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Master Bond adhesives

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Lord Adhesives Thermoset™ UR-329 Two Component Urethane Potting Compound
Categories: Polymer; Adhesive; Thermoset; Polyurethane, TS; Thermoset Polyurethane, Adhesive

Material Notes: Lord UR-329 is a flexible, two-component, room temperature curing, urethane, encapsulating compound. UR-329 maintains low hardness and modulus over a wide temperature range, which imparts minimal stress on delicate electronic components. UR-329 is a filled system, which enhances its ability to dissipate heat. It is often suitable in applications operating up to 130°C. UR-329 also exhibits excellent thermal shock resistance, very good electrical properties and good adhesion to a variety of materials.

All information provided by Lord.

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Physical PropertiesOriginal ValueComments
Water Absorption 0.16 %
@Temperature 25.0 °C,
Time 86400 sec
ASTM D570
Loss On Ignition <= 0.10 %
@Temperature 125 °C,
Time 605000 sec
Viscosity 60 cP
@Temperature 25.0 °C
Hardener; STM 1
 4400 cP
@Temperature 25.0 °C
Mixed; STM 1
 11000 cP
@Temperature 25.0 °C
Resin; STM 1
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore A 25 - 30ASTM D2240
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity 1.06e+15 ohm-cmASTM D257
Dielectric Constant 4.4
@Frequency 1e+6 Hz,
Temperature 25.0 °C
ASTM D150
Dielectric Strength >= 500 V/milASTM D149
Dissipation Factor 0.0448
@Frequency 1e+6 Hz,
Temperature 25.0 °C
ASTM D150
 
Thermal PropertiesOriginal ValueComments
CTE, linear 191.7 µm/m-°CASTM D3386
Thermal Conductivity 0.300 W/m-K
Maximum Service Temperature, Air 130 °C
Glass Transition Temp, Tg -68.0 °CASTM D3386
 
Processing PropertiesOriginal ValueComments
Cure Time 3.00 - 4.00 hour
@Temperature 66.0 °C
Full
 24.0 hour
@Temperature 25.0 °C
Initial
 72.0 - 96.0 hour
@Temperature 25.0 °C
Full
Pot Life 60 - 90 min
@Temperature 25.0 °C
Gel Time 60.0 min
@Temperature 66.0 °C
Shelf Life 6.00 Month
@Temperature 25.0 °C
 
Descriptive Properties
AppearanceAmber (w/fluorescent yellow die)Hardener
 BlackMixed
 BlackResin
Mix Ratio100:15by weight
 5:1by volume

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