Technical Data Sheet
RHOPLEX™ EC-3100
Acrylic Emulsion Polymer for Elastomeric Roof Coating Basecoats
Introduction
RHOPLEX™ EC-3100 is an all-acrylic polymer designed for use in pigmented elastomeric roof
coating basecoats to provide adhesion to weathered thermoplastic polyolefin (TPO) roofing
membranes. When applied to a suitably cleaned, weathered TPO roof, and topcoated with a
durable acrylic elastomeric topcoat, a basecoat with RHOPLEX™ EC-3100 can extend the life of
the existing roof. Coatings based on RHOPLEX™ EC-3100 are an excellent choice for use over
TPO roofing membranes that have been weathered at least four years. For optimal adhesion and
water resistance, RHOPLEX™ EC-3100 should be used as a basecoat and formulated with the
recommended dispersants and pigments listed in the sample starting point roof coating formulation
ARM-3100-1. The technology used in RHOPLEX™ EC-3100 enables coatings made from this
binder to have very good adhesion and resistance to blistering when applied to weathered TPO.
Advantages
When properly formulated and applied, coatings based on RHOPLEX™ EC-3100 polymer offer the
following advantages:
• Adhesion to weathered TPO roofing membrane
• Resistance to blistering under extended moisture conditions
• Flexibility at temperatures as low as -15ºF (-26ºC)
• 50 g/L VOC (volatile organic compound) formulations
• Compatibility with RHOPLEX™ EC and Lipacryl™ based commercial roof coating topcoat
formulations (ARM91-1, ARM2885-1, APC2540-1, ARM3640-1)
• Easy application and cleanup with soap and water
Application
Aqueous roof coatings based on EC-3100 should not be applied:
• When temperatures fall below 5°C (40°F) or are expected to fall below 5°C (40°F)
• When temperatures are expected to fall below the dew point within 6 hours of application
• At very high (>90%) relative humidity or when rain is expected
• On roofs collecting ponded water; the National Roofing Contractors Association considers ponding
water on any type of roof unacceptable (see the NRCA Roofing and Waterproofing Manual)
Typical Physical Properties
These properties are typical but should not be considered specifications.
Appearance
Milky white liquid
Solids content, % wt
54.5-55.5
pH
9.8-10.5
Density, lbs/gal
8.66
Glass transition temperature, -40
Tg (onset), °C
Brookfield viscosity, cPs
<500
(spindle 3, 60 rpm)
Formulation
Guidelines
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Contact your local Dow representative for suggested starting point formulations and related information.
®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow
RHOPLEX™ EC-3100 / Dow Construction Chemicals
September 2010
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The Dow Chemical Company
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215-592-3000
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®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow
RHOPLEX™ EC-3100 / Dow Construction Chemicals
Form No. 832-00042X-0910P&M
September 2010