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Thread: woven vs. knitted fabrics
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10-04-2004, 11:22 AM #1
woven vs. knitted fabrics
There seems to be a small price difference between woven (6 - 12 oz. cloth, not woven roving) and knitted fabrics.
I hear about the superior strength (non crimped fibers and higher glass to resin ratio) but what are the downsides? Is wet out, air bubbles, etc. more of an issue?
I'm replacing some stringers and the transom so I've got some 1/2" radiuses to cover - does the knit not drape as well as woven?
Any preferred suppliers of fabrics? I've been looking at www.fiberglasssupply.com , are there prices alright?
Thanks,
--TimThe house needs painting, ... how about a project that'll give me a smile 20 years from now?
'75 Tahiti, 351W I/O
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10-04-2004, 11:32 AM #2
Tim,
Woven fabrics (woven roving, etc.) have large voids, which create pockets of resin and air. The result is a heavier layup. Knitted fabrics (bi and tri-directionsl layups), do not have these voids, and the multidirectional pattern creates a very strong, light laminate. Knitted fabrics are the way to go.
Greg
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10-04-2004, 11:34 AM #3
Here is the difference (taken from Progression's website)
Woven Roving (which they do not use)
Tri-Directional Fabric:
Greg
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10-04-2004, 11:42 AM #4
Tim,
Off subject, but I used to live in "little" Duluth, still only one stoplight?JOHN MASON
'83/VECTOR/MERC 200-- SOLD
'98 Quartershot T-3/ MERC 200
"If your not living on the edge, your taking up to much space"
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10-04-2004, 08:41 PM #5
Thanks for the info, Greg (Progression has a nice site) -- I'm guessing I just buy some knitted stuff and test out how it cuts, lays, wets out, etc. -- I just came across someone mentioning a concern about a potential "drain out" issue that woven's don't have.
WW,
I don't acutally live within the city of Duluth (I'm not sure what your question is, are you asking about the historic city of Duluth?)
--TimThe house needs painting, ... how about a project that'll give me a smile 20 years from now?
'75 Tahiti, 351W I/O
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03-07-2005, 02:25 PM #6
Yes, I was asking about downtown Duluth, I lived just north of the only stoplight in town, (at the time)
JOHN MASON
'83/VECTOR/MERC 200-- SOLD
'98 Quartershot T-3/ MERC 200
"If your not living on the edge, your taking up to much space"
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03-07-2005, 04:36 PM #75000 RPM
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Jim
Yes, I would most deffinetly use the knitted stuff. Working with the knitted is "cadillac" comapred to the woven roving, or continuos stand matting. When you go to do your lay up, have a bench cleared off, and lay down some thick plastic, (I used vapor barrier) and lay yur cut peices of knitted material, and wet it out on the bench, (make sure you flip it over after on side is all wet out, and wet out the other side if there are any area's that didn't get wet out) then after the peice is wet out, pick it up off the plastic, and bring it to the boat, and start laying it up. This method works pretty good, as far as working with the materials.
Wanna Play?
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03-07-2005, 09:19 PM #85000 RPM
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1708 1808
I won't even touch woven roving and mat again after using 1708 and 1808. Knitted is much easier to work with and really minimizes the mess.
try www.uscomposites.com
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03-07-2005, 11:31 PM #9
all my stringers are layed up with tri-axial, and I wouldnt have it any other way... due to the smaller fibers (but higher count, and pattern) it even lays around corners a little better than woven roven. 350cavi makes a good point on how to wet it out, that makes it a snap.
> Stainless steel Merc cowling plates - $110 shipped TYD - LINK <
1979 16' Action Marine/2.5L Merc S3000 - Metalflake Maniac
1984 18' Contender Tunnel/2.4 Merc Bridgeport
"Where does the love of God go, when the waves turn the minutes to hours?"
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03-08-2005, 01:21 PM #105000 RPM
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Jim
OHH, and also before you lay any glass down, be sure to prime all the "soon to be glassed areas" with resin, take your brush and paint it on like you were painting, this gives you extra assurance that you are getting proper bond. And I hope that you were planning on using Vynil Ester resin, as that resin has way better bond rate than the Iso and or the regular waxed resin. Hope this project goes well for you.
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03-08-2005, 04:52 PM #11
yeah, unfortunately ive done enough glass work to know all about priming the surface before i lay the glass. I should start a business (NOT)
> Stainless steel Merc cowling plates - $110 shipped TYD - LINK <
1979 16' Action Marine/2.5L Merc S3000 - Metalflake Maniac
1984 18' Contender Tunnel/2.4 Merc Bridgeport
"Where does the love of God go, when the waves turn the minutes to hours?"
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04-01-2005, 04:33 AM #12Junior Member
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You can overcome resin drainage simply by using quality resin systems
Originally Posted by Tahiti_Tim