ASTM D5034-21 (2025) PDF

Full title and description

ASTM D5034-21(2025) — Standard Test Method for Breaking Strength and Elongation of Textile Fabrics (Grab Test). Specifies grab and modified-grab tensile test procedures to determine the breaking strength and elongation of most woven, nonwoven and felted textile fabrics; includes provisions for wet testing and both inch‑pound and SI units.

Abstract

This standard defines the grab and modified grab methods used to evaluate the maximum breaking force and elongation at break for textile fabrics under controlled conditions. The grab test clamps only a portion of the specimen width to better simulate real-world stresses (for example seam pull or snagging). The method includes specimen preparation, conditioning, test speeds, gauge lengths, reporting conventions and limitations on applicability (for example it is not recommended for glass fabrics or highly stretchable knits).

General information

• Status: Active (current edition designated D5034-21 with ASTM parenthetical reference D5034-21(2025)).
• Publication date: Original issue: February 15, 2021; current designation / implementation noted June 1, 2025 (ASTM D5034-21(2025)); last active update recorded July 8, 2025.
• Publisher: ASTM International (American Society for Testing and Materials).
• ICS / categories: 59.080 — Products of the textile industry; specifically 59.080.30 — Textile fabrics.
• Edition / version: D5034-21 (reaffirmed/issued with parenthetical year 2025 → cited as D5034-21(2025)).
• Number of pages: 9 pages.

Scope

Provides standardized procedures for the grab and modified grab tests to determine breaking strength and elongation of most textile fabrics. The grab test is intended for woven, nonwoven and felted fabrics; the modified grab is primarily for woven or high‑strength fabrics where fraying must be limited. The standard describes specimen sizes and markings, conditioning requirements, test speeds, jaw/grip configurations and acceptance/rejection criteria. It explicitly excludes or advises against use for glass fabrics and highly stretchable knitted fabrics (generally >11% stretch).

Key topics and requirements

• Specimen dimensions and marking: typical specimen width 4 in (100 mm) with a recommended length (minimum 6 in / 150 mm) and specified marking distance from the edge (about 37 ±1 mm) for proper grip placement.
• Grab vs. modified grab: definitions and when to use each method; modified grab includes side cuts to isolate the central gripping zone for high‑strength/fraying fabrics.
• Gauge length and grip details: typical grip‑to‑grip separation and recommended grip face dimensions for front and rear grips to minimise slippage and damage.
• Test speed: standard crosshead speed used for the procedure (commonly 12 in/min or 300 mm/min) unless otherwise specified.
• Conditioning and environment: specimen conditioning (temperature and relative humidity) and handling prior to testing (referencing textile conditioning practice requirements).
• Measurement and reporting: breaking force (lbf or N), elongation at break (%), number of specimens per direction and rules for discarding invalid breaks (for example breaks within a short distance of grips).
• Limitations and applicability: not recommended for glass fabrics or highly elastic knits; alternative methods (for example ravelled strip or cut strip tests) are referenced where appropriate.
• Wet testing provisions: instructions for testing after wetting when required by the purchaser or specification.

Typical use and users

Used by textile test laboratories, quality control departments, fabric and apparel manufacturers, suppliers and purchasers for acceptance testing, product development and comparative performance evaluation. Typical users include apparel and home‑textile manufacturers, nonwoven producers, research laboratories, standards bodies and third‑party test houses verifying tensile performance and reporting breaking strength and elongation data for specifications, contracts and compliance.

Related standards

Commonly referenced or complementary standards include ASTM D5035 (raveled and cut strip tensile methods), ISO 13934-2 (grab test — internationally aligned procedure), ASTM D1776 (conditioning of textile specimens), and other ASTM textile test methods for tearing, seam strength and related physical properties.

Keywords

grab test, modified grab, tensile strength, breaking strength, elongation, textile fabrics, woven, nonwoven, specimen conditioning, ASTM D5034-21, D5034-21(2025)

FAQ

Q: What is this standard?

A: ASTM D5034-21(2025) is the ASTM test method that specifies the grab and modified grab procedures for measuring breaking strength and elongation of most textile fabrics.

Q: What does it cover?

A: It covers specimen preparation, conditioning, test machine and grip requirements, test speed and gauge length, data reporting (breaking force and elongation), applicability limits and procedures for wet testing. It gives detailed instructions to obtain reproducible tensile results using the grab approach.

Q: Who typically uses it?

A: Textile testing laboratories, QA/QC teams in textile and apparel manufacturing, suppliers and purchasers, standards developers and third‑party certification or testing bodies use this standard for acceptance testing and performance verification.

Q: Is it current or superseded?

A: The designation D5034-21 indicates the 2021 revision; it is carried with the parenthetical year 2025 (D5034-21(2025)) indicating the current ASTM designation/affirmation as of 2025. Status: active (current edition).

Q: Is it part of a series?

A: It is related to a family of textile mechanical property tests. A closely associated ASTM method is D5035 (strip tests for breaking force and elongation). ISO 13934-2 is the international grab test that aligns closely with ASTM D5034.

Q: What are the key keywords?

A: Grab test, modified grab, breaking strength, elongation, textile fabrics, tensile testing, specimen conditioning, ASTM D5034.