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Accurate and consistent tear testing is essential for maintaining product quality, meeting compliance requirements, and ensuring end-user satisfaction.
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Step-by-step test methodology
Preparation
Sample selection - Choose representative specimens, avoiding faults unless deliberately testing them.
Specimen cutting - Cut to standard dimensions with a central slit of specified
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How to conduct a grab test
A standard grab test involves the following steps:
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What is fastening torque
Fastening torque refers to the rotational force applied to tighten a fastener, typically measured in Newton-metres (N·m) or pound-force inches (lbf·in). The correct torque value ensures adequate clamping without overstressing components.
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Introduction to torque testing
Torque testing is a vital part of packaging quality control.
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Interpreting test results
Peel strength is typically reported in newtons per metre (N/m) or per 25 mm of bond width (N/25mm), depending on the industry standard. From the force-displacement graph, the following characteristics are analysed:
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Standards for the peel wheel test
Standardisation ensures peel wheel tests are consistent and repeatable across laboratories and production sites.
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Understanding and interpreting test results
Box crush testing provides clear, measurable data to inform design and compliance decisions:
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Selecting the right approach to secant modulus testing depends on the material, applicable standards, and the intended use of the results.
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Measurement and testing methods
Techniques for measuring tangent modulus
Tangent modulus is measured during tensile or compression testing, w
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Introduction
ISO 11040-4 Annex F outlines the standardized method for testing the mechanical properties of pre-filled syringes, specifically focusing on needle penetration and drag.
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Methods and applications
Common test methods
Most single lap shear tests are carried out under tensile loading, but the method can vary depending on material type, bond configuration and industry require
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Mecmesin equipment for tension and compression testing
Mecmesin offers a range of systems for static and cyclic testing, including:
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Modulus of elasticity formula
Young’s modulus (E) is calculated from the linear portion of a stress-strain curve using this formula:
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Introduction to compressive shear testing
Compressive shear testing is a mechanical test method used to measure a material’s ability to resist shear forces while under compressive load.
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Applications of peel testing
Packaging: Testing seal strength in pouches, blister packs, and easy-open systems.
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Shear modulus equation
Shear modulus (G) and Young’s modulus (E) are both measures of a material’s stiffness - but under different types of loading.
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Standards for trapezoidal tear testing
Several international standards define this method, specifying specimen dimensions, slit length, and test speed. The most widely used include:
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For engineers looking to define robust torque to turn test protocols or specify equipment, Mecmesin’s applications engineering team offers specialist guidance.
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Applications across industries
Friction testing plays a vital role in multiple sectors:
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For specialist advice on four-point bend testing—including test setup, standard compliance, and equipment selection—contact Mecmesin’s technical support team.
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For expert guidance on fastening torque testing, Mecmesin’s technical specialists can help you select the right tester, develop compliant test methods, and optimise fixture design for you