WACKER® GP-N - GENERAL PURPOSE NEUTRAL COLOURED is a one-part, neutral silicone sealant with outstanding adhesion to most building substrates. It further exhibits good weather resistance and workability for glazing.

WACKER® GP-N - GENERAL PURPOSE NEUTRAL COLOURED cures at room temperature in the presence of atmospheric moisture to give a permanent flexible silicone rubber.


Special features

  • long shelf life
  • non-sag
  • readily gunnable both at low (+5 °C) and high (+40 °C) temperatures
  • good tooling properties
  • excellent weatherability
  • excellent adhesion
  • excellent durability
  • non-corrosive to metals
  • suitable for alkaline substrates such as concrete, mortar, fibrous cement

Data sheets



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 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.
Restrictions on use
WACKER® GP-N - GENERAL PURPOSE NEUTRAL COLOURED 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® GP-N - GENERAL PURPOSE NEUTRAL COLOURED 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® GP-N - GENERAL PURPOSE NEUTRAL COLOURED is not suitable for the following plastic substrates such as Polyethylene, Polypropylene, ABS, Acrylic, Polycarbonate (PC).
It is the responsibility of the user to test the compatibility of the sealant with the adjoining materials. Incompatible substances like coatings or organic plasticizers can lead to discoloration of the sealant. Cleaning agents and gaseous emissions can damage the sealant in its function or change its appearance. WACKER cannot make a general statement to the compatibility of all these varying materials with the sealant. In case of doubt the user shall conduct appropriate preliminary tests.


- Sealant for internal connection and expansion joints
- Suitable for fenestration and glazing
Adhesion WACKER® GP-N - GENERAL PURPOSE NEUTRAL COLOURED exhibits excellent primerless adhesion to most non-porous siliceous materials (e.g. glass, tiles, ceramics, enamel, glazed tiles); metals (e.g. aluminum, steel, zinc or copper); impregnated, varnished or painted wood; and some plastics.
Users must carry out own tests due to the great variety of substrates.
The adhesion can be improved in many cases by pretreatment of the substrate with a primer.


WACKER® GP-N - GENERAL PURPOSE NEUTRAL COLOURED 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.

Sales and support

Wacker Chemical Corporation
3301 Sutton Road
Adrian, MI 49221-9397
United States
+1  888  922-5374 (Phone)

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