Silica-Free Sandblasting Media: Types, Selection and Safety
Silica-Free Sandblasting Abrasive
Silica-free sandblasting media is an engineered abrasive that delivers aggressive cutting action without the respirable crystalline silica that makes traditional blasting sand a health hazard. It is the standard abrasive Ocean Pacific Media Blasting runs, which is why sandblasting on an Ocean Pacific job does not involve sand.
If you are the one scoping the work, that swap changes two things: what comes off the surface, and what goes into the air. Silica-free media still strips heavy rust, thick coatings, and deeply embedded surface contamination, and it is still the abrasive to reach for when a substrate needs a strong profile ahead of repairs, coatings, or refinishing.
Sandblasting sits at the aggressive end of the media Ocean Pacific runs. If you already know blasting is the answer and you want the work scoped, our industrial sandblasting services cover the full job. This page is about the media itself — what it is, what it does to a surface, and how to pick the right one.
Why Use Silica-Free Sand for Blasting
Silica-free sandblasting media is selected for projects that require deep cleaning and strong material removal without the hazards associated with airborne silica. Key advantages include:
- Aggressive cutting action for tough surfaces
- Effective removal of heavy corrosion and buildup
- Suitable for large-scale and industrial projects
- Safer alternative to traditional silica sand
The last bullet is the one that follows a project past the job site. Traditional silica sand shatters on impact and releases respirable crystalline silica dust, and inhaling that dust over time causes silicosis, an incurable lung disease. In British Columbia it is a regulated silica dust hazard, with substance-specific requirements in the provincial OHS Regulation.
Blasting silica-free takes that exposure pathway off your site rather than managing it — a silica-generating process running on your property is a liability you inherit, and this removes it. Our crews are WHMIS-trained and certified in confined space entry, fall protection, hazardous materials handling, and first aid, and Ocean Pacific carries full insurance and a strong WCB record.
Common Silica-Free Sandblasting Applications
Silica-free sandblasting is used across many industries and surface types, including:
Heavy Rust and Thick Paint Removal
Removes severe rust, scale, and multiple layers of paint from steel and metal surfaces.
Concrete and Pipe Cleaning
Cleans concrete, pipes, and structural components by removing buildup, coatings, and surface contamination — the approach we took on the Wellington Elementary concrete sandblasting project.
Metal Frame and Structural Stripping
Strips metal frames, beams, and fabricated components in preparation for repair or recoating. At Coastland Mills in Nanaimo we sandblasted the mill’s steel log bunks to remove coatings, corrosion, and contamination so the structures could be inspected before recoating.
Industrial and Farm Equipment
Restores heavy equipment by removing corrosion, grease buildup, and failed coatings.
Boats and Watercraft
Used on steel and aluminum marine components where strong rust and coating removal is required. For the Canadian Coast Guard in Victoria, that included ship parts, anchoring equipment, shore facilities, and roughly 400 feet of tug boat chain.
Sandblasting is one tool in a larger kit, and part of the job is knowing when to put it down. The projects below were not sandblasting jobs — the substrate could not take an aggressive abrasive, so we changed media. Aluminum oxide stripped eight layers of epoxy from the Olympic-size pool at CFB Esquimalt, and crushed glass cleaned century-old fir beams in Yaletown. A controlled process suited to exposed heritage wood restored approximately 13,000 square feet of timber framing at the Vancouver Salt Building, and dry ice combined with crushed glass handled the industrial smoke remediation at the Diavik Diamond Mine in the Northwest Territories.
How to Choose the Right Sandblasting Media
The right abrasive is the one that removes the contamination and leaves the profile your coating system needs, without damaging the substrate underneath. Four properties decide it, and this is how we weigh them:
- Particle size and grading. Coarser media cuts faster and leaves a deeper profile; finer media gives a tighter, smoother finish. Grading is matched to the coating spec, not chosen by habit.
- Hardness. Abrasive hardness is described on the Mohs scale of mineral hardness, a 1-to-10 ranking where talc sits at 1 and diamond at 10. Harder media removes tougher buildup but is less forgiving on soft or thin substrates.
- Recovery and reuse. Some abrasives can be recovered and run again across multiple passes; others are used once, so collecting and handling spent media becomes a line in the scope.
- Silica content. This is the one that is not a trade-off. Silica-free is our default whenever we sandblast.
Here is how the media we run compare in practice:
| Media | Best for | Trade-off |
|---|---|---|
| Silica-free sandblasting | Aggressive removal, heavy corrosion, large-scale metal prep | Too aggressive for delicate or thin substrates |
| Garnet blasting | Fine, consistent profiles on metal; precision work | Slower and higher cost than sand |
| Crushed glass blasting | Broad range of substrates; recycled, low-dust abrasive | Higher cost; slower than aggressive sand |
| Soda blasting | Fire and smoke cleanup, deodorizing, soft metals like brass and aluminum | Not suited to heavy industrial removal |
| Dry ice blasting | Sensitive substrates and equipment; leaves no secondary waste | Non-abrasive — will not cut heavy rust or scale |
| Kleen Blast / metal slag | Rust, steel hulls, concrete, vehicle frames, industrial equipment | Recovery is limited, so plan for spent-media handling |
Matching those variables to your substrate, your coating system, and your finish requirement is where the job is won or lost — and it is the conversation we would rather have before the quote than on site.
Surface Preparation for Long-Term Performance
Beyond cleaning, silica-free sandblasting creates a surface profile — a controlled roughness that lets paints, coatings, and protective linings mechanically key to the substrate. Proper profiling is what makes a coating bond correctly and hold up over the long term, and it is why metal sandblasting belongs in the scope ahead of recoating in industrial and marine environments rather than being treated as an optional cleaning step.
Get the profile wrong and the coating fails early, whatever it cost. Get it right and the next trade starts on a surface that is clean, profiled, and to the spec they are working to.
Sandblasting Media: Common Questions
What is sandblasting?
Sandblasting is an abrasive blasting process in which media is propelled at high pressure against a surface to strip away rust, paint, corrosion, mill scale, and other contamination, leaving a profiled substrate ready for coating, welding, inspection, or repair. It sits at the aggressive end of the blasting methods Ocean Pacific runs, which is why it is the one we reach for when heavy buildup has to come off.
What is used instead of sandblasting sand?
Modern sandblasting sand is not sand. Ocean Pacific runs engineered silica-free abrasives that cut aggressively without producing respirable crystalline silica dust. Where a substrate needs a gentler touch, we switch to garnet, crushed glass, soda, or dry ice rather than dialling back the sand.
Is sandblasting dangerous?
The traditional method carries a real occupational hazard: silica sand dust causes silicosis, and crystalline silica is a regulated workplace hazard in British Columbia. Blasting with silica-free media removes that exposure pathway. Handled by trained operators with the correct media, pressure, and containment, blasting is a controlled process. Ocean Pacific’s crews are WHMIS-trained and certified in confined space entry and hazardous materials handling.
Have questions about a project or ready to get started?
Send us three things — the substrate, what is on it, and the coating spec it has to take — and we will tell you which media the job calls for and what the scope looks like. Ocean Pacific Media Blasting is mobile: we come to your site across BC, Alberta, Manitoba, the Northwest Territories, and Alaska.
Call 1-855-297-3337, 8:00 am to 8:00 pm PST, seven days a week, or get a free quote and we will take it from there.
