Biocides are usually added to paint formulations to maintain the product’s integrity and inhibit the growth of germs and bacteria on a variety of surfaces.

Lonza biocides help to preserve products in the can as well as after application. Lonza offers two complementary ranges of products to address the challenges faced by formulators: Omadine® and Proxel®.

Lonza MIT-free In-can preservatives

To address the evolving regulatory landscape in Europe, Lonza has a full line of MIT-free preservatives based on novel Pyrithione chemistry:
- Proxel® BZ Plus Preservative and Proxel® LS Preservative are MIT-free formulations available worldwide which offer long-term, robust protection to preserve formulators' products.
- The recently launched Proxel Spektra™ Preservative has been specifically designed for Europe.
Indeed, MIT (2-methylisothiazol-3(2H)-one (ISO)) should be classified as a highly potent skin sensitizer meaning labelling as H317 (formerly R43) with a specific concentration limit (SCL) of 0.0015% (15ppm) and above. In fact, within the next two years, the trigger limit for MIT will be reduced from 1000 ppm to a maximum of 15 ppm.

For sure, this changing regulatory environment will impact coating formulators! Make sure that you will be ready for this change!

Find out more about Lonza MIT-free solutions:

Proxel® BZ Plus Proxel® LS Proxel Spektra™
Active content 5% BIT + 5% Zinc
2% BIT + 8%
Sodium Pyrithione
2% BIT + 4%
Sodium Pyrithione
Description White dispersion Pale yellow
Clear/Pale Yellow
Viscosity 3500 - 5000 mPa 1 - 5 mPa 1 - 5 mPa
pH 6 - 8.5 9 - 9.5 11 - 13
Suggested dose 0.05 - 0.3% 0.1 - 0.4% 0.1 - 0.4%
Table 1: Lonza Proxel® preservatives properties
To give an illustration of the unique advantages of Lonza MIT-free alternatives, see below the results obtained with Proxel Spektra™ Preservative:

Proxel Spektra™ Preservative (2% BIT + 4% NaPT) is
ArrowAn innovative combination of two highly effective active ingredients with different modes of action which gives a broad spectrum of activity
ArrowTemperature and pH stable
ArrowA cost-effective solution
ArrowA low viscosity product for easy handling
ArrowFree of toxic heavy metals

Material pH Challenge Type Pass Level
Interior latex paint 8.6 Bacterial 0.15%
Styrene-butadiene emulsion 7.3 Bacterial 0.10%
Calcium carbonate joint compound 8.7 Bacterial 0.10%
Polymer emulsion 8.3 Bacterial 0.15%
Black pigment dispersion 8.7 Bacterial 0.15%
Acrylic emulsion polymer 8.7 Bacterial 0.075%
Water based plaster preparation 7.5 Bacterial 0.25%
Table 2: Results with Proxel Spektra™ preservative in an industry standard antimicrobial challenge test
⇨ 0.25% (or less) of Proxel Spektra™ preservative effectively preserved all the above listed materials.

To access the results with Proxel® BZ Plus Preservative and Proxel® LS Preservative, download the presentation: MIT-Free Alternatives to Meet New Challenges.


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