Thermal Compound, calculating amount of hardener and resin by weight

  1. I have a simple question. If when mixing two liquids together the directions say mix 10.4 parts of hardner by weight for every 100 parts of resin and I want the final mixture to be 2.75lb, could I do the following?

    Mh = mass of hardener
    Mr = mass of resin

    Mh + Mr = 2.75lb

    Mh/Mr = 10.4/100 = .104

    Then just solve from there to get the amount of each. I know this should be pretty straight forward but I just wantedto double check. Thanks in advance.
     
  2. jcsd
  3. Chestermiller

    Staff: Mentor

    This looks OK.

    Chet
     
  4. lay these things right out

    I always like to lay these things right out as percentages:

    You need 9.42% hardener, and need 90.58% resin.

    10.4/(100+10.4) = 0.0942
    100/(100+10.4) = 0.9058

    Mh 0.0942 x 2.75 = 0.259
    Mr 0.9058 x 2.75 = 2.491

    check1: 0.259 + 2.491 = 2.75
    check2: 0.259/2.75 = 0.0942 = 9.42%
     
    Last edited: Jun 9, 2014
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