ELASTOSIL® 4851
Elastosil® 4851 is a one-part, acid-curing, high-modulus silicone sealant for glazing and industrial applications.
Elastosil® 4851 cures at room temperature under the action of atmospheric moisture to give a permanently flexible silicone rubber.
Properties
• Excellent anti-fungi performance
• Non-sag
• Ready gunnability at low (+5 ℃) and high (+40 ℃) temperatures
• Low shrinkage during vulcanization
• Flexible at low (-40 ℃) and high temperatures (+180 ℃)
• Rapid crosslinking: quickly becomes tack-free
• Long shelf life
• Slovent-free
• High modulus
• Excellent tooling characteristics for professional use
• Excellent adhesion with glass，vitrified surfaces，ceramic tiles，many plastics and most paints.
Data sheets
Application
• Glass and windows construction
• Sealing of joints between glazing and supporting structure (frame, transoms, mullions)
Restrictions on use
These figures are intended as a guide and should not be used in preparing specifications.
Elastosil® 4851 should not be used on substrates such as marble, concrete, fibrous cement and mortar, as the product releases acetic acid during vulcanization.
Elastosil® 4851 should not be used in contact with metals such as lead, copper, brass, or zinc due to corrosion.
Elastosil® 4851 may be discolored in contact with some organic elastomers, e.g. EPDM, APTK and neoprene.
Elastosil® 4851 is not recommended for sealing of aquaria, please use our ELASTOSIL® 121.
Elastosil® 4851 is not recommended for use on natural stone, such as marble, granite, quartzite, as it can cause staining.
Elastosil® 4851 is not recommended for structural glazing bonding.
Preparation
The substrate areas that will be in contact with the sealant must be clean, dry and free of all loose material, dust, dirt, rust, oil and other contaminants. Non-porous substrates should be cleaned with a solvent and a clean, lint-free, cotton cloth. Wipe dry immediately with another such cloth before the solvent evaporates from the surface.
Adhesion
Elastosil® 4851 exhibits excellent primerless adhesion to most non-porous siliceous material, e.g. glass, tiles, ceramics, enamel, glazed tiles and clinker; impregnated, varnished or painted wood; and some plastics.
Users must carry out their own tests due to the great variety of substances.
The adhesion can be improved in many cases by pretreatment of the substrates with a primer.
If adhesion difficulties arise, please contact our technical service.
Storage
Elastosil® 4851 has a shelf life of at least 12 months when stored at a cool dry place (below 25 ℃). 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.
Sales and support
Bracknell RG12 1WA
United Kingdom
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