LIQUID APPLIED MEMBRANESThe modern way of water-proofing

Polymer dispersions as barrier to water and wetnessLiquid applied membranes (LAMs) represent easy-to-use water based compoundsSynthomer binders boost the waterproofing ability and drying time of LAMsHigh relevance in several contexts, e.g. basements, flooring, roofing and bathroomsSynthomer range contains multiple binders coupled with tried and tested starting formulations

The key to keeping water and dampness outWater proofing of buildings started as early as 5000 BC, when the Egyptians used bitumen coated lead for damp proof membranes. Today there are different technologies available for liquid applied membranes (LAM) and damp proof membranes (DPM). Most of the LAMs are used under tiles to protect water sensitive substrates from moisture and damp in wet rooms (e.g. bathrooms) or in roofing applications.applications.

Synthomer is a specialist supplier of water based binders and has introduced a range of XSBR, HS-SBR and Acrylic dispersions for water proofing systems such as flexible concrete, bitumen, LAM/DPM, etc. These polymers set the market standard for 1K-membranes and comply with all market requirements and standards like: ETAG 022, DIN EN 14891, BS, ABAA, AN/NSZ 4858:2004, ABP, ANSI 118.10 and ANSI 118.12ANSI 118.12

Polymer dispersion based liquid applied membranes/damp proof membranes offer an easy way of water proofing and vapour proofing.

Properties of liquid applied membranesThese systems can be characterized as follows:

• single pack system• waterbased compounds that can be applied even on damp substrates• non-toxic, non hazardous, solvent and plasticiser free•• well balanced mechanical properties: tough but with high flexibility, high percentage elongation and good crack bridging properties• low water vapour permeability• non staining and stain blocking• environmentally friendly (free of solvents)• low odour• p• protects moisture-sensitive substrates• good adhesion to all mineral construction materials, substrates containing plaster as well as heated floors and chip boards

The use of Synthomer dispersions improves membrane properties like:

• excellent water proofing• quick d• quick drying (typically touch dry in 1 hour)• seamless sealing• good performance as primer for adhesives• crack bridging• low VOC• alkali resistant, can be applied to alkaline surfaces• resistant to silage acids

In bathrooms and beyondApplication areas1k-membranes are applied during construction in several areas of buildings, some of which are listed as follows.

Floors: Under or above screeds to provide a damp proof membrane.Basements:Basements: As part of a waterproofing system beneath ground level.Walls: Under renders or plasters as water barrier or vapour barrier.Roofs: As the main waterproofing coating or as part of a repair system. (Protection from UV is recommended.)Tiling:Tiling: As secondary protection under tiles in wet areas e.g. bathrooms, food processing areas, balconies, etc.Water storage: Tests show that the membranes perform well even when continuously immersed in water.Silage storage: The membrane protects concrete from silage attack.

Formulation of 1k-membranes and applicationLiquidLiquid applied membranes are based on an advanced styrene butadiene latex or styrene acrylic dispersion that is formulated with fillers, pigments, fibers and film control agents. It is water based and typically no solvents and plasticisers are needed.

Preparation of the substrateTheThe substrate should be smooth or have a light even texture. Any masonry (e. g. bricks) should be flush pointed and defects in existing surfaces have to be repaired prior to application of the membrane.

The surface needs to be clean, sound and free of dust, loose material, or free surface water. The membrane should not be applied in wet conditions or where these conditions are likely to occur before the membrane has dried. The membrane should not be applied when the temperature of the substrate, or the air temperature, is below 7ºC.

OnOn the other hand it is advantageous to pre-wet dry concrete or masonry surfaces so that these are damp but free from any water glistening on the surface. Because of the wide variety of substrates and site conditions it is always advisable to check adhesion to the substrate by testing on a sample area before starting any job.

ApplicationTheThe membrane may be applied by brush, roller or airless spray. If necessary the compound can be diluted with up to 10% water. However, care should be taken to ensure that the correct dry coat thickness is applied.

Meet the Synthomer binders for your 1k-membraneThe thickness of the dried membrane per coat depends on the method of application. For a single dry coat thickness of more than 0.3 mm it is recommended that the membrane be applied by airless spray. If airless spray is used, single dry coat thicknesses of up to 1mm can be obtained. (Note: A single coat of 0.6 mm dry thickness or more will require a greater drying time than for an equivalent multicoat application.)application.)

If two coats are being applied it is recommended that the coats is applied at right angles to each other.

Before applying the second coat it is necessary to let the first coat become touch dry. The time required to reach this touch dry condition will vary according to site conditions but will typically be in the order of 1 hour. It is preferable if the second coat is applied within 24 hours of applying the first coat. After all coats have been applied, the membrane should be left for at least 4 days before attempting any pondingponding tests. Under unfavourable drying conditions this period may need to be extended.

In some situations e.g. at high stress points such as wall/floor junctions it is beneficial to use fabric (scrim) reinforcement. Such reinforcement is available in many types and local availability will often influence choice. Fabric made from polypropylene or polyester is suggested. Fabric made from natural fibres should be avoided.

SSynthomer polymers for liquid applied membranesTheThe right polymer is key to develop qualified waterproofing materials. Therefore the Synthomer range contains different binders, which have been designed to offer specific advantages for producers of 1k-membranes, including high tensile strength, good water and alkali resistance, as well as excellent crack bridging performance and elongation properties.

Lipaton SB 47B40*TheThe market standard, and well known all over the world: Carboxylated styrene-butadiene latex with excellent strength properties, high resistance to liquid water and water vapour, high blush resistance and excellent adhesion to multiple construction substrates. Lipaton SB 47B40 shows excellent stability with dry-add inorganic fillers and sets quickly into a low tack, high strength, water resistant film.film.

Lipaton SB 60B11*Latest development with low VOC and odour.

Revacryl AE 3020Styrene Acrylic dispersion for interior and exterior application.

For special applications please contact our Technical service staff who may give additional recommendations.

*These products contain an antioxidant.

Product name Formulation

Lipaton SB 60B11

Lipaton SB 47B40

Revacryl AE 3020

Notes: *Data describe typical properties - not product specifications

2011-1711

2011-1708

2011-1220

Elongation [%]

410.0

300.0

500.0

Tensile strength [N/mm²]

3.2

3.0

3.0

Water uptake [%]

9

18

23

Adhesion to Concrete [N/mm²]

> 1.0

> 1.0

0.8

Membrane properties*

Product Solid Content [%]1 pH value2 Viscosity [mPa*s] Tg [°C] MFFT [°C]

Lipaton SB 60B11

Lipaton SB 47B40

Revacryl AE 3020Notes: 1According to ISO 3251 2According to ISO 976 3According to ISO 2555 (Brookfield) 4According to ISO 3219 *Data describe typical properties - not product specifications

50.0

50.0

50.0

9.5

9.5

7.5

2403

1803

2504

7

7

-2

0

0

0

Emulsion properties*

One of many quick start guides

1

2

3

4

5

6

77

8

Additional starting formulas available on request through our Technical Service team.

Liquid applied membrane based on Lipaton SB 60B11

Ingredients

Lipaton SB 60B11

Blanc fixe N

Durcal 5

Titanium dioxide (Rutil 611)

Colanyl blue

Etingal S

RRohagit SD 9523

Alkaline, adjust pH to 9.3-9.5, 20% solution

Supplier

Synthomer

Sachtleben

Omya GmbH

Sachtleben

Clariant

BTCSpeciality

SSynthomer

47.00

34.00

16.00

1.50

0.40

0.50

0.600.60

100.00

pbw

America, Europe and South East Asia. In March 2017, we acquired the coalescing agents and Butyl Ethyl Propanediol (BEPD) business from Perstorp Oxo Belgium AB. The newly acquired businesses significantly improve our footprint to a number of speciality markets which we will continue to serve through a strong network of local technical service and sales branches, supported by regional application dedevelopment and production in our key markets. We deliver the right formula, globally, individually.

Synthomer is one of the world’s leading suppliers of emulsion and speciality polymers supporting leadership positions in many market segments including coatings, construction, technical textiles, adhesives, paper and synthetic latex gloves. The company has its Head Office in London (UK) and provides customer focused services from operational centres in Harlow (UK), Marl (Germany), Kuala LumpurLumpur (Malaysia), Shanghai (China) and Dubai (UAE). In June 2016 we have acquired the Monomers, Dispersions and Powders business (MDP) from Hexion with dedicated production sales and customer service facilities in North

Disclaimer: This information and any other advice or recommendations given or made by us (collectively “Information”), are provided in good faith and are not intended to, nor do they, constitute professional advice or services. Information is provided “AS IS” and on an “AS AVAILABLE” basis and without warranty. We do not warrant or accept responsibility for the accuracy, timeliness or completeness of the Information, or for the suitability of the Information for a particular purpose. We do not accept responsibility, and exclude all liability (including(including under any implied warranties), for any matters arising out of or in connection with your reliance on the Information (including as to infringement of third party intellectual property rights) to the fullest extent permitted by law. Any Information concerning any possible use or application of Synthomer products is given by us in good faith; we do not warrant the fitness of any Synthomer products for any particular purpose and it is entirely for you to satisfy yourself fully as to the suitability of Synthomer products for any particular purpose. purpose. Synthomer products are sold in accordance with Synthomer’s standard terms and conditions of sale which are available from www.synthomer.com/tc.

Group Head OfficeSynthomer plc45 Pall MallLondon SW1Y 5JGUnited Kingdom

info@synthomer.com

Operational Centre EuropeSynthomer Deutschland GmbHWerrastraße 1045768 MarlGermany

europe.construction@synthomer.com

www.synthomer.com

Leading in emulsionsand speciality polymers