Pores in white gold 18k casting (with vacuum) see the images

[jose.chake]

I'm doing casting with yellow resin, in white gold 18k (nickel alloy zinc alloy) I burn it at 400f (1 hour) 800 (2 hour) 1400 (3 hour) and 1100 (one hour). I'm heating the gold with oxygen butane, I'm using vacuum. But I have many pores in the bottom of the rings, what do you recommend? the pores when sanding come out more and more.

The curing is perfect, 6 hours in UV and one in the sun. Hard pieces

gold has already been used twice, but with new gold, the same thing happens to me,
regards!

[mwm]

If that was my casting, I'd be thinking the melt was too hot. If nothing else, the back of your button should be a smooth hemisphere / semi-flat lake in karat gold.

[RobertW]

I agree with Mark.
To be safe, 18k white needs at least 50% fresh metal every melt because the alloys burn away... even more when the metal is overheated.

[Robert Howle]

Agree with those above and I have my flask temp/oven temp at 950 F for casting.

Robert Howle

[sandblasthatcasting]

Wow! that is overheating the metal!! way too hot!!