Overview Silres

8/13/2019 Overview Silres

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SILRES:

PERFECT WATER REPELLENCY

FOR HEAVY CLAY PRODUCTS

INTELLIGENT INDUSTRY SOLUTIONS

S I L I C O N E S SILRES


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DISCOVER A HYDROPHOBIC

TREATMENT FOR ALL SEASONS


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Heavy clay construction materials areparticularly sensitive to weathering

and environmental effects. Their open

pores literally soak up water. Damp is

not only an ideal breeding ground for

bacteria and a vehicle for salts, but

also the start of a serious decline in

property value.

Whether in roof tiles, facing bricks orunglazed paving slabs the open-pored

structure of heavy clay ceramics allows

water to easily penetrate into the con-

struction material. That is where the

vicious circle starts. Water dissolves

salts in the clay and deposits them on

the surface as the material dries. Here

they attract more water and reinforce

the wetting process. In the long term,

this destroys the material structure and

leads to serious surface damage.

Efflorescence also spoils the optical

appearance.

Warm, humid conditions also promote

the growth of mosses, lichens and algae

on non-impregnated ceramics. Once

the process has started, it is expensive

to preserve the building fabric.

When the issue is one of not onlypreserving an immaculate appearance,

but also conserving property value and

minimizing maintenance costs, SILRES

offers an effective solution. This brochure

illustrates the potential of this silicone-

based hydrophobic masonry protection

agent for maintaining property values.

To find out more about the benefits that

WACKER can offer you, contact our

service engineers from the silicone

masonry protection team.

Contents

Perfect Weathering Protection 3

Water-Repellent, yet Breathable 4

Dipping and Spraying 6

Individually Tailored 8

Simple Tests for Success 9

WACKER at a Glance 11

Photo front page: Remmers


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SILRES: HEAVY CLAY PRODUCTS KEEP

OUT WATER BUT CAN STILL BREATHE

For over 40 years, WACKERSILICONES has been investing its

expertise in the development of

silicone-based masonry protection

agents. The result is an outstanding

range of products for rendering

mineral substrates water repellent.

Water Simply Runs OffSILRES preserves the beauty and

value of heavy clay products in the long

term. These silicone impregnation agents

make the construction material water

repellent without stopping its breathing.

As a result, water simply runs off the

surface while water vapor escapes freely.

Damp patches can easily dry out

improving the materials thermal insulation.

The frost resistance of the impregnated

material must be specially tested.

A Stable NetworkSILRES is a silicone impregnation

agent that renders the pores hydro-

phobic. It works by lining the ceramic

pores and capillaries with a stable,

three-dimensional network of silicone

resin, which forms in the masonry

surface and coatings. It is highly water

repellent and anchors firmly to the

substrate.

Natural beading effect


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Non-impregnated heavy clay products:

water penetrates from the outside,

and alkalis, salts and dirt are deposited

on the surface.

Open-pored impregnation with SILRES:

the stable silicone resin network causes

water to run off while still allowing water

vapor to escape.

Watervapor

Salts

Salts

Salts

Dirt


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SILICONE IMPREGNATION:

WEATHERPROOFING BY DIPPING

AND SPRAYING

With SILRES

, almost any heavyclay construction materials can be

weatherproofed. Silicone impregna-

tion can be applied by either dipping

or spraying.

Durable Roof TilesRoof tiles can be impregnated with

SILRES to protect against efflores-

cence, dirt and moss. This makes them

much more durable. The tiles taken

directly from the kiln at about 30 C are

dipped in SILRES BS 16. To obtain the

required penetration depth of 3 4 mm,

dipping should take from 15 seconds

to 5 minutes, depending on the porosity

of the clay tile.

Attractive FacadesSILRES-treated facing bricks remain

clean in the long term. Mortar residues

can be easily removed, while efflores-

cence and soiling are prevented, and

algal attack is delayed. The best method

is to spray the stretcher and header sur-

faces with SILRES BS 16 immediately

after firing until the impregnating agent

has penetrated to a depth of about

34mm.

SILRES by sprayingSILRES by dipping


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Clean Floor SlabsUnsintered, unglazed floor slabs are

highly susceptible to efflorescence of

internal or external salts. Spray impreg-

nation with SILRES BS 16 to a depth

of 3 5 mm prevents this in the long

term and facilitates cleaning. Special

WACKER products are available for

additional easy-care treatment.

Protection of Plant PotsPlant pots can undergo unsightly efflores-

cence of salts contained in the clay,

water or plant food. SILRES prevents

encrusted deposits, making cleaning

unnecessary. Impregnation can be carried

out by dipping or spraying.


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For optimum effectiveness in theimpregnation of heavy clay ceramics

with SILRES BS 16, the solution

strength and dip time must be opti-

mized for the individual production

conditions.

Correct DilutionTo obtain the best water repellency,

it is important always to use SILRES

in the correct strength. Dilution should

therefore be carried out according to

the clay composition and absorbency of

the product. If the concentration is too

low, water absorption is impaired. If the

concentration is too high, the potassium

carbonate by-product is deposited on

the ceramic surface. In tests, a strength

of 1: 65 has proven effective as a start-

ing point (1kg SILRES in 65 kg water).

Fast Drying

For uniform impregnation, the treated

heavy clay product should be dried by

means of infrared radiators or CO2-rich

exhaust air from the kiln. The higher the

temperature and CO2-content, the faster

the protective silicone resin network

develops. Detailed information about use

of SILRES is available from the product

data sheets and product overview,

which are available on request or can

be downloaded via the internet at:www.wacker.com/Silicones.

WATER REPELLENT TREATMENT:

INDIVIDUALLY TAILORED FOR OPTIMUM

EFFICIENCY

Water absorption of roof tiles acc. to DIN 52252: the rate at which the water-repellent agent

forms depends on the temperature and can be increased by raising the drying temperature.

SILRES BS 16

6

5

4

3

2

1

0

0.5 1 2 3 4

Drying time [hours]

Waterabsorpt

ion[wt.%]

40C

60C

80C

Easy to UseSILRES BS 16 is a concentrated,

aqueous potassium methyl siliconate,

which is diluted with water and then

applied to the ceramic by spraying or

dipping. It reacts with atmospheric carbon

dioxide (CO2) to form polymethyl silicate.

This active substance forms the water-

repellent silicone resin network. The rate

at which this process occurs depends

on the clay composition, drying temper-

ature and ventilation.

Suitable Clay Grades

The ease with which heavy clay products

can be impregnated depends on their

absorbency and alkalinity. The fired clay

should not have a pH higher than 8.

The proportion of free lime must not be

too high, since it absorbs the water

from the impregnation agent, expands

and exerts a pressure in its vicinity.


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To determine how SILRES

impreg-nation can be optimized to the heavy

clay product, a few simple tests

should be carried out. It is essential

to maintain and continually check

the set values, since the conditions

and clay quality can fluctuate.

Checking the pHThe pH of the clay must be regularly

checked as follows: finely grind 100g of

the ceramic product, take 30 g of the

powder and form a slurry in 50 g distilled

water, and close with an airtight seal.

After two days, determine the pH of the

supernatant liquid.

Testing Penetration Depth

For long-term effectiveness, the impreg-

nating agent must penetrate 3 5 mm

into the ceramic. First test version:

break the ceramic 10 20 minutes after

impregnation. The wet penetration depth

appears as a darker, moist zone. Second

test version: break the impregnated

product when it is dry. When the fracture

surface is wetted, the impregnated zone

remains dry and light colored, while

the untreated zone absorbs water and

appears darker.

Measuring the Solution StrengthThe solution strength can be checked

by titration against hydrochloric acid.

If it is too strong, water should be added.

If the solution is too weak more SILRES

should be added.

Checking the Impregnation Effect

Once the silicone resin network has

formed, the water-repellent effect can

be checked by immersing the brick in

water for 24 hours. Weigh the brick

and immerse it in water. The water level

must be 5 cm above the top of the brick.

After 24 hours, weigh the brick again.

The difference between this weight and

the dry weight in % gives the water

absorption. We recommend using control

charts to allow continuous production

monitoring.

PROCESSING:

SIMPLE TESTS FOR SUCCESS

Dependence of the impregnation effect of SILRES BS 16

on solution strength

14

12

10

8

6

4

2

0

1:50

1:75

1:100

1:125

1:150

Waterabsor

ption[p.b.w.]

Testing the solution strength of SILRES BS 16

SILRES BS 16 SILRES BS 16

Test time at room temperature [hours] Consumption of 0.1 n HCI after dilution [ml]

2421 4 6 8 10 12 14 16 18 20 22 10 20 30 40 50 60

1:65

1:98

1:130

ohnep.b.w

p.b.v


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CUSTOMER ORIENTATION IS OUR

BASIS FOR INNOVATIVE SOLUTIONS

More InformationThis brochure has shown you how

much SILRES can do for hydrophobic

treatment of heavy clay products. To

find out more about SILRES technical

data, ask for our product data sheets.

WACKER SILICONES can, of course,

offer far more in the field of masonry

protection with silicones. For our com-

plete range in this area, see our product

overview. We will be glad to send you

a copy on request. Or just visit us on

the internet at www.wacker.com.

Individual ServiceIndividual challenges require individual

solutions. That is why our technical

service engineers are here for you in

person. They understand your produc-

tion flows and requirements as well as

our products and their wide range of

talents. With this background, we can

draw up exactly the solution you need.

Just call us. We will be glad to help

you, wherever you are located.


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CREATING TOMORROWS SOLUTIONS

WACKER AT A GLANCE

Siltronicis one of the worlds leading producers of

hyperpure silicon wafers, supplying several

major chip manufacturers. Siltronic develops

and supplies wafers up to 300 mm in diame-

ter at facilities in Europe, the USA, Asia and

Japan. Wafers made from hyperpure silicon

form the basis of state-of-the-art microelec-

tronics used, for example, in computers,

telecommunications, motor vehicles, medical

technology, consumer electronics and control

systems.

WACKER SILICONES

is one of the worlds leading silicone produc-

ers. With a portfolio of over 2,000 products,

this division is number one in many global

markets. Silicones are the basis for materials

offering highly diverse product properties

for virtually unlimited applications. These are

found in a broad range of industries from

the automotive, construction and chemical

sectors, through electrical engineering, elec-

tronics, cosmetics, consumer care, pulp and

paper, and textiles, to mechanical engineering

and metal processing.

WACKERis a technology leader in the chemical and

electrochemical industries, as well as an

innovative global partner for its customers

in key sectors worldwide. Our portfolio

mix focuses on semiconductor technology,

silicone chemistry and specialty chemicals.

With some15,600 employees,WACKER

generates annual sales of around EUR 2.5

billion. Germany accounts for over

20 % of sales, Europe (excluding Germany)

for over 30 %, North America (NAFTA) for

approximately 25% and Asia Pacific +

ROW for almost 20 %. Headquartered in

Munich, Germany, WACKER has 22 pro-

duction sites worldwide and a global sales

network of over 100 subsidiaries and sales

offices.

With R&D spending at almost 6% and cap-

ital expenditures at 13% of sales, WACKER

is among the top research companies

worldwide.

WACKER SPECIALTIESis the global leader for high-quality binders

and polymer additives. Products such as re-

dispersible powders, dispersions, solid resins,

powder binders and surface coating resins

are used in the construction, automotive, and

paints and coatings industries, as well as by

manufacturers of printing inks. Additionally,

this division has expertise as a provider of

customized fine-chemical and biotechnology

solutions, including building blocks for syn-

theses in the pharmaceutical, cosmetic and

agrochemical industries.

WACKER POLYSILICON

has been producing hyperpure silicon for the

semiconductor and photovoltaics industries

for over 50 years. As one of the largest global

manufacturers of polycrystalline silicon,

WACKER POLYSILICON supplies leading

wafer and solar-cell manufacturers.


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6064/11.

04

S I L I C O N E S

Wacker-Chemie GmbH

Hanns-Seidel-Platz 481737 Mnchen

[email protected]

www.wacker.com/silres


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Overview Silres

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