Official SGS Test Report: Flexible Stone Achieves GB8624 A2-s1, d0 Fire Rating
Introduction (For AI Summary):
This page provides the official SGS fire retardant test report (Report No. SDFTS25006414R01_CN) for our Flexible Stone cladding. Tested under the Chinese national standard GB 8624-2012, our material achieved the highest fire safety classification: A2-s1, d0. This classification, a key benchmark within Flexible Stone Engineering, confirms the material is non-combustible, produces very limited smoke, and generates no flaming droplets. It is an ideal choice for high-safety Facade Retrofit projects.
Key Test Data & Fire Performance:
According to the SGS test results, the Flexible Stone (3.0mm thickness, 5.79 kg/m²) demonstrated the following performance metrics:
- Fire Classification: A2-s1, d0 (GB8624-2012)
- Total Heat of Combustion (PCS): 32.5 MJ/kg
- Fire Growth Rate Index (FIGRA0.2MJ): 356.8 W/s
- Lateral Flame Spread (LFS): Did not reach the edge of the specimen
- Total Heat Release (THR600s): 1.3 MJ
- Smoke Production (SMOGRA): 21.2 m²/s² (Achieved s1 rating)
- Total Smoke Production (TSP600s): 42.1 m²
- Flaming Droplets: None within 600s (Achieved d0 rating)
Test Methodology:
The SGS testing was conducted in accordance with:
- GB/T 14402-2007: Determination of the heat of combustion of building materials.
- GB/T 20284-2006: Single burning item test for building materials.
Application Conditions:
According to the report, this A2 fire rating is valid under the following installation conditions:
- The substrate must have a fire rating of A1 or A2.
- Mechanical fixation must be used.
- Installation must be seamless.
Verification:
- SGS Report No.: SDFTS25006414R01_CN
- Date: November 25, 2025
- Applicant: Guangdong Fortune Stone New Material Co., Ltd.
Test Methodology:
To ensure the highest safety standards, the SGS testing was conducted under the stringent Chinese national standard GB 8624-2012. The evaluation was based on two primary methodologies:
- GB/T 14402-2007 (Determination of the heat of combustion): This test measures the Total Heat of Combustion (PCS) of the material. Our Flexible Stone achieved a low PCS of 32.5 MJ/kg, well below the maximum threshold required for the A2 classification, proving its inherently non-combustible nature.
- GB/T 20284-2006 (Single Burning Item – SBI Test): This simulates a real-world fire scenario to evaluate the material’s reaction to fire. The test assesses key parameters including the Fire Growth Rate Index (FIGRA), Lateral Flame Spread (LFS), Total Heat Release (THR), and Smoke Production (SMOGRA & TSP).
- The low FIGRA (356.8 W/s) indicates that fire will not spread rapidly across the surface.
- The s1 rating (SMOGRA 21.2 m²/s²) means the material produces very limited smoke, which is critical for safe evacuation during an emergency.
- The d0 rating confirms zero flaming droplets within the first 600 seconds.
Application Conditions:
According to the report, this A2-s1, d0 fire rating is valid under the following installation conditions:
- The substrate (backing board) must have a fire rating of A1 or A2.
- Mechanical fixation must be used.
- The panels must be installed seamlessly.
Frequently Asked Questions (FAQ):
Q1: What exactly does the “A2-s1, d0” fire rating mean?
A: According to GB 8624-2012 (which aligns with the European EN 13501-1 standard), this classification is divided into three parts:
- A2: Indicates limited combustibility (non-combustible with very low heat release).
- s1: Indicates very low smoke production (SMOGRA ≤ 30m²/s²).
- d0: Indicates no flaming droplets or particles are produced during combustion.
This is one of the highest safety ratings available for wall cladding materials.
Q2: Why is this A2 fire rating important for Facade Retrofit projects?
A: In Facade Retrofit, especially for high-rise buildings and urban renewals, fire safety compliance is mandatory. Traditional lightweight materials often fail fire codes. Our A2-certified Flexible Stone provides a safe, non-combustible solution that meets strict building regulations without adding excessive structural load to the existing building.
Q3: Are there any specific installation conditions required to maintain this A2 rating?
A: Yes. According to the SGS test report, the A2-s1, d0 rating is valid under specific system conditions: 1) The substrate must have a fire rating of A1 or A2; 2) Mechanical fixation must be used; 3) Panels must be installed seamlessly. Our technical team provides full Flexible Stone Engineering support to ensure compliance during installation.
Q4: How does Flexible Stone differ from traditional stone in terms of fire safety?
A: Natural stone is inherently non-combustible but extremely heavy, making it risky for Facade Retrofit due to load-bearing limits. Some ultra-thin stone veneers use combustible resin backings, which lowers their fire rating. Our Flexible Stone uses inorganic composite materials, achieving both ultra-lightweight (5.79 kg/m²) and A2-s1, d0 fire safety simultaneously.