I am working on a voltage reference deisgn that will go into an oven for the highest stability. I am looking for a good insulation material that can stand high temperatures safely (up to 80C). Looking at some HP frequency standard ovens I see a hard, light-weight insulation material of some type that looks like it would work really well, but I have no idea what it is. Does anyone have any suggestions? Thanks, Randy Evans AE6YG

You might look at AeroGel. Example here. http://www.ebay.com/itm/Aspen-Aerogel-SPACELOFT-Insulation-Hydrophobic-Mat-10-x-14-Sample-10mm-/171203844436?pt=LH_DefaultDomain_0&hash=item27dc8b5954 ----- Original Message ----- From: "Randy Evans" <randyevans2688@gmail.com> To: <volt-nuts@febo.com> Sent: Monday, July 06, 2015 8:43 PM Subject: [volt-nuts] Oven thermal insulation >I am working on a voltage reference deisgn that will go into an oven for > the highest stability. I am looking for a good insulation material that > can stand high temperatures safely (up to 80C). Looking at some HP > frequency standard ovens I see a hard, light-weight insulation material of > some type that looks like it would work really well, but I have no idea > what it is. Does anyone have any suggestions? > > Thanks, > > Randy Evans AE6YG > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.

Hi Randy, I used a box in a box then shot yellow window or gap fill insulation from your hardware store, use minimal expanding type. Fill around the spaces between the boxes with the tube but very slowly. You will get this on your hands so use your gloves because you will have to hold the boxes in place as it expands. After it dries cut the top off with a bread knife. May take a couple of tries to get what you want. Dallas > Date: Mon, 6 Jul 2015 17:43:45 -0700 > From: randyevans2688@gmail.com > To: volt-nuts@febo.com > Subject: [volt-nuts] Oven thermal insulation > > I am working on a voltage reference deisgn that will go into an oven for > the highest stability. I am looking for a good insulation material that > can stand high temperatures safely (up to 80C). Looking at some HP > frequency standard ovens I see a hard, light-weight insulation material of > some type that looks like it would work really well, but I have no idea > what it is. Does anyone have any suggestions? > > Thanks, > > Randy Evans AE6YG > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.

Not after looking at the price you won't! Prices around USD300 for an 8' by 4' sheet for 50mm thick. Regards, David Partridge -----Original Message----- From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Tom Miller Sent: 07 July 2015 03:07 To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] Oven thermal insulation You might look at AeroGel. Example here. http://www.ebay.com/itm/Aspen-Aerogel-SPACELOFT-Insulation-Hydrophobic-Mat-10-x-14-Sample-10mm-/171203844436?pt=LH_DefaultDomain_0&hash=item27dc8b5954

Randy, hi again, My idea sounds crude but it worked very well. The outer box was made out of small squares of aluminum drilled and taped with small aluminum angle pieces. I have two references in this oven, a fluke circuit based on the 731b, and one of Doug’s 10 volt references. I run the oven at 45°C. The gray board for the inner cover is ‘GATOR Board’ used to mount prints, it has a foam core. You should also have a guarded transformer, got mine from scrape fluke 510, Dallas On 7/6/2015 10:09 PM, Dallas Smith wrote: > Hi Randy, > > > > I used a box in a box then shot yellow window or gap fill insulation from your hardware store, use minimal expanding type. Fill around the spaces between the boxes with the tube but very slowly. You will get this on your hands so use your gloves because you will have to hold the boxes in place as it expands. After it dries cut the top off with a bread knife. May take a couple of tries to get what you want. > > > Dallas > > > > > >> Date: Mon, 6 Jul 2015 17:43:45 -0700 >> From: randyevans2688@gmail.com >> To: volt-nuts@febo.com >> Subject: [volt-nuts] Oven thermal insulation >> >> I am working on a voltage reference deisgn that will go into an oven for >> the highest stability. I am looking for a good insulation material that >> can stand high temperatures safely (up to 80C). Looking at some HP >> frequency standard ovens I see a hard, light-weight insulation material of >> some type that looks like it would work really well, but I have no idea >> what it is. Does anyone have any suggestions? >> >> Thanks, >> >> Randy Evans AE6YG >>