The GB/T 9755—2024 standard for "Synthetic Resin Emulsion Wall Coatings", which will be officially implemented on June 1, 2025, merges and replaces the previous GB/T 9755—2014 standard for "Synthetic Resin Emulsion Exterior Wall Coatings" and GB/T 9756—2018 standard for "Synthetic Resin Emulsion Interior Wall Coatings". It aims to better regulate the building interior and exterior wall coating market and adapt to the development trend of high-end and multifunctional products.

Primer Requirements and Changes

Interior Wall Primer

The new standard divides interior wall primers into Type I and Type II. Type I adds a strengthening performance requirement (similar to the interior wall penetrating primer in JG/T 210—2018); Type II remains consistent with the primer standard in the original GB/T 9756—2018.

Exterior Wall Primer

Added low-temperature film-forming requirements; improved alkali resistance index, Type I increased from 72 hours in GB/T 9755—2014 to 120 hours, Type II increased from 48 hours to 72 hours; adjusted water permeability index, Type I increased from 0.3 in GB/T 9755—2014 to 0.4, Type II increased from 0.5 to 1.0; both Type I and Type II also added strengthening performance requirements.

Interior Wall Paint Requirements and Changes

In the new standard, the number of scrub resistance cycles for qualified interior wall paints has been increased from 350 in the original GB/T 9756—2018 to 500, significantly raising the threshold for qualified products.

Exterior Wall Paint Requirements and Changes

Added low-temperature film-forming requirements; cancelled water permeability requirements; improved artificial climate aging performance index, increased from 250 hours, 400 hours, 600 hours in GB/T 9755—2014 to 300 hours, 600 hours, 800 hours, respectively.

In addition to changes in testing items and technical indicators, the new standard also improves and revises testing methods, such as the brushes used in the scrub resistance test and the requirements for the test substrate in the water permeability test, making the testing methods more scientific and accurate. These improvements will help promote product technological progress and enterprise technological innovation, and promote the overall development of the building coatings industry.