| Termini | Standard |
| NaOH%: | 98.5-99 % min |
| Na2C03 %: | 0.50-0.80% max |
| NaCl%: | 0.02-0.04% max |
| Fe2O3 % | 0.002-0.004% max |
| SiO2 % | 0.003-0.008 max |
| NaCl03% | 0.005% max |
| Na2S04 %: | 0.01-0.02% max |
| A1203%: | 0.004-0.005% max |
| % CaO: | 0.001-0.003% max |