tender for purchase of chemicals , purchase of chemicals , melamine (2,4,6-triamino-1,3,5-triazine); assay: =99%; 500gm , sodium formate; annual repair grade/acs, assay: =99%; 500gm , glycine; annual repair grade/acs, assay: =99%; 250gm , n, n-dimethylformamide; annual repair grade; 500 ml , indium (iii) nitrate hydrate; white color, lump/powder form, =0.01% (100 ppm) metal impurities; 10g , boron powder; b-10 abundance; =95.0%, -60+100 mesh, powder or crystalline powder, total metal impurities: =0.1%; 5g , chromium powder; -60 mesh, 99.95%, powder form, total metal impurities: =0.05%; 100g , vanadium (iii) chloride 97%; dark blue to violet to black, titration argentometric=96.0 %, powder form, insoluble matter =0.5 % (in water); 5g , tin powder; powder, 150 ?m, 99.5% trace metals basis; 100g , antimony powder; powder, -100 mesh, 99.5% trace metals basis; 250g , trimesic acid (benzene-1,3,5-tricarboxylic acid); solubility (turbidity) 2.5% in ethanol, white powder, titration with naoh: 94.5 - 105.5 %; 100g , aluminum powder, =99.5%; complexometric edta: 91 %, iron (fe): 0.5 %, heavy metals: 0.03 %; 500g , carbon paper; black, smooth surface,100 mm width x 100 mm length x 0.4 mm thickness, density: ~0.4-0.7 g/cm³; 1 pc