GB/T 25975-2018 in English
VALIDRock wool products for external thermal insulation composite systems(ETICS)
- Issued on:2018-07-13
- Implemented on:2019-06-01
- File Format:PDF
- Delivery:Within 1 day
$117.00
《GB/T 25975-2018建筑外墙外保温用岩棉制品》由TC191（全国绝热材料标准化技术委员会）归口，主管部门为中国建筑材料联合会。
Introduction
GB/T 25975—2018 Standard Overview
GB/T 25975—2018 Rockwool products for external thermal insulation of building exterior walls is China's latest standard for rockwool products for external thermal insulation systems of exterior walls, replacing the previous GB/T 25975—2010 version. This standard mainly regulates the technical requirements, test methods and inspection rules for rockwool boards and rockwool strips.
Background of Standard Revision and Technological Evolution
This revision adds a number of new contents, including:
- Newly added “rock wool strip” term (see 3.1.1)
- Increased density tolerance and test method (see 5.3, 6.3)
- Newly added potassium oxide and sodium oxide content requirements and test methods (see 5.5, 6.7)
- Introduced volume water absorption test requirements (see 5.10, 6.12)
- Reinforced shear strength and shear modulus requirements for rock wool strips (see 5.14, 6.16)
Comparison of Standard Frameworks
| Items | Requirements of the 2010 Edition | Additions/Modifications to the 2018 Edition |
|---|---|---|
| Definition of terms | Only define “rock wool belt” | Add definition of “rock wool strip” |
| Classification and marking | Classification of rock wool strips is not clear | New classification of rock wool strips (TR100) and detailed marking rules |
| Thermal conductivity requirements | The unified requirement is ≤0.040 W/(m·K) | New upper limit of thermal conductivity of rock wool strips (≤0.046 W/(m·K)) |
Implementation suggestions and precautions
Case Analysis: When choosing to use rock wool strips in a building exterior wall insulation project, special attention should be paid to the following points:
- Ensure that the shear strength and modulus of the rock wool strips meet the requirements of Table 5 (≥20 kPa and ≥1.0 MPa)
- Check whether the tensile strength retention rate under hot and humid conditions meets the 50% requirement
- Choose an appropriate test method, such as GB/T 30804 to measure vertical tensile strength
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