Currently using the Lohr recommend glassing schedule on EPS boards. I would like to retain more of the EPS lightness by changing from 6 oz E glass to 4 oz S and get some superlight, yet durable boards. People say S has 1/3rd more strength - so the basic math works but putting that in practice may be a different story. Anyone? Many Thanks
Hate to tell you to have a looksee in the archives, but there are at least a few threads detailing the diffrences.
But put it to you this way:
S cloth is at least double the price of E cloth for lperhaps a slight gain in structural strength and weight savings would be barely noticeable.
Drew
Have used S in sailboards/surfboards on Clark – but more interested in use on EPS/Epoxy. Not sure this has been covered.
S glass does have 1/3 more strenght than E glass. Beyond the strenght aspects I look that the thickness of the cloth. I have found that you can have 3 layers of 4oz compared to 2 layers of 6 oz and have higher strength with the 4oz layup over the 6 oz layup. Look that the www.hexcel.com web site at the Fabric data sheets. http://www.hexcel.com/Products/Downloads/ Do the math to achieve a thiner layup (less resin, less weight) with more strength. I have used 6oz S and 4 oz E to save money on the same board. You need to be a good glasser to achieve better results.
Anthony
I’ve moved to impact glass sold by graphite masters and have been very happy with it. The glass has a very tight weave and it requires significantly less resin to wet it out.
Quote:
Have used S in sailboards/surfboards on Clark – but more interested in use on EPS/Epoxy. Not sure this has been covered.
it has…extensively
the only real difference between S and E (aside from the price) is that S-glass has better memory. this increases impact strength, but doesn’t have as noticeable an effect on tensile strength.
dan. how dare you ues a non surfboard spacific material on a surfboard!!! what about tradation? i mean a different faom, a different resin and now a different glass??? thats just not how you do it. do you have a link so i can check it out?
soul man… are you sure about your post?
No, you got me all wrong! The only reason I use these materials is to piss Chip off (or to at least bore him to death) 
I posted about this awhile ago and the answer I got from G Loehr was that the actual strength gain was more like 5%. However I found a supplier whose s-glass was not much more than e-glass so I went ahead anyways. 5% stronger is stronger. One note= s-glass does show more of the weave. I used tints so it didn’t matter much.
Try- www.shopmaninc.com
Anthony – hexcel.com looks like the place to find the right info. By chance, do you recall the “style” numbers for 4 oz S and 6 oz E?
Many Thanks!
Quote:
soul man… are you sure about your post?
yeah…i started a thread asking about the differences between glass awhile back. didn’t really get a straight or consistent answer on sways. talked about it a bit with greg loehr on the phone. then talked about it much more extensively with the guy from Fiberglass Supply. we talked about different types of glass (e, s, and k) and also different brands and their respective quality. wish i had a transcript of our conversation to enshrine in the archives for eternity.
Fiberglass Supply has the Style Numbers on there web site. See the glass section.
Anthony
After reviewing the data, S is clearly stronger but the different measures give different numbers. So, an engineer would need to sort this out. But, S does have a reported 33% increase over E for tensile strength. However, hexel shows the S “thread breaking strength” as only about 8% better. Then a host of flex, hex to convex numbers in between. Not knowing if the function of the hexel number, linier, etc. - that number puts up a question mark. None the less, its good to find some real numbers to start applying to this question.