Dowsil DOWSIL-732-ALUMINIUM (90-ml-Tube)

DOWSIL™ 732 Multi-Purpose Sealant

Overview

DOWSIL™ 732 Multi-Purpose Sealant is a one-part silicone adhesive and sealant designed for general-purpose industrial bonding and sealing applications. Utilizing an acetoxy cure system, it cures at room temperature upon exposure to atmospheric moisture to form a durable, flexible silicone rubber. The sealant provides excellent adhesion to many substrates, outstanding temperature resistance, and strong dielectric properties, making it suitable for aerospace, industrial, electrical, and maintenance applications.

Key Technical Characteristics

• Product Type: One-part silicone adhesive/sealant
• Cure System: Acetoxy moisture cure
• Consistency: Non-sag paste
• Available Colors:
  • White
  • Black
  • Clear
  • Aluminum
• Skin-Over Time: Approximately 7 minutes
• Tack-Free Time: Approximately 20 minutes
• Extrusion Rate: 350 g/min
• Service Temperature Range:
  • Standard Colors: -60°C to +180°C
  • Short-Term Peaks: Up to +205°C
  • Black Version: Continuous up to +205°C with short peaks to +230°C
• Specific Gravity: 1.04
• Shore A Hardness: 25

Core Performance Benefits

• One-component formulation simplifies application
• Cures at room temperature without mixing
• Forms a tough and flexible silicone rubber seal
• Excellent adhesion to many common substrates
• Outstanding resistance to temperature extremes
• High elongation allows movement accommodation
• Excellent electrical insulation and dielectric performance
• Suitable for sealing, bonding, and gasketing applications

Typical Applications

• General industrial sealing operations
• Bonding and assembly applications
• Electrical insulation and sealing
• Aerospace maintenance and repair
• Equipment housing and enclosure sealing
• Glass-to-metal bonding
• Industrial gasketing applications
• Environmental sealing of components and assemblies

Material Engineering & Design Features

DOWSIL™ 732 is formulated as a moisture-curing silicone elastomer that develops a flexible, durable bond while maintaining performance across a wide temperature range. The cured material combines flexibility, adhesion, and electrical insulation properties, making it suitable for both structural and environmental sealing applications.

Typical cured mechanical properties include:

• Tensile Strength: 2.3 MPa
• Elongation at Break: 540%
• Shore A Hardness: 25
• Volume Coefficient of Thermal Expansion: 1.12 � 10?� /K

Typical electrical properties include:

• Dielectric Strength: 21.6 kV/mm
• Dielectric Constant: 2.8
• Dissipation Factor: 0.0015
• Volume Resistivity: 1.5 � 10�? Ohm�cm

The sealant complies with:

• MIL-A-46106
• FDA 177.2600

Installation & Handling

• Ensure all surfaces are clean, dry, and free from contaminants
• Suitable cleaning solvents include:
  • Isopropyl alcohol
  • Acetone
  • Methyl ethyl ketone (MEK)
• Apply directly to one prepared surface before joining components
• Tool sealant before skin formation occurs
• DOWSIL™ 1200 OS Primer may be used to maximize adhesion on challenging substrates
• Typical cure depth: approximately 3 mm in 24 hours at 25°C and 50% relative humidity
• Allow sufficient cure before handling or packaging bonded assemblies

Environmental & Compliance Notes

• Store at or below 32°C in original unopened containers
• Keep containers tightly sealed when not in use
• Releases small amounts of acetic acid during curing
• May cause corrosion on some metallic substrates in enclosed curing environments
• Dispose of material according to applicable local regulations
• Not tested or represented for medical or pharmaceutical applications
• Review Safety Data Sheet (SDS) before use

Key Advantages

• Easy-to-use one-part silicone system
• Excellent flexibility across extreme temperatures
• Strong adhesion to many industrial materials
• High dielectric performance for electrical applications
• Suitable for both sealing and bonding applications
• Fast skin-over and handling characteristics
• Complies with military and FDA specifications
• Reliable long-term durability in demanding environments