Dow Dowsil Q4-2817 Fluorosilicone Sealant

Dow Dowsil Q4-2817 Fluorosilicone Sealant Datasheet
  • Description for Dow Dowsil Q4-2817 Fluorosilicone Sealant

    ▪ High strength ▪ Retains its properties under exposure to fuels, oils and solvents ▪ Excellent adhesion and bond strength to most materials ▪ Resistant to weathering, moisture and ozone<br/>

    *See Terms of Use Below

    Brand Dowsil
    Application Type Bond, Coat, Sealant
    1 Part or 2 Part 1 Part
    Material Form Paste, Elastomer
    Substrate Epoxy, Phenolic, Glass, Aluminium, Titanium, Silicone resin laminates, Polyester, Cured silicone rubber, Stainless Steel, Metals
    Industry Components, Aerospace, E-Mobility Solutions, Aircraft fuel tanks, Aircraft
    Manufacturer Dow
    Chemistry Plastic: Silicone: Fluorosilicone, Solventless
    Application Method Knife blade, Spatula
    Cure Method Moisture, Room temperature cure
    Cure Temperature (°C) 20 to 25, 25
    Cure Time (min) 20,160
    Color Red
    Ozone Resistance Resistant to ozone
    Chemical Resistance Exposure to fuels, Exposure to oils
    Relative Solvent Resistance Chemical Resistance: Exposure to solvents
    High Temperature Resistance (°C) 260
    Low Temperature Resistance (°C) -55
    Density (g/cm³) 0.002
    Key Specifications Mil-Spec (United States Military Standard): MIL-S-7502 Jig
  • Technical Data for Dow Dowsil Q4-2817 Fluorosilicone Sealant

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Elastomer
      • Paste
    • Substrate
    • Industry
    • Chemistry
    • Application Method
      • Dispenser - Handguns, Power-operated guns
      • Brush
      • Spray
      • Spatula/Trowel - Knife blade, Spatula
      • Dip
    • Cure Method
      • Room Temperature / Air Dry - Room temperature cure
      • Moisture
    • Color
      • Red
    • Key Specifications
      • Mil-Spec (United States Military Standard): S-7502 - MIL-S-7502 Jig
    • Brand
      • Dowsil
    Specifications
    Cure Specs
    Cure Temperature (°C) 20 to 25, 25 Test Method
    Cure Time (min) 20,160 Test Method
    Set Time (min) 7,200 Test Method
    Tack Free Time (min) 40 Test Method
    Work / Pot Time (min) 11, <0.25 Test Method
    Thixotropic Thixotropic
    Bond Strength
    General Bond Strength (psi) High
    Peel Strength (piw) 10.5 (kN/m), 6.3 (kN/m) Test Method
    Tear Strength (piw) 15 (kN/m) Test Method
    Tensile Strength (psi) 4.5 (Mpa), 3.9 (Mpa) Test Method
    Material Resistance
    Ozone Resistance Resistant to ozone
    Chemical Resistance Exposure to fuels, Exposure to oils
    Relative Solvent Resistance Chemical Resistance: Exposure to solvents
    Environmental Resistance Resistant to weathering
    High Temperature Resistance (°C) 260
    Low Temperature Resistance (°C) -55
    Moisture/Humidity Resistance Resistant to moisture
    Hardness
    Shore A Hardness 43, 37 Test Method
    Elongation (%) 375, 255 Test Method
    Flexibility Flexible, Tough
    Other Properties
    % Solids (%) 97 Test Method
    Density (g/cm³) 0.002 Test Method
    Business Information
    Shelf Life Details When stored at or below 32°C in the original unopened containers DOWSIL™ Q4-2817 Fluorosilicone Sealant has a usable life of 12 months from the date of production.; As DOWSIL™ Q4-2817 Fluorosilicone Sealant cures by reaction with moisture in air, keep the container tightly sealed when not in use. A plug of used material may form in the tip of a tube or cartridge during storage. This is easily removed and does not affect the remaining contents.
    Shelf Life Temperature (°F) <90
    Shelf Life Type From the date of production
    Shelf Life (mon) 12
  • Best Practices for Dow Dowsil Q4-2817 Fluorosilicone Sealant

    *See Terms of Use Below

    1. Surface Preparation

      DOWSIL™ Q4-2817 Fluorosilicone Sealant should always be applied to clean, dry surfaces. A satisfactory bond will usually be formed without using a primer on degreased surfaces. However, for maximum adhesion use of DOWSIL™ 1200 OS Primer is recommended. For best results: Clean the surface with a chlorinated solvent (see Handling Precautions) and a slightly abrasive pad or a coarse lint-free cloth.

      Rinse cleaned surface with acetone or methyl ethyl ketone.

      Apply a thin coat of primer by dipping, brushing or spraying.

      Allow the primer to dry for at least 1 hour, according to relative humidity.

      Silicone rubber surfaces should not normally be primed, but only roughened slightly with abrasive paper and rinsed with acetone. In thin sections, a primer may be needed.

    2. Application

      DOWSIL™ Q4-2817 Fluorosilicone Sealant is supplied in a polyethylene cartridge which can be used with handguns or power-operated guns. A source list for this equipment is available upon request.

      Once extruded, DOWSIL™ Q4-2817 Fluorosilicone Sealant (see Handling Precautions) sealant will not flow or slump and can be easily tooled with a spatula or knife blade before it starts to skin over.

      DOWSIL™ Q4-2817 Fluorosilicone Sealant may be dispersed in methyl ethyl ketone and applied by brushing, dipping or spraying.

      If DOWSIL™ Q4-2817 Fluorosilicone Sealant is being used as an adhesive between two surfaces, it should be applied to one surface in a uniform thickness of 0.25–0.75 mm. The other surface should be put in place and enough pressure exerted to displace the air and assure uniform contact between adhesive and both surfaces. Best adhesion is obtained with a 0.25–0.75 mm glue line.

    3. Curing

      DOWSIL™ Q4-2817 Fluorosilicone Sealant begins curing on exposure to moisture in the air. It will skin over in 15 minutes or less at ordinary room temperature. Skin-over time may be reduced under conditions of high temperature and humidity. The material beneath the "skin" continues to cure, and sections up to 3 mm thick become a rubbery solid in about 5 days. Curing time increases as the thickness of the sealant increases and also as the degree of confinement increases.

      Absolute confinement can prevent cure and cause inferior adhesion.

      Every application involving confinement during cure should be thoroughly tested before commercialization. Inadequate cure can result in a softening of the sealant at elevated temperatures.

      If adhesion fails to develop due to confinement or excessive sealant thickness, a layer of dispersed sealant in methyl ethyl ketone should be applied and allowed to cure completely before applying sealant.

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    *See Terms of Use Below

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
20 to 25°C
25°C 50% relative humidity, Full Cure
Cure Time Test Methods
Cure Time Test Method
20,160 min 50% relative humidity, Full Cure
Set Time Test Methods
Set Time Set Temperature Test Method
7,200 min 25°C 50% relative humidity
Tack Free Time Test Methods
Tack Free Time Tack Free Temperature Test Method
40 min 25°C CTM 0095, 50% relative humidity
Work / Pot Time Test Methods
Work / Pot Time Test Method Temperature
11 min CTM 0098, 50% relative humidity, Skin-over time 25°C
<0.25 min 20 to 25°C
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature Cure Humidity Test Time Test Temperature Test Method
4.5 (Mpa) 20,160 min 25°C 50 % CTM 0137A, ASTM D412
3.9 (Mpa) 20,160 min 60°C CTM 0137A, ASTM D412
Peel Strength Test Methods
Peel Strength Cure Time Cure Temperature Cure Humidity Substrate Test Time Test Temperature Test Method
10.5 (kN/m) 20,160 min 25°C 50 % CTM 0293, As cured - after 14 days at 25°C and 50% RH
6.3 (kN/m) Aluminium 20,160 min 60°C CTM 0293, As cured - after 14 days at 25°C and 50% RH, Measured on specimens cured for 14 days at standard conditions on 2024 clad aluminium treated with DOW CORNING® 1200 primer.
Tear Strength Test Methods
Tear Strength Cure Time Cure Temperature Cure Humidity Test Method
15 (kN/m) 20,160 min 25°C 50 % CTM 0159A, ASTM D624, As cured - after 14 days at 25°C and 50% RH, Die B
Elongation Test Methods
Elongation Test Method
375 % CTM 0137A, ASTM D412, after 14 days at 25°C and 50% RH, at Break
255 % CTM 0137A, ASTM D412, after exposure in jet reference fuel for 14 days at 60°C, at Break
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method Hardness Temperature
43 CTM 0099, ASTM D2240, after 14 days at 25°C and 50% RH 25°C
37 CTM 0099, ASTM D2240, after exposure in jet reference fuel for 14 days at 60°C 60°C
Density Test Methods
Density Temperature Test Method
0.002 g/cm³ 25°C CTM 0022, ASTM D792, 50% relative humidity
% Solids Test Methods
% Solids Test Method
97 % CTM 0208, after 24 hours at 70°C
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