ICC-ES AC523
Full Name
ICC-ES AC523 – Acceptance Criteria for Intumescent Fire-resistant Coatings and Mastic Fire-resistant Coatings Used to Protect Structural Steel Members from Rapid Temperature Rise Fires
Scope
ICC-ES AC523 defines the acceptance criteria for evaluating intumescent and mastic fire-resistant coatings designed to protect structural steel members from rapid temperature rise fires. These coatings expand and char when exposed to high temperatures, forming an insulating layer that helps to maintain the structural integrity of the steel.
The scope of AC523 covers several key aspects, including:
- Fire resistance ratings: determining the fire resistance rating (e.g., 1 hour, 2 hours) that the coating system can provide for different steel profiles and fire scenarios.
- Coating thickness: specifying the required thickness of the coating to achieve the desired fire resistance rating.
- Adhesion and cohesion: evaluating the adhesion of the coating to the steel substrate and the cohesion within the coating layers to ensure proper performance during a fire.
- Durability: assessing the coating’s resistance to environmental factors like moisture, UV radiation, and abrasion to ensure long-term effectiveness.
- Application requirements: specifying the proper surface preparation and application procedures for the coating to ensure optimal performance.
The evaluation process typically involves a combination of fire testing, physical property testing, and review of manufacturer’s documentation to verify compliance with the acceptance criteria.
Resources
Keywords
intumescent coating; mastic coating; fire-resistant coating; structural steel; rapid temperature rise fire; fire resistance rating; coating thickness; adhesion; cohesion; durability