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Water
hardness standard
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Total hardness
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British
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German
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ppm CaCO3
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Water Quality Grade
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0-5?
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0-4?
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0-72
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Extremely Soft
Water
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5-10?
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4-8?
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72-140
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Soft water
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10-15?
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8-12?
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140-215
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(Medium hard
water
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above15?
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above12?
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above215
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hard water
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Water Hardness Conversion
Table
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German Hardness
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British Hardness
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ppm CaCO3
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1? German 0-4?
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0-4?
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0-72
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Extremely soft water
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1? British system4-8?
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4-8?
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72-140
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Soft water
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Water quality of dyeing
water
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Total Hardness
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5?dH
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German （85ppm）
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Suspension
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?1
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mg/l
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Iron(Fe)
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?0.1
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mg/l
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Manganese(Mn)
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?0.05
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mg/l
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Copper (Cu)
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?0.01
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mg/l
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Nitrate
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?50
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mg/l
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Nitrite
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?5
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mg/l
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pH
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7-8
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Inorganic Salt
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?0.5g/l
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Conversion table of caustic soda at 20?C
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Density
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Caustic soda concentration
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Specific
gravity
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Be
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Tw
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％W/W
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g/l
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ml/l
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1.050
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6.7
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10
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4.66
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48.9
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46.6
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1.100
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13.0
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20
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9.19
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101.1
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1.160
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19.8
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32
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14.64
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169.8
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1.180
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22.0
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36
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16.44
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194.0
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1.200
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24.0
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40
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18.26
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219.0
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1.220
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26.0
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44
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20.07
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244.9
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1.240
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27.9
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48
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21.90
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271.5
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1.260
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29.7
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52
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23.28
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299.0
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1.290
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32.4
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58
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26.48
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341.6
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1.310
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34.2
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62
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28.33
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371.1
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1.330
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35.8
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66
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30.2
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401.6
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1.360
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38.2
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72
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33.06
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449.6
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330.6
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1.390
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40.5
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78
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36.00
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500.4
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1.410
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42.0
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82
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37.99
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535.6
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1.470
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46.1
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94
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44.17
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646.2
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1.500
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48.1
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100
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47.33
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710.0
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1.530
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50.0
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106
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50.50
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772.4
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Hydrogen peroxide conversion
table
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H2O2 weight percentage
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27.5%
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30%
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35%
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50%
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（20?C）Specific
gravity
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1.01
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1.114
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1.131
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1.195
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H2O2 Content of hydrogen peroxide
(g/kg）
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275
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300
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350
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500
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H2O2 Content of hydrogen peroxide（g/l）
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302
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334
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396
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598
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H2O2 volume
percentage
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27.5%
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30%
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35%
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50%
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27.5%WW
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1.00
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0.91
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0.76
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0.51
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30%WW
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1.01
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1.00
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0.84
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0.56
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35%WW
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1.31
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1.19
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1.00
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0.66
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50%WW
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1.97
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1.79
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1.51
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1.00
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H2O2 weight percentage
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27.5%
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30%
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35%
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50%
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27.5%WW
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1.00
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0.92
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0.79
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0.55
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30%WW
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1.09
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1.00
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0.86
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0.60
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35%WW
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1.27
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1.17
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1.00
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0.70
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50%WW
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1.82
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1.67
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1.43
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1.00
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Sodium
chloride specific density table
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g/l
temperature
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5
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10
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20
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30
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40
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50
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60
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70
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80
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20? C
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1.0023
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1.0058
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1.0128
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1.0198
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1.0268
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1.0338
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1.0408
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1.0478
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1.0548
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40? C
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0.9962
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0.9997
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1.0067
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1.0137
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1.0207
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1.0277
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1.0347
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1.0417
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1.0487
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60? C
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0.9866
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0.9896
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0.9956
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1.0016
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1.0076
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1.0136
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1.0196
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1.0256
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1.0316
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80? C
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0.9752
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0.9782
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0.9842
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0.9902
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0.9962
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1.0022
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1.0082
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1.0142
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1.0202
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Sodium sulfate specific
gravity meter
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g/l
temperature
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5
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10
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20
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30
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40
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50
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60
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70
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80
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20? C
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1.0034
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1.0074
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1.0154
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1.0234
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1.0314
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1.0394
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1.0478
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1.0554
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1.0634
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40? C
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0.9971
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0.0011
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1.0091
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1.0171
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1.0251
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1.0331
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1.0411
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1.0491
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1.0571
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60? C
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0.9881
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0.9926
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0.0016
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1.0106
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1.0196
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1.0286
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1.0376
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1.0466
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1.0556
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80? C
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0.9773
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0.9818
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0.9908
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0.9998
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1.0088
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1.0178
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1.0268
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1.0358
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1.0448
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