Technical Data Sheet
QSil 557
Quantum Silicones鈥? Silicone Potting Material
Product Description
QSil 557 is a 100% silicone solids elastomer designed for electronic potting
applications. This two component system offers a hard, thermally conductive, low
modulus material that is readily repairable.
Key Features
100% solids 鈥? no solvents
鈥?
Long pot life
鈥?
Low modulus
鈥?
Good elongation
鈥?
Typical Properties
Uncatalyzed Properties 鈥淎鈥? component 鈥淏鈥? component
Viscosity, cps 6,500 6,000
Appearance Beige Black
Specific Gravity 1.24 1.24
Mix Ratio 1:1
Pot Life 150minutes* (customized cure available)
* Time to 25,000cps
Catalyzed Properties (cured 20 minutes @ 150C)
Durometer, shore A 40
Tensile, psi 400
Elongation, % 200
Tear, die B, ppi 20
100% modulus, psi 150
Young鈥檚 modulus 150
1
Electrical Properties
Dielectric Strength, V/mil 490
Dielectric Constant (1000Hz) 3.00
1 x 1014
Volume Resistivity, Ohm-cm
Mixing
Thoroughly stir both A and B components prior to mixing together.
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 1:1 mix ratio. Also use a mixing system that
will properly mix A and B components. Once mixed properly the material will have a
pot-life of > 30 minutes
Storage and Shelf Life
QSil 557 should be stored in the original unopened container at 25C (77F). It will
remain useful for a period of 12 months if stored under those conditions.
Not for Product Specification
The technical data listed herein is provided as a reference only and is not intended
as sales specifications. For sales and technical assistance or for product
recommendations, please call 1-800-852-3147.
Quantum Silicones
8021 Reycan Rd
Richmond, VA 23237
Phone (804) 271-9010 Fax (804) 271-9055
Customer Service (800)852-3147
www.quantumsilicones.com
2
|