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ELASTOSIL® 8510 is a one-part, neutral-curing, low modulus silicone sealant with outstanding adhesion properties long shelf live and very good working properties for construction, especially for sealing natural substrates as granit or marble and other indoor also in sanitary applications.
ELASTOSIL® 8510 cures at room temperature in the presence of atmospheric moisture to give a permanently flexible silicone rubber.


  • suitable for areas with high humidity e.g. sanitary areas
  • espacially suitable for sealing natural stones such as marble, granite, sandstone, quarzite; no staining of joint edges
  • non-sag
  • ready gunnability at low (+5 °C) and high (+40 °C) temperatures
  • non-staining and non-bleeding: no contamination of joint edges through plasticizers
  • can be used with aqueous or solvent-based coating compounds: no plasticizer migration
  • rapid crosslinking: quickly becomes tack-free
  • primerless adhesion to most materials
  • non-corrosive to metals
  • suitable for alkaline substrates such as concrete, mortar, fibrous concrete
  • high abrasion resistance
  • almost odorless
  • long shelf-life
  • excellent weatherability


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.

Application fields
ELASTOSIL® 8510 has been specially developed for natural substrates such as marble, granite, sandstone and quartzite. In contrast to ordinary silicone sealants, contact with these construction materials causes no staining of joint edges. Moreover, ELASTOSIL® 8510 is flexible and adheres to most materials without primers.
ELASTOSIL® 8510 is ideal for sealing joints in interior and exterior facades e.g. for sanitary applications or cladding of natural stone or other materials.
For made preservation of facades made of sensitive natural substrates, we recommend imparting water repellency with masonry water repellent such as Wacker® BS 29.



The substrate areas that will be in contact with the sealant must be clean, dry and free of all loose material such as dust, dirt, rust, oil and other contaminants. Non-porous substrates should be cleaned with a solvent and a clean, lint-free, cotton cloth. Remove residual solvent before it evaporates with a fresh clean, dry cloth.



ELASTOSIL® 8510 is certified and classified according to

  • ISO 16938-1
  • EN 15651-1, Class 25LM F-EXT-INT-CC
  • EN 15651-2, Class 25LM G-CC
  • EN 15651-3, Class XS1



ELASTOSIL® 8510 exhibits excellent primerless adhesion to most materials used for sanitary application, e.g. glass, tiles, ceramics, enamel, glazed tiles and clinker; metals, e.g. aluminium, steel, zinc or copper; impregnated, varnished or painted wood; and many plastics.
Users must carry out their own tests due to the great variety of substances. For critical applications in facades made of natural substrate, we recommend using Wacker® Primer G 783. If adhesion difficulties arise please contact our technical service.


Restrictions on use

It is the responsibility of the user to test the compatibility of the sealant with the adjoining materials. Incompatible substances like coating materials (paints, varnishes and glazes) or organic plasticizer containing rubbers (EPDM, butyl and neoprene) can lead to discoloration or other impairments like loss of adhesion of the sealant. Materials in direct contact with the applied sealant like cleaning agents and materials in indirect contact like gaseous emissions can damage the sealant in its function or change its appearance. Because of the multitude of these materials, Wacker cannot make a general statement to the compatibility of materials with the sealant. In case of doubt the user shall conduct appropriate preliminary tests.

ELASTOSIL® 8510 must not be used for sealing of aquaria.

ELASTOSIL® 8510 is not suitable for insulating applications. The curing time can be extended at lower temperature, lower humidity or by low volume of air exchange.

The time until complete curing may be extended at lower temperature, lower humidity, increasing film thickness or by low volume of air exchange.

The use of tooling agents should be avoided if possible. Otherwise, water or a diluted solution of a little neutral soap or alcohol in water should be sparingly applied.


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

Wacker Chemical Corporation
3301 Sutton Road
Adrian 49221-9397
United States
+1  888  922-5374 (Phone)
+1 517 264-8246  (Fax)
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