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Technical Data for Buckingham-Virginia Slate

PropertyTest MethodValue
Classificationmacroscope / microscopeblue-black, micaceous, fine grain slate
AbsorptionASTM C1210.104%
Bulk DensityASTM C97174.4 lb/ft3
Compressive StrengthASTM C17025,800 lb/in2
Modulus of RuptureASTM C12013,000 lb/in2
Modulus of ElasticityASTM C120, IITRI7,014,000 lb/in2
ToughnessIITRI56 in-lb/in2
Flat Slab StrengthRP 4774840 lb load
Coefficient of Thermal ExpansionASTM E2280.0000062 in/in/°F
Coefficient of FrictionIITRI
Natural Cleft:

Dry

0.730.69

Wet

0.730.69
Sand Rubbed:

Dry

0.780.74

Wet

0.800.74
Abrasive ResistanceASTM C24113.2 Ha 5-6 nonn’s
Fire ResistanceIITRI1800°F bloat non-combustable
Acid ResistanceASTM C2170.0018 in
Weather ResistanceASTM C215 IITRI29% modulus loss-10% strength loss
DurabilityRP 4770.004% weight loss-10% strength loss
Life Expectancyobservation of existing structuresno visible deterioration or fading apparent