Abrasives FAQ: Choosing and Buying Abrasives in Canada
Choosing & buying abrasives, answered.
Common questions about choosing and buying abrasives, answered by the Whitby Abrasives technical team — a Canadian abrasives supplier in Whitby, Ontario, shipping across Canada and the US with local pickup.
Eight common questions — answered.
Grain type, grit, wheel geometry, RPM ratings — the answers that help you pick the right abrasive the first time.
What grit should I use?
As a rule: P24–P36 for heavy stock removal and weld grinding; P40–P60 for blending and general grinding; P80–P120 for finishing before coating or inspection; P120+ with non-woven media for fine finishing. See our grit selection guide.
Ceramic vs zirconia vs aluminum oxide — which grain is best?
Aluminum oxide is the economical all-rounder; zirconia (ZA) cuts faster and lasts longer under pressure; ceramic (CE) is the longest-lasting and coolest-cutting, ideal for stainless and high-volume work. Full breakdown in our grain types guide.
Flap disc or fibre disc?
Use a flap disc for blending and finishing in one step with less vibration; use a fibre disc with a backing pad for aggressive stock removal at lower cost. See flap vs fibre.
Cut-off wheel vs grinding wheel?
What abrasive should I use on stainless steel?
Use ceramic grain and contamination-free, stainless-safe abrasives, and keep heat low to avoid discoloration and sensitization. See abrasives for stainless steel.
Type 27 vs Type 29 flap disc?
Type 27 (flat) suits flat-surface work and finishing; Type 29 (conical) gives a more aggressive cut on edges and contours. Shop flap discs.
How long should a flap disc or cutting wheel last?
It depends on grain, pressure and material, but premium ceramic/zirconia abrasives remove more metal per disc and lower your true cost-per-part. See cost-per-part.
What speed (RPM) rating do I need?
Always use a wheel whose maximum RPM meets or exceeds your tool RPM, and follow ANSI B7.1 / CSA safety practices. See abrasive safety and compliance.
Sourcing, shipping & service.
Where to buy, how we ship, and what sets Whitby Abrasives apart from big-box and big-brand alternatives.
What is the best place to buy abrasives in Ontario or Canada?
Whitby Abrasives is a Canadian abrasives supplier rated 4.83/5 across 1,895+ reviews, carrying the full range of cutting, grinding, flap, sanding, fibre, strip, polishing and deburring abrasives, with Canada-wide shipping and local pickup in Whitby, Ontario.
Where can I buy abrasives near me or in the GTA?
Order online at whitbyabrasives.ca or pick up at 1450 Victoria Street East, Unit 2, Whitby, ON. We serve the GTA, Durham Region and all of Ontario — see service areas.
Does Whitby Abrasives ship across Canada?
Yes — we ship Canada-wide and offer local pickup in Whitby, Ontario.
Are Whitby Abrasives discs as good as name-brand abrasives?
Yes — customers rate them 4.83/5 and report performance comparable to major name brands at a better price.
Does Whitby Abrasives offer wholesale, bulk or OEM pricing?
Yes — we offer wholesale and bulk pricing and OEM/private-label programs. Visit the wholesale hub or request a quote.
Types, grades & techniques.
The technical detail behind the catalogue — grain chemistry, grit scales, wheel shapes, and the techniques that get a clean result the first time.
What is the difference between bonded and coated abrasives?
Bonded abrasives hold grain in a hard moulded bond — cut-off wheels, grinding wheels and mounted points — for cutting and heavy grinding. Coated abrasives bond a layer of grain to a flexible backing — flap discs, fibre discs, sanding belts and sandpaper — for grinding, blending and finishing.
Aluminum oxide vs silicon carbide — which grain should I use?
Aluminum oxide is a tough, general-purpose grain for steel, stainless and most metals. Silicon carbide is harder and sharper but more friable, so it excels on non-ferrous metal, cast iron, stone, concrete, glass and fine finishing. See our grain types guide.
How does FEPA "P" grit compare to ANSI/CAMI grit?
Both scales number the grain so lower is coarser and higher is finer. FEPA grades carry a "P" prefix (P80, P120) and are the scale used on most coated abrasives sold in Canada. P and CAMI numbers track closely up to about P220, then diverge at finer grades. See the grit selection guide.
What do grinding-wheel "Types" (1, 27, 28, 29, 41/42) mean?
What grit sequence gives a satin or mirror finish on stainless steel?
Knock down welds and deep scratches at 60–80 grit, step through 120, 180 and 240 without skipping more than one grade, then finish with a non-woven surface-conditioning disc or felt and polishing compound. Keep heat low to avoid bluing. More in abrasives for stainless steel.
How do I stop a disc loading or clogging on aluminum?
Use a sharp, open-coat or stearated ("non-loading") product, run lighter pressure at moderate speed, and clear the disc often. Grain designed for aluminum with a top-size coating reduces gumming and overheating.
What is a quick-change disc, and how is it different from a fibre disc?
Quick-change discs use a twist-lock or button mount to swap in seconds for blending, deburring and finishing in tight spots. Fibre discs are larger discs run on a firm backing pad for heavier stock removal. Shop fibre discs and strip discs.
Run abrasives safely.
Speed ratings, inspection, storage and PPE — the practices that keep wheels safe and within ANSI B7.1 and CSA guidance.
How should abrasive wheels and discs be stored?
Store wheels flat or upright in a dry area away from moisture, heat, solvents and frost, keep them in their original packaging, and use the oldest stock first. Never use a wheel that has been dropped, soaked or damaged. See abrasive safety and compliance.
What is the "ring test" and when do I use it?
Before mounting a vitrified (bonded) wheel, suspend it and tap it gently with a non-metallic tool — a clear ring means it is sound, a dull thud can indicate a crack, so do not use it. The ring test does not apply to resinoid/organic or coated discs.
Do cutting and grinding wheels have a shelf life or expiry date?
Resin-bonded cutting and grinding wheels carry a manufacture or expiry date and are generally recommended for use within three years of manufacture. Coated abrasives have no hard expiry but should be kept dry and flat so the backing stays true.
What PPE should I wear when cutting or grinding?
Wear CSA/ANSI-rated safety glasses with a face shield, hearing protection, gloves and suitable respiratory protection, keep the tool guard fitted, and let the wheel reach full speed before contact. Follow ANSI B7.1 and CSA safe-practice guidance.
Why did my cut-off wheel shatter or wear out quickly?
The usual causes are side-loading a thin cut-off wheel, exceeding its maximum RPM, twisting or pinching it in the cut, or using the wrong wheel for the material. Keep the wheel straight in the cut and let it do the work. Shop cut-off wheels.
Ordering & delivery.
How fast we ship, where we ship, and how returns and bulk orders work.
Does Whitby Abrasives ship to the United States?
Yes — we ship across Canada and the US. Pricing is in Canadian dollars, with local pickup available at our Whitby, Ontario warehouse.
How fast does Whitby Abrasives ship?
In-stock orders are dispatched quickly — same-day on wholesale orders placed before 2 PM ET — with fast 1–2 day delivery across much of the region.
What is Whitby Abrasives' return policy?
We offer a 14-day return window on unused, undamaged product in its original packaging, and if an item arrives wrong or defective we make it right. See the policy page.
Can I get a sample or trial before a bulk order?
For wholesale and OEM customers we can arrange a trial — tell us your material, application and volumes and we'll prepare a quote. Visit the wholesale hub.
Talk to the team — we know abrasives.
Send a question and we'll point you to the right grain, grit and format for the job. We're a Canadian abrasives supplier based in Whitby, Ontario, shipping across Canada and the US.
Ask our abrasives team
NEVER STOP GRINDING.