Official SGS Test Report: Thermal Conductivity of Flexible Stone Reaches 0.171 W/(m·K)
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Discover the SGS thermal conductivity test report for our Flexible Stone. With a low λ-value of 0.171 W/(m·K), it outperforms natural stone in thermal insulation, enhancing energy efficiency for Facade Retrofit projects.
1. Report Overview
This article presents the official SGS test report (Report No. GZIN2509003897PL11_EN) evaluating the thermal conductivity and thermal resistance of our Flexible Stone. Conducted by SGS-CSTC Standards Technical Services Co., Ltd., the test measures the material’s heat transfer properties under standard conditions. The results confirm that our material possesses excellent thermal insulation properties, making it a highly energy-efficient choice for Flexible Stone Engineering and sustainable Facade Retrofit projects.
2. Data Analysis: The Science of Thermal Insulation
According to the test results, the Flexible Stone (2.3mm thickness) demonstrated a thermal conductivity of 0.171 W/(m·K) and a thermal resistance of 0.013 (m²·K)/W.
Engineering Value for Energy Efficiency:
- Superior to Natural Stone: The thermal conductivity of traditional natural stone (like granite) is typically around 2.6 to 3.0 W/(m·K). Our Flexible Stone has a value of only 0.171 W/(m·K), meaning it transfers heat much more slowly, providing over 10 times better thermal insulation than traditional rigid stone cladding.
- Reduces Heat Bridges: In Facade Retrofit projects, preventing heat bridges is crucial. The low thermal conductivity of our material helps reduce the transfer of external heat into the building during hot summers, contributing to lower air conditioning costs and better building energy efficiency.
- Improved Thermal Comfort: Materials with low thermal conductivity do not easily absorb and radiate extreme temperatures. This means the interior walls stay cooler in summer and warmer in winter, enhancing the overall thermal comfort of the occupants.
3. Test Methodology
The SGS evaluation was conducted strictly under the Chinese national standard GB/T 10294-2008 (Thermal insulation – Determination of steady-state thermal resistance and related properties – Guarded hot plate apparatus).
- Test Standard: GB/T 10294-2008
- Specimen Size: 300mm × 299mm × 2.3mm
- Mean Temperature: 40°C
- Temperature Difference: 10°C
- Test Result: Thermal Conductivity: 0.171 W/(m·K); Thermal Resistance: 0.013 (m²·K)/W.
Note: The test report explicitly states that the results should not be cited directly to other use conditions, and is intended for internal quality control and R&D. For official bidding, please reference the specific SGS report number (GZIN2509003897PL11_EN).
4. FAQ
Q1: Is 0.171 W/(m·K) considered a good thermal conductivity for wall cladding?
A: Yes. Traditional stone and ceramic tiles have thermal conductivity values typically ranging from 1.0 to 3.0 W/(m·K). A value of 0.171 W/(m·K) indicates that our Flexible Stone is a poor conductor of heat and acts as a thermal barrier, which is highly beneficial for building energy conservation.
Q2: Can this material replace traditional thick thermal insulation?
A: No. At a thickness of 2.3mm, it cannot replace thick insulation like rock wool or XPS boards. However, it significantly outperforms traditional stone in preventing “heat bridges” and acts as an excellent complementary layer to existing insulation systems in Facade Retrofit projects.
Q3: How does low thermal conductivity benefit the building’s HVAC system?
A: By resisting heat transfer from the outside, the material reduces the thermal load on the building during hot weather. This means the internal air conditioning system doesn’t have to work as hard, leading to lower energy consumption and reduced carbon emissions.
Q4: Does this test comply with international standards for energy-efficient buildings?
A: Yes. The GB/T 10294-2008 standard uses the guarded hot plate method, which is internationally recognized (similar to ISO 8302 and ASTM C177). This data can be confidently used to support green building certifications like LEED or BREEAM.