In the production of products like cups, kettles and small kitchen appliances that frequently contact high temperatures, improper plastic selection often leads to softening, deformation and other issues. Heat Distortion Temperature (HDT) and Continuous Use Temperature, known as the "golden dual indicators" for judging plastics' high-temperature resistance, have become crucial for material selection.
    HDT refers to the temperature at which a plastic undergoes specified bending deformation under static load, representing the limit of short-term high-temperature deformation resistance. It is tested according to national standard GB/T 1634, and the value under 1.82MPa load is more in line with practical applications. The Continuous Use Temperature is the highest temperature at which the material maintains core performance without significant degradation in long-term high-temperature environments, often referring to the RTI value certified by UL.
    Material selection for different scenarios requires precise matching: products in contact with boiling water and under load need HDT ≥ 90℃ and continuous use temperature ≥ 70℃, suitable for heat-resistant modified PP, etc.; close contact with heat sources requires HDT ≥ 120℃, with glass fiber reinforced materials as the priority. Experts remind that misunderstandings such as confusing the two indicators and ignoring load conditions should be avoided, and scientific material selection should be carried out in combination with wall thickness and contact medium.

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