DOWSIL 3145/CLEAR (305-ml-Cart)

DOWSIL™ 3145 RTV MIL-A-46146 Adhesive Sealant – Clear

Overview

DOWSIL™ 3145 RTV MIL-A-46146 Adhesive Sealant – Clear is a one-part, moisture-curing silicone adhesive sealant designed for high-reliability aerospace and electronic applications. This non-flowing, clear RTV silicone provides excellent tensile strength, tear resistance, elongation, and electrical insulation properties while curing at room temperature without the need for mixing or oven curing. The product is qualified to MIL-A-46146 Group II Type I requirements and is widely used for sealing, bonding, and protecting electronic assemblies.

Key Technical Specs

• Product Type: One-part RTV silicone adhesive sealant
• Colour: Clear
• Cure System: Moisture cure, room temperature vulcanising (RTV)
• Specific Gravity (Cured): 1.10
• Tack-Free Time: Approximately 64 minutes at 25°C
• Tensile Strength: 864 psi
• Elongation: 626%
• Tear Strength: 223 ppi
• Hardness: Shore A 45.6
• Dielectric Strength: 485 volts/mil
• Volume Resistivity: 4.4 × 10¹⁴ ohm·cm
• Non-Volatile Content: 96.9%

Approvals & Specifications

• MIL-A-46146 Group II Type I qualified
• Designed for military and aerospace electronic assembly applications

Typical Applications

• Sealing openings in electronic modules and housings
• Assembly and retention of components on printed wiring boards (PWB)
• Sealing around electrical leads, connectors, and wire penetrations
• Environmental protection of sensitive electronic assemblies
• General aerospace and defence RTV sealing applications

Compatibility & Safety Notes

• Provides unprimed adhesion to many metals, ceramics, glass, laminates, and engineering plastics
• Not generally recommended for polyethylene, polypropylene, PTFE (Teflon®), or other low-surface-energy materials without surface treatment
• Surface preparation is critical for optimum adhesion
• Not intended for continuous immersion in fuels or solvents
• Refer to the Safety Data Sheet (SDS) before handling

Packaging & Procurement

• Available in multiple package sizes
• Supplied ready to use with no mixing required
• Suitable for automated dispensing and manual application

Why This Product is Chosen for AOG / MRO

• Room-temperature cure eliminates the need for ovens and specialised curing equipment
• Excellent flexibility helps absorb vibration and thermal expansion stresses
• High dielectric properties support electrical insulation and environmental sealing
• MIL-qualified performance supports aerospace and defence maintenance requirements
• Fast handling times improve maintenance and production throughput

Practical Suggestions for Your Team (AOG Mindset)

• Ensure surfaces are thoroughly cleaned and degreased before application
• Use light abrasion where permitted to improve bond strength
• Allow adequate humidity exposure to achieve full cure
• Apply mild heat below 60°C when accelerated curing is required
• Perform adhesion testing on new substrates before production use

Manufacturer / Aviation Spec Codes

• Product Name: DOWSIL™ 3145 RTV MIL-A-46146 Adhesive Sealant – Clear
• Product Type: RTV silicone adhesive sealant
• Military Specification: MIL-A-46146 Group II Type I
• Technology: Polydimethylsiloxane (PDMS) silicone
• Cure Mechanism: One-part moisture cure