Keraflex Extra S1 Zero is Mapei’s benchmark high-performance cementitious adhesive for trade fixers who need one bag to cover both technique and tile format. Its variable rheology is the headline feature: mix to a thixotropic paste (26–28 parts water per 100 parts grey powder) for a C2TES1 no-slip mortar that holds large-format tiles dead flat on walls without dripping, or let it down to a fluid consistency (32–33 parts water) for C2ES1 extended open time and maximum wetting of the tile back — ideal for porcelain and natural stone where 100% contact is non-negotiable.

Deformable to S1 class (>2.5mm transversal deformation per EN 12004), Keraflex Extra S1 Zero absorbs the movement in problem substrates and large-format installations that rigid adhesives can’t handle. Low Dust technology keeps the mixing area cleaner and the site tidier, extended open and adjustment times reduce pressure on the tools, and an 8-hour pot life means less wasted product at the end of the day. Formulated with very low VOC emissions and CO2 offset across its life cycle for specifiers working to sustainability criteria. Available in grey for standard contract work and white for light natural stone and premium finishes where a grey adhesive would show through or discolour the joint.

Key specs: C2TES1 / C2ES1 to EN 12004 | deformable S1 | internal & external, floor & wall | coverage approx. 1.2 kg/m² per mm thickness | 20kg bag | pot life up to 8 hours | grey & white.