WACKER® 128
Characteristics
WACKER®128 is a one-part, acid-curing, high-modulus silicone sealant for glazing and industrial applications.
WACKER® 128 cures at room temperature under the action of atmospheric moisture to give a permanently flexible silicone rubber.
Properties
Properties
• Non-sag
• Ready gunnability at low (+5°C) and high (+40°C) temperatures
• Flexible at low (-40°C) and high temperatures (+150°C)
• Rapid crosslinking: quickly becomes tack-free
• Long shelf life
• Solvent free
• High modulus
• Excellent tooling properties
• Adheres excellently to glass, vitrified surfaces, ceramic tiles, many plastics and most paints
Data sheets
Application
• Sealing of joints between glazing and supporting structure (frame, tansoms, mullions)
• Glass and windows construction
Restrictions on use
WACKER® 128 should not be used on substrates such as marble, concrete, fibrous cement and mortar, as the product releases acetic acid during vulcanization.
These figures are intended as a guide and should not be used in preparing specifications.
WACKER® 128 should not be used in contact with metals such as lead, copper, brass or zinc due to corrosion.
WACKER® 128 may be discolored in contact with some organic elastomers, e.g. EPDM, APTK and neoprene.
WACKER® 128 is not recommended for sealing of aquaria.
WACKER® 128 is not recommended for use on natural stone, such as marble, granite, quartzite, as it can cause staining.
WACKER® 128 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
WACKER® 128 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
Storage
WACKER® 128 has a shelf life of at least 18 months when stored in a cool (below 25°C), dry place in moisture-tight original container. The best before date of each batch is shown on product label.
If the material is kept beyond the recommended shelf life, it is not necessarily unusable, but a quality control should be performed on the properties relevant to the application.
Sales and support
Bracknell RG12 1WA
United Kingdom
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