Hydrophobic Expanded Silicate Rock Granules

The water repellent ROTOCELL PLUS® range is manufactured by processing ROTOCELL® in a patented hydrophobising process.  The hydrophobic surface treatment allows the use of the product in a wider range of applications and provides increased energy efficiency when used in insulation applications.Weight reduction and low water absorption are two of the other key benefits.


    • Hydrophobised natural expanded silicate rock granules

    • Six standard size fractions are available between 0.04-4.0 mm

    • Bulk density of between 0.30-0.54 g/cc.

    • Beige body colour.

    • Ultra low thermal conductivity.


    • Lightweight aggregate.

    • High compressive strength.

    • Excellent heat and sound insulation.

    • High breathability.

    • Low water absorption.

Typical Applications

    • Plasters and mortars.

    • Fine concrete.

    • Construction chemicals.

    • Facing panels and lightweight panels. Fire and noise protection panels.

    • Insulation products.

    • Filles.

    • Plastics.

    • Filtration media.

    • Biological carriers.

    • Refractory aggregate.

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 /