Loss on heating
1. Core Definition
● Loss on heating refers to the percentage of mass lost by a silica gel sample when heated under specified conditions of temperature and time. This loss primarily represents volatile substances, mainly moisture. It is a critical quality control parameter used to determine the content of surface-adsorbed water.
2. Purpose and Significance
● Control Moisture Content: To ensure the dryness of the silica gel meets specifications. Excessive moisture can impair its adsorption capacity, flowability, and may cause caking.
● Guarantee Adsorption Capacity: The adsorption capacity of silica gel is finite. If the product itself has high moisture content, its remaining capacity to adsorb external moisture is reduced.
● Indicator of Product Stability: A stable moisture content indicates predictable product performance and shelf life.
Summary
● Loss on heating measures the physically adsorbed surface moisture content at moderate to low temperatures. It is a routine quality indicator for controlling the dryness and initial adsorption performance of silica gel. Adherence to the specified temperature for each silica gel type is critical to obtain accurate results and avoid product damage.
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