ASTM C719-22 PDF

Full title and description

ASTM C719-22 — Standard Test Method for Adhesion and Cohesion of Elastomeric Joint Sealants Under Cyclic Movement (Hockman Cycle). This laboratory test method (the Hockman cycle) evaluates adhesion and cohesion performance of elastomeric joint sealants subjected to water immersion, temperature change and cyclic extension/compression movements to classify movement capability and identify adhesive or cohesive failure modes.

Abstract

This standard specifies an accelerated test sequence for building sealants that subjects standard joint specimens to sequential treatments — water immersion, oven exposure under compression, automated cyclic extension/compression at ambient and alternating high/low temperatures — and uses visual inspection to assess adhesive and cohesive failures, deformation and internal bubbling. Results are used to determine sealant suitability for specified cyclic movement classes.

General information

• Status: Active.
• Publication date: 1 February 2022 (edition 2022).
• Publisher: ASTM International.
• ICS / categories: 91.100.50 (Binders. Sealing materials).
• Edition / version: ASTM C719-22 (2022 edition).
• Number of pages: 8 pages.

Key bibliographic details above are taken from the ASTM document summary and major standards repositories.

Scope

This test method is an accelerated laboratory procedure intended to evaluate the performance of a building sealant installed in a standard test joint subjected to (a) immersion in water, (b) oven exposure while compressed, (c) automated cyclic compression/extension at room temperature, and (d) alternate compression and extension at elevated and reduced temperatures. It is applicable to any joint movement and is used to classify cyclic movement capability and to reveal adhesive or cohesive failure modes; it does not address failures caused by improper joint design or application practices.

Key topics and requirements

• Definition and execution of the Hockman cycle: sequence of water immersion, oven compression, room-temperature cycling, and high/low temperature alternate cycling.
• Evaluation criteria: visual inspection for cohesive failure within the sealant, adhesive failure at the substrate interface, sealant deformation and entrained bubbles.
• Cyclic movement classes and test amplitudes: the standard provides movement-class definitions (examples commonly used in industry include ±12.5%, ±25% and higher classes) and corresponding extension/compression dimensions in Table 1.
• Units and conversions: inch–pound units are standard; SI conversions are provided for information only.
• Applicability notes: assesses properly installed sealants (with recommended primers) and does not substitute for evaluation of design, installation quality or field conditions.

These elements summarize the principal test procedures and reporting requirements specified by the standard.

Typical use and users

Used by sealant manufacturers (R&D and QC), independent testing laboratories, product certifiers, architects and façade/building-envelope consultants, and specification writers to verify movement capability and adhesion/cohesion performance of elastomeric joint sealants and to support product data sheets, technical submittals and compliance with specifications such as ASTM C920. Test reports inform material selection for expansion, control and façade joints.

Related standards

Commonly used together with ASTM C920 (Specification for Elastomeric Joint Sealants), ASTM C794 (Adhesion-in-Peel), ASTM C661 (Shore A hardness), ASTM C793 (laboratory accelerated weathering), ASTM C1135 (tensile properties), and other sealant test methods that define mechanical and durability properties.

Keywords

Hockman cycle, cyclic movement, adhesion, cohesion, elastomeric joint sealant, movement class, sealant testing, ASTM C719-22, building envelope, test method.

FAQ

Q: What is this standard?

A: ASTM C719-22 is a standard test method that defines the Hockman cycle for assessing adhesion and cohesion of elastomeric joint sealants under cyclic movement and environmental conditioning.

Q: What does it cover?

A: It covers an accelerated laboratory sequence (water immersion, oven compression, cyclic extension/compression at ambient and alternating temperatures), criteria for inspecting adhesive and cohesive failures, and classification of sealant movement capability. It is not a specification for acceptable field installation.

Q: Who typically uses it?

A: Sealant manufacturers, independent testing laboratories, façade consultants, architects, specifiers and product certifiers use C719 to verify movement capability and adhesion/cohesion performance for product development, quality control and specification compliance.

Q: Is it current or superseded?

A: Current — the 2022 edition (ASTM C719-22) is the latest active edition and supersedes the prior 2014/2019 revision series. Users should confirm edition requirements in project specifications.

Q: Is it part of a series?

A: C719 is one of several complementary ASTM test methods and specifications for sealants (for example C920, C794, C661, C793, C1135) that together inform sealant classification and performance characterization.

Q: What are the key keywords?

A: Hockman cycle; cyclic movement; adhesion; cohesion; elastomeric sealant; movement class; ASTM C719-22.