Does Anyone Actually Blast With Sand? - Sandblasting - Contractor Talk

Does Anyone Actually Blast With Sand?

 
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Old 01-09-2011, 06:16 PM   #1
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Does Anyone Actually Blast With Sand?


Since joining the forum, I've gotten quite an education by lurking and watching you guys talk about blasting. I have no desire to do it myself, but I love to just know stuff.

I see talk about soda, glass and walnut shells, but hardly ever any mention of sand. Anyone care to give a general rundown on which is used for what? And for a bonus, why?
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Old 01-09-2011, 06:25 PM   #2
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Re: Does Anyone Actually Blast With Sand?


their goin to eat you alive

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Old 01-09-2011, 06:50 PM   #3
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Re: Does Anyone Actually Blast With Sand?


Wouldn't be the first time.
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Old 01-09-2011, 06:59 PM   #4
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Re: Does Anyone Actually Blast With Sand?


Sand it toxic the free silica if you breath it in will damage your lungs.
Blasting with sand has been outlawed in most countries.

Soda is a soft abrasive only 3moh it is sodium bicarbonate It is used for decreasing and paint removal where a profile is not required or desirable. It is used where no damage to the material underneath the coating is required. Like engines car panels masonry and wood generally.

Glass hard abrasive 6moh used as a general abrassive but the finer grades can also be used on delicate materials with care.
The best all round material in my book but it requires a skilled operator to use on the delicate stuff if you are not careful it can cause damage.

Walnut grit is a little bit harder then soda 3.5 to 4moh and it is reusable unlike soda it is not as dusty but it cuts different as well.
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Old 01-09-2011, 07:02 PM   #5
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Re: Does Anyone Actually Blast With Sand?


here is a walnut shell vid that will give you an idea.

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ERROR: If you can see this, then YouTube is down or you don't have Flash installed.
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Old 01-09-2011, 07:35 PM   #6
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Re: Does Anyone Actually Blast With Sand?


If you like you can see one of my own walnut jobs on youtube. Search (walnut betterblast)
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Old 01-09-2011, 07:56 PM   #7
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Re: Does Anyone Actually Blast With Sand?


Thanks, guys. So these days, it's basically soda, walnut or glass for the great majority of work?

You reclaim walnut, but not glass? How do you ensure when reclaiming, that you aren't going to also gather up the gunk you just removed and wind up passing that through your equipment?
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Old 01-09-2011, 08:17 PM   #8
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Re: Does Anyone Actually Blast With Sand?


I occasionally use 70/200 sand for cleaning pavers or concrete...watch the dust guys blow off before you pull your helmet.
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Old 01-09-2011, 09:20 PM   #9
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Re: Does Anyone Actually Blast With Sand?


You have Coal Slag, Copper Slag, Aluminum Oxide, Steel Grit, Flint, Plastic Pellets, Starolite, Soda, Corn Cob, Walnut and the list goes on. A lot of people still use Silica Sand. It's not been outlawed, but is frowned upon in the industry. You can still use it safely as long as you take the appropriate action for protection. As with any dust, you do not want to breathe it. Non of it is good to breathe regaurdless. The thing with Silica Sand, is the crystal will stick to the lung tissue and never come out causing scar tissue to form and eventually cause silicoses. Always check with your local codes for what is ok to use in a open air blasting operation. If you contain, protect and collect you can use any abrasive that you want to. As for what abrasive to use, that depends on what your blasting and what type of surface finish your looking for.
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Old 01-09-2011, 09:39 PM   #10
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Re: Does Anyone Actually Blast With Sand?


Ever since I've joined this site I've wondered what soda blasting was . Thanks for popping the question tin
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Old 01-09-2011, 10:28 PM   #11
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Re: Does Anyone Actually Blast With Sand?


Benny knows his stuff Tin. So do the other guys so ask away. They wont hurt you to bad.
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Old 01-09-2011, 10:35 PM   #12
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Re: Does Anyone Actually Blast With Sand?


Glass can be reused as well as most other abrasives untill they break down to dust.
Most of what goes through a screen into a blast pot wont hurt the pot or other equipment.
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Old 01-09-2011, 11:39 PM   #13
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Re: Does Anyone Actually Blast With Sand?


Quote:
Originally Posted by blast4cash View Post
Glass can be reused as well as most other abrasives untill they break down to dust.
Most of what goes through a screen into a blast pot wont hurt the pot or other equipment.
Obviously, you're screening large flake and other debris from the blast process, but how big is the screen? Is it the same size as the original blast material? Do you have multiple sizes, depending on the size/type of media you're using? What is the record number of questions asked in a row? Am I getting close yet?

Ok, I was teasing with those last two questions, but I was serious about the others.
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Old 01-09-2011, 11:58 PM   #14
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Re: Does Anyone Actually Blast With Sand?


Quote:
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You have Coal Slag, Copper Slag, Aluminum Oxide, Steel Grit, Flint, Plastic Pellets, Starolite, Soda, Corn Cob, Walnut and the list goes on.
Never doubted it. Taking it as a given that you select the appropriate material depending on what you're blasting and the desired results, what does that mean with respect to your equipment? How many significant pieces are needed?

Obviously you need the appropriate CFM for both the material being used and what you're removing, as well as the appropriate nozzle(s). Is it practical for a small-time guy to set himself up for just about anything that comes down the pike? Not talking about monster jobs, that's a whole other scene of course.

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Benny knows his stuff Tin. So do the other guys so ask away. They wont hurt you to bad.
I know. Look at my profile to see how long I've been lurking.
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Old 01-10-2011, 12:04 AM   #15
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Re: Does Anyone Actually Blast With Sand?


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Is it practical for a small-time guy to set himself up for just about anything that comes down the pike? Not talking about monster jobs, that's a whole other scene of course.
You're not thinking of going into business with that blast cabinet you bought at Harbor Freight, are you?
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Old 01-10-2011, 12:15 AM   #16
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Re: Does Anyone Actually Blast With Sand?


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You're not thinking of going into business with that blast cabinet you bought at Harbor Freight, are you?
Oh hell no. I like to put stuff together, not break it down. Besides, none of the HF fittings match anything else in the known universe.
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Old 01-10-2011, 01:03 AM   #17
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Re: Does Anyone Actually Blast With Sand?


That is what's stopped me from getting one of the HF cabinets. I just have small, periodic stuff to clean or prep for paint, so I don't need a $1000 rig, but the problem with the cheap chit is that the parts are not replaceable/interchangeable with good quality stuff, so that leaves me without a blast cabinet.

One of these days when I win the lottery I'm going to get an honest to goodness real cabinet, to go with the rest of the machine shop.
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Old 01-10-2011, 01:05 AM   #18
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Re: Does Anyone Actually Blast With Sand?


Oh, and to go along with the HF cabinet, playground sand is on sale at Home Depot ... It's the same stuff the pros use, right?
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Old 01-10-2011, 07:03 AM   #19
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Re: Does Anyone Actually Blast With Sand?


"what does that mean with respect to your equipment? How many significant pieces are needed?"

Most equipment will blast anything. You need at least 185 cfm and you adjust the psi to the work. The cfm is the same out of your compressor all the time. Larger nozzles just use more so you need to match them for best results.

"Glass can be reused as well as most other abrasives untill they break down to dust."

I think 70/200 already is dust? I never tried that grade. I'll have to see if I can get one bag to see wehat I might use it for.

Tin. I don't choose to reuse anything. It takes quite a while to scrape it up shovel it in a bucket shake it a little at a time through a screen... I could have been working all that time and sooner on to the next project to make some real cash instead of hoping to save $7.00 It also cuts slower and tends to clog the flow with the very fine dust mixed in. It also takes the chance of pushing contaminates into the surface of what you are blasting. and in some cases when it matters you will get a varied surface finnish as you run out of reusable and switch to new it cuts differently and the finnish can be uneven and less professional looking. That being said I see a lot of guys here are fans of reusing.

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Old 01-10-2011, 09:31 AM   #20
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Re: Does Anyone Actually Blast With Sand?


If your going to re-use ANY blast media, you should be using the proper equipment to do so. It should have a clarafier to filter out the larger particles and a good air wash to remove the dust. Clemco, Axxiom, and Empire is just a few and makes some. Also, you have to take into consideration of what your blasting. I have seen just the other week where the entire surface was contaminated because the contractor failed to Pre-Clean the surface SSPC-SP1 Solvent cleaning and then took contamination from one spot and spread it around the blast area by trying to re-use the abrasive and contaminated the whole surface. A Black Light does not lie. Lit up with green specs all over and we took the port cover off the blast pot and the inside of the pot lit up as well. Doing that will take contamination from one job right on to the next job. So, be careful when trying to re-use abrasive.

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