The temperature limit is valid for permanent exposure in service, and for regeneration.
The limit of organic load corresponds to the quantity of organics passing through the resin during one run. Not all the organic matter is removed!
Another way of assessing the suitability of the resin without calculation of the organic load is to use the fouling index of the water. This fouling index is defined as:
| Resin Type | Maximum Temperature (°C) |
Maximum Organic Load g as KMnO4 per L resin |
Maximum Acceptable Fouling Index N |
|---|---|---|---|
| SBA styrenic type 1, gel | 60 | 2 | 3 |
| SBA styrenic type 2, gel | 35 | 3 | 6 |
| SBA styrenic type 1, macroporous | 60 | 4 | 6 |
| SBA styrenic type 2, macroporous | 35 | 5 | 10 |
| SBA acrylic | 35 | 8 | 15 |
| SBA Acrylic, macroporous | 60 | 15 | 18 |
| SBA nitrate selective, macroporous | 35 | 2 | 3 |
| Bifunctional acrylic | 25 | 10 | 15 |
| WBA styrenic, macroporous | 60 | 12 | 12 |
| WBA acrylic, gel | 60 | 25 | 20 |
| WBA boron selective | 40 | 5 | 6 |
The organics here are natural organic matter found in surface waters. The table is not valid for other organic impurities. Water treatment only: in some special applications, higher temperatures may be used. The ionic load of the SBA resins is not shown; the resins are assumed to operate in demineralisation cycle, i.e. regenerated with NaOH.
Sensitivity to organics and temperature may vary according to the properties of the resin, notably their porosity. However the above data can be considered as a good guideline.
The "Total Anions" value shown in the fouling index are those forming the anionic load of the resin, after degasifier if any. It is difficult to calculate for WBA/SBA couples.