The environmental certification of polyurethane sealant revolves around the control of harmful substances such as VOCs, free isocyanates, formaldehyde, and heavy metals. In China, green product certification and green building material certification are the main focus, while internationally common certifications include CE, EMICODE, and Finnish M1.
1、 Domestic mainstream environmental certification and standards
- Green Product Certification (National Unified Certification, highest level)
According to the standard:
GB/T 35609-2025 “Evaluation of Waterproof and Sealing Materials for Green Products”
CNCA-CGP-08:2021 Implementation Rules for Green Product Certification (Waterproof and Sealing Materials)
Key environmental indicators (PU sealant):
VOC: Single component ≤ 50 g/L (GB 33372-2020)
Free isocyanate (TDI/HDI): ≤ 0.5%
Quality loss rate: Green products ≤ 4%, benchmark ≤ 2%
Formaldehyde, benzene, toluene+xylene, heavy metals: all meet the national standard limits
Certification Mark: Little Green Leaf (National Unified Green Product Label) - Green building material certification (three-star/two star/one star)
Basis: Management Measures for Evaluation and Labeling of Green Building Materials
Applicable: Construction engineering procurement, green building rating (lowest one star, highest three stars)
Core: VOC, free isocyanates, heavy metals, anti mold performance (T/CECS 10490-2025) - Mandatory/Recommended Basic National Standards
GB 33372-2020: VOC Limits for Adhesives (Mandatory)
Single component polyurethane sealant: VOC ≤ 50 g/L
JC/T 482-2022: Polyurethane Building Sealants (Industry)
GB 18583-2008: Limit of harmful substances in indoor adhesives (old standard gradually replaced by GB 33372)
2、 International mainstream environmental certification
EU CE certification: meets EU building materials safety, environmental protection, and health requirements
Germany EMICODE (GEV):
EMICODE EC1 Plus (highest) EC1、EC2
Extremely strict VOC, formaldehyde, and odor emissions
Finland M1 certification: Classification of volatile compounds in building materials (M1 has the lowest volatility, better than the national standard)
EPD (Environmental Product Declaration): ISO 14025/EN 15804, Full Life Cycle Environmental Data
3、 Key points for selection and certification
Priority view: Green Product Certification (Little Green Leaf) or Green Building Materials Samsung
Required indicators:
VOC ≤ 50 g/L (single component)
Free isocyanate ≤ 0.5%
Formaldehyde free, benzene free, low heavy metal content
Indoor/Home Decoration: Choose EC1 Plus, M1, Green Product Certification Products
Engineering procurement: Government projects often require green building materials/green product certification
4、 Certification body (domestic)
China National Building Material Inspection and Certification Group (CTC)
Zhongke Green Label, National Inspection Group, Fangyuan Certification, etc