Hexamethylenediamine Tetramethylene Phosphonic Acid (HMTPMP)
CAS Number: 34690-00-1
HMTPMP is a high-performance organophosphonate scale and corrosion inhibitor used in cooling water and oilfield systems. Its hexamethylene backbone provides superior tolerance to calcium hardness and excellent threshold inhibition against sulfate and carbonate scales. It also offers moderate iron and manganese chelation to prevent deposition.
Technical Specifications
| density | 1.22–1.28 g/cm³ |
| appearance | Light amber to amber liquid |
| active content | 25–30% |
| pH as supplied | 1.5–2.5 |
| molecular weight | 710 g/mol |
| phosphorus content as PO4 | 18–22% |
Applications
- High-hardness cooling water scale inhibition
- Oilfield injection water antiscalant
- Desalination plant scale control in concentrate streams
- Industrial process water with high sulfate scaling tendency
- Combined scale and corrosion inhibitor programs
Key Features
- Exceptional calcium sulfate and carbonate scale inhibition at high hardness
- Iron and manganese chelation prevents precipitate-induced fouling
- High thermal stability — effective in systems up to 200°C
- Low dosage effective (1–5 mg/L) reducing chemical costs
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