Hybrisil

Conformal Coatings for Thin Film/Thick Film

One-part silicone, conformal protective coatings for thin film and thick film resistor networks in microelectronic circuits.

HYBRISIL – 200
High power resistor silicone coating
Elevated temperature cure
Thermal class 350 °C

HYBRISIL™
DESCRIPTION

Hybrisil conformal coating is designed to protect and stabilize thick and thin film resistor networks. The Hybrisil coatings are one-part systems, silicone based and easily applied. These silicone materials provide a low cost yet reliable process for resistor encapsulation. The need for high temperature firings with cermet encapsulations is avoided.

Hybrisil 200 is a silicone-mica filled system which cures at elevated temperature.

PROPERTIES OF HYBRISIL CONFORMAL COATINGS

Uncured HYBRISIL 200
Composition One-part silicone filled
Color Black
Viscosity (cps) 1,500
Thinner Xylene
Solids 70%
Flash Point 90 °F
Chemical Resistance Excellent
Shelf Life 6 months
Cure, Activation Heat
CURED
Bond Strength (peel lbs./in2) 125
Durometer 70 (shore D)
Dielectric Constant (1000 Hz) 4.8
Dissipation Factor (1000 Hz) .002
Volume Resistivity (ohm-cm) > 1016
Water Absorption (7 days) ASTM-D570-54T < 0.1
Temperature Rating (Continuous) -65 °C to + 250 °C
Max. Oper. Temp. 350 °C

APPLICATION:

Hybrisil conformal coating is conveniently applied by horizontal flooding technique or brushing.

Hybrisil-200 is first baked at 65 °C for 20 minutes then heated for ½ hour at 125 °C followed by a post cure of ½ hour at 220 °C.

Resistor Coatings

High Temperature Conformal Coatings

Solution type insulation coatings formulated with dielectric aluminum silicates in a special silicone base – for power resistors, capacitors and other electrical components.

RESISTOR COATING – TYPE 100
Thermal Class – 350 °C
For very high temperature applications

RESISTOR COATING – TYPE 150
Thixotropic modification of type 100
For single coat application

RESISTOR COATING – TYPE 200
Thermal class – 250 °C
For applications requiring very high adhesion and chemical resistance

RESISTOR COATING – TYPE 250
Thixotropic modification of type 200
For single coat application

FEATURES:

  • Single component systems
  • High insulation resistance
  • High reliability performance
  • Moisture resistant
  • Fire resistant

RESISTOR COATINGS
DESCRIPTION

Transene conformal resistor coatings are specially formulated from insulation materials designed to pass rigid, high reliability performance standards for military and space applications. The coatings are particularly advantageous for precision power resistors as well as for other electrical components used in high temperature applications. The coatings are fire resistant and highly protective towards moisture and ambient.

Transene Resistor Coatings contain modified, high temperature silicone resins combined with dielectric grade aluminum silicate materials. These coatings exhibit excellent insulating properties, notably high dielectric strength and high electrical resistivity. Furthermore, these characteristics are maintained at elevated temperatures- as high as 350 °C continuous. A feature of these resistor coatings is their superior adhesion.

Two basic types of resistor coatings are offered based upon their temperature rating, adhesion, quality and chemical resistance. In addition, thixotropic modification of these two types allows single coat application.

RESISTOR COATING – Type 100 was developed specifically for high temperature application; consequently it demonstrates exceptional thermal stability. Color black or green.

RESISTOR COATING – Type 150 is a thixotropic modification of type 100 to permit single coat application. Color black or green.

RESISTOR COATING – Type 200 is designed to withstand chemical attack. Its resistance to solvents is excellent while adhesion is extremely high. Color black or green.

RESISTOR COATING – Type 250 is a thixotropic modification of type 200 for single coat application. Color black or green.

PROPERTIES OF RESISTOR COATINGS

PHYSICAL PROPERTIES Type 100 and 150 Type 200 and 250
Appearance Liq Susp. Liq. Susp.
Color Black or green Black or green
Viscosity, cps 200/1300 1000/1300
Solids % by wt. 80% 80%
Sp.Gr. 1.21 blk, 1.12 grn 1.18 blk, 1.10 grn
Thinner Xylene or toluol Xylene or toluol
Flash Point (solvent) 90 °F 90 °F
Shelf Life 6 months 6 months
Chemical Resistance Good Excellent
Temperature Rating (10,000 hrs) 350 °C (cont.) 250 °C (cont.)
Temperature Cycling -65 °C to + 250 °C -65 °C to + 250 °C
Coverage/gal/mil/thickness 650 sq. ft. 650 sq. ft.
Bond Strength, peel lbs./in2 125 225
Lap Shear Strength lbs/in2 250 > 1000
ELECTRICAL PROPERTIES
Dielectric Strength (volts/mil) 700 700
Dissipation Factor @ 1 mHz. .002 .01
Dielectric Constant @ 1 mHz. 4.85 5.25
Volume Resistivity(ohm-cm) > 1016 > 1016
CURE SCHEDULE
Air Drying (also between coats) 20 min 20 min
Bake at 65 °C 20 min 20 min
Cure ½ hr. at 125 °C ½ hr at 150 °C
Post Cure ½ hr at 225 °+C ½ hr at 225 °C
Alternate Cure and Post Cure ——— 6 hrs at 135 °C

APPLICATION

Coatings can be applied by dip or roll dip. Type 100 and type 200 yield a coat thickness of about 2 mils on single application. Two or three coatings are recommended. Type 150 and 250 permit single coat application of about 7 mils, permitting greater economy and process simplification.

The coatings should be (1) air dried and baked at 65 °C for 20 minutes followed by (2) one half hour at 125 °C (or 150 °C), then (3) post cured for one-half hour at 220 °C. Alternated lower temperature cure may be used for Types 200 and 250.