Packaging Size: 300 ml cartridge
Packaging Type: Tube
Colours Available: Clear
Brand: Wacker
Cure Type: Acetoxy (Acid Cure)
Compatible Materials: Glass
Country of Origin: Made in India
Availability: In Stock
When it comes to glass-to-glass bonding, especially in structures that must hold hundreds of liters of water, there is no room for compromise. Wacker 121 Aquarium Silicone Sealant is globally recognized as the gold standard for aquarium manufacturers and professional glass fabricators.
As a premium, high-performance acetoxy-curing silicone, Wacker 121 is engineered specifically for the most demanding glass applications. At Poly Prime Industry, we provide this specialized German-technology solution to contractors and businesses across Delhi, ensuring that every aquarium built is a masterpiece of safety, clarity, and durability.
Wacker 121 Aquarium Silicone Sealant is a one-component, acid-curing (acetoxy) silicone sealant. Unlike multipurpose sealants, its chemical profile is stripped of harmful fungicides and oils that could leach into water or weaken the structural integrity of a glass tank.
The magic of Wacker 121 Aquarium Silicone Sealant lies in its curing process. Upon application, the sealant reacts with the moisture present in the air. This chemical reaction transforms the paste into a permanently flexible, high-modulus silicone rubber. This transition ensures that the bond isn’t just a surface stick, but a deep, molecular-level fusion with the glass surface.
Aquariums face constant hydrostatic pressure. Wacker 121 Aquarium Silicone Sealant is formulated with a high-strength molecular chain that resists the outward force of water. This prevents “joint creep” or seal failure over time, even in tall or rimless tanks where the stress on the silicone is highest.
For high-end glass projects, appearance is everything. Wacker 121 Aquarium Silicone Sealant comes in a “Water-Clear” finish. It does not yellow over time when exposed to UV light or tank lighting. The result is a seamless, nearly invisible joint that highlights the beauty of the glass rather than the sealant.
Most construction sealants contain anti-mold chemicals (fungicides) which are lethal to fish and coral. Wacker 121 is 100% pure silicone, making it completely safe for delicate aquatic ecosystems once fully cured.
Whether you are sealing a vertical corner joint or a horizontal base, Wacker 121 Aquarium Silicone Sealant stays exactly where you put it. Its “thixotropic” nature means it flows easily through a nozzle but won’t slump or run down the glass, allowing for the clean, sharp lines that professional fabricators demand.
While its name highlights aquariums, the versatility of Wacker 121 Aquarium Silicone Sealant makes it a favorite for several specialty glass works:
Custom Aquarium Fabrication: From small home tanks to large-scale commercial displays and public aquarium exhibits.
Rimless Glass Tanks: Ideal for “minimalist” tanks where the silicone must provide the primary structural support without a plastic frame.
Glass Furniture: Bonding glass shelves, display cases, and trophies where a crystal-clear, high-strength bond is required.
Scientific Glassware: Sealing glass components in laboratories where chemical resistance and heat stability are necessary.
Specialty Glazing: Use in glass-to-glass butt joints for architectural interior partitions.
To get the most out of your Wacker 121 Aquarium Silicone Sealant from Poly Prime Industry, follow these professional application steps:
Glass must be 100% free of dust, grease, and fingerprints. We recommend cleaning the edges with Isopropyl Alcohol (IPA) or a specialized glass cleaner. A clean surface is the difference between a 2-year bond and a 20-year bond.
For the cleanest look, use masking tape on both sides of the joint. This allows you to tool the silicone and remove the excess without leaving a “haze” on the glass.
Cut the nozzle at a 45-degree angle to the desired bead width. Apply constant pressure to the caulking gun, ensuring the silicone is pushed deep into the joint to eliminate air bubbles.
Tool the joint within 5-10 minutes (before the “skin” forms). Wacker 121 Aquarium Silicone Sealant cures at a rate of approximately 2-3mm per 24 hours. Do not fill the tank with water until the sealant is fully cured through the entire thickness of the joint.
As a leading distributor in Delhi (Krishna Nagar), Poly Prime Industry isn’t just a supplier; we are your technical partner.
Fresh Inventory: Silicone has a shelf life. We ensure our stock of Wacker 121 is always fresh, ensuring maximum shelf life and performance for your projects.
Genuine German Technology: We guarantee 100% original Wacker products. No dilutions, no fakes.
Wholesale Pricing: We cater specifically to bulk buyers, aquarium shops, and contractors with competitive pricing that retail stores can’t match.
Expert Support: Not sure if 121 is right for your glass thickness? Our team provides the technical guidance you need to choose the right Wacker grade.
| Property | Value |
| Curing System | Acetoxy (Acid Cure) |
| Consistency | Non-sag paste |
| Skin Formation Time | Approx. 10-15 minutes |
| Curing Rate | 2-3 mm / day |
| Hardness (Shore A) | Approx. 25 |
| Temperature Resistance | -40°C to +150°C |
| Available Size | 300ml Cartridge |
| Color | Transparent / Clear |
Q1: Can I use Wacker 121 Aquarium Silicone Sealant for structural glazing on buildings?
While Wacker 121 has incredible strength, it is optimized for glass-to-glass bonding. For building facades and structural glazing involving aluminum frames, we recommend Wacker SG79.
Q2: How long should I wait before adding fish to a new tank?
You must wait until the acetic acid smell (vinegar-like odor) is completely gone. This usually takes 48-72 hours depending on the bead thickness. We always recommend a “leak test” with plain water for 24 hours before adding livestock.
Q3: Does Wacker 121 stick to plastic or acrylic?
Wacker 121 is specifically designed for glass. Its adhesion to acrylic (plexiglass) is limited. For plastic-based tanks, a neutral-cure specialty silicone is usually required.
Q4: How can I identify genuine Wacker 121?
Original Wacker cartridges have clear batch coding, high-quality printing, and are distributed through authorized channels like Poly Prime Industry. Always check the seal on the nozzle.
Whether you are a hobbyist building your dream reef tank or a commercial fabricator handling bulk orders, Wacker 121 Aquarium Silicone Sealant provides the peace of mind that only German engineering can offer.
