Table 3.
The parameters LOI, TCI, and HBI of the substrates treated by 10%, 20%, and 27% salt and compared with no pretreatment

Pretreatment	LOI	TCI	HBI
None	1.666	1.265	0.195
10% salt	1.229	1.147	0.998
20% salt	1.254	1.161	1.000
27% salt	1.151	1.353	0.784