Dow Construction Chemicals
Formulating two-component cementitious
waterproofing membranes
PRIMAL™ AS-8012 Styrene Acrylic Emulsion Polymer
Next
generation
environmentally
advanced
binder
Long-term protection
of building structures
Version March 2014
Dow Construction Chemicals
Introducing PRIMAL™ AS-8012 Styrene Acrylic Emulsion Polymer
– Dow’s latest generation of binders specially
designed to support durable waterproofing
– Offering high flexibility and elongation
as well as tensile strength
– Supporting long-term protection of building
structures
– Helping to raise construction
and environmental quality
A watertight approach to polymer development
Whether it’s protecting concrete and masonry substrates
from wet weather conditions, surface water splash, ground
moisture ingress or the destructive action of soluble salts,
responsible building designers and owners want to ensure
the best possible defences.
Critical requirements of two-component cementitious
waterproofing membranes:
– Flexibility: crack bridging
– Water impermeability: water tightness
– Adhesion to concrete
– Low water absorption
Such performance benefits have led to their widespread use
in applications such as waterproofing wet areas, basement
walls, swimming pools, balconies, facades terraces and wastewater drains. Flexible systems are also used as protective
surface-coatings for concrete structures.
The importance of polymer choice
Highly flexible cementitious waterproofing membranes,
applied with a brush, roller or spray cure to form a flexible
coating preventing water penetration and providing crackbridging.
Key to the performance capabilities of the final membrane
are the technical characteristics of the polymer which must
provide essential properties to the waterproofing mortar
including adhesion at the mortar-substrate interface and act
as an effective binder to hold together filler particles.
Performance requirements
Cementitious membranes are expected to offer excellent
resistance to water and long-term weathering, even when
permanently exposed. High water vapour permeability helps
avoiding issues such as blistering, and high toughness and
scratch resistance offer durability. The systems must be easy
to apply, even on complex, uneven surface shapes, and result
in fully-bonded surfaces with no joints.
2 – PRIMAL™ AS-8012 Styrene Acrylic Emulsion Polymer
Polymers act as the binder to bring adhesion, flexibility and
water resistance to waterproofing membranes – which are
core requirements for such systems. Effective polymers must
therefore offer:
– Good film formation behaviour: suitable emulsion
polymers deflocculate particles which results in a tight,
non-porous, film
– Stability in cement-based mixtures
– Wet mortar properties (ease of application)
– Water and alkali resistance
– A good balance between flexibility and tensile strength
– Low glass transition temperature (Tg)
Today’s market also demands materials with a good
environmental profile alongside effective product
performance.
PRIMAL™ AS-8012 Acrylic Emulsion
Polymer – performance features and benefits
PRIMAL™ AS-8012 Acrylic Emulsion Polymer has been
designed to offer manufacturers of two-component,
cementitious waterproofing systems an excellent balance of
performance features and mechanical properties.
This next generation polymer imparts high flexibility,
elongation and excellent crack-bridging ability.
PRIMAL™ AS-8012 also helps the formulation of membranes
with market-leading environmental performance and
compatibility with key construction standards, including
potable water applications.
Supporting potable water certification
A sample two-component, cementitious, flexible
waterproofing membrane containing PRIMAL™ AS-8012 was
certified as compliant with BS 6920: Part 2: 2000 “Suitability
of non-metallic products for use in contact with water
intended for human consumption with regard to their effect
on the quality of the water” (including high temperature tests
up to 50°C in accordance with BS 6920: Part 3: 2000).
Formulation recommendations and a BS 6920: Part 2
compliance letter are available in order to help producers
meet regulatory requirements.
Environmental performance
Features
Benefits
ü Balanced mechanical
properties
ü Imparts high tensile strength as well as
elongation
ü Tailored polymer design
ü Good water and alkali resistance
ü Specifically designed
for waterproof coating
ü Supports formulation of a final product
with excellent impermeability and crack
bridging performance
ü Excellent powder
compatibility
ü Improved formulation stability and
workability compared to previous polymers
PRIMAL™ AS-8012 Styrene Acrylic Emulsion Polymer is APEOfree 1) and formaldehyde-free 2), and has very low Volatile
Organic Content (VOC), helping manufacturers to fulfil
required product standards without compromising on their
commitment to the environment.
Production and packaging
PRIMAL™ AS-8012 Styrene Acrylic Emulsion Polymer is
produced at Dow’s expanded manufacturing site in the Jebel
Ali Free Zone (JAFZA), a state-of-the-art facility producing
speciality products. The product is available in drums and in
bulk.
Typical Properties
Appearance
Milky White
Polymer Type
Styrene acrylic
Solid, by weight, %
56
pH
6
MFFT, °C
<0
Tg
Viscosity (LV_S3; 30rpm; 25°C)
For more information on how you could benefit
from PRIMAL™ AS-8012 Styrene Acrylic Emulsion
Polymer in your two-component, cementitious, flexible
waterproofing systems, contact your local Dow sales
representative or visit www.dowcc.com.
-8
<1100
Please note that the values shown are typical values for your guidance. They are not to be taken as
specifications and are subject to certain variability. Please consult the sales specifications for details.
Supporting standards
Selecting the right polymer is vital in the production
of qualified waterproofing materials that can meet key
standards in the sector.
European standard EN 14891-2007: covering liquid applied
water impermeable products for use beneath ceramic tiling
bonded with adhesives PRIMAL™ AS-8012 has been designed
to help achieve required performance standards in classes
O (external application, crack-bridging capability at low
temperatures) and P (swimming pool application, resistant to
contact with chlorinated water).
1) APEO is not intentionally added and is not knowingly introduced from another raw material
2) Made without formaldehyde or formaldehyde-generating materials and does not release formaldehyde under normal operating conditions. Dow however does not routinely analyze PRIMAL™ AS-8012 for
formaldehyde or any other substances that are not listed in the Safety Data Sheet or Sales Specification
®™ Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow.
3
About Dow in the Middle East
Dow has a longstanding relationship with the Middle East beginning
with the establishment of manufacturing and commercial facilities in
the United Arab Emirates more than 35 years ago. Since then, Dow
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industry, partnering with leading regional companies to set up stateof-the-art petrochemical complexes across the region. For 17 years,
Dow and Petrochemical Industries Company K.S.C. (PIC) of Kuwait
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South Africa, 3620
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responsible for determining whether products and the information in this document are appropriate for Customer’s use and for ensuring that Customer’s workplace and disposal practices are in compliance with
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Form No. 840-02501-0314
®™ Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow.
Version March 2014