Name: In-Can Preservative CMIT/MIT 1.5% Blend
Brand: Coatingsink
SKU: in-can-preservative-cmit-mit
Availability: InStock

Question 1

What is the effective active CMIT/MIT concentration needed for in-can preservation and how does that translate to dosage of this 1.5% blend?

Accepted Answer

Waterborne paints typically require 0.01–0.03% active CMIT/MIT (100–300 ppm active) for robust in-can preservation against bacteria and yeast. Using this 1.5% blend, that corresponds to an addition level of 0.67–2.0% on total paint weight. Start at 1.0% (150 ppm active) for initial trials; increase to 2.0% for high-pH or high-fill systems where isothiazolinone stability is reduced.

Question 2

Are there formulation conditions that reduce the efficacy of CMIT/MIT preservation?

Accepted Answer

Yes. CMIT/MIT is nucleophile-sensitive and degrades rapidly above pH 8.5, in the presence of sulfur-containing components (e.g. zinc oxide, mercaptobenzothiazole), or with reducing agents. Amine-functional dispersants and high concentrations of primary amines can also quench activity. For high-pH alkyd emulsion or zinc-rich primers, a paired biocide system using a BIT (benzisothiazolinone) or OIT co-preservative is recommended.

Question 3

What regulatory framework applies to CMIT/MIT in-can preservatives sold in the EU?

Accepted Answer

CMIT/MIT (mixture active substance CAS 55965-84-9) is approved under EU Biocidal Products Regulation (BPR) 528/2012 for Product-Type 6 (in-can preservatives for paints). Formulated products must be authorised under the Union Authorisation or national authorisation routes. Products containing ≥0.0015% CMIT/MIT in the final paint must be labelled with the EUH208 statement referencing the mixture. SDS classification as Skin Sensitiser Cat. 1A applies.

CMIT:MIT Ratio	3:1
Density (25°C)	1.02 g/ml
pH (as supplied)	2.5–4.0
Active Content (CMIT+MIT)	1.5%
Recommended In-Can Dosage	0.5–2.0% (achieving 0.01–0.03% active)

In-Can Preservative CMIT/MIT 1.5% Blend

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