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Broad-spectrum efficacy against bacteria, fungi, and algae in industrial water systems.
Stable performance across a wide pH range (pH 4–10) and tolerant to common water treatment additives.
Low foaming formulation suitable for high-shear and recirculating cooling water applications.
Compatible with common corrosion inhibitors and scale control agents without compromising biocidal activity.
Non-oxidizing chemistry minimizes material compatibility concerns with carbon steel, copper alloys, and stainless steels.
Cooling water systems in power generation and HVAC facilities.
Process water circuits in chemical manufacturing and petrochemical plants.
Once-through and closed-loop industrial water systems requiring non-oxidizing biocide control.
Make-up water treatment for evaporative condensers and cooling towers.
Preventive biofouling control in heat exchangers and piping networks.
| Chemical Type | Non-oxidizing heterocyclic biocide (isothiazolinone-based) |
| Product Form | Liquid concentrate |
| Appearance | Clear, pale yellow liquid |
| pH (as supplied) | 3.0 – 4.5 |
| Density (20°C) | 1.08 – 1.12 g/cm³ |
| Solubility | Completely miscible with water |
| Storage Stability | ≥12 months at 5–30°C in original unopened container |
| Primary Applications | Industrial cooling water, process water, and closed-loop systems |
Q1: What types of microorganisms does Hoffmann QB-20 Biocide effectively control?
A: Hoffmann QB-20 Biocide is a broad-spectrum antimicrobial agent designed to inhibit the growth of bacteria, fungi, and yeasts commonly encountered in water-based industrial formulations, including cooling water systems, metalworking fluids, and latex emulsions.
Q2: Is Hoffmann QB-20 Biocide compatible with common industrial additives and surfactants?
A: Yes, QB-20 demonstrates good compatibility with many anionic, nonionic, and cationic surfactants, as well as common corrosion inhibitors and defoamers—though compatibility should always be verified under actual formulation conditions due to system-specific interactions.
Q3: How should Hoffmann QB-20 Biocide be dosed in a typical application?
A: Dosage depends on formulation requirements, microbial challenge level, and process conditions. It is typically used at low concentrations—generally ranging from 0.1% to 2% by weight—applied during initial charge or as a maintenance dose to sustain preservative efficacy.
Q4: Does Hoffmann QB-20 Biocide require pH adjustment for optimal performance?
A: QB-20 performs effectively across a moderately broad pH range, typically between 5.0 and 9.5. Significant deviations outside this range may reduce stability or biocidal activity, so maintaining formulation pH within this window is recommended for consistent performance.
Q5: Can Hoffmann QB-20 Biocide be used in both open and closed-loop industrial water systems?
A: Yes, QB-20 is suitable for use in both open recirculating systems (e.g., cooling towers) and closed-loop systems (e.g., chilled water or heating circuits), provided adequate contact time, proper dispersion, and routine monitoring are maintained to ensure continuous microbial control.
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E-mail: wangxingqiang@ericwchem.com
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