The 2012 chromium overstandard incident in the hollow capsule industry served as a profound wake-up call, exposing the severe safety hazards of traditional copper chrome-plated molds. During that period, the chrome plating layer of molds used by some small-scale manufacturers peeled off after long-term use, leading to chromium content in capsules exceeding the standard by thousands of times, which seriously threatened public health. This incident triggered an in-depth industry-wide reflection on mold material safety, ultimately driving a comprehensive material revolution-replacing traditional copper chrome-plated materials with 316L/304 medical-grade stainless steel for capsule molds.
Although the initial investment cost of switching to 316L/304 medical-grade stainless steel molds increased by 300% compared with traditional copper chrome-plated molds, the long-term comprehensive benefits are extremely significant. On the one hand, the corrosion resistance and wear resistance of medical-grade stainless steel are far superior to copper chrome-plated materials, reducing the frequency of mold maintenance and replacement. Data shows that the long-term maintenance cost of stainless steel molds has decreased by 60% compared with traditional molds. On the other hand, stainless steel materials are stable in chemical properties and do not have the risk of heavy metal peeling, which has significantly improved the safety of capsule products. The safety factor of capsules produced with medical-grade stainless steel molds has increased by 100 times, fully meeting the strict national and industrial safety standards.
With the continuous upgrading of the high-end pharmaceutical and health product markets, higher requirements have been put forward for capsule production safety. On the basis of medical-grade stainless steel, the latest food-grade ceramic coating technology has been developed and applied, realizing "zero metal contact" in the capsule production process. The food-grade ceramic coating has excellent non-stick, corrosion-resistant and high-temperature resistant properties. It completely isolates the contact between the mold metal base and the glue solution, avoiding any potential metal ion migration risks. This technology is particularly suitable for the production of high-end pharmaceutical capsules and health product capsules that have strict requirements on purity and safety.
Notably, the food-grade ceramic coating mold technology has successfully obtained EU GMP certification, which means that it meets the international advanced pharmaceutical production standards and has laid a solid foundation for Chinese capsule enterprises to enter the global high-end market. The continuous innovation and upgrading of mold materials, from copper chrome plating to medical-grade stainless steel, and then to food-grade ceramic coatings, not only reflects the industry's emphasis on product safety but also promotes the high-quality development of the entire hollow capsule industry.