ASI 388 Electronic Grade Sealant

ASI 388 is an electronic grade silicone and is offered as a substitute for GE 162 electronic grade silicone.

ASI 388 is a one-part, moisture- curing RTV (room temperature vulcanizing) silicone sealant! adhesive that is non-slump and cures to form a tough, permanently flexible rubber.

The non-corrosive curing system of ASI 388 makes it ideally suited for protecting, sealing and insulating corrosion-sensitive electronic and electrical materials such as copper, brass, silver, etc.

ASI 388 has been specifically formulated for use in electrical/electronic

production and assembly because it:

• has good dielectric properties

• has high surface resistivity

• resists electrical tracking

• repels water to protect electrical properties

ASI 388 is a neutral-cure silicone that emits no objectionable odors during cure and is ideally suited for use in confined areas. However, adequate ventilation should be provided when ASI 388 is used in large-scale production.

ASI 388 is a 100% silicone and has

excellent resistance to

• ozone

• UV

• airborne chemicals

• temperature changes from -57 C to +204°C (-70°F to +400°F)

TYPICAL USES

ASI 388 is an excellent sealant/adhesive for many electrical and electronic applications where corrosion to

metals, particularly copper, brass, silver, etc., is a problem. Such applications include:

• lead-wire entries

• conduit terminal boxes

• component mounting

• electrical connections

• conduit ends

• splices

• cover plates

• coaxial cable connectors

• printed circuit boards

• conductor entry holes

SURFACE PREPARATION

All surfaces should be clean and dry. It is recommended that bonding surfaces be solvent wiped with oil-free solvents, such as xylol, toluol naphtha or non-flammable chlorinated solvents. Do not wipe with oil-based solvents such as Varsol. Allow surface to dry thoroughly before applying sealant.

DIRECTIONS

ASI 388 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. At conditions of 25 C (77° F) and 50% relative humidity, the sealant will skin in 15 minutes and fully cure within 48 hours (1/8 bead).

Information on this data sheet is subject to change without notice and it is therefore recommended that this information not be used for spec writing. For additional information or specific applications, contact manufacture.

Higher humidity accelerates cure. Tooling should be done before skinning takes place.

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

PRIMING

Priming of ASI 388 is normally not required for application to most substrates.

Unprimed adhesion can be readily tested by applying a small trial bead and allowing 7 days for maximum adhesion to occur.

If primer is required, contact ASl for technical assistance.

COLORS

ASI 388 is available in clear and white. Special colors are available upon request. Call for price and availability.

MILITARY SPECIFICATIONS

ASI 388 meets the requirements of

MIL 46l06 Type 1.

FDA STATUS

ASI 388 is permitted under regulations of the Food and Drug Administration where incidental food contact might be involved. FDA Regulation number is 177.2600. File No. E209770