Datasheet ELASTOSIL E43 Specification

CREATING TOMORROW'S SOLUTIONS

ELASTOSIL® E43
TRANSPARENT

Moisture Curing Silicone Rubber (RTV-1)

ELASTOSIL® E43 TRANSPARENT is a self levelling, one-component acetoxy-cure silicone rubber 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 used as adhesive
on cured silicone rubber

Properties

• moderately self-levelling

• 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

• Excellent mechanical properties

• Solvent-free

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Technical data

Properties Uncured

Property Condition Value Method

Color - transparent -

Density 20 °C 1.09 g/cm³ DIN EN ISO 2811-1

Viscosity, dynamic D = 0.5
1/s

Viscosity, dynamic D = 25
1/s

25 °C 250000 mPa·s DIN EN ISO 3219

25 °C 175000 mPa·s DIN EN ISO 3219

Skin formation time⁽¹⁾ - 10 min -

Curing time 23 °C | 50 % r.h 12 h/mm -

1

at 23 °C / 50 % r.h.

These figures are only intended as a guide and should not be used in preparing specifications.

Properties Cured

Curing Conditions: 14 days at 23 °C and 50 % rel. humidity, 2 mm sheet, no post-curing

Property Condition Value Method

Color - transparent -

Density in water 23 °C 1.10 g/cm³ DIN EN ISO 1183-1 A

Hardness Shore A - 30 DIN ISO 48-4

Tensile strength⁽¹⁾ - 6.50 N/mm² ISO 37 type 1

Elongation at break⁽²⁾ - 500 % 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

• Appliances Industry

• Automotive, Aerospace & Railway

• Bonding & Sealing

• Formed-In-Place-Gaskets (Wet Type)

• Industrial Assembly

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• Ready-to-Use Silicone Sealants - General Applications

• Small Appliances

Application details

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® E43 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 of ELASTOSIL® E43 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® E43 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), because otherwise blistering is likely to occur due to
the quick release of acetic acid.
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® E43 usually shows good primerless
adhesion to many substrates, e.g. glass, ceramics, metals, plastics and powder coatings.
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 remover ELASTOSIL E43 shows good primerless adhesion to many substrates. We recommend running
preliminary tests to optimize conditions for the particular application.

Detailed information about the processing of RTV-1 silicones is given in our brochure “ROOM TEMPERATURE
VULCANIZING (RTV) SILICONES - MATERIAL AND PROCESSING GUIDELINES”.

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

During vulcanization of ELASTOSIL® E43 TRANSPARENT, a total of 4% by weight of acetic acid is split off. These vapours
should not be inhaled for long periods or in high concentration. Work areas should therefore be well ventilated. Contact of
unvulcanized silicone rubber with eyes and mucous membranes must be avoided as this would cause irritation. However if
it does happen, rinse the affected area thoroughly with water.

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.

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QR Code ELASTOSIL® E43 TRANSPARENT

For technical, quality or product safety questions, please contact:

Wacker Chemie AG, Hanns-Seidel-Platz 4, 81737 Munich, Germany

[e-mail], 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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