Sand storing time | Untreated (%) | Punctured (%) | Peeled (%) |
1 - 5 th | 0 | 0 | 0 |
6th | 0C | 5.4 ± 0.9B | 13.2 ± 1A |
7th | 3. 2 ± 1.2C | 82.7 ± 4.2B | 91.3 ± 2.9A |
8th | 33.4 ± 2.8C | 92.2 ± 2.1B | 98.1 ± 1.7A |