Plaster grade gypsum is used primarily in the manufacture of plasterboard
PLASTER GRADE SPECIFICATION
| F.H20 (%w/w) | 5% Max |
| C.H20 (%w/w) | N/A |
| Purity (%w/w) | 92% Min |
| Soluble Salt (w/w) | N/A |
| NaCl – Mohr | 0.025 Max |
PARTICLE SIZE (%w/w)
| + 25mm | 5% Max |
| + 12.5mm | 20% Max |
| + 2.4mm | 20% Min |
| + 150 microns | 70% Min |