Micom Laboratories is pleased to announce that it now offers the ASTM D5420, ASTM D4226 and ASTM D2794 tests as part of its offering for polymer testing and coating testing. Although these three methods are for different materials, they are essentially the same test method and can be interchanged in a transparent way.
In terms of definitions, an impact is a high force or shock applied over a short time period when two or more objects strike each other, it is proportionate to the relative velocity of the colliding materials. The purpose of impact testing is to study the ability of a material to absorb energy upon a collision. This energy is a factor of the toughness, impact strength, fracture resistance or impact resistance of the material. As impact takes place, the stress concentration exceeds the strength of the polymer. Failure then occurs in the form of cracks. The impact resistance properties are crucial in the selection of materials for specific applications and these three test methods are useful in the determination of the impact mechanical properties of the test specimens.
Upon testing, the specimens are placed on a holding fixture with the geometry determined by the type of test and the specific material. A known weight falls through a guiding system and impacts a striker sitting on top of an anvil supported specimen. The weight is dropped from various heights until failure occurs. Following the collision, an instantaneous transfer of energy occurs between the hemispheric striker and the specimen. There are different impactor geometries, each ones having different diameter.
Nearly all materials my benefit from impact testing since impact resistance governs the life durability of materials such as those used for protecting workers. Furthermore, quantifying the impact resistance is a great advantage in product liability and safety. It is however important to keep in mind that the impact resistance of materials depends on the temperature and other environmental conditions.
Micom offers polymer testing services for a wide selection of material and products. For more information about the ASTM D2794, ASTM D4226 and ASTM D5420 tests, do not hesitate to get in touch with our specialists.
Micom Laboratories is a third party industrial material testing laboratory accredited by the Standards Council of Canada, CGSB, ISTA and many other organizations.
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