Soudasil 400N1 - 12 Count

Soudasil 400N1 Neutral Cure Silicone Sealant — Premium Grade for Siding, Window & Metal Roof Applications

Soudasil 400N1 is a VOC-compliant, one-part, 100% neutral cure silicone sealant formulated for the siding, window, and metal roof market. It is engineered for contractors performing perimeter weathersealing, field glazing, window and door installations, and primary backbedding applications. The product cures in the presence of moisture to deliver excellent resistance to cold, rain, ozone, heat, and sunlight. Its primerless adhesion to a wide range of substrates — including vinyl, wood, aluminum, brick, concrete, fiber cement, and metal roofing — makes it a versatile choice for building envelope work.

Technical Specifications

Compliance & Certifications

Soudasil 400N1 distinguishes itself from acetoxy-cure silicones by using a neutral cure chemistry that eliminates the acetic acid off-gassing associated with standard silicones, making it safe for use on sensitive substrates such as metals and coated surfaces. Its broad compliance with ASTM C 920 Class 50 and multiple AAMA standards gives contractors the documentation needed for commercial and specification-driven projects. The wide application temperature range of -35°F to 140°F extends its usability across climates and seasons without requiring special handling.

Key Features & Benefits

100% Neutral Cure Chemistry

Unlike acetoxy silicones, Soudasil 400N1 releases no corrosive byproducts during cure, making it safe for use on metals, coated aluminum, and other sensitive substrates. This eliminates the risk of substrate staining or corrosion that can occur with standard silicones.

Primerless Adhesion to Multiple Substrates

The sealant bonds directly to vinyl, wood, aluminum, brick, concrete, fiber cement, and metal roofing without requiring a primer on non-porous surfaces. This reduces prep time and material cost on the job site. For porous surfaces, Primer 150 is recommended; Soudal Surface Activator can further improve adhesion on smooth surfaces.

+/- 50% Joint Movement Accommodation

With a rated movement capability of +/- 50% and 500% elongation at break, this sealant handles significant thermal expansion and structural movement without cracking or debonding. This is critical for joints between dissimilar building materials that expand and contract at different rates.

Excellent Moisture and Mold Resistance

The cured sealant provides strong resistance to moisture infiltration, mold, rain, and ozone — essential performance characteristics for exterior building envelope applications. Contractors can rely on long-term weathertight performance in exposed conditions.

Wide Service and Application Temperature Range

Rated for service from -40°F to 325°F and application from -35°F to 140°F, Soudasil 400N1 can be installed in cold-weather conditions and will perform in high-heat environments such as metal roofing. This flexibility reduces project delays due to weather constraints.

Low Odor and Easy Application

The low-odor formulation improves working conditions in enclosed or partially enclosed spaces such as window bays and interior glazing areas. The product is compatible with both manual and pneumatic caulking guns and tools easily with soapy water before skinning.

Common Applications

Window Glazing and Installation

Designed as a perimeter weatherseal for field glazing and window installation, Soudasil 400N1 provides a durable, flexible seal around window frames in both new construction and replacement applications.

Door Perimeter Sealing

Suitable for sealing door frames to surrounding substrates, accommodating movement between the frame and wall assembly while maintaining a weathertight barrier.

Metal Roof Sealing

Formulated specifically for the metal roof market, it seals joints, penetrations, and transitions on metal roofing systems where thermal movement and UV exposure demand a high-performance sealant.

Siding Joints

Seals joints between siding panels and adjacent building materials including vinyl, fiber cement, and wood siding, accommodating the high movement typical of these assemblies.

Primary Backbedding Compound

Can be used as a primary backbedding compound in glazing applications, providing a flexible, moisture-resistant bed for glass units.

Building and Construction Joints with High Movement

Appropriate for joints between dissimilar building materials where differential movement is expected, such as transitions between concrete, masonry, and metal components.

Compatible Materials

• Vinyl (PVC profiles)
• Wood (including treated wood)
• Aluminum (including aluminum framing)
• Brick
• Concrete
• Fiber cement
• Metal roofing
• Glass
• Most edge seals of insulating double glazing
• Conventional PVB films
• All usual building surfaces (clean, dry, free of dust and grease)

Product Documents

• Soudasil 400N1 Technical Data Sheet / SDS

Application Instructions

Surface Preparation

1. Ensure all surfaces are clean, dry, and free of dust, grease, and loose material.
2. For porous surfaces, apply Primer 150 before sealant application.
3. For smooth non-porous surfaces, no primer is required; however, applying Soudal Surface Activator will improve adhesion.
4. Conduct a preliminary compatibility test on PVD and powder-coated materials before full application.

Joint Sizing

1. Size joints to a minimum width of 1/4" and maximum width of 1 3/16".
2. Maintain a minimum depth of 1/5".
3. Follow the recommended ratio: width = 2 x depth.

Sealant Application

1. Load cartridge into a manual or pneumatic caulking gun.
2. Apply sealant continuously into the prepared joint, ensuring full contact with both joint faces.
3. Tool the sealant with soapy water before skinning occurs (tack-free time: approximately 20 minutes).

Clean Up

1. Remove uncured sealant immediately using white mineral spirit.
2. Cured sealant must be removed mechanically.
3. Repair any defects using Soudasil 400N1.

Safety Data Summary

Hazard Information

• Direct contact with uncured sealant irritates eyes and may irritate skin.
• Overexposure to vapor may irritate eyes, nose, and throat.
• Keep out of reach of children.
• Not for use on natural stones such as marble or granite — risk of staining.
• Not recommended for use on polycarbonate (PC) or PMMA — may cause crazing (stress cracking).
• Do not use as a structural glazing adhesive.

Personal Protective Equipment

• Avoid skin and eye contact with uncured sealant.
• Use appropriate eye protection and gloves when handling uncured product.

Safe Handling

• In case of eye contact: flush eyes with warm water for 15 minutes and call a physician.
• In case of skin contact: remove uncured sealant with a paper towel.
• If swallowed: do not induce vomiting; call a physician immediately.
• Store in unopened packaging at 41°F–77°F in a cool, dry location.
• Avoid storage in excessive heat or high humidity — may reduce shelf life by up to 30%.
• Refer to the full Safety Data Sheet (SDS) for complete hazard and handling information.
• Manufactured for professional use only.

Frequently Asked Questions

Q: Does Soudasil 400N1 require a primer on all surfaces?
A: No. Primerless adhesion is provided on non-porous surfaces including vinyl, aluminum, glass, and metal. Primer 150 is recommended for porous surfaces such as concrete, brick, and wood. Soudal Surface Activator can be used on smooth surfaces to further improve adhesion.

Q: Can Soudasil 400N1 be used on natural stone such as marble or granite?
A: No. The datasheet specifically states it should not be used on natural stones like marble or granite due to the possibility of staining.

Q: Is Soudasil 400N1 suitable for use on polycarbonate (PC) or acrylic (PMMA) substrates?
A: No. It is not recommended for use on PC or PMMA because it can cause crazing (stress cracking) on these materials.

Q: What is the maximum joint width this sealant can accommodate?
A: The maximum joint width is 1 3/16", with a minimum width of 1/4" and minimum depth of 1/5". The recommended ratio is width equal to twice the depth.

Q: What standards does Soudasil 400N1 meet?
A: It meets ASTM C 920 (Type S, Grade NS, Class 50), AAMA 802.3-92 TI and TII, AAMA 803.3-92 TI, AAMA 805.2-92, and Federal Specifications TT-S-00230C and TT-S-001543A.

Q: Can Soudasil 400N1 be used as a structural glazing adhesive?
A: No. The product datasheet explicitly states it should not be used as a structural glazing adhesive.