ASTM C920-18 Specification for Elastomeric Joint Sealants

ASTM C920-18 test method covers the properties of a cured single-or multicomponent cold-applied elastomeric joint sealant for sealing, caulking, or glazing operations on buildings, plazas, and decks for vehicular or pedestrian use. The final results of this method are displayed keeping in view the international standards and inch-pound units.

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ASTM C920-18 Specification for Elastomeric Joint Sealants

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Overview
Scope, Applications, and Benefits
Test Process
Specifications
Instrumentation
Results and Deliverables

Overview

ASTM C920-18 defines the requirements and classification for elastomeric joint sealants used in construction and engineering applications. These sealants are designed to accommodate movement, provide weather resistance, and maintain durable sealing performance under varying environmental conditions.

The standard classifies sealants based on movement capability, application type, and performance characteristics. It ensures that sealants meet minimum quality and durability requirements, supporting long-term performance in joints exposed to thermal expansion, moisture, and mechanical stress.

Scope, Applications, and Benefits

Scope

ASTM C920-18 specifies performance requirements, classification, and testing criteria for elastomeric joint sealants used in sealing joints subjected to movement and environmental exposure.

Covers single and multi-component elastomeric sealants
Classifies sealants by movement capability and application type
Includes requirements for adhesion, cohesion, and durability
Applicable to building joints, glazing, and structural sealing
Supports both laboratory testing and field applications

Applications

Building expansion and control joints
Glazing and curtain wall sealing
Precast concrete joints
Masonry and façade sealing
Industrial and infrastructure sealing applications

Benefits

Ensures reliable joint sealing performance
Accommodates structural movement effectively
Enhances weather and moisture resistance
Improves durability and service life
Supports compliance with industry standards

Test Process

Sample Preparation

Sealant specimens are prepared and conditioned according to specified dimensions and curing conditions.

Application and Curing

Sealant is applied to substrates and allowed to cure under controlled environmental conditions.

Performance Testing

Samples are subjected to adhesion, cohesion, and movement capability tests as per standard requirements.

Evaluation and Classification

Results are analyzed to classify sealant based on movement, durability, and performance characteristics.

Technical Specifications

Parameter	Details
Material Type	Elastomeric sealants (silicone, polyurethane, etc.)
Classification	Type, Grade, Class, and Use
Movement Capability	Typically ±12.5% to ±50%
Application Mode	Single-component or multi-component
Adhesion Requirement	Strong bond to specified substrates
Durability	Resistance to weathering and aging
Test Conditions	Controlled laboratory environments
Cure Mechanism	Moisture cure or chemical cure

Instrumentation Used for Testing

Universal testing machine
Environmental chamber
Adhesion test apparatus
Tensile testing equipment
Curing ovens
Measurement gauges
Substrate preparation tools

Results and Deliverables

Sealant classification (Type, Grade, Class, Use)
Performance test results (adhesion, cohesion, movement)
Compliance report as per ASTM C920-18
Observations on material behavior
Recommendations for application suitability

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Frequently Asked Questions

ASTM C920-18 specifies performance requirements and classification for elastomeric joint sealants used in construction. It ensures sealants provide durability, flexibility, and resistance to environmental conditions, helping maintain effective sealing in joints exposed to movement, weather, and mechanical stress over time.

One-component elastomeric sealant (Type S) and multicomponent elastomeric sealants (Type M), respectively, each of which has different grades for non-sag (Grade NS) and pourable (Grade P) applications.

These sealants are typically used to seal joints in building facades, window frames, highways, bridges, and industrial facilities against the intrusion of water, air, and other contaminants that may cause damage.

It means the capability of movement regarding the sealant's ability to stretch and compress with the joint without losing any sealing effectiveness. It is very important in applications where joints are subject to considerable movement.

Elastomeric joint sealants are flexible materials used to seal joints and gaps in structures. They can stretch and recover, allowing them to accommodate movement caused by temperature changes, structural shifts, or vibrations without losing sealing performance.