Specialized sterilization equipment (high-pressure steam sterilizer)

Standard evolution analysis

This version of the standard strengthens the biosafety management requirements, with the following major technical evolutions:

  • Safety specifications: Added 4 new safety appendices (AD) to clarify spore handling protective measures
  • Test accuracy: Ultrasonic atomization inoculation is mandatory to improve the reproducibility of results
  • International coordination: Maintain test method consistency with ISO846:2019

This standard and MIL-STD-810F method 508.5 together constitute the mold protection evaluation system for military and civilian products.

GB/T 2423.16-2022 history

  • 2022 GB/T 2423.16-2022 Environmental testing—Part 2: Test methods—Test J and guidance: Mould growth
  • 2008 GB/T 2423.16-2008 Environmental testing for electric and electronic products.Part 2:Test methods.Test J and guidance:Mould growth
  • 1999 GB/T 2423.16-1999 Environmental testing for electric and electronic products-- Part 2: Tests--Test J and guidance: Mould growth

GB/T 2423.16-2022 -All Parts

GB/T 2423.1-2008 Environmental testing for electric and electronic products.Part 2:Test methods.Tests A:Cold GB/T 2423.10-2019 Environmental testing—Part 2:Test methods—Test Fc:Vibration(sinusoidal) GB/T 2423.101-2008 Environmental testing for electric and electronic products.Part 2:Test methods.Test: Inclinations and swings GB/T 2423.102-2008 Environmental testing for electric and electronic products.Part 2:Test method.Test:combined temperature(cold and heat)/low air pressure/vibration(sinusoidal) GB/T 2423.11-1997 Environmental testing for electric and electronic products. Part 2: Test methods. Test Fd: Random vibration wide band--General requirements GB/T 2423.12-1997 Environmental testing for electric and electronic products. Part 2: Test methods. Test Fda: Random vibration wide band--Reproducibility high GB/T 2423.13-1997 Environmental testing for electric and electronic products. Part 2: Test methods. Test Fdb: Random vibration wide band--Reproducibility medium GB/T 2423.14-1997 Environmental testing for electric and electronic products. Part 2: Test methods. Test Fdc: Random vibration wide band--Reproducibility low GB/T 2423.15-2008 Environmental testing for electric and electronic products.Part 2:Tests methods.Test Ga and guidance:Acceleration,steady GB/T 2423.16-2022 Environmental testing—Part 2: Test methods—Test J and guidance: Mould growth GB/T 2423.17-2024 Environmental testing Part 2: Test methods Test Ka: Salt spray GB/T 2423.18-2021 Environmental testing—Part 2: Test methods—Test Kb:Salt mist, cyclic（sodium chloride solution） GB/T 2423.19-2013 Environmental testing.Part 2:Test methods.Test Kc:Sulphur dioxide test for contacts and connections GB/T 2423.2-2008 Environmental testing for electric and electronic products.Part 2:Test methods.Tests B:Dry heat GB/T 2423.20-2014 Environmental testing.Part 2: Test methods.Test Kd: Hydrogen sulphide test for contacts and connections GB/T 2423.21-2008 Environmental testing for electric and electronic products.Part 2 Test methods Test M:Low air pressure GB/T 2423.22-2012 Environmental testing.Part 2:Test methods.Test N:Change of temperature GB/T 2423.23-2013 Environmental testing.Part 2:Test methods.Test Q:Sealing GB/T 2423.24-2022 Environmental testing—Part 2: Test methods—Test S: Simulated solar radiation at ground level and guidance for solar radiation testing and weathering GB/T 2423.25-2008 Environmental testing for electric and electronic products.Part2:Tsets Tset Z/AM:Combined cold/low air pressure tests GB/T 2423.26-2008 Environmental testing for electric and electronic products.Part 2 Test methods TestZ/BM:Combined dry heat/low air pressure tests GB/T 2423.27-2020 Environmental testing—Part 2: Test methods—Test method and guidance: Combined temperature or temperature and humidity with low air pressure tests GB/T 2423.28-2005 Environmental testing for electric and electronic products.Part2:Test methods-Test T:Soldering GB/T 2423.29-1999 Environmental testing for electric and electronic products-- Part 2:Test methods Test U:robustness of terminations and integral mounting devices GB/T 2423.3-2016 Environmental testing—Part 2：Testing method—Test Cab:Damp heat,steady state


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