Table 1.
Density, water absorption and thickness swelling of particleboard bonded with urea formaldehyde (UF) and different citric acid contents.
| Type | Density | WA2h | WA24h | TS2h | TS24h |
|---|---|---|---|---|---|
| Control | 692.49 ± 11.76a | 90.57 ± 3.74a | 114.92 ± 4.47a | 29.43 ± 3.77a | 44.08 ± 4.08a |
| CA10 | 699.99 ± 6.30a | 145.3 ± 5.45c | disintegrate | 136.18 ± 4.65d | 154.42 ± 3.92d |
| CA15 | 700.83 ± 10.56a | 148.03 ± 6.38c | disintegrate | 91.07 ± 3.44c | 92.2 ± 4.54c |
| CA20 | 705.61 ± 4.09a | 120.89 ± 5.51b | 137.93 ± 7.64b | 65.97 ± 2.29b | 72.75 ± 4.32b |
Note: Values after ± are standard deviations. Within the same column, means followed by the different letters a, b, c and d are significantly different at p ≤ 0.05. CA10 = 10 wt% citric acid, CA15 = 15 wt% citric acid, CA20 = 20 wt% citric acid.