Na4O40SiW12 is a chemical compound registered under CAS number 12027-47-3, with the molecular formula Na. 1/4 O40 Si W12 and a molecular weight of about 2966.1 g/mol. Its EINECS (EC) number is 234-720-3. It is also known as Tetrasodium 12-wolframosilicate. TwoChem supplies Na4O40SiW12 for laboratory research and bulk production; product code 1146982. Send an inquiry for purity, packaging, price and lead time.