{"id":9847,"date":"2026-02-24T15:11:45","date_gmt":"2026-02-24T07:11:45","guid":{"rendered":"https:\/\/www.packqc.com\/standard\/iso-9895\/"},"modified":"2026-04-16T09:54:22","modified_gmt":"2026-04-16T01:54:22","slug":"iso-9895","status":"publish","type":"standard","link":"https:\/\/www.packqc.com\/nn\/standard\/iso-9895\/","title":{"rendered":"ISO 9895"},"content":{"rendered":"

Understanding the SCT Test and Its Industrial Importance<\/h2>\n\n\n\n

The SCT test<\/strong>, or short-span compression test, is essential for evaluating the in-plane compressive strength of paper and board materials. It simulates the stresses encountered during stacking, loading, and packaging applications\u2014particularly in corrugated board manufacturing.<\/p>\n\n\n\n

The ISO 9895 method uses a short span compression tester<\/strong> to clamp a 15 mm wide test strip with a span of only 0.7 mm between the jaws. The clamps then compress the specimen until it buckles or fails, measuring the maximum force<\/strong> applied. This value is used to compute compressive strength in kilonewtons per meter (kN\/m), providing critical information for boxboard producers and packaging engineers.<\/p>\n\n\n\n

This test is especially suitable for papers with a grammage range of 100 to 400 g\/m\u00b2<\/strong>, commonly found in containerboard, kraft liner, and fluting<\/strong> applications. Manufacturers often prefer the SCT test over other methods due to its low span and strong correlation to box compression strength (BCT).<\/p>\n\n\n\n

Key Parameters in ISO 9895 Testing<\/h2>\n\n\n\n

ISO 9895 outlines strict test conditions and apparatus requirements to ensure consistency and accuracy:<\/p>\n\n\n\n

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  • Clamp width<\/strong>: 30 mm<\/li>\n\n\n\n
  • Clamping force<\/strong>: 2,300 \u00b1 500 N<\/li>\n\n\n\n
  • Span between clamps<\/strong>: 0.70 mm \u00b1 0.05 mm<\/li>\n\n\n\n
  • Compression speed<\/strong>: 3 mm\/min \u00b1 1 mm\/min<\/li>\n\n\n\n
  • Precision<\/strong>: \u00b11% error within 10\u2013100% of the full-scale range<\/li>\n<\/ul>\n\n\n\n

    Measurement accuracy and consistent sample preparation are critical. Conditioning according to ISO 187<\/strong> and grammage determination per ISO 536<\/strong> are required before testing.<\/p>\n\n\n\n

    Advantages of the Short Span Compression Tester in Paper Testing<\/h2>\n\n\n\n

    Utilizing a short span compression tester<\/strong> brings multiple benefits:<\/p>\n\n\n\n

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    • Quick and accurate testing<\/strong> with minimal specimen preparation<\/li>\n\n\n\n
    • Strong correlation to end-use performance<\/strong>, especially in corrugated and folded boxes<\/li>\n\n\n\n
    • High repeatability and reproducibility<\/strong>, essential for QA\/QC operations<\/li>\n\n\n\n
    • Sensitive detection<\/strong> of subtle differences in machine direction (MD) and cross direction (CD) strength properties<\/li>\n<\/ul>\n\n\n\n

      The Cell Instruments SCT-01 Short Span Compression Tester<\/strong> is engineered to fully comply with ISO 9895 and includes precision clamping mechanics, stable jaw alignment, and an intelligent control interface to ensure repeatable<\/strong> and standardized SCT test<\/strong> results.<\/p>\n\n\n\n

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