ASI 388
Electronic Grade Silicone Sealant/Adhesive
DESCRIPTION
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 resistively
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). 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
ASI 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-A-46146A 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.
Underwriters Laboratories File
E209770
General Description of Material:
100% silicone
sealant furnished in the form of cartridges.
Material Modifications
- There shall be no changes in the formulation or composition of the
material unless previously cleared through Underwriters Laboratories
Inc.
Form of Shipment
- The materials are produced and shipped as finished products.
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