Product Data Sheet
QSil 431
Silicone Potting Material
Product Description
QSil 431 is a 100% silicone solids elastomer designed for electronic potting
applications. This two component system offers a fast curing, low modulus material.
Key Features
100% solids 鈥? no solvents
鈥?
Fast Cure
鈥?
Low modulus
鈥?
Good primerless adhesion to a variety of substrates
鈥?
Typical Properties
Uncatalyzed Properties
鈥淎鈥? component 鈥淏鈥? component
Viscosity, cps 5,000 Slightly Thixotropic
Appearance Beige Black
Specific Gravity 1.13 1.08
Mix Ratio(A:B) 10:1
Pot Life 5-10 minutes
Catalyzed Properties (cured 24 hours @ 25C)
Durometer, Shore A 22
Adhesion to Aluminum Cohesive Failure
Thermal conductivity**
W/mK 0.25
Adhesion 鈥? Ensure that the surface is clean and free of any foreign substances. For
best results, clean the surface of the substrate to be adhered to with a suitable solvent.
Mixing
Thoroughly stir both A and B components prior to mixing together. Use of
mixing equipment is recommended for this grade.
Mixing by hand
Combine equal parts of A and B component by weight and stir until
completely mixed. Use care when mixing to minimize air entrapment.
Mixing and dispensing with automatic equipment
Use properly ratioed equipment for a 10:1 mix ratio by weight. Also use a
mixing system that will properly mix A and B components. Once mixed
properly the material will have a pot life of approximately 10 minutes.
Storage and Shelf Life
QSil 431 should be stored in the original unopened container at 25C (77F). It
will remain useful for a period of 6 months if stored under those conditions.
Not for Product Specification
The technical data listed herein are provided as a reference only and
are not intended as sales specifications. For sales and technical assistance or
for product recommendations, please call 1-866-303-LEAP
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