Table 1.
Formulae of flame retardant rigid polyurethane foams (RPUFs) a.
| Samples | FR Ratio (%) | ATH (g) | AO (g) | BH (g) | EG (g) | 450L (g) |
|---|---|---|---|---|---|---|
| Neat RPUF | 0% | -- | -- | -- | -- | 72.0 |
| 8ATH/14B/6E/PU | 8%ATH/14%BH/6%EG | 19.1 | -- | 33.5 | 14.3 | 43.0 |
| 14ATH/14B/6E/PU | 14%ATH/14%BH/6%EG | 35.5 | -- | 35.5 | 15.5 | 43.0 |
| 8AO/14B/6E/PU | 8%ATH/14%BH/6%EG | -- | 19.1 | 33.5 | 14.3 | 43.0 |
| 14AO/14B/6E/PU | 14%ATH/14%BH/6%EG | -- | 35.5 | 35.5 | 15.5 | 43.0 |
| 19.6B/8.4E/PU | BH:EG 14:6 | -- | -- | 46.3 | 20.1 | 43.0 |
| 28ATH/PU | 28%ATH | 78.0 | -- | -- | -- | 72.0 |
| 28AO/PU | 28%AO | -- | 78.0 | -- | -- | 72.0 |
a Catalyst 6.2 g, 141b 14.4 g, and polyphenylpolymethylene isocyanate (PAPI) 108 g in every formula. 450L: polyether polyol; ATH: aluminum hydroxide; AO: aluminum oxide; BH: [bis(2-hydroxyethyl)amino]-methyl-phosphonic acid dimethyl ester; EG: expandable graphene.