 Dow Corning 730, a warning... |
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| McMark |
 Dec 2 2004, 12:29 PM
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#1
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914 Freak!  Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None  |
I was just doing some research on Dow Corning 730 sealant. Looks like it's not supposed to be used on Magnesium because of the acid it produces during curing. We have Magnesium tranny cases, right? (IMG:style_emoticons/default/idea.gif)
Here's a supplier for the stuff, BTW. I've never bought from them (yet), but it's the only one I could find online. |
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| Sammy |
Dec 2 2004, 12:53 PM
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#2
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. Group: Members Posts: 1,190 Joined: 21-January 03 From: Orange, Ca Member No.: 178 |
Dow Corning 730 sealant uses acetic acid as a curing agent. Basically it prevents the curing of the sealant. as soon as the acetic acid evapirates the product cures kid of like a reverse catalyst.
BUT... so does almost every RTV product on the market. Is it a problem? No, IMO it is not. It may cause some discoloration around the joint. It may cause some etching at the surface, but not enough to measure. This is taken off the manufaturer's product sheet: (do not use) • On or near sensitive metals such as copper, brass, zinc, carbon steel, galvanized iron or magnesium; these metals may be corroded, especially in confined cure conditions, due to the acetic acid released during the cure. So, you can't even use it on steel? I don't buy it, I've used it and many other RTV products on steel with no problems. As soon as the acid evaporates the potential problem goes away. RTV does not eat up parts. If you have a polished transmission case you might want to protect it from the fumes with some tape, otherwise don't worry about it. BTW McMaster Carr www.mcmaster.com sells it, part #74925A65, 3-oz. tube for $67.45 Very good stuff but very expensive. Good ole rtv will prolly work as well ofr lots less $$$$ |
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| Eric_Shea |
Dec 2 2004, 01:00 PM
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#3
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PMB Performance Group: Admin Posts: 19,275 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains  |
Hellllllllllllllooooooooooooo. Calling Capt'n Krusty (IMG:style_emoticons/default/laugh.gif)
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| Sammy |
Dec 2 2004, 01:04 PM
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#4
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. Group: Members Posts: 1,190 Joined: 21-January 03 From: Orange, Ca Member No.: 178 |
LOL, Eric I was thinking the same thing, brought back memories of threads about RTV on engines and the dangers of SS brake lines (IMG:style_emoticons/default/wink.gif)
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| Brad Roberts |
Dec 2 2004, 02:22 PM
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#5
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
Talk to Jerry Woods. He used it on ALL the mag engine cases with no issue in over 30 years.
B |
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| Trekkor |
Dec 2 2004, 02:29 PM
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#6
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I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
i think it's some legal cover...
Just like, "Warning- hot coffee may be hot", on every cup, because some clown dumped piping hot on his crotch and sued somebody because it was hot. (IMG:style_emoticons/default/cool_shades.gif) KT (IMG:style_emoticons/default/lol2.gif) |
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| SLITS |
Dec 2 2004, 04:50 PM
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#7
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
QUOTE(trekkor @ Dec 2 2004, 01:29 PM) i think it's some legal cover... Just like, "Warning- hot coffee may be hot", on every cup, because some clown dumped piping hot on his crotch and sued somebody because it was hot. (IMG:style_emoticons/default/cool_shades.gif) KT (IMG:style_emoticons/default/lol2.gif) It was an old clowness, that dumped it in her lap and sued MikeyD. Won too! *&^*(%$%*)*& lawyers!!!!! |
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| Ctrout |
Dec 2 2004, 08:08 PM
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#8
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Member Group: Members Posts: 377 Joined: 20-May 04 From: Mountain Home, ID. Member No.: 2,091 |
I'm in the USAF and we are anal about safety. We have an MSDS for almost everything. The MSDS for the hand soap that my unit uses actually recommends the use of latex gloves when using the product. Go figure. (IMG:style_emoticons/default/slap.gif)
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