DIN EN 28340 1991-05 PDF

Full title and description

DIN EN 28340:1991-05 — Building construction; jointing products; sealants — Determination of tensile properties at maintained extension. This entry is the German adoption (DIN) of EN 28340:1990, which implements the ISO 8340 test method for measuring tensile behaviour of sealants under a maintained extension.

Abstract

This standard specifies a laboratory test method for determining tensile properties of sealants used in building joints when held at a fixed extension. The sealant specimen is bonded between two parallel contact surfaces, stretched to a defined displacement and held; any cohesive or adhesive failure is observed and recorded. The method is intended to characterise sealant performance under sustained deformation rather than under monotonic tensile loading.

General information

• Status: Withdrawn / superseded.
• Publication date: May 1, 1991 (1991-05).
• Publisher: Deutsches Institut für Normung (DIN) — German version of EN 28340:1990.
• ICS / categories: 91.100.50 (Binders; sealing materials / sealants).
• Edition / version: German adoption of EN 28340:1990; published as DIN EN 28340:1991-05.
• Number of pages: 5 (national adoption document length may vary by publisher).

Scope

Covers a standardised procedure to determine tensile (deformation) behaviour of joint sealants when held at a maintained extension. The method records whether failure occurs by loss of adhesion to the substrate or by cohesive rupture of the sealant, under defined specimen geometry and conditioning. It is applicable to sealants used in building construction joints and is equivalent to ISO 8340:1984 / EN 28340:1990 in its test intent.

Key topics and requirements

• Test specimen preparation: sealant bonded between two parallel contact surfaces of prepared specimens.
• Application of a defined extension (displacement) to the specimen and maintenance of that extension for a specified period.
• Recording of tensile response and observation of failure mode (adhesive vs cohesive failure).
• Specified conditioning and test-environment requirements (temperature/humidity) and defined specimen dimensions.
• Reporting requirements: test geometry, conditioning, time held at extension, observed failures and measured values.

Typical use and users

Used by product testing laboratories, sealant and adhesive manufacturers, certification bodies, construction product specifiers and R&D teams to characterise and compare tensile behaviour of sealants under sustained deformation. Useful for product development, performance claims, quality control and regulatory/contractual testing of jointing products.

Related standards

ISO 8340 (original international method, 1984; revised 2005), EN 28340:1990 (CEN version), DIN EN ISO 8340:2005 (later German/ISO consolidated edition that superseded DIN EN 28340). This DIN document replaced earlier national standards (for example it replaced DIN 52455-2:1987-07) and was later replaced by the ISO-consolidated edition.

Keywords

sealants, jointing products, tensile properties, maintained extension, adhesion, cohesion, building construction, EN 28340, ISO 8340, DIN

FAQ

Q: What is this standard?

A: DIN EN 28340:1991-05 is the German-adopted version of EN 28340:1990, specifying a laboratory test method for determining tensile properties of sealants held at a maintained extension (based on ISO 8340:1984).

Q: What does it cover?

A: It provides the procedure for preparing specimens, applying a defined extension that is then maintained, and recording whether sealant failure is adhesive or cohesive and the tensile response under those conditions.

Q: Who typically uses it?

A: Materials test laboratories, sealant manufacturers, product certifiers, architects and specifiers, and R&D teams concerned with sealant performance in building joints.

Q: Is it current or superseded?

A: Superseded/withdrawn. DIN EN 28340:1991-05 has been withdrawn and the method was consolidated into the later DIN EN ISO 8340 (ISO 8340:2005 / DIN EN ISO 8340:2005), which is the current consolidated edition of the test method.

Q: Is it part of a series?

A: It is one of a set of standards and test methods addressing jointing products and sealants under CEN/ISO work on building sealants; the ISO technical committee responsible is ISO/TC 59/SC 8 (sealants/jointing products). Related standards cover other mechanical and durability tests for sealants and jointing materials.

Q: What are the key keywords?

A: Sealants, jointing products, tensile test, maintained extension, adhesion, cohesion, building construction, EN 28340, ISO 8340.