| PLA | Polylactic acid |
| aPHA | Polylactic acid/amorphous |
| PHA | Polyhydroxyalkanoate |
| CAD | Computer aided design |
| ANOVA | Analysis of variance |
| GRA | Grey relational analysis |
| GRC | Grey relational coefficient |
| ASTM | American society for testing and materials |
| H | High |
| L | Low |
| DF | Degree of freedom |
| ADJ SS | Adjusted sums of squares |
| ADJ MS | Adjusted mean squares |
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