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Low modulus
polyurethane
sealant for joints
WHERE TO USE
Mapeflex PU S15 is a sealant specifically developed
for sealing internal and external vertical expansion and
construction joints.
Mapeflex PU S15 complies with EN 15651-1 standards
(sealants for internal and external facade elements) and
has a declared performance rating of F-EXT-INT CC
(including in cold climates).
Mapeflex PU S15 is classified F - 25 LM according
to ISO 11600 standards.
Some application examples
Sealing internal and external joints with movements
due to compressive loads and expansion of up to 25%
the average width of joints in:
• facades on civil and industrial buildings;
cartridges for use with a manual or pneumatic
silicone gun.
Thanks to its particular consistency, application and
finishing of the sealant in vertical joints from 5 to 40 mm
is quick and easy.
Before painting over Mapeflex PU S15 it must be fully
polymerised. We recommend using elastomeric paint
such as Elastocolor Paint after treating the surface of
the sealant with Colorite Performance.
Always carry out preliminary tests to make sure the
sealant and paint are compatible.
RECOMMENDATIONS
• Do not use on dirty, greasy, stained or loose
substrates.
• precast concrete panels;
• Do not apply on damp or wet substrates.
• general sealing work in the building industry where
thixotropic sealant is required.
• Do not apply on bitumen substrates.
TECHNICAL CHARACTERISTICS
Mapeflex PU S15 is a one-component, low modulus,
thixotropic polyurethane sealant developed by the
MAPEI Research & Development laboratories.
Mapeflex PU S15 polymerises by reacting with the
moisture in the surrounding air or substrate and, thanks
to its special characteristics, remains highly durable
over the years.
The product is ready to use and is supplied in 600 ml
• Do not apply if the surrounding temperature or the
temperature of the substrate is lower than +5°C.
• The original colour may fade if exposed to UV rays.
APPLICATION PROCEDURE
Preparation of the substrate
All surfaces to be sealed must be dry and compact and
must have no traces of dust, slurry, oil, form-release
compound or old paint. To make sure the sealant
functions correctly, the size of the joint must be
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TECHNICAL DATA (typical values)
PRODUCT IDENTITY
Classification according to EN 15651-1:
F-EXT-INT CC
Consistency:
thixotropic paste
Colours available:
off-white, grey 113 (cement grey); other colours
available on request
Density (g/m³):
1.47± 0.07
Dry solids content (%):
100
Brookfiled viscosity at +23°C (mPa·s):
700,000 ± 100,000
(spindle F - 5 RPM)
APPLICATION DATA (at +23°C and 50% R.H.)
Recommended application temperature:
from +5°C to +35°C
Dust dry:
140 mins.
Full hardening time:
2 mm/24 hours - 3 mm/48 hours
FINAL PERFORMANCE (after 28 days at +23°C)
Shore A hardness (DIN 53505):
20 ± 0.3
Compressive strength (DIN 53504S3a) (N/mm²):
2
Elongation at failure (DIN 53504S3a) (%):
1,000
In-service temperature range:
from -40°C to +70°C
Resistance to UV rays:
yellowing of pale colours
Movement when in service (%):
± 25
Classification according to ISO 11600:
class E - 25 LM
Modulus of elasticity at +23°C (ISO 8339) (N/mm²):
0.19
Springback (ISO 7389) (%):
> 85
dimensioned according to the width/depth
ratio in the table below.
WIDTH/DEPTH RATIO
width of joint
depth of sealant
up to 10 mm
equal to the width
from 10 to 20 mm
always 10 mm
from 20 to 40 mm
equal to the half
the width
The sealant must only stick to the sides of the
joint without touching the bottom.
To obtain the correct depth for the sealant
and prevent it sticking to the bottom of the
joint, press a length of Mapefoam closedcell, foam polyethylene cord down into the
joint. Mapefoam is available in a range of
diameters depending on the width of the joint
to be sealed.
Mapeflex PU 15 has the capacity of
compensating movements of up to ± 25%
the width of the joint.
To prevent sealant going along the edges
of the joint and to get a perfect finish to
the sealant, we suggest applying masking
tape along the edges of the joint and then
removing it immediately after smoothing over
the surface of the sealant.
Mapeflex PU S15 adheres well to absorbent,
compact, clean, dry substrates even if primer
is not applied on the surface beforehand.
We suggest applying Primer M on loose
substrates and on substrates that are
subjected to high deformations or immersion
in liquids for prolonged periods.
We recommend using Primer M on
absorbent materials with high residual
moisture content. We also recommend
using it on non-absorbent substrates such
as metal, steel, aluminium, copper, ceramic,
glass and galvanized or painted steel sheet.
Application of Primer M
Brush-apply a thin, even coat of Primer M
one-component polyurethane primer for
absorbent and non-absorbent substrates.
The sealant must only be applied when the
primer is dry to the touch (after around
40 minutes at +23°C and 50% R.H.)
Preparation and application
of Mapeflex PU S15
Use a manual or pneumatic silicone gun for
600 ml cartridges.
Extrude the quantity of sealant required into
the joint without entraining air.
Consumption
Consumption depends on the width and
depth of joint to be sealed.
See the table below for approximate
consumption figures:
YIELD PER 600 ML CARTRIDGE
section of sealant
in mm
meters per 600 ml
cartridge
5x5
24
10 x 10
6
15 x 10
4
20 x 10
3
25 x 12.5
1.9
30 x 15
1.3
Smoothing the sealant
To get a perfect finish and guarantee the
functionality of the sealant, remove any
excess product and smooth over the surface
with a suitable tool dipped in soapy water.
Cleaning
Remove Mapeflex PU S15 from the
edges of joints, tools and hands before it
polymerises with toluene or alcohol. After
curing, hardened sealant must be removed
mechanically or with Pulicol 2000.
Packaging
Boxes of twenty 600 ml cartridges.
Colours available
Mapeflex PU S15 is available in off-white
and grey 113 (cement grey). Other colours
are available on request.
Storage
Mapeflex PU S15 may be stored for up to
12 months in a cool, dry place (+5/+25°C 50% R.H.).
SAFETY INSTRUCTIONS FOR
PREPARATION AND APPLICATION
Mapeflex PU S15 is hazardous and may
cause sensitization if inhaled. When applying
the product, we recommend the use of
protective gloves and goggles and to take
the usual precautions for handling chemical
products. We recommend working in well
ventilated areas when applying the product.
In case of poor ventilation, we recommend
wearing the mask. In case of contact with the
eyes or the skin wash immediately with plenty
of water and seek medical attention.
For further and complete information about
the safe use of our product please refer to
the latest version of our Material Safety Data
Sheet.
PRODUCT FOR PROFESSIONAL USE.
WARNING
Although the technical details and
recommendations contained in this product
data sheet correspond to the best of our
knowledge and experience, all the above
information must, in every case, be taken as
merely indicative and subject to confirmation
after long-term practical application; for
this reason, anyone who intends to use the
product must ensure beforehand that it is
suitable for the envisaged application. In
every case, the user alone is fully responsible
for any consequences deriving from the use
of the product.
Please refer to the current version of the
Technical Data Sheet, available from our
website www.mapei.com
All relevant references
for the product are available
upon request and from
www.mapei.com
440-9-2014 (GB)
Any reproduction of texts, photos and illustrations published
here is prohibited and subject to prosecution
(GB) A.G. BETA
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BUILDING THE FUTURE