SHANGHAI, Apr. 18 (SMM) – In the Shanghai physical lead market, goods from Chihong Zn & Ge, Nanfang, and Chengyuan were offered Friday at RMB 13,820/mt, but traded at RMB 13,800/mt, a RMB 10-30/mt premium to the SHFE 1405 contract. Humon and Shuangyan brands were sold at RMB 13,790/mt and RMB 13,770/mt, respectively. Tight supply in the Shanghai market gave cargo holders an incentive to hold prices firm. Downstream producers, however, mostly sat tight Friday despite restocking demand ahead of the weekend, leaving traded volumes comparatively light.