SHANGHAI, May 21 (SMM) – Trading in Shanghai tin market remained weak on Friday, with mainstream traded prices for Nanshan, Jinlong, Yunxiang, Yunshan and Yunheng between RMB 153,000-153,500/mt. Some transactions for Nanshan and Jinlong were finally concluded at around RMB 152,700/mt. Transactions for Yunxi were mainly done between RMB 154,000-156,000/mt. Spot tin market remained bleak influenced by the unimproved LME tin prices. Most smelters were not willing to move goods, but some of them were forced to sell due to the excessive inventories. Spot tin prices are likely to drop further on account of the sluggish demand and pessimism in the market.