WACKER® 121 - AQUARIUM is a one-part, acid-curing, silicone sealant with excellent mechanical properties and high curing rate for construction of aquariums and industrial applications. WACKER® 121 - AQUARIUM cures at room temperature under the action of atmospheric moisture to give a permanently flexible silicone rubber.
Properties
-long shelf life
-non-sag
-excellent tooling characteristics for professional use
-readily gunnable both at low (+5 °C) and high (+40 °C) temperatures
-rapid crosslinking: quickly becomes tack-free and crack resistant
-flexible at low (-40 °C) and high temperatures (+150 °C) following cure
-low shrinkage on curing
-special high-viscosity paste
-excellent mechanical properties
Application details
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® 121 - AQUARIUM should not be used on substrates such as marble, concrete, fibrous cement and mortar, as the product releases acetic acid during curing.
WACKER® 121 - AQUARIUM should not be used in contact with metals such as lead, copper, brass or zinc due to corrosion.
WACKER® 121 - AQUARIUM may be discolored in contact with some organic elastomers, e.g. EPDM and neoprene.
WACKER® 121 - AQUARIUM is not suitable for applications involving contact with natural stone, such as marble, granite, quartzite, as it can cause staining.
WACKER® 121 - AQUARIUM is not suitable for insulating glass applications.
WACKER® 121 - AQUARIUM should not be used on pre-stressed polyacrylate elements as it may cause environmental stress cracking.
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.
- sealing of joints exposed to high mechanical loads
- sealing of joints which need to quickly build up mechanical strength
- suitable for the construction of aquariums which meet the requirements of DIN 32 622. The bond thickness must be at least 1 mm. During curing the temperature should be between +15 °C and +40 °C
- suitable for use in glazing and industrial applications and for the construction of silos and containers
Restrictions on use WACKER® 121 - AQUARIUM should not be used on substrates such as marble, concrete, fibrous cement and mortar, as the product releases acetic acid during curing. WACKER® 121 - AQUARIUM should not be used in contact with metals such as lead, cooper, brass or zinc as corrosion will result. WACKER® 121 - AQUARIUM may be discolored in contact with some organic elastomers, e.g. EPDM, APTK and neoprene. WACKER® 121 - AQUARIUM is not recommended for use on natural stone, such as marble, granite, quartzite, as it can cause staining. WACKER® 121 - AQUARIUM is not recommended for structural glazing bonding.
Adhesion
WACKER® 121 - AQUARIUM exhibits excellent primerless adhesion to most non-porous siliceous material, e.g. glass, tiles, ceramics, enamel, glazed tiles and clinker 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.
Technical Data
| Density | 1.03 g/cm³ |
| Skin forming time | 15 min |
| Consistency | non-sag |
| Extrusion rate - mass flow | 250 g/min |
| Movement capability | 25.0 % |
| Modulus at 100 % elongation (S2-dumbbell) | 0.40 N/mm² |
| Modulus at 100 % elongation (joint) | 0.50 N/mm² |
| Curing time | 3.0 mm/d |
| Hardness Shore A | 22 |
Packaging
WACKER® 121 - AQUARIUM is usually supplied in standard size cartridges that fit all standard caulking guns.
Storage
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.
