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
1 Part or 2 Part
- 1 Part or 2 Part - 1 Part
- Dispenser - Handguns, Power-operated guns
- Spatula/Trowel - Knife blade, Spatula
- Room Temperature / Air Dry - Room temperature cure
- Mil-Spec (United States Military Standard): S-7502 - MIL-S-7502 Jig
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
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
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
Shore A Hardness 43, 37 Test Method Elongation (%) 375, 255 Test Method Flexibility Flexible, Tough
% Solids (%) 97 Test Method Density (g/cm³) 0.002 Test Method
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
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.
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.
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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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
|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
|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|