ASI 505

Industrial Self-Leveling Silicone

ASI 505 Industrial Self-Leveling Silicone Sealant is a one-component, RTV (room temperature vulcanizing), free-flowing sealant designed for a variety of potting, coating and sealing applications and cures to form a tough high modulus rubber.

ASI 505 has excellent unprimed adhesion to a very wide range of substrates, including metals, glass, most woods, ceramics and many plastics.

Because ASI 505 is a 100% silicone sealant, it resists weathering, moisture, vibration, ozone, ultraviolet and temperature extremes. In addition, it stays flexible from -57°C to +204°C (-70 F to +400°F).


ASI 505 is primarily used in applications where a flowable, self-leveling silicone sealant is required to fill small gaps or voids. Applications include potting electrical terminals, coating electrical devices and bonding and sealing electrical insulation.


ASI 505 is ready to use and requires no mixing or additives. The cure mechanism begins as soon as the sealant comes in contact with the air. Uncured sealant will flow until a skin is formed.

At conditions of 25°C (77°F) and 50% relative humidity, the sealant will skin in 15 minutes and cure within 24 hours. Higher humidity accelerates cure.

In applications where partial or total confinement of sealant is prevalent, the time required for proper cure is generally lengthened by the degree of confinement.



All surfaces should be clean and dry. It is recommended that bonding surfaces be solvent wiped with naphtha, ketone or chlorinated solvent. Suitable solvents would include xylol, toluol and mineral spirits. Do not solvent wipe with alcohols or oil-containing solvents such as Varsol. Allow surface to dry thoroughly before applying sealant.


ASI 505 releases small amounts of acetic acid during cure. Adequate ventilation should be provided with extensive use of this sealant. On direct contact, uncured sealant may irritate eyes. Flush eyes well with water and call physician. Avoid prolonged contact with skin.



Priming for ASI 505 is normally not required for applications to most substrates. Unprimed adhesion can be readily tested by applying a small trial bead and allowing 7 days for maximum adhesion to occur.


ASI 505 should not be applied to surfaces that will be painted. Painting over sealant is not recommended because the paint film does not stretch with the extension of the sealant and the adhesion of paint to the ASI 505 is not adequate.


ASI 505 meets the requirements of

MIL-A-46lO6A Type II.


Available colors for ASI 505 are clear, black and white. Special colors are available upon request. Call for price and availability.


ASI warrants only that its products will meet its specifications. ASI shall in no event be liable for incidental or consequential damages. Except as expressly stipulated, ASI’s liability expressed or implied, is limited to the stated selling price of any defective goods.



About American Sealants, Inc.

Since 1987 American Sealants has become a recognized and trusted manufacturer, supplier and packager for some of the biggest brand name adhesive and industrial companies in the United States. American Sealants Inc. has grown due to its manufacturing capabilities, core values, and quality control processes. As a leader in the industry, our experienced customer service and technical team are here to ensure your satisfaction. You can be assured that you are receiving a quality product. We do not cut corners to provide cost savings – rather we offer a high performing product at a competitive price through our capabilities and processes. If you do not see something listed on our website, please do not hesitate to call and ask. With our experience we can help you get moving in the right direction.