Fabric Weights

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Fabric Weights

Author	Message
Junior	Junior posted 8 Years Ago HOT Topic Details
Group: Forum Members Posts: 73, Visits: 473	I'm a little confused with something and wondered if someone could enlighten me... The recommended ratio of resin to fabric for fibreglass and Carbon Fibre appears to be the same i.e. 200g of resin for 200g of fabric, so when people say the same product made in carbon would weigh less as it requires less resin, how can this be?
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Warren (Staff)	Warren (Staff) posted 8 Years Ago HOT Post Details
Group: Administrators Posts: 2.5K, Visits: 8.5K	There is a very slight difference but in practice that weight rule works. However what it doesn't tell you is that to compare "like for like" you would need more layers of fibreglass and hence more resin to make your fibreglass part as stiff as the carbon fibre part so that is where the weight saving comes in. Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
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Junior	Junior posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 73, Visits: 473	I thought that could be the case, it's just that the samples I made with similar weight fabrics felt the same with very similar properties. Maybe it was because they were fairly small?
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Fasta	Fasta posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 468, Visits: 3.5K	200g fglass is thinner but heavier being glass 200g carbon is a lighter material will appear thicker than the glass using just as much resin in the end. With carbon you either use less of it to make a lighter product or use the same laminate weight to make a much stronger product. Fastacraft Facebook page
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Junior	Junior posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 73, Visits: 473	The lay-up i'm thinking of using consists of 2x600g biaxial fibreglass sandwiched between single layers of 180g Carbon/Kevlar Aramid. At a rough estimate, if I were to replace the fibreglass with Biaxial Carbon fibre, what weight fabric could i get away with to give a similar strength to the 600g biaxial fibreglass? I was wondering whether 2x300g biaxial carbon fibre would be similar?
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Fasta	Fasta posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 468, Visits: 3.5K	Without getting into composite engineering calculations which is not my thing I do it like this. Measure the thickness of your current mixed laminate part. eg 4mm 4mm in all carbon using a vacuum compaction process like infusion or pre preg is equal to 4000g of carbon. An equal thickness like this with all carbon is of course going to be stronger than your mixed laminate version. To make an equivalent strength for me is just estimation so something less than 4000g of carbon is what you need. Make a part or a sample using 1-2 less layers of carbon and then see how it feels. Estimation/trial and error/hands on Fastacraft Facebook page
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