supply of lead tablets 17.5 mm dia for sealing to fig 1 of irs specn. z-14/71. to be made from secondary leads to is:3717/1977 [amendment no. 2 of nov 2021] purity 99.80.each packet size should be 01 or 2 kg.lead tablets 17.5 mm dia for sealing to fig 1 of irs specn. z-14/71. to be made from secondary leads to is:3717/1977 [amendment no. 2 of nov 2021] purity 99.80.each packet size should be 01 or 2 kg.,lead tablets 17.5 mm dia for sealing to fig 1 of irs specn. z-14/71. to be made fro m secondary leads to is:3717/1977 [amendment no. 2 of nov 2021] purity 99.80.each packet size s hould be 01 or 2 kg. [ warranty period: 30 months after the date of delivery ] ]