Glass cloth weight conversion table

Discussion in 'Materials' started by Landlubber, Jul 25, 2007.

  1. Landlubber
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    Landlubber Senior Member

    Hi folks, could some kind soul please direct me to a table that shows fibreglass cloths, rovings etc as a conversion from Imperial to Metric. I have done numerous Google searches but never came up with such a table. Specifically, items such as CSM in 1oz to gram equivalents, woven rovings in say 800grams back to (24oz) imperial sizes. Thanks.
     
  2. gary1
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    gary1 Senior Member

  3. Landlubber
    Joined: Jun 2007
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    Landlubber Senior Member

    Cloth weights

    Sorry Gary , it is not that simple. It depends on whether it is CSM, rovings etc, I have asked the local supplier and he is even confused. Thanks anyhow
     
  4. tuantom
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    tuantom Senior Member

    From what I've heard; CSM is weight per square foot (0.0929 m^2) and all others fabrics are per square yard (0.837 m^2).
     
  5. SamSam
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    SamSam Senior Member

    In the U.S. it's as tuantom says, CSM weighs so much per square foot and all other fabrics weigh so much per square yard. So, 1 ounce CSM weighs the same as 9 ounce cloth since there is 9 sq. feet in 1 sq. yard. 2 ounce CSM would weigh the same as 18 ounce woven roven.
    I'm not sure what you are doing, but the site below will convert metric to imperial and vice versa. Here's how they put it...

    http://www.onlineconversion.com/
     
  6. Landlubber
    Joined: Jun 2007
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    Landlubber Senior Member

    My own table

    Fibreglass clothweights and resin ratios etc.

    CSM is weight per square foot (0.0929 m^2) and all others fabrics are per square yard (0.8361 m^2).

    To convert ounces to grams x by 28.349523
    To convert feet to meters x by 0.3048
    To convert square feet to sq metres x by 0.0929
    To convert square yards to sq metres x by 0.8361
    To convert square meters to sq feet x by 10.76
    To convert square meters to sq yards x by 1.196
    To convert square yards to sq metres x by 0.8361

    To convert gallons (US) to litres x by 3.785
    To convert litres to gallons (U.S. liq.) x by 0.2642

    Chopped strand mat:
    The general rule for chopped stand mat is 1.5 to two times the weight in resin to the weight of mat. So one pound of chopped mat would take two pounds of resin. One square yard of 1.5 ounce chopped strand mat weight 13.5 ounces so it would take 1 pound 11 ounces by weight of resin to wet it out. Our mat is 50 inches wide. One linear yard of 1.5 ounce weighs 18 ounces so it would soak up 2 pounds 4 ounce of resin by weight.
    ¾ oz csm=228g (200)
    1 oz csm=284g (300)
    11/2 oz csm=457g (450)
    2 oz csm=610g (600)

    Here is a helpful table for cloth:

    1.5 ounce cloth (50g)……..1 gallon (3.785 litres) wets out 40 square yards (33.45 M2)
    2.5 ounce cloth (85g)……...1 gallon (3.785 litres) wets out 25 square yards (21 M2)
    4 ounce cloth (135g)………1 gallon (3.785 litres) wets out 15 square yards (12.5 M2)
    6 ounce cloth (200g)………1 gallon (3.785 litres) wets out 10 square yards (8.36 M2)
    10 ounce cloth (340g)……..1 gallon (3.785 litres) wets out 6.5 square yards (4.4 M2)

    18 ounce woven roving (610g) …1 gallon (3.785 litres) wets out 4.5 sq yards (3.75 M2)

    24 ounce woven roving (813g) …1 gallon (3.785 litres) wets out 3.5 sq yards. (2.9 M2)

    Please remember several things:

    - these are estimates not hard and fast rules.

    - if you are laminating over wood, the raw wood will soak up some resin, which is good, but you will use more resin on the first layer.

    - thin resin goes farther than thick resin.
    This is from a table I found elsewhere, just added the relevant extras to become metris as well as Imperial, hope this helps someone else one day.
    Thanks for those that gave input.
     
  7. kach22i
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    kach22i Architect

    http://www.nextcraft.com/vacuum_bagging_01.html
    [​IMG]
    What kind of difference would vacuum bagging make to the table?
     
  8. Landlubber
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    Landlubber Senior Member

    You would use less resin!
     

  9. Rip
    Joined: Feb 2005
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    Rip New Member

    Simple conversion:

    1 oz/square yard = 33.9 grams/square meter

    So:
    3 oz cloth = 102 gsm
    6 oz cloth = 203 gsm
     
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