{"id":6774,"date":"2025-07-11T11:04:32","date_gmt":"2025-07-11T03:04:32","guid":{"rendered":"https:\/\/www.qualitester.com\/?page_id=6774"},"modified":"2025-07-11T11:04:46","modified_gmt":"2025-07-11T03:04:46","slug":"film-pendulum-impact-testing","status":"publish","type":"page","link":"https:\/\/www.qualitester.com\/sk\/applications\/film-pendulum-impact-testing\/","title":{"rendered":"Film Pendulum Impact Testing Method"},"content":{"rendered":"

Film Pendulum Impact Testing Method
\nASTM D3420<\/small><\/h1>\n
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Str\u00e1nka ASTM D3420<\/strong> standard is a widely recognized test method for evaluating the impact resistance of plastic film<\/em> using a pendulum-style apparatus. For industries like packaging, medical devices, food, pharmaceuticals, and electronics<\/strong>, this test is critical to ensure that films can withstand dynamic mechanical stress during handling, shipping, or application.<\/p>\n

This article outlines the principles of ASTM D3420, its relevance, procedures, and how Mobiln\u00e9 n\u00e1stroje<\/a>\u2019 PIT 01 Pendulum Impact Tester<\/strong> provides reliable and repeatable results in compliance with the standard.<\/p>\n

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ASTM Standards for Impact Testing of Plastics<\/h2>\n

Plastic films are subject to diverse mechanical stresses depending on their application. To evaluate their durability<\/strong>, ASTM has developed several standardized methods. Among them, ASTM D3420<\/strong> specifically measures dynamic toughness<\/strong>, providing data closer to real-use conditions than static tensile tests.<\/p>\n

Str\u00e1nka Spencer Impact Test<\/strong>, originally developed as Procedure B within ASTM D3420, uses a smaller-diameter impact head and a larger clamping aperture. It remains a widely adopted variation due to its ability to replicate common packaging failures.<\/p>\n

Other standards like ASTM D1709<\/strong> a ASTM D4272<\/strong> also assess impact performance, but ASTM D3420\u2019s pendulum method<\/strong> stands out by delivering repeatable energy-to-break data<\/strong> across different film types and thicknesses.<\/p>\n

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Film Pendulum Impact Testing Method<\/h2>\n

In the ASTM D3420 method, a specimen is clamped between two rigid plates, each with a defined aperture. A hemispherical pendulum head is released from a known height, impacting and rupturing the center of the film.<\/p>\n

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    Procedure A<\/strong> uses a 60 mm aperture and a 25.4 mm diameter impact head.<\/p>\n<\/li>\n

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    Procedure B (Spencer Impact Test)<\/strong> employs an 89 mm aperture with a 19.0 mm impact head.<\/p>\n<\/li>\n<\/ul>\n

    Str\u00e1nka energy absorbed by the film<\/strong> during rupture is read on a calibrated analog or digital scale and recorded in Joules<\/strong> alebo cm\u00b7kgf<\/strong>. No correction is made for energy absorbed by fragments, as the effect is minimal.<\/p>\n

    This test is especially relevant for packaging engineers<\/strong>, quality control labs<\/strong>a film manufacturers<\/strong> who need reliable, real-world toughness data for thin films used in flexible packaging, barrier films, or sealing layers.<\/p>\n