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MBS®
Moisture Barrier Silicone

Single component, silicone elastomer coating designed to stabilize semiconductor junctions and surfaces and for the environmental protection of electronic components – used for diodes, transistors, integrated circuits, thick film and thin film microelectronic circuits modules.

FEATURES:
  • Single component self-catalyzed system- simple and economical to use
  • Unaffected by humidity
  • Excellent electrical characteristics
  • Wide operating temperature range - -65 °C to 275 °C (continuous)
  • Useful as protective coating, encapsulant or potting
MBS Moisture Barrier Silicone
Description

MBS, Moisture Barrier Silicone, is a medium viscosity translastic product specially processed from highly purified siloxane compounds. This product is particularly formulated to provide greater protection against humidity in electronic applications. MBS possesses self-catalyzing properties and cures as a single component system to form a tough protective coating impervious to moisture. Significantly, the additions of curing agents, catalysts or accelerators are not needed to effect the silicone polymerization. Furthermore, the coating shows good mechanical and electrical characteristics over a wide range of ambient conditions.

MBS is supplied at a viscosity of 60,000 cps ± 10%. Specific viscosities of 20,000 to 100,000 are available upon request.

Properties of MBS

Cured

  

Appearance

White, opaque

Viscosity @ 25 °C

60,000 cps nominal

Density @ 25 °C

1.25

Cure

15 minutes @ 125 °C (minimum)

Post Cure

4 hrs. @ 150 °C (minimum)

Shelf Life (under refrigeration)

+5 °C (40 °F)

-10 °C (15 °F)

3 months

6 months

Uncured

  

Physical Appearance

White, Flexible

Density

1.3

Durometer, (Shore A)

35-40

Tensile Strength (psi)

250

Elongation (%)

150

Operation Temp. Range °C

75° to + 300° (275° cont)

Dielectric Constant (mc)

3.5

Dielectric Strength (volts/mil)

500

Dissipation Factor (mc)

.001

Thermal Conductivity (cal/cm/sec/cm2/°C)

6 x 10-4

Volume Resistivity (ohm-cm @ 25 °C)

> 1014

Water Absorption

Nil

Bulk Resistivity (10 days @ 100% rel. humidity)

1014


APPLICATION:

MBS is recommended as a protective, moisture barrier coating for semiconductor devices and as an encapsulant for sensitive microelectronic circuits and other electronic components. MBS is applied by any convenient method and cured at 125 °C for 15 minutes followed by 4-hour cure at 150 °C. The post cure can be accelerated by heating at 250 °C for two hours or longer.