Recently, the customs officers of Fangcheng Customs under Nanning Customs conducted a weight assessment on a batch of imported chromium ore with an declared weight of 20,000 tons. They discovered that the actual unloading weight of this batch of chromium ore was 367.92 tons less than the declared we

The carbon graphite rings used in mechanical seals. During the sintering process, there will be pyrolysis substances and pores discharged, and the porosity, calculated by volume, accounts for approximately 10% to 30%. This porous carbon graphite ring cannot be used as a mechanical seal ring. Therefo