Top 12 Tetramethylammonium Hydroxide Frequently Asked Questions

  1. What are the main applications for TMAH? Photolithography(including EUV), etching, cleaning, formulation component. Is is also used in polymer, electrolyte and photovoltaic applications.
  2. What is the usual concentration of TMAH? Commercially most use 25% aqueous solution. Also sold as 2.38% developer solution.
  3. What benefits does TMAH provide in semiconductor manufacturing? Available in high volume and high purity. Ionic liquid providing metal ion free, strong organic base. High selective silicon etchant.
  4. Is TMAH toxic? Yes, as all chemicals TMAH has a toxicity profile. However, it has been used safely for many years using proper methods and procedures.
  5. Are there alternatives to TMAH? Yes, multiple higher molecular weight quaternary hydroxides and can be used as alternatives for TMAH.
  6. Does the purity of TMAH matter? Yes! Metals and particles are the most common impurities, particularly in semiconductor applications.
  7. What are ways to safely handle TMAH? It is toxic and corrosive and safety measures for both should be considered when handling. If you are interested, SACHEM has a safety presentation available. Click here to learn more.
  8. What are ways to dispose of TMAH? Proper disposal should be followed according to the SDS. Click here for the SDS
  9. Is TMAH available globally? Yes, TMAH is manufactured in the US and Asia and is available globally.
  10. What are typical packages for TMAH? Typically in drums, IBC’s, or ISO delivery (tank wagon).
  11. Can TMAH be recycled? Yes. SACHEM’s Mobius Technology provides TMAH reclaim and recycling.
  12. What materials of construction are recommended for TMAH? MOC for non high purity applications, MOC for high purity applications
"Top 12 Tetramethylammonium Hydroxide Frequently Asked Questions"