[Didecyl dimethyl ammonium chloride]1 is the third generation of quaternary ammonium compounds, and it is better than the first and second generation products on ability of killing microorganism.

Didecyl dimethyl ammonium chloride(DDAC) is mainly used as following fields:

1. Used as fungicide of injection water of oilfield and industrial circulating cooling water.
2. Used as disinfectant, fungicide and wood preservative agents.
3. Used as moth-proofing agents of textile.
4. It can be used compounding with CLO2 when handling hard surface to killing bacteria.

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