Thermal Insulators
A thermal insulator is one that does not conduct heat readily and is used for either heat conservation or personnel protection.
Good thermal insulators are:
| Asbestos Cloth | Balsa Wood | Calcium Silicate |
| Cork | Cotton Wool | Diatomaceous Earth |
| Expanded Polystyrene | Fiberglass | Glass Wool |
| Mineral Wool | Laminated Plywood | Polyurethane Foam |
| Rock Wool | Rubber | Sawdust |
Electrical Insulators
| Plastics (Thermoset and Thermoplastics) | Glass | Transformer Oil |
| Quartz | Ceramics | Natural and synthetic rubber |
| Hard rubber | Silicone rubber | Shellac |
