Loctite 5039 Nuva-Sil Silicone Adhesive, 300mL (Part Number 742348)

Product Name

Loctite 5039 Nuva-Sil Silicone Adhesive, 300mL (Part Number 742348)

Brief Description

Loctite SI 5039 Nuva-Sil is a light yellow, translucent, semi-flowable, acetoxy silicone sealant paste. It features a unique dual-cure mechanism, primarily curing rapidly under UV or visible light, and offering a secondary moisture cure for areas shadowed from light exposure. This product forms a high-strength rubber, making it ideal for gasketing, sealing, and bonding applications.

Popular Applications & Uses

- Gasketing and sealing applications- Potting electrical connectors and components- Lead termination- Sealing lenses to housings- Bonding flexible components- Gasketing electrical enclosures- Seam sealing- Glass bonding- Sealing headlamps- Moisture barrier sealing- Cure-in-place gasketing

Industries that Commonly Use It

- Aerospace/Defense- Automotive Service/Repair- Construction/ Building Services- General Manufacturing- Government & Military- LED/Electronics- Metal Fabrication- Plastic Fabrication- Transportation/ Specialty Vehicle

Special and Unique Features

- Deep light cure capability (UV/visible light) for rapid processing- Secondary moisture cure mechanism for shadow curing, ensuring complete cure in complex geometries- Forms a high-strength, flexible rubber- Cures tack-free in seconds under UV or visible light- One-component system, requiring no mixing- Forms soft, non-yellowing, translucent elastomers- Offers superior weather, temperature, moisture, and corrosion resistance- Facilitates even knit lines, promoting continuous beads

Key Properties

- Technology: Silicone- Chemical Type: Acetoxy dual-cure silicone- Appearance (uncured): Light yellow, translucent paste- Fluorescence: Positive under UV light- Cure Type: Ultraviolet (UV) / Visible light and secondary moisture cure- Full Cure Time: 72 hours (moisture cure), 7 days (full cure)- Physical Form: Semi-flowable paste- Container Size: 300 mL cartridge- Odor: Acetic Acid- Number of Components: One- Specific Gravity: 1.05- Elongation at Break: ≥150%- Tensile Strength: ≥1 N/mm² (145 psi)- Shore Hardness: 32 to 48 Shore A (flexible)- VOCs Content: 3.5%- Temperature Range: -65°F to 350°F (-54°C to 177°C)

Surface Compatibility

- Glass- Metal- Ceramic- Plastic

Known backups / known substitutes

- Loctite SI 5240 (flowable, UV/visible + neutral moisture cure)- Loctite SI 5248 (self-leveling, UV silicone for glass, metals)- Loctite SI 5033 (non-sagging, UV + secondary moisture cure)- Loctite SI 5905 (form-in-place gasket/sealant)- ASI 335 Neutral Cure RTV Silicone- American Sealants ASI 502 100% RTV Silicone- ASI 388 Electronic Grade Silicone Adhesive- Elastosil N198 (Wacker)- Black-Seal Special Silicone (WEICON)

Comparison Note

Loctite 5039 Nuva-Sil distinguishes itself with its advanced dual-cure system, offering the speed of UV/visible light curing for high-volume production and the reliability of a secondary moisture cure to ensure complete sealing in shadowed or complex areas. This combination provides a high-strength, flexible, and environmentally resistant bond, making it a versatile solution for demanding industrial applications.