DOWSIL 736
Harmonization Code : 3919.10.80 | Other self-adhesive plastic rolls not exceeding 20 cm wide.
Main features
- Up to 260 deg C Continuous Service
- Non-Slumping Vertical/Overhead Application
- Flexible High-Temperature Silicone Sealing
Product Description
DOWSIL™ 736 Heat Resistant Sealant is a one-part, nonslumping silicone paste for high-temperature bonding, sealing, gasketing, potting, encapsulating and protective-coating applications. Atmospheric moisture cures the material at room temperature to a flexible rubbery solid. It supports continuous operation from -65 to 260°C and intermittent exposure to 315°C. The red, ready-to-use sealant can be applied on sidewalls and overhead surfaces and is used around appliance heating elements, industrial ovens, moving oven belts, aerospace gaskets and bag filters on smoke stacks.
Key features
- High-temperature service: Continuous operation to 260°C and intermittent exposure to 315°C.
- Nonslumping application: Will not sag or run on sidewalls or overhead surfaces.
- Ready-to-use moisture cure: One-part paste cures at room temperature when exposed to atmospheric moisture.
- Flexible cured rubber: Typical Shore A hardness of 26 and elongation of 600% after 72 hours of cure.
Applications
Heating-element sealing and encapsulation, aerospace gasketing, moving oven belts, industrial ovens, smoke-stack bag filters and other high-temperature bonding, sealing, potting, encapsulating and protective-coating applications.
TDS, SDS & Technical Documents
- DOWSIL™ 736 Heat Resistant Sealant Technical Data Sheet
- Red List free Letter — DOWSIL™ 736 Heat Resistant Sealant
- Dow AdhesiveSealant Solutions for Vehicle System Design Selection Guide
- Dow Silicone options for vehicle powertrain systems
- DOWSIL 736 One Component HI Temp Silicone Adhesive-Safety Data Sheet-EN
Technical Specifications
General Properties
Physical Properties
Mechanical Properties
Additional Information
DOWSIL™ 736 Heat Resistant Sealant
A one-part, nonslumping silicone paste for bonding, sealing, gasketing, potting, encapsulating and protective-coating applications exposed to high temperatures. The material cures at room temperature through atmospheric moisture to form a flexible rubbery solid and supports continuous operation to 260°C with intermittent exposure to 315°C.
DOWSIL™ 736 Heat Resistant Sealant is supplied as a red, ready-to-use silicone paste.
As-supplied properties
Typical values are provided for product evaluation and are not intended as guaranteed specifications.
| Property | Value | Unit | Condition or context |
|---|---|---|---|
| Composition | One-part silicone | — | Ready-to-use moisture-cure system |
| Color | Red | — | As supplied |
| Flow or slump | Nil | — | Nonslumping paste |
| Extrusion rate | 390 | g/min | 3.18 mm orifice at 90 psi |
| Specific gravity | 1.04 | — | Typical as-supplied value |
| Skin-over time | 10 | minutes | Exposed to air at 25°C and 50% relative humidity |
| Tack-free time | 17 | minutes | Exposed to air at 25°C and 50% relative humidity |
| Cure time | 24 | hours | 3 mm thickness at 25°C and 50% relative humidity |
Surface preparation, application and cure
DOWSIL™ 736 is supplied ready to use and flows from its container under pressure. Thoroughly clean and degrease applicable metal and plastic surfaces before application. Roughen rubber surfaces with sandpaper and wipe them with a suitable solvent. Apply the paste in a uniform thickness and complete tooling before skin formation begins.
Apply the sealant to properly prepared surfaces in a uniform thickness and complete tooling before skin formation.
Atmospheric moisture is required for cure. Lower humidity, thicker sections and partial confinement extend cure time, while absolute confinement may prevent complete cure. For stronger and more uniform bonds, a compatible primer or adhesion promoter may be used on surfaces other than rubber and silicone rubber. Store the product in its original unopened container at or below 32°C.
The sealant is not recommended for continuous underwater immersion where adhesion or structural bonding is required, masonry, painted-over surfaces or totally confined areas. Adhesion is limited on PTFE-coated materials, polyethylene, polypropylene and methyl methacrylate. Acetic acid released during cure may corrode sensitive metals, and some plastics may develop stress cracking; evaluate the complete substrate and cure configuration before use.
Cured and service properties
Typical cured values were measured after 72 hours at 25°C and 50% relative humidity and are not intended as guaranteed specifications.
| Property | Typical value | Unit or condition |
|---|---|---|
| Durometer hardness | 26 | Shore A points |
| Tensile strength | 350 | psi |
| Elongation | 600 | % |
| Continuous operating temperature | -65 to 260 | °C |
| Intermittent temperature exposure | 315 | °C maximum stated exposure |
Product applications
The product’s stated temperature range and nonslumping consistency support bonding and sealing applications around equipment and components exposed to elevated operating temperatures.
Supporting technical resources
Use these supporting documents to review silicone options for powertrain systems, compare adhesive-sealant choices for vehicle system design and examine supplier documentation related to material screening.
Technical support for DOWSIL™ 736
Need help evaluating DOWSIL™ 736 for a high-temperature joint, gasket, heating element or equipment assembly? Krayden can help review substrate compatibility, surface preparation, cure access, section thickness and operating-temperature requirements before application testing.
