Media Blasting.... to be legal (Washington)
 

I'm in washington... I'm sure that like many other places in the country, traditional silica can not be done outdoors, and if indoors, a filter system needs to be in place, looks like for good reason. Not doing this full time, I don't wish to invest in a filter system if I can get away with using a diffrent abrassive medium.

In reference to our law on the subject
[http://slc.leg.wa.gov/wsr/1997/21/97-21-039.htm]

Paragraph 5 states "(c) Outdoor blasting shall be performed with either steel shot or an abrasive containing less than one percent (by mass) which would pass through a No. 200 sieve"

This leads me to believe I can use tarps, blast without a filter system in place if I use steel shot.

Does anyone else know the legality of this, or know of other forms of media that can be used other then traditional sand that would be complient for outdoor use?

Media Blasting.... to be legal (Washington)
 

Hi Zukezake Sounds like you need corn cob for blasting see link,
http://www.sandblaster.com/products/Abrasives/corn_cob.htm
This link is from Virginia Materlials, There are other joyces(sp)
1 hematite, 2 Coal slag 3 Recycled cullet. read up on them at http://www.sandblaster.com/ Good luck Cloudy

Media Blasting.... to be legal (Washington)
 

>Hi Zukezake Sounds like you need corn cob for blasting see
>link,
>http://www.sandblaster.com/products/Abrasives/corn_cob.htm
>This link is from Virginia Materlials, There are other
>joyces(sp)
>1 hematite, 2 Coal slag 3 Recycled cullet. read up on them
>at http://www.sandblaster.com/ Good luck Cloudy

Thanks for your responce.

It looks like, according to my state's clean air organization, as long as I plan to do Mobile abrasive blasting, rather then stationary blasting (good gawd this legal stuff is nutty) I don't need to install a BACT, as long as I use material that won't, let me get this right, media containing less than 1% which would pass through a #200 sieve.

What is a #200 sieve? How can one determine the grit qualifies?

Media Blasting.... to be legal (Washington)
 

Hi Again, this from Varginna materail "The size of a particle of blasting grit is the number given to the smallest screen it will pass through. In other words if something passes through a #30 screen but stops at the #25 screen it is known as a #30."
More infromation at http://www.sandblaster.com/screen.htm

More about differant blasting materail at
http://www.sandblaster.com/screen.htm

Please read about a hazard of sand here

"Silicosis from sandblasting" http://www.sandblaster.com/silicosis.htm

Goto Autobodystore.com BBS Discussion Board, People there for helpfull
http://www.autobodystore.com/cgi-bin/config.pl?index
Post a question to Rebecca, the Respirator Girl, about the hazard of sandblasting and Silicosis. She works for "Neoterik Health Technologies". . http://www.neoterik.com/
Good luck, Cloudy

Media Blasting.... to be legal (Washington)