Sample No.

Additional content of thiourea (%)

Formaldehyde content (%)

Solids content
(%)

Formaldehyde content after 30 days (%)

L1

0.5

1.17

41.5

1.23

L2

1.0

1.09

40.7

1.36

L3

1.5

1.18

41.8

1.83

L4

2.0

1.12

44.2

1.30

L5

3.0

1.14

42.2

1.32