SILICONES VS. POLYURETHANES
Posted 28 Apr 2023 11:24 | 1,662 views
Which is best for your potting application?
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While silicone potting has some advantages, polyurethanes work better in many applications. The main advantage of silicone compounds is their resistance to degradation at temperatures over 200°C, while offering a soft polymer. However, polyurethane’s thermal range can easily handle the operating temperatures of many industrial electronics, and its lower cost raw materials and application processes makes it a better option for a wider range of applications.
Why Replace Silicone Potting with Urethanes
8 ADVANTAGES OF REPLACING SILICONE POTTING WITH POLYURETHANES
1. MORE ECONOMICAL POLYMER:
lower cost of raw materials and application processes.
2. LOWER WATER VAPOR PERMEABILITY:
offers better protection of sensitive components against water migration causing
corrosion.
3. REDUCED OUTGASSING:
polyurethanes utilize different raw materials resulting in lower outgassing.
4. OPTIMAL OPERATING TEMPERATURE RANGE:
from -60°C to 150°C, with short excursions into higher temps.
5. BETTER BOND STRENGTH:
dependable adhesion to substrates and casings.
6. IMPROVED PHYSICAL ATTRIBUTES:
higher strength, elongation and abrasion resistance.
7. BETTER CHEMICAL RESISTANCE:
stands up to exposure to more chemical compounds.
8. WIDER FORMULATION LATITUDE:
polyurethanes can be formulated as soft as a silicone gel and as rigid as a highly
cross-linked epoxy.
source : epic resin
