DOWSIL 732 MULTI-PURPOSE SEALANT
Harmonization Code : 3506.91.90.99 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other
Main features
- One-Part Moisture-Cure Sealing
- Thermal Stability for Sealing
- Non-Sag Placement Control
Product Description
DOWSIL™ 732 Multi-Purpose Sealant is a one-part, general-purpose silicone adhesive and sealant. It utilizes an acetoxy cure system to cure at room temperature when exposed to atmospheric moisture, forming a tough, flexible rubber. Available in white, black, clear, and aluminum, it features a non-sag paste consistency that makes it easy to apply for various bonding and sealing needs.
Product Key Features
- One-Part Moisture Cure - cures at room temperature upon exposure to moisture in the air, offering a skin-over time of 7 minutes and a tack-free time of 20 minutes.
- Thermal Stability - remains stable and flexible from -60°C to +180°C, with short peaks up to +205°C[cite: 1595, 1596]. The black version offers extended stability up to +205°C, with short peaks up to +230°C.
- Mechanical & Electrical Profile - delivers a Shore A hardness of 25, a tensile strength of 2.3 MPa, an elongation of 540%, and excellent dielectric properties.
- Regulatory Compliance - complies with MIL-A-46106 and FDA 177.2600 specifications.
- Non-Sag Rheology - maintains a non-slump paste consistency, ensuring it remains in place during application.
Applications
This sealant is ideal for general industrial sealing and bonding applications where a durable, flexible rubber seal is required.
- General Industrial Bonding - provides good, unprimed adhesion to many substrates such as glass, metals, and most common engineering plastics.
- High-Temperature Environments - suitable for assemblies experiencing extreme temperature fluctuations requiring continuous thermal stability.
- Regulated Applications - can be confidently used in settings requiring compliance with FDA 177.2600 or MIL-A-46106 standards.
Technical Specifications
General Properties
ColorColor
White, black, clear or aluminumSpecific GravitySpecific Gravity
1.04Physical Properties
ViscosityViscosity
821,000 mPa.sMechanical Properties
ElongationElongation
540 %Physical Properties
Skin TimeSkin Time
7 minutesTack-Free TimeTack-Free Time
20 minutesElectrical Properties
Dielectric StrengthDielectric Strength
21.6 kV/mmVolume ResistivityVolume Resistivity
1.5e15 Ohms⋅cmAdditional Information
General Purpose Silicone Adhesive / Sealant
DOWSIL™ 732 Multi-Purpose Sealant
DOWSIL™ 732 Multi-Purpose Sealant is a premier one-part silicone adhesive and sealant engineered for a diverse range of general industrial sealing and bonding applications. Operating via an acetoxy moisture-cure mechanism, this non-sag paste cures efficiently at room temperature upon exposure to atmospheric moisture, transforming into a tough, highly flexible silicone rubber. It provides excellent dielectric properties, stable performance across wide temperature configurations, and robust unprimed adhesion to many common substrates. Fully compliant with military specification MIL-A-46106 and FDA 177.2600 regulations, it ensures long-term joint reliability for demanding manufacturing and maintenance frameworks.
One-part moisture cure 7 min skin-over time MIL-A-46106 Compliant FDA 177.2600 Compliant
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Typical values only. Performance metrics are measured following full moisture activation under standard room temperature settings.
DOWSIL™ 732 Multi-Purpose Sealant
Key Features
- One-part RTV formulation requires no pre-mixing equipment, optimizing factory process lines and minimizing waste.
- Thixotropic non-sag paste consistency tracks cleanly and stays in place on vertical or overhead joints.
- Cures to a tough, highly flexible silicone rubber capable of resolving substrate thermal expansion differentials.
- Excellent unprimed adhesion profiles over glass, ceramics, common metals, and engineering plastics.
- Outstanding dielectric performance parameters coupled with high volume resistivity (1.5x10¹⁵ Ohm-cm).
- Certified to meet military specification MIL-A-46106 and FDA 177.2600 food-contact criteria.
Processing Summary
Color Assortment: Produced in a versatile industrial palette of white, black, clear, and aluminum variants to perfectly coordinate with design aesthetics.
Skin-Over & Tack Windows: Surface skin formation starts rapidly in 7 minutes at 25°C. Transitions to a complete tack-free state within 20 minutes. Tooling should be completed with a spatula before skinning occurs.
Inward Cure Progress: Cross-linking moves inward from the exposed surface at 25°C and 50% RH, achieving a cure depth of roughly 3 mm within 24 hours. Confinement or lower humidity extends this duration.
Thermal Endurance Profiles: Standard configurations maintain flexibility from -60°C to 180°C with short peaks to 205°C. The black version delivers enhanced resistance from -60°C to 205°C with peaks to 230°C.
Handling and Application Guidance
Process Notes
Storage and Shelf Life
- Store raw materials at or below 32°C (90°F) in original, unopened containers.
- Keep containers tightly closed when not in use, as the product cross-links via reaction with air moisture.
- A cured plug of material may form in the nozzle tip during storage; this is easily removed and does not harm contents.
- Track stock rotation based on the formal "Use Before" date printed on the container labels.
Surface Preparation
- Joint boundaries must be completely clean and dry prior to sealant extrusion.
- Degrease and clear contaminants using isopropyl alcohol, acetone, or methyl ethyl ketone (MEK).
- While unprimed adhesion is excellent on glass and metals, it will not normally bond to PTFE, PE, or PP.
- For maximum adhesion, wipe with solvent, then apply a thin coat of DOWSIL™ 1200 OS Primer and let dry for 15-90 minutes.
Substrate Compatibility Note
- The acetoxy cure chemistry releases a small amount of acetic acid vapor as a by-product during vulcanization.
- This acetic acid byproduct can potentially cause corrosion on certain sensitive metallic parts or sub-assemblies.
- Avoid processing this sealant inside totally enclosed or confined configurations where vapor by-products cannot escape.
- Before handling and packaging parts, allow a sufficiently long dwell time to protect adhesive seal integrity.
Typical Properties
Engineering Data for DOWSIL™ 732
Uncured Physical Properties
| Physical Property | Typical Engineering Value | Corporate Test Method (CTM) / Condition |
|---|---|---|
| Appearance | Non-slump paste | CTM 0176 |
| Color Assortment | White, black, clear, or aluminum | CTM 0176 |
| Extrusion Rate | 350 g/minute | Measured using 3.2 mm orifice at 0.62 MPa (CTM 0364) |
| Viscosity (Low Shear - 1/s) | 821 Pa-sec | CTM 1377 |
| Viscosity (High Shear - 10/s) | 168 Pa-sec | CTM 1377 |
Cured Mechanical & Electrical Properties
Properties measured following a full 7-day cure in air at 25°C (77°F) and 50% relative humidity.
| Elastomeric Parameter | Typical Engineering Value | Test Standard Basis (ASTM / CTM) |
|---|---|---|
| Specific Gravity | 1.04 | ASTM D1475 / CTM 0097B |
| Durometer Hardness | 25 Shore A | ASTM D2240 / CTM 0099 |
| Tensile Strength | 2.3 MPa | ASTM D412 / CTM 0137A |
| Elongation at Break | 540 % | ASTM D412 / CTM 0137A |
| Volume Coefficient of Thermal Expansion | 1.12 x 10⁻³ 1/K | CTM 0420 |
| Dielectric Strength | 21.6 kV/mm | ASTM D149 / CTM 0114 |
| Dielectric Constant (Permittivity) | 2.8 | Evaluated at 100 Hz to 100 kHz (ASTM D150 / CTM 0112) |
| Dissipation Factor | 0.0015 | Evaluated at 100 Hz to 100 kHz (ASTM D150 / CTM 0112) |
| Volume Resistivity | 1.5 x 10¹⁵ Ohm-cm | ASTM D150 / CTM 0112 |
Applications
Where DOWSIL™ 732 Fits
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Industrial Sealing & Bonding
Perfect for a vast array of general multi-material manufacturing joins and maintenance procedures across production facilities.
- Ready-to-use general purpose silicone paste adhesive.
- Bonds tight to glass, metals, and engineering plastics.
- Easy toolability with a spatula for neat, aesthetic beads.
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Regulated Assemblies
Extensively tested and recognized under international agency standards to support highly specific defense and commercial guidelines.
- Fully complies with military standard MIL-A-46106.
- Meets strict FDA 177.2600 food-contact criteria.
- Ensures strict material tracking and verified compliance.
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Thermal & Flexible Joints
Forms a tough, flexible rubber skin with 540% elongation to accommodate structural movements and mechanical vibrations.
- Excellent environmental sealing and moisture blocking.
- Dielectric breakdown protection tracks at a strong 21.6 kV/mm.
- Absorbs relative shifting between dissimilar joint materials.
Product Demo
See One-Part Moisture-Curing Silicone Paste Dispensing Methods
Observe the high-precision processing of one-part non-flowing general-purpose silicone adhesive sealants via automated needle dispensing setups. This practical reference highlights best practices for balancing track extrusion parameters, checking non-slump bead profiles, and verifying surface handling stability before complete room temperature cross-linking completes.
Package & Support
Standard Packaging & Technical Help
Standard Packaging
- Available across multiple standard industrial container net weight classes.
- Supplied ready-to-use for direct extrusion without multi-part manual blending steps.
- Packaging configurations safeguard raw material against air moisture contamination.
Technical Help Capabilities
- Assisting manufacturing loops with room-temperature setup to bypass thermal oven operating costs.
- Evaluating substrate material groups to optimize unprimed dính bám on engineering plastics.
- Configuring automated needle dispensing parameters to coordinate with the specified 350 g/min extrusion rate.
- Providing formal compliance certificates and safety parameters verifying MIL and FDA approvals.
Technical Guidance
Tips and Troubleshooting
| Issue | Recommended Action |
|---|---|
| Premature layer skinning or surface tearing during finishing tooling steps |
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| Incomplete structural cross-linking down through joint core zones |
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| Adhesion tracking breakdown or low lap shear force values over difficult substrates |
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Next Steps
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