GB 46028-2025 Safety technical requirements for building decorative stone English, Anglais, Englisch, Inglés, えいご
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ICS 91.100.15 CCS Q21
People's Republic of China National Standard
GB 46028-2025
Safety Technical Requirements for Building Decorative Stone
Issued on August 1, 2025
Implemented on August 1, 2026
Issued by
State Administration for Market Regulation
Standardization Administration of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Safety Technical Requirements
5 Test Methods
6 Inspection Rules
7 Additional Requirements
1 Scope
This document specifies the safety technical requirements, test methods, inspection rules, and other requirements for building decorative stones.
It applies to natural stone, synthetic stone, adhesives, and protective agents used in building decoration.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute essential requirements. For dated references, only the cited version applies; for undated references, the latest version (including amendments) applies.
GB/T 1725: Paints, varnishes, and plastics - Determination of non-volatile matter content
GB 6566: Limits of radioactive nuclides in building materials
GB/T 6750: Paints and varnishes - Determination of density - Pycnometer method
GB/T 9966.2: Test methods for natural stone - Part 2: Flexural strength after drying, water saturation, and freeze-thaw cycles
GB/T 13890: Classification and terminology for natural stone
GB/T 23985-2009: Paints and varnishes - Determination of volatile organic compound (VOC) content - Differential method
GB/T 23986.2-2023: Paints and varnishes - Determination of volatile organic compounds (VOC) and/or semi-volatile organic compounds (SVOC) - Part 2: Gas chromatography
GB/T 23990-2009: Determination of benzene, toluene, ethylbenzene, and xylene in coatings - Gas chromatography
GB/T 23993: Determination of formaldehyde content in water-based coatings - Acetone spectrophotometry
GB/T 24264: Adhesives for facing stone
GB 30982: Limit of harmful substances in construction adhesives
GB 33372-2020: Limits of volatile organic compounds in adhesives
GB/T 34682-2017: Determination of volatile organic compound (VOC) content in coatings containing active diluents
GB/T 35160.2: Test methods for synthetic stone - Part 2: Determination of flexural strength
GB/T 35165: Classification and terminology for synthetic stone
GB/T 41953: Paints and varnishes - Determination of water content - Gas chromatography
JC/T 887: Epoxy adhesives for dry-hanging stone curtain walls
3 Terms and Definitions
Terms defined in GB 6566, GB/T 13890, and GB/T 35165, as well as the following, apply:
3.1 Building Decorative Stone
Stone products used for architectural, municipal, and decorative purposes.
Note: Includes natural and synthetic stone.
4 Safety Technical Requirements
4.1 Building Decorative Stone
4.1.1 Radioactive Nuclide Limits
Natural granite shall comply with the radioactive nuclide limits in Table 1.
Table 1 Radioactive Nuclide Limits for Natural Granite
Category Interior Surfaces of Class I Civil Buildingsa Interior Surfaces of Class II Civil Buildingsb and Industrial Buildings
a Class I: Residential buildings, hospitals, schools.
b Class II: Offices, shopping malls.
4.1.2 Panel Thickness
Dry-mounted natural stone and synthetic stone (mirror-finished and fine-finished panels) shall comply with Table 2.
Table 2 Thickness Requirements for Dry-Mounted Panels
(Unit: mm)
Material Type Thickness (Minimum)
Natural Granite 15
Natural Marble 20
Natural Limestone/Sandstone 25
Resin-Based Synthetic 12
Inorganic-Based Synthetic 15
4.1.3 Flexural Strength
Dry-mounted natural and synthetic stone shall comply with Table 3.
Table 3 Flexural Strength Requirements
Material Type Flexural Strength (MPa)
Natural Granite ≥ 8.0
Natural Marble ≥ 7.0
Natural Limestone ≥ 4.0
Natural Sandstone ≥ 6.9
Resin-Based Synthetic ≥ 12.0
Inorganic-Based Synthetic ≥ 10.0
4.1.4 Freeze-Thaw Resistance
Outdoor dr-mounted natural stone and inorganic-based synthetic stone shall have a frost resistance coefficient of ≥ 80%.
