Tensile strength and flame-retardance of soft segment modification, hard segment modification, and soft-hard segment modification systems.
| Properties (content of flame retardant) | WPU-OP | WPU-HF | WPU-F6 | WPU-OD | WPU-OPF6 | WPU-HFF6 | WPU-OPOD | |
|---|---|---|---|---|---|---|---|---|
| LOI (%) | (15 wt%) | 33.1 | 34.2 | 30.2 | 30.6 | 30.4 | 36.6 | 31.4 |
| (5 wt%) | 23.4 | 29.1 | 26.4 | 29.6 | 29.4 | 31.7 | 30.4 | |
| UL-94 | (15 wt%) | V-0 | V-0 | V-0 | V-1 | V-0 | V-0 | V-0 |
| (5 wt%) | V-0 | V-0 | V-1 | V-1 | V-0 | V-0 | V-1 | |
| Tensile strength | (15 wt%) | 2.1 | 10.4 | 12.6 | 9.3 | 14.8 | 7.5 | 5.0 |
| (5 wt%) | 12.6 | 17.8 | 8.2 | 2.1 | 16.1 | 12.0 | 9.3 | |