ELASTOSIL® SP 6140 Liquid Silicone Rubber 

Characteristics
ELASTOSIL® SP 6140 is a free-flowing, addition curing silicone rubber, which is mixed with crosslinker to form a ready-to-use product with long pot life which cures rapidly at high temperatures.

Special characteristics
• Solvent-free & strong adhesion to fabrics
• Processing viscosity suitable for silk-screen printing
• Long term flexibility over a temperature range from -50 °C to +200 °C
• Good resistance to chemicals
• Long pot life of ready-to-use mixture

Application
ELASTOSIL® SP 6140 may be used for applicationswhich require high or low temperature resistant flexible coating.
A typical application in the automotive industry is silk-screen printing on selected areas of cylinder head gaskets.

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

To prepare mixtures for processing the crosslinker is added and stirred well.
Small amounts can be mixed by hand or mechanically (e. g. power tool fitted with mixing blade) for at least 30 seconds.

Note:
Certain substances can inhibit the curing process to a greater or lesser extent. The most notable include:

• Sulphur and sulphur-containing materials (e. g., vulcanizing agents in natural and synthetic rubbers)
• Amines, urethanes and amine-containing materials (e. g. amine-cured epoxy resins)
• Unsaturated hydrocarbons (e. g. certain plasticizers)
• Organo-metallic compounds, particularly organo-tin compounds and materials containing such sub stances (e. g., curing agents and condensation cured RTV-2 silicone rubbers).

If in doubt, carry out preliminary tests to ascertain the compatibility of all materials in contact with the cata lysed mix. Liquid product or sticky surfaces indicate cure inhibition. Our technical service will be glad to give you information on how to prevent such problems.

Adhesion of ELASTOSIL® SP 6140 depends on the amount of crosslinker and on curing conditions.
Therefore, preliminary tests should be carried out to determine optimum formulation and cure conditions.

Storage

ELASTOSIL® SP 6140 has a shelf life of at least 6months when stored between 5 °C and 30 °C in the originally sealed container. The ‘Best use before end’ date of each batch appears 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 information

According to the latest findings, the addition-curing silicone rubber ELASTOSIL® SP 6140 contains neither toxic or corrosive substances which would require special handling precautions. General hygiene regulations should be observed.

Comprehensive instructions are given in the corresponding Material Safety Data Sheets. They are avail-able on request from Wacker subsidiaries.