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Post by nikeajax on Jun 30, 2022 8:20:55 GMT -8
PY, that is how they were/are colored, I think the clay was part of a matrix for suspending the color. The reason why tires are black is because they add carbon-black to them, this was/is to give the latex considerably greater strength. WAAAAAAAAAAY back in the 1900's cars had light colored tires: and bicycle tires could come in an assortment of colors, red, white, blue, yellow, green. JB
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Post by vance on Jun 30, 2022 14:41:30 GMT -8
I have internet knowledge (!!!) that says clay based hoses rotted far faster than other-based (?) hoses. IDK. Anyone?
Lasting hoses can and have been done: I've had hoses that are 70 years old and still flexible, pliable, and crack, split, and set-free. I've seen other very old hoses that are stiff, slighty set, but intact.
I've also seen 20 year old hoses that are gooey, splitty, broken, stiff, terribly convoluted, and unusable garbage.
WTH?
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Post by nikeajax on Jun 30, 2022 16:39:00 GMT -8
Ozone melts/damages rubber, right? I've seen stuff that has been in storage for decades, not just dive gear, but vinyl coated too that has melted into a sticky coating: as far as I know, there has been no electrical arcing anywhere near these things. Perhaps it has something to do with the off-gassing? OK, I'm just putting this out there, but it sorta makes sense When you have two different metals they create an electrical current, or electrolysis. What if... it's the chrome/nickle-plating that is creating ozone and causing the oxidation? For instance, what caused my dive mask to get all melty like an old cheeseburger when it sat in a box for 30-years? As Beau likes to say, "Anyway, it's just a thought..." JB
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Post by cnotthoff on Jun 30, 2022 17:09:43 GMT -8
Ozone melts/damages rubber, right? I've seen stuff that has been in storage for decades, not just dive gear, but vinyl coated too that has melted into a sticky coating: as far as I know, there has been no electrical arcing anywhere near these things. Perhaps it has something to do with the off-gassing? OK, I'm just putting this out there, but it sorta makes sense When you have two different metals they create an electrical current, or electrolysis. What if... it's the chrome/nickle-plating that is creating ozone and causing the oxidation? For instance, what caused my dive mask to get all melty like an old cheeseburger when it sat in a box for 30-years? As Beau likes to say, "Anyway, it's just a thought..." JB Gotta agree with Jay. I live in Humboldt County where the air is pretty clean. One of our dive buddies lived in LA where the air is less pure. We purchased drysuits with latex seals at the same time. We both cared for our suits the same way. Every time we arranged to meet in Monterey for some diving, he would have to install new seals, since the old ones had gone gummy. Mine outlasted his 3 to 1. I don't want to think about breathing that stuff. Good Dives, Charlie
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Post by SeaRat on Jun 30, 2022 18:00:43 GMT -8
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Post by antique diver on Jul 1, 2022 7:39:13 GMT -8
Just for comparison of conditions... I have a DUI drysuit made in 2001, but it hasn't seen much use since 2008. Original latex wrist and neck seals are still intact, but I can tell that they are just beginning to seem weak. I never thought they would last this long, and if I'm careful I think I can still use it... but will have a Hydroglove backup with me just in case.
I have always stored the suit indoors where it doesn't get hot, in its own original zippered bag. After every use I have generously dusted the seals with cornstarch. (Do not use baby powder type products). For several years it was stored in a working extra refrigerator, but eventually needed that appliance for other objects. Now it's back in air conditioned room.
The same storage conditions have kept my latex Hydroglove suit in good condition for over 6 years. Hoping it will continue to last. Recently have begun storing it in a refrigerator, but not sure if that's good or bad for it.
Anyone think that the cold storage could be detrimental?
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Post by nikeajax on Jul 1, 2022 8:38:07 GMT -8
"Rubber that gets regular use will retain its flexibility and molecular properties longer than neglected rubber. For example, although they’re exposed to UV rays daily, the tires on the car you drive regularly are actually more resistant to rot than tires hidden away in a dark garage. During the manufacturing process, the tire-maker adds a protective compound to the rubber formulation. Regular use causes the tire to flex and compress, pushing this protective substance to the surface. This doesn’t happen in an unused tire, so the rubber is more vulnerable to damage from ozone and oxidation.
Lack of use, exposure to extremely high or low temperatures, or prolonged exposure to UV radiation can all cause rubber’s molecular chains to break down over time — and time itself is a factor, too. Rubber is one polymer that just doesn’t last forever, and its descent into decay begins the moment it’s manufactured."
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Post by vance on Jul 1, 2022 18:13:09 GMT -8
Some rubber's "...descent into decay..." is dependent on its composition.
What is it that allows a 70 year old hose or duckbill to retain full flexibility, no set, no goo, and no crack suppleness, while another hose or duckbill is a gooey, splitty, set, cracked, and dried out mess in 10 years?
There has to be a chemically formulaic answer.
That's alls I'm sayin'.
Of course, silicone rubber solves the problem.
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Post by SeaRat on Jul 1, 2022 22:38:43 GMT -8
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Post by nikeajax on Jul 26, 2022 7:45:37 GMT -8
Yesterday I looked in my junk-drawer and discovered that one of the rubber bands I had in there had melted itself to the positive terminal of one of the batteries I had in there to recycle: the battery was for all intents and purposes, dead, and none of the other rubber bands was melted. Hmmmm? I just thought I'd mention it...
JB
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Post by SeaRat on Jul 26, 2022 15:15:13 GMT -8
Yesterday I looked in my junk-drawer and discovered that one of the rubber bands I had in there had melted itself to the positive terminal of one of the batteries I had in there to recycle: the battery was for all intents and purposes, dead, and none of the other rubber bands was melted. Hmmmm? I just thought I'd mention it... JB The battery wasn’t dead, just discharged enough that it could not function anymore where you had it. There is still a charge on it. John
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Post by Aquala1 on Aug 16, 2022 17:51:53 GMT -8
One of my DA Aquamasters still wears it's original "High Convolution" "Super Stretch" hoses. They are still in good shape and are 60 +/- years old Can you post a pic of the hoses? If I’m not mistaken, those were only offered in the 1961 catalog.
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