SHANGHAI, Aug 19 (SMM) - According to the SMM research, the bonded zone inventory stood at 8,600 mt this week. The inventory of nickel briquette was 4,000 mt, and that of nickel plate was 4,600 mt, 1,500 mt higher than last week. At present, the downstream still purchases on rigid demand. Besides, some pure nickel arrived at ports this week as some traders have locked in the price ratio. Nickel briquette inventory added 600 mt mainly because of the peak season of new energy industry. In addition, some salt plants purchased the nickel briquette on their rigid demand based on their long-term orders.