Need More Gentle Media

Mikepb

I blasted a car part mold today using soda but it was too aggressive and took off some of the design. Is there anything out there more gentle than soda? The company is measuring this to a very fine degree.
Mike

ausisoda

have you tried a lower pressure?

If you turned the pressure down and ran water to soften the cutting action you should be right.
What are the moulds made of?

Mikepb

The company wanted me to use 90 psi to see what it would do over time . I told them that we should use lower pressure to the point were it would remove the coating. What hapened is it has low and high grain in the mold and it would dull the high grains.The low grains are dull and the high grains need to stay shinny.The mold is aluminum and is used for dashboards.They will not let me use water.They asked about talc I have never used it. Do you think it would keep the shine?Were would I buy talc?
Mike

ausisoda

Hey mate at the end of the day your going to have to put your foot down and do it the way you want to do it and if that means blasting it at 40psi so be it i cant see the issue with using water you can always blow it dry.

I do the same sort of thing but the moulds are used in the styrene industry and i blast them at 40-60psi with the water ring.

But at the end of the day you cant defy physics if the coating is harder then the substrate there isn't much you can do this sounds like a job for a chemical

Betterblast

Perhaps you might try a diferent brand of soda as well as get the finest grade you can. I know Natrium can be a little tougher than other brands. I have never tried talc.

Betterblast

I think Ausi Is right on. They came to you after all. Ask them for a couple of sample molds so you can play around. Hit one with water and if it looks good to you show them and let them decide. I don't know what you meant by seeing what 90 psi would do over time. What would time have to do with it after its blasted?

ausisoda

I use to shoot aluminium boats to remove the old paint and it does leave a slight dull profile at 90 psi aluminium is very soft

rlaird

Hey Mike,
Have you tried shooting some media that has been shot once already,
That seems to soften it up a bit also, I havent shot any talcum but shot soda is pretty fine and pretty soft.

kell490

Check out http://www.armex.com/Products/products0103.aspx They have different blends of soda.