General Surface Disinfectant

Ingredients

Component	INCI / Chemical Name	Function	% w/w
BAC 50 % solution (or DDAC 50 %)	Benzalkonium chloride (or Didecyldimethylammonium chloride)	Active disinfectant	1.00
Alkyl polyglucoside (C8–C16)	Coco-glucoside	Wetting agent, co-cleaner	2.00
Ethylenediaminetetraacetic acid, tetrasodium salt	Tetrasodium EDTA	Chelating agent, water softener	0.20
Fragrance (water-soluble)	Parfum	Odor masking	0.10
Deionized water	Aqua	Solvent	96.70
Total			100.00

Addition Order & Process

Procedure: Dissolve tetrasodium EDTA in deionized water at 25–30 °C with low-shear mixing. Add the BAC 50 % (or DDAC 50 %) solution and mix for 10 minutes. Add the APG slowly, avoiding aeration. Add fragrance last and mix for 5 minutes. Adjust pH to 6.5–7.5 with citric acid or dilute sodium hydroxide if required. The final QAC active concentration is 0.5 % w/w, yielding a use-dilution of 1:10 to 1:50 depending on soiling level.

Formulation Notes

This formulation is designed for routine disinfection of hard, non-porous surfaces in domestic and light commercial environments. The QAC concentration (0.5 % active BAC or DDAC) supports bactericidal and fungicidal claims at a 5-minute contact time under EN 1276 and EN 1650, respectively . A non-ionic surfactant (alkyl polyglucoside, APG) provides wetting and light soil removal without complexing the cationic QAC.

Formulation Card FC-11.1-M: General Surface Disinfectant

The pH target of 6–8 optimizes QAC stability and antimicrobial activity . The EDTA sequestrant is critical in hard-water regions: calcium and magnesium ions compete with QACs for binding sites on bacterial cell walls, reducing efficacy by up to 1 log at water hardness > 300 ppm CaCO .