Urea (CO(NH2)2, CAS 57-13-6) is a white, very soluble nitrogen compound. Urea solutions include 32.5% diesel exhaust fluid (DEF/AdBlue) for SCR emissions systems, UAN and other liquid fertilizers, and feedstock for urea-formaldehyde resins and adhesives. Urea solutions crystallize in cold weather and can corrode copper and brass, so poly storage tanks are common in DEF and fertilizer service. Use the compatibility ratings to choose the right tank resin, fittings and gaskets.
HDPE is the most economical tank material for Urea, rated Excellent. Polypropylene, nylon and PVDF (Kynar®) are also rated Good or better. Avoid PVC fittings.
How Urea works with the plastics used to make our storage tanks.
| Material | Rating |
|---|---|
| HDPE | |
| Polypropylene | |
| Nylon | |
| PVDF (Kynar®) |
How Urea works with the plastics used for tank fittings.
| Material | Rating |
|---|---|
| HDPE | |
| PVC | |
| CPVC | |
| Polypropylene | |
| PVDF |
How Urea works with gasket and O-ring materials.
| Material | Rating |
|---|---|
| Buna-N | |
| EPDM | |
| Viton® |
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