Chemical and Filtration Products of Texas
THPC CAS 124-64-1|THPS CAS 55566-30-8

THPC & THPS Biocides

Phosphonium biocides for oilfield SRB control — prevent H₂S generation, microbiologically influenced corrosion, and reservoir souring in water injection systems.

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Target Organism

SRB, bacteria, fungi

Concentration

75–80% aqueous

DOT Class

8 — Corrosive

Packaging

Drum / Tote / Bulk

THPC vs. THPS — Product Comparison

PropertyTHPCTHPS
CAS Number124-64-155566-30-8
CounterionChloride (Cl⁻)Sulfate (SO₄²⁻)
Molecular Weight190.56 g/mol406.36 g/mol
Concentration75–80% aqueous75% aqueous
Key AdvantageTextile flame retardant + biocideLower chloride — preferred where Cl⁻ is restricted
Primary Oilfield UseInjection water biocideSRB control in produced water

Physical Properties

THPC CAS124-64-1
THPS CAS55566-30-8
AppearanceClear to pale yellow aqueous solution
OdorMild, characteristic
Density (75% soln)~1.30 g/cm³ at 20 °C
pH (as supplied)3–5 (acidic)
SolubilityMiscible with water in all proportions
Flash PointNone (aqueous solution)
StabilityStable under normal storage conditions
Biocide ActivityBroad-spectrum — bacteria, fungi, algae
SRB EfficacyEffective against sulfate-reducing bacteria
Typical Dose Rate50–500 ppm active
THPC — Tetrakis(hydroxymethyl)phosphoniumP+HOCH₂CH₂OHHOCH₂CH₂OHCl⁻CAS 124-64-1 (THPC) | CAS 55566-30-8 (THPS)

Industrial Applications

Oilfield Injection Water

Primary biocide for controlling sulfate-reducing bacteria (SRB) in water injection systems. Prevents H₂S generation, microbiologically influenced corrosion (MIC), and reservoir souring.

Produced Water Treatment

Treats produced water to control SRB and general heterotrophic bacteria before reinjection or disposal. Compatible with most scale inhibitors and corrosion inhibitors.

Drilling Fluids

Biocide in water-based drilling muds to prevent bacterial degradation of starch and other organic additives.

Flame Retardant Textiles (THPC)

THPC is a durable flame retardant for cotton and cotton-blend fabrics. Reacts with cellulose to provide wash-durable flame resistance.

Cooling Water Systems

Controls biofilm and Legionella in cooling towers and recirculating water systems. Effective at low dose rates.

Paper & Pulp

Slimicide in paper mill white water systems to control biofilm and slime-forming bacteria that cause sheet defects.

Safety & Regulatory

NFPA Health3 — Serious hazard
NFPA Flammability0 — Minimal hazard (aqueous)
NFPA Reactivity0 — Stable
OSHA PEL (TWA)No established PEL
DOT Hazard Class8 — Corrosive Liquid
UN Number (THPC)UN 3265
Packing GroupIII
Biocide RegistrationEPA-registered biocide — check SDS for registration numbers

EPA-Registered Biocide

THPC and THPS are registered biocides. Use in accordance with EPA label requirements. SDS and registration information available upon request.

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75–80% aqueous solutions in drums, totes, and bulk tanker delivery across Texas and the Gulf Coast.

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