Porosity, blowholes, and sand holes are the most common surface defects in jewelry manufacturing, especially in precious metal vacuum casting, gypsum mold precision casting, and wax-set casting. Jewelry requires ultra-high surface finish and fine detail retention, so even small holes will damage appearance, reduce density, weaken mechanical strength, and cause cracking or stone loss in later proce···

In the grand picture of the foundry industry, people's attention often focuses on precision sand casting, advanced die-casting processes, or investment casting of complex parts. However, at the most fundamental level of this manufacturing pyramid - the preparation of metal raw materials - a silent yet fundamental transformation is taking place. Ingot casting, which was once considered a "···

2026SpringFestivalHolidayNoticeFactory & Shop holiday Time February 12，2026 – February 23, 2026，and normal work and production will resume on February 24.We will be accepting orders as usual during the holiday and will be online to answer your inquiries.Wishing you and your family a joyful Spring Festival! Good health, happiness, success, and prosperity!Yihui Casting Technology Co., Ltd. wa···