MAPEFLEX PU 40
Polyurethane sealant with a low modulus of elasticity
WHERE TO USE
Mape ex PU40 has been developed for sealing expansion and contraction joints in horizontal and vertical surfaces.
Mape ex PU40 is classi ed as F - 25 LM according to ISO 11600 Standard
Mape ex PU40 complies with Euronorm EN 15651-1 (“Sealants for façade elements”) with performance rating F-EXT-INTCC and EN 15651-4 (“Sealants for pedestrian walkways”) with performance rating PW-EXT-INT-CC
Some application examples
Sealing internal and external expansion and distribution joints subject to movement up to 25% in: façades on civil and industrial buildings;
• pre-fabricated concrete panels;
• industrial oors subject to vehicular traf c; concrete oors for car-parks, supermarkets, shopping centres and warehouses;
• concrete walls and general internal and external vertical structures where the use of a thixotropic product is required
TECHNICAL CHARACTERISTICS
Mape ex PU40 is a one-component, thixotropic, polyurethane-based sealant with a low modulus of elasticity developed in MAPEI’s own R&D laboratories
Mape ex PU40 hardens following its reaction with the humidity in the surrounding air and, because of its special characteristics, offers a guarantee of a long service life
The product is ready to use and is available in aluminium cartridges and cartridges equipped with a special extrusion gun from Mapei Gun range, which makes the product particularly easy to use
Its consistency allows for rapid application and once set it may be painted over
Before painting over Mape ex PU40 it must be fully polymerised We recommend using elastomeric paint systems
Always carry out preliminary tests to make sure the sealant and paint are compatible
RECOMMENDATIONS
Do not use on dusty or aky surfaces
Do not use on surfaces which are damp
Do not use on surfaces which are dirty with oil, grease or stripping compounds, the bonding could be compromised.
· Do not use on bituminous surfaces where the bleeding of oil may be present
Do not apply Mape ex PU40 if the temperature is lower than +5°C
APPLICATION PROCEDURE
Preparation of the surface to be sealed
All the surfaces to be sealed must be dry, sound and free of dust, crumbling parts, oil, grease, wax and old paint To guarantee that the sealant works correctly, the joint must be free to expand and contract Therefore, it is important that Mape ex PU40 only bonds perfectly to the side walls of the joint, and never to the bottom
The size of the joint must be calculated so that, when in service, it expands less than or equal to 25% of its initial size To regulate the depth of Mape ex PU40 and to avoid it sticking to the bottom of the joint, Mapefoam closed-cell, expanded polyurethane exible cord with a suitable diameter must be inserted beforehand in the joint The depth of the sealant is de ned according to the table below:
WIDTH OF JOINT DEPTH OF SEALANT
Up to 10 mm
From 11 to 20 mm
More than 20 mm
Same as width
10 mm in all cases
Half the width
To avoid the sealant spreading out of the joint, and to leave an attractive nish, we recommend using masking tape around the joints
Mape ex PU40 adheres well to the most commonly used absorbent or compact materials used in the building industry without primer, as long as they are perfectly clean and have no dust or form-release compound on their surface We recommend applying Primer M, suitable for absorbent or metal surfaces, or Primer A, suitable for non-absorbent substrates, if the surfaces are not solid or clean enough, or if the joints are subject to high mechanical stress or frequent, prolonged contact with liquids, or if they are applied on cementitious surfaces which are still wet
If Mape ex PU40 is applied on surfaces which are not absorbent, such as iron, steel, aluminium, copper, ceramic, glass or zinc-plated or painted sheet, Mape ex PU40 adheres well to surfaces after simply degreasing them with a suitable product In any case, the application of Primer M or Primer A will improve adhesion over the years
Application of primer
Using a brush, apply a thin, uniform layer of Primer M or Primer A, one-component polyurethane primers, around the edges of the joint The successive application of sealant must only be carried out once the primer is no longer sticky (20 min for Primer M, 120 min for Primer A at +23°C and 50% H R )
Preparation and application of Mape ex PU40
Extrude the sealant into the joint in a continuous ow without entraining air Immediately after applying the product smooth over the surface with a suitable tool kept constantly wet with soapy water
CONSUMPTION
According to the size of the joint Consult the table below for consumption of the product:
Cleaning
Mape ex PU40 may be removed from surfaces, tools, clothing etc with toluere or alcohol before the hardening reaction takes place After hardening, it may only be removed mechanically
PACKAGING
Boxes of 20 (600 ml soft cartridges)
COLOURS AVAILABLE
Mape ex PU40 is available in white and 111 grey Other colours are available upon request
STORAGE
TECHNICAL DATA (typical values)
PRODUCT IDENTITY
Classi cation according to EN 15651-1: F-EXT-INT-CC, class 25 LM
Classi cation according to EN 15651-4: PW-EXT-INT-CC, class 25 LM
Appearance: thixotropic paste
Colour: white, 111 grey
Density (g/cm³): approximately 1 40
Dry solids content (%): 100
Brook eld viscosity at +23°C (mPa s): 1,000,000 ± 200,000 (rotor F - 5 revs)
APPLICATION DATA (at +23°C and 50% R H )
Recommended application temperature range: from +5°C to +35°C
Dust dry: 60 min
Final setting after: 3 mm/24 h - 4 mm/48 h
Set to light foot traf c: according to the depth of the joint
FINAL PERFORMANCE
Shore A hardness (DIN 53505): 30
Tensile strength (DIN 53504S3a) (N/mm²): – after 28 days at 23°C and 50% R.H.: 3
Elongation at breakage (DIN 53504S3a) (%) – after 28 days at 23°C and 50% R H : 1,000
In service temperature: from -40°C to +70°C
Resistance to UV rays: excellent
Elongation in service (continuous use) (%): 25
Classi cation according to ISO 11600: class E - 25 LM
Modulus of elasticity at +23°C (ISO 8339) (N/mm²): 0.24
Modulus of elasticity at -30°C (ISO 8339) (N/mm²): 0.31
Springback (%): 85
SAFETY INSTRUCTIONS FOR PREPARATION AND APPLICATION
For further and complete information about the safe use of our product please refer to the latest version of our Safety Data Sheet available for download from our website at www.mapei.com.au.
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 con rmation 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 au
LEGAL NOTICE
The contents of this Technical Data Sheet (“TDS”) may be copied into another project-related document, but the resulting document shall not supplement or replace requirements per the TDS in force at the time of the MAPEI product installation
The most up-to-date TDS can be downloaded from our website www. mapei.com.au.
ANY ALTERATION TO THE WORDING OR REQUIREMENTS CONTAINED OR DERIVED FROM THIS TDS EXCLUDES THE RESPONSIBILITY OF MAPEI