| Purolite manufactures two grades of Low Total Organic Carbon (TOC) resins - our standard Purolite SC (Semi-Conductor) resins and the Purolite® Picopure™ range for Ultra Pure Water (UPW) production.
For regenerable service deionisation (SDI) or portable exchange (PE) systems, where TOC readings must be less than 50 ppb after rinsing with 40 Bed Volumes (BV) or less, Purolite's SC grade resins can be used. Achieving a 50 ppb TOC level after the resins have been installed will depend on the quality of the rinse water
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All Purolite SC grade resins are cycled to remove the organic residuals that are left on ion exchange resins after manufacturing. Purolite's SC grade products are highly regenerated in the H+ and OH- forms.
Typical analyses for the various Purolite SC products are listed below.
Chemical and Physical Characteristics of Purolite® SC Grade Resins
| | C100H SC
C100x10H SC
NRW37 SC
| | A400OH SC
A300OH SC
| | NRW37 SC
NRW38 SC
| | Conversion to Ionic form, % min. | | 99.9 | | 93.5 | | - | | Chlorides, % max. | | - | | 1.0 | | - | | Bead hardness, gms min. average | | 550 | | 350 | | - | | Particle Size, +16 US std. mesh max. | | 5 | | 5 | | 5 | | Particle Size, -50 US std. mesh max. | | 0.5 | | 0.5 | | 0.5 | | Iron, ppm max. | | 50 | | 50 | | 50 | | Copper, ppm max. | | 20 | | 20 | | 20 | | Sodium, ppm max. | | 100 | | 100 | | 100 | | Lead, ppm max. | | 20 | | 20 | | 20 | | TOC Leachables, ppb max. | | 350 | | 250 | | - | | Purity, megohm-cm | | - | | - | | 18.3 |
A number of single component or mixed bed Purolite SC grade products are readily available. The mixed bed resins are blended using a 60:40 anion to cation ratio by volume, or a 1:1 chemical equivalent ratio. All mixed beds are evaluated as per ASTM D-3375-84 using a salt solution until the resin is exhausted. During the exhaustion an in-line resistivity meter records how quickly acceptable water purity is reached, and for how long it is maintained. Every batch of Purolite SC grade resin is tested to this standard. Prior to shipment these resins are guaranteed to meet 18.3 megohm-cm quality.
To review our complete range of Purolite Semi-Conductor products to determine the most appropriate resin for your particular application, please contact us.
To obtain water of the highest purity, please see our PurolitePicopure™Technical Bulletin, which provides details of this product range specifically tailored to meet the demanding requirements of Ultra Pure Water (UPW) generation.
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