| Hence magnesium and sulphur combine under the action of pressure, forming magnesium sulphide and possibly a polysulphide. |
| Presently, only the polysulphide materials exhibit significant radiopacity due to their lead dioxide content. |
| The new products are MS sealant, which is environment-friendly, polysulphide sealant and structural glazing alkoxy silicone sealant. |
| Alternatively, sulphur dioxide or sodium polysulphide can be used. |
