2,4-Toluenediamine

2,4-Toluenediamine carries a methyl group and two amino groups on the same benzene ring, in the specific 2,4-arrangement that makes it the dominant commercial isomer of toluenediamine traded for industrial use. We want to be careful about which carcinogen classification is the relevant benchmark here: the EU's harmonised CLP Annex VI entry lists this compound as Carc. 1B (H350, presumed to have carcinogenic potential for humans, based on genotoxic-carcinogen evidence), a materially stricter classification than Japan's self-classified Category 2 listing that is sometimes cited instead. We use the EU's harmonised entry as the correct reference point for this page, since it reflects a formal regulatory determination rather than a single country's self-classification.

Its best-documented commercial role is as the precursor to toluene diisocyanate (TDI) via phosgenation, TDI being the key monomer in polyurethane foam manufacture -- an industrially enormous downstream market, though one where this amine itself is consumed entirely within the TDI production process rather than traded onward as a foam raw material. It is also documented as a dye-chemistry intermediate. Separately and specifically, the EU's cosmetics regulation (Regulation (EC) No 1223/2009 and its annexes) bans this substance from use as an ingredient in cosmetic products, including hair dyes, given its genotoxic-carcinogen classification -- a ban we state plainly rather than leave ambiguous.

Where it fits in the synthesis chain

We supply 2,4-Toluenediamine itself as a TDI-chain and dye-chemistry intermediate. We do not manufacture or supply toluene diisocyanate, polyurethane products, or any cosmetic or dye product -- and we do not supply this substance for use in any cosmetic application, consistent with its EU cosmetics-regulation ban.

Grades we supply

99%+ is the standard commercial grade for industrial (non-cosmetic) use.

2,4-Toluenediamine is made industrially by reduction of 2,4-dinitrotoluene, itself made by dinitration of toluene, converting both nitro groups to amino groups in a single reduction step.

The reduction step uses catalytic hydrogenation under controlled conditions to ensure full conversion of both nitro groups and to minimise formation of partially reduced nitroamine by-products.

The crude product is purified by distillation or crystallisation, separated from the minor 2,6-isomer that forms alongside it during dinitration, and packed under conditions that limit air and light exposure.

EU Carc. 1B is the correct benchmark here, not Japan's Category 2

We want to state this choice explicitly rather than leave two different national classifications sitting unreconciled. The EU's harmonised CLP Annex VI entry for this compound is Carc. 1B (H350), based on genotoxic-carcinogen evidence -- a formal regulatory determination. Japan's NITE self-classification lists a milder Category 2. Self-classifications by definition reflect one classifier's reading of the data and can differ in either direction from a harmonised regulatory entry; here, the EU's stricter, formally adopted classification is the more authoritative reference, and we use it as this page's primary classification rather than averaging the two or defaulting to the milder figure.