Expanded Silicate Rock Powder

ROTOBASE® is the finest fraction of expanded silicate mineral powder offered by ROTEC®.  The material is processed using a unique screening and treatment process developed in-house.

These fine silicates react with the calcium hydroxide liberated during the hydration of cement to produce caclium silicate hydrates. This leads to an improvement in the physical properties of all cement based construction products whilst offering a reduction in weight.


    • Natural expanded silicate rock flour.

    • Three standard size fractions are available: 0.0-0.04 mm, 0.0-0.09 mm and 0.0-0.3 mm.

    • Bulk density of 0.58 g/cc.

    • Beige body colour.

    • Mohs Hardness of 3.


    • Very lightweight.

    • High breathability.

    • Pozzolanic.

    • Non-flammable.

    • Odourless.

Typical Applications

    • Plaster.

    • Mortar.

    • Fine concretes.

    • Lightweight building panels. Fire and sound proofing panels.

    • Insulation products.

    • Plastics.

    • Polishing agent.

    • Cosmetic products.

Featured grades with technical datasheets

A brief overview of the key grades is given below. You will find the Technical Datasheets (TDS) available for download. If you are looking for a Safety Datasheet (SDS) or Product Safety Information (PSI) then please get in touch by phone or via the contact buttons at the top of the page.

Should you not find what you are looking for here then please note that we have further grades available besides these. One of our Technical Sales team will be happy to help. All of the sales team are technically qualified and will be able to advise you on which product to choose. You can either call us, email us or fill in a quick form at the top of the page to get us to call you (Request a Callback). A sample can be requested via the button at the top of the page as well. Please note that by providing us with your contact details, you are agreeing for us to potentially contact you.

Related brochures & technical literature

You will find some of the key product brochures available for download below. There are more brochures available upon request. If you would like to discuss your enquiry further then please get in contact by phone or by filling in the "Request a Callback" form at the top of the page. Someone from the technical sales team will then call you within 24 hours, to discuss your project further.

ROTEC General Product Overview Brochure

An overview brochure looking at the features and benefits of the expanded silicate rock powder products from ROTEC®.

ROTEC General Product Overview Brochure Brochure /




ROTEC® Guide Formulation Overview

An overview of the guideline formualtions available upon request for the ROTEC® expanded silicate rock powders.

ROTEC® Guide Formulation Overview Brochure /