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Broad-spectrum antimicrobial activity against bacteria, fungi, and algae.
Excellent stability in water-based formulations across a wide pH range (pH 4–10).
Low volatility and minimal odor, supporting safer handling and improved worker comfort.
Compatible with common surfactants, thickeners, and other formulation ingredients.
Effective at low use concentrations, offering cost-efficient microbial control.
Preservation of architectural coatings and decorative paints.
Microbial control in industrial cleaning compounds and detergents.
Stabilization of water-based adhesives and sealants.
Protection of construction chemicals including grouts, mortars, and cementitious slurries.
Preservation of metalworking fluid concentrates and ready-to-use emulsions.
| Chemical Type | Isothiazolinone-based blend (primarily 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one) |
| Product Form | Aqueous solution |
| Appearance | Clear, pale yellow liquid |
| pH (1% aqueous solution) | 2.0 – 4.0 |
| Density (25°C) | 1.02 – 1.06 g/cm³ |
| Active Content | 2.0 – 2.4% w/w total isothiazolinones |
| Solubility | Completely miscible with water |
| Primary Applications | Preservative for water-based industrial and consumer products |
Q1: What is the primary mode of action for DOWICIL QK-20 Biocide?
A: DOWICIL QK-20 Biocide functions as a broad-spectrum preservative through a dual-mechanism action—disrupting microbial cell membranes and interfering with essential intracellular processes. Its formulation is designed to provide effective control against bacteria, yeasts, and molds in water-based industrial systems.
Q2: In which types of formulations is DOWICIL QK-20 typically used?
A: It is commonly incorporated into water-based industrial products such as metalworking fluids, latex paints, adhesives, coatings, construction chemicals, and cleaning concentrates—where long-term microbial stability and low volatility are required.
Q3: How does pH affect the performance and stability of DOWICIL QK-20?
A: DOWICIL QK-20 demonstrates good stability and efficacy across a broad pH range, typically from approximately 4 to 10. Performance may diminish outside this range, especially under strongly alkaline or highly acidic conditions, so compatibility testing in the final formulation is recommended.
Q4: Is DOWICIL QK-20 compatible with common surfactants and thickeners?
A: Yes, it generally exhibits favorable compatibility with nonionic and anionic surfactants, as well as associative and cellulosic thickeners. However, interactions with certain cationic agents or highly reactive functional additives may occur—formulation-specific compatibility assessment is advised.
Q5: What safety and handling precautions should be observed when using DOWICIL QK-20?
A: As with all industrial biocides, appropriate personal protective equipment (PPE) such as gloves and eye protection should be worn during handling. Avoid inhalation of mists or prolonged skin contact. Refer to the Safety Data Sheet (SDS) for detailed toxicological information, first-aid measures, and disposal guidance.
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