ESHAPOLYSEAL 1K | Elastomeric polyurethane joint sealant

ESHAPOLYSEAL 1K is a single-component polyurethane sealant, thixotropic in nature, for cold-applied sealing of secondary horizontal and vertical joints in concrete structural elements. Upon contact with atmospheric moisture, it polymerises and forms an elastic, compact mass with an elastic recovery of ≥70% in accordance with EN ISO 7389 and an elongation at break of 565% at +23°C. The Shore A hardness is 30 ± 3 and the modulus of elastic deformation remains essentially constant from –20°C to +23°C (0.21 and 0.22 MPa respectively) — meaning that the material does not harden in winter, precisely when the joint opens up the most. It bears dual CE marking: in accordance with EN 14188-2 as type S-ns-D and in accordance with EN 15651-1 as type Φ-EXT-INT-CC-25LM, i.e. low modulus with a movement capacity of ±25 per cent.

The ARGYNET View:

The crucial factor is not the sealant — it is the joint geometry. The sealing depth must be at least 70 per cent of the width and no less than 7 mm; beyond this, the material cannot accommodate deformation and tears. And the expanded polyethylene cord is not optional: if the sealant adheres to the bottom of the joint as well, it becomes bonded on three sides instead of two and fails during the first cycle of contraction.