Note	The physical and chemical properties vary somewhat depending on whether the sample being tested is buff or grey, wet or dry, or contains more or less mottling.  The following tests are representative averages.

Limestone Category	Absorption by Weight percent	Compressive Strength p.s.i.	Modulus of Rupture p.s.i.
Low density Medium density High density	12 7.5 3	1800 4000 8000	400 500 1000

WEIGHT

(Dry) - 2,435 kg/m3

SPECIFIC GRAVITY

2.44

COMPRESSIVE STRENGTH - (ASTM C-170-50)

(average) - dry - 62.8 M Pa (average) - wet - 64.8 M Pa

TRANVERSE STRENGH

1,340 p.s.i.

SHEAR STRENGTH

1,056 p.s.i.

MODULUS OF RUPTURE - (ASTM C-99-52)

(average) - dry - 9.9 M Pa     (average) - wet - 5.2 M Pa

WATER ABSORPTION - (ASTM C-97-47)

(average) 3.49% Ratio of absorption per cent:

1 hour - 1.335 2 hours - 2.499 Under pressure - 4.653 Pore Space - 11.36%

MODULUS OF ELASTICITY

41.37 G Pa

COEFFICIENT OF THERMAL EXPANSION

Per C - 5.4 x 10-6 mm per mm

THERMAL RESISTANCE

102m2C W (90 mm thick stone - stone only - no allowance made for film effect)

LIGHT REFLECTANCE

Split Face - 70% Cut Stone - 82%

SOUND RATING

N.B.C.C. class II (Sound Reduction Factor - 90mm thick stone - 42 decibels)

REFERENCES

Frank H.T. Rhodes

1962: Life Of The Past; Fossils: A Guide to Prehistoric Life; Golden Press New York