Dimethyl dicarbonate (E242)

No. Dimethyl dicarbonate (E242) is not one of the markers Open Food Facts uses to classify a food as processed or ultra-processed, so on its own it doesn't raise a product's NOVA group.

What it is

Preservatives are substances which prolong the shelf-life of foods by protecting them against deterioration caused by micro-organisms and/or which protect against growth of pathogenic micro-organisms.

A product that contains it can still be ultra-processed for other reasons: 12 of the 12 products here that contain dimethyl dicarbonate (E242) (100%) are in group 4 because of other ingredients or additives.

Function

Preservative: Preservatives are substances which prolong the shelf-life of foods by protecting them against deterioration caused by micro-organisms and/or which protect against growth of pathogenic micro-organisms.

Functional class definitions from the EU food additives regulation, via Open Food Facts.

More about dimethyl dicarbonate (E242) on Wikidata