05-26-2026 GB 18580-2025 Indoor Decorating and Refurbishing Materials — Limit of Formaldehyde Emission from Wood-based Panels and Finished Productswill officially take effect on June 1, 2026. The standard establishes the E0 grade (≤0.050 mg/m³) as a mandatory market access threshold for wood-based panel finished products intended for indoor use (e.g., wooden doors, flooring, custom cabinets), replacing the previous E1 grade (≤0.124 mg/m³). However, the phrase "E0 grade is included in mandatory standards for the first time" is inaccurate; the E0 classification has existed since GB/T 39600-2021 as a recommended (voluntary) grading. This update marks the first time it has been set as a statutory minimum requirement for indoor finished products within a mandatory national standard.