ELASTOSIL® N 291

Moisture Curing Silicone Rubber (RTV-1)
ELASTOSIL® N291 is a free-flowing, ready-to-use silicone rubber with long open time dedicated to screen printing.
It vulcanizes either at room temperature or at high temperatures under the influence of atmospheric moisture.

Properties
• low viscosity
• low structure viscosity & thixotropy
• long open time, suitable for screen printing
• can be colored with 3 – 5 % Pigment Paste FL

Specific features
• Coolant resistant
• Heat resistant
• Oil resistant

Technical data

Application details

ELASTOSIL® N291 can be used for screen printing on diverse substrates. It works both on sulphur containing or sulphur
free fibre gaskets.

Some filler may settle during transport and storage. To ensure a uniform mix, the components should be thoroughly stirred
prior to use. ELASTOSIL® N291 is a moisture curing silicone sealant. For this reason the curing rate strongly depends on
both temperature and atmospheric humidity in the surrounding. ELASTOSIL® N291 can be applied with standard silk
screen printing equipment.

Processing

Some filler may settle during transport and storage. To ensure a uniform mix, the components should be thoroughly stirred
prior to use.

ELASTOSIL® N291 is a moisture curing silicone sealant. For this reason the curing rate strongly depends on both
temperature and atmospheric humidity in the surrounding. ELASTOSIL® N291 can be applied with standard silk-screen
printing equipment.

It cures under the influence of moisture from the air. Colors may be obtained by addition of 3 – 5 % Pigment Paste FL if
desired. After addition the material has to be mixed carefully.

Detailed processing instructions are 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

ELASTOSIL® N291 releases during cure a total of 4 % butanone oxime. These vapours should not be inhaled for long
periods or in high concentration. Work areas should therefore be well ventilated.
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.