Supplier Page from Thermo Fisher Scientific for Niobium slug, 3.175mm (0.125in) dia x 3.175mm (0.125in) length, 99.95% (metals basis excluding Ta)
Ethanethiol, 99+% from Thermo Fisher Scientific
Ethyl chloroformate, 99% from Thermo Fisher Scientific
Ethylmercurithiosalicylic acid, sodium salt, 97.0-101.0% from Thermo Fisher Scientific
Iron(III) acetylacetonate, 99+% from Thermo Fisher Scientific