Qualified ratio of spherical granules
1. Core Definition
● Qualified ratio of spherical granules refers to the weight or number percentage of particles in a silica gel sample that are close to perfectly spherical in shape. It is a critical quality metric that evaluates the morphological uniformity of the product and the precision of the manufacturing process.
2. Why is this Parameter Critical?
● Flowability：Spherical particles have minimal inter-particle friction, resulting in excellent flowability. This is vital for automated filling, packaging, and ensuring uniform packing in chromatographic columns.
● Mechanical Strength：The spherical structure distributes stress evenly, making these particles typically more resistant to crushing (higher compressive strength) and abrasion, reducing dust generation.
● Packing Uniformity：Uniform spherical particles can form a denser and more homogeneous packed bed. This ensures even fluid distribution and stable performance when used as a catalyst support or desiccant.
● High-End Application Requirements：In many high-end applications, such as HPLC, precision chemistry, and cosmetics, spherical morphology is a default requirement, and a high yield is the entry ticket.
3. Measurement and Evaluation Methods
● Image Analysis: This is the most direct and accurate method. Particles are imaged under a microscope (e.g., Scanning Electron Microscope, SEM), and image analysis software automatically calculates the circularity or sphericity of each particle.
● Criterion: A threshold is set (e.g., circularity > 0.9 qualifies as a spherical particle). A circularity of 1 represents a perfect sphere.
Visual Microscopy: Operators observe and manually count particles under a microscope. This method is more subjective and less efficient but can be used for quick estimation.
Summary
Qualified ratio of spherical granules is a key indicator of the quality grade of silica gel products. It goes beyond simple size control and represents superior manufacturing precision and better, more consistent product performance. This parameter is a core marker distinguishing standard industrial-grade products from high-end, high-value-added ones.
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