Structure2-Phosphonobutane-1.2.4.-tricarboxylic acid 4Na (PBTC 4Na)
CAS No. 66669-53-2
EC No. n/a
Synonyms Tetrasodium 2-(carboxymethyl)-2-phosphonato-glutarate; tetrasodium 2-(carboxymethyl)-2-phosphonatopentanedioate; tetrasodium 2-(carboxymethyl)-2-phosphonato-pentanedioate; Tetrasodium hydrogen 2-phosphonatobutane-1,2,4-tricarboxylate

2-Phosphonobutane-1.2.4.-tricarboxylic acid 4Na (PBTC 4Na)

​2-Phosphonobutane-1,2,4,-tricarboxylic Acid tetra sodium salt (PBTC 4Na) is available as a 41% aqueous solution. It is a very effective scale inhibitor used in various industrial applications. Due its higher performance properties it is a very cost effective inhibitor compared to standard Phosphonates such as HEDP/ATMP. This is mainly due to superior stability to chlorine, bleach and bromine. In cooling water PBTC 4Na performs well at high PH or temperatures. It further shows high effectiveness in high alkaline solutions such as industrial cleaners.


  • Cooling water systems / industrial water treatment
  • Industrial detergents
  • Disinfectants
  • Liquid dishwashing concentrates
  • Metal surface treatment as corrosion inhibitor for steel
  • Retardant in concrete
  • Sequestering agent in textile auxiliaries

Shelf Life

Under proper storage conditions, the shelf life is 12 months

Health & Safety

Detailed information on the product described can be found in our relevant Health and Safety Information (Material Safety Data Sheet).