GB21976.4-2012
Escape apparatus for building fire - Part 4: Escape slide
建筑火灾逃生避难器材 第4部分：逃生滑道
GB 21976.4-2012 is a current mandatory Chinese national standard for Escape apparatus for building fire - Part 4: Escape slide. It appears in the Construction compliance cluster with a product safety focus and has an implementation date of Dec 1, 2012.
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 flexible escape slides designed for building fire evacuations, where users descend by their own weight at a controlled speed. It specifically covers slides with a configuration height not exceeding 60 meters that are intended for repeated use. It is mandatory for manufacturers producing fire escape apparatus for buildings in China. The standard does not apply to rigid escape chutes or disposable descent devices.
Technical requirements
The standard outlines comprehensive technical specifications for escape slides, focusing on structural integrity, material properties, and operational performance. Structurally, the slide must consist of an entrance metal frame, metal connectors, and a multi-layer slide body comprising an outer protective layer, an intermediate damping layer, and an inner guide layer. Material requirements mandate rigorous testing for flame retardancy, ensuring the protective layer does not melt or drip, with strict limits on damaged length and afterflame time. Additionally, the materials must meet specific thresholds for breaking strength, tear strength, and seam strength to withstand the physical stresses of evacuation. For slides incorporating rubber, physical mechanical properties including tensile strength and heat aging resistance are specified. Performance criteria are critical for user safety. The standard sets maximum limits for the sliding speed and landing speed under minimum, standard, and maximum loads to prevent injury. Furthermore, the slide must demonstrate high reliability by enduring repeated descent tests without structural failure, and all metal components must possess adequate corrosion resistance. Compliance with these performance metrics is essential for market access.
Testing methods
Testing procedures include visual and dimensional inspections for structural and appearance quality. Material tests evaluate flame retardancy (referencing GB/T 5455), breaking strength (GB/T 3923.1), and tear strength (GB/T 3917.3). Performance testing involves measuring the elongation rate under specific tensile loads, assessing overall tensile strength, and conducting timed sliding and landing speed trials with standardized sandbag weights. Reliability is verified through 100 consecutive maximum-load descents, while corrosion resistance is tested via a 120-hour neutral salt spray test.
FAQs
What products are regulated under GB 21976.4-2012?
This standard regulates flexible escape slides used in building fire evacuations that rely on the user's body weight for descent and are designed for heights up to 60 meters.
Are the technical requirements in GB 21976.4-2012 mandatory?
Yes, Chapters 4, 6, and 7.1 are mandatory, covering technical requirements, inspection rules, and marking. The remaining chapters are recommended.
What are the key performance tests required for compliance?
Key performance tests include measuring the sliding speed and landing speed under various loads, verifying overall tensile strength, and conducting a reliability test involving 100 consecutive descents.
The summary above provides a high-level overview of GB 21976.4-2012. 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 21976.4-2012 today to access all detailed parameters, tables, and testing procedures.
Applicability hints
- Type
- Product
- CCS
- C85
- ICS
- 13.220.10
- Competent department
- National Fire and Rescue Administration
- Technical committee
- National Technical Committee on Fire Protection of Standardization Administration of China