westes

Weight of Perlite Versus Pumice

Does anyone have data on the actual weight of perlite versus pumice, for a given volume?

Comments (10)

  • cactusmcharris, interior BC Z4/5

    Only WAGs, no actual calculated data. IME, pumice would be slightly heavier but almost infinitely superior in use.

    westes Zone 9a California SF Bay thanked cactusmcharris, interior BC Z4/5
  • Karen S. (7b, NYC)

    No, I just use them almost interchangeably, Perlite w/ Houseplants & Tropicals, Pumice w/ Succulents.

    Why would you need that info? Could I pls ask what you're planning?

    westes Zone 9a California SF Bay thanked Karen S. (7b, NYC)
  • gardengal48 (PNW Z8/9)

    Perlite = ~ 5-8 lb/cubic foot (fully expanded)

    Pumice = 40 lb/cubic foot

    westes Zone 9a California SF Bay thanked gardengal48 (PNW Z8/9)
  • Rob Blomquist

    I can believe gardengal's numbers. I think pumice is a whole lot heavier.

    westes Zone 9a California SF Bay thanked Rob Blomquist
  • gardengal48 (PNW Z8/9)

    Pretty darn easy to verify :-)

    westes Zone 9a California SF Bay thanked gardengal48 (PNW Z8/9)
  • cactusmcharris, interior BC Z4/5

    I never used perlite when I had pumice to use. Now that I don't have access to easy pumice, even though there's a mountain of it in the province (don't get me started), I still don't use perlite. It's not a good thing if you have access to better things, but if it's the only thing, it'll do.

    westes Zone 9a California SF Bay thanked cactusmcharris, interior BC Z4/5
  • westes Zone 9a California SF Bay

    @KarenS I am talking to a soil manufacturer who uses perlite in their mix, and I am trying to convince them to use pumice instead. The perlite floats to the top and makes a mess. They objected that pumice is too heavy.

  • westes Zone 9a California SF Bay

    @gardengal48 (PNW Z8/9) You came through for me on this question. Thanks!

    Unfortunately, your answer confirms the fact that pumice is much much heavier. I am dealing with a soil manufacturer who wants to save weight. Since weight and transport cost is most of the cost of the product for a soil product, that's a non-trivial issue.

  • Karen S. (7b, NYC)

    Thanks for explaining. I've never had the Perlite floating issue, but I only grow Indoors & I mix my components REALLY well.

    Sure I can see why it would matter to them, absolutely.

    westes Zone 9a California SF Bay thanked Karen S. (7b, NYC)
  • cactusmcharris, interior BC Z4/5

    Shoveling cheap pumice was a special joy, now that ya'll mention it.

    westes Zone 9a California SF Bay thanked cactusmcharris, interior BC Z4/5

Need help with an existing Houzz order? Call 1-800-368-4268