ISO 24068-1-2021 PDF

Full title and description

ISO 24068-1:2021 — Building and civil engineering sealants — Determination of the degree of cure — Part 1: Build-up of tensile properties in dumbbell-shaped specimens. This International Standard specifies a laboratory method to track the development of tensile properties in dumbbell-shaped specimens as a way to determine the degree of cure of one- and multi-component construction sealants during their curing process.

Abstract

This document specifies a method for the determination of the degree of cure of one- and multi-component sealants as indicated by the build-up of the tensile properties in dumbbell-shaped specimens during cure. The method provides a repeatable procedure for specimen preparation, conditioning and tensile testing to produce build-up curves of tensile parameters that indicate progression toward full cure.

General information

• Status: Published (active).
• Publication date: 3 May 2021 (published May 2021).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 91.100.50 (Binders; Sealing materials).
• Edition / version: Edition 1 (2021).
• Number of pages: 6 pages.

All items above taken from the ISO bibliographic record for ISO 24068-1:2021.

Scope

Applies to the laboratory determination of the degree of cure of one- and multi-component building and civil engineering sealants by measuring the progressive increase (build-up) of tensile properties in standardized dumbbell-shaped specimens during cure. It is intended for use in product development, process control and comparative evaluation of curing behaviour rather than as a direct prediction of in-service lifetime. The method defines specimen form, conditioning, testing intervals and reporting necessary to produce comparable build-up data.

Key topics and requirements

• Specimen geometry: preparation of dumbbell-shaped specimens appropriate for tensile testing.
• Conditioning and cure schedule: controlled environmental conditions and timed test points to monitor curing progress.
• Tensile testing procedure: method for measuring tensile strength, elongation and relevant modulus parameters at successive cure times.
• Build-up data analysis: generation and interpretation of tensile-property vs. time curves to indicate degree of cure.
• Reporting: required test metadata, specimen descriptions, test conditions and presentation of build-up results for reproducibility and comparison.
• Applicability notes: intended for laboratory evaluation of cure progress; users should consider complementary adhesion or joint tests for in-service performance assessment.

Typical use and users

Used by sealant manufacturers (R&D and QC laboratories), independent testing and certification bodies, materials scientists studying polymer cure kinetics, façade and building-envelope engineers involved in specification and verification, and regulators or procurement authorities requiring quantified evidence of curing behaviour for sealant systems. Typical applications include product development, batch quality control, comparative screening of formulations and supporting technical data for specifications and approvals.

Related standards

Relevant related standards and documents include ISO 24068-2:2021 (Determination of the degree of cure — Build-up of tensile and adhesion properties in test joint specimens), which extends cure assessment to joint specimens; ISO 23658:2020 (bead peel test for adhesion of sealants) for adhesion testing methods; and ISO 8339 (tensile properties of sealants) which defines tensile-property test methods commonly used in sealant testing and classification. These documents are complementary and often used together when evaluating sealant performance.

Keywords

sealants, degree of cure, cure kinetics, tensile build-up, dumbbell specimen, sealant testing, building sealants, civil engineering sealants, ISO 24068

FAQ

Q: What is this standard?

A: ISO 24068-1:2021 is an ISO test method standard that specifies how to determine the degree of cure of one‑ and multi‑component building and civil engineering sealants by monitoring the build-up of tensile properties in dumbbell-shaped specimens.

Q: What does it cover?

A: It covers specimen preparation, conditioning, scheduled tensile testing and reporting to produce build-up curves of tensile parameters (strength, elongation, modulus) as indicators of cure progression. It is intended for laboratory evaluation of curing behaviour rather than direct prediction of long-term in-service performance.

Q: Who typically uses it?

A: Sealant manufacturers (R&D and QC), independent test laboratories, material scientists, façade and building‑envelope engineers, and conformity assessment bodies use the standard for product development, quality control and comparative testing.

Q: Is it current or superseded?

A: ISO 24068-1:2021 was published in May 2021 and is listed as a published International Standard. Users should check their national standards body or ISO for any subsequent revisions or confirmations, but as issued it is the current first edition (published 3 May 2021).

Q: Is it part of a series?

A: Yes — it is Part 1 of ISO 24068. Part 2 (ISO 24068-2:2021) covers build-up of tensile and adhesion properties in test joint specimens; the two parts are complementary for comprehensive cure and performance assessment.

Q: What are the key keywords?

A: Degree of cure, sealant curing, tensile properties, dumbbell specimen, sealant testing, build-up curve, ISO 24068.