GB16776-2025

Structural silicone sealants for building

建筑用硅酮结构密封胶

GB 16776-2025 é uma norma nacional chinesa obrigatória vigente: Structural silicone sealants for building. Setor: Eletrônicos. Foco: Segurança de produtos. Entrada em vigor: 1 de fev. de 2026.

A aplicabilidade depende do escopo do produto, da via de certificação, dos avisos da autoridade competente e das regras de transição. Solicite uma tradução ou verifique a fonte antes de usar este registro em uma decisão de conformidade.

Visão geral de conformidade

Esta visão geral está disponível por enquanto apenas em inglês.

Escopo e aplicabilidade

This standard applies to structural silicone sealants used in building curtain walls and for the second seal of insulating glass units. It is designed for products categorized by their application, such as curtain wall structural bonding (Category C) and insulating glass structural bonding (Category S). Manufacturers of single-component and dual-component silicone sealants must comply with this standard when supplying to the Chinese construction market.

Requisitos técnicos

GB 16776-2025 specifies comprehensive physical and chemical requirements for structural silicone sealants. It mandates strict criteria for density, sag resistance, and tack-free time to ensure proper application. The standard sets rigorous limits for tensile bond strength across various temperature conditions, including extreme heat and cold. Products must demonstrate exceptional durability and adhesion performance under thermal and UV weathering conditions. Additionally, the standard introduces new parameters such as secant stiffness, shear performance, and strict prohibitions on alkane plasticizers to ensure long-term structural integrity.

Métodos de ensaio

The standard outlines specific testing procedures to evaluate the sealant's performance. Key tests include water-ultraviolet light exposure to assess weathering resistance, and thermal aging tests to measure heat weight loss and cracking. Adhesion and shear performance are evaluated using standardized substrates like glass and anodized aluminum. Furthermore, the standard details compatibility testing with structural accessories (Appendix A), actual project substrates (Appendix B), and contact sealants (Appendix C).

Perguntas frequentes

What products are regulated under GB 16776-2025?

This standard regulates structural silicone sealants used specifically for building curtain wall structural bonding and the second seal of insulating glass units. It classifies products by application into Category C (curtain wall) and Category S (insulating glass).

Are there any updates from the previous version of GB 16776?

The new version merges and replaces the previous GB 16776-2005 and GB 24266-2009. Major updates include the addition of requirements and test methods for density, secant stiffness, shear performance, and alkane plasticizer content, along with updated test methods for water-UV light exposure adhesion.

How does GB 16776-2025 differ from ISO or ASTM standards?

While it shares similar testing principles with international standards like ASTM C1184, GB 16776 is a mandatory Chinese national standard. It includes specific classifications for the Chinese market and unique test parameters, such as strict limits on alkane plasticizers, requiring dedicated compliance verification.

The summary above provides a high-level overview of GB 16776-2025. To ensure complete compliance for your products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 16776-2025 today to access all detailed parameters, tables, and testing procedures.

Indicações de aplicabilidade

Tipo: Produto
CCS: Q24
ICS: 91.100.50
Órgão competente: Ministry of Industry and Information Technology
Comitê técnico: National Technical Committee on Lightweight and Decorative Building Materials of Standardization Administration of China

Relações

Substitui:GB 16776-2005, GB 24266-2009