DOWSIL 732 Multi Purpose Sealant, 1K Silicone Sealant and Adhesive

Short description

DOWSIL 732 is a one-component silicone sealant and adhesive (RTV) for universal sealing and bonding applications in industrial environments. The material is non-sag (non-slumping), easy to apply, and cures at room temperature through exposure to atmospheric moisture into a tough, permanently elastic rubber . Available in white and transparent (clear to translucent).

Your advantages with DOWSIL 732

• 1K, ready to use: no mixing, no pot life, direct application
• Non-sag: ideal for vertical joints and gaps
• Fast skin formation: Skin over typ. approx. 7 minutes, tack free typ. approx. 20 minutes
• Permanently elastic and robust: cures to a tough, flexible rubber
• Wide temperature range: stable and flexible from minus 60 °C to plus 180 °C, briefly up to plus 205 °C
• Good electrical insulation: excellent dielectric properties
• Standards and conformity: meets, among others, MIL A 46106 as well as requirements according to FDA 21 CFR 177.2600 (Rubber articles intended for repeated use)

White or transparent: which variant fits?

White

• When the joint is visible and should look optically clean
• Typical for housings, covers, apparatus construction, light-colored substrates

Transparent (clear to translucent)

• When the joint should remain as inconspicuous as possible
• Typical for glass, visible surfaces, transparent covers

Typical Applications

DOWSIL 732 is suitable for general industrial sealing and bonding, for example:

• Sealing of housings, covers, and feedthroughs against moisture and dust
• Elastic bonding, fixing, and joint sealing in the MRO environment
• Applications where sealing and electrical insulation are required simultaneously

Technical key data (typical values)

• Consistency: non-sag paste
• Extrusion rate: typ. 350 g/min
• Skin Over: typ. 7 min
• Tack Free: typ. 20 min
• Density: typ. 1.04
• Hardness: typ. Shore A 25
• Tensile strength: typ. 2.3 MPa
• Elongation at break: typ. 540 %
• Curing: approx. 3 mm in 24 h at room temperature and 50% RH

Processing instructions (for reliable adhesion)

1. Prepare the substrate: Clean and dry the surface, degrease and remove contaminating residues. Suitable solvents are, for example, isopropanol, acetone, or MEK.
2. Application and Joining: Apply the material to one surface, then join promptly.
3. Smoothing: finish tooling before skin formation.
4. Allow to cure: Curing proceeds from the outside inward; deep cross-sections require correspondingly more time.
5. Optimize adhesion: Unprimed adhesion is possible on many substrates. For maximum adhesion, Dow recommends the DOWSIL 1200 OS Primer.

Notes on material compatibility

• DOWSIL 732 is acetoxy-curing. During curing, by-products are formed (typically acetic acid odor). Check suitability for corrosion-sensitive metals and in closed volumes in the specific application.
• Good adhesion is possible on many substrates, typically critical are PTFE, PE, PP and related materials.