ASTM C631-09 (R2020) PDF Download

ASTM C631-09 (R2020) outlines the minimum requirements for bonding compounds used to adhere interior gypsum plasters to structurally sound surfaces. The bonding compound needs to be a tinted film-forming material that can be applied using a brush, roller, or spray. It should have a composition that is non-oxidizing, non-toxic, and non-flammable. The consistency of the compound should be smooth, homogeneous, and flexible, without any settling of the solids. It should be free of foreign matter and not noticeably affected by mild acid or alkali.

The standard specifies the apparatus required for preparing the bonding compound, such as a moist cabinet, forced drift type oven, freezer, balance, timing device, tamper, steel straight edge, metal-bladed spatula, paintbrush, briquet testing machine, briquet molds, divider, and clips. The compound needs to undergo various tests to determine its performance requirements, including bonding capability, degradation, high-temperature stability, freeze-thaw stability, and bond strength.

The standard provides an abstract that summarizes its content and scope, mentioning the purpose of the specification and the test methods included. It serves as a guideline for manufacturers and users of bonding compounds for interior gypsum plasters, ensuring that the products meet the minimum requirements and perform satisfactorily in terms of adhesion and durability in various conditions and scenarios.