Home Shop Supplies Sealants Silicone SealantDow Corning 730 Solvent Resistant Sealant

Dow Corning 730 Solvent Resistant Sealant

Description
Limitations

Dow Corning 730 Solvent Resistant Sealant is a ready-to-use, solventless, nonslumping fluorosilicone rubber paste that reacts with moisture in the air to form a tough, rubbery solid. It is a fluid-resistant material that is ideally suited for use in many applications where resistance to fumes, splash, and sometimes even total immersion in fuels, oils and solvents is needed. Dow Corning 730 Solvent Resistant Sealant features good resistance to weathering, vibration, moisture, ozone, and temperature extremes. It retains its flexibility over a wide temperature range from -85 to 500�F (-65 to 260�C). Dow Corning 730 Solvent Resistant Sealant can be applied overhead or on vertical surfaces without fear of sagging, slumping or running off.

HOW TO USE

Dow Corning 730 Solvent 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.

Dow Corning 730 Solvent Resistant Sealant cures inward from the surface. At conditions of 75�F (24�C) and 50 percent relative humidity, the sealant forms a skin within 10 minutes. Tooling is not practical after the skin begins forming. Alternate periods of application and tooling may be required.

Cure
Cure time is affected by relative humidity, degree of confinement and cross-sectional thickness of the sealant. Sections up to 1/8-inch thick become rubbery solids in about 24 hours at room temperature at 50 percent relative humidity. Higher humidity reduces cure time slightly.

STORAGE AND SHELF LIFE
When stored at or below 90�F (32�C), Dow Corning 730 Solvent Resistant Sealant has a shelf life of 18 months from date of manufacture.

Since moisture in the air will cause the sealant to cure, containers should always be sealed when not in use. Once a container has been opened, a plug of cured sealant may form in the nozzle or tube tip during storage. This is easily removed and does not affect the remaining material.

Dow Corning 730 Solvent Resistant Sealant is not recommended:

For continuous underwater immersion where adhesion or structural bonding is required

On concrete, brick, mortar or other masonry surfaces

On surfaces to be painted; paints do not adhere well to sealant (paint before applying sealant)

On materials such as impregnated woods or oil-based caulks that bleed oils

In totally confined areas; atmospheric moisture is required for cure on Teflon1-coated materials, polyethylene, polypropylene or methylmethacrylate Plexiglas2); sealant will not adhere well

On or near sensitive metals such as copper, brass, zinc, carbon steel, galvanized iron or magnesium; these metals may be corroded, especially in confined cure conditions, due to the acetic acid released during the cure

With solvents such as acetone or ketones

Features

Dow Corning 730 Solvent Resistant Sealant is used primarily for bonding, sealing and caulking applications where resistance to the swelling effects of fuels, oils and solvents is needed. It can be used for assembling and/or repairing the fuel lines and tanks of cars, small engines, aircraft and rockets. Other potential applications include:

Sealing seams on various liquid storage tanks

Sealing aerospace and automotive fuel lines and tanks

Providing temporary patch for rubber linings exposed to corrosive conditions

Sealing pipe joints on lines carrying corrosive chemicals and solvents

Providing formed-in-place gaskets for sealing chemical compressors

Providing formed-in-place gaskets where irregular shapes and harsh conditions reject ordinary seals

Bonding or sealing components exposed to moisture, vibration, shock, certain fuels, oils and solvents for long periods of time

Providing formed-in-place gaskets for sealing insulators and entrance ports on fluid-filled distribution transformers

Specifications

Typical Properties
As Supplied
	Color	White
*CTM 0097**	Specific Gravity at 77�F (25�C)	1.40
CTM 0364	Extrusion Rate, 1/8-inch orifice at 90 psi, g/minute	250
CTM 0098	Skin-Over Time, minutes	10
CTM 0095	Tack-Free Time, minutes	25
Physical Properties � As Cured 7 Days at 77�F (25�C) and 50% RH
CTM 0099	Durometer Hardness, Shore A, points	40
CTM 0137A	Tensile Strength, psi	300
CTM 0137A	Elongation, percent	200
CTM 1112	Tear Strength, ppi	27
CTM 0293	Peel Strength, Aluminum Alloy Alclad 2024T3, with Dow Corning � 1200 RTV Prime Coat, ppi	15
Electrical Properties � As Cured 7 Days at 77�F (25�C) and 50% RH
	Arc Resistance, seconds	124
CTM 0114	Dielectric Strength, volts/mil	331
CTM 1139	Dielectric Constant, 100 kHz	5.5
CTM 1139	Dissipation Factor, 100 kHz	0.0043
CTM 0313	Volume Resistivity, ohm cm	2.1 x 1013
	Repairability	Excellent

*CTMs (Corporate Test Methods) correspond to standard ASTM tests in most instances. Copies of CTMs are available upon request.

Dow Corning 730 Solvent Resistant Sealant

Features

Specifications

Hazmat Item Details