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Removable
Duracetal injection
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<blockquote data-quote="dentcre" data-source="post: 61479" data-attributes="member: 428"><p>hi Allan,, I been injecting acetal resin for the past 10 years and have made thousands of bilateral partials and other stuff.</p><p></p><p>I see a strange way to sprue on your pictures,,,looks like a "metal casting" way to sprue.</p><p>might be the way your flasks are , never seen this before.</p><p></p><p>I use quattro injection machines, looks like your problem is melting temperture maybe but more important ,,flask temperture.</p><p></p><p>I use duracetal resin. insert cartridge from cero to 190 c and hold for 20 minuts, flask goes in also at cero. inject at 90 psi-. the quattro machine has the furnace intergated so </p><p>ita more convenient and always get excelent results. I do not use wax spues, I flask the </p><p>appliance then boil out , after that I grind the sprue channels with a big bur. that way all are identical in thiknes ,,but VERY important is that you do not hit the appliance at full thiknes! alway end at a pencil tip shape.</p><p></p><p>try to heat your flask before injecting, .hot!</p><p></p><p>oh..on the investing i sink the wax pattern half way, leaving exposed, boilout and make sure you dont have any pieces of stone in there and remove sharp corners that might break when closing before you close the flask.</p></blockquote><p></p>
[QUOTE="dentcre, post: 61479, member: 428"] hi Allan,, I been injecting acetal resin for the past 10 years and have made thousands of bilateral partials and other stuff. I see a strange way to sprue on your pictures,,,looks like a "metal casting" way to sprue. might be the way your flasks are , never seen this before. I use quattro injection machines, looks like your problem is melting temperture maybe but more important ,,flask temperture. I use duracetal resin. insert cartridge from cero to 190 c and hold for 20 minuts, flask goes in also at cero. inject at 90 psi-. the quattro machine has the furnace intergated so ita more convenient and always get excelent results. I do not use wax spues, I flask the appliance then boil out , after that I grind the sprue channels with a big bur. that way all are identical in thiknes ,,but VERY important is that you do not hit the appliance at full thiknes! alway end at a pencil tip shape. try to heat your flask before injecting, .hot! oh..on the investing i sink the wax pattern half way, leaving exposed, boilout and make sure you dont have any pieces of stone in there and remove sharp corners that might break when closing before you close the flask. [/QUOTE]
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