Waterproofing Membranes, Isothane EM Range

EMA Elastomeric

technical service


Our EMA elastomeric membrane product is a solar reflective, liquid applied coating based on urethane prepolymers.

Manufactured to cure by reaction with atmospheric moisture to give a continuous film which is rubbery and elastic. It contains leafing aluminium which gives excellent U.V. resistance. EMA is a very high solid coating designed to give a high-build film. It is applied by brush but it has a higher viscosity than a conventional paint and should not be diluted.

EMA cures to a permanently flexible seamless membrane that, by virtue of its chemical reactivity in the wet state, has good adhesion to a wide range of substrates. Unlike more traditional bitumen based products, EMA does not readily embrittle with age, exposure to ultra violet radiation or weathering, and hence it does not crack or craze. It is not adversely affected by extremes of temperature consequently it does not crack at low temperatures or suffer thermal flow at elevated temperatures.

EMA can be applied by brush, squeggee or roller without the need to mix, stir or heat before application.

EMA is also available as a spray grade which is applied using airless spray equipment.

Isothane elastomeric membranes are designed to bond to many types of substrate particularly those commonly used as roofing, such as felt, asphalt, slate, tiles, asbestos, concrete, brick, wood, glass and metals. They can also be applied to spray polyurethane (pu) foam insulation. However, it is essential that the substrate and structures are properly prepared, and stable.


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Technical Data

Storage, Handling and Personal Protection

The recommendations in our Safety Data Sheet for this product must be followed at all times. More general information is included in our publication “A Guide to the Safe Handling of Polyurethane Chemicals” and in the following Technical Data Sheets which are available on request:

  • Fire safety when Storing, Handling and Installing Polyurethane Foam.
  • Decontamination of Isocyanates using Isothane Decontaminant.
 Typical Properties  EMA
 Solids % min  95
 Abel closed cup flashpoint º C  56
 Application limits º C  5 – 70
 Approximate Dry Time (20ºC, 50% RH)  12 – 20 hrs touch dry, 7 days full cure
 Elongation % (ASTM D412)  450
 Tensile Strength MN/m² (ASTM D412)  2.07
 Accelerated Weathering (ASTM 953)  12000hrs no appreciable deterioration
 U/V Resistance ( European Conditions )  Excellent
 Hydrolysis Resistance  Excellent
 Resistance to Industrial Environments  Excellent
 Mechanical Damage  Good
 Storage Stability (temperateclimate)  6 months
 Penetration by Fire & Surface Spread of Flame Resistance (BS476: Part 3)  EXT.F.AA.
 Glass Transition Temperature ºC (RAPRA)  -30



Structural Waterproofing

Our high performance structural waterproofing products offer heavy duty resistance to ponded water & UV light.


Case Studies

EMA Roofing

Client: Austin Reed, Thirsk Contractor: McConnell Seamless Roofing Problem: The existing silicone system on a 6000m² roof had started to...


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General Enquiries

Tel: +44 (0)1254 872555Email: info@isothane.com

Sales Enquiries

Tel: +44 (0)1254 872555Email: sales@isothane.com

Technical Enquiries

Tel: +44 (0)1254 872555Email: technical@isothane.com

Prepolymers & Export Enquiries

Tel: +44 (0)1254 872555Email: international@isothane.com


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