ASTM C920 is a widely recognized standard specification for elastomeric joint sealants used in construction. This paper provides an in-depth evaluation of ASTM C920 sealants, examining their properties, applications, and performance. The standard covers various types of sealants, including single-component and multi-component systems, and outlines requirements for their characterization, testing, and quality control. The aim of this review is to provide a comprehensive understanding of ASTM C920 sealants, their advantages, limitations, and best practices for their selection, application, and maintenance.
ASTM C920 sealants are characterized by their elastomeric properties, which enable them to accommodate joint movements and maintain a watertight seal. The standard requires sealants to exhibit specific properties, including:
ASTM C920 sealants are widely used in construction applications due to their elastomeric properties, durability, and ease of application. This review has highlighted the properties, applications, and performance of ASTM C920 sealants, as well as their advantages, limitations, and best practices for their selection, application, and maintenance. By understanding the characteristics and requirements of ASTM C920 sealants, builders, engineers, and maintenance professionals can ensure the optimal performance and durability of these critical components in construction. astm c 920 sealant
A sealant labeled ASTM C920, Class 50, Grade NS, Use NT is a non-sag sealant for vertical curtain wall joints that can handle ±25% movement.
If you are looking for a physical piece of sealant for a project, you generally need to request a and a sample from a manufacturer. Common brands that meet ASTM C 920 include: ASTM C920 is a widely recognized standard specification
This indicates the percentage of movement (expansion and compression) a sealant can handle relative to its original joint width. Movement Capability Common Applications Low-movement interior trim or molding. 25 Standard window perimeters and expansion joints. 35 High-performance joints, such as pre-cast concrete panels. 50 High-movement curtain walls and glazing systems. 100/50 +100% / -50% Extreme asymmetric movement (expansion up to 100%). 4. Use: Application Environment and Substrates
When a product is rated under this standard, it is categorized by four primary variables: , Grade , Class , and Use . Understanding these codes is essential for matching a sealant to the specific needs of a project. 1. Type: Number of Components The aim of this review is to provide
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Here is what you need to know about the industry’s benchmark for elastomeric joint sealants.
What movement class do you typically specify for curtain wall joints? Let us know below. 👇
However, there are also limitations: