Group 1 - The core focus of the articles is on the standards and methods for precious metal testing, including gold, silver, and platinum group metals, which are used in jewelry, electronics, and chemical catalysis [1][2]. - The testing center collaborates with laboratories equipped with high-precision X-ray fluorescence spectrometers and density balances to ensure accurate and reliable results in precious metal quality inspection [2]. Group 2 - Testing standards include purity detection, mechanical performance testing, and density measurement, adhering to GB and ISO standards [3]. - Specific purity analysis standards are set for gold (≥990‰ for pure gold), silver (≥925‰ for sterling silver), and platinum (≥950‰ for Pt950) [3]. - Mechanical properties such as Vickers hardness, tensile strength, and ductility are also measured, with specific values outlined for different types of precious metals [3]. Group 3 - The methods of testing include X-ray fluorescence for non-destructive analysis, density measurement using Archimedes' principle, and Vickers hardness testing for thin-walled jewelry [3].

Core Insights - The company has achieved a record of continuous operation for 36 hours in the precious metal silver ingot measurement position, enhancing the momentum for month-end production [1] - The internal inspection workshop has optimized the silver ingot measurement process, reducing the detection time for a single batch to under 24 hours, and improving monthly detection efficiency by 30% [3] - The company has implemented a flexible management model to address personnel shortages and increased tasks, ensuring 24-hour uninterrupted detection through a "two-shift" system led by young technical backbones [3][5] - Smart upgrades have been introduced, including automatic measurement machines that reduce detection time from 1 minute to 10 seconds, and a fully automated packaging project that decreases labor intensity by 60% [5] - The internal inspection workshop aims for "zero errors, zero delays, and zero complaints" while continuing to deepen smart transformation and optimize collaborative mechanisms for high-quality development in the precious metal industry [5]