Surface Mount Technology Potting

The increased use of Surface Mount Technology (SMT) in potted electrical and electronic devices requires a new level of potting performance to reduce mechanical stresses on weak adhesive connections inherent to SMT construction. The proper selection of a potting compound is critical to successfully engineering product designs that incorporate SMT.

At EFI Polymers, we have worked in-step with technology to adapt and evolve new polymer systems to seal and protect your sensitive SMT electronics from the harshest environmental conditions. Our experience with potting hundreds of thousands of SMT electronics has shown us that in order for these potting materials to work across a wide range of temperatures they typically meet the following criteria:

  • Low elastic modulus: allows the potting material to absorb energy from thermal cycling without cracking or breaking delicate parts.
  • Ideal CTE Values: with coefficient of thermal expansion (CTE) values that match up well with your electronics, our materials expand and contract with your components, protecting them across a wide range of temperatures.
  • Extremely low Tg: With a low Tg (glass transition temperature) our materials will retain their low modulus below temperatures of -40⁰C
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System ID Comments Mix Ratio
by Volume
Mixed Viscosity
at 77F
Mixed Density
Lb/Gal
Mixed Color Gel Time Gel Time
Mass
Gel Time
Temp
Geltimemin Hardness
Shore Type
Hardness
Value
30222/40020
low-cost, excellent thermal cycling work-horse urethane
100:25
6000
12.0
Black
60
200
77
Minutes
A
15
30223/40002
flame retardant, quick setting, flexible
100:20.2
36000
12.5
Black
17
200
77
Minutes
D
50
30211/40008
high performance, excellent thermal cycling and low temperature performance, fame-retardant
100:25
4600
11.7
Black
60
200
77
Minutes
A
65-70
30027/40002
plasticizer free, good flexibility, RF transparent
100:17.9
1250
8.0
Amber
65
150
77
Minutes
A
45-55
30020/40018
RF-Transparent, excellent air release
100:45.9
500
8.5
Yellow
49
100
77
Minutes
A
60-65
30027/40018
RF Transparent, excellent for use with SMT
100:19.5
2300
8.2
Amber
85
150
77
Minutes
A
50-60
30017/40014
good clarity, RF Transparent, re-enterable
100:100
980
8.0
Amber
13
200
77
Minutes
A
10-15
30009/40002
flexible, plasticizer free, great choice for sensitive electronics
100:18.2
1250
8.0
Amber
15
150
77
Minutes
A
55
System ID Comments Mix Ratio
by Volume
Mixed Viscosity
at 77F
Mixed Density
Lb/Gal
Mixed Color Gel Time Gel Time
Mass
30222/40020
low-cost, excellent thermal cycling work-horse urethane
100:25
6000
12.0
Black
60
200
30223/40002
flame retardant, quick setting, flexible
100:20.2
36000
12.5
Black
17
200
30211/40008
high performance, excellent thermal cycling and low temperature performance, fame-retardant
100:25
4600
11.7
Black
60
200
30027/40002
plasticizer free, good flexibility, RF transparent
100:17.9
1250
8.0
Amber
65
150
30020/40018
RF-Transparent, excellent air release
100:45.9
500
8.5
Yellow
49
100
30027/40018
RF Transparent, excellent for use with SMT
100:19.5
2300
8.2
Amber
85
150
30017/40014
good clarity, RF Transparent, re-enterable
100:100
980
8.0
Amber
13
200
30009/40002
flexible, plasticizer free, great choice for sensitive electronics
100:18.2
1250
8.0
Amber
15
150