Why isn’t there a disinfectant chemical that kills 100 percent of bacteria, why every chemical says kills 99 percent?

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  • 11 months ago
    Favorite Answer

    There are products that are capable of killing 100% of pathogens. They are called sterilants. . Disinfectants by definition only kill some pathogens. The number is a marketing phrase that really has no meaning other than the fact that is it not capable of sterilizing all surfaces. A product cannot legally claim to kill 100% unless its an EPA-registered sterilant. So manufacturers make up numbers that have no legal meaning or practical meaning either. Even if a product is capable of killing 100% of all pathogens, it usually needs to be applied in a certain way and left on the surface for a certain amount of time. Most people never read the directions or follow them even if they do bother to read them.

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  • 11 months ago

    Because there's always some weird bacteria out there that can survive through anything.

    Also, they don't want to guarantee is 100% in case someone sues them over it.

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  • 11 months ago

    because that's impossible …………….

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  • 11 months ago

    Some do, such as soaking a glass dish in sulfuric acid. But for those safe to use around the house, the companies do not want to get accused of making false claims so they say 99%, giving them a fudge factor in case their product does not kill everything. Their lawyers make them do it.

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  • Pearl
    Lv 7
    11 months ago

    cause its possible part of it wont work

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  • Anonymous
    11 months ago

    Like all other 'living' organisms, germs evolve and get better at doing what they do. and ONE of those steps in evolution is getting better at protecting yourself from enemies. some animals develop claws, bigger sharper teeth, faster legs, better camouflage, but to a germ getting 'killed' is from disinfectants, so they develop immunities to them over time.............

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  • 11 months ago

    Bacteria are living organisms which tend to change and adapt. When and how this happens is usually unknown. So, say for instance, a 100% effective product was invented. By the time it goes through testing, distribution and marketing phases, there is always the possibility that some of the bacteria have mutated, rendering the product less than 100% effective. Smart little buggers!

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  • Andy C
    Lv 7
    11 months ago

    There are ones that kill 99.99%. Even 99.99999%, but these would damage you.

    99% is bc life is tenacious and evolution happens. Eventually, life may grow in a bottle of isopropyl alcohol. Life means no guarantees.

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  • 11 months ago

    Well if you mix it with boiling water then it becomes 💯 effective

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  • 11 months ago

    You can't guarantee that the entire surface will be sanitized without going through more steps than just spraying a disinfectant onto it.

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