GB/T 4706.99-2024 in English

GB/T 4706.99-2024 Standard Overview

GB/T 4706.99-2024 "Safety of Household and Similar Electrical Appliances Part 99: Particular Requirements for Thermal Storage Electric Hand Warmers" is a safety standard for thermal storage electric hand warmers, replacing the old version GB 4706.99-2009. This standard specifies in detail the design, manufacturing, testing and use requirements of thermal storage electric hand warmers to ensure the safety of the product under normal use conditions.

Comparison of standard frameworks

Technology evolution analysis

The new version of the standard has made important improvements in the following aspects:

• Added test description after heat storage process: to ensure the safety of the product after long-term use.
• Added flexible material tear resistance test: to improve the safety requirements for flexible products.
• Optimized signs and instructions requirements: added warning content such as "Do not add heat storage liquid medium by yourself".

Explanation of professional terms and practical application

Take the heat storage electric hand warmer as an example, its core components are the heat storage core and the electric heating element. In normal use, users should be careful to avoid covering or over-extruding the product (the temperature rise of the test corner wall does not exceed 75K). At the same time, flexible products need to withstand tear and extrusion tests (the breaking load is not less than 12.5N).

Implementation suggestions

To ensure compliance with GB/T 4706.99-2024 standard, manufacturers should:

• Strictly test according to the test conditions (the ambient temperature is controlled at 23°C±2°C).
• Optimize the product structure design to avoid the detachable cover affecting the safety performance.
• Increase the details of user warning information and instructions for use (such as "do not rinse with water").