Isothiazolinone Biocide for Metalworking Fluids
Isothiazolinone-based biocides are the most widely used antimicrobial additives in water-miscible metalworking fluids, preventing bacterial and fungal contamination that causes fluid degradation, unpleasant odors, and health risks for machine operators. Blends of 5-chloro-2-methyl-4-isothiazolin-3-one (CMIT) and 2-methyl-4-isothiazolin-3-one (MIT) provide broad-spectrum efficacy against bacteria, yeast, and molds at low concentrations. Proper biocide management extends metalworking fluid service life and reduces disposal costs.
Technical Specifications
| pH | 2.0–5.0 |
| appearance | Colorless to pale yellow aqueous solution |
| MIT content | 0.5–1.0 wt% (in CMIT/MIT 3:1 blend) |
| CMIT content | 1.5–3.0 wt% (in CMIT/MIT 3:1 blend) |
| density (20°C) | 1.00–1.05 g/cm³ |
| recommended treat rate in MWF | 0.05–0.2 wt% active |
Applications
- Water-miscible metalworking fluids (emulsions, semi-synthetics, and synthetics)
- Neat metalworking fluid preservative against aerobic and anaerobic contamination
- Hydraulic system microbial control in water-glycol hydraulic fluids
- Coolant tower and industrial water systems biocide treatment
- Industrial cleaning and degreasing fluid preservation
Key Features
- Broad-spectrum antimicrobial efficacy against bacteria, yeast, and molds at low ppm treat rates
- Water-soluble formulation for easy incorporation into water-miscible metalworking fluids
- Fast-acting kill kinetics for rapid microbial population control after contamination event
- Compatible with common metalworking fluid chemistries including amine, borate, and mineral oil emulsions
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