Table 1. Mechanical properties and water uptake of composite specimens before and after water immersion
| Run no. | Factors | Before immersion | After 30D freshwater immersion | After 30D seawater immersion |
| P | WF | MP | TS (MPa) | MoE (MPa) | TS (MPa) | MoE (MPa) | WA (%) | TS (MPa) | MoE (MPa) | WA (%) |
| 1 | r-PP | Teak | IM | 30.0 (1.62) | 175.6 (43.28) | 25.3 (0.54) | 400.2 (32.84) | 1.90 (0.48) | 26.2 (0.57) | 408.0 (63.59) | 2.51 (0.74) |
| 2 | v-PP | Teak | IM | 29.2 (1.25) | 242.8 (56.22) | 25.9 (0.27) | 301.8 (37.11) | 2.35 (0.58) | 25.6 (1.48) | 359.2 (87.61) | 1.69 (0.41) |
| 3 | r-PP | Iron | IM | 27.3 (1.15) | 203.6 (46.37) | 24.9 (3.75) | 413.8 (106.98) | 2.22 (0.50) | 25.6 (0.69) | 338.4 (128.16) | 2.15 (0.49) |
| 4 | v-PP | Iron | IM | 26.5 (1.85) | 239.0 (50.84) | 24.3 (1.2) | 366.2 (88.44) | 2.40 (0.52) | 26.6 (0.60) | 340.4 (20.17) | 2.60 (0.51) |
| 5 | r-PP | Teak | CM | 17.0 (2.17) | 280.6 (22.13) | 16.2 (0.68) | 225.3 (21.48) | 4.89 (0.49) | 16.8 (1.67) | 266.5 (42.54) | 4.49 (0.65) |
| 6 | v-PP | Teak | CM | 20.8 (2.36) | 264.0 (24.94) | 15.9 (0.68) | 291.6 (53.17) | 11.21 (0.55) | 18.8 (0.66) | 313.2 (52.59) | 10.88 (1.50) |
| 7 | r-PP | Iron | CM | 17.0 (1.21) | 283.2 (20.66) | 15.1 (0.68) | 236.2 (64.87) | 5.51 (0.60) | 15.5 (1.38) | 226.1 (38.65) | 4.56 (0.49) |
| 8 | v-PP | Iron | CM | 21.1 (2.02) | 224.8 (70.04) | 19.2 (0.93) | 279.2 (33.52) | 9.14 (0.60) | 19.4 (2.38) | 293.7 (33.50) | 7.16 (0.81) |
Values in the parentheses are SDs.
WF: wood fibre, MP: manufacturing process, TS: tensile strength, MoE: modulus of elasticity, WA: water absorption, r-PP: recycled polypropylene, IM: injection moulding, v-PP: virgin polypropylene, CM: compression moulding.