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GB 16776-2025: Structural silicone sealants for building
Status: Valid GB 16776: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB 16776-2025 | English | 439 |
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4 days [Need to translate]
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Structural silicone sealants for building
| Valid |
GB 16776-2025
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| GB 16776-2005 | English | 549 |
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4 days [Need to translate]
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Structural silicon sealants for building
| Valid |
GB 16776-2005
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| GB 16776-1997 | English | 519 |
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4 days [Need to translate]
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Structural silicone sealants for building
| Obsolete |
GB 16776-1997
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Standard similar to GB 16776-2025 GB/T 51033 GB/T 50082 Basic data | Standard ID | GB 16776-2025 (GB16776-2025) | | Description (Translated English) | Structural silicone sealants for building | | Sector / Industry | National Standard | | Classification of Chinese Standard | Q24 | | Classification of International Standard | 91.100.50 | | Word Count Estimation | 22,248 | | Date of Issue | 2025-08-01 | | Date of Implementation | 2026-02-01 | | Older Standard (superseded by this standard) | GB 16776-2005, GB 24266-2009 | | Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China | GB 16776-2025: Structural silicone sealants for building---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB16776-2025
ICS 91.100.50
CCSQ24
National Standard of the People's Republic of China
Replaces GB 16776-2005, GB 24266-2009
Silicone structural sealant for construction
Released on August 1, 2025
Implementation on February 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB 16776-2005 "Silicone structural sealants for building" and GB 24266-2009 "Silicone structural sealants for insulating glass
Compared with GB 16776-2005 and GB 24266-2009, in addition to structural adjustments and editorial changes, the main technical changes are
as follows.
--- Added classification by purpose (see Chapter 4);
--- Increased the requirements and test methods for density, secant stiffness, shear properties, and alkane plasticizer content (see 5.2, 6.5, 6.11.1.2,
6.12 and 6.15);
--- Changed the requirements for tensile modulus and thermal weight loss (see 5.2, 5.2 and 5.4 of GB 16776-2005);
--- Changed the requirements and test methods for the bond failure area (water-ultraviolet light) (see 5.2, 6.11.1.4, GB 16776-2005
5.2, 6.8.8 of GB 24266-2009 and 4.2.4, 5.8 of GB 24266-2009);
--- Deleted the requirements and test methods for tensile bond strength after immersion in water (see 5.2, 6.8.7 of GB 16776-2005 and GB 24266-
2009 (4.2.4, 5.8);
--- Added the cleaning method of the test substrate in the preparation of adhesion test specimens (see 6.4.1.2);
--- Changed the test method for hardness (see 6.10, 6.7 of GB 16776-2005);
--- Changed the test method for tensile bond strength (water-ultraviolet light) (see 6.11.4, 6.8.8 of GB 16776-2005,
GB 24266-2009, 5.8);
--- Changed the type inspection requirements (see 7.1.2, 7.2 of GB 16776-2005, 6.1.2 of GB 24266-2009);
--- Changed the batching rules (see 7.2, 7.3.1 of GB 16776-2005).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed and coordinated by the Ministry of Industry and Information Technology of the People's Republic of China.
The previous versions of the documents replaced by this document are as follows.
---GB 16776, first issued in.1997 and first revised in.2005;
---GB 24266, first issued in.2009.
Silicone structural sealant for construction
1 Scope
This document specifies the classification and labeling, requirements, test methods, inspection and
Inspection rules as well as marking, packaging, transportation and storage.
This document is applicable to silicone structural adhesives used for the secondary sealing structure bonding of building curtain walls and insulating glass.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 531.1-2008 Test method for indentation hardness of vulcanized rubber or thermoplastic rubber Part 1.Shore hardness tester method (Shore
Hardness)
GB/T 13477.1 Test methods for building sealing materials Part 1.Requirements for test substrates
GB/T 13477.2-2018 Test methods for building sealing materials Part 2.Determination of density
GB/T 13477.5-2002 Test methods for building sealing materials - Part 5.Determination of surface drying time
GB/T 13477.6-2002 Test methods for building sealing materials Part 6.Determination of fluidity
GB/T 13477.8-2017 Test methods for building sealing materials Part 8.Determination of tensile adhesion
GB/T 13477.10-2017 Test methods for building sealing materials Part 10.Determination of constant-tension adhesion
GB/T 13477.18-2002 Test methods for building sealing materials - Part 18.Determination of peel adhesion
GB/T 14682 Terminology of building sealing materials
GB/T 16422.2-2022 Plastics laboratory light source exposure test method Part 2.Xenon arc lamp
GB/T 16422.3-2022 Plastics laboratory light source exposure test method Part 3.Fluorescent ultraviolet lamp
GB/T 22083-2008 Classification and requirements of building sealants
GB/T 31851-2015 Detection method for alkane plasticizers in silicone structural sealants
GB/T 37126-2018 Test methods for building sealants for structural assembly
3 Terms and Definitions
The terms and definitions defined in GB/T 14682 apply to this document.
4 Classification and labeling
4.1 Classification
The products are divided into single component (1) and two components (2) according to their composition.
According to their uses, the products are divided into building curtain wall structural bonding (C) and insulating glass second sealing structural bonding (S).
Products are divided into glass (G), aluminum (AL), and others (Q) according to the substrate used.
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