Emseal 20H System : Water-Based Asphalt Emulsion

Description

Emseal 20H System is a tried and true preformed expanding foam sealant produced by impregnating permanently elastic, high density, open-cell polyurethane foam with an acrylic polymermodified, water-based asphalt emulsion. It is primarily used in below-grade applications. The architectural and engineering community has benefited from Emseal 20H System performance for over 30 years. Questions? Contact Us.

Emseal Checklist

Note:  The 20H System has been replaced for deck joint applications by the DSM System and in below-grade applications by BG System and DSM-DS.  20H System still exists in legacy specifications and for installations in below-grade, positive-side wall joints.

•  20H is a preformed expanding foam sealant produced by impregnating permanently elastic, high-density, open-cell polyurethane foam with water-based, polymer-modified asphalt.
•  Partially filling the open-cells with the impregnation and then compressing the material results in levels of sealing depending on the degree of compression.
•  Typically, approximately 5-times compression is required for watertightness in below-grade and horizontal deck applications.
•  The 20H foam is packaged precompressed in shrink-wrapped lengths (sticks).
•  It is supplied precompressed to less than the nominal material size for easy insertion into the joint.
•  Sealing between the foam and substrate is achieved through a combination of the effects of foam backpressure and the epoxy adhesive applied to the substrates and into which the 20H foam is installed.
• The exposed or outer surface of the installed 20H is further treated with Topcoat, supplied to suit the application.
•  The complete 20H System comprises three elements:
  1. the 20H foam,
  2. the epoxy adhesive, and
  3. the Topcoat. See Figure 1.

Uses and Applications:

•  As a watertight seal in joints including:
  Decks
  – structural joints
  – perimeter joints
  – roadways
  – sidewalks

Below-Grade
– foundation
– planters
– tunnels
– parapets

Limitations

•  20H System will not adhere to joints that are dirty or dust-covered or to surfaces coated with oils or release agents.
•  20H System service temperature range is -40°F to 185°F (-40°C to 85°C).
•  20H is not resistant to sustained contact with petroleum solvents,
•  oils, selected waxes, active chlorine, heavy oxidized acids or strong lyes.