Technical Data

Hartstone adheres to ATSM standards, so you can have maximum confidence in your space

See Our Test Results

Technical Data

Hartstone adheres to ATSM standards, so you can have maximum confidence in your space

See Our Test Results

Hartstone Testing Information

< 4%

Water Absorption

(ASTM C140)

> 6,500 PSI

Compressive Strength

(ASTM C140)

 0.75

Solar Reflectivity (SRI)

(ASTM C1549)

 < 1%

Freeze-Thaw

Less than 1% loss of dry weight // 50 cycles
(ASTM 1260)

We have 10+ years of experience installing in freeze-thaw conditions without failure or material degradation.

ASTM C39 | Compressive-Strength

ASTM C170 | Compressive Strength

ASTM C99 | Modulus of Rupture

ASTM C1195 | Absorption

ASTM C1028 | Coefficient of Friction

ASTM E 1980 | Color #0 SRI

ASTM E 1980 | Soft White #2 SRI

Keep Hartstone looking great for a lifetime

How to Care for Hartstone