Duration (min)

Temp. ˚C

Sulphur %

60˚C

70˚C

80˚C

90˚C

30

15

16.6

17.2

17.6

60

16.8

17.5

18.1

18.4

90

17.2

17.6

18.2

18.1

120

17.6

17.8

18.1

17.9

180

18.0

17.5

17.9

15.4

240

18.2

17.4

17.6

-

300

18.0

-

-

-