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CREATING TOMORROW'S SOLUTIONS
ELASTOSIL® E41
TRANSPARENT
Moisture Curing Silicone Rubber (RTV-1)
ELASTOSIL® E41 TRANSPARENT is a flowable, one-component silicone rubber with excellent mechanical properties,
which cures at room temperature under the influence of atmospheric moisture.
It shows excellent mechanical properties, has good adhesion properties to many substrates, in particular on cured silicone
rubber
Properties
• self-levelling
• solvent containing
• excellent adhesion on cured silicone rubber
• high-tear grade
• Recommended service temperature from -45 °C to 180 °C
• max. recommended short term peak temperature exposure 200°C
Specific features
• Adhesion: Good adhesion to metals, glass and ceramics
• Crosslinking Property: Acetoxy-cure
• Crosslinking Property: One-component
• Product Rheology: Self-levelling
• Specific Features: Excellent mechanical properties
• Specific Features: High tear-resistant
• Specific Features: One-component
• Vulcanizate: Excellent mechanical properties
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Technical data
Properties Uncured
Property Condition Value Method
Color - transparent -
Density 23 °C 1.08 g/cm³ DIN EN ISO 2811-1
Viscosity, dynamic D = 1 1/s 25 °C 100000 mPa·s DIN EN ISO 3219
Viscosity, dynamic D = 25
1/s
25 °C 80000 mPa·s DIN EN ISO 3219
Skin formation time - 10 - 20 min internal method
Curing speed 23 °C | 50 % r.h 12 h/mm -
These figures are only intended as a guide and should not be used in preparing specifications.
Properties Cured
Curing conditions: 2mm, 14 days storage at 23 °C and 50 % RH.
Property Condition Value Method
Color - transparent -
Density in water 23 °C 1.12 g/cm³ DIN EN ISO 1183-1 A
Hardness Shore A - 40 DIN ISO 48-4
Tensile strength⁽¹⁾ - 6.0 N/mm² ISO 37 type 1
Elongation at break⁽²⁾ - 350 % ISO 37 type 1
1
Type 3 / 23°C / 2mm
2
Type 3 / 23°C / 2mm
These figures are only intended as a guide and should not be used in preparing specifications.
All the information provided is in accordance with the present state of our knowledge. Nonetheless, we disclaim any warranty or liability whatsoever and reserve the right, at any
time, to effect technical alterations. The information provided, as well as the product's fitness for an intended application, should be checked by the buyer in preliminary trials.
Contractual terms and conditions always take precedence. This disclaimer of warranty and liability also applies particularly in foreign countries with respect to third parties' rights.
Applications
• Luminaires
Application details
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Multipurpose sealant and adhesive for general industry and electronics for FIPG applications. Particularly suitable as
adhesive on cured rubber or silicone coated textiles like seam sealing.
Processing
ELASTOSIL® E41 TRANSPARENT is a ready-to-use, one-part silicone rubber which starts curing when exposed to air
moisture. Typical curing characteristics are given in the table "Properties Uncured". As RTV-1 silicones require humidity for
curing, free access of air moisture to the silicone rubber is essential.
Additionally, the vulcanization time can be greatly reduced by increasing the level of air's relative humidity. Please note that,
unlike the initial skin formation, the total curing rate of RTV-1 silicones is limited by moisture's diffusion speed in silicone
rubber. As increasing the curing temperature has just a minor effect both on the skin forming time and the curing speed,
ELASTOSIL® E41 TRANSPARENT typically is vulcanized at room temperature. Heat curing is recommended only for
applications where the silicone rubber is applied as a thin film (thickness less than 0.5 mm) in combination to temperatures
not exceeding 80°C as otherwise blistering is likely to occur due to the quick release of acetic acid and solvent.
After completion of the vulcanization the silicone elastomer may continuously be exposed to constantly changing climatic
conditions, UV radiation and high temperature without damage. Cured ELASTOSIL® E1 TRANSPARTENT usually shows
good primerless adhesion to many substrates, e.g. glass, ceramics, metals, plastics and powder coatings and in particular
to cured silicone rubber.
Detailed information about the processing of RTV-1 silicones is given in our brochure “ROOM TEMPERATURE
VULCANIZING (RTV) SILICONES - MATERIAL AND PROCESSING GUIDELINES”.
We recommend running preliminary tests to optimize conditions for the particular application.
Removal: If removal of the silicone from machines or dispensing equipment is necessary, white spirit or similar nonpolar
solvents are recommended. However, cleaning ideally should take place before the silicone rubber is fully vulcanized. Cured
silicone needs to be rubbed off or removed mechanically, if necessary in combination with a swelling agent (solvent) or a
chemical silicone removerELASTOSIL E41 TRANSPARENT shows good primerless adhesion to many substrates. We
recommend running preliminary test to optimize conditions for the particular application
Packaging and storage
Storage
The 'Best use before end' date of each batch is shown on the product label.
Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case
however, the properties required for the intended use must be checked for quality assurance reasons.
Safety notes
Comprehensive instructions are given in the corresponding Material Safety Data Sheets.
They are available on request from WACKER subsidiaries or may be printed via WACKER web site http://www.wacker.
com.
QR Code ELASTOSIL® E41 TRANSPARENT
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For technical, quality or product safety questions, please contact:
Wacker Chemie AG, Hanns-Seidel-Platz 4, 81737 Munich, Germany
info@wacker.com, www.wacker.com
The data presented in this medium are in accordance with the present state of our knowledge but do not absolve the user from carefully checking all supplies immediately on
receipt. We reserve the right to alter product constants within the scope of technical progress or new developments. The recommendations made in this medium should be
checked by preliminary trials because of conditions during processing over which we have no control, especially where other companies’ raw materials are also being used. The
information provided by us does not absolve the user from the obligation of investigating the possibility of infringement of third parties’ rights and, if necessary, clarifying the
position. Recommendations for use do not constitute a warranty, either express or implied, of the fitness or suitability of the product for a particular purpose.
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