Author Archives: Industrial Supply, Inc.

About Industrial Supply, Inc.

SandblastingAbrasives.com is an online store, offering sandblasting media, boron nitrides, and sandblast nozzles. Rather than stocking one or two popular sizes of abrasive grains, we sell the FULL range of ANSI & FEPA gradations for all our abrasives. Most of our sandblast media can be purchased online in small quantities, or offline via a wholesale account.

Schematic Drawing of a Venturi Nozzle

Venturi Sandblast Nozzles Vs Straight Bore Blast Nozzles

Schematic Drawing of a Venturi Nozzle

So what is the real difference between these two types of nozzles, and why should you care?  Well, for starters, you should know that the introduction of venturi nozzles over thrity years ago still remains the last major advance in nozzle technology.  Thirty years is a long time!

You see up until the mid 1950’s, all sandblasting nozzles were straight bore.  They had a tapered converging entry, a parallel throat section, and a full length straight bore and straight exit.  Over time, blast operators noticed that as the interior of these nozzles began to wear and erode away, a larger and more efficient blast pattern resulted.  This observation led to the development of the venturi design.

A long venturi nozzle is characterized by having a long tapered converging entry, with a short flat straight section, followed by a long diverging end which widens as you reach the exit end of the nozzle.  A long converging entry introduces the air and abrasive mix into the nozzle, then is constricted into a short flat straight section, and then forced out the flared exit end.  Venturi nozzles can increase productivity by as much as 70% due to the larger abrasive pattern that results as well as due to the increase in velocity of the abrasive as it exits the nozzle.  In fact, velocity (outlet speed) of the exiting abrasive can be nearly double that of a straight bore nozzle, and this is force that cleans a surface faster!

So if you are in the market looking to upgrade your operation, perhaps changing to a venturi nozzle might be a good place to start.  More on that later…

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Garnet Abrasive Mil Profiles (Anchor Pattern)

Sizing and Profile Information:  (!)  NOTES:  Anchor patterns will vary tremendously based on other variables such as hardness & type of steel, level of corrosion being removed, blast angle, blast distance from the steel, etc.

  • 36 – Coarse.   Produces a 3.5 – 4.5 mil profile on steel surfaces.  Generally used for thick coatings, marine fouling, and rust.
  • 30×40 – Intermediate.  Produces a  2.5 – 4.0 mil profile on steel surfaces.  Used on heavier coatings up to 40 mils, and rust.
  • 30×60 Medium.  Produces a 2.0 – 3.5 mil profile on steel surfaces.  Considered to be an overall workhorse grade for new steel and maintenance for coatings up to 20 mils.
  • 80 Mesh – Medium Fine.  Produces a 2.0 – 3.0 mil profile on steel surfaces.  Great for aluminum and other sensitive substrates.
  • 100 Mesh – Fine.  Produces a 1.0 – 2.5 mil profile on steel surfaces.  Also can be used on aluminum and fiberglass, as well as for rust removal and mill scale on new steel.

Garnet is a industrial gemstone sandblasting abrasive  that creates a profile virtually free of embedment, which makes it excellent for coating adhesion, as well as applications where low or no transfer of grit into the substrate can be tolerated.  Clean and Fast!

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Mil Profile Chart for Brown Aluminum Oxide

Aluminum Oxide Grit

Sandblast Grit - aluminum oxide

Mil Profile Chart for Aluminum Oxides – These Are Approximations Only!  Approximations are based on using a pressure blaster on hot rolled steel, having tightly adhering mill scale, using a 90-100 psi.  Anchor patterns will vary tremendously based on other variables such as hardness & type of steel, level of corrosion being removed, blast angle, blast distance from the steel, etc.

These mil profiles are for Brown Fused Aluminum Oxides, including Sinterblast.

1 mil profile = 100 grit aluminum oxide
1.5 mil profile = 50 grit aluminum oxide
2 mil profile = 36 grit aluminum oxide
2.5 mil profile = 24 grit aluminum oxide
3 mil profile = 16 grit aluminum oxide
4 mil profile = 12 or 16 grit aluminum oxide

Aluminum oxide is a very hard, tough, durable abasive that can be recycled many times.  It is also expensive, so you should only use it in a blast cabinet or blast room where it can be recycled and reused many times.  Recommended by OSHA as a replacement media for silica sand.

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Do It Your Self Sandblasting

Here is a fantasic business in Vancouver, B.C. that a couple of entrepenurs started recently. Do-it-yourself sandblasting! Now why didn’t I think of that?  Don’t we all have old furniture, rusted equipment, & gardening supplies that could use a facelift?

Everything from vintage metal toys and wooden chairs to bathroom tiles and car parts are being scoured clean at a Victoria do-it-yourself sandblasting company.

Customers pay $1 per minute (minimum 15 minutes) to blast their items, or $1.35 per minute (minimum 20 minutes) for a staffer to do the work at Blast It!, located in the Hillside industrial area at 2639 Turner St.

It’s easy. An item is placed inside a self-contained cabinet. Once the door is locked, a customer standing outside the cabinet slips his or her hands into heavy duty gloves which run into the interior. Turn on the control with your foot, point the nozzle of the wand at the item and the blasting starts. Continue reading

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Sandblasting Media: Welcome to SandblastingAbrasives.com!

Offering a FULL line of sandblasting media, powders, and blast nozzles.

Silicon Carbide Grits 12 and 30 ANSI

Silicon Carbide Sandblasting Media

Having trouble finding a triple graded, Boron Carbide Sapphire Polishing Powder?  Or a very coarse Brown Fused Aluminum Oxide for anti-skid applications?  We offer the full line of ANSI & FEPA sandblasting media and powders, not just the most popular sizes!

Now offering a full line of Made-In-The-USA Sandblasting Nozzles, in both Boron Carbide and Tunsten Carbide.

If your order is 200 lbs or less, we encourage you to simply order online.  For orders over 200 lbs, please use our Request A Quote form, so we can provide a custom freight quote as well as wholesale pricing.

Most of our abrasives can be ordered online in small quantities, or ordered offline via a wholesale account.

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