Denatured Alcohol Preservative Free Percentage?

I normally make alcohol free aftershaves, but my new venture is to work with denatured alcohol so I can create alcohol aftershaves and colognes. Reading labels I see some alcohol based aftershaves have no preservatives. Since products that have water require a preservative, where can I find what the minimum denatured alcohol percentage must be to not have a preservative?
Here's, an example, the ingredients of an aftershave that I have.
Alcohol Denat., Aqua, Citrus Aurantium Dulcis (Sweet Orange) Peel Extract, Myristica Fragans (Nutmeg) Oil, Piper Nigrum (Black Pepper) Extract, Canarium Luzonicum (Elemi) oil, Pelargonium Graveolens (Geranium) Oil, Pogostemon Cablin (Patchouli) Oil, Vetiveria Zizanoides (Vetiver) Oil, Parfum (Fragrance), Isopropyl Myristate, Linalool, Amyl Cinnamal, Citronellol, Hydroxycitronellal, Limonene

Comments

  • PharmaPharma Member, Pharmacist
    Rule of thumbs:
    >20%: Microbes stop growing
    40-70%: Microbes die
    >70%: Useless
  • Pharma said:
    Rule of thumbs:
    >20%: Microbes stop growing
    40-70%: Microbes die
    >70%: Useless
     Is >70%: Useless defined as, we can't use this high of an amount?
    Thanks.
  • PharmaPharma Member, Pharmacist
    For disinfection, a certain amount of water is required. Nearly anhydrous alcohol shows some activity against flue viruses but apart from that niche use, everything above 70% is wasted money IMHO.
  • CosmoManCosmoMan Member
    edited October 13

    Pharma,
    I'd like to say thank you. 
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