Wacker 121 Aquarium Silicone Sealant – Clear (Professional Grade)

Professional-Grade Clear Silicone for Aquarium Construction

Wacker 121 - Aquarium 8 is a premium, one-part, acetoxy-curing silicone sealant developed specifically for building and sealing aquariums. Trusted by leading aquarium manufacturers worldwide, it delivers exceptional strength, flexibility, and transparency.

Key Features & Benefits

• Cures into permanent, flexible silicone rubber

• Crystal clear finish for seamless, invisible joints

• Non-sag formula with excellent tooling characteristics

• Long shelf life and easy application at low (+5 °C) and high (+40 °C) temps

• Rapid crosslinking – becomes tack-free quickly and resists cracking

• High mechanical strength with low shrinkage after curing

• Maintains flexibility in extreme temperatures from -40 °C to +150 °C

Ideal For

• Construction of glass aquariums (DIN 32 622 compliant)

• Joints exposed to high mechanical loads

• Applications needing quick build-up of strength

• General glazing and industrial sealing applications

Cartridge Details

• Standard 310ml size

• Fits all standard caulking guns

• Colour: Clear

Substrate Compatibility

Bonds well to:

• Glass, ceramics, enamel, and glazed tiles

• Metals such as aluminium and steel

• Painted or varnished wood

• Select plastics

Not recommended for:

• Marble, granite, quartzite, concrete, mortar

• Copper, brass, zinc, lead

• EPDM, neoprene, fibrous cement

• Polyacrylate under stress

• Insulating glass applications

Always test compatibility prior to full application. Primer may be required for some surfaces.

Application Instructions

• Ensure surfaces are clean, dry, and free from dust, oil, and contaminants

• Clean non-porous surfaces with solvent and lint-free cloth

• Apply in beads or layers after cutting nozzle to desired size

• Sealant cures with atmospheric moisture – allow sufficient airflow

• Lower temperatures or humidity will extend curing time

Safety & Storage

• During curing, acetic acid vapours are released – ventilate work area

• Avoid prolonged contact with uncured sealant

• Keep out of reach of children

• Store as indicated on packaging; expired product may still be usable after testing