Samples Average of  Bp(1) Average of  Bp(2) Average 1,2 Difference 1,2 S.D%
Coal tar 317.464 317.445 317.464 0.019 0.006
Petroleum asphalt KP 419.702 419.707 419.705 0.002 0.001
Coal asphalt 340.506 340.602 340.554 0.048 0.014
Petroleum residue 397.227 392.705 394.966 2.261 0.572
Ethylene residue 306.420 306.094 306.257 0.163 0.053
Table 4: Standard Deviation (S.D.%).