WACKER® 440 - GLAZING AND PERIMETER is a one-component, neutral-curing, fire retardant, low modulus silicone sealant with outstanding adhesion, long shelf life and excellent tooling characteristics for construction, glass and window building, as well as industrial applications.

WACKER® 440 - GLAZING AND PERIMETER cures at room temperature in the presence of atmospheric moisture to give a permanently flexible silicone rubber.


  •  excellent weatherability
  •  excellent processing characteristics for professional use
  •  primerless adhesion to most materials
  •  non-corrosive to metals
  •  suitable for alkaline substrates such as concrete, mortar, fibrous cement
  • compatible with water-based and solvent-based coatings: no plasticizer migration
  •  ready gunnability at low (+5 °C) and high (+40 °C) temperatures
  •  rapid crosslinking: quickly becomes tack-free
  •  flexible at low (-40 °C) and high temperatures (+150 °C)
  •  almost odorless
  •  long shelf life
  •  non-sag


Application fields

  •  sealing of connecting and expansion joints in the building industry
  •  suitable for fenestration applications
  •  especially suitable for perimeter sealing
  •  sealing of joints between glazing and supporting structure (frames, transoms, mullions)



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.

For application from cartridges cut thread open, fix nozzle on top and cut to required bead size. The sealant can be applied in beads or layers. It requires moisture in order to cure. The curing time can take longer at lower temperatures, lower humidity or by low volume of air exchange.

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.



WACKER® 440 - GLAZING AND PERIMETER is certified and classified according to

  • ISO 11600 F/G, class 25 LM
  • EN 15651-1, class 25LM F-EXT-INT-CC
  • EN 15651-2, class 25LM G-CC
  • DIN 18545-2, class E
  • SNJF F/V, class 25E



WACKER® 440 - GLAZING AND PERIMETER exhibits excellent primerless adhesion to many non-porous siliceous materials, e.g. glass, tiles, ceramics, enamel, glazed tiles and clinker, concrete and cement, metals e.g. aluminum, zinc, steel, copper, varnished or painted wood as well as many plastics.

Users must carry out their own tests due to the great variety of substrates. 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.


Restrictions on use

WACKER® 440 - GLAZING AND PERIMETER must not be used as a secondary sealant in insulating glass units.

WACKER® 440 - GLAZING AND PERIMETER must not be used for structural glazing bonding.

 WACKER® 440 - GLAZING AND PERIMETER is not suitable for use on natural stones, such as marble, granite, quartzite, as it can cause staining. In this case use an alternative grade such as WACKER® 460 – NATURAL STONE. 

WACKER® 440 - GLAZING AND PERIMETER is not recommended for sealing of aquarium or for long term use under water. WACKER® 121 - AQUARIUM has been specifically developed for aquarium applications.

WACKER® 440 - GLAZING AND PERIMETER is not suitable for use as a mirror adhesive. For this application please use WACKER® HS - HYBRID SEALANT.

WACKER® 440 - GLAZING AND PERIMETER is not suitable for food grade applications where the joints are likely to come in contact with food. For this application please use WACKER® 120 – FOOD CONTACT.


WACKER® 440 - GLAZING AND PERIMETER is usually supplied in standard size cartridges that fit all standard caulking guns.


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.


Wacker Chemicals (China) Co.,Ltd.
Caohejing Hi-Tech Park
200233 Shanghai
+86  21  6130-2000 (电话)
+86 21 6130-2500  (传真)
Contact Sales


  • 您在选择产品方面需要帮助或者需要技术咨询? 请联系我们的专家
Ask a question