XL-389 FRLV FLAME RETARDANT ENCAPSULANT

FLEXIBLE, THERMALLY CONDUCTIVE, FLAME RETARDANT EPOXY ENCAPSULANT AND POTTING COMPOUND

PROTAVIC XL-389 FRLV is a new, flexible, low viscosity thermally conductive epoxy potting and encapsulating compound which will pass UL-94V0 flammability requirements and has been specifically designed for potting transformers and power supplies where minimal change in inductance after potting is required. XL-389 FRLV has found extensive use in potting state of the art power components such as AC Input products, DC Input products, attenuator modules, module evaluation boards, military power components, as well as conventional power supplies. XL-389 FRLV’s low viscosity allows it to penetrate difficult to pot areas.

Easy Mix Ratio, Flexible Cure Schedule XL-389 FRLV has an easy, one-to-one (1-1) mix ratio, with a long working life of 4 hours at room temperature, and the ability to be cured in 48 hours at room temperature or 4 hrs at 65° C.

Cure Schedule

Hours ° C
4 65
48 25


The outstanding properties of XL-389 FRLV are high adhesion, room temperature or heat accelerated cure schedule, forgiving one-to-one (1-1) mix ratio, long working life, repairability, thermal conductivity, and flexibility, all combined with a very low glass transition temperature which makes it suitable for military and low-temperature applications. Additionally, XL-389 FRLV is lower in cost than Silicone RTV’s and does not produce corrosive by products such as acetic acid during cure.

XL-389 FRLV has proven to be an excellent choice in power component potting applications where inductance drops after potting need to be less than 5% compared to power component inductance before potting.

Typical Properties of Uncured XL-389 FRLV

Product Activator Base Mixture
Color Gray Gray Gray
Form Paste Paste Paste
Specific Gravity 2.1 2.2 2.15
Viscosity (25°/25° C)
Brookfield 5 RPM
Brookfield 20 RPM
33,200
17,500
10,800
11,400
20-25,000
15-20,000
Flash Point, ° C 87 N/A


Typical Properties of Cured XL-389 FRLV
Should not be used for specification purposes

Mechanical
Form Tough, Rubbery
Short Durometer, A 85 +/- 10
Modulus of Elasticity, psi 3075
Tensile Lap Shear (Al- Al), psi 300
Thermal
Operating Range °C, continuous -55 to 150
Intermittent To 177
Expansion Coefficient, 106 to °C-1 60 – 65
Thermal Conductivity, Btu-in-hr-1-ft-2-°F-1 3.83
Glass Transition Temperature, °C -34
Electrical
Dielectric Strength, volts/mil 350
Volume Resistivity, ohm-cm 1 x 1014
Dielectric Constant, 1000 Hz 4.7


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Technical information and recommendations made by Protavic America, Inc. concerning products and uses or applications thereof, are based on reliable laboratory tests and are believed to be accurate. No warranty, however, is expressed or implied, nor is any warranty expressed or implied as to results to be obtained from use of said materials, whether used singly or in combination with other products. No statements made are to be construed as constituting a license under any existing patent.