Darryl Keil Last Activity 2025-05-12 11:03 AM
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craig tufankjian

Posts: 308

Joined: 2004-02-01
Location: syracuse ny 13208

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Subject : 29 hg
Posted : 2007-07-18 2:04 PM
Post #33956
darryl,

is the hi flo press capable of reaching 29hg? i would like to try it to vacuum gas silicone rubber compound for mold making.


thanks
craig


 
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Darryl Keil

Posts: 1454

Joined: 2003-05-22
Location: Maine

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Subject : RE: 29 hg
Posted : 2007-07-18 9:26 PM
Post #33958 - In reply to #33956
Craig,

Industrial vacuum pumps top out around 27"Hg max, which is what you have. Scientific pumps are the ones that do 29"HG and higher.

Sincerely
Darryl Keil


 
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craig tufankjian

Posts: 308

Joined: 2004-02-01
Location: syracuse ny 13208

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Subject : RE: 29 hg
Posted : 2007-07-18 10:00 PM
Post #33959 - In reply to #33958
thanks darryl......


 
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Dave Shaw

Posts: 37

Joined: 2005-11-06
Location: Arizona

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Subject : RE: 29 hg
Posted : 2007-09-08 12:41 PM
Post #34039 - In reply to #33956
Hi Craig,

You might be interested in this site if you haven't already looked at it. It deals with casting parts in silicone and urethane molds. I shows you how to do all of it. I use some of the high temperature silicone to cast pewter. http://www.freemansupply.com/video.htm

It is a pretty interesting site if you have any desire to cast low melting point metals or plastics.

Dave


 
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craig tufankjian

Posts: 308

Joined: 2004-02-01
Location: syracuse ny 13208

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Subject : RE: 29 hg
Posted : 2007-09-08 1:50 PM
Post #34040 - In reply to #34039
hi dave,

i did see all the videos at freeman supply. i was hoping i could finagle my existing vacuum pump to accommodate the use of silicone mold material but i need a higher hg. we are doing a plaster job and by making my own molds i can save thousands.

so i guess i have to spend the $$$$ to buy a vacuum degasser if i want to use silicone. i can avoid that cost if i use urethane but then i'll have to use release agent on the molds, that can get messy i hear. silicone mold are the best way to go.
thanks for the info though.

craig


 
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Dave Shaw

Posts: 37

Joined: 2005-11-06
Location: Arizona

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Subject : RE: 29 hg
Posted : 2007-09-08 3:07 PM
Post #34041 - In reply to #34040
Craig,

Maybe Douglas and Strugess, Inc at www.artstuff.com can help you. They have a section called "Ask Zardoz" and they may be able to direct you to a silicone that does not require a vacuum degas. I don't do it and I don't usually have a bubble problem. Anyway, I seem to recall that there are some that don't require it. I would be concerned about the compatibility of any mold release and the finish. I'll ask a friend about it. He does a lot of casting and has made pieces for missing carved moldings to restore old picture frames.

Have you tried this w/o degassing?

Dave


 
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Dave Shaw

Posts: 37

Joined: 2005-11-06
Location: Arizona

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Subject : RE: 29 hg
Posted : 2007-09-08 4:07 PM
Post #34042 - In reply to #34040
This is a surplus place that I have bought vacuum pumps from before I found Daryl. The stuff I have received from them has been brand new and all worked great. They do have what looks like an oil vacuum pump which may go to 29" Hg. Worth a call to them because the price is certainly good. http://www.surpluscenter.com/item.asp?UID=2007090814553767&item=4-1559&catname=air

Hope this is helpful and that I'm not wasting your time.

Dave
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