Soudal Silirub 2 Low Modulus Neutral Cure Silicone Sealant

Soudal Silirub 2 is a premium low modulus neutral cure silicone sealant used throughout the glazing industry. It cures without releasing acetic acid, which means no vinegar smell and no risk of corrosion to sensitive materials like coated glass, mirror backing, or metal frames. That combination of neutral cure chemistry and low modulus flexibility makes Silirub 2 one of the most trusted glazing silicones available, and the reason hundreds of glazing companies specify it by name.

Low modulus means the cured sealant remains soft and flexible rather than stiff. In glazing applications, this matters. Glass and frames expand and contract with temperature changes, and a high modulus sealant will crack or pull away from the substrate over time. Silirub 2 moves with the joint rather than fighting it, which is why it holds up so well in long-term exterior applications.

Where Soudal Silirub 2 Gets Used

Silirub 2 is the go-to neutral cure silicone sealant for UPVC window and door installations, curtain walling, conservatory glazing, and structural glass work. It bonds reliably to glass, UPVC, powder-coated aluminium, anodised aluminium, and most common glazing substrates without a primer on clean, dry surfaces. Glaziers, fenestration contractors, and shopfitters all reach for it when the job calls for a sealant that will still look and perform well years down the line.

It is equally useful for interior glazing work where neutral cure is required to protect mirror backing or sensitive coatings. If you have ever used an acetoxy cure silicone near a mirror and watched the backing discolour, you will appreciate why neutral cure is the correct choice. Silirub 2 removes that risk entirely.

Colour Options

Silirub 2 is available in four colours to suit the most common frame finishes: clear, white, black, and anthracite. The anthracite option has become increasingly specified as grey UPVC and aluminium systems have grown in popularity, so it is a useful stock item for any glazing contractor working with modern domestic or commercial installations.

Soudal is a well-established manufacturer in the sealants market, and Silirub 2 sits firmly at the top of their silicone range. It meets the performance demands of professional glazing work, carries the relevant approvals for structural and weather-seal applications, and has been a consistent choice for the trade for many years. If you are pricing a glazing job and want a sealant that will not come back to haunt you, this is the one to specify. It costs a little more than entry-level silicones, but it earns that difference in reliability and finish quality.

Available here at a trade-friendly price, Soudal Silirub 2 neutral cure silicone sealant is a straightforward specification for any glazing contractor who takes the finish and longevity of their work seriously.