ASTM D1621 Compressive Properties Rigid Cellular Plastics
This part of ASTM D1621-04a specifies the test conditions for determining the compressive properties of rigid cellular materials, particularly expanded plastics. Rigid foams are typically used in the construction industry as sound and thermal insulation. Calculations referenced in this standard include yield points, compressive strength, and compressive modulus.
Suitable systems for this application include 3300 and 5900 series electromechical testing machines equipped with compression platens. The parallelism of the compression platens is important and it is recommended that a spherical seating style compression platen is utilized along with a rigid platen. The self-aligning nature of this fixture will maximize the contact area between the platen and the specimen. Swivel seating can be placed on the platen attached to the instrument's base or load cell in the moving crosshead. To reduce the possible affects from off-center loading, it is preferred to place the swivel seat in the base.
When two rigid compression platens are used, it is recommended that a strain gauge device, such as a linear variable displacement transformer (LVDT), is used to minimize error due to compliance from the system. However, if you are using Bluehill® Software, which incorporates a load frame compliance correction calculation, a deflectometer is not required unless stated so in testing standard.
To make the testing easier, leave a 10 to 30 mm gap between the specimens that allows you to quickly and easily remove the tested specimens and position new ones. The Bluehill preload function automatically moves the upper compression platen down to precisely touch the specimen at a pre-defined load. The preload function reduces the amount of operator interaction, saving time and improving accuracy.
Bluehill 2 material testing software is the second generation of the original fully-integrated modular software package that provides easy tailored application solutions for today's laboratory managers and test technicians. In addition to the standard testing applications including tensile, compression, flexural, peel, tear and friction, Bluehill 2 has several new and unique added features.
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5900 Universal Testing Systems are engineered for precision, built for durability, and offer the flexibility for changing requirements. They are designed with standard and optional features that increase testing efficiency and improve the testing experience for the operator. A wide range of models are available for testing capacities from < 100N up to 600kN.
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The 2601 series Linear Variable Differential Transformer (LVDT) displacement transducers are measuring devices that measure the displacement of the load frames of materials testing systems. They feature an LVDT as the active element, and are designed for use on both electromechanical and hydraulic Instron® testing systems.
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The Plastics Testing Solutions brochure is a 40-page, applications-focused, and standards-based brochure. Important standards such as ISO 527-1, -2, -3, ISO 11443, ISO 75, ASTM D638, Astm D3835, are covered in a detailed testing challenge and solution format. The brochure addresses the most prominent and widely-used standards in the materials testing industry for plastics. Test types such as Impact, Rheology, Thermo-Mechanical, Specimen Preparation, Mechanical Testing, Dynamic/fatigue, and Hardness are described in great detail.
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