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GBT1683 Vulcanized Rubber Compression Set Test

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Vulcanized Rubber Compression Deformation Apparatus

1. The compression plates consist of a pair of parallel, flat, high-gloss steel plates, with the specimen compressed between them. The surface roughness Ra of the compression plates should not exceed 1.6 µm.
1. The compression plate should have: sufficient rigidity to ensure it does not deform under pressure, for which steel plates are recommended; and a sufficiently large size to guarantee that, when the specimen is compressed between the two plates, the entire sample remains fully contained within the plate area.
2. The limiter provides the corresponding compression ratio.
3. The shape and dimensions of the restrictor should ensure it does not come into contact with the compressed specimen. The recommended heights for the restrictor are (8 ± 0.02) mm, (7 + 0.02) mm, or (6 ± 0.02) mm; the selected restrictor height must meet the requirements for the specimen's compression ratio.
4. Fasteners are screw devices composed of bolts and nuts.
6. Dimensions: The specimen is a cylinder with a diameter of (10 ± 0.2) mm and a height of (10 ± 0.2) mm. The height difference among specimens in the same group must not exceed 0.05 mm.

7. Sample Preparation: The sample should be directly vulcanized using a mold, ensuring its surface is smooth and perpendicular or parallel to each other. The sample must be free of bubbles, impurities, or any damage. Alternatively, the sample can also be cut from a vulcanized rubber sheet meeting the thickness requirements specified in 5.1 using a circular cutter with an inner diameter of (10.2 ± 0.02) mm. During the cutting process, the cutter edge may be lubricated with neutral soap solution, and the blade should be advanced slowly to minimize tapering of the diameter.

Samples prepared using the different methods mentioned above may yield varying test results, making the results incomparable.

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Hebei Yinfeng Experimental Instrument Co., Ltd. is a high-tech enterprise dedicated to the research and development, production, and sales of experimental instruments. The company is headquartered in Hebei Province, relying on the strong industrial foundation and technological innovation resources in the Beijing Tianjin Hebei region. It is committed to providing high-precision and high reliability testing equipment and solutions for material testing, engineering quality control, scientific research experiments and other fields.

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GBT1683 Vulcanized Rubber Compression Set Test

Sulfur-vulcanized rubber compression deformation apparatus: 1. The compression plates consist of a pair of parallel, flat, high-gloss steel plates, with the test specimen placed between them for compression. The surface roughness (Ra) of the compression plates should not exceed 1.6 µm. The compression plates must have sufficient rigidity to prevent deformation under pressure; steel plates are recommended for this purpose. Additionally, the plates should be large enough to ensure that, when the specimen is compressed, it remains entirely within the plate area. A restrictor is used to control the desired compression ratio. The shape and dimensions of the restrictor should be designed to avoid any contact with the compressed specimen. The recommended heights for the restrictor are (8 ± 0.02) mm, (7 + 0.02) mm, or (6 ± 0.02) mm, depending on the specific compression requirements for the specimen. 6. Dimensions: The test specimen is cylindrical, with a diameter of (10 ± 0.2) mm and a height of (10 ± 0.2) mm. Within the same set of specimens, the height difference should not exceed 0.05 mm. 7. Specimen Preparation: The specimens must be directly molded using a vulcanization die, ensuring their surfaces are smooth, perfectly perpendicular, and parallel to each other. The specimens should be free from air bubbles, impurities, or any physical damage. Alternatively, specimens can be cut from sulfur-vulcanized rubber sheets meeting the thickness specifications outlined in Section 5.1, using a circular cutting tool with an inner diameter of (10.2 ± 0.02) mm. During the cutting process, the blade of the cutter may be lightly lubricated with a neutral soap solution, and the cutting action should be performed slowly to minimize tapering of the specimen’s diameter. Note that specimens prepared by these different methods may yield varying test results, making direct comparison of the outcomes inappropriate.

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