Silicone Soudal LMN

Soudal Silirub LMN – Neutral Cure Silicone Sealant

Soudal Silirub LMN is a professional-grade, low modulus neutral cure (LMN) silicone sealant engineered for high-movement joints across construction, glazing, and industrial applications. Formulated to bond without primer to the widest range of common building materials — including glass, metal, masonry, plastics, and wood — it delivers a durable, permanently elastic seal that copes with the natural expansion and contraction of building joints over time.

Its neutral cure chemistry means it releases no corrosive by-products during curing, making it a safe choice for sensitive substrates such as aluminium, galvanised steel, and painted or coated finishes that acidic (acetoxy) sealants can damage. The thick-bodied consistency gives excellent tool-ability and control, even on vertical or overhead joints, while a fast skinning and cure time keeps installation efficient on-site.

Silirub LMN stays flexible long after curing and holds its colour under prolonged UV exposure, with strong resistance to rain, snow, and temperature extremes. This combination makes it particularly well suited to perimeter sealing of window and door frames, roofline and drainage system joints, and weatherproofing of aluminium glazing systems, curtain walling, and façade panels.

Key Features

• Low modulus formula for high joint movement capability
• Neutral cure – safe on sensitive metals and coated surfaces
• Primerless adhesion to glass, metal, masonry, plastics, and wood
• Fast skinning and final cure time
• UV, rain, and snow resistant; stable across a wide temperature range
• Thick-bodied for excellent control and toolability
• Available in a range of colours to suit visible joints

Typical Applications

• Perimeter sealing of window and door frames
• Roofline and guttering joints
• Curtain walling and façade panels
• Aluminium glazing systems
• General high-movement construction joints

Usage Notes

• Apply with a standard caulking gun between +5°C and +35°C
• Tool with soapy water before the surface skins
• Clean uncured sealant with white spirit
• Not suitable for use on natural stone such as marble or granite, as it may cause staining

Frequently Asked Questions

Can Silirub LMN be used on aluminium and metal window frames?

Yes. As a neutral cure silicone, it releases no corrosive acids during curing, making it safe for aluminium, galvanised steel, and other metals that acetoxy (acid-cure) sealants can damage.

Is Soudal Silirub LMN suitable for high-movement joints?

Yes. Its low modulus formulation is specifically designed to accommodate greater joint movement than standard high modulus sealants, making it ideal for façade expansion joints and perimeter sealing.

Can I use Silirub LMN on natural stone?

No. It is not recommended for use on natural stone such as marble or granite, as it can cause staining.

How long does Silirub LMN take to cure?

It has a fast skinning time and final cure, allowing projects to proceed with minimal downtime compared to standard silicone sealants.