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PostPosted: February 19th, 2005, 2:09 pm 
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Location: London, Ontario, Canada
Other than 2 oz. what are the differences between the 4 & 6 oz. fiberglass cloth?

Which is one is the tighter weave?
Which one takes more epoxy?
I assume that the 6 oz. cloth is denser and thus stronger?

Any websites out there concerning this?


Thanks,
Doug

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PostPosted: February 19th, 2005, 4:29 pm 
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Location: Toronto, Ontario Canada
Ask an expert...Smithcraft Fibreglass Supply Centre (Toronto)

http://webhome.idirect.com/~edd/smith.html

Website has a lot of dead links but you could call them. Don't really know how "expert" they are but when I asked "how much epoxy do I need for this strip of Kevlar on the bottom of my canoe" the answer was...."This much" and they were EXACTLY right.

My second question was "is this epoxy as good as that stuff which costs a lot more" the answer was "it's the same stuff except for the labels" Too early to tell if he was right but it seems to be holding well.

Ben

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PostPosted: February 20th, 2005, 6:56 am 
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For a good discussion on cloth etc. check out

http://www.johnrsweet.com/Fabric.html

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PostPosted: February 21st, 2005, 12:20 pm 
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Location: Mounds View, Minnesota US
And after you read the stuff on Sweet's site John links to.

Do some searches for fiberglass and Hexcel and BGF.

Hexcel and BGF appear to be the to "biggies" in the glass fiber/weaving business. They both have specification down loads that will allow you to compare different fibers and weaves.

In general, there are a large number of different weaves and cloths, for example, you might find 5 or 6 patterns all around 6 oz/yd, and all with different strengths.

Without knowing the weave pattern/model number, it's hard to tell much of anything about a given cloth. Note that Hexcel and BGF in general use a different numbering system for their weave patterns, though some are the same.

Dan


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PostPosted: February 21st, 2005, 12:30 pm 
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http://www.compositescanada.com has a lot of good info,


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PostPosted: February 21st, 2005, 1:04 pm 
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Location: Mapping Wabakimi PP!
http://www.bearmountainboats.com/

Some here will be able to give you some answers since everyone is either in the process or has built many canoes.

I have only used 6 oz both inside and out. If I were to do it again, 6oz on the outside and 3 oz on the inside.

Boneli

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PostPosted: March 5th, 2005, 7:51 am 
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Location: London, Ontario, Canada
If my upcoming Osprey is 47 square feet ( http://www.greenval.com/weight.html ).
What would the weight difference be between, glassing it in 4 vs. 6 oz cloth?

When it refers to the weight in oz., what is it a measurement of?
a square inch?

Thanks,
Doug

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PostPosted: March 5th, 2005, 8:48 am 
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the weight referrs to sq yard.But that doesn't include the resin. It takes less resin to wet out and fill 4 oz.

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PostPosted: March 14th, 2005, 8:42 pm 
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It is pretty close if you just double the cloth weight. So 4 ounce needs 8 ounces/square foot, inside and out. 8 oz being the glass and resin combined total.


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PostPosted: March 15th, 2005, 7:55 am 
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Location: Kitchener, Ontario Canada
PeterPan said:

Quote:
It is pretty close if you just double the cloth weight. So 4 ounce needs 8 ounces/square foot, inside and out. 8 oz being the glass and resin combined total.


I presume you meant per square yard, otherwise the Osprey with 4 oz cloth would weigh in at about 47lbs for the glass and epoxy alone. My BobSpecial came in at 46lbs with 6 oz and ash gunwales and seats

cheers

moe.


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