KR> Aeropoxy Chameleon
Has anyone ever seen aeropoxy hardener turn deep red in color such that it changes the mix's color from amber to red? Wondering what happened there. Matt - Matthew Elder Orangeburg, SC http://www.infinigral.com/melder My Airplane Project: http://www.infinigral.com/melder/flying/KR1/
KR> Aeropoxy Chameleon
Yep, happens all the time, especially with aged hardener. It has something to do with being exposed to oxygen. It does not affect the properties and is still good to use. Some do not like to use it in structural applications just to be on the safe side. However, I have used it in many instances and have seen no adverse effects. Mark Jones (N886MJ) Wales, WI Web site: www.flykr2s.com Mailto:flyk...@wi.rr.com -Original Message- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of Matthew Elder Sent: Thursday, July 20, 2006 8:29 AM To: KRnet Subject: KR> Aeropoxy Chameleon Has anyone ever seen aeropoxy hardener turn deep red in color such that it changes the mix's color from amber to red? Wondering what happened there. Matt - Matthew Elder Orangeburg, SC http://www.infinigral.com/melder My Airplane Project: http://www.infinigral.com/melder/flying/KR1/ ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
KR> Aeropoxy Chameleon
Matt, Some where along the line I was told that it is from absorbing moisture with age. I stopped using the stuff that had changed color for anything structural and used it up for micro filler and such so it did not go to waste. I do not know if it harms the integrity of the epoxy, I just did not continue to use it because it didn'tseem right. I used West Systems and am just guessing it would be the same cause. Joe Horton, Coopersburg, PA. joe.kr2s.buil...@juno.com On Thu, 20 Jul 2006 06:29:05 -0700 (PDT) Matthew Elder writes: > Has anyone ever seen aeropoxy hardener turn deep red in color such > that it changes the mix's color from amber to red? > Wondering what happened there. > > Matt
KR> Aeropoxy Chameleon
It will not set up for me. It has stayed sticky for a week now. Called the people where I bought it and they gave me the # of the producer. I feel like its crap and I got ripped off. It must work for someone. I mixed it like it said ...four times. Could have been a bad batch but it won't happen to me agaim. Steve Bray Jackson, Tennessee >From: "Joseph H. Horton" >Reply-To: KRnet >To: eldo...@yahoo.com,kr...@mylist.net >Subject: Re: KR> Aeropoxy Chameleon >Date: Thu, 20 Jul 2006 10:05:38 -0400 > >Matt, > Some where along the line I was told that it is from absorbing >moisture with age. I stopped using the stuff that had changed color for >anything structural and used it up for micro filler and such so it did >not go to waste. I do not know if it harms the integrity of the epoxy, I >just did not continue to use it because it didn'tseem right. I used West >Systems and am just guessing it would be the same cause. > >Joe Horton, Coopersburg, PA. >joe.kr2s.buil...@juno.com > >On Thu, 20 Jul 2006 06:29:05 -0700 (PDT) Matthew Elder > writes: > > Has anyone ever seen aeropoxy hardener turn deep red in color such > > that it changes the mix's color from amber to red? > > Wondering what happened there. > > > > Matt > >___ >Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp >to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net >please see other KRnet info at http://www.krnet.org/info.html
KR> Aeropoxy Chameleon
If you're considering trying another brand of resin, have a look at MGS. Wicks and Aircraft Spruce carry it. It's a formulation designed in Europe for their Aerospace industry and is exclusively used in Diamond Aircraft (Katana). It's of very low toxicity, cure times are adjustable, has excellent wetout properties and is very user friendly. I've used a few different epoxys and this stuff is my favourite. It just works every time Steve Bray wrote: It will not set up for me. It has stayed sticky for a week now. Called the people where I bought it and they gave me the # of the producer. I feel like its crap and I got ripped off. It must work for someone. I mixed it like it said ...four times. Could have been a bad batch but it won't happen to me agaim. Steve Bray Jackson, Tennessee >From: "Joseph H. Horton" >Reply-To: KRnet >To: eldo...@yahoo.com,kr...@mylist.net >Subject: Re: KR> Aeropoxy Chameleon >Date: Thu, 20 Jul 2006 10:05:38 -0400 > >Matt, > Some where along the line I was told that it is from absorbing >moisture with age. I stopped using the stuff that had changed color for >anything structural and used it up for micro filler and such so it did >not go to waste. I do not know if it harms the integrity of the epoxy, I >just did not continue to use it because it didn'tseem right. I used West >Systems and am just guessing it would be the same cause. > >Joe Horton, Coopersburg, PA. >joe.kr2s.buil...@juno.com > >On Thu, 20 Jul 2006 06:29:05 -0700 (PDT) Matthew Elder > writes: > > Has anyone ever seen aeropoxy hardener turn deep red in color such > > that it changes the mix's color from amber to red? > > Wondering what happened there. > > > > Matt > >___ >Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp >to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net >please see other KRnet info at http://www.krnet.org/info.html ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
KR> Aeropoxy Chameleon
"It will not set up for me. It has stayed sticky for a week now." How humid is it in your area? Has been real bad here and that will affect your setup time. We have been running in the 90 deg and 90 % Eric Pitts KR2S Terre Haute Indiana
KR> Aeropoxy Chameleon
I used it for the majority of this airplane and never had a problem with it. See N64KR at http://KRBuilder.org - Then click on the pics See you in Mt. Vernon - 2006 - KR Gathering There is a time for building and a time for FLYING and the time for building is OVER. Daniel R. Heath - Lexington, SC "It will not set up for me. It has stayed sticky for a week now."
KR> Aeropoxy Chameleon
At 09:54 AM 7/20/2006, you wrote: >It will not set up for me. It has stayed sticky for a week now. The mixture ratios for ANY epoxy must be EXACT. I suggest that your mixture ratio is off. Larry Severson Fountain Valley, CA 92708 (714) 968-9852 lar...@socal.rr.com
KR> Aeropoxy Chameleon
Hay guys. I had the same problem and have had it off and on several times. How humid is it? I called aeropoxy and they said to try one trick. Take a rag and put MEK on it and and lighty wipe the surface. When it won't get hard because of mosture its called blushing. I don't know if age has anything to do with it. But call them to be sure or try a spot thats not important. One thing i found that works good is to build a tent over whatever your working on after the layup and put one of thoes electric oil filled radiator heaters under the tent. No open flame and you can regulate the temp. I've hade it up over a 100 degrees. The aeropoxy people said the hotter its cured the more restant it is to heat after its cured.Anyway hop that helps. -Original Message- >From: larry severson >Sent: Jul 20, 2006 6:42 PM >To: KRnet >Subject: Re: KR> Aeropoxy Chameleon > >At 09:54 AM 7/20/2006, you wrote: >>It will not set up for me. It has stayed sticky for a week now. > >The mixture ratios for ANY epoxy must be EXACT. I suggest that your >mixture ratio is off. > > >Larry Severson >Fountain Valley, CA 92708 >(714) 968-9852 >lar...@socal.rr.com > > >___ >Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp >to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net >please see other KRnet info at http://www.krnet.org/info.html
KR> Aeropoxy Chameleon
I thought MEK was used for polyester resins not epoxies but hey if it works!?? I used an electric blanket over a plastic sheet on my layups when necessary...wife wasn't amused. John Martindale 29 Jane Circuit TOORMINA NSW 2452 AUSTRALIA phone: 61 2 66584767 (H) 61 2 66869094 (W) mobile: 0417 584767 email:johnja...@optusnet.com.au web: www.members.optusnet.com.au/johnjanet/Martindale.htm - Original Message - snip > Hay guys. I had the same problem and have had it off and on several times. > How humid is it? I called aeropoxy and they said to try one trick. Take a > rag and put MEK on it and and lighty wipe the surface.
KR> Aeropoxy Chameleon
You got it MSgt. , I'm in Tennessee and that stands to reason. Steve Bray Jackson, Tennessee >From: Pitts Eric MSgt 181FW/MXOO >Reply-To: KRnet >To: kr...@mylist.net >Subject: KR> Aeropoxy Chameleon >Date: Thu, 20 Jul 2006 13:38:04 -0400 > >"It will not set up for me. It has stayed sticky for a week now." > > > >How humid is it in your area? Has been real bad here and that will affect >your setup time. We have been running in the 90 deg and 90 % > > > >Eric Pitts > >KR2S > >Terre Haute Indiana > > > > > >___ >Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp >to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net >please see other KRnet info at http://www.krnet.org/info.html
KR> Aeropoxy Chameleon
Larry: Underwood may be shooting you straight. When I worked for AeroJet in Sacramento they were winding 2nd stage "Peace Keeper" motor cases with "Pre-preg Kevlar Filament Roving" The most importent reguirement was that it be conditioned in a 20% RH environment after being prepreged with Resin because moisture levels above that lead to delaminations in the wound cases.. That ment a humidity controled environment which was very expensive to do with refrigeration. I inquired as to what the maximum temperature was that the roving could be continuously exposed and was told 150 Deg. F. I determined that in Sacramento if it were stored at 135 Deg. F we could keep it below 20% RH. because the 99% design wet bulb was 71 Deg. (if I remember right in Sacramento) We had to control the absolute humidity in the winding area to 63 gr. of water per lb of air and the winding was heated to with "Heat Lamps" to a point where the resin matrix was activated and the roving would bond together. I am not knowledgeable of the system details as much of it I think was classified and may still be. So in short humidity levels can have a huge impact on composit resin behavior. In short I suspect what A. Underwood says may well be true and his anecdotal evidence seems to bear him out. Don Burlington, IA AUnderwood wrote: > Hay guys. I had the same problem and have had it off and on several times. > How humid is it? I called aeropoxy and they said to try one trick. Take a rag > and put MEK on it and and lighty wipe the surface. When it won't get hard > because of mosture its called blushing. I don't know if age has anything to > do with it. But call them to be sure or try a spot thats not important. One > thing i found that works good is to build a tent over whatever your working > on after the layup and put one of thoes electric oil filled radiator heaters > under the tent. No open flame and you can regulate the temp. I've hade it up > over a 100 degrees. The aeropoxy people said the hotter its cured the more > restant it is to heat after its cured.Anyway hop that helps. > > -Original Message- > >From: larry severson > >Sent: Jul 20, 2006 6:42 PM > >To: KRnet > >Subject: Re: KR> Aeropoxy Chameleon > > > >At 09:54 AM 7/20/2006, you wrote: > >>It will not set up for me. It has stayed sticky for a week now. > > > >The mixture ratios for ANY epoxy must be EXACT. I suggest that your > >mixture ratio is off. > > > > > >Larry Severson > >Fountain Valley, CA 92708 > >(714) 968-9852 > >lar...@socal.rr.com > > > > > >___ > >Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > >to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > >please see other KRnet info at http://www.krnet.org/info.html > > ___ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html
KR> Aeropoxy Chameleon
D F Lively wrote: >>When I worked for AeroJet in Sacramento they were winding 2nd stage "Peace Keeper" motor cases with "Pre-preg Kevlar Filament Roving" The most importent reguirement was that it be conditioned in a 20% RH environment after being prepreged with Resin because moisture levels above that lead to delaminations in the wound cases..<< The problem with Kevlar layups absorbing moisture is a Kevlar problem, not an epoxy problem. That kind of moisture absorbtion has caused delamination of Kevlar parts on airliners due to freezing, and hence, it's fall from grace in even non-structural parts in the aviation industry. Don't even get me started on Kevlar. Although it makes a dandy bulletproof vest, it has virtually no use on aircraft. I've been using some dark red Aeropoxy hardener for years now, and see no difference in the new amber stuff. If you can't get that stuff to harden in 98F degree weather, there's a real problem somewhere. I lay up glass or CF using Aeropoxy in the morning, leave it in the high humidity 110 degree hangar, and fly it and/or sand it later in the afternoon... Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net --