The best replacement for silicate is silica.

The best alternatives to silicate are rated as following:
★★★★★  silica
★★★★  carbonate
★★★★  non silicate
★★★  sodium metasilicate
★★★  water glass
★★  mineral wool
★  zinc phosphate
★  sodium silicate
★  nonsilicate
★  perlite
  potassium silicate
  siliconate

Your alternative for silicate is not listed? Suggest!
Speaking about silicate, one probably shouldn't forget about antifreeze.

Other search terms related to silicate and their ratings are:
★★★★★ antifreeze
You have in mind a companion for silicate and it is not yet here? Propose!



Google Trends

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silicate
silica
carbonate