From the Quarry
Platinum Silverstone is a quarry-direct supplier of Ottawa Platinum — a premium Canadian limestone sourced exclusively from our Class A–licensed Ontario site. We extract and supply domestic and export-grade blocks for natural stone fabricators and slab producers.
Trusted by architects, designers, and restoration specialists, Ottawa Platinum is ideal for residential, commercial, institutional, and heritage projects. Its architectural-grade surface qualities make it exceptionally suited to both exterior and interior applications — delivering natural beauty, structural integrity, and supply at scale.
Millions of years in the making.
Nature’s blueprint — designed for legacy & built to last.
Specifications & Performance Data
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Water Absorption Percentage: 0.29
Bulk Density g/cm: 2.74
Abrasion Resistance: 42
Compression Strength (Psi) - Dry: 25700
Compression Strength (Psi) - Wet: 26630
Modulus of Rupture (Psi) - Dry: 4307
Modulus of Rupture (Psi) - Wet: 3513
Flexible Strength (Psi) - Dry: 3139
Flexible Strength (Psi) - Wet: 2717
Freeze Thaw - Durability Factor @ 8 Cycles Percentage: 100
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Bushhammered: 40
Honed: 11
Polished: 11
Brushed: 14
Sandblasted: 25
Our limestone invites imagination and responds to design with integrity.
Crafted by nature and refined for architectural expression, Ottawa Platinum delivers consistency, character, and performance. From landmark restorations to modern design statements, the stone brings vision to life with permanence.