ARDEX ST - Silicone for natural stone sealing

Silicone for sealing natural stone. Interior and exterior in various colours.

Packaging format
Pack format
Color DE
  • Steingrau
  • Silbergrau
  • Weiss
  • Sandbeige
  • Anthrazit
  • Jurabeige
Tax excluded


Silicone for sealing natural stone. Interior and exterior. Colours: Silver Grey, Stone Grey, Anthracite, Jurabeige, White.

  • Special silicone for natural stone sealing.
  • Neutral silicone sealant with fungicide finish.
  • Elastic sealing of expansion joints, corner joints and joint joints, indoors and outdoors.
  • Sealing of natural stone joints in marble, granite, quartzite, gneiss, Solnhofener, etc.
  • Easy to inject and smooth.
  • Strong adhesion.
  • Resistant to weathering, UV rays as well as commercial cleaning and disinfection agents.
  • Available in: white, silver grey, dark grey, beige and anthracite.

Field of application:

Indoors and outdoors. Walls and floors.

Elastic sealing of expansion joints, corner joints and joint seals:

- in bathrooms, showers and toilets

- in the home with natural stone cladding

- on doors, windows and mounting elements

- on balconies, terraces and facades

Product properties:

ARDEX ST is a one-component silicone sealant that can be easily injected and smoothed. In combination with Primer SP 1, ARDEX ST is suitable for sealing joints in natural stone such as marble, granite, quartzite, gneiss, Solnhofener stone, etc. without discolouration. Due to its high elasticity, expansion and contraction movements are compensated by up to 25% of the joint width. After polymerisation, ARDEX ST is resistant to weathering, UV rays and commercially available cleaning and disinfecting agents. The joint can be cleaned without any problems.

It contains fungicides that prevent the formation of fungus and mould. The colour shades are matched to the ARDEX MG grout, especially for marble.


Silicone, alcohol hardener.


Single component.



Density DIN 52451:  

Approx. 1.0 gr./cm3.

Joint width: 

Up to 30 mm

Application temperature:  

+ 5°C to + 40°C (substrate temperature).

Film formation time*: 

Approx. 15 minutes, after a few hours, the skin is severely vulnerable.

Speed of complete drying:  

Approx. 1 mm / day approx. 6 mm / week.

Temperature resistance: 

- 40°C up to + 120°C.

Practical expansion capacity: 

Approx. 25% of joint width.

Modulus E 100%: 

Approx. 0.40 N/mm2 (DIN EN 28339 procedure A).

Shore A hardness: 

Approx. 20.


10 mm x 10 mm approx. 3.0 ml/cartridge.

Triangular seal: 

6.0 ml/cartridge

5 mm x 5 mm approx. 12 ml/cartridge


Cartridges with 310ml net, in packs of 12 pieces.


Approx. 12 months in dry places and in original sealed packaging.


Product Details

Silicones and Adhesives
Indoor and outdoor
Single component
Floor and wall
Normative UNE
UNE-EN 15651
Drying time


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