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    Porosity on semi precious

    Discussion in 'Metal' started by Dimis, Nov 17, 2016.

    1. TheLabGuy

      TheLabGuy Just a Member Full Member

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      The question is why would you want too? lightly sandblast will do it if you need it removed
       
    2. 2thm8kr
      Devilish

      2thm8kr Beanosavedmysociallife Full Member

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      Toothbrush and water for me.
       
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    3. 2thm8kr
      Devilish

      2thm8kr Beanosavedmysociallife Full Member

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      Because the white areas are salts left from the acid etch. Sandblasting etched surface will get your knuckles smacked by Ivoclar.
       
    4. TheLabGuy

      TheLabGuy Just a Member Full Member

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      ooohh, talk dirty to me :p
       
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    5. sidesh0wb0b
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      sidesh0wb0b Well-Known Member Donator Full Member

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      carbides! not stones
       
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    6. Car 54
      No Mood

      Car 54 Well-Known Member Donator Full Member

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      Thanks for the tip :) Maybe I should at least try that for noble metal, and then using the ultrasonic as per LG.

      I use Keystone Red Flash discs and Komet Pink stones, which are non contaminating. Things get finished quicker that way for me :)
       
    7. sidesh0wb0b
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      sidesh0wb0b Well-Known Member Donator Full Member

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      non-contaminating is sort of a myth with stones.
      its like saying a heatless is actually heat-less.

      the binders in stones are usually derivatives of silicates which are chemicals afterall. while they are metalloids, some of the gurus believe they still can contaminate metals during finishing. my good buddy (I wish I knew him) Makotoa Yamamoto wrote in length about how important it was to use carbides over stones for finishing.
       
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    8. Car 54
      No Mood

      Car 54 Well-Known Member Donator Full Member

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      Heatless is actually heat-less...lol, good one.

      You really bring up some good points, Bob, and especially the ones we've been hearing for years, like non contaminating silaca binders (thanks for reminding me of that one). On this cold winters night tonight, maybe I should re-read that chapter in my Yamamoto Metal Ceramics book...it's still one of the best out there, isn't it!!
       
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    9. sidesh0wb0b
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      sidesh0wb0b Well-Known Member Donator Full Member

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      sadly, I don't own it...but I will one day add it to my collection as I feel its one of the best if not the best metal ceramics info out there!
      cheers man!
       
    10. Car 54
      No Mood

      Car 54 Well-Known Member Donator Full Member

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      Agree...cheers to you too, friend :)
       
    11. rkm rdt
      Artistic

      rkm rdt Well-Known Member Donator Full Member

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      I suggest you look in the "history" section.
       
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    12. sidesh0wb0b
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      sidesh0wb0b Well-Known Member Donator Full Member

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      artifacts are usually worth more and have more content than the bs out nowadays. :D
       
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    13. CatamountRob
      Dead

      CatamountRob Banned Member Full Member

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      Hell yeah. Take @doug for example......
       
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    14. Den'ee
      Breezy

      Den'ee Member Full Member

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      sand blast before ?and use gloves when op....
       
    15. Dimis
      Confused

      Dimis Member Full Member

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      Thanks guys for all the advices i tried them all but porocity keeps coming it seem my metal is contaminated. A question again if you can help im using semi only because i cast nobel implants custable that has precious base. People told me that they use a non precious metal to cast and they dont have problems of merging the two metals. Do anybody know anything. I dont want to use semi precious any more and my doc likes nobel


      Sent from my iPad using Tapatalk
       
    16. CatamountRob
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      CatamountRob Banned Member Full Member

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      Are you asking if you can cast UCLA type abutments with non-precious alloy?
       
    17. Den'ee
      Breezy

      Den'ee Member Full Member

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      maybe too little burn out time before casting and or to much heat in casting or what material you use in investing ? are you using straight liquid ? or 50-50 liquid water ? the bench set up time is also important .
       
    18. Dimis
      Confused

      Dimis Member Full Member

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      Yes but the ucla abudments that have a precious base ?


      Sent from my iPad using Tapatalk
       
    19. Den'ee
      Breezy

      Den'ee Member Full Member

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      glassbead sandblast will do it. softly n quick like
       
    20. CatamountRob
      Dead

      CatamountRob Banned Member Full Member

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      I don't believe it is recomended and I would not, however, I don't use NP for anything.
       
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