ASI 388

ELECTRONIC GRADE RTV SILICONE

BONDS, SEALS, ADHERES & ENCAPSULATES

ASI 388 Electronic Grade RTV Silicone is a one part, moisture cure sealant that cures to form a tough, durable, flexible rubber that is deal for bonding, sealing, encapsulating and protecting electronic parts.

Once cured, ASI 388 will withstand a constant temperature range of -70°F to 400°F and will resist some chemicals depending on duration, contact and the type of chemical. ASI 388 bonds to a wide variety of substrates which makes it ideal for protection against moisture and other external variables. ASI 388 exhibits consistent electrical properties even when subjected to environmental changes in temperature, humidity, etc., making it a good insulator for electronic components.

388-Electronic-Grade-RTV-Silicone

Features

Non-Corrosive, Electronic Grade
Heat & Cold Resistant
Excellent Electrical Properties
Long-Lasting Durability
Resistant To Some Chemicals
Good Stress Relieving Properties
Excellent For Bonding, Sealing, or Encapsulating
Advanced Adhesion To Various Substrates

Physical properties

Physical Properties	Test Method	Result
Viscosity	ASI Test Method	1,000,000 cps (Spindle 7, 4 rpm)
Skin Formation Time	ASI Test Method	20 minutes (70°F, 50% RH)
Density	ASTM D1475	8.5 lbs./gal
Hardness	ASTM C661	30 (Shore A)
Modulus 100%	ASTM D412	0.37 MPa
Tensile Strength	ASTM D412	300 psi
Elongation at Break	ASTM D412	600%
Application Temperature	ASI Test Method	-35°F to 150°F
Gun Grade	ASI Test Method	Pass (Non-Slump)
QUV Testing	ASTM G154	Pass (10,000 hrs.)
Service Temperature	ASI Test Method	-70°F to 400°F
Dielectric Strength	ASTM D149	500 (Volts/Mil)
Volume Resistivity	ASTM D257	3x10**15
Dielectric Constant 50Hz	ASTM D150	3
Dielectric Factor 50Hz	ASTM D150	5x10**-3
Typical Cure Rate	ASI Test Method	24 hrs. (1/8" bead)

Strength will start to develop immediately and continue increasing for 7 days after application. ASI recommends testing strength and adhesion on the 7th day. ASI 388 suggested application temperature range: -35°F to 150°F. ASI 388 can be used at temperatures higher than 400°F for intermittent periods. Testing should be done to confirm temperature requirements are met.

Information on this data sheet can change without notice and it is therefore not recommended that these figures be used in spec writing. If you have any questions contact manufacturer’s sales and technical service department.

Conforms / Meets / Exceeds

UL Recognized
VOC Compliant (21 grams/liter ASTM D2369)

Common Substrates

Glass
Most Metals
Most Fiberglass
Most Wood Types
Aluminum
Porous Surfaces
Vinyl
Rubber
Natural & Synthetic Fiber
Most Painted Surfaces
Some Plastics

Common Applications

Sealing Lead Wire Entries
Waterproofing Electronics
Component Mounting
Adhesive Use Around Electronics
Sealing Electronic Assemblies

Speak with a sales engineer to discuss ASI 388 or any of our other products or manufacturing services! Use our contact form or call 800-325-7040 now.