Performance indicators of polyurethane products

　　For everyday items, our perception is intuitive, encompassing concepts like hardness, elasticity, toughness, and brittleness. This information, obtained through direct sensation and perception, is generally called qualitative judgment. Qualitative judgments are usually vague, inaccurate, and not conducive to comparison. For example, we know that iron is hard and steel is also hard, but which one is harder? Besides striking them against each other, is there another standard to measure their hardness? Is there a universal standard to measure the properties of different materials for easier description and dissemination?

　　In fact, various industries have established standard measurement tests (industry standards) for product performance in their respective fields. China has also developed standard tests (national standards, GB) for various products and their indicators. By comparing the performance values of various materials measured in standard tests, we can have a clearer understanding of materials in daily life. The following will introduce the performance and testing involved in the daily use of polyurethane products (PU products).