GB4706.99-2009
Household and similar electrical appliances - Safety - Particular requirements for thermal-storage hand warmers
家用和类似用途电器的安全 储热式电热暖手器的特殊要求
GB 4706.99-2009 is a current mandatory Chinese national standard for Household and similar electrical appliances - Safety - Particular requirements for thermal-storage hand warmers. It appears in the Electronics compliance cluster with a product safety focus and has an implementation date of Nov 1, 2010.
Applicability depends on product scope, certification route, competent authority notices and transition rules. Requst for the translation or verify source before using this record in a compliance decision.
Compliance overview
Scope and applicability
This standard applies to the safety of thermal storage electric hand warmers and similar appliances for household and similar uses, with a rated voltage not exceeding 250V. It specifically covers both hard shell and flexible hand warmers that store thermal energy in a core and release it naturally while disconnected from the power supply. This standard does not apply to non-thermal-storage hand warmers, electric blankets, or foot warmers, which are governed by separate standards such as GB 4706.8 and GB 4706.80.
Technical requirements
GB 4706.99-2009 establishes mandatory safety requirements by modifying and supplementing the general standard GB 4706.1-2005. A key requirement is that appliances must be classified as Class II or Class III, with Class III appliances not exceeding 24V. Manufacturers must ensure strict adherence to these classification and marking requirements to guarantee user safety. The standard specifies critical structural and mechanical integrity requirements. For flexible hand warmers, the design must include overpressure protection to prevent rupture during heating, and internal wiring must be integrated with the heating element insulation. Flexible enclosures must also demonstrate adequate tear resistance and withstand specific crushing tests without leakage. Regarding thermal and abnormal operation safety, the standard defines maximum temperature limits for the hand warmer surface and surrounding test surfaces. During abnormal operation tests, such as covering the device with thermal insulation material, the surface temperature rise must not exceed 155K to prevent burn hazards. Compliance with these thermal limits is critical for market access. Additionally, the standard outlines specific requirements for marking and instructions. Appliances must be clearly marked with warnings such as "do not use while powered" and "do not insert pins" (for flexible types). User manuals must explicitly state that the device is not intended for use by infants or persons insensitive to heat.
Testing methods
The standard mandates several rigorous evaluation procedures to verify compliance. The mechanical strength test involves dropping the appliance from a height of 900mm onto a hardwood board. For flexible enclosures, a specialized apparatus is used to test material fatigue and tear resistance, alongside a crushing test using an 80kg weight. These tests ensure the structural integrity of the enclosure under foreseeable misuse. Thermal safety is evaluated through normal operation and abnormal operation tests, measuring temperature rises against strict limits. Furthermore, flexible materials must undergo a spark ignition test to verify flame retardancy, where samples are exposed to electrical sparks in a heated environment to measure ignition time. Only appliances passing these comprehensive safety assessments are considered compliant.
FAQs
What products are regulated under GB 4706.99-2009?
This standard specifically regulates thermal storage hand warmers with a rated voltage not exceeding 250V. It explicitly excludes non-thermal-storage hand warmers, electric blankets, and foot warmers, which are covered by other standards such as GB 4706.8 and GB 4706.80.
How does GB 4706.99-2009 relate to GB 4706.1?
It must be used in conjunction with GB 4706.1-2005 (the general safety requirements for household appliances). GB 4706.99-2009 modifies, adds to, or replaces specific clauses of the base standard to address the unique safety hazards of thermal storage hand warmers.
Are there specific marking and user instruction requirements for these hand warmers?
The standard mandates specific safety warnings, such as "do not cover" for hard shell warmers and "do not insert pins" for flexible warmers. Manufacturers must also include detailed user instructions warning against use by infants or heat-insensitive persons and advising against placing heavy objects on the device during charging.
The summary above provides a high-level overview of GB 4706.99-2009. To ensure complete compliance for your products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 4706.99-2009 today to access all detailed parameters, tables, and testing procedures.
Applicability hints
- Type
- Safety
- CCS
- Y63
- ICS
- 13.120
- Competent department
- Ministry of Industry and Information Technology
- Technical committee
- Ministry of Industry and Information Technology