ResinTech SIR-400 is a free base form macroporous heavy metal selective weakly basic anion resin. SIR-400 has unique thiouronium functionality and is able to remove mercury and other heavy metals to very low levels (when present as divalent cations). ResinTech SIR-400 is also quite selective for noble metal cations. SIR-400 is intended for mercury removal and for removal/recovery of various precious metals, when present in cationic form. ResinTech SIR-400 is supplied in the free base form.


Polymer StructureStyrene/DVB
Polymer TypeMacroporous
Functional GroupThiouronium
Physical FormSpherical Beads
Ionic Form (as shipped)Free Base
Total Capacity>1.5 meq/mL (FB Form)
Water Retention35 to 50 percent (FB Form) 
Approximate Shipping Weight        44 lbs/cu.ft. (FB Form)
Screen Size Distribution 16 to 50 (U.S. Mesh)
Maximum Fines Content1 percent (less than 50 Mesh)
Minimum Sphericity95 percent
Uniformity Coefficient1.6 (Approximate)
Resin ColorWhite to tan

All resin/carbon purchases processed via this website will be samples only, packaged in 16oz. plastic jars.
For larger quantities please email

NOTE: Weights reflect an average packout weight over time. Actual weights may vary by +/- 1 lb.

Please allow up to 5 business days from the date of your order for processing. After processing is complete, your order will be shipped out according to the shipping option you chose when ordering. For orders being shipped outside of the USA, please allow 4 weeks due to possible delays through customs.

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