Difference between revisions of "Silica gel, commercial"
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* Mh is the average amount of water (in grams) that is gained or lost by 1 kilogram of silica gel for each 1% change in RH. This is determined by repeatedly cycling silica gel between adsorption and desorption within a specific RH range until a constant value is measured. By taking hysteresis into account, MH reflects actual buffering performance. | * Mh is the average amount of water (in grams) that is gained or lost by 1 kilogram of silica gel for each 1% change in RH. This is determined by repeatedly cycling silica gel between adsorption and desorption within a specific RH range until a constant value is measured. By taking hysteresis into account, MH reflects actual buffering performance. | ||
| − | == | + | Table 1: specific moisture reservoir (g/kg for a 1% RH change) at 20°C * |
| − | + | {| class="wikitable" | |
| − | + | |- | |
| + | ! rowspan="2" | Moisture sorbent | ||
| + | ! MH 50 ± 10% | ||
| + | ! M 20 → 30% | ||
| + | ! M 60 → 50% | ||
| + | ! | ||
| + | ! | ||
| + | |- | ||
| + | | RH around 50% | ||
| + | | Keep RH low | ||
| + | | Keep RH high | ||
| + | | Temp exhibit case in room with good to moderate climate control | ||
| + | | Maintenance-free exhibit case | ||
| + | |- | ||
| + | | RHapid Gel | ||
| + | | 6.11 ± 2.16 | ||
| + | | 4.48 ± 0.42 | ||
| + | | 4.38 ± 1.40 | ||
| + | | 2 kg/m3 | ||
| + | | 4 kg/m3 | ||
| + | |- | ||
| + | | PROSorb | ||
| + | | 5.42 ± 1.32 | ||
| + | | 4.37 ± 0.10 | ||
| + | | 4.25 ± 0.38 | ||
| + | | | ||
| + | | | ||
| + | |- | ||
| + | | Art-Sorb | ||
| + | | 4.04 ± 0.80 | ||
| + | | 2.84 ± 0.47 | ||
| + | | 4.18 ± 0.49 | ||
| + | | 4 kg/m3 | ||
| + | | 8 kg/m3 | ||
| + | |- | ||
| + | | Arten Gel | ||
| + | | 5.7 | ||
| + | | 5.5 | ||
| + | | | ||
| + | | | ||
| + | | | ||
| + | |- | ||
| + | | Regular density silica gel (clear, type A) | ||
| + | | 1.93 ± 0.44 | ||
| + | | 5.48 ± 0.40 | ||
| + | | 1.47 ± 0.16 | ||
| + | | 9 kg/m3 | ||
| + | | 18 kg/m3 | ||
| + | |- | ||
| + | | Orange silica gel | ||
| + | | 1.16 ± 0.26 | ||
| + | | 4.92 ± 0.59 | ||
| + | | 0.94 ± 0.14 | ||
| + | | | ||
| + | | | ||
| + | |- | ||
| + | | Bentonite clay (Desi Pak) | ||
| + | | 1.19 ± 0.07 | ||
| + | | 2.25 ± 0.03 | ||
| + | | 1.11 ± 0.02 | ||
| + | | | ||
| + | | | ||
| + | |- | ||
| + | | Molecular sieves 4A (zeolite) | ||
| + | | 0.33 ± 0.02 | ||
| + | | 0.47 ± 0.04 | ||
| + | | 0.31 ± 0.01 | ||
| + | | | ||
| + | | | ||
| + | |} | ||
==Resources and Citations== | ==Resources and Citations== | ||
[[Category:Materials database]] [[Category:MWG]] [[Category: Climate/Environment]][[Category: Comparisons]] | [[Category:Materials database]] [[Category:MWG]] [[Category: Climate/Environment]][[Category: Comparisons]] | ||
Revision as of 11:53, 20 July 2023
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Description
The moisture adsorbing properties of silica gels are affected by factors such as capillary pore size or the inclusion of hygroscopic salts, resulting in a wide range of performance. Therefore, it is important to compare the buffering capacity of different types of silica gels to determine which silica gel has the best performance for a specific application. Thomson (1977) described the specific moisture reservoir with the variable M.
- The moisture buffering capacity of a material is defined by its M value, which is the amount of water (in grams) that is gained or lost by 1 kilogram of silica gel for each 1% change in RH.
- Mh is the average amount of water (in grams) that is gained or lost by 1 kilogram of silica gel for each 1% change in RH. This is determined by repeatedly cycling silica gel between adsorption and desorption within a specific RH range until a constant value is measured. By taking hysteresis into account, MH reflects actual buffering performance.
Table 1: specific moisture reservoir (g/kg for a 1% RH change) at 20°C *
| Moisture sorbent | MH 50 ± 10% | M 20 → 30% | M 60 → 50% | ||
|---|---|---|---|---|---|
| RH around 50% | Keep RH low | Keep RH high | Temp exhibit case in room with good to moderate climate control | Maintenance-free exhibit case | |
| RHapid Gel | 6.11 ± 2.16 | 4.48 ± 0.42 | 4.38 ± 1.40 | 2 kg/m3 | 4 kg/m3 |
| PROSorb | 5.42 ± 1.32 | 4.37 ± 0.10 | 4.25 ± 0.38 | ||
| Art-Sorb | 4.04 ± 0.80 | 2.84 ± 0.47 | 4.18 ± 0.49 | 4 kg/m3 | 8 kg/m3 |
| Arten Gel | 5.7 | 5.5 | |||
| Regular density silica gel (clear, type A) | 1.93 ± 0.44 | 5.48 ± 0.40 | 1.47 ± 0.16 | 9 kg/m3 | 18 kg/m3 |
| Orange silica gel | 1.16 ± 0.26 | 4.92 ± 0.59 | 0.94 ± 0.14 | ||
| Bentonite clay (Desi Pak) | 1.19 ± 0.07 | 2.25 ± 0.03 | 1.11 ± 0.02 | ||
| Molecular sieves 4A (zeolite) | 0.33 ± 0.02 | 0.47 ± 0.04 | 0.31 ± 0.01 |