ISO 9001:2015 Quality Management System – Burlington, Ontario, Canada
SAI Global File #004008
Features and Benefits:
• Meets UL 746A – Flame Retardant
• Good thermal conductivity
• Halogen free
• Low exotherm
• Room temperature cure
• Wide service temperature range
• Excellent dielectric properties
• Extended shelf life
• Strong chemical resistance
• Superior physical and mechanical properties
• Primeless adhesion to many substrates
• Excellent durability
Applications:
MG Chemicals’ 834 series is suitable for potting and
encapsulation of delicate electronic components where
thermal management and self-extinguishing are critical.
• Transformers
• Consumers electronics
• Automotive sensors
• Power supplies
• Aerospace sensors
834B (Standard)
A balanced formula to deliver a strong potting with good thermal conductivity
• Thermal conductivity of 0.79 W/m·K
• 48 h cure time at room temperature
• 1 h working time
• 2:1 mix ratio
834HTC (High Dimensional Stability)
A potting solution with superior dimensional stability and high T
g
• UL 746A certified (File # E334302)
• Thermal conductivity of 0.94 W/m·K
• T
g
of 117 °C
• Low CTE
• 24 h cure time at room temperature
• 1.5 h working time
• 5:1 mix ratio
834FX (Flexible)
A low T
g
formula for potting delicate components going under severe thermal cycling
• Thermal conductivity of 0.61 W/m·K
• T
g
of 0.7 °C
• 48 h cure time at room temperature
• 2.5 h working time
• 1:1 mix ratio
Flame Retardant and Thermally Conductive
834 Series Two-part Epoxy Potting and Encapsulating Compounds
North America: 1-800-340-0772
Europe: +44 1663 362888
www.mgchemicals.com
Version # 19066 Printed in Canada
834 Series Two-part Epoxy Potting Comparison Chart
Available Packaging
2 Bottle Kit
834B-375ML
834FX-450ML
2 Can Kit
834HTC-900ML
834FX-1.7L
3 Pail Kit
834B-60L
3 Can Kit
834B-2.7L
834B-10.8L
834B 834FX 834HTC
UNCURED PROPERTIES
Mix ratio by volume (A:B)
2:1 1:1 5:1
Viscosity Mixture
Part A
Part B
16 200 cP
27 500 cP
2 100 cP
10 800 cP
4 560 cP
4 670 cP
10 500 cP
55 900 cP
24 000 cP
Working life @22 °C [72 °F]
1 h 2.5 h 1.5 h
Full cure @22 °C [72 °F]
72 h 48 h 24 h
Full cure @65 °C [149 °F]
2.5 h 2 h 2 h
Full cure @80 °C [176 °F]
1 h 1 h 1 h
Full cure @100 °C [212 °F]
20 min 30 min 30 min
CURED PROPERTIES
Physical Properties
Color
Black Black Black
Density
1.59 g/mL 1.64 g/mL 1.69 g/mL
Hardness
85D 88A 91D
UL 746A and UL 94V-0
Meets Meets Certified
Halogen free
Yes Yes Yes
Mechanical Properties
Tensile strength
17 N/mm
2
5.3 N/mm
2
22 N/mm
2
Compressive strength
74 N/mm
2
21 N/mm
2
123 N/mm
2
Lap shear strength (stainless steel)
8.2 N/mm
2
3.7 N/mm
2
6.7 N/mm
2
Electrical Properties
Resistivity
2.1 x 10
12
Ω·cm 7.5 x 10
11
Ω·cm 3.0 x 10
13
Ω·cm
Dielectric strength @1/8"
376 V/mil 330 V/mil 345 V/mil
Breakdown voltage @1/8"
47 kV 41.4 kV 43.1 kV
Dielectric constant @1 MHz
3.10 4.50 3.91
Dielectric dissipation @1 MHz
0.010 0.044 0.019
Thermal Properties
Thermal conductivity @25 °C [77 °F]
0.79 W/(m·K) 0.61 W/(m·K) 0.94 W/(m·K)
Specific heat capacity @25 °C [77 °F]
1.5 J/(g·K) 1.4 J/(g·K) 1.3 J/(g·K)
Glass transition temperature (T
g
)
56 °C [131 °F] 0.7 °C [33 °F] 117 °C [243 °F]
CTE prior T
g
74 ppm/°C [165 ppm/°F] 71 ppm/°C [160 ppm/°F] 34 ppm/°C [93 ppm/°F]
CTE after T
g
107 ppm/°C [225 ppm/°F] 137 ppm/°C [279 ppm/°F] 116 ppm/°C [241 ppm/°F]
Constant service temperature
-40–175 °C [-40–175 °F] -50–150 °C [-58–302 °F] -50–150 °C [-58–302 ppm/°F]
Intermittent temperature limit
-50–200 °C [-58–392 °F] -55–165 °C [-65–329 °F] -55–165 °C [-65–329 °F]