Key takeaways

• Biocides used in coatings are being restricted, reclassified and/or being phased down.
• Lower biocide levels require a holistic approach.
• Effective preservation in a low biocide world requires tight collaboration across R&D, manufacturing, quality, and purchasing departments.

Across all major regulatory regions, biocides used in architectural, industrial, and wood coatings are being restricted, reclassified, or phased down. What began as hazard based tightening under the EU Biocidal Products Regulation has now become a global movement, fundamentally reshaping how waterborne coatings must be preserved.

The EU remains the most aggressive driver of biocide reduction. A clear example is MIT: in 2020, Europe formally classified MIT as an allergen, triggering mandatory labeling at ≥15 ppm. Prior to 2018, MIT required labeling as a skin sensitizer only when present at ≥1%. This shift illustrates how rapidly allowable use levels can fall and how quickly manufacturers must adapt.

Addressing these changes is no longer a “regulatory nuisance.” It represents a structural transformation in preservation engineering and demands the development of a holistic, multi‑mechanism biocide strategy.

Why Lower Biocide Levels Require a Holistic Preservation Strategy

As allowable biocide levels decline, the traditional “dose‑and‑defend” model collapses. You can no longer dose your way out of contamination. Preservation must become systemic, with the biocide functioning as one component of a broader defensive architecture rather than the primary safeguard.

A modern preservation strategy rests on four coordinated pillars:

1. Formulation Design

2. Manufacturing Hygiene 

3. Packaging & Distribution Controls 

4. Quality Assurance Monitoring

A Practical Strategy for Working at Lower Biocide Levels

1. Formulation Design

• Use boosters that enable effective preservation at lower biocide levels. “Polyboost” from Arxada is one example. 
• Select cleaner raw materials and avoid historically high‑bioburden ingredients. Audit suppliers for contamination control. 
• Consider encapsulated biocides that provide controlled, slow release to maintain long‑term antimicrobial efficacy.

2. Upgrade Manufacturing Hygiene

At reduced biocide levels, plant hygiene becomes a primary preservation mechanism. 

• Implement CIP (clean in place) cycles for tanks, mixers, and transfer lines. 
• Sanitize process water  using UV, peroxide, or equivalent systems. 
• Remove dead legs in piping (areas where water stops moving) to eliminate microbial reservoirs. 
• Schedule biofilm removal using alkaline or oxidizing cleaners. 
• Improve air filtration to reduce airborne contamination.

3. Optimize Packaging & Distribution

Packaging and filling operations can undermine preservation if not tightly controlled. 

• Sterilize filling nozzles and hoses. 
• Control storage and distribution temperatures to prevent warm weather microbial growth acceleration.

4. Implement Continuous Monitoring

Quality Assurance must shift from reactive biocide dosing to continuous monitoring of raw materials, intermediates, and finished goods for contamination.

What This Means for Coatings Manufacturers

Companies that adapt early will gain:

• Regulatory resilience
• Cleaner labeling and easier certification 
• Reduced spoilage losses
• Improved manufacturing consistency 
• Better alignment with retailer and OEM sustainability requirements

Those who delay will face higher failure rates, more batch rejections, and potential loss of market access as biocide limits continue to tighten.

Effective preservation in a low biocide world requires tight collaboration across R&D, manufacturing, quality, and purchasing departments. Only a coordinated, holistic strategy can ensure product stability as regulatory pressure intensifies.

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(photo credit:  image generated by Google Gemini)