Dow Dowsil Hi-Temp Sealant

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Description for Dow Dowsil Hi-Temp Sealant

A one-part, acetoxy-cure silicone sealant that cures to a tough, rubbery solid at room temperature on exposure to water vapor in the air. It forms a long-lasting, water-resistant seal.

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Brand	Dowsil
Chemical Resistance	Chemical Resistance: Fluid Resistance: Water-resistant
Application Type	Bond, Sealant
1 Part or 2 Part	1-Part
Material Form	Paste
Substrate	Plywood
Industry	Sealing flanged pipe joints, Sealing windows in oven doors, Bag filters on smoke stacks, Sealing access doors joints, Sealing plywood drying oven doors, Sealing access doors joints, Sealing flanged pipe joints
Manufacturer	Dow
Chemistry	Silicone
Cure Method	RTV, Moisture, Room temperature
Application Temperature (°F)	-20 to 122
Cure Time (min)	Fast, 10,080
Color	Red
High Temperature Resistance (°C)	260
Low Temperature Resistance (°C)	-40
Crack Resistance	Will not become crack
Durability	Tough
Key Specifications	ASTM (American Standard Test Method): C920: ASTM C920 Type S, Grade NS, Class 25, Use NT, G and A., TT (U.S. Federal Specification): S-00230C: Federal Specification TT-S-001543A, Type non-sag, Class A,; Federal Specificaiton TT-S-00230C, Type II, Class A, TT (U.S. Federal Specification): S-001543A: Federal Specification TT-S-001543A, Type non-sag, Class A,; Federal Specificaiton TT-S-00230C, Type II, Class A

Best Practices for Dow Dowsil Hi-Temp Sealant

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Technical Data for Dow Dowsil Hi-Temp Sealant

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Overview

Chemical Resistance
- Chemical Resistance : Fluid Resistance : Water Resistance - Water-resistant
Application Type
- Adhesive - Bond
- Sealant
1 Part or 2 Part
- 1-Part
Material Form
- Paste
Substrate
- Wood - Plywood
Industry
- Industrial - Sealing fired heaters, Other critical bonding and sealing where parts must perform at high temperatures
- Flange - Sealing flanged pipe joints
- Filters - Bag filters on smoke stacks
- Joints - Sealing access doors joints, Sealing flanged pipe joints
- Appliances - Sealing heating elements in appliances, Sealing flues on gas appliances
- Appliances Window - Sealing windows in oven doors
- Appliances Door - Sealing plywood drying oven doors
- Construction Door - Sealing access doors joints
- Other - A long-lasting
Chemistry
- Silicone
Cure Method
- Room Temperature / Air Dry - Room temperature
- Moisture / Condensation Cure - Moisture
- RTV (Room Temperature Vulcanization) - RTV
Color
- Red
Key Specifications
- ASTM (American Standard Test Method) : C920 : Class 25 - ASTM C920 Type S, Grade NS, Class 25, Use NT, G and A.
- TT (U.S. Federal Specification) : S-00230C : Class A - Federal Specification TT-S-001543A, Type non-sag, Class A,; Federal Specificaiton TT-S-00230C, Type II, Class A
- TT (U.S. Federal Specification) : S-001543A : Class A - Federal Specification TT-S-001543A, Type non-sag, Class A,; Federal Specificaiton TT-S-00230C, Type II, Class A
Brand
- Dowsil

Specifications

Cure Specs

Application Temperature (°F)	-20 to 122
Cure Time (min)	Fast, 10,080
Set Time (min)	1,440	Test Method
Tack Free Time (min)	15 to 20	Test Method

Bond Strength

General Bond Strength (psi)	High strength
Tensile Strength (psi)	325	Test Method

Material Resistance

Environmental Resistance	Resists the effects of weather extremes, Resists the effects of sunlight
High Temperature Resistance (°C)	260	Test Method
Low Temperature Resistance (°C)	-40	Test Method

Hardness

Crack Resistance	Will not become crack
Durability	Tough
Shore A Hardness	30	Test Method
Elongation (%)	5	Test Method
Flexibility	Flexible, Will not become brittle

Not Good For

Don't Use For	Structural glazing, Prolonged submersion in water or below-grade applications, Oily woods, Substrates made of methylmethacrylate, Substrates made of polycarbonate, Substrates made of polypropylene, Substrates made of polyethylene, Substrates made of polytetrafluoroethylene, Not suitable for surfaces that might bleed oils, Not suitable for surfaces that might bleed plasticizers, Not suitable for surfaces that might bleed solvents, Surfaces prone to attack by weak acids, Stone, Cement-like materials, Porous surfaces, Not for use where abrasion and physical abuse are encountered, May cause corrosion on some brass, May cause corrosion on some copper, May cause corrosion on some zinc, May cause corrosion on some zinc alloy, May cause corrosion on some containing fixtures (galvanized)

Best Practices for Dow Dowsil Hi-Temp Sealant

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1. Surface Preparation
  
  Cut out and remove all old caulk for repair applications.
  
  Clean, Two-Step. First, apply solvent to a lint-free cloth and vigorously wipe bonding surfaces to remove dirt and residues. Next, use a dry wipe to remove remaining solvent and residue for optimum cleaning. Repeat if necessary. Surfaces must be clean, dry, oil- and frost-free for best results. (Recommended solvents include isopropyl alcohol, toluene, xylene, naphtha or similar solvent.)
2. Application
  
  Install. Install back-up spacing material for better filling, especially if width exceeds ½" to maximize bonding results. Open-cell polyethylene foam backer rod can be used.
  
  Mask. Apply masking tape to areas adjacent to the joint to ensure straight bead lines. Remove masking tape immediately after tooling and before a skin forms for easy clean-up.
  
  Open cartridge. Cut snub nose above threads, reattach and cut nozzle to desired size. Insert into a caulking gun.
  
  Apply. Extrude sealant with a smooth, steady motion, and ensure complete fill of joint cavity before proceeding.
  
  Tool. Tool the sealant immediately after application and before a skin forms. Remove masking immediately after tooling.
3. Clean-Up
  
  Cleanup should start immediately after sealant has been applied/ tooled and masking tape removed.
  
  While wearing solvent-resistant gloves, wipe off excess sealant from surfaces and tools with a solvent-moistened cloth within 10 minutes of application.
Comparable Materials for Dow Dowsil Hi-Temp Sealant

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Spec Engine^® Results
- Dowsil SE 9188 RTV Adhesive(Dow)
  One-part, gray, non-flowing adhesive, fast tack free with controlled volatility and good flame resistance, Room temperature cure, no ovens required, UL 94 V-0 flammability rating,
- TSE3976-B(Momentive)
  Momentive TSE3976-B is a 1-Part Atmospheric Moisture Releases an Alcohol Vapor Paste used to Adhere Aluminum, Adhesion to many types of substrates and Glass
- SnapSil TN3005(Momentive)
  Momentive SnapSil TN3005 is a 1-Part Room temperature cure Non-flamable Paste used to Adhere Acrylic Resin (cohesive failure), Aluminum (cohesive failure) and Copper (cohesive failure)
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