T/JAMIA 006-2024 spherical silicone resin

Scope

Main Technical Content: The performance requirements of spherical silicone resin shall comply with the requirements in Table 1. **Table 1: Performance Requirements** **Item** **Requirement** **Sphericality** ≥ 0.9 **Average Particle Size (μm)** 1.0–6.0 **Volatile Matter (%)** ≤ 2.0 **Whiteness (%) > 90** **pH Value** 6.5–7.5 **Thermal Loss (% at 250°C ± 2°C/3h)** ≤ 5 **Bulk Density (g/cm3)** 0.45–0.75 **Net Content** Shall comply with the provisions of the *Measures for the Supervision and Management of Quantitative Packaged Commodities*. **5. Test Methods** **5.1 Appearance** Place the sample in a clean, dry, transparent 100mL beaker. Observe it with the naked eye at a distance of 30–50 cm from the human eye under a light source with an illuminance of not less than 1000 lux. **5.2 Sphericality** **5.2.1 Reagents and Materials** Sodium hexametaphosphate, analytical grade, with a mass fraction of 0.5%. **5.2.2 Equipment** Microscope: with a CCD module and a pixel resolution of not less than 1 million, and a magnification of not less than 100x. Computer: equipped with image processing software. **5.2.3 Operating Steps** Use 0.5% sodium hexametaphosphate as a dispersion medium to evenly disperse a suitable amount of the sample on a glass slide. Observe the sample under a microscope and adjust the focus to the clearest field of view. Select an area with well-dispersed particles in the field of view and record the image on the computer. Analyze the recorded image using image processing software to determine the projected area and perimeter length of each particle. **5.2.4 Calculation of Sphericality** Calculate the sphericality of a single particle according to Equation (1): () where: —— The measured sphericality of a single particle; —— The projected area of the particle, in square micrometers (μm2); —— The perimeter length of the projected particle, in micrometers (μm). The result of spheric

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