Tetrakis(hydroxymethyl)phosphonium sulfate CAS 55566-30-8
This is THPS, 4-hydroxy methyl phosphonic acid, with CAS number 55566-30-8. It is a green, low-toxicity, rapidly degradable quaternary ammonium salt fungicide / flame retardant.Appearance: Colorless and transparent acidic liquid (commonly a 50% - 75% aqueous solution), without strong irritating odor.pH: 3 - 4; Soluble in water and can be mixed with polar solvents
✅ Rapid degradation: After use, it decomposes into phosphate, ammonia, and water, with no long-term residue.
✅ Highly effective and broad-spectrum: Strongly kills bacteria, fungi, and algae; low dosage, quick effect.
✅ Good stability: Acidic stable, resistant to heat / hard water; hydrolyzed and inactivated in alkaline conditions.
| Item | Specifications |
| Appearance | Powder |
| Boiling point | 123 - 126 °C |
| Storage | Store at 2-8℃. |
1. Industrial Water Treatment (Main)
Tetrakis(hydroxymethyl)phosphonium sulfate is used for circulating cooling water, oilfield injection water, papermaking white water, sewage systems: kills bacteria / algae, controls sludge, prevents corrosion; suitable for high salt / high temperature / hard water, degrades quickly, no residue, low foam.
2. Oilfield
Drilling fluid / completion fluid: inhibits sulfate-reducing bacteria (SRB), prevents pipeline corrosion; compatibility is good.
3. Aquaculture
Fish ponds / shrimp ponds: improves bottom condition, kills bacteria and controls algae, improves black and odorous water; decomposes into harmless phosphates, safe for aquatic life.
4. Textile Flame Retardant
Tetrakis(hydroxymethyl)phosphonium sulfate is used for permanent flame retardant finishing of cotton / cotton-polyester fabrics, resistant to washing, low toxicity, environmentally friendly.
5. Others Paper anti-corrosion, coating anti-mildew, leather tanning agent, etc.
• Standard Packing: 25 kg/drum
• MOQ: to be confirmed by grade and destination
• Lead Time: to be confirmed by order quantity and production schedule
• Shipping: sea / air / express options available
• Store in a cool, dry, and well-ventilated place.
• Keep container tightly closed and protected from moisture.
• Avoid direct sunlight, heat, and open flame.
• Follow SDS guidance for incompatible materials.
