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Grown as one network — not ground from plastic

Silexa builds ion exchangers from the molecule up using sol-gel co-gelation. Instead of grafting functional groups onto a plastic backbone, we grow a silica network with the active groups built in — evenly distributed and covalently anchored.

The result behaves like the resin it replaces — same job, same process step — but its framework is mineral: it cannot swell, cannot shed plastic, and never depended on fossil feedstock.

The synthesis

Three steps, one pot

  1. 01

    Co-gelation

    A silica precursor and the functional organosilane gel together into one network — the active groups are part of the framework from the start, not coated on afterwards.

  2. 02

    Activation

    The built-in groups are converted into the active ion-exchange functions — evenly distributed and covalently anchored throughout the material.

  3. 03

    One pot, hours not weeks

    The whole sequence runs as a single-pot process that matches the performance of the slower multi-step route — synthesis time drops from weeks to hours.

Shown at marketing level by design — exact ratios, conditions, and catalysts are proprietary and shared under NDA.

Silica vs. polymer

Why the mineral framework wins

Polymer resin

Swells and shrinks with every load cycle. Beads crack, abrade — and shed primary microplastic into treated water.

Silexa silica

A rigid SiO₂ framework keeps its dimensions under every ionic load — no swelling, no bead fracture, no plastic to shed.

No swelling, no fracture, no microplastic
The rigid framework keeps its dimensions under changing ionic strength — the failure chain that grinds polymer beads into microplastic never starts.
Mineral feedstock
The backbone is silica, not fossil carbon — with a route to recycled and bio-based silicon sources.
Mild chemistry
Sol-gel synthesis runs under gentle conditions. Classic resins need concentrated sulfuric acid or Friedel-Crafts catalysts; our route needs neither.
Evenly distributed groups
Functional groups are built into the network during gelation, not grafted on afterwards — covalently anchored and evenly distributed through the material.

Characterization

Measured, not asserted

Every material is characterized across structure, composition, and performance before it carries the Silexa name:

  • Nitrogen sorption
  • Mercury porosimetry
  • Scanning electron microscopy
  • CHN elemental analysis
  • Thermogravimetry
  • Particle-size analysis
  • Acid–base titration
Scanning electron micrograph of Silexa's silica ion-exchange material, showing angular, fracture-free mineral particles
Fig. — Scanning electron microscopy of the silica framework, from our laboratory work.

Ready for technical diligence.

We share characterization data, benchmark results, and process detail with qualified partners under NDA.

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