Rubber Black Equihardness Conversion Table
EU CROSS TABLE BLACK PEARLS 2000
 REGAL SRF - ASTM N772
 REGAL 300 - ASTM N326
 SPHERON 1416
 SPHERON 4000
 SPHERON 4700
 SPHERON 5000
 SPHERON 5000A
 SPHERON 6000
 SPHERON 6000A
 SPHERON 6400
 SPHERON SO-1A
 SPHERON SOA
 SPHERON 6400A
 STERLING 105 - ASTM N683
 STERLING 142
 STERLING SO - ASTM N550
 STERLING V - ASTM N660
 STERLING SO-1 - ASTM N539
 UNITED SRF - ASTM N772
 VULCAN 1345
 VULCAN 1380
 VULCAN 3 - ASTM N330
 VULCAN 3H - ASTM N347
 VULCAN 5H
 VULCAN 6 - ASTM N220
 VULCAN 7H - ASTM N234
 VULCAN 9 - ASTM N115
 VULCAN J - ASTM N375
 VULCAN K - ASTM N351
 VULCAN M - ASTM N339
 VULCAN P
 VULCAN XC-72
 VULCAN 10H - ASTM N134
 VULCAN 1436
 VULCAN 1391
 VULCAN N299 - ASTM N299
 CRX 1346
BLACK PEARLS 2000
   3.17 2.44 2.24 3.80 3.17 2.68 2.68 3.07 3.07 3.12 2.56 2.44 3.12 2.44 2.56 2.44 2.73 2.56 3.17 2.15 2.05 2.29 2.15 2.05 2.15 2.07 2.15 2.15 2.22 2.15 2.27 2.02 2.07 2.02 2.00 2.07 1.80
REGAL SRF - ASTM N772 0.32   0.77 0.71 1.20 1.00 0.85 0.85 0.97 0.97 0.98 0.81 0.77 0.98 0.77 0.81 0.77 0.86 0.81 1.00 0.68 0.65 0.72 0.68 0.65 0.68 0.65 0.68 0.68 0.70 0.68 0.72 0.64 0.65 0.64 0.63 0.65 0.57
REGAL 300 - ASTM N326 0.41 1.30   0.92 1.56 1.30 1.10 1.10 1.26 1.26 1.28 1.05 1.00 1.28 1.00 1.05 1.00 1.12 1.05 1.30 0.88 0.84 0.94 0.88 0.84 0.88 0.85 0.88 0.88 0.91 0.88 0.93 0.83 0.85 0.83 0.82 0.85 0.74
SPHERON 1416 0.45 1.41 1.09   1.70 1.41 1.20 1.20 1.37 1.37 1.39 1.14 1.09 1.39 1.09 1.14 1.09 1.22 1.14 1.41 0.96 0.91 1.02 0.96 0.91 0.96 0.92 0.96 0.96 0.99 0.96 1.01 0.90 0.92 0.90 0.89 0.92 0.80
SPHERON 4000 0.26 0.83 0.64 0.59   0.83 0.71 0.71 0.81 0.81 0.82 0.67 0.64 0.82 0.64 0.67 0.64 0.72 0.67 0.83 0.56 0.54 0.60 0.56 0.54 0.56 0.54 0.56 0.56 0.58 0.56 0.60 0.53 0.54 0.53 0.53 0.54 0.47
SPHERON 4700 0.32 1.00 0.77 0.71 1.20   0.85 0.85 0.97 0.97 0.98 0.81 0.77 0.98 0.77 0.81 0.77 0.86 0.81 1.00 0.68 0.65 0.72 0.68 0.65 0.68 0.65 0.68 0.68 0.70 0.68 0.72 0.64 0.65 0.64 0.63 0.65 0.57
SPHERON 5000 0.37 1.18 0.91 0.84 1.42 1.18   1.00 1.15 1.15 1.16 0.95 0.91 1.16 0.91 0.95 0.91 1.02 0.95 1.18 0.80 0.76 0.85 0.80 0.76 0.80 0.77 0.80 0.80 0.83 0.80 0.85 0.75 0.77 0.75 0.75 0.77 0.67
SPHERON 5000A 0.37 1.18 0.91 0.84 1.42 1.18 1.00   1.15 1.15 1.16 0.95 0.91 1.16 0.91 0.95 0.91 1.02 0.95 1.18 0.80 0.76 0.85 0.80 0.76 0.80 0.77 0.80 0.80 0.83 0.80 0.85 0.75 0.77 0.75 0.75 0.77 0.67
SPHERON 6000 0.33 1.03 0.79 0.73 1.24 1.03 0.87 0.87   1.00 1.02 0.83 0.79 1.02 0.79 0.83 0.79 0.89 0.83 1.03 0.70 0.67 0.75 0.70 0.67 0.70 0.67 0.70 0.70 0.72 0.70 0.74 0.66 0.67 0.66 0.65 0.67 0.59
SPHERON 6000A 0.33 1.03 0.79 0.73 1.24 1.03 0.87 0.87 1.00   1.02 0.83 0.79 1.02 0.79 0.83 0.79 0.89 0.83 1.03 0.70 0.67 0.75 0.70 0.67 0.70 0.67 0.70 0.70 0.72 0.70 0.74 0.66 0.67 0.66 0.65 0.67 0.59
SPHERON 6400 0.32 1.02 0.78 0.72 1.22 1.02 0.86 0.86 0.98 0.98   0.82 0.78 1.00 0.78 0.82 0.78 0.88 0.82 1.02 0.69 0.66 0.73 0.69 0.66 0.69 0.66 0.69 0.69 0.71 0.69 0.73 0.65 0.66 0.65 0.64 0.66 0.58
SPHERON SO-1A 0.39 1.24 0.95 0.88 1.49 1.24 1.05 1.05 1.20 1.20 1.22   0.95 1.22 0.95 1.00 0.95 1.07 1.00 1.24 0.84 0.80 0.90 0.84 0.80 0.84 0.81 0.84 0.84 0.87 0.84 0.89 0.79 0.81 0.79 0.78 0.85 0.74
SPHERON SOA 0.41 1.30 1.00 0.92 1.56 1.30 1.10 1.10 1.26 1.26 1.28 1.05   1.28 1.00 1.05 1.00 1.12 1.05 1.30 0.88 0.84 0.94 0.88 0.84 0.88 0.85 0.88 0.88 0.91 0.88 0.93 0.83 0.85 0.83 0.82 0.85 0.74
SPHERON 6400A 0.32 1.02 0.78 0.72 1.22 1.02 0.86 0.86 0.98 0.98 1.00 0.82 0.78   0.78 0.82 0.78 0.88 0.82 1.02 0.69 0.66 0.73 0.69 0.66 0.69 0.66 0.69 0.69 0.71 0.69 0.73 0.65 0.66 0.65 0.64 0.66 0.58
STERLING 105 - ASTM N683 0.41 1.30 1.00 0.92 1.56 1.30 1.10 1.10 1.26 1.26 1.28 1.05 1.00 1.28   1.05 1.00 1.12 1.05 1.30 0.88 0.84 0.94 0.88 0.84 0.88 0.85 0.88 0.88 0.91 0.88 0.93 0.83 0.85 0.83 0.82 0.85 0.74
STERLING 142 0.39 1.24 0.95 0.88 1.49 1.24 1.05 1.05 1.20 1.20 1.22 1.00 0.95 1.22 0.95   0.95 1.07 1.00 1.24 0.84 0.80 0.90 0.84 0.80 0.84 0.81 0.84 0.84 0.87 0.84 0.89 0.79 0.81 0.79 0.78 0.85 0.74
STERLING SO - ASTM N550 0.41 1.30 1.00 0.92 1.56 1.30 1.10 1.10 1.26 1.26 1.28 1.05 1.00 1.28 1.00 1.05   1.12 1.05 1.30 0.88 0.84 0.94 0.88 0.84 0.88 0.85 0.88 0.88 0.91 0.88 0.93 0.83 0.85 0.83 0.82 0.85 0.74
STERLING V - ASTM N660 0.37 1.16 0.89 0.82 1.39 1.16 0.98 0.98 1.13 1.13 1.14 0.94 0.89 1.14 0.89 0.94 0.89   0.94 1.16 0.79 0.75 0.84 0.79 0.75 0.79 0.76 0.79 0.79 0.81 0.79 0.83 0.74 0.76 0.74 0.73 0.77 0.67
STERLING SO-1 - ASTM N539 0.39 1.24 0.95 0.88 1.49 1.24 1.05 1.05 1.20 1.20 1.22 1.00 0.95 1.22 0.95 1.00 0.95 1.07   1.24 0.84 0.80 0.90 0.84 0.80 0.84 0.81 0.84 0.84 0.87 0.84 0.89 0.79 0.81 0.79 0.78 0.85 0.74
UNITED SRF - ASTM N772 0.32 1.00 0.77 0.71 1.20 1.00 0.85 0.85 0.97 0.97 0.98 0.81 0.77 0.98 0.77 0.81 0.77 0.86 0.81   0.68 0.65 0.72 0.68 0.65 0.68 0.65 0.68 0.68 0.70 0.68 0.72 0.64 0.65 0.64 0.63 0.65 0.57
VULCAN 1345 0.47 1.48 1.14 1.05 1.77 1.48 1.25 1.25 1.43 1.43 1.45 1.19 1.14 1.45 1.14 1.19 1.14 1.27 1.19 1.48   0.95 1.07 1.00 0.95 1.00 0.97 1.00 1.00 1.03 1.00 1.06 0.94 0.97 0.94 0.93 0.97 0.84
VULCAN 1380 0.49 1.55 1.19 1.10 1.86 1.55 1.31 1.31 1.50 1.50 1.52 1.25 1.19 1.52 1.19 1.25 1.19 1.33 1.25 1.55 1.05   1.12 1.05 1.00 1.05 1.01 1.05 1.05 1.05 1.05 1.11 0.99 1.01 0.99 0.98 1.01 0.88
VULCAN 3 - ASTM N330 0.44 1.38 1.06 0.98 1.66 1.38 1.17 1.17 1.34 1.34 1.36 1.12 1.06 1.36 1.06 1.12 1.06 1.19 1.12 1.38 0.94 0.89   0.94 0.89 0.94 0.90 0.94 0.94 0.97 0.94 0.99 0.88 0.90 0.88 0.87 0.90 0.79
VULCAN 3H - ASTM N347 0.47 1.48 1.14 1.05 1.77 1.48 1.25 1.25 1.43 1.43 1.45 1.19 1.14 1.45 1.14 1.19 1.14 1.27 1.19 1.48 1.00 0.95 1.07   0.95 1.00 0.97 1.00 1.00 1.03 1.00 1.06 0.94 0.97 0.94 0.93 0.93 0.81
VULCAN 5H 0.49 1.55 1.19 1.10 1.86 1.55 1.31 1.31 1.50 1.50 1.52 1.25 1.19 1.52 1.19 1.25 1.19 1.33 1.25 1.55 1.05 1.00 1.12 1.05   1.05 1.01 1.05 1.05 1.08 1.05 1.11 0.99 1.01 0.99 0.98 1.01 0.88
VULCAN 6 - ASTM N220 0.47 1.48 1.14 1.05 1.77 1.48 1.25 1.25 1.43 1.43 1.45 1.19 1.14 1.45 1.14 1.19 1.14 1.27 1.19 1.48 1.00 0.95 1.07 1.00 0.95   0.97 1.00 1.00 1.03 1.00 1.06 0.94 0.97 0.94 0.93 0.93 0.81
VULCAN 7H - ASTM N234 0.48 1.53 1.18 1.08 1.84 1.53 1.29 1.29 1.48 1.48 1.51 1.24 1.18 1.51 1.18 1.24 1.18 1.32 1.24 1.53 1.04 0.99 1.11 1.04 0.99 1.04   1.04 1.04 1.07 1.04 1.09 0.98 1.00 0.98 0.96 1.00 0.87
VULCAN 9 - ASTM N115 0.47 1.48 1.14 1.05 1.77 1.48 1.25 1.25 1.43 1.43 1.45 1.19 1.14 1.45 1.14 1.19 1.14 1.27 1.19 1.48 1.00 0.95 1.07 1.00 0.95 1.00 0.97   1.00 1.03 1.00 1.06 0.94 0.97 0.94 0.93 0.93 0.81
VULCAN J - ASTM N375 0.47 1.48 1.14 1.05 1.77 1.48 1.25 1.25 1.43 1.43 1.45 1.19 1.14 1.45 1.14 1.19 1.14 1.27 1.19 1.48 1.00 0.95 1.07 1.00 0.95 1.00 0.97 1.00   1.03 1.00 1.06 0.94 0.97 0.94 0.93 0.93 0.81
VULCAN K - ASTM N351 0.45 1.43 1.10 1.01 1.71 1.43 1.21 1.21 1.38 1.38 1.41 1.15 1.10 1.41 1.10 1.15 1.10 1.23 1.15 1.43 0.97 0.92 1.03 0.97 0.92 0.97 0.93 0.97 0.97   0.97 1.02 0.91 0.93 0.91 0.90 0.93 0.81
VULCAN M - ASTM N339 0.47 1.48 1.14 1.05 1.77 1.48 1.25 1.25 1.43 1.43 1.45 1.19 1.14 1.45 1.14 1.19 1.14 1.27 1.19 1.48 1.00 0.95 1.07 1.00 0.95 1.00 0.97 1.00 1.00 1.03   1.06 0.94 0.97 0.94 0.93 0.90 0.79
VULCAN P 0.44 1.40 1.08 0.99 1.68 1.40 1.18 1.18 1.35 1.35 1.38 1.13 1.08 1.38 1.08 1.13 1.08 1.20 1.13 1.40 0.95 0.90 1.01 0.95 0.90 0.95 0.91 0.95 0.95 0.98 0.95   0.89 0.91 0.89 0.88 0.91 0.80
VULCAN XC-72 0.49 1.57 1.20 1.11 1.88 1.57 1.33 1.33 1.52 1.52 1.54 1.27 1.20 1.54 1.20 1.27 1.20 1.35 1.27 1.57 1.06 1.01 1.13 1.06 1.01 1.06 1.02 1.06 1.06 1.10 1.06 1.12   1.02 1.00 0.99 1.02 0.89
VULCAN 10H - ASTM N134 0.49 1.53 1.18 1.08 1.84 1.53 1.29 1.29 1.48 1.48 1.51 1.24 1.18 1.51 1.18 1.24 1.18 1.32 1.24 1.53 1.04 0.99 1.11 1.04 0.99 1.04 1.00 1.04 1.04 1.07 1.04 1.09 0.98   0.98 0.96 1.00 0.87
VULCAN 1436 0.49 1.57 1.20 1.11 1.88 1.57 1.33 1.33 1.52 1.52 1.54 1.27 1.20 1.54 1.20 1.27 1.20 1.35 1.27 1.57 1.06 1.01 1.13 1.06 1.01 1.06 1.02 1.06 1.06 1.10 1.06 1.12 1.00 1.02   0.99 1.00 0.87
VULCAN 1391 0.50 1.59 1.22 1.12 1.90 1.59 1.34 1.34 1.54 1.54 1.56 1.28 1.22 1.56 1.22 1.28 1.22 1.37 1.28 1.59 1.07 1.02 1.15 1.07 1.02 1.07 1.04 1.07 1.07 1.11 1.07 1.13 1.01 1.04 1.01   1.04 0.90
VULCAN N299 - ASTM N299 0.48 1.53 1.18 1.08 1.84 1.53 1.31 1.31 1.48 1.48 1.51 1.18 1.18 1.51 1.18 1.18 1.18 1.29 1.18 1.53 1.04 0.99 1.11 1.07 0.99 1.07 1.00 1.07 1.07 1.07 1.11 1.09 0.98 1.00 1.00 0.96   0.87
CRX 1346 0.55 1.76 1.35 1.24 2.11 1.76 1.50 1.50 1.70 1.70 1.73 1.35 1.35 1.73 1.35 1.35 1.35 1.49 1.35 1.76 1.19 1.14 1.27 1.23 1.14 1.23 1.15 1.23 1.23 1.23 1.27 1.26 1.12 1.15 1.15 1.11 1.15  

Example of use: from STERLING SO (left column) to SPHERON 5000 (top row) = 1.10

BLACK PEARLS®, REGAL®, SPHERON®, STERLING®, UNITED® and VULCAN® are trademarks for carbon blacks manufactured by Cabot Corporation.

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