Dark Boards.....Too Hot?

[dllee]

Hi BEN!

It appears some of us are confusing pressure differences with heat, and it's effect on epoxy sailboards.
And I doubt any surfboard can have more volume than a sailboard.

Keep pressure (altitude) and temperature (heating and cooling) from affecting your boards. I use no board bags, have had very few delam problems after 33 years of shortboarding and owning WAAY more than 100 sailboards.
Ok, maybe closer to 150 sailboards, sorry.

[swchandler]

At better than 4 boards a year, maybe you didn't have them long enough to experience any problems. Still though, that's quite a turnover rate. Why so many?

[isobars]

[alap]

Dan, I understand the physics of membrane.
The molecule of sweat/vapor is getting out. The molecule of water doesn't go in. Just because of the size of micro holes.

Your theory that as membrane got old the vapor can't escape, it is not confirmed by my "experiment". In the old jacket no matter how hard I work, unless it is raining, I feel perfectly dry. Its getting wet only when it really rains.

And actually when this happened I was not working hard at all... Just on the lift...

Sorry, to me it is not that the vapor is not escaping any more, but that it is water getting in.

And if this happens to the jacket it certainly could happen to the vent, could it?

[GURGLETROUSERS]

Agree with alap.

Well used board with well used Goretex vent. Board heated and vented by sun on journey to coast. Board plunged into colder water creating lower pressure interior and suction while board and vent awash in water.

Probable result, some water sucked in through overstrained and deteriorating membrane, to equalise outer and inner pressures.

Why risk it, when a sound screwed vent plug is safe.

[isobars]

[DanWeiss]

OK, I did some research including speaking to a chemist who researched Gore-Tex and other "waterproof, breathable" fabrics. She said what I and most people believe about the way moisture on the inside of such a garment is eliminated, namely through transfer of water vapor through the "magic" layer is wrong. Speaking of Gore-Tex, she indicated that the early days of Gore Tex proved troubling for the company because the single PTFE layer became clogged with dirt, oil, sunscreen etc. "Modern" Gore-Tex (not including Gore-Tex Pro for some reason) uses a very thin layer of polyurethane laminated directly to the PTFE substrate.

She explained that water vapor cannot pass through the tiny holes in modern Gore-Tex since the PU layer is monolithic. Yet the PU layer also is hydrophilic. This is the key, she said. Water vapor condenses on this PU layer and sits there until it reaches a condensation gradient sufficient to diffuse through the PU and emerge on the interface between the internal PU and the PTFE laminated to the outside. It re-vaporizes at this interface where the vapor now can pass through the PTFE layer, but only if a sufficient heat/humidity gradient exists.

That is why Gore-Tex clothing does not work the same in all conditions. For example, Gore-Tex doesn't work particularly well in hot and humid conditions. It works best in warm and dry conditions. Cold and wet conditions also allow Gore-Tex to work well.

She said that the reason people love Gore-Tex over most other similar products is because Gore-Tex is both highly breathable, nearly waterproof, and almost totally windproof. No other product does all that except for something called eVent. eVent uses a different type of PTFE than Gore, a type that resists oils and dirt. Since eVent needs no PU to keep it clean, it must be laminated to cloth to prevent abrasion but is a heavier fabric as a result and not wind proof.

[bamer]

[isobars]

[alap]

bamer, such a long thesis on something so simple....

If I offended you, I am so sorry, you took it so personally, I had no intention.
And believe me unfortunately I know what Alzheimer is. No reason to loose sense of humor, my politically correct friend.

And when I say "they" I didn't meant to say that it is produced by goretex. Just they, the shops... Please do not sue me for defamation.

And nobody should convince me that goretex is good, expensive but good, everything I wear when ski is goretex, (except of gloves, gloves are leather, goretex gloves are ruined too fast), not some "proprietary" membrane, which has no comparison to goretex really.

And yes unfortunately I have the bad experience of keeping my first board in the freezing temperatures... yes it was llong ago... 30 years... but it was the end of it.

but I won't keep nothing that has taken or might have taken water in the freezing temps... Like my quick blade paddle got a bit of water inside... I can hear it if I rotate it fast enough. I am too lazy to change the handle but if I let it stay, there is a danger it will be destroyed... or may be not...
So in the winter it lives in my cold room, together with my boards and carbon booms (and yes if I have to carry seven of those I dont mind to bring as well my carbon masts in). Sails live in the trailer though...

but why risk it? same is with goretex vent - why risk it? because it is cool?

if you happy with goretex vents or keeping the boards in the sun or below freezing - by all means, I personally won't do that...