Polymer Systems
Technology Limited

Advanced Engineering

Optoelectronics:
Electronics:

LS1-3252

Gels

Optically Clear Silicone Gel

DESCRIPTION

Two-part, 1:1 Mix Ratio (Part A: Part B)
1.52 refractive index for matching BK7
Cures with heat via addition-cure chemistry and will cure at room temperature

APPLICATION

For protection of sensitive photonics assemblies from mechanical shock, thermal shock, dust, and ambient atmosphere.
Low viscosity reduces voids in complex assemblies to fill in and permits time for any trapped air bubbles to float to the fluid surface and escape.
For applications requiring optically clear materials with a refractive index of 1.52 at 589 nm
For LEDs and display assembly

PROPERTIES
Typical Properties	Result
Uncured:
Appearance	Transparent
Viscosity (initial Part A and Part B mixed)	360 cP
Viscosity at 3 hours after catalyzation	< 4,000 cP
Cured: 30 minutes at 150°C (302°F)
Durometer, Type 00	25
Specific Gravity	1.07
Refractive Index, 589 nm	1.52
Moisture Absorption, % gain after 168 hour exposure at 85°C (185°F) / 85% R.H.	< 0.2 %
Cured: 24 hours at ambient temperature and humidity
Durometer, Type 000	65
Transmittance vs. Wavelength (25°C)*	See Appendix
Refractive Index vs. Wavelength (25°C)*	See Appendix
Refractive Index vs. Temperature by Wavelength*	See Appendix

Recommended Primers CF2-135 - SP-120 - SP-271

Note: Some bonding applications may require the use of a primer.
CF2-135 is recommended for most metallic substrates, some plastics and when cure inhibition is observed on substrate.
SP-120 is recommended for PPA and SP-271 is recommended for PMMA.