|
|
| • | 1. Drying chamber: The test is performed in a walk-in environmental testing chamber. The chamber should be sufficiently spacious to contain all test specimens and weighing instruments. The operator should be able to take measurements within the chamber. Air in the chamber should be maintained at 23±2°C and 50±4% relative humidity (RH). Air-flow rate past the specimens should meet ASTM C157: 5.4 Standard specifications. |
| • | 2. Hygrometer: During testing, 2-3 hygrometers should be placed near the specimens to monitor local relative humidities. Digital hygrometers are recommended. |
| • | 3. Balance: The balance for weighing the specimens should have a capacity of = 1500g and a repeatability of = 0.01g. It should be mounted on a proper support (Figure 1) within the drying chamber. |
| • | 4. Device for weighing specimens in water: A device should be devised for the operator to weigh the specimens in water (Figure 11.8). |
Figure 11.8 – Balance and device for weighing specimens in water within the drying chamber
Web site: http://www.simcotechnologies.com/
