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Description for Dow 736 Heat Resistant Sealant
One-part; non-slumping RTV paste, good resistance to weathering, moisture and excellent resistance to high temperature; cures to a tough rubbery solid.Brand Dowsil Application Type Seal, Aerospace gasketing 1 Part or 2 Part 1-Part Material Form Paste Substrate Metals, Plastics, Rubber Industry Bag filters on smoke stacks Manufacturer Dow Chemistry Silicone Application Method Spatula, Wooden paddle Cure Method Moisture Cure Temperature (°C) 25, 25, 25 Cure Time (min) 1,440, 4,320 Viscosity (cPs) Controlled, Non-sag, NonFlow Color Red High Temperature Resistance (°C) 260, 315 Low Temperature Resistance (°C) -65 Key Specifications FDA (U.S. Food & Drug Administration) and/or CFIA (Canadian Food Inspection Agency): FDA 21 CFR177.2600, Mil-Spec (United States Military Standard): MIL-A-46106A -
Technical Data for Dow 736 Heat Resistant Sealant
Overview
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Application Type
- Gasketing - Aerospace gasketing
- Sealant - Seal
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1 Part or 2 Part
- 1-Part
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Material Form
- Paste
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Industry
- Industrial - Heating elements, Industrial ovens
- Filters - Bag filters on smoke stacks
- Appliances - Oven belts
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Chemistry
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Application Method
- Spatula/Trowel - Spatula, Wooden paddle
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Cure Method
- Moisture / Condensation Cure - Moisture
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Color
- Red
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Key Specifications
- FDA (U.S. Food & Drug Administration) and/or CFIA (Canadian Food Inspection Agency) : 177.2600 - FDA 21 CFR177.2600
- Mil-Spec (United States Military Standard) : A-46106A - MIL-A-46106A
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Brand
- Dowsil
Specifications
Cure Specs
Cure Temperature (°C) 25, 25, 25 Test Method Cure Time (min) 1,440, 4,320 Test Method Viscosity (cPs) Controlled, Non-sag, NonFlow Tack Free Time (min) 17 Test Method Work / Pot Time (min) 10 Test Method Bond Strength
Tensile Strength (psi) 350 Test Method Material Resistance
Environmental Resistance Good High Temperature Resistance (°C) 260, 315 Low Temperature Resistance (°C) -65 Moisture/Humidity Resistance Moisture/Humidity Resistance Hardness
Shore A Hardness 26 Test Method Elongation (%) 600 Test Method Other Properties
Specific Gravity 1.040 Business Information
Shelf Life Details When stored in its original, unopened container below 32°C (90°F), Dow Corning 736 Heat Resistant Sealant has a shelf life of 30 months from date of manufacture. Refer to product packaging for “Use By” date. Shelf Life Temperature (°F) <90 Shelf Life Type from date of manufacture Shelf Life (mon) 30 Not Good For
Don't Use With concrete, brick, Mortar or other masonry surfaces, surfaces to be painted, impregnated woods or oil-based caulks that bleed oils, polyethylene, polypropylene, methylmethacrylate, copper, brass, zinc, carbon steel, galvanized iron, magnesium, On some plastics; may cause stress cracks, For continuous underwater immersion where adhesion or structural bonding is required, On Teflon coated materials, Sealant -
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Best Practices for Dow 736 Heat Resistant Sealant
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Surface Preparation
Thoroughly clean and degrease metal and plastic surfaces using Dow Corning® brand OS (Ozone Safe) Fluids or another suitable solvent. Rubber surfaces should be roughened with sandpaper, then wiped with Dow Corning OS Fluids or another suitable solvent. Follow all precautions given on the solvent container label.
For stronger, more uniform bonds, apply a thin film of Dow Corning® 1200 Prime Coat or Dow Corning® P5200 Adhesion Promoter to all surfaces except rubber and silicone rubber. Allow to air-dry for 30 to 45 minutes at room temperature. (Full instructions are provided with the prime coat.)
Note: Dow Corning 1200 Prime Coat or Dow Corning P5200 Adhesion Promoter are flammable and are not suitable for use in food contact applications. Keep away from heat, sparks and open flames. Use only with adequate ventilation.
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Application
Dow Corning 736 Heat Resistant Sealant is supplied ready to use. Under pressure, it flows readily from its container. The paste-like consistency makes it easy to work
a spatula or wooden paddle can be used for tooling the surface.
Apply Dow Corning 736 Heat Resistant Sealant to the prepared surface in a uniform thickness. In those cases where the sealant is to be used between two surfaces, put the second surface in place, using enough pressure to displace the air but not the sealant.
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Curing
Cure time is affected by relative humidity, degree of confinement and cross-sectional thickness of the sealant. Sections up to 3-mm [1/8-inch] thick become rubbery solids in about 24 hours at 25°C (77°F) and 50 percent relative humidity. Less moisture content reduces the time required slightly. In 24 hours, sections up to 3-mm [1/8-inch] thick cure to a rubber.
In applications where Dow Corning 736 Heat Resistant Sealant may be partially or totally confined during cure, the time required for proper cure is generally lengthened by the degree of confinement. It is possible, with absolute confinement, that cure will not be completed. Metal-to-metal bonds should not overlap more than one inch. Every application involving confinement during cure should be thoroughly tested before use. Curing time increases with the thickness of the sealant.
NOTE: The odor given off during cure is due to the liberation of acetic acid. This odor disappears as the cure progresses and is not detectable after the cure is complete.
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Testing
On some plastics
may cause stress cracks
test before use
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Comparable Materials for Dow 736 Heat Resistant Sealant
Spec Engine® Results
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Dowsil 730 FS Solvent Resistant Sealant(Dow)One-component fluorosilicone adhesive/sealant, Cures at room temperature, Non-sag, paste consistency, For assembling and/or repairing of fuel systems and tanks.
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TB5211(Threebond)A single-component, non-slumping paste, solvent free and non-acid RTV (room temperature vulcanizing) silicone sealant which has been developed for civil engineering, construction and industrial use.
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Cure Temperature Test Methods
| Cure Temperature | Cure Time Test Method |
|---|---|
| 25°C | Exposed to air, 25°C (77°F) and 50 percent RH |
| 25°C | Exposed to air, 25°C 77°F and 50 percent RH, 3-mm [1/8-inch] thickness |
| 25°C | After 72 hours at 25°C (77°F) and 50 percent RH |
Cure Time Test Methods
| Cure Time | Test Method |
|---|---|
| 1,440 min | Exposed to air, 25°C 77°F and 50 percent RH, 3-mm [1/8-inch] thickness |
| 4,320 min | After 72 hours at 25°C (77°F) and 50 percent RH |
Tack Free Time Test Methods
| Tack Free Time | Tack Free Temperature | Test Method |
|---|---|---|
| 17 min | 25°C | Exposed to air, 25°C 77°F and 50 percent RH |
Work / Pot Time Test Methods
| Work / Pot Time | Test Method | Temperature |
|---|---|---|
| 10 min | Exposed to air, 25°C 77°F and 50 percent RH | 25°C |
Tensile Strength Test Methods
| Tensile Strength | Cure Time | Cure Temperature | Cure Humidity |
|---|---|---|---|
| 350 psi | 4,320 min | 25°C | 50(%) RH |
Elongation Test Methods
| Elongation | Test Method |
|---|---|
| 600 % | As Cured - After 72 hours at 25°C (77°F) and 50 percent RH |
Shore A Hardness Test Methods
| Shore A Hardness | Shore Hardness Test Method | Hardness Temperature |
|---|---|---|
| 26 | As Cured - After 72 hours at 25°C (77°F) and 50 percent RH | 25°C |
