1.2.1 Equipment Use: Determination of Benzene Crystallization Point. The crystallization point of benzene is determined according to the national standard GB/T 3145-1982, which provides a detailed procedure for measuring the temperature at which benzene begins to solidify. For naphthalene, the crystallization point is tested in accordance with GB/T 3069.2-2005, ensuring accurate and consistent results across different samples. When it comes to industrial phenol, the crystallization point is assessed using GB/T 3710-2009, which specifies the method for determining the point at which phenol starts to crystallize. Additionally, the crystallization point of organic chemical products is measured following GB/T 7533-1993 (revised in 2005), while chemical reagents are analyzed according to GB/T 618-2006. For plasticizers, the crystallization point is determined based on GB/T 1663-2001, which outlines the appropriate testing conditions and procedures. These standards ensure that the crystallization points are measured accurately, enabling quality control and compliance with industry specifications. Each test method is designed to be reliable, repeatable, and suitable for its respective application, providing essential data for product evaluation and performance assessment.
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