ASTM C1177 (Standard Specification for Glass Mat Gypsum Substrate Panels)

ASTM C1177 is a standardized guideline that specifies the requirements for glass mat gypsum panels, which are durable, moisture-resistant panels used as a substrate in wall and ceiling applications. These panels are made with gypsum core reinforced with fiberglass mats, providing strength and resistance to mold and water. The standard sets quality criteria for manufacturing, dimensions, and performance to ensure safety, durability, and compatibility with finishing materials. Essentially, ASTM C1177 ensures that glass mat gypsum panels meet consistent quality standards for construction and renovation projects, promoting reliable and long-lasting wall systems.