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Tatko Brothers Slate Laboratory Test Results

Test Grey Green Red Mottled Variegated Black
Modules
of rupture
ASTM C120
Grain Orientation
Parallel to Length
12,190 psi
Grain Orientation
Parallel to Length
11,540 psi
Grain Orientation
Parallel to Length
15,160 psi
Grain Orientation
Parallel to Length
10,740 psi
Grain Orientation
Parallel to Length
9,716 psi
           
  Grain Orientation
Perpendicular to
Length
9,910 psi
Grain Orientation
Perpendicular to
Length
8,990 psi
Grain Orientation
Perpendicular to
Length
9,090 psi
Grain Orientation
Perpendicular to
Length
10,650 psi
Grain Orientation
Perpendicular to
Length
8,0169.910 psi
           
Modules
of Elasticity
ASTM C120
Grain Orientation
Parallel to Length
14,851,000 psi
Grain Orientation
Parallel to Length
14,542,000 psi
Grain Orientation
Parallel to Length
14,110,000 psi
Grain Orientation
Parallel to Length
11,185,000 psi
Grain Orientation
Parallel to Length
12,400,000 psi
  Grain Orientation
Perpendicular to
Length
13,514,000 psi
Grain Orientation
Perpendicular to
Length
12,869,000 psi
Grain Orientation
Perpendicular to
Length
13,046,000 psi
Grain Orientation
Perpendicular to
Length
13,697,000 psi
Grain Orientation
Perpendicular to
Length
N/A
       
Water Absorption
ASTM C120
0.11 %
 
0.08 %
 
0.13 %
 
0.14 %
 
0.25 %
 
       
Weather Resistance
ASTM C217
0.002 in.
 
0.002 in.
 
0.002 in.
 
0.001 in.
 
0.008 in.
 
       
Abrasion Resistance
ASTM C241
H3 = 10.2
 
H3 = 18.2
 
H3 = 9.0
 
H3 = 8.8
 
H3 = 8.7
 
       
Coefficient of
Friction
ASTM C1028
As Received
Dry = 0.76
As Recieved
Wet = 0.57
As Received
Dry = 0.86
As Received
Wet = 0.66
As Received
Dry = 0.80
As Received
Wet = 0.62
As Received
Dry = 0.79
As Received
Wet = 0.59
As Received
Dry = N/A
As Received
Wet = N/A
       
  After Cleaning
Dry = 0.75
After Cleaning
Wet = 0.58
After Cleaning
Dry = 0.85
After Cleaning
Wet = 0.63
After Cleaning
Dry = 0.78
After Cleaning
Wet = 0.63
After Cleaning
Dry = 0.78
After Cleaning
Wet = 0.59
After Cleaning
Dry = 0.79
After Cleaning
Wet = 0.8

Box 198 Route 22 A
Middle Granville, New York 12849
(518) 642-1640 or (518) 642-1600
fax: (518) 642-1886
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