The quantity of epoxy, polyester laminating resin, or polyester finishing resin needed to completely wet out fiberglass reinforcement fabric is dependent on the weight of the fiberglass cloth.
Fiberglass chopped strand mat (CSM) is rated in ounces per square foot. To saturate it, you'll need an amount of resin that's two times the weight of the mat.
- Example: 1.5 oz. of CSM needs 3 oz. of resin per square foot.
Fiberglass cloth is rated in ounces per square yard. One gallon of resin will wet out 60 oz. of fiberglass cloth.
- Examples:
- 4 oz. fiberglass cloth - Takes 1 gallon of resin to wet out 15 square yards
- 6 oz. fiberglass cloth - Takes 1 gallon of resin to wet out 10 square yards
- 10 oz, fiberglass cloth - Takes 1 gallon of resin to wet out 6.5 square yards
Biaxial fiberglass cloth is rated in ounces per square yard and requires 3 times its weight in resin.
- Example: The weight of 1708 biaxial fiberglass cloth is 17 ounces per square yard. It takes 51 ounces of resin, per square yard, to saturate it.
Comments
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I'm new to this, but I believe the reference here to 1708 weighing 17 oz/sq yd is incorrect. 17 is only 1 layer, biaxial has 2 layers, the other is 08oz, together they weigh 25oz/sq yd. It may be the calculation for the amount of resin needed is correct, but I think that can only be calculated based on the density of the resin, ie how much does 1 gallon of the resin being used weigh? If I'm not mistaken, the formula for 1708 wetout is 1.5 x weight of cloth=weight of resin (not volume of the resin) needed to saturate it (we can't use volume oz, we must use weight oz to calculate the resin needed, ie the math is not 128 oz per gallon). Each resin will have a weight per gallon based on the density of the material. If we use the TB spec for 5:1 epoxy, 6.4 sq yds 1708 per gallon of resin, that is 6.4x25oz=160oz of fabric weight, or 10lbs/gallon, which tells us 1 gallon mixed must weigh 15lbs. Can you clarify the above reference to 1708 and the amount of resin (which resin) to wet it out properly?
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