ASTM D (D ) covers multiple properties of O-Rings. Part of the specification includes tension testing for determining the breaking. AMS and MIL-R Type 1 Class 1 Typical Values. Hardness, Shore A, ASTM D 90 ±5. Tensile Strength, psi, ASTM D min. ASTM D Standard Test Methods for Rubber O-Rings.
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Designed for testing elastomeric materials in the form of rings, these fixtures avoid local stress concentrations by using a lower spindle that is rotated by a toothed belt wstm from the moving crosshead. Subscribe to Instron News! Our Series or Series universal testing systems can easily be used to perform the tests laid out within this standard.
Elongation and tensile strength are the two main calculations. The fixture can use interchangeable rollers at different sizes.
Email addresses must contain the symbol. Cracking, flaking, general brittleness, and other characteristics can appear in the rubber O-rings when they are exposed to temperature cycles and solar radiation.
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ASTM D Rubber O-Rings – Instron
Glossary of Materials Testing Terms. Top top grip has a counterweight to allow for even loading. If your O-ring specimens fall within the allowed awtm, they can be tested with a static fixture.
They are designed with standard and optional features that increase testing efficiency and improve the testing experience for the operator. Bluehill LE for Basic Testing. The fixture ships complete with a power adapter for both US and International power outlets.
ASTM D1414 Rubber O-Rings
Pre-canned test methods are also available for both o-ring and straight specimens to make setup time faster and easier. These specimens can be tested as whole rings or as straight, cylindrical specimens. ASTM D specifies the procedures for determining the physical properties of o-rings. It is important to review ASTM D in order to fully understand the test aetm, procedure, and results requirements.
Static rubber rings are used d414 gas sealing and specialized applications including vacuums. It is recommended that groups of samples are tested and the data is compared using a method similar to Statistical Process Control.
The upper spindle rotates freely and f1414 rotation frequency of the lower spindle is easily selected by moving the toothed belt from one pulley to another. Our Series Elastomeric “O” Ring Test Fixtures were designed to accurately meet the requirements, and conveniently avoid the need for lubricants or external power motors. Next Checking to see if you are a returning visitor….
The standard sizes that Universal Grip carries are 3.
This simple circular elastomer design is interesting since O-rings are used in so many sealing applications. The versatility of an O-ring allows it asm function in multiple modalities. Secure gripping – When testing straight specimens or single strands, pneumatic side action grips with serrated or rubber coated faces are the preferred gripping configuration.
How can we help you? Rings under tension in high temperature environments can experience something called the Gough-Joule effect where they tend to contract in this scenario. Rubber bands are also commonly tested under this standard to test their tensile strength and elongation characteristics. Fixture – The standard specifies a fixture consisting of two spools to hold an o-ring while under test. Consideration needs to be made for d141 fixture geometry spool separation and diameter as well as specimen geometry.
The challenges of testing to this standard: The rotation keeps localized stress moments on the sample to a minimum.
Specimen gripping Specimen slippage Calculations Our solutions: Subscribe to Our Newsletters. In some cases, a special type of oil may be used to alleviate friction between the ID of the O-ring and the grip surface. These materials tend to elongate v1414 so attention must be made to the total stroke of the tensile tester.
Some advanced calculations including elongation modulus can also be derived from the data.