This home improvement product company web page about an anti-mold product called Concrobium https://www.concrobium.com/products/mold-control-spray/ has the following table:

Ingredient              Cas #       Function
Water                   7732-18-5   Solvent
Sodium Carbonate        497-19-8    Active Ingredient
Trisodium Phosphate     7601-54-9   Builder
Alkali Metal Carbonate  Withheld    Builder

Google says the alkali metal carbonates are Li2CO3, Na2CO3i and K2CO3 but returns nothing useful about other terms.

What do the parts not in plain English mean: "Cas #", "Builder", and "Withheld"?

  • 2
    – nobody
    Nov 20 '21 at 13:53
  • 2
    Withheld is "plain English" for "we're not telling you the CAS number"
    – Ecnerwal
    Nov 20 '21 at 14:08
  • 2
    Withheld is also used so you don't make the same thing for 10% of the cost.
    – crip659
    Nov 20 '21 at 17:05
  • 1
    Sodium carbonate already being listed above, it's either lithium carbonate or potassium carbonate or perhaps both.
    – Ecnerwal
    Nov 20 '21 at 17:19

Cas number:

Each CAS Registry Number® (CAS RN®) identifier:

Is a unique numeric identifier Designates only one substance Has no chemical significance Is a link to a wealth of information about a specific chemical substance

I would guess "Builders" are to give body to the product.

"Withheld" is to protect their brand because they think whatever they are using makes their stuff special and it is a reasonable thing that they don't want to get copied.

I am interested that "sodium carbonate" is the active ingredient. So mold control by lowering pH via washing soda? I hope you are not paying a whole lot for this stuff. You can buy a big box of dry washing soda for $5 and skip paying for water.

  • What does "give body to the product" mean? Do you have reason to believe that a solution of sodium carbonate in water alone would work? Nov 20 '21 at 20:25
  • I figured "builder" gave the stuff some substance so it looks like there is more to it than clear water. I was surprised that sodium carbonate is used as an antifungal but it makes sense that a strong base would kill things. As regards a solution of sodium carbonate in water it looks like that is what this is: 1% sodium carbonate. AT $10/quart on Amazon.
    – Willk
    Nov 21 '21 at 4:01

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