Although typically more expensive than the standard C2 adhesive, S1 and S2 adhesives are designed to cope with movement within a substrate and ultimately preventing the final surface (aka tiles) from de-bonding or cracking.

High-performance deformable cementitious adhesive with no vertical slip and extended open time for ceramic tiles, particularly recommended for laying large porcelain and natural stone tiles (thickness of adhesive from 3 to 15 mm).

May 4, 2017 · Adhesives classed C2 may well have some flexural properties because you do need a reasonable addition of polymer to achieve the C2. The official start for the flexibility/deformability test starts with the S1 which is greater than 2.5mm of flex and then the S2 is greater than 5mm flex.

Sep 11, 2020 · Adhesives that are able to meet the deformability range of between 2.5 and 5 mm are classified S1, adhesives that have a deformation of ≥ 5 mm are classified S2. Deformability test shows how flexible the adhesive is.

The lightweight deformable adhesive to make tilers’ work easier. Ideal for installing large format tiles. One-component, high-performance, deformable, lightweight, cementitious adhesive with no vertical slip and extended open time, with extremely high yield.

What does S1 and S2 mean? In simple terms deformability means how much a solid, for example a cementitious tile adhesive, can change shape when a force is applied. S1 and S2 categories are normally achieved with additional polymer modification of cementitious tile adhesives and is associated with the tile adhesive being ‘flexible’.

BAL SPF S1 is a highly flexible, S1 classified standard-setting tile adhesive for walls and floors, offering users an extended open time of 30 minutes and pot life of 5 hours. BAL SPF S1 is recommended for fixing most types of tile, large format wall tile and areas of total immersion in water such as swimming pools and showers.

Sep 15, 2022 · Discover the contrasting characteristics of S1 and S2 adhesives in this insightful comparison. Learn about their unique properties, bond strength, and suitability for various applications. Uncover which adhesive type is the ideal choice for your project’s requirements and achieve superior results.

Jul 16, 2023 · S1 and S2 categories are normally achieved with additional polymer modification of cementitious tile adhesives and are associated with the tile adhesive being “flexible”. BS 5384: Part 4:2015 advises that: “S2 classified adhesive and unbonded screeds are not suitable in heavily trafficked areas”.

S1 flexible adhesives are mandatory for porcelain tiles with very low water absorption, larger formats (e.g. 30 x 60 cm) and where tiles are laid on critical substrates, such as gypsum plasterboards, floor heating and tile-over-tile applications.