Salicylic acid-free curing agents

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Salicylic acid is an efficient catalyst of the epoxy-amine reaction. It has therefore been used for half a century as an accelerator in the formulation of amine-based hardeners for epoxy resins.

However, the classification of salicylic acid as a CMR (carcinogenic/mutagenic/reprotoxic) substance has caused its use in formulated products to be re-assessed. Since May 1st 2020, the use of salicylic acid in formulated products is considered safe up to 3% m/m; above that concentration limit, the product should be treated as a CMR and should be classified and labelled accordingly.

In view of this situation, in QR Polymers we have decided to reformulate some of our epoxy curing agents and make them completely free of salicylic acid. Our new hardeners Q-RIT 315, Q-RIT 317 and Q-RIT 318 contain 0% salicylic acid. Not only are they compliant with the latest regulations, they also respond to our customers’ continuous search for more friendly product for now and for the future.

HardenersSolids
(% m/m)
Viscosity @25°C (mPa.s)HEW
(g/Eq)
Gel time
(minutes) (a)
Uses and comments
Q-RIT 315100250-55011530Salicylic acid-free. UV-resistance. Good mechanical, acid and solvent resistance.
phr 60 (liquid resin, EEW 190)
Q-RIT 317100150-4509340Salicylic acid-free. Superior resistance to carbamation / waterspotting. Good colour stability, good chemical resistance. For solvenfree self-leveling floorings, and paints.
phr 50 (liquid resin, EEW 190)
Q-RIT 318100150-4509330Salicylic acid-free. Superior resistance to carbamation / waterspotting. Good colour stability, good chemical resistance. For solvenfree self-leveling floorings, and paints.
phr 50 (liquid resin, EEW 190)