ESHAPRIMER 21 | Single-component polyurethane primer
Joint sealing and waterstopsDescription
ESHAPRIMER 21 is a single-component polyurethane protective varnish, designed to enhance the adhesion of polymer sealants to all porous substrates. It is a clear, yellowish liquid with a density of 0.95 ± 0.05 g/cm³ and a Brookfield viscosity of just 110 cPs at 25°C — meaning it penetrates the porous substrate rather than forming a surface film that would act as a release layer. After polymerisation, it forms a uniform, hard yet elastic membrane. It is used as a primer prior to polyurethane, acrylic and hybrid sealants, as a primer for polyurethane, acrylic, hybrid and epoxy coatings, as anti-corrosion protection for metal surfaces, and to enhance the adhesive properties of ESHATAPE bituminous tapes.
The ARGYNET View:
The primer is the most underestimated cost in a waterproofing project — and the most expensive when omitted. ESHAPRIMER 21 is not an optional addition to ESHAPOLYSEAL 1K: the sealant’s Technical Data Sheet and Declaration of Performance specify it as a required primer. Sell them together, or you risk being held responsible for any failure.
Overview
Key Features
Adhesion & Membrane
- Low viscosity 110 cPs (Brookfield, 25°C) — deep penetration into porous substrates
- Forms a uniform, hard and elastic protective film
- Enhances the adhesion of polyurethane, acrylic and hybrid-based polymer sealants
Compatibility
- Compatible with polyurethane, acrylic, hybrid and epoxy systems
- Suitable for concrete, timber and plaster
- Enhances the adhesive properties of ESHATAPE bituminous tapes
Protection
- Corrosion protection for metal surfaces (≥2 coats)
- Protection and priming of porous concrete surfaces
Where it is used
Technical solutions where this material is used.
