Discover or rediscover DOWSIL™ 732, the essential versatile acetoxy silicone sealant.

DOWSIL™ 732 continues to stand out by offering a versatile solution that complies with the strictest standards. This room-temperature-curing sealant is approved according to FDA, MIL-A-46106, NSF 51, and NSF 61 rigorous standards.

Features and benefits of DOWSIL™ 732

 

  • One-part adhesive/sealant
  • Cures at room temperature when exposed to air humidity
  • Acetoxy cure system
  • Thixotropic
  • Easy to apply
  • Cures to form a solid and flexible rubber
  • Good adhesion to many substrates
  • Stable and flexible from -60 °C to +180 °C, with short peaks up to +205 °C
  • Black version: stable and flexible from -60 °C to +205 °C, with short peaks up to +230 °C
  • Excellent dielectric properties
  • Compliant with MIL-A-46106, FDA 177.2600 standards
  • Available in white, black, transparent, and aluminum

 

Applications of DOWSIL™ 732  :

 

  • General industrial sealing and joint applications
  • Compliant with MIL-A-46106 and FDA 177.2600 standards 

 

Here are some concrete examples of DOWSIL™ 732 usage in various industries:

  • In the food industry, DOWSIL™ 732 is used for sealing wine fermentation tanks, grinders, and mixers, ensuring food hygiene and safety.
  • In the aerospace industry, DOWSIL™ 732 is used to seal external joints of aircraft, protecting them from the elements and ensuring safety.
  • In the maritime industry, DOWSIL™ 732 is used to seal ship portholes, protecting the interior from water and humidity.
  • In the household appliance industry, DOWSIL™ 732 is used for sealing and bonding oven doors, ensuring user safety and preventing leaks.

 

DOWSIL™ 732 is a reliable and high-performance product that offers a wide range of industrial applications.

Technical properties of DOWSIL™ 732

 

Property Unit Result
Mechanical properties, cured 7 days in air at 25°C (77°F) and 50% relative humidity
Specific gravity 1,04
Durometer hardness Shore A 25
Tensile strength MPa 2,3
Elongation at break % 540
Volume coefficient of thermal expansion 1/K 1.12×10-3
Electrical properties, cured 7 days in air at 25°C (77°F) and 50% relative humidity
Dielectric strength kV/mm 21.6
Dielectric constant at 100 Hz/100 kHz 2.8
Dissipation factor at 100 Hz/100 kHz 0.0015
Volume resistivity Ohm.cm 1.5×1015

The importance of proper surface preparation before applying DOWSIL™ 732:

 

All surfaces must be clean and dry. Degrease and remove any contaminants that may affect adhesion. Socomore brand solvents are highly suitable.

Primerless adhesion can be achieved on many substrates such as glass, metals, and most technical plastics. Substrates where good adhesion is generally not achieved include PTFE, polyethylene, polypropylene, and related materials.

However, for maximum adhesion, the use of DOWSIL™ 1200 OS primer is recommended. After solvent cleaning, apply a thin layer of DOWSIL™ 1200 OS primer by dipping, brushing, or spraying. Allow the primer to dry for 15 to 90 minutes at room temperature and a relative humidity of 50% or more.

How to apply DOWSIL™ 732:

 

Apply the multipurpose DOWSIL™ 732 sealant on one of the prepared surfaces, then quickly cover it with the other substrate to be bonded.

Upon contact with moisture, the freshly applied material will form a “skin.” All smoothing should be done before this skin forms. The surface can be easily smoothed with a spatula. The adhesive/sealant will be dry to the touch in less than 45 minutes.

Curing time:

After the skin forms, curing continues inward from the surface. In 24 hours (at room temperature and 50% relative humidity), the multipurpose DOWSIL™ 732 sealant will cure to a depth of about 3 mm. Very deep sections, especially when access to atmospheric moisture is restricted, will take longer to cure completely. Curing time is extended at lower humidity levels.

Before handling and packaging bonded components, users are advised to wait a sufficiently long time to ensure the integrity of the adhesive is not affected. This will depend on many factors and should be determined by the user for each specific application.

More info
For more information on DOWSIL™ 732 acetoxy silicone or the entire DOWSIL™ product range, contact our technical service by phone at 04 26 680 680 or fill out our contact form. Download our dedicated selection guide for industrial silicone sealants.
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Documentation
Guide de sélection silicone à usage industriel
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